Wireless communication circuit, system and method

Abstract

Disclosed in the present invention are a wireless communication circuit, system and method. By means of providing a direct-current bias circuit between a second port of a modulation element and a first resonant network, or between a third port of the modulation element and a second resonant network, or at a first port of the modulation element, the present solution can significantly reduce the threshold value of a microwave driving power for wireless communication, greatly expand the wireless communication distance with extremely low power consumption, and solve the problem of limited wireless communication distance in the present 5G-A and Internet-of-Things applications. Furthermore, by means of a frequency mixing function provided by the modulation element, the present invention implements inter-frequency backhaul of a microwave signal, and solves the problems in the prior art of intra-frequency blocking and limited transmission power of a reader.

Description

Wireless communication circuit, system and method TECHNICAL FIELD

[0001] The present application relates to the field of wireless communication, and more particularly, to a wireless communication circuit, system and method. BACKGROUND

[0002] In the conventional technology of realizing wireless communication by radio frequency energy, such as RFID technology, the alternating current energy of radio frequency needs to be converted into direct current energy for the subsequent circuit, and the energy conversion efficiency is greatly reduced with the decrease of input power. At present, limited by the implementation principle and the characteristics of semiconductor materials, under the condition of low input power (≤-10dBm), the RFID energy conversion efficiency is generally less than 30%, and under the condition of extremely low input power (≤-20dBm), the energy conversion efficiency is generally less than 10%. Therefore, the low energy conversion efficiency means low radio frequency power driving sensitivity, and also means high radio frequency power driving threshold, which requires the RFID reader to provide high radio frequency energy, greatly limiting the wireless communication distance in actual application. Therefore, how to realize long-distance wireless communication with passive or extremely low power consumption is a key problem faced in the current 5G-A and Internet of Things applications.

[0003] On the other hand, in the existing technology of realizing wireless communication by radio frequency energy, such as RFID technology, the radio frequency sent by the reader to the electronic tag is the same as the radio frequency returned by the electronic tag to the reader, and this technical route has the problems of same frequency blocking and limited reader transmission power, which is also one of the reasons why it cannot realize long-distance wireless communication. SUMMARY

[0004] The present application provides a wireless communication circuit, system and method, which is expected to solve at least one of the problems in the prior art.

[0005] To solve the above technical problems, one embodiment of the present application adopts the following technical scheme:

[0006] The first aspect of the present application provides a wireless communication circuit, comprising a modulation element, a first resonant network, a second resonant network and a direct current bias circuit;

[0007] The modulation element comprises a first port, a second port and a third port, and is used for mixing the first microwave signal fed in through the microwave input / output port with the oscillation signal of the second resonant frequency fed in through the second resonant network to generate a frequency conversion signal;

[0008] The first port is electrically connected with the microwave input / output port;

[0009] The second port is electrically connected with the first resonant network;

[0010] The third port is electrically connected with the second resonant network;

[0011] The direct current bias circuit is arranged between the second port and the first resonant network, or between the third port and the second resonant network, or between the first port and the microwave input / output port.

[0012] In this case, the microwave signal with the first frequency (f in ) is fed from the first port of the modulation element, and there is an electronic migration channel in the modulation element, and these electrons can form a signal transmission channel between the first port and the second port of the modulation element without the need of direct current bias, so that the fed first frequency (f in ) microwave signal can be transmitted between the first port and the second port;

[0013] And, under the action of the first resonant circuit connected with the second port, the first frequency (f in ) microwave signal realizes energy convergence near the resonant frequency of the first resonant circuit; the converged energy is fed via the second port in the modulation element to the second resonant circuit connected with the third port to generate an oscillation signal with a stable second resonant frequency (f res );

[0014] The oscillation signal is fed via the third port to the modulation element, and mixed with the fed first frequency (f in ) microwave signal in the modulation element to generate a mixed frequency signal with a second frequency (f out ), the frequency f out of the mixed frequency signal is f in ±n×f res , where n=1, 2, 3…, thereby realizing passive frequency conversion of the first frequency (f in ) microwave signal.

[0015] When the direct current bias circuit is arranged to provide direct current bias with extremely low power consumption (in the order of nanowatt to microwatt), the modulation element has a second microwave driving power threshold, which can significantly reduce the microwave driving power threshold of wireless communication, greatly expand the wireless communication distance with extremely low power consumption, and solve the problem of limited wireless communication distance in current 5G-A and Internet of Things applications. On the other hand, the scheme realizes the heterodyne backhaul of the microwave signal through the mixing function provided by the modulation element, and solves the problems of same frequency blocking and limited reader transmission power in the prior art.

[0016] Further technical solutions are that the first resonant network includes a port one and at least one second microwave signal port different from the port one, and the second resonant network includes a first port and a second port.

[0017] a first port of the first resonant network is electrically connected with a second port of the modulation element; a first port of the second resonant network is electrically connected with a third port of the modulation element, and a second port of the second resonant network is electrically connected with a second microwave signal port of the first resonant network.

[0018] In a further aspect, the DC bias circuit is a DC power supply circuit, or a circuit for converting RF energy into DC, or a circuit for converting ambient energy into DC.

[0019] In a further aspect, the first resonant network is any one of a microwave open circuit line, an LC resonant network, and an RC resonant network; and / or the second resonant network is any one of an LC resonant network and an RC resonant network.

[0020] The microwave open circuit line presents an open circuit characteristic for DC and a resonant characteristic for microwave signals. When the first resonant network is a microwave open circuit line, the second port of the modulation element is directly connected with the DC bias circuit. This arrangement has the advantage of reducing circuit elements and lowering circuit cost, and still enables energy concentration and frequency conversion, but has the disadvantage that the wireless communication circuit can only work at a single frequency point.

[0021] In a further aspect, the modulation element is a transistor with a heterojunction.

[0022] In a further aspect, the wireless communication circuit further comprises a matching circuit connected with the first port.

[0023] The matching circuit is used to achieve impedance matching between the wireless communication circuit and the microwave input / output port.

[0024] Impedance matching is used to match the frequency f in The microwave signal is introduced to the first port of the modulation element with maximum efficiency, and the microwave signal with frequency f out The microwave signal with frequency f

[0025] In a further aspect, the modulation element is a metal-oxide-semiconductor field-effect transistor or a high-electron-mobility transistor.

[0026] The first port, the second port, and the third port of the modulation element are any one of a drain, a source, and a gate, respectively.

[0027] The wireless communication circuit further comprises a sensing element.

[0028] The sensing element is configured to convert the change in the to-be-detected sensing quantity into a change in capacitance or inductance.

[0029] The sensing element is arranged at at least one of the following positions: between the third port and the second resonant network, between the second port and the first resonant network, and between the first port and the microwave input / output port.

[0030] When the to-be-detected sensing quantity changes, the sensing element senses the change in the to-be-detected sensing quantity, converts the change in the to-be-detected sensing quantity into a change in capacitance or inductance, and the change in capacitance or inductance further causes the second resonant circuit to output a second resonant frequency (f res ) that changes with the change in capacitance or inductance, so that the frequency f out of the mixed frequency signal also changes with the change in the to-be-detected sensing quantity, thereby realizing passive frequency conversion sensing of the to-be-detected sensing quantity.

[0031] Further, the sensing element is one of a sensing element for sensing a slowly-varying signal, a sensing element for sensing a transient signal, and a sensing element for sensing both a slowly-varying signal and a transient signal.

[0032] The to-be-detected sensing quantity includes, but is not limited to, one or more of the following physical quantities: temperature, pressure, vibration, humidity, voiceprint, displacement, and dielectric constant.

[0033] In a third aspect, the present application provides a wireless communication system, which comprises the wireless communication circuit, the first antenna, the second antenna, and the transceiver as described above.

[0034] The transceiver is configured to send a signal to the first antenna, receive a returned frequency conversion signal, and demodulate corresponding information according to the frequency conversion signal.

[0035] The first antenna is configured to send the first microwave signal to the second antenna and receive a returned frequency conversion signal from the second antenna.

[0036] The second antenna is configured to receive the first microwave signal, send the signal to the wireless communication circuit, and send the frequency conversion signal to the first antenna.

[0037] In a fourth aspect, the present application provides a wireless communication method, which comprises the following steps:

[0038] The transceiver sends a first microwave signal with a first frequency to the second antenna via the first antenna.

[0039] The second antenna receives the first microwave signal and sends the first microwave signal to the wireless communication circuit.

[0040] The modulation element of the wireless communication circuit mixes the fed-in first microwave signal with the oscillation signal of the second resonant frequency fed in by the second resonant network to obtain a frequency conversion signal of the second frequency, and sends the frequency conversion signal to the second antenna;

[0041] The second antenna sends the frequency conversion signal;

[0042] The first antenna receives the returned frequency conversion signal and sends it to the transceiver;

[0043] The transceiver demodulates the corresponding information according to the frequency conversion signal.

[0044] Compared with the prior art, the present application has at least the following beneficial effects: by arranging a direct current bias circuit between the second port of the modulation element and the first resonant network, or between the third port of the modulation element and the second resonant network, or at the first port of the modulation element, the microwave drive power threshold of the wireless communication can be significantly reduced, the wireless communication distance is greatly expanded with extremely low power consumption, and the problem of limited wireless communication distance in the current 5G-A and Internet of Things applications is solved. Further, the frequency conversion of the microwave signal is realized by the mixing function provided by the modulation element, the problems of same frequency blocking and limited reader transmission power in the prior art are solved, the standard setting organization is expected to relax the limitation of the reader transmission power, and under the allowed higher transmission power, the wireless communication distance of the above wireless communication circuit will be further improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] Fig. 1 is a structural schematic diagram of a wireless communication circuit according to an embodiment of the present application;

[0046] Fig. 2 is a structural schematic diagram of a wireless communication circuit according to an embodiment of the present application;

[0047] Fig. 3 is a structural schematic diagram of a wireless communication circuit according to an embodiment of the present application;

[0048] Fig. 4 is a structural schematic diagram of a wireless communication circuit according to an embodiment of the present application;

[0049] Fig. 5 is a structural schematic diagram of a wireless communication circuit according to an embodiment of the present application;

[0050] Fig. 6 is a structural schematic diagram of a wireless communication circuit according to an embodiment of the present application;

[0051] Fig. 7 is a structural schematic diagram of a wireless communication circuit according to an embodiment of the present application;

[0052] Fig. 8 is a structural schematic diagram of a wireless communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0054] In order to solve the technical problems of low energy conversion efficiency or low RF power driving sensitivity or high RF power driving threshold in wireless communication by means of RF energy, in an embodiment, a wireless communication circuit is provided, as shown in FIG. 1, comprising a modulation element, a first resonant network, a second resonant network and a DC bias circuit.

[0055] The modulation element has three ports, i.e., a first port, a second port and a third port.

[0056] The first port is used for inputting a first microwave signal having a first frequency (f in ) and outputting a second microwave signal having a second frequency (f out );

[0057] The second port of the modulation element is electrically connected with the first resonant network.

[0058] The third port of the modulation element is electrically connected with the second resonant network.

[0059] The modulation element establishes a passive transmission channel between the first port and the second port and between the second port and the third port, and is used for mixing the fed-in first microwave signal having the first frequency with an oscillation signal having a second resonant frequency (f res ) fed in by the second resonant network and outputting the mixed second signal from the first port.

[0060] In an embodiment, the first resonant network presents a resonant characteristic to the microwave signal, and the second resonant network is a resonant network having the second resonant frequency; the resonant network is any one of an LC resonant network and an RC resonant network.

[0061] In an embodiment, the DC bias circuit is connected with any one of the first port, the second port and the third port.

[0062] In an embodiment, the DC bias circuit is arranged between the second port and the first resonant network, and those skilled in the art should understand that the DC bias value provided by the DC bias circuit is determined according to the specific frequency conversion structure. According to the different modulation elements, the second port can be an emitter of a bipolar transistor or a source of a field effect transistor.

[0063] It can be understood that there is a driving power threshold for the modulating element to generate the frequency conversion signal, in other words, the frequency conversion signal is generated only when the power of the first microwave signal is not less than the power threshold. When the DC bias circuit provides the DC bias voltage with extremely low power consumption (in the order of nanowatt to microwatt), the driving power threshold for the modulating element to generate the frequency conversion signal is greatly reduced.

[0064] It can also be understood that the DC bias circuit can be any suitable configuration, for example, a DC power supply circuit (such as a battery), or a circuit that rectifies radio frequency energy into DC, or a circuit that converts environmental energy such as thermal energy, vibration energy, and light energy into DC. In any embodiment of the present application, the specific configuration of the DC bias circuit is not limited.

[0065] In an embodiment, the driving power threshold required for the modulating element to generate the frequency conversion signal before and after the addition of the DC bias is tested. When there is no DC bias, the driving power threshold of the wireless communication circuit at this time is recorded as the first microwave driving power threshold, which is -30dBm. When the DC bias circuit provides the DC bias voltage, the driving power threshold of the wireless communication circuit at this time is recorded as the second microwave driving power threshold, which can be as low as -60dBm or even lower. As can be seen, only by providing the modulating element with a DC bias with extremely low power consumption, the driving power threshold required for the modulating element to generate the frequency conversion signal is greatly reduced, and the radio frequency power driving sensitivity is greatly improved.

[0066] In an embodiment, the DC bias circuit can also be arranged at the first port of the modulating element, or between the third port of the modulating element and the second resonant network.

[0067] In an embodiment, the third port can be the base of a bipolar transistor, or the gate of a field effect transistor, according to the different modulating elements.

[0068] Figure 2 shows a wireless communication circuit according to an embodiment of the present application, which is based on any of the preceding embodiments. The first resonant network includes a first port and at least one second microwave signal port different from the first port, and the second resonant network includes a first port and a second port.

[0069] The first port of the first resonant network is electrically connected to the second port of the modulating element, the first port of the second resonant network is electrically connected to the third port of the modulating element, and the second port of the second resonant network is electrically connected to the second microwave signal port of the first resonant network.

[0070] In the above embodiment, the modulating element converts the first frequency (f inThe first microwave signal is energy-dispersed. A first resonant network is used to refocus the dispersed microwave signal to obtain a second microwave signal, which is then fed into the second resonant network without passing through a modulation element. The second resonant network performs secondary frequency selection based on the fed second microwave signal to generate a stable second resonant frequency (f). r2 The oscillation signal of the second resonant frequency (f) will be used to determine the second resonant frequency (f). r2 The oscillation signal is fed into the modulation element and has a first frequency (f) in The first microwave signal is mixed to obtain a signal with a second frequency (f). out ) frequency conversion signal.

[0071] In this embodiment, the second microwave signal reaches the second resonant network from the microwave signal transmission circuit via at least two signal transmission paths, which may partially overlap or not overlap with each other. Taking two signal transmission paths as an example, the first path is the path from the first resonant network through the modulation element to the second resonant network, and the second path is the path from the first resonant network without passing through the modulation element to the second resonant network. The first path and the second path may not overlap or may partially overlap.

[0072] With the above configuration, after the microwave signal, whose energy has been dispersed by the modulation element, is re-converged into a second microwave signal in the first resonant network, most or all of the second microwave signal will reach the second resonant network through the second path. This configuration allows the second microwave signal to reach the second resonant network with almost no loss, thereby generating an oscillation signal and a frequency conversion signal, thus outputting a higher-power frequency conversion signal and correspondingly reducing the microwave drive power threshold. It can be understood that "most" means at least half, and more specifically, 60% or more, 70% or more, or 80% or more, or 90% or more, or 95% or more.

[0073] Figure 3 illustrates a wireless communication circuit according to an embodiment of the present invention. Based on any of the foregoing embodiments, the modulation element in this embodiment includes a metal-oxide-semiconductor field-effect transistor (MOSFET), with the drain, source, and gate of the MOSFET serving as the first port, second port, and third port, respectively. The operation of the wireless communication circuit provided in this embodiment is the same as that in the foregoing embodiments, and will not be repeated here.

[0074] In this embodiment, the DC bias circuit provides a DC bias voltage of 0.3V and a current of approximately 5 microamps. The DC bias circuit is located between the second port and the first resonant network. The microwave signal transmitted by the remote transceiver has a frequency of 950MHz (i.e., the first frequency f). in The frequency of the returned microwave signal is 914MHz (i.e., the second frequency f). out The second resonant frequency (f) of the second resonant networkres The second resonant frequency (f2) of the second resonant network is 36MHz. The drive power threshold of the modulating element is -62dBm.

[0075] Figure 4 shows a wireless communication circuit according to an embodiment of the present application, which is based on any of the above embodiments, wherein the first resonant network comprises a microwave open circuit line, which presents an open circuit characteristic for DC and a resonant characteristic for microwave signals, and the DC bias circuit is arranged between the second port of the modulating element and the microwave open circuit line.

[0076] In this case, the second port of the modulating element is directly connected to the DC bias circuit. This arrangement has the advantage of reducing the circuit components and lowering the cost of the circuit, but has the disadvantage that the wireless communication circuit can only work at a single frequency point.

[0077] In comparison, the wireless communication circuit with the first resonant network can work within a certain bandwidth, but has slightly more circuit components and is slightly more complex to debug.

[0078] Figure 5 shows a wireless communication circuit according to an embodiment of the present application, which is based on any of the above embodiments, and further comprises a matching circuit connected to the first port.

[0079] The matching circuit is mainly used to achieve impedance matching between the first port of the modulating element and a microwave input / output port (not shown in the figure), and is used to feed the first frequency f in microwave signals into the first port of the modulating element with maximum efficiency, and to transmit the frequency f out = 914MHz variable frequency signals output from the first port of the modulating element to the microwave input / output port with maximum efficiency.

[0080] In this embodiment, the same component parameters as in the above embodiments are used, i.e., the DC bias circuit provides a DC bias of 0.3V and a current of about 5 microamperes, the DC bias circuit is arranged between the second port and the first resonant network, the microwave signal frequency transmitted by the remote transceiver is 950MHz (i.e., the first frequency f in ), the frequency of the backhaul microwave signal is 914MHz (i.e., the second frequency f out ), and the second resonant frequency (f res ) of the second resonant network is 36MHz. The drive power threshold of the modulating element is -67dBm.

[0081] It can be seen that the matching circuit helps to reduce the microwave energy loss caused by impedance adaptation, improves the coupling efficiency of microwave energy, and thus reduces the microwave drive power threshold of the wireless communication circuit.

[0082] In an embodiment, a wireless communication circuit is also provided, as shown in Figure 6, which is based on any of the above embodiments and further comprises a sensing element.

[0083] In the embodiment, the wireless communication circuit is the wireless communication circuit in the embodiment corresponding to FIG. 3, and the sensing element is used to convert the change of the to-be-detected sensing quantity into a change of capacitance or inductance.

[0084] In an embodiment, the sensing element is arranged at multiple positions, for example, at least one of the following positions: between the third port and the second resonant network, between the second port and the first resonant network, and between the first port and the microwave input / output port.

[0085] In the embodiment, the sensing element is arranged between the third port of the modulation element and the second resonant network, that is, one end of the sensing element is electrically connected to the second resonant network and the third port of the modulation element, respectively.

[0086] In an embodiment, the sensing element can also be arranged between the second port of the modulation element and the first resonant network, that is, one end of the sensing element is electrically connected to the first resonant network and the second port of the modulation element, respectively, or one end of the sensing element is electrically connected to the second port of the modulation element, and the other end is electrically connected to the first resonant network.

[0087] In an embodiment, the sensing element can also be arranged between the first port of the modulation element and the microwave input / output port, that is, one end of the sensing element is electrically connected to the microwave input / output port and the first port of the modulation element, respectively, or one end of the sensing element is electrically connected to the first port of the modulation element, and the other end is electrically connected to the microwave input / output port.

[0088] In an embodiment, the type of the sensing element is not limited, which can be a sensing element for sensing a slowly-varying signal, a sensing element for sensing a transient signal, or a sensing element for sensing both a slowly-varying signal and a transient signal.

[0089] In operation, the sensing element senses the change of the to-be-detected sensing quantity, converts the change of the to-be-detected sensing quantity into a change of capacitance or inductance, and the change of capacitance or inductance further causes the second resonant network to output a second resonant frequency that changes with the change of capacitance or inductance, thereby completing passive sensing of the to-be-detected sensing quantity. The to-be-detected sensing quantity includes but is not limited to one or more of the following physical quantities: temperature, pressure, vibration, humidity, voiceprint, displacement, and dielectric constant.

[0090] FIG. 7 shows a wireless communication circuit according to an embodiment of the present application. Based on any suitable embodiment described above, in the embodiment, the modulation element includes a high electron mobility transistor (HEMT), the sensing element includes a capacitive sensing element, and the drain, source, and gate of the HEMT are used as the first port, the second port, and the third port, respectively.

[0091] In the embodiment, a matching circuit and a sensing element are further included.

[0092] The matching circuit is arranged between the first port of the modulation element and the microwave input / output port, and is mainly used for realizing impedance matching between the wireless communication circuit and the microwave input / output port (not shown in the figure), and for feeding the first frequency f in The first microwave signal is introduced into the first port of the modulation element with maximum efficiency, and the second frequency f out The frequency conversion signal is transmitted to the microwave input / output port with maximum efficiency.

[0093] The sensing element is arranged between the matching circuit and the first port of the modulation element, that is, one end of the sensing element is electrically connected with the matching circuit and the first port of the modulation element respectively, or one end of the sensing element is electrically connected with the first port of the modulation element, and the other end is electrically connected with the matching circuit.

[0094] Figure 8 shows a wireless communication system according to an embodiment of the present application, which comprises the wireless communication circuit, the first antenna, the second antenna and the transceiver according to any one of the preceding embodiments;

[0095] The transceiver is electrically connected with the first antenna, and the wireless communication circuit is electrically connected with the second antenna;

[0096] The transceiver is used for sending signals to the first antenna, receiving the returned second frequency conversion signal, and demodulating the corresponding information according to the frequency conversion signal;

[0097] The first antenna is used for sending the first microwave signal to the second antenna, and receiving the frequency conversion signal returned by the second antenna;

[0098] The second antenna is used for receiving the first microwave signal, sending the first microwave signal to the wireless communication circuit, and sending the frequency conversion signal after mixing of the wireless communication circuit to the first antenna.

[0099] In operation, the transceiver sends signals to the first antenna, and the first antenna sends the first microwave signal with the first frequency to the second antenna;

[0100] The second antenna receives the first microwave signal, and sends the first microwave signal to the wireless communication circuit;

[0101] The modulation element of the wireless communication circuit mixes the fed first microwave signal with the oscillation signal of the second resonance frequency fed by the second resonance network, and sends the frequency conversion signal after mixing to the second antenna;

[0102] The second antenna sends the frequency conversion signal;

[0103] The first antenna receives the returned frequency conversion signal, and sends the frequency conversion signal to the transceiver;

[0104] The transceiver demodulates corresponding information from the frequency conversion signal.

[0105] In one embodiment, a wireless communication system is provided, and on the basis of the corresponding embodiment in Fig. 8, the wireless communication circuit further comprises a sensing element, the second resonant frequency of the oscillation signal fed into the second resonant network is affected by the sensing element, and the second resonant frequency changes with the change of the sensing quantity; at this time, the frequency conversion signal carries sensing information, and the transceiver can demodulate corresponding sensing quantity information from the frequency conversion signal.

[0106] In one embodiment, a wireless communication method is provided, comprising the following steps:

[0107] The transceiver sends a first microwave signal with a frequency of a first frequency to the second antenna through the first antenna;

[0108] The second antenna receives the first microwave signal and sends the first microwave signal to the wireless communication circuit;

[0109] The modulation element of the wireless communication circuit mixes the fed-in first microwave signal with the oscillation signal with a second resonant frequency fed into the second resonant network to obtain a frequency conversion signal with a second frequency, and sends the frequency conversion signal to the second antenna;

[0110] The second antenna sends the frequency conversion signal;

[0111] The first antenna receives the returned frequency conversion signal and sends it to the transceiver;

[0112] The transceiver demodulates corresponding information from the frequency conversion signal.

[0113] Although the present application has been described herein with reference to the explanatory embodiments, it is understood that various modifications and implementations can be devised by those skilled in the art which will fall within the principles and spirit of the present application. More specifically, many variations and modifications of the subject combination arrangement can be made to the constituent elements and / or arrangements of the subject combination arrangement within the scope of the present application. Other uses will also become apparent to those skilled in the art, apart from those shown and described herein, upon citation of this disclosure.

Claims

1. A wireless communication circuit, characterized by, The modulation element, the first resonant network, the second resonant network and the DC bias circuit are included. The modulation element includes a first port, a second port and a third port, which are used to mix the first microwave signal fed in through the microwave input / output port with the oscillation signal of the second resonant frequency fed in through the second resonant network to generate a frequency conversion signal. The first port is electrically connected with the microwave input / output port. The second port is electrically connected with the first resonant network. The third port is electrically connected with the second resonant network. The DC bias circuit is arranged between the second port and the first resonant network, or arranged between the third port and the second resonant network, or arranged between the first port and the microwave input / output port.

2. A wireless communication circuit as claimed in claim 1, characterized in that The first resonant network includes a port one and at least one second microwave signal port different from the port one, and the second resonant network includes a first port and a second port. The port one of the first resonant network is electrically connected with the second port of the modulation element, the first port of the second resonant network is electrically connected with the third port of the modulation element, and the second port of the second resonant network is electrically connected with the second microwave signal port of the first resonant network.

3. A wireless communication circuit as claimed in claim 1 or 2, characterized in that The DC bias circuit is a DC power supply circuit, a circuit for converting radio frequency energy into direct current, or a circuit for converting environmental energy into direct current.

4. A wireless communication circuit according to any one of claims 1-3, characterized in that, The first resonant network is any one of a microwave open circuit line, an LC resonant network and an RC resonant network; and / or the second resonant network is any one of an LC resonant network and an RC resonant network.

5. A wireless communication circuit according to any one of claims 1-3, characterized by The modulation element is a transistor with a heterojunction.

6. A wireless communication circuit according to any one of claims 1-3, wherein Further included is a matching circuit, which is connected with the first port. The matching circuit is used to realize impedance matching between the wireless communication circuit and the microwave input / output port.

7. A wireless communication circuit according to any one of claims 1-3, wherein The modulation element is a metal oxide semiconductor field effect transistor or a high electron mobility transistor. The first port, the second port and the third port of the modulation element are any one of a drain, a source and a gate.

8. A wireless communication circuit according to any one of claims 1-3, wherein, Further included is a sensing element. The sensing element is used to convert a change in a to-be-detected sensing quantity into a change in a capacitance or inductance. The sensing element is arranged at at least one of the following positions: between the third port and the second resonant network, between the second port and the first resonant network, and between the first port and the microwave input / output port.

9. A wireless communication circuit as claimed in claim 8, characterized in that The sensing element is one of a sensing element for sensing a slowly-varying signal, a sensing element for sensing a transient signal, and a sensing element for sensing both a slowly-varying signal and a transient signal.

10. A wireless communication system, characterized by The wireless communication circuit, the first antenna, the second antenna and the transceiver are included. The transceiver is electrically connected with the first antenna, and the wireless communication circuit is electrically connected with the second antenna. The transceiver is used to send a signal to the first antenna, receive a returned frequency conversion signal, and demodulate corresponding information according to the frequency conversion signal. The first antenna is used to send the first microwave signal to the second antenna, and receive a returned frequency conversion signal from the second antenna. The second antenna is used for receiving the first microwave signal and sending the signal to the wireless communication circuit and sending the frequency conversion signal to the first antenna.

11. A method of wireless communication, the method comprising: The method comprises the following steps: The transceiver sends a first microwave signal with a first frequency to the second antenna through the first antenna; The second antenna receives the first microwave signal and sends the first microwave signal to the wireless communication circuit; The modulation element of the wireless communication circuit mixes the fed-in first microwave signal with the oscillation signal with a second resonant frequency fed in by the second resonant network to obtain a frequency conversion signal with a second frequency, and sends the frequency conversion signal to the second antenna; The second antenna sends the frequency conversion signal; The first antenna receives the returned frequency conversion signal and sends it to the transceiver; The transceiver demodulates the corresponding information according to the frequency conversion signal.

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