Communication circuit, method, apparatus, and system

Abstract

The present invention relates to the technical field of wireless communications, and provides a communication circuit, method, apparatus, and system. The communication circuit comprises a modulation element, an energy convergence network, and a second resonant network. The modulation element disperses energy of a first microwave signal at a first frequency at a first port and transmits same to an energy network via a second port. The energy convergence network converges the dispersed energy to obtain a second microwave signal. The second resonant network performs secondary frequency selection on the second microwave signal and generates an oscillation signal at a second resonant frequency, and transmits the oscillation signal to the modulation element via a third port to mix with the first microwave signal, thereby obtaining a frequency-converted signal at a second frequency. The present invention provides multiple signal transmission paths from the energy convergence network to the second resonant network that bypass the modulation element, thereby reducing the loss of the second microwave signal and acquiring a frequency-converted signal with increased power, and correspondingly lowering the transmit power requirements of a transceiver apparatus and the microwave drive power threshold of the communication circuit.

Description

Communication circuit, method, device and system TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and in particular to a communication circuit, method, device and system. BACKGROUND

[0002] The existing Internet of Things technology can be divided into active Internet of Things technology and passive Internet of Things technology according to whether the terminal needs external power supply. On the one hand, the active Internet of Things technology needs to provide direct current power for the terminal by battery or wired mode, and there are operations such as battery replacement or wiring erection, which greatly increases the cost of terminal deployment and later maintenance. On the other hand, the common passive Internet of Things technology such as RFID often has the same frequency of uplink and downlink carrier signals, which easily leads to the same frequency blockage, limited wireless communication distance and other practical difficulties, and the above difficulties are difficult to overcome.

[0003] In view of the above problems, passive wireless frequency conversion technology emerges as the times require, but still has some deficiencies. For example, the key device in the passive frequency conversion circuit is often driven by collecting microwave signal energy in the free space, and one of the typical problems is that the microwave driving power threshold required by passive frequency conversion is too high, which means that the microwave transmission power of the transceiver device end also needs to be increased or the distance between the transceiver device and the terminal needs to be reduced. The increase of microwave transmission power will bring pressure to the signal reception and processing of the receiving end of the transceiver device, and will lead to the increase of system operation cost and the decrease of service life, and further worsen the influence of the same frequency interference, so it is not expected to expand the wireless communication distance by increasing the microwave transmission power; and the distance between the transceiver device and the terminal directly affects the use convenience of the system. In addition, the existing passive wireless frequency conversion technology also faces the problem of limited frequency change range of frequency conversion. When the frequency change caused by the change of control quantity or sensing quantity is too small, not only the information demodulation accuracy cannot be guaranteed, but also information demodulation error is prone to occur. SUMMARY

[0004] To solve at least one of the technical problems in the prior art, the present application provides a communication circuit, method, device and system.

[0005] In a first aspect of the present application, a communication circuit is provided, comprising: a modulation element, an energy convergence network and a second resonant network;

[0006] The modulation element comprises a first port, a second port and a third port; wherein the first port of the modulation element is configured to receive a first microwave signal with a first frequency, and output a frequency conversion signal with a second frequency;

[0007] The energy converging network electrically connected to the second port of the modulation element is configured to converge the microwave signal output by the second port of the modulation element to obtain a second microwave signal;

[0008] The second resonant network electrically connected to the energy converging network and the third port of the modulation element is configured to generate an oscillation signal with a second resonant frequency according to the second microwave signal, and transmit the oscillation signal to the modulation element.

[0009] The second microwave signal reaches the second resonant network from the energy converging network through at least one transmission path that does not pass through the modulation element, and most or all of the second microwave signal reaches the second resonant network along the at least one transmission path that does not pass through the modulation element.

[0010] Optionally, the at least one transmission path that does not pass through the modulation element partially overlaps or does not overlap with the transmission path of the second microwave signal from the energy converging network to the second resonant network through the modulation element.

[0011] Alternatively, the at least one transmission path that does not pass through the modulation element partially overlaps or does not overlap with each other.

[0012] Optionally, the energy converging network comprises a first resonant network electrically connected to the second port of the modulation element and the second resonant network.

[0013] Alternatively, the energy converging network comprises a first resonant network and at least one passive reciprocal device, and the first resonant network is electrically connected to the second port of the modulation element and the second resonant network through the at least one passive reciprocal device.

[0014] Alternatively, the energy converging network comprises a first resonant network and at least one passive non-reciprocal device, and the first resonant network is electrically connected to the second port of the modulation element and the second resonant network through the at least one passive non-reciprocal device.

[0015] Optionally, the passive non-reciprocal device comprises a circulator, or the passive reciprocal device comprises one or a combination of a directional coupler and a power divider.

[0016] Optionally, the communication circuit further comprises:

[0017] a matching network;

[0018] The matching network comprises a second matching network arranged between the modulation element and the energy converging network, and / or a third matching network arranged between the modulation element and the second resonant network, and / or a fourth matching network arranged between the energy converging network and the second resonant network.

[0019] Optionally, the modulation element is configured as a transistor with a heterojunction.

[0020] Optionally, the second resonant network is configured as a passive piezoelectric resonant network and / or a resonant network with a sensing function.

[0021] The second aspect of the present application provides a communication method, comprising:

[0022] S1: setting the first resonant network to be electrically connected to the second resonant network through the modulation element;

[0023] S2: setting at least one signal transmission path from the first resonant network to the second resonant network without passing through the modulation element;

[0024] S3: the modulation element receives a first microwave signal of a first frequency;

[0025] S4: the modulation element outputs a frequency conversion signal with a second frequency.

[0026] Optionally, the modulation element receives a first microwave signal of a first frequency, specifically comprising:

[0027] The modulation element receives a first microwave signal of a first frequency and outputs a microwave signal after energy dispersion of the first microwave signal;

[0028] The first resonant network re-converges the microwave signal after energy dispersion to obtain a second microwave signal, and the second microwave signal is fed into the second resonant network from the at least one signal transmission path without passing through the modulation element.

[0029] Optionally, the modulation element outputs a frequency conversion signal with a second frequency, specifically comprising:

[0030] The second resonant network generates an oscillation signal of a second resonant frequency according to the second microwave signal;

[0031] The modulation element outputs a frequency conversion signal with a second frequency obtained by mixing the oscillation signal and the first microwave signal.

[0032] Optionally, the second microwave signal is fed into the second resonant network from the at least one signal transmission path without passing through the modulation element, specifically comprising: the second microwave signal is fed into the second resonant network along a path partially or not overlapping with the microwave signal after energy dispersion to the first resonant network.

[0033] Optionally, there are at least two signal transmission paths from the energy convergence network to the second resonant network.

[0034] The third aspect of the present application provides a communication circuit, comprising:

[0035] The communication circuit as claimed in any one of the preceding claims;

[0036] a first reactive device disposed between the modulating element and the second resonant network;

[0037] and / or a second reactive device disposed between the energy converging network and the second resonant network.

[0038] Optionally, the first reactive device or the second reactive device is selected from one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit.

[0039] Alternatively, the first reactive device and the second reactive device are selected from one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit, and are configured to have the same reactive characteristic and reactive value.

[0040] In a fourth aspect, the present application provides a communication method, comprising:

[0041] S1: disposing a first resonant network to be electrically connected with a second resonant network through a modulating element;

[0042] S2: disposing at least one signal transmission path from the first resonant network to the second resonant network without passing through the modulating element;

[0043] S3: disposing a reactive device between the second resonant network and the modulating element, and / or between the second resonant network and an energy converging network;

[0044] S4: the modulating element receiving a first microwave signal of a first frequency;

[0045] S5: the modulating element outputting a frequency-converted signal having a second frequency.

[0046] Optionally, the modulating element receiving the first microwave signal of the first frequency specifically comprises:

[0047] the modulating element receiving the first microwave signal of the first frequency and outputting a microwave signal after energy dispersion of the first microwave signal;

[0048] the first resonant network re-converging the microwave signal after energy dispersion to obtain a second microwave signal, and the second microwave signal being fed into the second resonant network from the at least one signal transmission path without passing through the modulating element.

[0049] Optionally, the modulating element outputting the frequency-converted signal having the second frequency specifically comprises:

[0050] the second resonant network generating an oscillation signal of a second resonant frequency according to the second microwave signal;

[0051] The modulating element outputs an oscillation signal, and the oscillation signal is mixed with the first microwave signal to obtain a frequency conversion signal with a second frequency.

[0052] In a fifth aspect, the present application provides a communication device, comprising:

[0053] The communication circuit according to any one of the preceding aspects;

[0054] A first antenna;

[0055] The first antenna is electrically connected to a first port of a modulating element in the communication circuit, and is configured to receive a first microwave signal with a first frequency transmitted by a transceiving device, and transmit a frequency conversion signal with a second frequency to the transceiving device.

[0056] Optionally, the communication device further comprises:

[0057] A fifth matching network;

[0058] The fifth matching network is arranged between the first antenna and the first port of the modulating element in the communication circuit.

[0059] In a sixth aspect, the present application provides a communication system, comprising:

[0060] The communication device according to any one of the preceding aspects;

[0061] A transceiving device comprising a transceiving circuit and a second antenna electrically connected;

[0062] The transceiving circuit is configured to generate a first microwave signal with a first frequency, and demodulate a received frequency conversion signal with a second frequency to obtain information carried by the frequency conversion signal;

[0063] The second antenna is configured to transmit the first microwave signal with the first frequency generated by the transceiving circuit to the communication device, and receive the frequency conversion signal with the second frequency returned by the communication device.

[0064] In a seventh aspect, the present application provides a communication method for the communication system as described above, comprising:

[0065] S1: The transceiving device in the communication system generates a first microwave signal with a first frequency, and transmits the first microwave signal;

[0066] S2: The communication device in the communication system receives the first microwave signal, and returns a frequency conversion signal with a second frequency;

[0067] S3: The transceiving device in the communication system receives the frequency conversion signal, and demodulates to obtain information carried by the frequency conversion signal.

[0068] The application provides a communication circuit, method, device and system, which have at least the following beneficial effects:

[0069] (1) Since the signal transmission paths from the first resonant network to the second resonant network do not pass through the modulation element, the loss of the second microwave signal can be reduced, so that the power of the frequency conversion signal is improved, the transmission power requirement of the transceiver device is reduced, and the microwave drive power threshold of the communication circuit is reduced.

[0070] (2) Since the reactance device is arranged on the left side and the right side or one side of the second resonant network, the frequency change range of the frequency conversion signal can be expanded, so that the information demodulation accuracy of the transceiver device end is improved. BRIEF DESCRIPTION OF DRAWINGS

[0071] Fig. 1 is a structural schematic diagram of a passive frequency conversion circuit in the prior art;

[0072] Fig. 2 is a structural schematic diagram of one of the communication circuits provided by the embodiment of the application;

[0073] Fig. 3 is a structural schematic diagram of another of the communication circuits provided by the embodiment of the application;

[0074] Fig. 4 is a structural schematic diagram of a third of the communication circuits provided by the embodiment of the application;

[0075] Fig. 5 is a structural schematic diagram of a fourth of the communication circuits provided by the embodiment of the application;

[0076] Fig. 6 is a structural schematic diagram of a fifth of the communication circuits provided by the embodiment of the application;

[0077] Fig. 7 is a structural schematic diagram of the modulation element provided by the embodiment of the application;

[0078] Fig. 8 is a structural schematic diagram of a sixth of the communication circuits provided by the embodiment of the application;

[0079] Fig. 9 is a structural schematic diagram of a seventh of the communication circuits provided by the embodiment of the application;

[0080] Fig. 10 is a structural schematic diagram of an eighth of the communication circuits provided by the embodiment of the application;

[0081] Fig. 11 is a structural schematic diagram of a communication system provided by the embodiment of the application.

[0082] Reference signs: 10-communication circuit; 11-modulation element; 12-first resonant network; 13-second resonant network; 14-energy convergence network; 15-circulator; 16-directional coupler; 17-first matching network; 18-first reactance device; 19-second reactance device; 20-transceiver circuit; 30-first antenna; 40-second antenna; 100-communication device; 200-transceiver device. DETAILED DESCRIPTION

[0083] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0084] FIG. 1 shows a passive frequency conversion circuit in the prior art, which includes a modulation element 11, a first resonant network 12, and a second resonant network 13. The modulation element includes three ports, i.e., a first port T11, a second port T21, and a third port T31. The first port T11 is used to input a first microwave signal with a first frequency (f in ) and output a frequency conversion signal with a second frequency (f out ).

[0085] In the circuit, the modulation element 11 is used to establish a channel for passive transmission between the first port T11 and the second port T21 and between the second port T21 and the third port T31, and mix the fed-in first microwave signal with the first frequency (f in ) and the oscillation signal with the second resonant frequency (f r2 ) fed in by the second resonant network to obtain a frequency conversion signal with the second frequency (f out ), and then output the frequency conversion signal from the first port T11. The modulation element 11 disperses the energy of the fed-in first microwave signal with the first frequency (f in ). The first resonant network 12 is used to re-converge the microwave signal after energy dispersion to obtain a second microwave signal, and feed the second microwave signal into the second resonant network 13 after the modulation element. The second resonant network 13 generates a stable oscillation signal with the second resonant frequency (f r2 ) according to the fed-in second microwave signal, and feeds the oscillation signal with the second resonant frequency (f r2 ) into the modulation element 11 to mix with the first microwave signal with the first frequency (f in ) to obtain a mixed signal with the second frequency (f out ).

[0086] In the above process, the threshold of the microwave driving power required for passive frequency conversion is difficult to be further reduced due to the following reasons. The second microwave signal enters the second port T21 of the modulation element 11 and then is output from the third port T31 of the modulation element 11, which causes power loss. The power of the oscillation signal of the second resonant frequency generated by the second resonant network 13 is weakened, which further causes the power of the frequency conversion signal generated by the first microwave signal and the oscillation signal in the modulation element 11 to be weak or difficult to generate the frequency conversion signal. As a result, the frequency conversion signal is difficult to be received at the transceiver end, and the transmission power of the transceiver end has to be increased or the action distance has to be shortened.

[0087] Therefore, the power loss can be reduced, the power of the frequency conversion signal can be increased, and the threshold of the microwave driving power can be reduced by improving the above circuit structure so that most or all of the second microwave signal does not pass through the modulation element to reach the second resonant network 13.

[0088] FIG. 2 shows a schematic diagram of a communication circuit in an embodiment of the present application, which includes a modulation element 11, an energy converging network 14, and a second resonant network 13. The modulation element 11 disperses the energy of the first microwave signal of the first frequency (f in ) fed in. The energy converging network 14 converges the microwave signal after energy dispersion to obtain a second microwave signal, and feeds the second microwave signal to the second resonant network 13 without passing through the modulation element. The second resonant network 13 generates a stable oscillation signal of the second resonant frequency (f r2 ) according to the second microwave signal fed in, and feeds the oscillation signal of the second resonant frequency (f r2 ) to the modulation element 11 to mix with the first microwave signal of the first frequency (f in ) to obtain a frequency conversion signal of the second frequency (f out ).

[0089] In the embodiment, the second microwave signal from the energy converging network 14 to the second resonant network 13 includes at least two signal transmission paths, which are partially overlapped or not overlapped with each other. Taking two signal transmission paths as an example, the first path is a path from the energy converging network 14 to the second resonant network 13 through the modulation element 11, and the second path is a path from the energy converging network 14 to the second resonant network 13 without passing through the modulation element 11. The first path and the second path are not overlapped or partially overlapped.

[0090] ​​​​By the above arrangement, after the energy gathering network 14 re-gathers the microwave signal dispersed by the modulating element 11 to obtain the second microwave signal, most or all of the second microwave signal will reach the second resonant network 13 through the second path. In this way, the second microwave signal reaches the second resonant network 13 almost without loss, and further generates an oscillation signal and a frequency conversion signal, so as to output a higher-power frequency conversion signal, and accordingly reduce the microwave driving power threshold. It can be understood that "most" means at least more than half, further more than 60%, more than 70%, more than 80%, more than 90%, or more than 95%.

[0091] FIG. 3 shows a schematic diagram of a communication circuit in an embodiment of the present application. Based on the foregoing corresponding embodiment, the energy gathering network 14 includes the first resonant network 12, which is electrically connected to the second port T21 of the modulating element 11 and the second resonant network 13. In this embodiment, the second microwave signal reaching the second resonant network 13 from the energy gathering network 14 includes two signal transmission paths, which do not overlap with each other.

[0092] The first signal transmission path is a path formed by the first resonant network 12, the second port T21 of the modulating element 11, and the third port T31 of the modulating element 11 reaching the second resonant network 13, and the second path is a path formed by the first resonant network 12 reaching the second resonant network 13 without passing through the modulating element 11. The two signal transmission paths do not overlap with each other. In this way, after the energy gathering network 14 re-gathers the microwave signal dispersed by the modulating element 11 to obtain the second microwave signal, most or all of the second microwave signal will reach the second resonant network 13 through the second path. In this way, the second microwave signal reaches the second resonant network 13 almost without loss, and further generates an oscillation signal and a frequency conversion signal, so as to output a higher-power frequency conversion signal, and accordingly reduce the microwave driving power threshold.

[0093] In some embodiments, a matching network is arranged on the first path, which is used to reduce the energy loss of the microwave or radio frequency signal caused by impedance mismatch during transmission, and further improve the transmission efficiency. For example, a second matching network is arranged between the second port T21 of the modulating element 11 and the energy gathering network 14, and / or a third matching network is arranged between the third port T31 of the modulating element 11 and the second resonant network 13. In this way, the microwave signal dispersed by the modulating element 11 can reach the energy gathering network 14 without loss, and / or the oscillation signal generated at the second resonant network 13 can reach the third port T31 of the modulating element 11 without loss, thereby further reducing the microwave driving power threshold.

[0094] In some embodiments, a matching network is arranged on the second path, which is used to reduce the energy loss caused by impedance mismatch during the transmission of the microwave or radio frequency signal, thereby improving the transmission efficiency. For example, a fourth matching network is arranged between the first resonant network 12 and the second resonant network 13. In this way, the second microwave signal generated at the first resonant network 12 can be transmitted to the second resonant network 13 without loss, thereby further reducing the microwave driving power threshold.

[0095] In some embodiments, in addition to the first resonant network 12, the energy convergence network 14 further comprises a plurality of passive reciprocal devices arranged between the second port T21 of the modulation element 11 and the first resonant network 12, which are used to change the transmission path of the second microwave signal so that it reaches the second resonant network 13 along a path that does not pass through the modulation element 11.

[0096] In some embodiments, the passive reciprocal device can be one or a combination of a directional coupler and a power divider.

[0097] In some embodiments, a passive non-reciprocal device can also be used to replace the passive reciprocal device. A typical passive non-reciprocal device is a circulator.

[0098] FIG. 4 shows a schematic diagram of a communication circuit in an embodiment of the present application. Based on the aforementioned corresponding embodiments, the energy convergence network 14 comprises the first resonant network 12 and a circulator 15, which is a three-port device in this embodiment. The first port T12 of the circulator 15 is electrically connected to the second port T22 of the modulation element 11, the second port T22 of the circulator 15 is electrically connected to the first resonant network 12, and the third port T32 of the circulator 14 is electrically connected to the second resonant network 13.

[0099] In this embodiment, the transmission of the second microwave signal from the energy convergence network 14 to the second resonant network 13 includes two signal transmission paths, the first signal transmission path is a path formed by the energy convergence network 14, the circulator 15, and the modulation element 11 to the second resonant network 13, and the second signal transmission path is a path formed by the energy convergence network 14, the circulator 15, and the second resonant network 13. The first path and the second path partially overlap.

[0100] In this embodiment, the modulating element 11 energy dispersed microwave signal from the second port T21 of the modulating element 11 into the first port T11 of the circulator 15, and then from the second port T21 of the circulator 15 into the first resonant network 12, and then converges to obtain the second microwave signal, the second microwave signal in turn from the second port T22 of the circulator 15, the third port T32 of the circulator 15 to the second resonant network 13, the second resonant network 13 to the second microwave signal for the second time frequency generation of stable second resonant frequency (f r2 ) of the oscillation signal, and the second resonant frequency (f r2 ) of the oscillation signal into the modulating element 11 with the first microwave signal having a first frequency (f in ) for mixing, obtaining a frequency conversion signal having a second frequency (f out ), thereby outputting a higher power frequency conversion signal, and accordingly reducing the microwave drive power threshold.

[0101] In some embodiments, two or more passive reciprocal devices can be provided between the second port T21 of the modulating element 11 and the first resonant network 12. In the field of microwave or radio frequency, the characteristics of the device can be evaluated by scattering parameters (i.e. S parameters), and the passive characteristics of the device are represented by the S parameters not greater than 1, and the reciprocal characteristics of the device are represented by the device being exchangeable in direction, that is, the characteristics of the device are consistent from both sides of the channel of the device.

[0102] In some embodiments, the energy converging network 14 comprises two three-port circulators 15 connected in series, wherein the first port T12 of the former circulator 15 is electrically connected with the second port T21 of the modulation element 11, the second port T21 of the latter circulator 15 is electrically connected with the first resonant network 12, the second port T22 of the former circulator 15 is connected with the first port T12 of the latter circulator 15, and the third ports T32 of the two circulators 15 are both connected with the second resonant network 13 without passing through the modulation element 11. In this way, the second microwave signal from the energy converging network 14 to the second resonant network 13 comprises three signal transmission paths, the first signal transmission path is a path from the energy converging network 14 to the second resonant network 13 passing through the two circulators 15 and the modulation element 11, the second signal transmission path is a path from the energy converging network 14 to the second resonant network 13 passing through the two circulators 15, and the third signal transmission path is a path from the energy converging network 14 to the second resonant network 13 passing through the latter circulator 15. There is a partial overlap between the first path and the second path, a partial overlap between the first path and the third path, and a partial overlap between the second path and the third path. In this way, the two three-port circulators 15 connected in series can greatly ensure that the second microwave signal reaches the second resonant network 13 from a path without passing through the modulation element 11, so that a higher-power frequency conversion signal can be output subsequently, thereby correspondingly reducing the microwave driving power threshold.

[0103] Figure 5 shows a schematic diagram of a communication circuit in an embodiment of the present application. On the basis of the corresponding embodiments described above, the energy converging network 14 comprises the first resonant network 12, a directional coupler 16, and a first matching network 17. In this embodiment, the directional coupler 16 is a four-port device. The first port T13 of the directional coupler 16 is electrically connected with the second port T22 of the modulation element 11, the second port T23 of the directional coupler 16 is electrically connected with the first resonant network 12, the third port T33 of the directional coupler 16 is electrically connected with the second resonant network 13, and the fourth port T43 of the directional coupler 16 is electrically connected with the first matching network 17. The first matching network 17 is used to realize non-reflection transmission from the fourth port T43.

[0104] In this embodiment, the second microwave signal from the energy converging network 14 to the second resonant network 13 comprises two signal transmission paths, the first signal transmission path is a path from the energy converging network 14 to the second resonant network 13 passing through the directional coupler 16 and the modulation element 11, and the second signal transmission path is a path from the energy converging network 14 to the second resonant network 13 passing through the directional coupler 16. There is a partial overlap between the first path and the second path.

[0105] The modulated element 11 energy dispersion of the microwave signal from the second port T21 of the modulated element 11 into the first port T13 of the directional coupler 16, most of the microwave signal from the second port T23 of the directional coupler 16 into the first resonant network 12 convergence to obtain the second microwave signal, the second microwave signal in turn from the second port T23 of the directional coupler 16, the second port T33 of the directional coupler 16 to the second resonant network 13, and then produce oscillation signal, frequency conversion signal, so as to output higher power frequency conversion signal, the corresponding reduction of the microwave drive power threshold.

[0106] In some embodiments, the second microwave signal from the energy convergence network 14 to the second resonant network 13 includes three signal transmission paths, which are partially overlapped or not overlapped with each other.

[0107] Figure 6 shows a schematic diagram of a communication circuit in an embodiment of the present application, based on the corresponding embodiment described above, the energy convergence network 14 includes the first resonant network 12, the circulator 15, in this embodiment, the circulator 15 is a three-port device. The first port T12 of the circulator 15 is electrically connected with the second port T22 of the modulated element 11, the second port T22 of the circulator 15 is electrically connected with the first resonant network 12, and the third port T32 of the circulator 14 is electrically connected with the second resonant network 13. In addition, the first resonant network 12 is also electrically connected with the second resonant network 13 without passing through the circulator 15.

[0108] In this embodiment, the second microwave signal from the energy convergence network 14 to the second resonant network 13 includes three signal transmission paths, the first signal transmission path is the path from the energy convergence network 14 through the circulator 15, the modulated element 11 to the second resonant network 13, the second signal transmission path is the path from the energy convergence network 14 through the circulator 15 to the second resonant network 13, and the third path is the path from the energy convergence network 14 to the second resonant network 13 without passing through the modulated element 11, the first path and the second path have partial overlap, the first path and the third path have no overlap, and the second path and the third path have no overlap.

[0109] In this embodiment, the modulated element 11 energy dispersion of the microwave signal from the second port T21 of the modulated element 11 into the first port T11 of the circulator 15, and then from the second port T21 of the circulator 15 into the first resonant network 12 to converge to obtain the second microwave signal, most of the second microwave signal reaches the second resonant network 13 along the third path, a part of the second microwave signal reaches the second resonant network 13 along the second path, and the second resonant network 13 generates a stable oscillation signal of the second resonant frequency (f r2 ) by twice frequency selection of the second microwave signal reaching it, and outputs the second resonant frequency (fr2 ) of the oscillation signal into the modulation element 11 mixes with a first microwave signal having a first frequency (f in ) to obtain a frequency conversion signal having a second frequency (f out ), thereby outputting a higher-power frequency conversion signal, and correspondingly reducing the microwave driving power threshold.

[0110] In some embodiments, the modulation element 11 can be a transistor with a heterojunction, for example, a heterojunction bipolar transistor, a field effect transistor (FET), etc. The FET can be a metal oxide semiconductor field effect transistor (MOSFET), a transistor with a two-dimensional electron gas, or a high electron mobility transistor (HEMT).

[0111] In some embodiments, as shown in FIG. 7, the modulation element 11 is a transistor with a two-dimensional electron gas, and the drain (D) of the transistor serves as the first port T11, the source (S) serves as the second port T21, and the gate (G) serves as the third port T31.

[0112] In some embodiments, a transistor with high electron mobility is used as the modulation element 11, and the drain (D) of the transistor serves as the first port T11, the source (S) serves as the second port T21, and the gate (G) serves as the third port T31.

[0113] In some embodiments, the second resonant network 13 can be a passive piezoelectric resonant network, including but not limited to a passive piezoelectric crystal oscillator and a passive piezoelectric MEMS oscillator.

[0114] In some embodiments, the second resonant network 13 can be a resonant network with sensing function. In this way, the second resonant network 13 can not only form an oscillation signal from the second microwave signal, but also cause a change in the frequency of the frequency conversion signal according to the change in the sensed quantity, so that the value of the sensed quantity can be obtained by detecting the frequency of the output frequency conversion signal, thereby realizing frequency conversion information transmission under passive wireless conditions and solving the problem that existing passive Internet of Things cannot actively radiate frequency conversion signals.

[0115] In one embodiment of the present application, a communication method is provided, and the specific steps are as follows:

[0116] S1: The first resonant network is electrically connected to the second resonant network through the modulation element;

[0117] S2: At least one signal transmission path is set from the first resonant network to the second resonant network without passing through the modulation element;

[0118] S3: The modulation element receives a first microwave signal having a first frequency (f in );

[0119] S4: the modulation element outputs a frequency conversion signal with the second frequency (f out ).

[0120] By the above arrangement, since a plurality of signal transmission paths from the first resonant network 12 to the second resonant network 13 without passing through the modulation element 11 are arranged, the loss of the second microwave signal can be reduced, thereby obtaining a power-boosted frequency conversion signal, and accordingly the transmission power requirement of the transceiver device is reduced, and the microwave drive power threshold of the communication circuit is reduced.

[0121] In some embodiments, the modulation element 11 outputs a microwave signal after energy dispersion according to the first microwave signal; the first resonant network 12 re-converges the microwave signal after energy dispersion to obtain a second microwave signal; the second microwave signal is fed into the second resonant network 13 from at least one signal transmission path without passing through the modulation element 11; the second resonant network 13 generates an oscillation signal with the second resonant frequency (f r2 ) according to the second microwave signal; and the modulation element 11 outputs a frequency conversion signal with the second frequency (f out ) obtained by mixing the oscillation signal and the first microwave signal.

[0122] In some embodiments, the first microwave signal with the first frequency (f in ) is fed into the first port T11 of the modulation element 11, the modulation element 11 performs energy dispersion on the fed-in first microwave signal; the energy convergence network 14 re-converges the microwave signal after energy dispersion to obtain a second microwave signal, and feeds the second microwave signal into the second resonant network 13 without passing through the modulation element; the second resonant network 13 generates a stable oscillation signal with the second resonant frequency (f r2 ) according to the fed-in second microwave signal; the oscillation signal with the second resonant frequency (f r2 ) is fed into the modulation element 11 to mix with the first microwave signal with the first frequency (f in ) to obtain a frequency conversion signal with the second frequency (f out ); and the frequency conversion signal is output from the first port T11 of the modulation element 11.

[0123] In some embodiments, the aforementioned feeding of the second microwave signal into the second resonant network 13 without passing through the modulation element can be implemented in the following manner, i.e., the second microwave signal is fed into the second resonant network 13 along a path partially overlapping or not overlapping with the part of the microwave signal after energy dispersion reaching the first resonant network 12.

[0124] In some embodiments, the aforementioned feeding of the second microwave signal to the second resonant network 13 without passing through the modulation element can be implemented in the following manner: the energy converging network 14 has at least two signal transmission paths to the second resonant network 13, and the second microwave signal is fed to the second resonant network 13 along at least one path without passing through the modulation element 11.

[0125] As mentioned above, the frequency variation range of the passive frequency conversion technology in the prior art is narrow or limited, and when the frequency variation caused by the change of the control quantity or the sensing quantity is too small, it is not only difficult to ensure the information demodulation accuracy, but also prone to information demodulation errors. To solve this problem, the inventors find that by arranging the reactive device on one or more of the paths from the energy converging network 14 to the second resonant network 13, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0126] In some embodiments, the reactive device is a capacitive element or circuit, or an inductive element or circuit, for example, a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, or an inductive circuit.

[0127] Figure 8 shows a communication circuit in one embodiment of the present application. Based on the aforementioned corresponding embodiments, a first reactive device 18 is arranged between the energy converging network 14 and the third port T31 of the modulation element 11, i.e. the first reactive device 18 is arranged on the path from the energy converging network 14 to the second resonant network 13 through the modulation element 11. The first reactive device 18 can be one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, or an inductive circuit. Through the above arrangement, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0128] In some embodiments, as shown in Figure 8, a second reactive device 19 is arranged, and the second reactive device 19 is arranged on the path from the energy converging network 14 to the second resonant network 13 without passing through the modulation element 11. The second reactive device 19 can be one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, or an inductive circuit. Through the above arrangement, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0129] In some embodiments, as shown in FIG. 8, a second reactive device 19 is provided in addition to the first reactive device 18, and the second reactive device 19 is arranged on the path from the energy converging network 14 to the second resonant network 13 without passing through the modulation element 11. The second reactive device 19 can be one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit. Through the above arrangement, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0130] FIG. 9 shows a schematic diagram of a communication circuit in an embodiment of the present application. Based on the corresponding embodiments described above, in this embodiment, the second microwave signal from the energy converging network 14 to the second resonant network 13 includes three signal transmission paths. The first signal transmission path is the path from the energy converging network 14 to the second resonant network 13 through the circulator 15 and the modulation element 11. The second signal transmission path is the path from the energy converging network 14 to the second resonant network 13 through the circulator 15. The third path is the path from the energy converging network 14 to the second resonant network 13 without passing through the modulation element 11. The first path and the second path partially overlap, the first path and the third path do not overlap, and the second path and the third path partially overlap.

[0131] In some embodiments, as shown in FIG. 9, a second reactive device 19 is provided, and the second reactive device 19 is arranged on the overlapping part of the second path and the third path. The second reactive device 19 can be one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit. Through the above arrangement, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0132] In some embodiments, as shown in FIG. 9, a first reactive device 18 is provided, and the first reactive device 18 can be one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit. Through the above arrangement, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0133] In some embodiments, as shown in Fig. 9, the first reactive device 18 and the second reactive device 19 are provided simultaneously, and the first reactive device 18 and the second reactive device 19 can be one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit, and the second reactive device 19 can be a device with the same reactive characteristic and the same reactive value as the first reactive device 18. Compared with providing a single reactive device, the above-mentioned arrangement can further expand the frequency variation range of the frequency conversion signal and improve the stability of the frequency conversion signal, thereby achieving stable improvement of the information demodulation accuracy at the transceiver end.

[0134] In some embodiments, the first reactive device 18 is one or a combination of a capacitive element, a capacitive sensing element, and a capacitive circuit, and the second reactive device 19 is one or a combination of a capacitive element, a capacitive sensing element, and a capacitive circuit with the same capacitance value as the first reactive device 18.

[0135] In some embodiments, the first reactive device 18 is one or a combination of an inductive element, an inductive sensing element, and an inductive circuit, and the second reactive device 19 is one or a combination of an inductive element, an inductive sensing element, and an inductive circuit with the same inductance value as the first reactive device 18.

[0136] Fig. 10 shows a communication circuit in an embodiment of the present application. Based on the corresponding embodiments described above, the modulation element 11 adopts a transistor with high electron mobility, and the drain (D) of the transistor is used as the first port T11, the source (S) is used as the second port T12, and the gate (G) is used as the third port T13. The first resonant network 12 includes a first inductor and a first capacitor in parallel, and the second resonant network 13 is a passive crystal oscillator. The source of the transistor is electrically connected to the first resonant network 12, one end of the second resonant network 13 is electrically connected to the third port T13 of the modulation element 11, and the other end of the second resonant network 13 is electrically connected to the first resonant network 12. In this way, since a path for the transmission of the second microwave signal without passing through the modulation element 11 is established between the second resonant network 13 and the first resonant network 12, the second microwave signal almost without loss reaches the second resonant network 13, thereby generating an oscillation signal and a frequency conversion signal, and a frequency conversion signal with higher power is output, and accordingly the microwave driving power threshold is reduced.

[0137] In some embodiments, based on the corresponding embodiments described above, as shown in Fig. 10, an inductive element 18 is further provided between the second resonant network 13 and the drain of the transistor. By this arrangement, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0138] In some embodiments, on the basis of the corresponding foregoing embodiments, as shown in FIG. 10, an inductive element 19 is further arranged between the second resonant network 13 and the first resonant network 12. By so arranging, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0139] In some embodiments, on the basis of the corresponding foregoing embodiments, as shown in FIG. 10, an inductive element 18 is arranged between the second resonant network 13 and the drain of the transistor, and an inductive element 19 is arranged between the second resonant network 13 and the first resonant network 12. The inductive element 19 has the same inductance value as the inductive element 18. By so arranging, compared with arranging a single reactive device, the frequency variation range of the frequency conversion signal can be further expanded, and the stability of the frequency conversion signal can be improved, thereby stably improving the information demodulation accuracy at the transceiver end.

[0140] In one embodiment of the present application, a communication method is provided, and the specific steps are as follows:

[0141] S1: arranging the first resonant network to be electrically connected with the second resonant network through the modulation element;

[0142] S2: arranging at least one signal transmission path from the first resonant network to the second resonant network without passing through the modulation element;

[0143] S3: arranging a reactive device between the second resonant network and the modulation element, and / or between the second resonant network and the energy convergence network;

[0144] S4: the modulation element receives a first microwave signal of a first frequency (f in );

[0145] S5: the modulation element outputs a frequency conversion signal having a second frequency (f out ).

[0146] Through the above arrangement, on the one hand, since the signal transmission path from the first resonant network 12 to the second resonant network 13 does not pass through the modulation element 11, the loss of the second microwave signal can be reduced, thereby obtaining a frequency conversion signal with improved power, and accordingly the transmission power requirement of the transceiver device is reduced, and the microwave drive power threshold of the communication circuit is reduced. On the other hand, since the reactive device is arranged on the left and right sides or one side of the second resonant network 13, the frequency variation range of the frequency conversion signal can be expanded, thereby improving the information demodulation accuracy at the transceiver end.

[0147] In some embodiments, the first resonant network 12 re-converges the energy-dispersed microwave signal to obtain a second microwave signal; the second microwave signal is fed into the second resonant network 13 from at least one signal transmission path that does not pass through the modulation element 11; the second resonant network 13 generates an oscillation signal of a second resonant frequency (f r2 ) according to the second microwave signal; and the modulation element 11 outputs a frequency conversion signal having a second frequency (f out ) obtained by mixing the oscillation signal with the first microwave signal.

[0148] In an embodiment of the present application, a communication device 100 is also provided, which comprises the communication circuit 10 of any of the preceding embodiments, and a first antenna 30 electrically connected to the first port T11 of the modulation element 11 in the communication circuit 10, the first antenna 30 being configured to receive a first microwave signal of a first frequency (f in ) transmitted by a transceiver device, and transmit a frequency conversion signal having a second frequency (f out ) to the transceiver device.

[0149] In some embodiments, a fifth matching network is arranged between the first antenna 30 and the first port T11 of the modulation element 11, the fifth matching network being configured to achieve impedance matching between the first antenna 30 and the first port T11 of the modulation element 11, improve microwave signal coupling efficiency, and reduce microwave signal transmission loss.

[0150] Fig. 11 shows a communication system in an embodiment of the present application, which comprises a communication device 100 and a transceiver device 200, the transceiver device 200 comprising a transceiver circuit 20 and a second antenna 40, the transceiver circuit 20 being electrically connected to the second antenna 40, the transceiver circuit 20 being configured to generate a first microwave signal of a first frequency (f in ), and demodulate a frequency conversion signal of a second frequency (f out ) received to obtain information carried by the frequency conversion signal. The second antenna 40 is configured to transmit the first microwave signal of the first frequency (f in ) generated by the transceiver circuit 20 to the communication device 100, and receive the frequency conversion signal of the second frequency (f out ) transmitted back by the communication device 100.

[0151] In an embodiment of the present application, a communication method is also provided, which comprises the following steps:

[0152] S1: generating, by a transceiver device, a first microwave signal of a first frequency (f in ), and transmitting the first microwave signal;

[0153] S2: receiving, by a communication device, the first microwave signal, and transmitting back a frequency conversion signal having a second frequency (f out );

[0154] S3: The transceiver receives the frequency-converted signal and demodulates to obtain the information carried thereby.

[0155] In the description of the embodiments of the present application, it needs to be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inner", "outer", "inboard", "outboard", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Among them, "inboard" refers to the interior or enclosed area or space. "Periphery" refers to the area around a particular component or a particular area.

[0156] In the description of the embodiments of the present application, the terms "first", "second", "third", "fourth" are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third", "fourth" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0157] In the description of the embodiments of the present application, it needs to be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "assembling" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between the two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0158] In the description of the embodiments of the present application, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0159] In the description of the embodiments of the present application, it needs to be understood that "-" and "~" represent the range between two numerical values, and the range includes the endpoints. For example: "A-B" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0160] In the description of the embodiments of the present application, the term "and / or", merely describes an associated relationship for associated objects, and indicates that three relationships can exist, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " herein generally indicates that the front and rear associated objects are in an "or" relationship. Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A communication circuit, characterized by, Comprising: a modulation element, an energy converging network and a second resonant network; the modulation element comprises a first port, a second port and a third port; wherein the first port of the modulation element is configured to receive a first microwave signal with a first frequency and output a frequency conversion signal with a second frequency; the energy converging network is configured to converge the microwave signal output by the second port of the modulation element to obtain a second microwave signal; the energy converging network comprises a port one and at least one second microwave signal port different from the port one; the second resonant network is configured to generate an oscillation signal with a second resonant frequency according to the second microwave signal and transmit the oscillation signal to the modulation element; the second resonant network comprises a first port and a second port; wherein the port one of the energy converging 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.

2. The communication circuit according to claim 1, characterized by At least one transmission path not passing through the modulation element is formed from the at least one second microwave signal port to the second port of the second resonant network, and the at least one transmission path not passing through the modulation element partially overlaps or does not overlap with each other.

3. The communication circuit of claim 1, wherein, The energy converging network comprises a first resonant network electrically connected with the second port of the modulation element and the second port of the second resonant network; or, the energy converging network comprises a first resonant network and at least one passive reciprocal device, and the first resonant network is electrically connected with the second port of the modulation element and the second port of the second resonant network through the at least one passive reciprocal device; or, the energy converging network comprises a first resonant network and at least one passive non-reciprocal device, and the first resonant network is electrically connected with the second port of the modulation element and the second port of the second resonant network through the at least one passive non-reciprocal device.

4. The communication circuit of claim 3, wherein The passive non-reciprocal device comprises a circulator; or the passive reciprocal device comprises one or a combination of a directional coupler and a power divider.

5. The communication circuit of claim 1, wherein, Further comprising: a matching network; wherein the matching network comprises a second matching network arranged between the second port of the modulation element and the port one of the energy converging network, and / or a third matching network arranged between the third port of the modulation element and the first port of the second resonant network, and / or a fourth matching network arranged between the second microwave signal port of the energy converging network and the second port of the second resonant network.

6. The communication circuit of claim 1, wherein, The modulation element is configured as a transistor with a heterojunction.

7. The communication circuit according to any one of claims 1 to 6, characterized by The second resonant network is configured as a passive piezoelectric resonant network and / or a resonant network with a sensing function.

8. A communication method based on the communication circuit according to any one of the preceding claims 1-7, characterized in that, Comprising: a modulation element receiving a first microwave signal with a first frequency; the modulation element outputting a frequency conversion signal with a second frequency.

9. The communication method according to claim 8, wherein, The modulation element receiving a first microwave signal with a first frequency, specifically comprising: the modulation element receiving a first microwave signal with a first frequency and outputting a microwave signal after energy dispersion of the first microwave signal; The energy gathering network re-gathers the energy-dispersed microwave signal to obtain a second microwave signal, and the second microwave signal is fed into the second resonant network from a second microwave signal port.

10. The communication method according to claim 9, wherein, The modulation element outputs a frequency conversion signal with the second frequency, specifically including: The second resonant network generates an oscillation signal with a second resonant frequency according to the second microwave signal; The modulation element outputs a frequency conversion signal with the second frequency obtained by mixing the oscillation signal and the first microwave signal.

11. The communication method according to claim 9, wherein The second microwave signal is fed into the second resonant network from a second microwave signal port, specifically including: at least one transmission path without passing through the modulation element is formed from the at least one second microwave signal port to the second end of the second resonant network, and the second microwave signal is fed into the second port of the second resonant network along the at least one transmission path without passing through the modulation element.

12. The communication method according to claim 9, wherein, There are at least two signal transmission paths from the energy gathering network to the second resonant network.

13. A communication circuit, characterized by Including: The communication circuit according to any one of claims 1-7; A first reactive device is arranged between the modulation element and the second resonant network; And / or a second reactive device is arranged between the energy gathering network and the second resonant network.

14. The communication circuit of claim 13, wherein, The first reactive device or the second reactive device is selected from one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit; Or, the first reactive device and the second reactive device are selected from one or a combination of a capacitive element, an inductive element, a capacitive sensing element, an inductive sensing element, a capacitive circuit, and an inductive circuit, and are configured to have the same reactive characteristic and reactive value.

15. A communication method based on the communication circuit according to any one of claims 1-7, 13-14, characterized by, Including: The reactive device arranged between the first port of the second resonant network and the third port of the modulation element, and / or between the second port of the second resonant network and the second microwave signal port of the energy gathering network; The modulation element receives a first microwave signal with a first frequency; The modulation element outputs a frequency conversion signal with a second frequency.

16. The communication method according to claim 15, wherein, The modulation element receives a first microwave signal with a first frequency, specifically including: The modulation element receives a first microwave signal with a first frequency and outputs an energy-dispersed microwave signal of the first microwave signal; The energy gathering network re-gathers the energy-dispersed microwave signal to obtain a second microwave signal, and the second microwave signal is fed into the second resonant network from a second microwave signal port.

17. The communication method of claim 15, wherein, The modulation element outputs a frequency conversion signal with the second frequency, specifically including: The second resonant network generates an oscillation signal with a second resonant frequency according to the second microwave signal; The modulation element outputs a frequency conversion signal with the second frequency obtained by mixing the oscillation signal and the first microwave signal.

18. A communications device, characterized by Including: The communication circuit according to any one of claims 1-7, 13-14; A first antenna; The first antenna is electrically connected to the first port of the modulation element in the communication circuit and is configured to receive a first microwave signal with a first frequency sent by the transceiver device and send a frequency conversion signal with a second frequency to the transceiver device.

19. The communication apparatus according to claim 18, wherein Further including: A fifth matching network; The fifth matching network is arranged between the first antenna and the first port of the modulation element in the communication circuit.

20. A communication system, characterized by Including: The communication device according to any one of claims 18-19; The transceiving device comprises a transceiving circuit and a second antenna connected electrically; The transceiving circuit is configured to generate a first microwave signal with a first frequency and demodulate a received frequency conversion signal with a second frequency to obtain information carried by the frequency conversion signal; The second antenna is configured to transmit the first microwave signal with the first frequency generated by the transceiving circuit to the communication device and receive a frequency conversion signal with the second frequency returned by the communication device.

21. A communication method for use in the communication system of claim 20, characterized by Comprise: S1: The transceiving device in the communication system generates a first microwave signal with a first frequency and transmits the first microwave signal; S2: The communication device in the communication system receives the first microwave signal and returns a frequency conversion signal with a second frequency; S3: The transceiving device in the communication system receives the frequency conversion signal and demodulates to obtain information carried by the frequency conversion signal.

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