CN202817169U - Antenna radiated energy reduction device - Google Patents

Abstract

The utility model discloses a device for reducing antenna radiation energy, which comprises an antenna and a proximity sensor, wherein the antenna is electrically connected with a grounding metal surface, a high pass filter is connected in series between the antenna and the grounding metal surface, the proximity sensor is provided with a sensing chip which is electrically connected with a low pass filter, the low pass filter is electrically connected with a circuit between the high pass filter and the antenna, and the antenna and the proximity sensor are arranged on a circuit board, because the proximity sensor and the antenna share the grounding metal surface, and the antenna and the proximity sensor can not interfere with each other when in operation by utilizing the high pass filter and the low pass filter, the antenna and the proximity sensor can be integrated in a predetermined area of the circuit board, the space occupied by the antenna and the proximity sensor can be reduced, the induction accuracy of the proximity sensor can be improved, and the radiation power of the antenna can be effectively reduced, meanwhile, the purposes of reducing the volume and improving the applicability are achieved.

Description

Antenna radiated energy reduction device

technical field

The utility model provides a device for reducing antenna radiation energy, especially a high-pass filter is connected in series between the antenna and the grounding metal surface, and the sensing chip adjacent to the sensor is electrically connected to the low-pass filter, and then electrically connected to the The circuit between the high-pass filter and the antenna to share the grounded metal plane and avoid mutual interference between the antenna and adjacent sensors.

Background technique

With the development and popularization of wireless communication technology, wireless communication devices can be seen in many places in today's life. Any wireless communication device needs to be equipped with an antenna to transmit and receive wireless signals, but the electromagnetic waves radiated by the antenna Often it may endanger human health, so countries have formulated relevant laws and regulations to stipulate the electromagnetic wave energy absorption rate (Specific Absorption Rate, SAR) of wireless communication devices that can emit electromagnetic waves (such as mobile phones or tablet computers, etc.). The ratio refers to the electromagnetic wave energy absorbed by human tissue per unit mass per unit time. The higher the value, the greater the potential harm to the human body. Therefore, it must be lower than a safe value to limit the energy that can be radiated by electronic devices or can The maximum limit of radiation.

If the wireless communication device fails to pass the electromagnetic wave energy absorption ratio test and safety regulations, it cannot be sold or imported in the market according to law. Therefore, in order to make the SAR value meet the test specifications, most of the existing wireless communication devices just blindly reduce the total radiation power , in order to maintain the SAR value in the safe test range, but as the radiation power decreases, the distance transmitted by the electromagnetic wave will be reduced accordingly, which will affect the communication quality of the wireless communication device.

Therefore, some manufacturers have researched and developed for this problem, by installing a proximity sensor (Proximity Sensor, P-sensor) to reduce the output power of the power amplifier, so that the input power of the antenna is reduced, thereby reducing the radiation power of the antenna, so as to Take a mobile phone as an example. When the user moves the mobile phone to the ear to make a call, the mobile phone is closest to the human body and the influence of electromagnetic waves is the most serious. At this time, the proximity sensor will sense the proximity to the human body and reduce the radiation power, that is The SAR value can be made to meet the test specifications to ensure the health of the user.

Please refer to Figure 5, the proximity sensor A mainly includes the circuit board A1, the sensing chip (IC) A2 and the sensing metal sheet A3, since the sensing metal sheet A3 needs to be designed with a large area, it can be accurately The approach of the human body is detected, but in terms of design, the induction will fail when the sensing metal sheet A3 is too close to the ground of the wireless communication system, and the radiation performance of the antenna will be seriously affected when the sensing metal sheet A3 is too close to the antenna. Therefore, the general design is to divide the proximity sensor A and the antenna into two independent components and place them separately. When the proximity sensor A and the antenna are actually used, because the sensing metal sheet of the proximity sensor A is too large, and the proximity sensor A and the antenna cannot be integrated in the same area with complete functions, so the product volume is small. Could not zoom out.

Therefore, how to solve the problem and deficiency that the existing proximity sensors and antennas take up too much volume is the direction that relevant manufacturers engaged in this industry are eager to study and improve.

Contents of the invention

The main purpose of the utility model is to solve the problem that the existing proximity sensor and antenna occupy too much volume, and provide a sensor that can not only improve the sensing accuracy of the proximity sensor and effectively reduce the radiation power of the antenna, but also reduce the volume and improve the applicability. installation.

In order to achieve the above purpose, the utility model provides a device for reducing antenna radiated energy, including an antenna and a proximity sensor, wherein the antenna is electrically connected to a grounded metal surface, and a high-pass filter is connected in series between the antenna and the grounded metal surface; The proximity sensor has a sensing chip, the sensing chip is electrically connected to a low-pass filter, and the low-pass filter is electrically connected to a circuit between the high-pass filter and the antenna, and the antenna and the proximity sensor are arranged on a circuit board superior.

In practice, the proximity sensor senses at a frequency of 250kHz, the ambient capacitance is about 1-60pF, and the high-pass filter is composed of one or more capacitors, which are low-capacitance components.

During implementation, an alternating current is connected in series between the high-pass filter and the grounded metal plane.

When implemented, this low-pass filter consists of an inductor.

When implemented, the antenna is of the PIFA, dipole, monopole, FICA or loop type.

Compared with the prior art, the utility model has the beneficial effects of:

The proximity sensor of the utility model shares the grounded metal surface of the antenna as the sensing surface, and uses a high-pass filter and a low-pass filter to isolate the high-frequency signal generated by the antenna and the low-frequency signal generated by the proximity sensor, so that the antenna and the proximity sensor The antenna and the proximity sensor can be integrated in a predetermined area of the circuit board without interfering with each other, thereby reducing the occupied space and being suitable for different types of antennas, which can improve the sensing accuracy of the proximity sensor and reduce the In the case of reducing the radiation power of the antenna, the purpose of reducing the product size and improving the applicability is achieved at the same time.

Description of drawings

Fig. 1 is the circuit diagram of the utility model.

Fig. 2 is the exterior view of the utility model.

Fig. 3 is an impedance matching diagram of the antenna of the present invention.

FIG. 4 is an impedance matching diagram of the antenna combined with the proximity sensor of the present invention.

FIG. 5 is an exploded perspective view of a conventional proximity sensor.

Explanation of reference numerals: 1-antenna; 11-ground metal surface; 13-alternating current; 12-high-pass filter; 2-proximity sensor; 21-sensing chip; 22-low-pass filter; 3-circuit board.

Detailed ways

In order to achieve the above-mentioned purpose and effect, the technical means and the structure adopted by the utility model are hereby drawn to illustrate in detail the features and functions of the preferred embodiments of the utility model as follows, in order to fully understand.

Please refer to Fig. 1 and Fig. 2, which are circuit diagrams and appearance diagrams of the present utility model. It can be clearly seen from the diagrams that the device for reducing antenna radiation energy includes an antenna 1 and a proximity sensor 2 (Proximity Sensor, P- sensor); where:

The antenna 1 is electrically connected to a grounded metal surface 11, and a high-pass filter 12 composed of one or more capacitors 13 is connected in series between the antenna 1 and the grounded metal surface 11, and the high-pass filter 12 is connected to the grounded metal surface 11. There can be alternating current 14 in series between.

The proximity sensor 2 has a sensing chip (IC) 21. The sensing chip 21 is a low-pass filter 22 electrically connected with an inductor. The low-pass filter 22 is then electrically connected between the high-pass filter 12 and the antenna 1. The circuit between them, and the antenna 1 and the proximity sensor 2 are arranged on a circuit board 3 .

The above-mentioned antenna 1 can be PIFA, dipole, monopole, FICA or loop (Loop) and other types of antennas, and it only has the function of transmitting and receiving wireless signals, which does not limit the patent scope of the present utility model. If other modifications and equivalent structural changes are used, they should be included in the scope of the patent of the utility model in the same way, and Chen Ming is hereby agreed.

Please refer to Fig. 1 and Fig. 2, which are circuit diagrams and appearance diagrams of the present utility model. From the diagrams, it can be clearly seen that the proximity sensor 2 is mainly connected to the grounded metal surface 11 of the antenna 1 by electrical properties. Using the grounded metal plane 11 as the sensing area, when the low-frequency signal generated by the sensing chip 21 adjacent to the sensor 2 is transmitted to the circuit between the antenna 1 and the grounded metal plane 11, its high-pass filter 12 can filter out the following To isolate the low-frequency signal, please refer to Figure 3 and Figure 4 at the same time, which are the impedance matching diagrams of the PIFA antenna 1 alone and the impedance matching diagram of the PIFA antenna 1 combined with the adjacent sensor 2. The impedance matching reference line in the figure is at high The frequency part A can know that its dB value is lower (compared with the reference line of -10dB), which means that its impedance matching is better, which can prevent low frequency signals from affecting the radiation performance of antenna 1

In addition, because the proximity sensor 2 senses at a frequency of 250kHz, the ambient capacitance is about 1-60pF, so the low-pass filter 22 must use a low-capacitance element, and the high-frequency signal generated by the antenna 1 is transmitted to the grounded metal When connecting the circuit between the antenna 11, the high-frequency signal shunted towards the adjacent inductor 2 will be filtered out and isolated by the low-pass filter 22. Please refer to the third and fourth figures at the same time, which are the impedance matching diagrams of the antenna 1 And the impedance matching diagram of antenna 1 combined with adjacent sensor 2, from the impedance matching reference line in the figure in the low-frequency part B, it can be seen that the difference is not large, which means that the high-frequency signal of antenna 1 will not affect the adjacent sensor 2, that is, To prevent the proximity sensor 2 from being affected, causing the sensing to fail or reduce the accuracy of sensing, thereby preventing false sensing of the human body.

The above-mentioned device for reducing antenna radiation energy of the present utility model has the following advantages in actual use, such as:

(1) The proximity sensor 2 uses the grounded metal surface 11 of the antenna 1 as the sensing surface, so it can have the effect of sharing the grounded metal surface 11, because the proximity sensor 2 does not need to be additionally provided with a sensing metal sheet, which can reduce the The effect of product volume.

(2) By using the high-pass filter 12 and the low-pass filter 22, the antenna 1 and the proximity sensor 2 will not interfere with each other during operation, and the antenna 1 and the proximity sensor 2 can be effectively integrated on the circuit board 3 In a predetermined area, the space occupied by the antenna 1 and the proximity sensor 2 can be reduced, and it can be applied to different types of antennas 1 due to the small space occupied, and will not be limited by the ground of the wireless communication system.

(3) By using the high-pass filter 12 and the low-pass filter 22, the antenna 1 and the adjacent sensor 2 will not interfere with each other, so that the sensing accuracy of the adjacent sensor 2 can be improved and the radiation power of the antenna can be effectively reduced.

Therefore, the utility model is mainly aimed at reducing the radiation energy of the antenna, and a high-pass filter 12 can be connected in series between the antenna 1 and the grounded metal surface 11, and the sensing chip 21 adjacent to the sensor 2 is electrically connected to the low-pass filter. After 22, the circuit between the high-pass filter 12 and the antenna 1 is electrically connected to achieve a common grounding metal surface 11, and to avoid mutual interference between the antenna 1 and the adjacent sensor 2, so as to improve the sensing accuracy of the adjacent sensor 2 Under the effect of effectively reducing the radiation power of the antenna, the main protection focus is to reduce the size and improve the applicability at the same time.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the patent scope of the present utility model. Therefore, all simple modifications and equivalent structural changes made by using the specification and drawings of the present utility model should be In like manner, it is included in the scope of patents of the present utility model, and it is jointly granted to Chen Ming.

Claims (5)

1. one kind is reduced the antenna energy device, comprises antenna and proximity sensing device, it is characterized in that,

This antenna is electrically connected with grounding metal plane, and is in series with high pass filter between antenna and the grounding metal plane;

This proximity sensing utensil has sensor chip, and sensor chip is electrically connected with low pass filter, and low pass filter is electrically connected at the circuit between high pass filter and the antenna again, and antenna and proximity sensing device are arranged on the circuit board.

2. reduction antenna energy device as claimed in claim 1, it is characterized in that this proximity sensing device is for to respond to the frequency of 250kHz, environment electric capacity is about 1～60pF, high pass filter utilizes one or more electric capacity to form, and its electric capacity is low capacity cell.

3. reduction antenna energy device as claimed in claim 1 is characterized in that, is in series with alternating current between this high pass filter and the grounding metal plane.

4. reduction antenna energy device as claimed in claim 1 is characterized in that this low pass filter is comprised of inductance.

5. reduction antenna energy device as claimed in claim 1 is characterized in that, this antenna is PIFA, dipole, one pole, FICA or ring-like pattern.

Images