KR20170021160A - Mobile terminal and controlling method thereof - Google Patents

Abstract

A mobile terminal including a plurality of antennas according to the present invention includes a first antenna for transmitting or receiving an electromagnetic wave in a first frequency band, a first antenna for transmitting or receiving an electromagnetic wave in a second frequency band lower than the first frequency band, A second antenna, and at least one capacitor, wherein one end of the capacitor is connected at a first point of a feed line extending from an end point of the first antenna, and the other end of the capacitor is connected to a ground plane And an RF switch connected at a second point of the feed line to supply or cut off power applied to the first antenna and the second antenna, wherein the second point is connected to the first point Is a point further separated by an integral multiple of a quarter wavelength of the electromagnetic wave in the first frequency band, It provides an emission control method that can control the power supply loss and efficiently.

Description

[0001] MOBILE TERMINAL AND CONTROLLING METHOD THEREOF [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile terminal and a control method thereof that can control a power supply loss caused by a feeder line.

A terminal can be divided into a mobile terminal (mobile / portable terminal) and a stationary terminal according to whether the terminal can be moved. The mobile terminal can be divided into a handheld terminal and a vehicle mounted terminal according to whether the user can directly carry the mobile terminal.

The functions of mobile terminals are diversified. For example, there are data and voice communication, photographing and video shooting through a camera, voice recording, music file playback through a speaker system, and outputting an image or video on a display unit. Some terminals are equipped with an electronic game play function or a multimedia player function. In particular, modern mobile terminals can receive multicast signals that provide visual content such as broadcast and video or television programs.

Such a terminal has various functions, for example, in the form of a multimedia device having multiple functions such as photographing and photographing of a moving picture, reproduction of a music or video file, reception of a game and broadcasting, etc. .

In order to support and enhance the functionality of such terminals, it may be considered to improve the structural and / or software parts of the terminal. Such a terminal includes an antenna for wireless communication with an external device, a base station, or a server. In recent years, a plurality of antennas and electronic components tend to be disposed inside a mobile terminal to provide various communication services. As the length of a signal line or a feed line for the interface between the plurality of antennas and some of the electronic components is increased, a feed loss due to radiated spurious emission (RSE) due to the signal line or the feed line is increased A problem has occurred.

The present invention is directed to solving the above-mentioned problems and other problems. It is another object of the present invention to provide a mobile terminal and a control method thereof for reducing power supply loss due to unnecessary radiation of RF power by a power supply line.

According to an aspect of the present invention, there is provided a wireless communication system including a first antenna for transmitting or receiving an electromagnetic wave in a first frequency band, a second antenna for transmitting or receiving an electromagnetic wave in a second frequency band lower than the first frequency band, A second antenna receiving at least one capacitor, wherein one end of the capacitor is connected at a first point of a feed line extending from an end point of the first antenna, and the other end of the capacitor And a RF switch connected at a second point of the feed line to supply or cut off power applied to the first antenna and the second antenna, Wherein the first and second frequency bands are separated from each other by an integer multiple of a quarter wavelength of the electromagnetic wave in the first frequency band. The.

According to one embodiment, the terminating end of the second antenna is connected to the feed line, and the at least one capacitor includes a first capacitor and a second capacitor, and one end of the first capacitor is connected to the feed- One end of the second capacitor is connected to the feed line at a point which is a half wavelength of an electromagnetic wave in the second frequency band from the second point, Lt; / RTI >

According to an embodiment of the present invention, the apparatus further includes a control unit for controlling the turn-on or turn-off operation of the RF switch, and the control unit transmits a control signal to turn off the RF switch when the mobile terminal enters a standby state .

According to one embodiment, the at least one capacitor includes first to third capacitors, and one end of each of the first to third capacitors is connected to the second point, And to the feed line at points that are an integral multiple of the 1/16 wavelength at the 1/2 wavelength.

According to an embodiment of the present invention, the switch further includes first to third switches disposed between one end of the first to third capacitors and the feeder line, and the first to third switches are turned by a switch control signal from the controller, Off or turned off.

According to an embodiment, the control unit may turn on the first switch based on the level of the monitoring signal for communication or the signal-to-interference ratio.

According to one embodiment, the control unit turns on the second switch or the third switch when the level of the signal or the signal-to-interference ratio is equal to or less than a predetermined value after the first switch is turned on .

According to an embodiment, the first frequency band may be 1710 to 2690 MHz and the second frequency band may be 699 to 849 MHz.

According to an embodiment, there is provided a matching circuit, arranged between the first antenna and the second antenna and the radiation control, for matching the respective input impedance of the first antenna and the second antenna to the characteristic impedance of the feed line, As shown in FIG.

According to one embodiment, the RF switch includes a communication module for generating, combining, separating, and processing an RF signal.

According to another aspect of the present invention, there is provided a method of detecting a spurious emission, the method comprising: comparing a loss value due to Radiated Spurious Emission (RSE) with a predetermined value; Determining which one of the first and second antennas respectively operating in a second frequency band lower than the frequency band is generated by the first antenna and, when the unwanted radiation is generated by the first antenna, And turning on a first capacitor disposed at a point which is a half wavelength of the electromagnetic wave of the first frequency band from the end of the RF switch.

According to one embodiment, there is provided a method of driving a plasma display panel, comprising: after the step of turning on the first capacitor, comparing a loss value due to sputter emission with a predetermined value; And turning on at least one of a second capacitor disposed at a point having a quarter wavelength and a third capacitor disposed at an integer multiple of the 1/16 wavelength at the 1/2 wavelength.

According to one embodiment, when the unwanted radiation is generated by the second antenna, the step of turning on the fourth capacitor disposed at a point which is a half wavelength of the electromagnetic wave in the second frequency band .

Effects of the mobile terminal and the control method according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, it is possible to reduce power supply loss due to unnecessary radiation of RF power in a high frequency band by the power supply line disposed in the mobile terminal.

In addition, according to at least one embodiment of the present invention, there is an advantage of providing an efficient control method that can reduce power supply loss due to unnecessary radiation of RF power by a feeder line in a mobile terminal having a plurality of antennas.

1 is a block diagram illustrating a mobile terminal according to the present invention.
FIGS. 2 and 3 are conceptual diagrams showing an example of a mobile terminal related to the present invention from different directions.
4 illustrates a plurality of antennas and RF switches mounted in a circuit board of a mobile terminal according to an embodiment of the present invention.
5 is a block diagram of a mobile terminal including a plurality of antennas and an RF switch in accordance with an embodiment of the present invention.
6 illustrates a plurality of antennas and RF switches mounted in a circuit board of a mobile terminal according to another embodiment of the present invention.
7 is a block diagram of a mobile terminal including a plurality of antennas and an RF switch in accordance with another embodiment of the present invention.
FIG. 8 is a flowchart showing a method for controlling unwanted radiation according to the feeding loss according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The mobile terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC A tablet PC, an ultrabook, a wearable device such as a smartwatch, a smart glass, and a head mounted display (HMD). have.

However, it will be appreciated by those skilled in the art that the configuration according to the embodiments described herein may be applied to fixed terminals such as a digital TV, a desktop computer, a digital signage, and the like, will be.

FIG. 1 is a block diagram for explaining a mobile terminal according to the present invention, and FIGS. 2 and 3 are conceptual diagrams illustrating an example of a mobile terminal according to the present invention from different directions.

The mobile terminal 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, a control unit 180, ), And the like. The components shown in FIG. 1 are not essential for implementing a mobile terminal, so that the mobile terminal described herein may have more or fewer components than the components listed above.

The wireless communication unit 110 may be connected between the mobile terminal 100 and the wireless communication system or between the mobile terminal 100 and another mobile terminal 100 or between the mobile terminal 100 and the external server 100. [ Lt; RTI ID = 0.0 > wireless < / RTI > In addition, the wireless communication unit 110 may include one or more modules for connecting the mobile terminal 100 to one or more networks.

The wireless communication unit 110 may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short distance communication module 114, and a location information module 115 .

The input unit 120 includes a camera 121 or an image input unit for inputting a video signal, a microphone 122 for inputting an audio signal, an audio input unit, a user input unit 123 for receiving information from a user A touch key, a mechanical key, and the like). The voice data or image data collected by the input unit 120 may be analyzed and processed by a user's control command.

The sensing unit 140 may include at least one sensor for sensing at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information. For example, the sensing unit 140 may include a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, A G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor, a finger scan sensor, an ultrasonic sensor, A microphone 226, a battery gauge, an environmental sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, A thermal sensor, a gas sensor, etc.), a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification can combine and utilize information sensed by at least two of the sensors.

The output unit 150 includes at least one of a display unit 151, an acoustic output unit 152, a haptic tip module 153, and a light output unit 154 to generate an output related to visual, auditory, can do. The display unit 151 may have a mutual layer structure with the touch sensor or may be integrally formed to realize a touch screen. The touch screen may function as a user input unit 123 that provides an input interface between the mobile terminal 100 and a user and may provide an output interface between the mobile terminal 100 and a user.

The interface unit 160 serves as a path to various types of external devices connected to the mobile terminal 100. The interface unit 160 is connected to a device having a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, And may include at least one of a port, an audio I / O port, a video I / O port, and an earphone port. In the mobile terminal 100, corresponding to the connection of the external device to the interface unit 160, it is possible to perform appropriate control related to the connected external device.

In addition, the memory 170 stores data supporting various functions of the mobile terminal 100. The memory 170 may store a plurality of application programs or applications running on the mobile terminal 100, data for operation of the mobile terminal 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. Also, at least a part of these application programs may exist on the mobile terminal 100 from the time of shipment for the basic functions (e.g., telephone call receiving function, message receiving function, and calling function) of the mobile terminal 100. Meanwhile, the application program may be stored in the memory 170, installed on the mobile terminal 100, and may be operated by the control unit 180 to perform the operation (or function) of the mobile terminal.

In addition to the operations related to the application program, the control unit 180 typically controls the overall operation of the mobile terminal 100. The control unit 180 may process or process signals, data, information, and the like input or output through the above-mentioned components, or may drive an application program stored in the memory 170 to provide or process appropriate information or functions to the user.

In addition, the controller 180 may control at least some of the components illustrated in FIG. 1 to drive an application program stored in the memory 170. FIG. In addition, the controller 180 may operate at least two of the components included in the mobile terminal 100 in combination with each other for driving the application program.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power to the components included in the mobile terminal 100. The power supply unit 190 includes a battery, which may be an internal battery or a replaceable battery.

The power supply unit 190 receives an external power supply and / or an internal power supply under the control of the controller 180 and supplies power required for operation of each component.

The power supply unit 190 may include a battery for supplying power to each component of the mobile terminal 100 and a charging unit for charging the battery by wire or wirelessly.

At least some of the components may operate in cooperation with one another to implement a method of operation, control, or control of a mobile terminal according to various embodiments described below. In addition, the operation, control, or control method of the mobile terminal may be implemented on the mobile terminal by driving at least one application program stored in the memory 170. [

Referring to FIGS. 2 and 3, the disclosed mobile terminal 100 includes a bar-shaped terminal body. However, the present invention is not limited thereto and can be applied to various structures such as a folder type, a flip type, a slide type, a swing type, and a swivel type in which a watch type, a clip type, a glass type or two or more bodies are relatively movably coupled . A description of a particular type of mobile terminal, although relevant to a particular type of mobile terminal, is generally applicable to other types of mobile terminals.

Here, the terminal body can be understood as a concept of referring to the mobile terminal 100 as at least one aggregate.

The mobile terminal 100 includes a case (for example, a frame, a housing, a cover, and the like) that forms an appearance. As shown, the mobile terminal 100 may include a front case 101 and a rear case 102. Various electronic components are disposed in the inner space formed by the combination of the front case 101 and the rear case 102. At least one middle case may be additionally disposed between the front case 101 and the rear case 102.

A display unit 151 is disposed on a front surface of the terminal body to output information. The window 151a of the display unit 151 may be mounted on the front case 101 to form a front surface of the terminal body together with the front case 101. [

In some cases, electronic components may also be mounted on the rear case 102. Electronic parts that can be mounted on the rear case 102 include detachable batteries, an identification module, a memory card, and the like. In this case, a rear cover 103 for covering the mounted electronic components can be detachably coupled to the rear case 102. Therefore, when the backside case 103 is separated from the rear case 102, the electronic parts mounted on the rear case 102 are exposed to the outside.

As shown, when the rear cover 103 is coupled to the rear case 102, a side portion of the rear case 102 can be exposed. In some cases, the rear case 102 may be completely covered by the rear case 103 during the engagement. Meanwhile, the rear case 103 may be provided with an opening for exposing the camera 121b and the sound output unit 152b to the outside.

These cases 101, 102, and 103 may be formed by injection molding of synthetic resin or may be formed of metal such as stainless steel (STS), aluminum (Al), titanium (Ti), or the like.

The mobile terminal 100 may be configured such that one case provides the internal space, unlike the above example in which a plurality of cases provide an internal space for accommodating various electronic components. In this case, a unibody mobile terminal 100 in which synthetic resin or metal is connected from the side to the rear side can be realized.

Meanwhile, the mobile terminal 100 may include a waterproof unit (not shown) for preventing water from penetrating into the terminal body. For example, the waterproof portion is provided between the window 151a and the front case 101, between the front case 101 and the rear case 102, or between the rear case 102 and the rear cover 103, And a waterproof member for sealing the inside space of the oven.

The mobile terminal 100 is provided with a display unit 151, first and second sound output units 152a and 152b, a proximity sensor 141, an illuminance sensor 142, a light output unit 154, Cameras 121a and 121b, first and second operation units 123a and 123b, a microphone 122, an interface unit 160, and the like.

2 and 3, a display unit 151, a first sound output unit 152a, a proximity sensor 141, an illuminance sensor 142, an optical output unit (not shown) A second operation unit 123b, a microphone 122 and an interface unit 160 are disposed on a side surface of the terminal body, And a mobile terminal 100 having a second sound output unit 152b and a second camera 121b disposed on a rear surface thereof.

However, these configurations are not limited to this arrangement. These configurations may be excluded or replaced as needed, or placed on different planes. For example, the first operation unit 123a may not be provided on the front surface of the terminal body, and the second sound output unit 152b may be provided on the side surface of the terminal body rather than the rear surface of the terminal body.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100 or UI (User Interface) and GUI (Graphic User Interface) information according to the execution screen information .

The display unit 151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display display, a 3D display, and an e-ink display.

In addition, the display unit 151 may exist in two or more depending on the embodiment of the mobile terminal 100. In this case, the mobile terminal 100 may be provided with a plurality of display portions spaced apart from each other or disposed integrally with one another, or may be disposed on different surfaces, respectively.

The display unit 151 may include a touch sensor that senses a touch with respect to the display unit 151 so that a control command can be received by a touch method. When a touch is made to the display unit 151, the touch sensor senses the touch, and the control unit 180 generates a control command corresponding to the touch based on the touch. The content input by the touch method may be a letter or a number, an instruction in various modes, a menu item which can be designated, and the like.

The touch sensor may be a film having a touch pattern and disposed between the window 151a and a display (not shown) on the rear surface of the window 151a, or may be a metal wire . Alternatively, the touch sensor may be formed integrally with the display. For example, the touch sensor may be disposed on a substrate of the display or inside the display.

In this way, the display unit 151 can form a touch screen together with the touch sensor. In this case, the touch screen can function as the user input unit 123 (see FIG. 1). In some cases, the touch screen may replace at least some functions of the first operation unit 123a.

The first sound output unit 152a may be implemented as a receiver for transmitting a call sound to a user's ear and the second sound output unit 152b may be implemented as a loud speaker for outputting various alarm sounds or multimedia playback sounds. ). ≪ / RTI >

The window 151a of the display unit 151 may be provided with an acoustic hole for emitting the sound generated from the first acoustic output unit 152a. However, the present invention is not limited to this, and the sound may be configured to be emitted along an assembly gap (for example, a gap between the window 151a and the front case 101) between the structures. In this case, the appearance of the mobile terminal 100 can be made more simple because the hole formed independently for the apparent acoustic output is hidden or hidden.

The optical output unit 154 is configured to output light for notifying the occurrence of an event. Examples of the event include a message reception, a call signal reception, a missed call, an alarm, a schedule notification, an email reception, and reception of information through an application. The control unit 180 may control the light output unit 154 to terminate the light output when the event confirmation of the user is detected.

The first camera 121a processes an image frame of a still image or a moving image obtained by the image sensor in the photographing mode or the video communication mode. The processed image frame can be displayed on the display unit 151 and can be stored in the memory 170. [

The first and second operation units 123a and 123b may be collectively referred to as a manipulating portion as an example of a user input unit 123 operated to receive a command for controlling the operation of the mobile terminal 100 have. The first and second operation units 123a and 123b can be employed in any manner as long as the user is in a tactile manner such as touch, push, scroll, or the like. In addition, the first and second operation units 123a and 123b may be employed in a manner that the user operates the apparatus without touching the user through a proximity touch, a hovering touch, or the like.

In this figure, the first operation unit 123a is a touch key, but the present invention is not limited thereto. For example, the first operation unit 123a may be a mechanical key or a combination of a touch key and a touch key.

The contents input by the first and second operation units 123a and 123b can be variously set. For example, the first operation unit 123a receives a command such as a menu, a home key, a cancellation, a search, and the like, and the second operation unit 123b receives a command from the first or second sound output unit 152a or 152b The size of the sound, and the change of the display unit 151 to the touch recognition mode.

On the other hand, a rear input unit (not shown) may be provided on the rear surface of the terminal body as another example of the user input unit 123. The rear input unit is operated to receive a command for controlling the operation of the mobile terminal 100, and input contents may be variously set. For example, commands such as power on / off, start, end, scrolling, and the like, the size adjustment of the sound output from the first and second sound output units 152a and 152b, And the like can be inputted. The rear input unit may be implemented as a touch input, a push input, or a combination thereof.

The rear input unit may be disposed so as to overlap with the front display unit 151 in the thickness direction of the terminal body. For example, the rear input unit may be disposed at the rear upper end of the terminal body such that when the user holds the terminal body with one hand, the rear input unit can be easily operated using the index finger. However, the present invention is not limited thereto, and the position of the rear input unit may be changed.

When a rear input unit is provided on the rear surface of the terminal body, a new type of user interface using the rear input unit can be realized. When the first operation unit 123a is not disposed on the front surface of the terminal body in place of at least a part of the functions of the first operation unit 123a provided on the front surface of the terminal body, The display unit 151 may be configured as a larger screen.

Meanwhile, the mobile terminal 100 may be provided with a fingerprint recognition sensor for recognizing the fingerprint of the user, and the controller 180 may use the fingerprint information sensed through the fingerprint recognition sensor as authentication means. The fingerprint recognition sensor may be embedded in the display unit 151 or the user input unit 123.

The microphone 122 is configured to receive the user's voice, other sounds, and the like. The microphone 122 may be provided at a plurality of locations to receive stereophonic sound.

The interface unit 160 is a path through which the mobile terminal 100 can be connected to an external device. For example, the interface unit 160 may include a connection terminal for connection with another device (for example, an earphone or an external speaker), a port for short-range communication (for example, an infrared port (IrDA Port), a Bluetooth port A wireless LAN port, or the like), or a power supply terminal for supplying power to the mobile terminal 100. The interface unit 160 may be implemented as a socket for receiving an external card such as a SIM (Subscriber Identification Module) or a UIM (User Identity Module) or a memory card for storing information.

And a second camera 121b may be disposed on a rear surface of the terminal body. In this case, the second camera 121b has a photographing direction which is substantially opposite to that of the first camera 121a.

The second camera 121b may include a plurality of lenses arranged along at least one line. The plurality of lenses may be arranged in a matrix form. Such a camera can be named an 'array camera'. When the second camera 121b is configured as an array camera, images can be taken in various ways using a plurality of lenses, and a better quality image can be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. The flash 124 shines light toward the subject when the subject is photographed by the second camera 121b.

And a second sound output unit 152b may be additionally disposed in the terminal body. The second sound output unit 152b may implement a stereo function together with the first sound output unit 152a and may be used for implementing a speakerphone mode in a call.

The terminal body may be provided with at least one antenna for wireless communication. The antenna may be embedded in the terminal body or formed in the case. For example, an antenna constituting a part of the broadcast receiving module 111 (see FIG. 1) can be configured to be able to be drawn out from the terminal body. Alternatively, the antenna may be formed in a film type and attached to the inner surface of the rear cover 103, or a case including a conductive material may be configured to function as an antenna.

The terminal body is provided with a power supply unit 190 (see FIG. 1) for supplying power to the mobile terminal 100. The power supply unit 190 may include a battery 191 built in the terminal body or detachable from the outside of the terminal body.

The battery 191 may be configured to receive power through a power cable connected to the interface unit 160. In addition, the battery 191 may be configured to be wirelessly chargeable through a wireless charger. The wireless charging may be implemented by a magnetic induction method or a resonance method (magnetic resonance method).

The rear cover 103 is configured to be coupled to the rear case 102 so as to cover the battery 191 to restrict the release of the battery 195 and to protect the battery 191 from external impact and foreign matter . When the battery 191 is detachably attached to the terminal body, the rear cover 103 may be detachably coupled to the rear case 102.

The mobile terminal 100 may be provided with an accessory that protects the appearance or supports or expands the function of the mobile terminal 100. [ One example of such an accessory is a cover or pouch that covers or accommodates at least one side of the mobile terminal 100. [ The cover or pouch may be configured to interlock with the display unit 151 to expand the function of the mobile terminal 100. Another example of an accessory is a touch pen for supplementing or extending a touch input to the touch screen.

1, a mobile terminal according to the present invention may include a Bluetooth ™, a Radio Frequency Identification (RFID), an Infrared Data Association (IrDA), a UWB (Ultra Wideband), a ZigBee, an NFC Field Communication), and Wireless USB (Wireless Universal Serial Bus).

As described above, the mobile communication module 112 and the wireless Internet module 113 according to the present invention can operate in a plurality of frequency bands according to carrier aggregation or switching between a plurality of communication methods, Antennas and communication modules are required. In this case, due to the lack of layout space, the remaining electronic components including the RF switch must be arranged so that the respective antennas and the communication modules are spaced apart from each other. As a result, a spurious radiated emission (SRE) ) And the feeding loss due to the increase of the power consumption.

This problem may occur due to the location of the broadcast receiving module 111, the short distance communication module 114, and the location information module 115, and the present invention proposes a mechanism for solving such a problem.

Hereinafter, the mobile terminal of the present invention having a plurality of antennas and an RF switch will be described in detail with reference to FIGS. 4 to 7. FIG.

A mobile terminal according to the present invention includes a plurality of antennas and an RF switch mounted in a circuit board of an inner space formed in a front case and a rear case.

4 illustrates a plurality of antennas and RF switches mounted in a circuit board of a mobile terminal according to an embodiment of the present invention. 5 is a block diagram of a mobile terminal including a plurality of antennas and an RF switch according to an embodiment of the present invention. Here, the plurality of antennas are coupled through single feed lines and connected to a single RF switch.

6 shows a plurality of antennas and an RF switch mounted in a circuit board of a mobile terminal according to another embodiment of the present invention. 7 is a block diagram of a mobile terminal including a plurality of antennas and an RF switch according to another embodiment of the present invention. Here, the plurality of antennas are respectively connected to a plurality of RF switches through a plurality of feed lines.

The circuit board 400 shown in Figs. 4 and 6 is disposed in the mobile terminal 100. Fig. In recent years, a plurality of antennas are employed for various communication services with an external device, a base station, or a server, thereby increasing the interface length between the plurality of antennas and some of the electronic components. The interface is referred to as a signal line or a feeder line because an RF signal is transmitted, and the feed loss is increased as the length of the feeder line is increased. The feeder line may be implemented as a single feeder line or a plurality of feeder lines when connected to a plurality of antennas.

Hereinafter, a structure in which the plurality of antennas are coupled through a single feed line and connected to a single RF switch will be described.

The circuit board 400 includes the plurality of antennas 410, the emission control unit 420, and the RF switch 430. In addition, the circuit board 400 may further include the matching circuit 440 and the feeder line 450.

The circuit board 400 may be mounted in the inner space of the mobile terminal in a 'C' shape. The circuit board 400 may include a first region in which the plurality of antennas 410 are disposed, a second region in which the RF switch 430 is disposed, and a third region in which the feed line 450 is disposed have. Meanwhile, when the circuit board 400 is mounted in the inner space of the mobile terminal, the battery can be fastened to the empty space of the rear case adjacent to the second area.

The plurality of antennas 410 includes a first antenna 411 and a second antenna 412. In addition, the plurality of antennas 401 may further include a third antenna 413.

The first antenna 411 transmits or receives electromagnetic waves in the first frequency band. Meanwhile, the second antenna 412 transmits or receives electromagnetic waves in a second frequency band that is lower than the first frequency band.

That is, the first antenna 411 is an antenna operating in a high frequency band and the second antenna 412 is an antenna operating in a low frequency band. For example, the first frequency band may be 1710 to 2690 MHz and the second frequency band may be 699 to 849 MHz.

The third antenna 413 transmits or receives electromagnetic waves in the third frequency band. For example, the third antenna 413 may perform wireless communication through the broadcast receiving module 111, the short distance communication module 114, and the location information module 115. Meanwhile, since the third antenna 413 is not connected to the RF switch 430 through the feeder line, control of unnecessary radiation and power supply loss through the radiation controller 420 is not performed. The third antenna 413 is impedance-matched through the matching circuit 440 and is connected to the wireless communication module to perform communication in the third frequency band.

The radiation control unit 420 includes at least one capacitor and one end of the capacitor is connected to a first point of the feed line 450 extending from an end point of the first antenna 411 And the other end of the capacitor is connected to the ground plane. Here, the radiation controller 420 may be replaced by an arbitrary element such as an inductor or a resistor in addition to the capacitor. In addition, the radiation control unit 420 may be implemented by a combination of capacitors and resistors, or any combination of inductors and resistors.

The RF switch 430 is connected at a second point of the feed line 450 to supply or cut off power applied to the first antenna 411 and the second antenna 412. The RF switch 430 may include a communication module that not only acts as a switch to supply or cut off power, but also generates, combines, separates and processes RF signals.

Meanwhile, in order to control the unnecessary radiation and feeding loss by the radiation line 450, the radiation control unit 420 controls the second point from the first point to a quarter wavelength of the electromagnetic wave in the first frequency band It is determined as a point spaced by an integer multiple.

4 and 5, the terminating end of the second antenna 412 is connected to the feed line 450, and the at least one capacitor includes a first capacitor and a second capacitor.

Here, one end of the first capacitor may be connected to the feed line 450 at a point at a half wavelength of the electromagnetic wave in the first frequency band from the second point. In addition, one end of the second capacitor may be connected to the feed line 450 at a point which is a half wavelength of the electromagnetic wave in the second frequency band from the second point.

The matching circuit 440 is disposed between the plurality of antennas 410 and the emission control unit 420 and matches the input impedance of each of the plurality of antennas 410 to a characteristic impedance of the feed line of 50 ohms . The matching circuit 440 may include an inductor or a capacitor in series with the feed line, and an inductor or a capacitor in parallel with the feed line and the ground plane.

The feed line 450 is coupled to the first antenna 411 and the second antenna 412 to transmit or receive signals in the first frequency band and the second frequency band through an electromagnetic wave, Lt; / RTI > For feeding low-loss electromagnetic waves to the antenna 400, the feeder line 450 may be implemented with a line width having a characteristic impedance of 50 ohms. In order to feed the first and second antennas 411 and 412, the characteristic impedance and the line width thereof may be changed.

The circuit board 400 may further include a controller 460 for controlling the turn-on or turn-off operation of the RF switch. Here, the controller 460 may transmit a control signal to turn off the RF switch 450 when the mobile terminal enters a standby state.

5, at least one capacitor C1, C2, C3 includes first to third capacitors, and one end of each of the first to third capacitors is connected to one end of the electromagnetic wave from the second point, / 2 < / RTI > wavelength, 1/4 wavelength, and an integral multiple of the 1/16 wavelength at the 1/2 wavelength. Here, the unwanted radiation can be controlled in a wide frequency band by the capacitors at the integral multiples of 1/16 wavelength.

The switching device may further include first and third switches SW1, SW2, and SW3 disposed between one end of the first, second, third, and fourth capacitors C1, C2, and C3 and the feed line 450. The first and third switches SW1, SW2, and Sw3 may be turned on or off by a switch control signal from the control unit.

For example, the controller 460 may turn on the first switch SW1 based on the level of the monitoring signal for communication or the signal-to-interference ratio.

For example, when the level of the signal or the signal-to-interference ratio is equal to or less than a predetermined value after the first switch SW1 is turned on, the control unit 460 controls the second switch SW2 or the third The switch SW3 can be turned on.

Referring to FIG. 4, it can be seen that the at least one capacitor is connected in parallel at a distance from the second point (connection point of the RF switch) to the first point. Also, the at least one capacitor may be connected in parallel at a distance from the second point (connection point of the first or second antenna) to the first point, as shown in Fig.

The radiation control unit 420 for preventing power loss when the first and second antennas 411 and 412 are coupled by the feed line 450 has been described above. Meanwhile, the radiation control unit 420 may operate mainly to prevent a power supply loss caused by the first antenna 411 operating in a high frequency band. However, it is possible to prevent a power supply loss caused by the second antenna 412 Of course. This structure has an advantage in that the feeding loss can be prevented by a relatively simple structure when the feeding loss due to the high frequency band is dominant.

Hereinafter, the plurality of antennas are respectively connected to a plurality of RF switches through a plurality of feed lines.

6 and 7, the circuit board 600 includes a plurality of antennas 410, a radiation controller 620, an RF switch 630, a matching circuit 440, and a feeder line 650.

Referring to FIG. 6, the plurality of antennas 410, the matching circuit 440, and the control unit 460 are replaced with the description in FIG.

The circuit board 600 further includes a radiation controller 620, an RF switch 630, and a feeder line 650.

The emission control unit 620 includes a first emission control unit 621 and a second emission control unit 622. In addition, the RF switch 630 may include a first RF switch 631 and a second RF switch 632. It should be noted that the RF switch 630 may be a single RF switch as shown in FIG. The feed line 650 includes a first feed line 651 and a second feed line 652.

One end of the capacitor is connected at a first point of a first feeder line 651 extending from an end point of the first antenna, and the first radiation controller 621 is connected at a second point of the first feeder line 651. The first radiation controller 621 includes at least one capacitor, The other end of the capacitor is connected to the ground plane.

The second radiation controller 622 includes at least one capacitor, and one end of the capacitor is connected at a second point of a second feeder line 652 extending from an end point of the second antenna, The other end of the capacitor is connected to the ground plane.

The first RF switch 631 is connected at a third point of the first feeder line 651 to supply or cut off power applied to the first antenna 411.

The second RF switch 632 is connected at a fourth point of the second feeder line 652 to supply or cut off power applied to the second antenna 412.

Here, the third point may be a point spaced from the first point by an integral multiple of a quarter wavelength of the electromagnetic wave in the first frequency band. In addition, the fourth point may be a point spaced from the second point by an integral multiple of a quarter wavelength of the electromagnetic wave in the second frequency band.

 The first radiation controller 621 includes first to third capacitors C1 to C3 and one ends of the first to third capacitors C1 to C3 are connected to the first to third capacitors C1, And may be connected to the feed line 651 at 1/2 wavelength, 1/4 wavelength of the electromagnetic wave in the 1-frequency band, and an integral multiple of 1/16 wavelength at the 1/2 wavelength.

One end of each of the fourth to sixth capacitors C4, C5 and C6 is connected to the second emission control unit 622 from the second point to the second emission control unit 622. The second emission control unit 622 includes fourth to sixth capacitors C4 to C5, 2 waveband, 1/4 wavelength of the electromagnetic wave in the first frequency band, and an integral multiple of the 1/16 wavelength in the second waveband.

The first and second radiation controllers 621 and 622 are connected to switches SW1 to SW6 disposed between one end of the first to sixth capacitors C1 to C6 and the first and second feeder lines 651 and 652, . Here, the first to sixth switches SW1 to SW6 are turned on or off by a switch control signal from the controller 460.

The radiation control units 621 and 622 for preventing power loss when the first and second antennas 411 and 412 are connected by the feed lines 651 and 652 have been described above. This has an advantage that the power supply loss can be independently controlled not only in the first frequency band that is a high frequency band but also in a second frequency band that is a low frequency band.

Hereinafter, a method for controlling unwanted radiation due to power loss in a mobile terminal having a radiation control unit according to the present invention will be described.

FIG. 8 is a flowchart showing a method for controlling unwanted radiation according to the feeding loss according to the present invention. The control method may be performed by the control unit 180 or 460 of the mobile terminal according to the present invention.

The control method S800 includes an RSE comparison step S810, an antenna determination step S820, and a radiation control step S830.

The RSE comparison step S810 compares the loss value due to Radiated Spurious Emission (RSE) with a predetermined value.

The antenna determining step S820 determines whether the unwanted radiation is generated by the first and second antennas, respectively, operating in the first frequency band and the second frequency band lower than the first frequency band. Meanwhile, the antenna determination step S820 is performed when the loss value is greater than the predetermined value in the RSE comparison step S810.

The radiation control step S830 performs a first control step S840 and a second control step S850. The first control step (S840) is performed when spurious emission occurs by the first antenna in the antenna determination step (S820). In addition, the second control step (S850) is performed when spurious emission occurs by the second antenna in the antenna determination step (S820).

The emission control step (S830) turns on a first capacitor disposed at a point which is a half wavelength of an electromagnetic wave of a first frequency or a second frequency band from an end of the RF switch among a plurality of capacitors.

The first control step S840 includes a first capacitor control step S841, an RSE comparison step S842, and a second and a third capacitor control step S843.

The first capacitor control step (S841) may include a step of, when the unwanted radiation is generated by the first antenna, a first capacitor control step (S841) 1 Turn on the capacitor.

The RSE comparison step S842 compares the loss value due to spurious emission with a predetermined value when the first capacitor is turned on.

In the second control step (S850), when the unwanted emission is generated by the second antenna, a fourth capacitor disposed at a point at a half wavelength of the electromagnetic wave in the second frequency band is turned on.

The second and third capacitor control step (S843) may further include, when the loss value is equal to or greater than a preset value, resetting the second and third capacitors from the terminal of the RF switch among the plurality of capacitors, And at least one of the capacitors and the third capacitors disposed at points that are integral multiples of 1/16 wavelength at the 1/2 wavelength. Here, after the second capacitor is turned on and the RSE comparison step S842 is performed again, the remaining capacitors may be turned on according to the comparison result.

 As described above, turning on the first to third capacitors sequentially reduces the power supply loss due to unnecessary radiation of the antenna and the feeder line each time the capacitor is connected to the feeder line, but since the loss of the capacitor itself increases, for trade off.

Hereinafter, a mobile terminal having a radiation controller including at least one capacitor or an arbitrary element according to the present invention and a method for controlling unwanted radiation have been described.

In the structure in which the feeding loss due to the interfaces between the antennas and the RF switch is increased due to the space restriction due to the arrangement of the plurality of antennas and the communication module in the mobile terminal by the radiation control unit and the spurious emission control method, Can be effectively controlled.

According to at least one of the embodiments of the present invention, it is possible to reduce power supply loss due to unnecessary radiation of RF power in a high frequency band by the power supply line disposed in the mobile terminal.

In addition, according to at least one of the embodiments of the present invention, it is possible to provide an efficient control method capable of reducing power supply loss due to unnecessary radiation of RF power by a feeder line in a mobile terminal having a plurality of antennas .

The present invention described above can be embodied as computer-readable codes on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer readable medium include a hard disk drive (HDD), a solid state disk (SSD), a silicon disk drive (SDD), a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, , And may also be implemented in the form of a carrier wave (e.g., transmission over the Internet). Also, the computer may include a control unit 180 of the terminal. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

100: mobile terminal 400: circuit board
410: antenna 420, 620: radiation control unit

Claims (13)

A first antenna for transmitting or receiving electromagnetic waves in a first frequency band;
A second antenna for transmitting or receiving electromagnetic waves in a second frequency band that is lower than the first frequency band;
Wherein one end of the capacitor is connected at a first point of a feed line extending from an end point of the first antenna and the other end of the capacitor is connected to a ground plane, A control unit; And
And an RF switch connected at a second point of the feed line to supply or cut off power applied to the first antenna and the second antenna,
And the second point is a point spaced apart from the first point by an integral multiple of a quarter wavelength of the electromagnetic wave in the first frequency band. The method according to claim 1,
The end of the second antenna is connected to the feed line,
Wherein the at least one capacitor comprises a first capacitor and a second capacitor,
One end of the first capacitor is connected to the feed line at a point which is a half wavelength of the electromagnetic wave in the first frequency band from the second point,
And one end of the second capacitor is connected to the feed line at a point which is a half wavelength of the electromagnetic wave in the second frequency band from the second point. The method according to claim 1,
Further comprising a control unit for controlling a turn-on or a turn-off operation of the RF switch, wherein the control unit transmits a control signal to turn off the RF switch when the mobile terminal enters a standby state. The method of claim 3,
Wherein the at least one capacitor comprises first to third capacitors,
One end of each of the first to third capacitors is connected to the feed line at points that are an integral multiple of a 1/16 wavelength of the electromagnetic wave from the second point at a half wavelength and a quarter wavelength, Lt; / RTI > 5. The method of claim 4,
Further comprising first to third switches disposed between one end of the first to third capacitors and the feeder line,
And the first to third switches are turned on or off by a switch control signal from the control unit. 6. The method of claim 5,
Wherein the control unit turns on the first switch based on the level of the monitoring signal for communication or the signal-to-interference ratio. The method according to claim 6,
Wherein the control unit turns on the second switch or the third switch when the level of the signal or the signal-to-interference ratio is equal to or less than a predetermined value after the first switch is turned on. The method according to claim 1,
Wherein the first frequency band is 1710 to 2690 MHz and the second frequency band is 699 to 849 MHz. The method according to claim 1,
Further comprising a matching circuit disposed between the first antenna and the second antenna and the radiation control, the matching circuit being configured to match the respective input impedance of the first antenna and the second antenna to the characteristic impedance of the feed line. terminal. The method according to claim 1,
Characterized in that the RF switch comprises a communication module for generating, combining, separating and processing an RF signal. A method of controlling a mobile terminal,
Comparing a loss value due to radiated spurious emission (RSE) with a predetermined value;
Determining whether the unwanted radiation is generated by a first antenna or a second antenna operating in a first frequency band and a second frequency band lower than the first frequency band;
When the unwanted radiation is generated by the first antenna, turning on a first capacitor disposed at a point which is a half wavelength of the electromagnetic wave of the first frequency band from the end of the RF switch among the plurality of capacitors Of the mobile terminal. 12. The method of claim 11,
After the step of turning on the first capacitor,
Comparing a loss value due to spurious emission with a predetermined value;
A second capacitor disposed at a quarter wavelength of the electromagnetic wave from an end of the RF switch among the plurality of capacitors and a third capacitor disposed at an integer multiple of a 1/16 wavelength at the 1/2 wavelength, ≪ / RTI > further comprising the step of turning on at least one of the plurality of antennas. 12. The method of claim 11,
And turning on a fourth capacitor disposed at a point which is a half wavelength of the electromagnetic wave in the second frequency band when the unwanted radiation is generated by the second antenna.

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