Radio frequency circuit of antenna matching circuit

Abstract

The utility model provides a radio frequency circuit of an antenna matching circuit, which relates to the technical field of antenna matching and comprises a radio frequency module and a receiving module, the receiving module is connected with a matching module, and the radio frequency module is connected with an amplifying module. The matching module comprises a matching unit and a filtering unit. According to the utility model, in the use process of the matching unit and the filtering unit, the detection unit calculates real-time heat of capacitors or inductors in the matching unit and the filtering unit in real time through a formula and receives and processes the real-time heat, and then the power supply unit supplies power to the compensation unit; the self temperature characteristic of the compensation unit compensates the temperature change of the matching unit and the filtering unit, counteracts the capacitance or inductance parameter change caused by temperature rise, stabilizes the circuit performance, ensures that the antenna matching circuit keeps a good working state, guarantees the accuracy and stability of signal processing, and improves the reliability of the antenna matching circuit. Meanwhile, power supply to the compensation unit is automatically started and stopped by the control unit, and energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of antenna matching technology, and in particular to a radio frequency circuit for an antenna matching circuit. Background Technology

[0002] With the development of wireless technology, wireless electronic devices are widely favored by consumers, and consumers have increasingly higher requirements for the performance of wireless electronic devices. At present, in wireless communication systems, wideband, multi-frequency, and multi-antenna terminal products have become very popular. It is generally believed that the input impedance of the antenna is a constant.

[0003] In the prior art, such as Chinese patent CN219329753U, an antenna matching circuit and a radio frequency (RF) circuit are disclosed. The antenna matching circuit is applicable to the RF circuit, which includes an antenna, a shielding layer, and a control circuit for controlling the antenna's operation. The antenna matching circuit is on a separate circuit board from the antenna, shielding layer, and control circuit. The circuit board has: several grounding units for electrically connecting different grounding positions of the shielding layer; several grounding matching units corresponding to the grounding units for adjusting grounding matching parameters, with each grounding matching unit electrically connected to ground; and an antenna matching unit for adjusting antenna matching parameters, with its first end electrically connected to the antenna and its second end electrically connected to the control circuit. This utility model can adjust the antenna matching parameters of the RF circuit without changing the circuit structure of the control circuit, thereby improving the operating stability and reliability of the RF circuit and reducing the development cost of upgrading the RF circuit.

[0004] The aforementioned patent allows for adjustment of the antenna matching parameters of the RF circuit, which can improve the working stability and reliability of the RF circuit, as well as reduce the development cost of upgrading the RF circuit. However, during use, the components in the circuit generate heat, which increases the dielectric loss of the capacitor and the resistance of the inductor coil, changing the reactance values ​​of the capacitor and inductor, thereby affecting the frequency response of the filter and degrading the signal quality. Utility Model Content

[0005] The purpose of this invention is to solve the problem in the prior art where, during operation, components in the circuit generate heat, leading to increased dielectric loss of capacitors and increased resistance of inductor coils, which alters the reactance values ​​of capacitors and inductors, thereby affecting the frequency response of filters and degrading signal quality. Therefore, this invention proposes an RF circuit for antenna matching.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an RF circuit for an antenna matching circuit, comprising an RF module and a receiving module, wherein the receiving module is connected to a matching module and the RF module is connected to an amplification module;

[0007] The matching module includes a matching unit and a filtering unit, and the matching unit and the filtering unit are connected to a temperature control module.

[0008] The temperature control module includes a detection unit, which is connected to a control unit. The control unit is connected to a power supply unit, and the power supply unit is connected to a compensation unit.

[0009] Preferably, the amplification module is connected to the matching module, and the amplification module includes a preprocessing unit and an amplification unit;

[0010] The preprocessing unit includes a correction unit, which is connected to a signal conversion unit. The correction unit is used to correct the waveform of the signal, and the signal conversion unit is used to convert and change the signal.

[0011] Preferably, the detection unit is connected in series with the matching unit and the filtering unit, and the detection unit calculates the real-time temperature of the matching unit and the filtering unit in real time using a formula.

[0012] Preferably, the detection unit is an NTC thermistor and the compensation unit is a PTC resistor.

[0013] Preferably, the detection formula of the detection unit is as follows:

[0014] ;

[0015] in This is the resistance value of the NTC thermistor at temperature T. This is the resistance value at the reference temperature T0, B

[0016] The material constants of the NTC thermistor;

[0017] ;

[0018] in The voltage across the NTC thermistor is... By measuring Then, by substituting into the exponential formula of S1, the temperature T can be calculated.

[0019] Preferably, one end of the compensation unit is connected in series with the matching unit and the filtering unit, and the other end of the compensation unit is connected to the control unit.

[0020] Preferably, an RF circuit provides an antenna matching circuit.

[0021] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0022] 1. In this utility model, during the use of the matching unit and the filtering unit, the detection unit will detect the real-time heat of the capacitors or inductors in the matching unit and the filtering unit, calculate it using a formula, process it, and then supply power to the compensation unit through the power supply unit. The temperature characteristics of the compensation unit itself will compensate for the temperature changes of the matching unit and the filtering unit, offsetting the changes in capacitor or inductor parameters caused by the temperature rise, stabilizing the circuit performance, ensuring that the RF circuit of the antenna matching circuit maintains a good working state, and ensuring the accuracy and stability of signal processing. At the same time, the control unit will automatically turn the power supply to the compensation unit on and off to reduce energy consumption.

[0023] 2. In this utility model, the radio frequency unit transmits the signal to the amplification module. The waveform of the signal is corrected and shaped by the correction unit in the amplification module to make it suitable for subsequent processing and amplification. The corrected signal is converted from analog signal to digital signal by the signal conversion module and then transmitted to the amplification unit for amplification. According to the required amplification factor, an appropriate resistor value is selected to build the corresponding amplification circuit, thereby effectively amplifying the digital signal, achieving optimal impedance matching, reducing signal reflection, and improving signal transmission efficiency. Attached Figure Description

[0024] Figure 1 This utility model provides a schematic diagram of the radio frequency circuit structure of an antenna matching circuit;

[0025] Figure 2 This utility model provides a schematic diagram of the amplification module structure of the radio frequency circuit of the antenna matching circuit;

[0026] Figure 3 This utility model provides a schematic diagram of the temperature detection module structure of the radio frequency circuit of the antenna matching circuit.

[0027] Figure 4 This invention provides a partial circuit diagram of the radio frequency circuit for an antenna matching circuit. Detailed Implementation

[0028] Please see Figures 1-4A radio frequency (RF) circuit for an antenna matching circuit includes an RF module and a receiving module. The receiving module is connected to the matching module, and the RF module is connected to an amplification module. The matching module includes a matching unit and a filtering unit, which are connected to a temperature control module. The temperature control module includes a detection unit, which is connected to a control unit. The control unit is connected to a power supply unit, and the power supply unit is connected to a compensation unit. The detection unit monitors the real-time heat of the capacitors or inductors in the matching and filtering units and calculates the temperature using a formula. When the heat is below a set threshold of the control unit, the controller remains silent to reduce unnecessary energy consumption. When the heat exceeds the set threshold of the control unit, the controller receives a signal from the detection unit. The transmitted signal is processed and powered by the power supply unit to the compensation unit. After the compensation unit starts working, it compensates for the temperature changes of the matching unit and the filtering unit according to its own temperature characteristics, changes the current distribution in the matching unit and the filtering unit, and offsets the changes in capacitance or inductance parameters caused by temperature rise, stabilizes circuit performance, ensures that the RF circuit of the antenna matching circuit maintains a good working state, and ensures the accuracy and stability of signal processing. When the temperature reaches a specified threshold after compensation, the control unit will control the power supply unit to stop supplying power to the compensation unit to further reduce energy consumption. The control unit is a microcontroller, the matching unit is a π-type network or a T-type network, and the filtering unit is a low-pass filter.

[0029] The amplification module is connected to the matching module. The amplification module includes a preprocessing unit and an amplification unit. The amplification unit is a conventional amplifier in the prior art, used to amplify the signal.

[0030] The preprocessing unit includes a correction unit, which is connected to a signal conversion unit. The correction unit is used to correct the waveform of the signal, and the signal conversion unit is used to convert and change the signal. The correction unit is a conventional comparator in the prior art, and the signal conversion unit is a conventional analog-to-digital converter in the prior art.

[0031] The detection unit is connected in series with the matching unit and the filtering unit. The detection unit calculates the real-time temperature of the matching unit and the filtering unit in real time using a formula.

[0032] The detection unit is an NTC thermistor, and the compensation unit is a PTC resistor.

[0033] The detection formula for the detection unit is as follows:

[0034] ;

[0035] in This is the resistance value of the NTC thermistor at temperature T. This is the resistance value at the reference temperature T0, B

[0036] The material constants of the NTC thermistor;

[0037] ;

[0038] in The voltage across the NTC thermistor is... By measuring Substituting this into the exponential formula of S1, the temperature T can be calculated. The temperature of the matching unit and the filtering unit can be detected by the detection unit through the above detection formulas of S1 and S2.

[0039] One end of the compensation unit is connected in series with the matching unit and the filtering unit, and the other end of the compensation unit is connected to the control unit. The compensation unit will compensate for the temperature changes of the matching unit and the filtering unit according to its own temperature characteristics, so as to offset the changes in capacitance or inductance parameters caused by the temperature rise.

[0040] The usage steps of this utility model are as follows: In the attached diagram, K1, RT1, RE2, and STM32 represent the control unit, π-type network, low-pass filter, and microcontroller, respectively. In use, the RF circuit of this antenna matching circuit receives external signals through the RF unit and then transmits the signals to the amplification module. The correction unit in the amplification module corrects and shapes the waveform of the signal to make it suitable for subsequent processing and amplification. The corrected signal is then converted from an analog signal to a digital signal by the signal conversion module and transmitted to the amplification unit for amplification. According to the required amplification factor, appropriate resistor values ​​are selected to build the corresponding amplification circuit, thereby effectively amplifying the digital signal, achieving optimal impedance matching, reducing signal reflection, and improving signal transmission efficiency. The amplified signal is then transmitted to the subsequent matching module for processing. The π-type network in the matching unit matches the impedance of the amplified signal with that of the subsequent circuit. The matched signal is then filtered by the filtering unit to remove high-frequency noise, allowing only signals of specific frequency bands to pass through. The system filters out interference signals from other frequency bands to prevent them from entering the receiving module. During operation, the detection unit monitors the real-time heat of the capacitors or inductors in the matching and filtering units and calculates the heat output using a formula. When the heat output is below the control unit's set threshold, the controller remains silent to reduce unnecessary energy consumption. When the heat output exceeds the control unit's set threshold, the controller receives and processes the signal from the detection unit and supplies power to the compensation unit. Once the compensation unit starts working, it compensates for temperature changes in the matching and filtering units based on its own temperature characteristics, altering the current distribution within them to offset changes in capacitor or inductor parameters caused by temperature increases. This stabilizes circuit performance, ensures the antenna matching circuit's RF circuit maintains good operating condition, and guarantees the accuracy and stability of signal processing. When the temperature reaches a specified threshold after compensation, the control unit controls the power supply unit to stop supplying power to the compensation unit, further reducing energy consumption.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A radio frequency circuit for an antenna matching circuit, comprising: The radio frequency module and the receiving module are characterized in that: the receiving module is connected to a matching module, and the radio frequency module is connected to an amplification module; The matching module includes a matching unit and a filtering unit, and the matching unit and the filtering unit are connected to a temperature control module. The temperature control module includes a detection unit, which is connected to a control unit. The control unit is connected to a power supply unit, and the power supply unit is connected to a compensation unit.

2. The radio frequency circuit of the antenna matching circuit according to claim 1, characterized in that: The amplification module is connected to the matching module, and the amplification module includes a preprocessing unit and an amplification unit. The preprocessing unit includes a correction unit, which is connected to a signal conversion unit. The correction unit is used to correct the waveform of the signal, and the signal conversion unit is used to convert and change the signal.

3. The radio frequency circuit of the antenna matching circuit according to claim 1, characterized in that: The detection unit is connected in series with the matching unit and the filtering unit, and the detection unit calculates the real-time temperature of the matching unit and the filtering unit in real time using a formula.

4. The radio frequency circuit of the antenna matching circuit according to claim 1, characterized in that: The detection unit is an NTC thermistor, and the compensation unit is a PTC resistor.

5. The radio frequency circuit of the antenna matching circuit according to claim 3, characterized in that: The detection formula of the detection unit is as follows: ； in This is the resistance value of the NTC thermistor at temperature T. This is the resistance value at the reference temperature T0, B The material constants of the NTC thermistor; ； in The voltage across the NTC thermistor is... By measuring Then, by substituting into the exponential formula of S1, the temperature T can be calculated.

6. The radio frequency circuit of the antenna matching circuit according to claim 1, characterized in that: One end of the compensation unit is connected in series with the matching unit and the filtering unit, and the other end of the compensation unit is connected to the control unit.

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