CN104810605B - A kind of antenna assembly for separately coupling feed-in - Google Patents

Abstract

The present invention relates to an antenna device, in particular to an antenna device with separate coupling and feeding. It includes a metal bracket for a motherboard or a display screen, a metal frame, the metal frame includes a short side, the metal frame is provided with at least one breakpoint on the short side, and at least one feed pin connected to the front end of the radio frequency, and is characterized in that: It also includes: a high-frequency metal arm close to the feed pin and a low-frequency metal arm far away from the feed pin formed by separating the short sides of the metal frame by breakpoints; an antenna coupling unit, including a longer low-frequency a coupling branch and a shorter high-frequency coupling branch located on the side of the low-frequency coupling branch close to the short side of the metal frame, the end of the low-frequency coupling branch is close to the low-frequency metal arm, and the high-frequency coupling branch is close to the high-frequency metal arm arm. It has better bandwidth and is easy to debug.

Description

An antenna device with separate coupling and feeding

Technical field:

The present invention relates to an antenna device, in particular to an antenna device with separate coupling and feeding.

Background technique:

Compared with mobile terminals with ordinary plastic shells, users prefer mobile terminals with metal texture, and the problem of antenna signals caused by this has always been a problem that plagues the industry.

At present, there are three effective solutions: the antenna directly feeds the side breakpoint of the metal frame, the antenna directly feeds the metal frame side bottom breakpoint, and the antenna couples the bottom breakpoint of the metal frame. Each of these solutions has several specific implementations.

As disclosed in the Chinese invention patent (Application No.: 201310038945.8), a coupling-feed antenna device for a mobile terminal adopts a breakpoint method at the bottom edge of the antenna coupling metal frame, which only has a low-frequency coupling unit and a grounded high-frequency The high-frequency parasitic unit, and only the low-frequency coupling unit is close to the coupling metal frame, and the feed point is on the same side as the low-frequency coupling metal arm. It is the same as the way that the antenna directly feeds the side bottom breakpoint of the metal frame, and has the disadvantages of insufficient bandwidth and difficult debugging; The way that the antenna directly feeds the breakpoint on the side of the metal frame also has the disadvantage of seriously degrading the communication quality when it is held in the hand.

Invention content:

The object of the present invention is to provide an antenna device with separate coupling and feeding. It has better bandwidth and is easy to debug.

The technical scheme of a separate coupling-feed antenna device described in the present invention is realized in this way:

An antenna device for separate coupling and feeding, which includes a main board or a metal bracket for a display screen, a metal frame, the metal frame includes a short side, the metal frame is provided with at least one break point on the short side, and at least one is connected to the radio frequency front end The feed pin is characterized in that: it also includes:

A high-frequency metal arm close to the feed pin and a low-frequency metal arm far away from the feed pin are formed by separating the short side of the metal frame by a breakpoint;

An antenna coupling unit, including a longer low-frequency coupling branch and a shorter high-frequency coupling branch located on the side of the low-frequency coupling branch close to the short side of the metal frame, the end of the low-frequency coupling branch is close to the low-frequency metal arm, so The high frequency coupling branch is close to the high frequency metal arm.

Compared with the prior art, a separately coupled and fed-in antenna device according to the present invention has the following advantages:

1. The antenna of the invention patent splits a coupling unit into a low-frequency coupling branch and a high-frequency coupling branch, and the low-frequency coupling branch and the high-frequency coupling branch are close to the metal frame at the same time, and the low-frequency metal arm is far away from the feed point and the high-frequency metal arm The arm is close to the feed point, and there is no grounded parasitic unit, which enables the antenna of the present invention to tune low frequency and high frequency independently, even in a poor antenna environment, the antenna can still maintain good bandwidth and efficiency;

2. Using the breakpoint technology at the bottom edge of the metal frame that separates the antenna coupling, it solves the problems of large hand grip, narrow bandwidth, and difficult debugging, and achieves better results;

3. The high-frequency metal arm is close to the feed point, and the nearest coupling is high-frequency coupling, so the high-frequency bandwidth of the antenna of the present invention has obvious advantages;

4. There is no strong coupling between the high-frequency metal arm and the low-frequency metal arm of the antenna of the present invention, which makes radiation easier and further improves the low-frequency bandwidth of the antenna.

The number of the above-mentioned feeding pin is one, the high-frequency coupling branch and the low-frequency coupling branch are connected to the feeding pin, the high-frequency coupling branch is coupled with the high-frequency coupling arm, and the low-frequency coupling branch is connected with the low-frequency coupling arm at the same time. The coupling arm is coupled with the high frequency coupling arm, or is coupled with the low frequency coupling arm separately.

The aforementioned high-frequency coupling branch and high-frequency metal arm, between the low-frequency coupling branch and low-frequency metal arm, and between the low-frequency coupling branch and high-frequency metal arm can be connected through lumped elements.

A first connection point and a second connection point are also provided between the above-mentioned metal frame and the main board or the metal bracket of the display screen, and the first connection point and the second connection point are connected to the ground.

Description of drawings:

Below in conjunction with accompanying drawing, the present invention is described in detail:

FIG. 1 is a schematic structural diagram of Embodiment 1 of a separate coupling and feeding antenna device according to the present invention;

Fig. 2 is an antenna standing wave diagram of Embodiment 1 of a separately coupled and fed-in antenna device according to the present invention;

Fig. 3 is a circular diagram of the polar coordinates of the antenna impedance of Embodiment 1 of a separate coupling and feeding antenna device according to the present invention;

FIG. 4 is a schematic structural diagram of Embodiment 2 of an antenna device for separate coupling and feeding according to the present invention;

FIG. 5 is a schematic structural diagram of Embodiment 3 of an antenna device for separate coupling and feeding according to the present invention;

FIG. 6 is a schematic structural diagram of Embodiment 4 of an antenna device for separate coupling and feeding according to the present invention.

Detailed ways:

As shown in Fig. 1, Fig. 2 and Fig. 3, it is Embodiment 1 of a separately coupled and fed-in antenna device according to the present invention:

A kind of separate coupling feed-in antenna device, it comprises a main board or display screen metal support 1, a metal frame 2, and metal frame 2 comprises a short side, and metal frame is provided with first break point 21 and second break point 21 on the short side. Breakpoint 22, a feed pin 5 connected to the RF front end, it also includes:

A high-frequency metal arm 24 close to the feed pin 5 and a low-frequency metal arm 23 far away from the feed pin are formed by separating the short sides of the metal frame by the first break point 21 and the second break point 22;

An antenna coupling unit, including a longer low-frequency coupling branch 3 and a shorter high-frequency coupling branch 4 located on the side of the low-frequency coupling branch 3 close to the short side of the metal frame, the end of the low-frequency coupling branch 3 is close to the low-frequency Metal arm 23 , the high frequency coupling branch 4 is close to the high frequency metal arm 24 .

The high-frequency coupling branch 4 and the low-frequency coupling branch 3 are jointly connected to the feed pin 5, the high-frequency coupling branch 4 is coupled with the high-frequency coupling arm 24, and the low-frequency coupling branch 3 is separately coupled with the low-frequency coupling arm 23 .

A first connection point 6 and a second connection point 7 are also provided between the metal frame 2 and the main board or the metal bracket 1 of the display screen, and the first connection point 6 and the second connection point 7 are connected to the ground.

The metal frame 2 may be a metal front frame or a metal middle frame of a mobile terminal.

As shown in FIG. 4 , it is a schematic structural diagram of Embodiment 2 of a separate coupling and feeding antenna device according to the present invention;

Different from Embodiment 1, the metal frame 2 is only provided with a first break point 21 on the short side, and a USB module 8 is added.

As shown in FIG. 5 , it is a schematic structural diagram of Embodiment 3 of a separate coupling and feeding antenna device according to the present invention;

Different from Embodiment 1, the low-frequency coupling branch 3 is coupled to the low-frequency coupling arm 23 and the high-frequency coupling arm 24 at the same time, which further increases the low-frequency bandwidth.

FIG. 6 is a schematic structural diagram of Embodiment 4 of a separate coupling and feeding antenna device according to the present invention.

Different from the third embodiment, the high-frequency coupling branch 4 and the high-frequency metal arm 24 are connected through the first lumped element 27, and the low-frequency coupling branch 3 and the low-frequency metal arm 23 are connected through the second lumped element 25 The connection between the low-frequency coupling branch 3 and the high-frequency metal arm 24 is connected through the third lumped element 26, and the use of the lumped element instead of the coupling of the slot can make antenna debugging easier;

The first lumped element 27, the second lumped element 25, and the third lumped element 26 may be capacitors.

The above content is a further detailed description of the present invention in conjunction with specific examples, and it cannot be considered that the specific implementation is limited to these descriptions. For example: the number of the feed point is not limited to one, the length of the high-frequency coupling branch, the low-frequency coupling branch and the gap size of the metal frame are not limited to the content disclosed in the drawings of the embodiment, and the distance between the coupling branch and the metal frame arm is increased. The amount of coupling can be realized by reducing the gap between the two, increasing the respective lengths of the two, and vice versa. On the basis of understanding the intention of the present invention, the position of the breakpoint can be easily adjusted, the first connection point and the second The location of the connection point and the length of the high-frequency coupling branch and the low-frequency coupling branch are used to optimize the antenna. For those skilled in the technical field to which the present invention belongs, on the premise of not departing from the concept of the present invention, the specific embodiments of the present invention are not limited to the above examples. In the specific implementation process of the present invention, the specific embodiments can also be made Several deduction or optimization, these deduction or optimization should be regarded as belonging to the protection scope of the present invention.

Claims (1)

1. An antenna device for separately coupled feed-in, it comprises a main board or display screen metal support, a metal frame, the metal frame comprises a short side, the metal frame is provided with at least one breakpoint on the short side, at least one is connected to The feed pin of the radio frequency front end is characterized in that: it also includes: A high-frequency metal arm close to the feed pin and a low-frequency metal arm far away from the feed pin are formed by separating the short side of the metal frame by a breakpoint; An antenna coupling unit, including a longer low-frequency coupling branch and a shorter high-frequency coupling branch located on the side of the low-frequency coupling branch close to the short side of the metal frame, the end of the low-frequency coupling branch is close to the low-frequency metal arm, so The high-frequency coupling branch is close to the high-frequency metal arm; The number of the feed pin is one, the high frequency coupling branch and the low frequency coupling branch are connected to the feed pin, the high frequency coupling branch is coupled with the high frequency coupling arm, and the low frequency coupling branch is simultaneously coupled with the low frequency The arm is coupled with the high-frequency coupling arm, or is coupled with the low-frequency coupling arm alone, between the high-frequency coupling branch and the high-frequency metal arm, between the low-frequency coupling branch and the low-frequency metal arm, and between the low-frequency coupling branch and the high-frequency metal arm It can be connected through lumped elements, and there are also a first connection point and a second connection point between the metal frame and the main board or the metal support of the display screen, and the first connection point and the second connection point are connected to the ground.