Terminal device for reducing SAR (Synthetic Aperture Radar) value of antenna

Abstract

The utility model discloses a terminal device capable of reducing an antenna SAR value, comprising a housing which is internally provided with a circuit board, a satellite antenna, a cellular antenna, a cellular network module, a control module, a detection module and a satellite communication module. The cellular network module is connected with the satellite antenna, the control module and the detection module; the satellite communication module is connected with the control module and the detection module. The detection module is connected with the cellular antenna and the control module. The detection module detects the approaching state of a human body and outputs a corresponding interrupt signal to the cellular network module and the satellite communication module; when the satellite communication module works, an interrupt signal is fed back to the control module, and the control module outputs a corresponding control instruction to control the satellite communication module to reduce the SAR value. On the basis of not additionally adding an SAR sensor and not increasing the hardware cost, the function of reducing the SAR value is realized.

Description

Technical Field

[0001] The utility model relates to the field of communication technologies, and particularly to a terminal device for reducing the SAR value of an antenna. Background Art

[0002] With the rapid development of global satellite communication technologies, the satellite communication function of consumer mobile phones has been gradually popularized, and satellite communication antenna technologies have also been continuously advancing. While achieving high-efficiency communication, it is necessary to consider human safety issues, especially the issue of Specific Absorption Rate (SAR). SAR refers to the electromagnetic wave energy absorbed by the human body per unit time. An excessively high SAR value poses potential health risks to the human body. Mobile phones need to test the SAR value when doing network access certification. Therefore, while implementing satellite communication, it is necessary to reduce the SAR value to ensure human safety and ensure passing the certification test.

[0003] Existing mobile phones need to add an antenna for satellite signal transmission and reception when adding satellite communication. The conventional method for reducing the SAR value is to add a SAR sensor near this antenna. The SAR sensor can send an interrupt signal to the CPU when detecting the approach of the human body. After receiving the interrupt signal, the CPU controls the satellite communication module to reduce the transmission power during operation. However, adding a SAR sensor will increase costs and occupy space on the circuit board.

[0004] Therefore, the existing technologies still need to be improved. Summary of the Utility Model

[0005] In view of the deficiencies of the above-mentioned existing technologies, the purpose of the present utility model is to provide a terminal device for reducing the SAR value of an antenna, so as to solve the problem that adding a SAR sensor for reducing the SAR value in the prior art leads to an increase in costs and space.

[0006] To achieve the above purpose, the present utility model adopts the following technical solutions:

[0007] A terminal device for reducing the SAR value of an antenna includes a housing, wherein a circuit board, a satellite antenna, and a cellular antenna are arranged inside the housing. A cellular network module is arranged on the circuit board. Among them, a control module, a detection module, and a satellite communication module are also arranged on the circuit board; the cellular network module is connected to the satellite antenna, the control module, and the detection module; the satellite communication module is connected to the control module and the detection module, and the detection module is connected to the cellular antenna and the control module;

[0008] The detection module detects the approach state of the human body and outputs a corresponding interrupt signal to the cellular network module and the satellite communication module; when the satellite communication module is working, it feeds back the interrupt signal to the control module, and the control module outputs a corresponding control instruction to control the satellite communication module to reduce the SAR value.

[0009] In the terminal device for reducing the antenna SAR value, the satellite antenna and the cellular antenna are arranged adjacent to each other at the top of the terminal device.

[0010] In the terminal device for reducing the antenna SAR value, the control module includes a CPU. The MIPI_M_SCLK pin and the MIPI_M_SDATA pin of the CPU are both connected to the cellular network module. The UTXD1 pin and the URXD1 pin of the CPU are both connected to the satellite communication module. The SCL1 pin and the SDA1 pin of the CPU are both connected to the detection module.

[0011] In the terminal device for reducing the antenna SAR value, the cellular network module includes a cellular network transceiver chip. The MIPI_S_SCLK pin of the cellular network transceiver chip is connected to the MIPI_M_SCLK pin of the CPU. The MIPI_S_SDATA pin of the cellular network transceiver chip is connected to the MIPI_M_SDATA pin of the CPU. The BPI_BUS3 pin of the cellular network transceiver chip is connected to the detection module.

[0012] In the terminal device for reducing the antenna SAR value, the satellite communication module includes a satellite communication transceiver chip. The GPIO3 pin of the satellite communication transceiver chip is connected to the UTXD1 pin of the CPU. The GPIO4 pin of the satellite communication transceiver chip is connected to the URXD1 pin of the CPU. The RTC_GPIO0 pin of the satellite communication transceiver chip is connected to the detection module.

[0013] In the terminal device for reducing the antenna SAR value, the detection module includes a SAR sensor, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor, and a third inductor;

[0014] The VCC pin of the SAR sensor is connected to the power supply terminal. The SCL pin and the SDA pin of the SAR sensor are connected to the SCL1 pin and the SDA1 pin of the CPU one by one. The INTN pin of the SAR sensor is connected to one end of the first resistor and one end of the second resistor. The other end of the first resistor is connected to the BPI_BUS3 pin of the cellular network transceiver chip. The other end of the second resistor is connected to the RTC_GPIO0 pin of the satellite communication transceiver chip. The CS0 pin of the SAR sensor is connected to one end of the first capacitor, the first main feed point of the cellular antenna, and the second main feed point of the cellular antenna. The CS1 pin of the SAR sensor is grounded through the fourth capacitor. The other end of the first capacitor is grounded through the first inductor. One end of the second capacitor is connected to the first ground feed point of the cellular antenna. The other end of the second capacitor is grounded through the second inductor. One end of the third capacitor is connected to the second ground feed point of the cellular antenna. The other end of the third capacitor is grounded through the third inductor.

[0015] In the terminal device for reducing the antenna SAR value, the detection module further includes a third resistor, a fourth resistor, a fourth inductor, and a fifth inductor;

[0016] One end of the fourth inductor is connected to the CS0 pin of the SAR sensor through the third resistor, the other end of the fourth inductor is connected to one end of the first capacitor, one end of the fifth inductor is connected to the CS1 pin of the SAR sensor through the fourth resistor, and the other end of the fifth inductor is grounded through the fourth capacitor.

[0017] In the terminal device for reducing the antenna SAR value, the detection module further includes a fifth resistor and a fifth capacitor;

[0018] One end of the fifth resistor is connected to the other end of the first capacitor, and the other end of the fifth resistor is grounded through the fifth capacitor.

[0019] In the terminal device for reducing the antenna SAR value, the detection module further includes a sixth resistor and a sixth capacitor. One end of the sixth resistor is connected to one end of the sixth capacitor and the VCC pin of the SAR sensor, the other end of the sixth resistor is connected to the power supply terminal, and the other end of the sixth capacitor is grounded.

[0020] In the terminal device for reducing the antenna SAR value, the detection module further includes a seventh resistor. One end of the seventh resistor is connected to one end of the first capacitor, and the other end of the seventh resistor is connected to the other end of the fourth inductor.

[0021] Compared with the prior art, the terminal device for reducing the antenna SAR value provided by the present invention includes a housing, and a circuit board, a satellite antenna, a cellular antenna, a cellular network module, a control module, a detection module, and a satellite communication module are arranged in the housing; the cellular network module is connected to the satellite antenna, the control module, and the detection module; the satellite communication module is connected to the control module and the detection module, and the detection module is connected to the cellular antenna and the control module; the detection module detects the proximity state of the human body and outputs a corresponding interrupt signal to the cellular network module and the satellite communication module; when the satellite communication module works, it feeds back the interrupt signal to the control module, and the control module outputs a corresponding control instruction to control the satellite communication module to reduce the SAR value. On the basis of not additionally increasing SAR sensors and without increasing hardware costs, the function of reducing the SAR value is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural block diagram of the terminal device for reducing the antenna SAR value provided by the present invention.

[0023] Figure 2 is a circuit diagram of the cellular network module, the control module, and the satellite communication module provided by the present invention.

[0024] Figure 3This is the circuit diagram of the detection module and the cellular antenna provided by the present utility model. Detailed implementation manners

[0025] The present utility model provides a terminal device for reducing the SAR value of an antenna. To make the objectives, technical solutions and advantages of the present utility model clearer and more definite, the following further elaborates on the present utility model with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] Please refer to Figure 1 、 Figure 2 and Figure 3 simultaneously. A terminal device for reducing the SAR value of an antenna provided by the present utility model includes a housing, and a circuit board, a satellite antenna 10 and a cellular antenna 20 are arranged inside the housing; a control module 30, a detection module 40, a cellular network module 50 and a satellite communication module 60 are arranged on the circuit board; the cellular network module 50 is connected to the satellite antenna 10, the control module 30 and the detection module 40; the satellite communication module 60 is connected to the control module 30 and the detection module 40, and the detection module 40 is connected to the cellular antenna 20 and the control module 30. The detection module 40 detects the proximity state of a human body and outputs a corresponding interruption signal to the cellular network module 50 and the satellite communication module 60; when the satellite communication module 60 is working, it feeds back the interruption signal to the control module 30, and the control module 30 outputs a corresponding control instruction to control the satellite communication module 60 to reduce the SAR value. When the cellular network module 50 is working, it performs existing operation functions according to the interruption signal.

[0027] Based on the requirement that the satellite antenna 10 be aligned with the sky, it is conventionally arranged at the top of the terminal device, and the cellular antenna 20 is also usually arranged at the top of the terminal device, and the two antennas are arranged adjacent to each other; and the cellular network module 50 and the satellite communication module 60 do not work simultaneously. Since the two antennas are relatively close to each other, the existing detection module 40 used in conjunction with the cellular antenna 20 can be utilized to detect whether a human body is approaching. When approaching, it indicates that the human body is also approaching the satellite antenna 10. According to the interruption signal output by the detection module 40 when detecting the approach of a human body, the control module sends a corresponding power reduction command to control the satellite communication module to reduce the SAR value, so that the function of reducing the SAR value can be realized without additionally increasing an SAR sensor and without increasing the hardware cost.

[0028] Such as Figure 2As shown, the control module 30 is preferably composed of a CPU U1 of model MT6893 and its peripheral circuits. Only the improved pin connection mode of the CPU U1 is shown here. Other pin connection modes and peripheral circuits are prior arts and will not be elaborated here. The MIPI_M_SCLK pin and MIPI_M_SDATA pin of the CPU U1 are both connected to the cellular network module 50, and signals (including signals to be transmitted through the cellular antenna 20 and signals received by the cellular antenna 20) are transmitted and received between them through the MIPI_M_SCLK signal and MIPI_M_SDATA signal. The UTXD1 pin and URXD1 pin of the CPU U1 are both connected to the satellite communication module 60, and signals (including signals to be transmitted through the satellite antenna 10 and signals received by the satellite antenna 10) are transmitted and received between them through the UART1_TXD signal and UART1_RXD signal, and a control instruction for reducing power (such as an AT (Attention) command) is sent. The SCL1 pin and SDA1 pin of the CPU U1 are both connected to the detection module 40, and the sensors in the detection module 40 are initialized and controlled through the SCL1 signal and SDA1 signal.

[0029] The cellular network module 50 is preferably composed of a cellular network transceiver chip U2 of model MT6190 and its peripheral circuits. Only the improved pin connection mode of the cellular radio frequency transceiver chip U2 is shown here. Other pin connection modes and peripheral circuits are prior arts and will not be elaborated here. The MIPI_S_SCLK pin of the cellular network transceiver chip U2 is connected to the MIPI_M_SCLK pin of the CPU U1, the MIPI_S_SDATA pin of the cellular network transceiver chip U2 is connected to the MIPI_M_SDATA pin of the CPU U1, and the BPI_BUS3 pin of the cellular network transceiver chip U2 is connected to the detection module 40.

[0030] The satellite communication module 60 is preferably composed of a satellite communication transceiver chip U3 of model MT6825 and its peripheral circuits. Only the improved pin connection mode of the satellite communication transceiver chip U3 is shown here. Other pin connection modes and peripheral circuits are prior arts and will not be elaborated here. The GPIO3 pin of the satellite communication transceiver chip U3 is connected to the UTXD1 pin of the CPU U1, the GPIO4 pin of the satellite communication transceiver chip U3 is connected to the URXD1 pin of the CPU, and the RTC_GPIO0 pin of the satellite communication transceiver chip U3 is connected to the detection module 40.

[0031] As Figure 3As shown, the detection module 40 includes a SAR sensor U4 (preferably of model AW96103), a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first inductor L1, a second inductor L2, and a third inductor L3; the VCC pin of the SAR sensor U4 is connected to the power supply terminal (providing the power supply voltage VIO18_PMU); the SCL pin and SDA pin of the SAR sensor U4 are connected one-to-one to the SCL1 pin and SDA1 pin of the CPU U1; the INTN pin of the SAR sensor U4 is connected to one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected to the BPI_BUS3 pin of the cellular network transceiver chip U2, and the other end of the second resistor R2 is connected to the RTC_GPIO0 pin of the satellite communication transceiver chip U3; the CS0 pin of the SAR sensor U4 is connected to one end of the first capacitor C1, the first main feed point ANT1 of the cellular antenna 20, and the second main feed point ANT2 of the cellular antenna 20, the CS1 pin of the SAR sensor U4 is grounded through the fourth capacitor C4, the other end of the first capacitor C1 is grounded through the first inductor L1, one end of the second capacitor C2 is connected to the first ground feed point ANT3 of the cellular antenna 20, the other end of the second capacitor C2 is grounded through the second inductor L2, one end of the third capacitor C3 is connected to the second ground feed point ANT4 of the cellular antenna 20, and the other end of the third capacitor C3 is grounded through the third inductor L3.

[0032] Among them, the first capacitor C1, the second capacitor C2, and the third capacitor C3 are used to isolate the cellular antenna 20 from the ground, and the first inductor L1, the second inductor L2, and the third inductor L3 are used for filtering. The reference signal SAR_DETECT_CS1_RDX on the CS1 pin of the SAR sensor U4 is a reference value. When a human body approaches, it will cause a change in the capacitance value of the cellular antenna, and the detection signal SAR_DETECT_CS0_RDX will change accordingly (such as the voltage value increasing). The SAR sensor U4 can determine whether a human body is approaching by comparing the detection signal SAR_DETECT_CS0_RDX with the reference signal SAR_DETECT_CS1_RDX. For example, when a human body is approaching, the voltage of the detection signal SAR_DETECT_CS0_RDX is greater than the reference signal SAR_DETECT_CS1_RDX, and the trigger signal output by the INTN pin of the SAR sensor U4 is converted into a cellular interrupt signal SAR_INIT through the first resistor R1 and transmitted to the cellular network transceiver chip U2, and the trigger signal is converted into a satellite interrupt signal SAR_EINT_MT6825 through the second resistor R2 and transmitted to the satellite communication transceiver chip U3. The trigger signal is generally a change in a level. For example, it was originally a low level and becomes a high level after being triggered, which means a trigger signal is issued.

[0033] Preferably, the detection module 40 further includes a third resistor R3, a fourth resistor R4, a fourth inductor L4, and a fifth inductor L5; one end of the fourth inductor L4 is connected to the CS0 pin of the SAR sensor U4 through the third resistor R3, the other end of the fourth inductor L4 is connected to one end of the first capacitor C1, one end of the fifth inductor L5 is connected to the CS1 pin of the SAR sensor U4 through the fourth resistor R4, and the other end of the fifth inductor L5 is grounded through the fourth capacitor C4. Among them, the third resistor R3 and the fourth inductor L4 are used to filter out jitter and interference on the detection signal SAR_DETECT_CS0_RDX; the fourth resistor R4 and the fifth inductor L5 are used to filter out jitter and interference on the reference signal SAR_DETECT_CS1_RDX.

[0034] Preferably, the detection module 40 further includes a fifth resistor R5 and a fifth capacitor C5; one end of the fifth resistor R5 is connected to the other end of the first capacitor C1, and the other end of the fifth resistor R5 is grounded through the fifth capacitor C5. The combination of C1, L1, R5, and C5 is used for impedance matching of the cellular antenna 20.

[0035] Preferably, the detection module 40 further includes a sixth resistor R6 and a sixth capacitor C6. One end of the sixth resistor R6 is connected to one end of the sixth capacitor C6 and the VCC pin of the SAR sensor U4, the other end of the sixth resistor R6 is connected to the power supply terminal, and the other end of the sixth capacitor C6 is grounded. Among them, the sixth resistor R6 is used for current limiting protection of the SAR sensor U4, and the sixth capacitor C6 is used for filtering the supply voltage VIO18_PMU to make the power supply more stable.

[0036] Preferably, the detection module 40 further includes a seventh resistor R7. One end of the seventh resistor R7 is connected to one end of the first capacitor C1, and the other end of the seventh resistor R1 is connected to the CS0 pin of the SAR sensor U4 or the other end of the fourth inductor L4. The seventh resistor R7 is used for electrostatic protection.

[0037] Please continue to refer to Figure 2 and Figure 3 , based on the fact that the cellular network module 50 and the satellite communication module 60 will not work simultaneously, when one of the two modules works, the other does not work. When the satellite communication module 60 works and it is necessary to reduce the SAR value when a human body is detected, the working principle of the terminal device is as follows:

[0038] When the satellite communication module 60 is working and the cellular network module 50 is not working, if a human body approaches the cellular antenna 20 (the detection distance is generally 10 mm), the capacitance value of the cellular antenna changes. At this time, the SAR sensor U4 determines that the voltage value of the detection signal SAR_DETECT_CS0_RDX is larger than that of the reference signal SAR_DETECT_CS1_RDX. The trigger signal output from the INTN pin is converted into a cellular interruption signal SAR_INIT through the first resistor R1 and transmitted to the cellular network transceiver chip U2, and the trigger signal is converted into a satellite interruption signal SAR_EINT_MT6825 through the second resistor R2 and transmitted to the satellite communication transceiver chip U3. Based on the fact that the satellite communication module 60 is working at this time, after receiving the satellite interruption signal SAR_EINT_MT6825, it notifies the CPU that it is necessary to reduce the power through the UART1_TXD signal and the UART1_RXD signal. The CPU then sends a control instruction to reduce the power to the satellite communication transceiver chip U3 through the UART1_TXD signal and the UART1_RXD signal. The satellite communication transceiver chip U3 decreases by a preset value according to the control instruction, thereby meeting the requirement of reducing the SAR value.

[0039] When the cellular network module 50 is working and the satellite communication module 60 is not working, after receiving the cellular interruption signal SAR_INIT, the cellular network transceiver chip U2 performs existing controls.

[0040] In specific implementation, the cellular antenna 20 can also be replaced with other types of antennas, such as a WIFI antenna. There is a SAR sensor on this antenna, and it can share this SAR sensor with the satellite communication module 60. In this embodiment, one SAR sensor is shared, and it does not exclude sharing two or more existing SAR sensors.

[0041] In summary, for the terminal device for reducing the SAR value of the antenna of the present utility model, a SAR sensor is shared by the cellular network module and the satellite communication module through a corresponding circuit structure. The satellite communication module uses the SAR sensor on the cellular antenna to detect whether a human body is approaching. When approaching, it controls the satellite communication module to reduce the SAR value, without the need to add a new SAR sensor. Although some components such as resistors and capacitors are used when improving the circuit, their costs are much cheaper than those of SAR sensors, saving hardware costs, occupying very little space on the circuit board, and also achieving the function of reducing the SAR value.

[0042] It should be understood that the application of the present utility model is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description. All such improvements and transformations should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A terminal device for reducing antenna SAR value, comprising a housing, a circuit board, a satellite antenna and a cellular antenna are arranged in the housing, and a cellular network module is arranged on the circuit board, characterized in that: The circuit board is also provided with a control module, a detection module and a satellite communication module; the cellular network module is connected to the satellite antenna, the control module and the detection module; the satellite communication module is connected to the control module and the detection module, and the detection module is connected to the cellular antenna and the control module; The detection module detects the approaching state of the human body and outputs a corresponding interrupt signal to the cellular network module and the satellite communication module; when the satellite communication module is working, the interrupt signal is fed back to the control module, and the control module outputs a corresponding control instruction to control the satellite communication module to reduce the SAR value.

2. The terminal device for reducing antenna SAR value according to claim 1, characterized in that: The satellite antenna and the cellular antenna are arranged on the top of the terminal device and are adjacent to each other.

3. The terminal device for reducing antenna SAR value according to claim 2, characterized in that: The control module includes a CPU, a MIPI_M_SCLK pin and a MIPI_M_SDATA pin of the CPU are both connected to a cellular network module, a UTXD1 pin and a URXD1 pin of the CPU are both connected to a satellite communication module, and a SCL1 pin and a SDA1 pin of the CPU are both connected to a detection module.

4. The terminal device for reducing antenna SAR value according to claim 3, characterized in that: The cellular network module includes a cellular network transceiver chip, the MIPI_S_SCLK pin of the cellular network transceiver chip is connected to the MIPI_M_SCLK pin of the CPU, the MIPI_S_SDATA pin of the cellular network transceiver chip is connected to the MIPI_M_SDATA pin of the CPU, and the BPI_BUS3 pin of the cellular network transceiver chip is connected to the detection module.

5. The terminal device for reducing antenna SAR value according to claim 4, characterized in that: The satellite communication module includes a satellite communication transceiver chip, the GPIO3 pin of the satellite communication transceiver chip is connected to the UTXD1 pin of the CPU, the GPIO4 pin of the satellite communication transceiver chip is connected to the URXD1 pin of the CPU, and the RTC_GPIO0 pin of the satellite communication transceiver chip is connected to the detection module.

6. The terminal device for reducing antenna SAR value according to claim 5, characterized in that: The detection module includes a SAR sensor, a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor and a third inductor; The VCC pin of the SAR sensor is connected to the power supply end; the SCL pin and SDA pin of the SAR sensor are connected one-to-one with the SCL1 pin and SDA1 pin of the CPU; the INTN pin of the SAR sensor is connected to one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected to the BPI_BUS3 pin of the cellular network transceiver chip, and the other end of the second resistor is connected to the RTC_GPIO0 pin of the satellite communication transceiver chip; the CS0 pin of the SAR sensor is connected to one end of the first capacitor, the first main feeding point of the cellular antenna and the second main feeding point of the cellular antenna, the CS1 pin of the SAR sensor is grounded through a fourth capacitor, the other end of the first capacitor is grounded through a first inductor, one end of the second capacitor is connected to the first ground feeding point of the cellular antenna, the other end of the second capacitor is grounded through a second inductor, one end of the third capacitor is connected to the second ground feeding point of the cellular antenna, and the other end of the third capacitor is grounded through a third inductor.

7. The terminal device for reducing antenna SAR value according to claim 6, characterized in that: The detection module also includes a third resistor, a fourth resistor, a fourth inductor and a fifth inductor; One end of the fourth inductor is connected to the CS0 pin of the SAR sensor through the third resistor, the other end of the fourth inductor is connected to one end of the first capacitor, one end of the fifth inductor is connected to the CS1 pin of the SAR sensor through the fourth resistor, and the other end of the fifth inductor is grounded through the fourth capacitor.

8. The terminal device for reducing antenna SAR value according to claim 6, characterized in that: The detection module also includes a fifth resistor and a fifth capacitor; One end of the fifth resistor is connected to the other end of the first capacitor, and the other end of the fifth resistor is grounded through the fifth capacitor.

9. The terminal device for reducing antenna SAR value according to claim 6, characterized in that: The detection module also includes a sixth resistor and a sixth capacitor, one end of the sixth resistor is connected to one end of the sixth capacitor and the VCC pin of the SAR sensor, the other end of the sixth resistor is connected to the power supply end, and the other end of the sixth capacitor is grounded.

10. The terminal device for reducing antenna SAR value according to claim 7, characterized in that: The detection module further includes a seventh resistor, one end of the seventh resistor is connected to one end of the first capacitor, and the other end of the seventh resistor is connected to the other end of the fourth inductor.

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