Communication circuit based on electric balance duplexer

Abstract

The invention discloses a communication circuit based on an electric balance duplexer. The communication circuit is used for improving the signal resource utilization rate of the communication circuit. The circuit provided by the invention comprises a transmitting and receiving antenna, an electric balance duplexer, an impedance adjusting network and a transmitting antenna, the transmit-receive antenna end of the electric balance duplexer is electrically connected with the transmit-receive antenna. The electric balance end of the electric balance duplexer is electrically connected with the transmitting antenna through the impedance adjusting network, and the impedance adjusting network is used for providing impedance matched with the transmitting and receiving antenna for the electric balance end; the electric balance duplexer comprises a signal sending end, and the electric balance duplexer is used for transmitting a to-be-sent signal provided by the signal sending end to the receiving and sending antenna to execute sending, and transmitting the to-be-sent signal to the sending antenna through the impedance adjusting network to execute sending.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a communication circuit based on an electrically balanced duplexer. Background Art

[0002] In the field of communications, the simultaneous same-frequency full-duplex technology used in wireless communication devices can achieve simultaneous bidirectional data transmission on the same frequency band, which can effectively improve the utilization of the spectrum. However, since the signal transmission and reception use the same frequency band, the device receives its own transmission signal while receiving the remote useful signal. The transmission signal received by itself can also be called a self-interference signal. Since the power level of the self-interference signal is much greater than the power level of the received signal, the signals of other devices will be submerged in the self-interference signal.

[0003] The Electrically Balanced Duplexer (EBD) is a four-port network implemented using a transformer. The network uses the consistent impedance of the antenna end and the electrically balanced end to achieve high isolation between the transmit and receive frequency bands, thereby solving the problem of self-interference signals. Among them, since the electrically balanced end of the EBD is grounded, the transmitted signal is grounded through the electrically balanced end, causing the transmit power to be halved. If the overall transmit power is increased, the transmit signal lost from the grounding of the electrically balanced end will also increase, which is contrary to the goal of green base stations to achieve energy conservation and consumption reduction. In addition, increasing the power requires the power tolerance level of the original components of the entire system to be increased accordingly, which is not conducive to overall energy conservation and efficiency improvement.

[0004] How to improve the signal resource utilization rate of communication circuits is a technical problem to be solved by this application. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a communication circuit based on an electrically balanced duplexer, so as to improve the signal resource utilization rate of the communication circuit.

[0006] The embodiment of the present application provides a communication circuit based on an electrically balanced duplexer, comprising: a transceiver antenna, an electrically balanced duplexer, an impedance adjustment network, and a transmitting antenna;

[0007] The transceiver antenna end of the electrically balanced duplexer is electrically connected to the transceiver antenna;

[0008] The electrically balanced end of the electrically balanced duplexer is electrically connected to the transmitting antenna through the impedance adjustment network, and the impedance adjustment network is used to provide the electrically balanced end with an impedance that matches the transmitting and receiving antenna;

[0009] The electrically balanced duplexer includes a signal transmitting end, and the electrically balanced duplexer is used to transmit the signal to be transmitted provided by the signal transmitting end to the transceiver antenna for transmission, and to transmit the signal to be transmitted to the transmitting antenna through the impedance adjustment network for transmission.

[0010] The circuit provided by the embodiment of the present application includes a transceiver antenna, an electrically balanced duplexer, an impedance adjustment network and a transmitting antenna; the transceiver antenna end of the electrically balanced duplexer is electrically connected to the transceiver antenna; the electrically balanced end of the electrically balanced duplexer is electrically connected to the transmitting antenna through an impedance adjustment network, and the impedance adjustment network is used to provide an impedance matching the transceiver antenna to the electrically balanced end; the electrically balanced duplexer includes a signal transmitting end, and the electrically balanced duplexer is used to transmit the signal to be transmitted provided by the signal transmitting end to the transceiver antenna for transmission, and to transmit the signal to be transmitted to the transmitting antenna through the impedance adjustment network for transmission. Through the circuit provided by the embodiment of the present application, the transmission can be performed jointly by the transceiver antenna and the transmitting antenna, and the signals transmitted by the two antennas form a common mode signal, which effectively improves the transmission power, can double the original transmission power, and improve the transmission power utilization rate, which is conducive to reducing energy consumption and improving link efficiency, and then is conducive to increasing the coverage range and transmission distance of communication equipment. In terms of link efficiency, without changing the original input transmission power level of the communication system, when the current intensity of the system itself remains unchanged, the circuit provided by the embodiment of the present application can effectively increase the transmission power. Since the transmission power is proportional to the link efficiency, the link efficiency can also be effectively improved. In addition, the circuit provided by the present application adds a transmitting antenna, which is equivalent to expanding the transmission antenna, improving the equivalent effective isotropic radiation power of the circuit as a whole, which is conducive to improving the signal coverage range and distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0012] Figure 1 This is one of the structural schematic diagrams of a communication circuit based on an electrically balanced duplexer according to an embodiment of the present application;

[0013] Figure 2 This is a second structural schematic diagram of a communication circuit based on an electrically balanced duplexer according to an embodiment of the present application;

[0014] Figure 3 This is a third structural schematic diagram of a communication circuit based on an electrically balanced duplexer according to an embodiment of the present application;

[0015] Figure 4 This is a fourth structural diagram of a communication circuit based on an electrically balanced duplexer according to an embodiment of the present application;

[0016] Figure 5 It is a schematic diagram of an impedance adjustment network circuit structure that is optional in an embodiment of the present application;

[0017] Figure 6 This is a schematic diagram of a system structure for realizing an impedance adjustment function which is optional in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. The numbering of the drawings in this application is only used to distinguish the various steps in the scheme, and is not used to limit the execution order of the various steps. The specific execution order is subject to the description in the specification.

[0019] Full-duplex electrically balanced network (EBD) is an important technical means to improve the isolation of transmitters and receivers in simultaneous and same-frequency full-duplex communication systems. EBD can greatly offset the self-interference caused by the communication system, has great economic benefits for improving communication quality and making full use of spectrum resources, and is an important component structure of modern communication systems. Although EBD technology can achieve high isolation between transmitters and receivers, it will cause the overall transmission power of the communication system to be halved, and there is a defect of low signal resource utilization. In order to solve the problems existing in the prior art, the present application provides a communication circuit based on an electrically balanced duplexer, which can be used to increase the system transmission power and improve the signal resource utilization. It has important practical significance and can be widely used in communication equipment in the field of communications.

[0020] Those skilled in the art will appreciate that the circuit provided in the embodiments of the present application can be applied to a communication base station or to equipment in other communication fields.

[0021] In order to solve the problems existing in the prior art, the embodiment of the present application provides a communication circuit based on an electrically balanced duplexer, such as Figure 1 As shown, it includes: a transceiver antenna ANT, an electric balanced duplexer EBD, an impedance adjustment network and a transmitting antenna;

[0022] The transceiver antenna terminal P2 of the electrically balanced duplexer EBD is electrically connected to the transceiver antenna ANT;

[0023] The electrically balanced end P4 of the electrically balanced duplexer EBD is electrically connected to the transmitting antenna through the impedance adjustment network, and the impedance adjustment network is used to provide the electrically balanced end P4 with an impedance that matches the transmitting and receiving antenna;

[0024] The electrically balanced duplexer EBD comprises a signal transmitting end P1, and is used to transmit the signal to be transmitted provided by the signal transmitting end P1 to the transceiver antenna ANT for transmission, and transmit the signal to be transmitted to the transmitting antenna through the impedance adjustment network for transmission.

[0025] The circuit provided by the embodiment of the present application can be applied to the field of communications, involving simultaneous and same-frequency full-duplex technology. In practical applications, it is possible to implement simultaneous bidirectional data transmission of devices in the same frequency band. In this solution, at the electrically balanced end of the electrically balanced duplexer, the signal to be transmitted, which was originally grounded, is transmitted through the transmitting antenna through an impedance adjustment network, which can achieve antenna expansion, thereby achieving an increase in the transmission power in the wireless communication system. Among them, the specifications of the transmitting antenna can be selected according to the specifications of the transmitting and receiving antennas.

[0026] The following is an example to illustrate the implementation principle of the electrically balanced duplexer. Figure 1 , EBD can be a four-port network, in which the P1 port is used to provide the antenna with the signal to be transmitted, the P2 port is connected to the transceiver antenna, the P3 port is used to derive the received signal of the antenna, and the P4 port is connected to the impedance adjustment network.

[0027] based on Figure 1 The circuit shown in the figure shows that the working principle of the EBD is that the power propagated through the Tx-ANT-Rx path is offset by the matching power propagated through the Tx-BAL-Rx path, resulting in infinite isolation between the Tx and Rx ports, thereby achieving electrical balance, and then achieving high isolation between the transmitted and received signals of the communication system. Among them, the impedance adjustment network is used to provide matching impedance according to the transmitting and receiving antennas to ensure the electrical balance of the two paths of Tx-BAL-Rx and Tx-ANT-Rx in the EBD.

[0028] The above-mentioned signal to be sent is sent through the circuit provided in the embodiment of the present application, and can be sent jointly through the transceiver antenna ANT and the transmitting antenna. The signals transmitted by these two antennas form a common-mode signal, which effectively improves the transmission power, can double the original transmission power, and improve the transmission power utilization rate, which is beneficial to reducing energy consumption and improving link efficiency, and further beneficial to increasing the coverage range and transmission distance of communication equipment.

[0029] In terms of link efficiency, without changing the original input transmission power level of the communication system, when the current intensity of the system itself remains unchanged, the circuit provided in the embodiment of the present application can effectively improve the transmission power. Since the transmission power is proportional to the link efficiency, the link efficiency can also be effectively improved.

[0030] In addition, the circuit provided in the present application adds a transmitting antenna, which is equivalent to expanding the capacity of the transmitting antenna, thereby improving the effective isotropic radiated power (EIRP) of the entire circuit, thereby greatly improving the signal coverage range and distance.

[0031] Based on the circuit provided in the above embodiment, optionally, Figure 2 As shown, the circuit further includes a circulator;

[0032] The first end of the circulator ( Figure 2 1) is electrically connected to the impedance adjustment network, and the second end ( Figure 2 2 in the figure) is electrically connected to the transmitting antenna (shown as ANT (transmitting) in the figure), and the third end ( Figure 2 3) is electrically connected to the load impedance of the transmitting antenna.

[0033] A circulator is applied in the circuit provided in the embodiment of the present application. The circulator is a three-port non-reciprocal element, and its energy is transmitted unidirectionally along the two ports of the ring, that is, the signal to be transmitted is transmitted from the first port to the second port to the transmitting antenna, and the third port is connected to a matching load, so that the transmission power can be radiated from the transmitting antenna without causing negative impact on the impedance adjustment network.

[0034] In practical applications, the solution provided by the embodiment of the present application can be applied to different practical environments. By adjusting the connection between the impedance adjustment network, the circulator and the transmitting antenna, the transmission power in different application scenarios can be improved, which has strong practical value and realistic significance. Among them, the circulator can select the corresponding specifications according to the actual working frequency band, and the transmitting antenna can be selected according to the specifications of the transmitting and receiving antennas.

[0035] In the circuit provided in the embodiment of the present application, an impedance adjustment network, a circulator and a transmitting antenna are cascaded at the electrically balanced end of the EBD, which not only realizes the impedance adjustment of the balanced end of the electrically balanced duplexer, but also can effectively improve the overall transmission power of the transmitting system. By adding a circulator and a transmitting antenna, the current problem of halving the transmission power due to the use of the EBD architecture is solved.

[0036] In practical applications, the electrically balanced duplexer can operate in different working modes according to actual needs. The working modes include, for example, a signal transmission mode and a signal transceiver duplex mode.

[0037] Based on the circuit provided in the above embodiment, optionally, in a signal sending mode, the impedance adjustment network is used to provide the impedance of the transceiver antenna in the signal sending mode to the electrically balanced end, and the electrically balanced duplexer is used to transmit the signal to be transmitted through the transceiver antenna end to the transceiver antenna for transmission, and to transmit the signal to be transmitted through the electrically balanced end, the impedance adjustment network and the circulator to the transmitting antenna for transmission.

[0038] In signal transmission mode, Figure 2 Taking the circuit structure shown as an example, the transceiver antenna ANT is used to perform signal transmission, and the impedance adjustment network provides impedance matching the signal transmission mode to achieve electrical balance between the two paths of Tx-BAL-Rx and Tx-ANT-Rx. The signal to be transmitted is provided by Tx, and one side is transmitted to the transceiver antenna ANT through the P2 port for transmission, and the other side is transmitted unidirectionally from the first port of the circulator to the second port through the P4 port and the impedance adjustment network, and then reaches the transmitting antenna ANT (transmitting) for transmission.

[0039] Through the circuit provided in the embodiment of the present application, in the working mode of the signal sending mode, the impedance adjustment network can achieve the overall electrical balance of the circuit, and the signal to be sent is sent through the transceiver antenna and the transmitting antenna respectively, which effectively improves the transmission power and improves the signal utilization rate.

[0040] Based on the circuit provided in the above embodiment, optionally, the electrically balanced duplexer includes a signal receiving end, and the electrically balanced duplexer is used to transmit the received signal of the transceiver antenna to the signal receiving end.

[0041] See also Figure 1 or Figure 2 As shown, the electrically balanced duplexer may include a signal receiving end P3, which is used to derive a receiving signal of the antenna and realize a signal receiving function.

[0042] Based on the solution provided in the above embodiment, optionally, in the signal receiving mode, the electrically balanced duplexer is used to transmit the received signal of the transceiver antenna to the signal receiving end. It should be noted that the circuit provided in the embodiment of the present application can be in the signal sending mode and the signal receiving mode at the same time. Since the electrically balanced duplexer can achieve high isolation between the transceiver signals, the two modes will not affect each other.

[0043] Based on the solution provided in the above embodiment, optionally, Figure 3 As shown, the electrically balanced duplexer includes a first balun ①, a second balun ② and a third balun ③. Figure 3 In the figure, the unbalanced end of each balun is shown as a, the first balanced end is shown as b, and the second balanced end is shown as c.

[0044] The unbalanced end of the first balun is electrically connected to the signal transmitting end, the first balanced end of the first balun is electrically connected to the transmitting and receiving antenna end, and the second balanced end of the first balun is electrically connected to the first balanced end of the third balun;

[0045] The unbalanced end of the second balun is electrically connected to the signal transmitting end, the first balanced end of the second balun is electrically connected to the electrical balanced end, and the second balanced end of the second balun is electrically connected to the second balanced end of the third balun;

[0046] The unbalanced end of the third balun is electrically connected to the signal receiving end.

[0047] In the circuit provided in the embodiment of the present application, based on the cross-connected transformer (balun) topology structure, the full-duplex communication equipment can achieve high isolation between transmission and reception, and can improve the utilization rate of spectrum resources.

[0048] Below, based on Figure 3 The circuit structure shown here illustrates the implementation principle of the embodiment of the present application:

[0049] When the system works in the sending mode, the signal to be sent from the P1 port passes through the power divider ( Figure 3 The balun (not shown) is divided into two parts. One part of the signal power flows into the unbalanced end a of balun ①, and is output to the transceiver antenna through the balanced end b of balun ① for transmission; the other part of the signal power enters the unbalanced end a of balun ②. This part of the signal power is of equal amplitude and phase with the signal power entering balun ①, flows through the impedance adjustment network and the circulator in turn through the balanced end b of balun ②, and is then transmitted by the transmitting antenna. This part of the power and the power output to the transceiver antenna through the balanced end a of balun ① can form a common mode signal, thereby increasing the original transmission signal power.

[0050] When the system works in the receiving mode, if the circuit provided by the embodiment of the present application is not used, since the entire system is in a simultaneous and frequency full-duplex transceiver state, the transmitted signal sent by the antenna will be received by the transceiver antenna at the same time, and the received signal and the transmitted signal form self-interference, affecting the quality of the system receiving signal. For the defect of self-interference, in the circuit provided by the embodiment of the present application, when part of the transmitted signal enters P3 through the balanced end c of balun ① via the balanced end b of balun ③, at this time, the impedance network is adjusted to make the impedance of the b end of the second balun consistent with the impedance of the b end of the first balun, so that the signal with the same transmission power can enter the balanced end c of balun ③ through the balanced end c of balun ②, and the two parts of the signal form a differential mode signal at the balanced end input of balun ③. Since the power of the two parts of the signal is equal and opposite, they cancel each other out, so there is no transmitted signal at the unbalanced end a of balun ③. It is ensured that only the received signal enters P3, thereby achieving high isolation between the system transceiver signals, avoiding self-interference, and improving the quality of the received signal.

[0051] It should be noted that the application form of the balun in actual applications is not limited to the form provided in the embodiments of the present application. A duplexer structure formed by cascading microstrip baluns and Marchand baluns can also be selected according to actual needs. Such a structure can be used to build an integrated device. In addition, filters can be added inside and outside the electrically balanced duplexer to optimize the quality of the transmitted and received signals according to actual signal quality requirements.

[0052] Based on the solution provided in the above embodiment, optionally, Figure 4 As shown, the circuit provided in the embodiment of the present application also includes:

[0053] An amplifier electrically connected to the signal transmitting end and / or the signal receiving end is used to amplify the signal.

[0054] Optionally, the amplifier includes a power amplifier PA electrically connected to the signal sending end, and is used to amplify the signal to be sent.

[0055] Optionally, the amplifier includes a low noise amplifier LNA electrically connected to the signal receiving end, for amplifying the received signal and reducing noise.

[0056] The circuit provided in the embodiment of the present application includes: a transceiver antenna (ANT), a power amplifier (PA), a low noise amplifier (LNA), a transformer (balun), an impedance adjustment network (BAL), a three-port (non-reciprocal) circulator, and a transmitting antenna. Through the circuit provided in the embodiment of the present application, the signal to be transmitted and / or the received signal can be amplified to improve the quality of the transmitted signal and the received signal.

[0057] based on Figure 4In the circuit shown, the signal to be transmitted flowing in from the P1 port is first amplified by a power amplifier (PA) and then divided into two by a power divider. One part of the signal passes through the first balun and is transmitted through the transceiver antenna, and the other part of the signal power passes through the second balun and is transmitted through the transmitting antenna.

[0058] In the receiving mode, the signal received by the transceiver antenna includes the transmitted signal. Since the impedance adjustment network can provide the same impedance as the transceiver antenna, electrical balance can be achieved. The signal reaching the unbalanced end of the third balun via the first balun and the signal reaching the unbalanced end of the third balun via the second balun form a differential signal. Since the two parts of the signal power are equal in amplitude and opposite in phase, they cancel each other out. Therefore, no transmitted signal is transmitted to the LNA at the unbalanced end a of the third balun, ensuring that only the received signal enters the LNA, thereby achieving high isolation between the system's transmit and receive signals.

[0059] Among them, the transceiver antenna (ANT) is used to transmit and receive signals at the same frequency at the same time; the power amplifier (PA) is used to amplify the signal to be transmitted, and the low noise amplifier (LNA) is used to amplify the received radio frequency signal and reduce noise; the transformer (balun) is a three-port device, consisting of an unbalanced port and two balanced ports, wherein the two balanced ends are differential structures, which can realize the conversion of the signal from unbalanced to balanced, and the topological structure is formed by cross-connecting the baluns to realize the interconnection between the various components of the system; the impedance adjustment network (BAL) dynamically adjusts its impedance to match the impedance of the transceiver antenna, thereby realizing high isolation of simultaneous and same-frequency transceiver transmission of the communication system; the three-port circulator is used to connect the balanced network and the transmitting antenna to realize unidirectional transmission of the transmission power without affecting the impedance adjustment function of the balanced network; the transmitting antenna is used to transmit the radio frequency signal flowing to the impedance adjustment network, so as to increase the overall transmission power of the system.

[0060] Based on the solution provided in the above embodiment, optionally, the impedance adjustment network is used to switch the working mode of the electrically balanced duplexer, and the working mode includes a signal transmission mode and a signal transceiver duplex mode.

[0061] Figure 5 An optional impedance adjustment network circuit structure schematic diagram is provided, which is composed of adjustable capacitors C1 and C2 cascaded into a π-shaped structure with an adjustable inductor L. The impedance adjustment network can be controlled by a field programmable gate array (FPGA) to achieve impedance adjustment.

[0062] Figure 6This is an optional system structure diagram for realizing the impedance adjustment function. The detector detects the impedance of the transceiver antenna and feeds it back to the FPGA chip. After that, the FPGA controls the impedance adjustment network to dynamically adjust the values ​​of the adjustable capacitor and inductor by issuing instructions, so that the impedance adjustment network is consistent with the transceiver antenna impedance, thereby realizing EBD electrical balance control.

[0063] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0064] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0065] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0066] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0067] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0068] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0069] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0070] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0071] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0072] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A communication circuit based on an electrically balanced duplexer, characterized in that: include: Transceiver antennas, electrically balanced duplexers, impedance adjustment networks, and transmit antennas; The transceiver antenna end of the electrically balanced duplexer is electrically connected to the transceiver antenna; The electrically balanced end of the electrically balanced duplexer is electrically connected to the transmitting antenna through the impedance adjustment network, and the impedance adjustment network is used to provide the electrically balanced end with an impedance that matches the transmitting and receiving antenna; The electrically balanced duplexer includes a signal transmitting end, and the electrically balanced duplexer is used to transmit the signal to be transmitted provided by the signal transmitting end to the transceiver antenna for transmission, and to transmit the signal to be transmitted to the transmitting antenna through the impedance adjustment network for transmission.

2. The circuit according to claim 1, characterized in that Also included is a circulator; The first end of the circulator is electrically connected to the impedance adjustment network, the second end of the circulator is electrically connected to the transmitting antenna, and the third end of the circulator is electrically connected to the load impedance of the transmitting antenna.

3. The circuit according to claim 2, characterized in that In the signal transmission mode, the impedance adjustment network is used to provide the impedance of the transceiver antenna in the signal transmission mode to the electrically balanced end, the electrically balanced duplexer is used to transmit the signal to be transmitted through the transceiver antenna end to the transceiver antenna for transmission, and to transmit the signal to be transmitted through the electrically balanced end, the impedance adjustment network and the circulator to the transmitting antenna for transmission.

4. The circuit according to claim 3, characterized in that The electrically balanced duplexer comprises a signal receiving end, and the electrically balanced duplexer is used to transmit the receiving signal of the transceiver antenna to the signal receiving end.

5. The circuit according to claim 4, characterized in that In the signal receiving mode, the electrically balanced duplexer is used to transmit the receiving signal of the transceiver antenna to the signal receiving end.

6. The circuit according to claim 5, characterized in that The electrically balanced duplexer comprises a first balun, a second balun and a third balun; The unbalanced end of the first balun is electrically connected to the signal transmitting end, the first balanced end of the first balun is electrically connected to the transmitting and receiving antenna end, and the second balanced end of the first balun is electrically connected to the first balanced end of the third balun; The unbalanced end of the second balun is electrically connected to the signal transmitting end, the first balanced end of the second balun is electrically connected to the electrical balanced end, and the second balanced end of the second balun is electrically connected to the second balanced end of the third balun; The unbalanced end of the third balun is electrically connected to the signal receiving end.

7. The circuit according to claim 5 is characterized in that Also includes: An amplifier electrically connected to the signal transmitting end and / or the signal receiving end is used to amplify the signal.

8. The circuit according to claim 7, characterized in that The amplifier comprises a power amplifier electrically connected to the signal transmitting end, and is used for amplifying the signal to be transmitted.

9. The circuit according to claim 7, characterized in that The amplifier includes a low noise amplifier electrically connected to the signal receiving end, and configured to amplify the received signal and reduce noise.

10. The circuit according to any one of claims 1 to 9, characterized in that: The impedance adjustment network is used to switch the working mode of the electrically balanced duplexer, and the working mode includes a signal transmission mode and a signal transceiver duplex mode.

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