CN114755501A - SAR detection device and electronic equipment - Google Patents

Abstract

The application discloses SAR detection device and electronic equipment, SAR detection device include SAR sensor and two at least antennas, two at least antennas include first antenna and second antenna, first antenna with connect through signal channel between the SAR sensor, connect through connecting link between two at least antennas, connecting link is configured to allow direct current signal transmission and block alternating current signal transmission. The SAR sensor can be connected with a larger number of radiation antennas under the condition that the number of signal channels of the SAR sensor is the same, and cost reduction is facilitated.

Description

SAR detection device and electronic equipment

technical field

The present application relates to the technical field of SAR detection, and in particular, to a SAR detection device and electronic equipment.

Background technique

The specific absorption rate (SAR) of electromagnetic waves reflects the absorption ratio of electromagnetic energy by the human body. The higher the SAR value of the wireless communication device, the greater the electromagnetic radiation damage to the human body. In order to strictly control the SAR value of the wireless communication device, a SAR sensor connected to the processor is usually provided in the wireless communication device. The SAR sensor uses a signal channel to connect the metal sensing element. When the user approaches or moves away from the metal sensing element, the capacitance between the user and the metal sensing element can be changed. The capacitance variation is obtained when changing, and the processor can adjust the radiation power of the radio frequency circuit in the wireless communication device according to the received capacitance variation, so as to achieve the purpose of adjusting the specific absorption rate of the wireless communication device. Usually, the metal sensing element can use the radiating antenna of the wireless communication device, that is to say, the radiating antenna also plays the role of detecting the SAR value in addition to the basic radiating antenna function.

With the development of science and technology, the number of radiating antennas that need to be connected to the SAR sensor has increased to 5 or more, so the existing 8-channel SAR sensor can no longer meet the design requirements; one or more SAR sensors need to be added. , resulting in an increase in costs.

Therefore, it is necessary to provide a SAR detection device that can connect a larger number of radiating antennas under the condition that the number of signal channels of the SAR sensor remains unchanged, which is beneficial to cost reduction.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide a SAR detection device and electronic equipment, which can connect a larger number of radiating antennas under the condition that the number of signal channels of the SAR sensor is the same, which is beneficial to the reduction of cost.

In order to achieve the above purpose, the present application provides a SAR detection device, comprising:

SAR sensor;

at least two antennas, the at least two antennas include a first antenna and a second antenna, the first antenna and the SAR sensor are connected through a signal channel, and the at least two antennas are connected through a connection line, The connecting line is configured to allow DC signal transmission and block AC signal transmission.

Optionally, the connection line is provided with an inductance.

Optionally, the connection lines between the two adjacent antennas are respectively provided with the inductances at positions within a preset value of the two adjacent antennas.

Optionally, the distance between the inductor and the adjacent antenna is not more than 2 mm.

Optionally, the antenna includes an antenna body, a feeder branch and a ground branch connected to the antenna body;

The antenna is connected to the connection line by means of the feed branch and/or the ground branch.

Optionally, a first capacitor is provided on the feeder branch, and the connection line is connected between the first capacitor and the antenna body.

Optionally, a second capacitor is provided on the ground branch, and the connection line is connected between the second capacitor and the antenna body.

Optionally, the AC signal in the entire operating frequency range of the two adjacent antennas is blocked by the connection line connected between the two adjacent antennas.

Optionally, the signal channel includes a sensing channel and a reference channel.

In order to achieve the above object, the present application also provides an electronic device, including the above-mentioned SAR detection device.

In the present application, at least two antennas are connected by connecting lines, and the connecting lines allow DC signals to pass through, so that the DC signals of each antenna can be transmitted to the SAR sensor using the signal channel of the first antenna. The signal channel can realize the DC signal transmission between at least two antennas, so that a larger number of radiating antennas can be connected when the number of signal channels of the SAR sensor is the same, which is beneficial to cost reduction. Moreover, since the connecting line can block the AC signal, each antenna can maintain the independence when working as a radiating antenna itself.

Description of drawings

1 to 6 respectively show schematic diagrams of SAR detection devices in different embodiments of the present application.

Detailed ways

In order to describe in detail the technical content, structural features, achieved objects and effects of the present application, detailed descriptions are given below with reference to the embodiments and the accompanying drawings.

Referring to FIGS. 1 to 6 , an embodiment of the present application discloses a SAR detection device, which includes a SAR sensor 1 and at least two antennas 2 . The at least two antennas 2 include a first antenna 2a and a second antenna 2b, the first antenna 2a and the SAR sensor 1 are connected through a signal channel 3, and the at least two antennas 2 are connected through a connection line 4, and the connection line 4 is configured To allow DC signal transmission and block AC signal transmission.

have to be aware of is:

The "at least two antennas 2" defined in the present application refer to a group of antennas that are connected by connecting lines 4 and perform DC signal transmission with the SAR sensor 1 through the signal channel 3 of the first antenna 2a. The SAR detection device of the present application may also include other antennas other than the at least two antennas 2, for example, may also include another group of antennas, and the group of antennas may also be connected by corresponding connection lines and connected to the SAR sensor 1 through a shared signal channel; At least one third antenna 5 may also be included, and each third antenna 5 is configured with a corresponding signal channel 6. Figures 1 to 6 show examples of the third antenna 5, in these examples, only one The third antenna 5, which is placed close to the SAR sensor 1, can make its corresponding signal channel 6 include only the sensing channel; of course, the signal channel 6 of the third antenna can also include both the sensing channel and the reference channel.

"The connection between the at least two antennas 2 through the connection line 4" can have various connection methods, as long as the connection is through the connection line 4 between the at least two antennas 2, the DC signals of the at least two antennas 2 can be connected by The signal channel 3 of the first antenna 2 a can be transmitted to the SAR sensor 1 . For example, when the number of the antennas 2 is multiple, the multiple antennas 2 can be connected in series by using the connecting line 4. The connecting line 4 can have only one but includes a plurality of contacts respectively connected to the antennas 2. The connecting line 4 It can also include multiple, and each connecting line 4 is connected between two antennas 2 respectively, so that the multiple antennas 2 are connected in series; the second antenna 2b can also be connected to the first antenna 2a by using the connecting line 4 respectively, or The second antenna 2b may be divided into two groups and connected to the first antenna 2a respectively; and so on. Among them, FIG. 1 to FIG. 6 respectively show several simple examples of the connection through the connection line 4 when the number of the antennas 2 is two, three and N.

"The connection line 4 blocks the transmission of the AC signal" means that the AC signal of the two antennas 2 directly connected with the connection line 4 can be blocked by the connection line 4 therebetween.

The present application uses the connection line 4 to connect at least two antennas 2, and the connection line 4 allows the DC signal to pass through, so that the DC signal of each antenna 2 can be transmitted to the SAR sensor 1 using the signal channel 3 of the first antenna 2a, that is, The SAR sensor 1 can realize DC signal transmission with at least two antennas 2 by using the signal channel 3 of the first antenna 2a, so that a larger number of radiating antennas can be connected under the condition that the number of signal channels 3 of the SAR sensor 1 is the same, Conducive to cost reduction. Moreover, since the connection line 4 can block the AC signal, each antenna 2 can maintain the independence when working as a radiating antenna itself.

Please refer to FIG. 1 to FIG. 6 , an inductance L is provided on the connecting line 4 . By arranging the inductance L on the connecting line 4, the transmission of the DC signal in the connecting line 4 and the transmission of the AC signal of the isolated antenna 2 can be realized by using the characteristics of the inductance L itself to "block traffic and direct traffic" and "pass high and low resistance". The method is simple and easy to implement. Specifically, an inductance L is provided on the connecting line 4 between any two adjacent antennas 2 .

"Two adjacent antennas 2" means that the two antennas 2 are directly connected by the connection line 4, and no other antennas 2 are connected between them. For one of the antennas 2, the other antenna 2 is the adjacent antenna. 2. The two antennas 3 form two adjacent antennas 2. For example, in the example of FIG. 5 , any two antennas 2 constitute two adjacent antennas 2 .

Specifically, the position of the connection line 4 between the two adjacent antennas 2 is within the preset value of the two adjacent antennas 2 (that is, the position within the preset value of the connection point between the connection line 4 and the antenna 2 ) respectively. There is an inductance L.

Since the connection lines 4 between the two adjacent first antennas 2 are respectively provided with inductances L at positions within the preset value of the two adjacent antennas 2, it is beneficial to prevent the connection lines 4 from forming the radiation branches of the antennas 2. The effect of the antenna 2 as a radiation antenna can be guaranteed.

Further, the distance between the inductor L and the adjacent first antenna 2 is preferably not more than 2 mm.

Specifically, the inductance L can be adjusted according to the working frequency band of the antenna 2 , so as to be able to block the AC signal of the first antenna 2 .

It should be noted that, in order to realize the purpose that the connection line 4 can pass the DC signal and can block the AC signal of the first antenna 2, it is not limited to set the inductance L on the connection line 4, any person skilled in the art can think of it can be achieved. The technical means for the above-mentioned purposes should all fall within the protection scope of the present application.

1 to 6, the antenna 2 includes an antenna body 21, a feeder branch 22 and a grounding branch 23 connected to the antenna body 21; the antenna 2 uses the feeder branch 22 and/or the grounding branch 23 to connect with a connection line 4 connections. By using the feed branch 22 and/or the ground branch 23 of the antenna 2 to be connected to the connection line 4 , the connection between the connection line 4 and the antenna 2 is facilitated. Of course, the connection between the connection line 4 and the antenna 2 is not limited to the connection with the feed branch 22 and/or the ground branch 23 of the antenna 2 .

FIG. 1 to FIG. 4 show several examples of the connection manners of the connection line 4 and the two antennas 2 when the number of the antennas 2 is two. Wherein, in FIG. 1, the connecting lines 4 are respectively connected to the grounding branches 23 of the two antennas 2; in FIG. 2, the connecting lines 4 are respectively connected to the feeding branches 22 of the two antennas 2; in FIG. 3 and FIG. 4, the connecting line 4 is connected between the ground branch 23 of one of the two antennas 2 and the feed branch 22 of the other of the two antennas 2 . Of course, the manner in which the connection line 4 and the two antennas 2 are connected is not limited to the above example.

FIG. 5 shows an example of the connection manner of the connection line 4 and the three antennas 2 when the number of the antennas 2 is three. In this example, the three antennas 2 are connected in series using the connecting line 4, and the three antennas 2 are respectively connected to the connecting line 4 through the grounding branch 23 thereof. Of course, when there are three antennas 2, the connection method between the connection line 4 and the three antennas 2 is not limited to the above example, and any one of the three antennas 2 can either select the ground branch 23 to be connected to the connection line 4, or select The feeding branch 22 is connected to the connecting line 4; the two second antennas 2b can also be directly connected to the first antenna 2a by using the connecting line 4 respectively, or can be connected to the feeding branch 22 or the grounding branch of the first antenna 2a at the same time The circuit 23 can also be connected to the feeding branch 22 and the grounding branch 23 of the first antenna 2a, respectively, and is of course not limited to being connected to the feeding branch 22 and/or the grounding branch 23.

In the examples shown in FIGS. 1 to 6 , the signal channel 3 is connected to the ground branch 23 of the first antenna 2a, but it is not limited to this, and may also be connected to the feed branch 22 of the first antenna 2a or other locations.

Referring to FIGS. 2 to 4 , the feeding branch 22 of the antenna 2 is provided with a first capacitor C1 , and the connection line 4 is connected between the first capacitor C1 and the antenna body 21 . For the antenna 2, the first capacitor C1 can play the role of blocking DC, and connecting the connecting line 4 between the first capacitor C1 and the antenna main body 21 can ensure the smooth transmission of the DC signal.

Of course, the present application does not limit each antenna 2 to be connected to the connection line 4 in this manner.

Referring to FIGS. 1 , 3 and 4 , the grounding branch 23 of the antenna 2 is provided with a second capacitor C2 , and the connecting line 4 is connected between the second capacitor C2 and the antenna body 21 . For the antenna 2, the second capacitor C2 can play the role of blocking DC, and connecting the connecting line 4 between the second capacitor C2 and the antenna body 21 can ensure the smooth transmission of the DC signal.

Of course, the present application does not limit each antenna 2 to be connected to the connection line 4 in this manner.

Specifically, the first capacitor C1 and the second capacitor C2 are arranged on a circuit board (not shown), and the circuit board is also provided with a matching position for connecting the signal feed pin of the antenna body 21 and the ground feed pin, and the connection line 4 can be It is connected to the matching bit, and can also be connected to other matching bits between the first capacitor C1 or the second capacitor C2 and the matching bit.

In order to completely avoid mutual interference between the antennas 2 , the AC signals in the entire operating frequency range of the two adjacent antennas 2 are blocked by the connecting lines 4 connected between the two adjacent antennas 2 . Of course, it is not limited to this, as long as each antenna 2 can operate independently as a radiating antenna.

Referring to FIGS. 1 to 6 , the signal channel 3 includes a sensing channel 31 and a reference channel 32 , and the sensing channel 31 and the reference channel 32 together form a differential signal channel 3 . Of course, it is not limited to this.

Please refer to FIG. 1 to FIG. 6 , the present application further discloses an electronic device, including the SAR detection device described in the above embodiments. The electronic device may be a mobile terminal such as a mobile phone and a tablet, or may be other terminals, such as a base station. The electronic device may include more than one SAR detection device (as shown in Figure 6).

The above disclosures are only the preferred embodiments of the present application, and certainly cannot limit the scope of the rights of the present application. Therefore, equivalent changes made according to the patent scope of the present application are still within the scope of the present application.

Claims (10)

1. A SAR detection device, comprising:

an SAR sensor;

At least two antennas, the at least two antennas include first antenna and second antenna, connect through the signal channel between the first antenna and the SAR sensor, connect through the connecting line between the at least two antennas, the connecting line is configured to allow direct current signal transmission and block alternating current signal transmission.

2. The SAR detection device according to claim 1, characterized in that the connection line is provided with an inductance.

3. The SAR detection device of claim 2,

the connecting lines between two adjacent antennas are respectively provided with the inductors at positions within a preset distance from the two adjacent antennas.

4. The SAR detection device according to claim 2 or 3, characterized in that the distance between the inductance and the adjacent antenna does not exceed 2 mm.

5. The SAR detection device of claim 1,

the antenna comprises an antenna main body, and a feed branch and a grounding branch which are connected with the antenna main body;

the antenna is connected with the connecting line by the feeding branch and/or the grounding branch.

6. The SAR detection device of claim 5,

The feed branch is provided with a first capacitor, and the connecting line is connected between the first capacitor and the antenna body.

7. The SAR detection device of claim 5,

and a second capacitor is arranged on the grounding branch, and the connecting line is connected between the second capacitor and the antenna main body.

8. The SAR detection device of claim 1,

alternating current signals within the whole working frequency range of two adjacent antennas are blocked by the connecting line connected between the two adjacent antennas.

9. The SAR detection device of any one of claims 1 to 8,

the signal channels include a sense channel and a reference channel.

10. An electronic device, characterized in that it comprises a SAR detection device according to any one of claims 1 to 9.

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