WO2016187782A1

WO2016187782A1 - Duplexer and wireless transceiving system

Info

Publication number: WO2016187782A1
Application number: PCT/CN2015/079717
Authority: WO
Inventors: 帅松林; 陈静涛; 谷卫东
Original assignee: 华为技术有限公司
Priority date: 2015-05-25
Filing date: 2015-05-25
Publication date: 2016-12-01
Also published as: CN107431499A

Abstract

Provided are a duplexer and a wireless transceiving system, which are used for solving the problem that the existing duplexer has a complex structure and cannot filter an external interference signal or has a relatively low transceiving isolation. A receiving directional filter in the duplexer is connected to a receiving module, and each bypass filter is connected to a different matched load. A matching network has n+3 ports, wherein a first port of the matching network is connected to a port of an antenna, a second port is connected to the receiving directional filter, and a third port is connected to a transmitting directional filter. Except for the first port, the second port and the third port, each port of the matching network is connected to a different bypass filter. The matching network is used for realizing impedance matching between the port of the antenna, an output port of the transmitting directional filter, an input port of the receiving directional filter and input ports of various bypass filters. Each bypass filter and the matched load connected thereto are used for consuming a signal in a passband of the bypass filter.

Description

Duplexer and wireless transceiver system

Technical field

The present invention relates to the field of communications technologies, and in particular, to a duplexer and a wireless transceiver system.

Background technique

The duplexer is a key component of the wireless transceiver system that transmits and receives at the same time. Its function is to couple the weak receiving signal into the antenna, and to feed the transmitted signal with a large power to the antenna, and both of them need to complete their own. Functions do not affect each other. 1 is a schematic structural view of a duplexer, which is generally composed of two sets of different frequency filters, such as a transmit direction filter 11 and a receive direction filter 12 in FIG. 1, wherein a transmit direction filter 11 and a transmit module 13 is connected, the transmission link includes a transmission direction filter 11 and a transmission module 13, and the reception direction filter 12 is connected to the reception module 14, and the reception link includes a reception direction filter 12 and a reception module 14. The receive direction filter 12 is a band pass filter, and the receive direction filter 12 filters out a signal whose frequency is located in the stop band of the receive direction filter 12, and causes a signal whose frequency is located in the pass band of the receive direction filter 12 to pass. The frequency of the received signal is located in the passband of the receive direction filter 12, and the frequency of the transmit signal is located in the stopband of the receive direction filter 12, so as to prevent the transmit link transmit signal from leaking to the receiving module and affecting the normal operation of the receiving module. Duplexer transceiver isolation is a very important performance indicator of the wireless transceiver system. When the transceiver channel works at the same time, the signal energy of the transmission link will partially leak into the receiving link. If the leakage signal is large, the receiver chain will be received. The path forms interference and deteriorates the performance of the receiving link.

In modern wireless communication systems, the deployment of base stations is becoming more and more dense. The problem of coupled interference between the transmitting and receiving antennas of the station and the co-located transmitting and receiving antennas is more and more serious, and the interference power is usually strong. These interference signals will deteriorate the receiving module. Performance, while improving duplexer transceiver isolation and anti-jamming capabilities can improve the performance of wireless transceiver systems.

At present, a method for improving the transceiver isolation of a duplexer, as described in the patent application CN200710121145.7, is to couple the transmitted signal coupled from the transmitting end to the receiving end after amplitude, phase and delay processing, and The signal received by the receiving end is cancelled by the transmitting end, thereby Attenuation of the signal leaked from the transmitting end is realized, and the influence of the signal leaked at the transmitting end on the receiving module is reduced. However, when this method is used to improve the transceiver isolation of the duplexer, the hardware structure of the duplexer is complicated and difficult to implement, and this method cannot achieve the filtering of the externally introduced interference signal. Another method for improving the transceiver isolation of the duplexer is as described in the patent application CN201180035204.3, which adds a variable impedance between the receiving direction filter 12 and the common end of the antenna, and can be adjusted at different frequencies. Variable impedance to improve the transceiver isolation of the duplexer. However, this method has a relatively small effect on improving the transceiver isolation of the duplexer.

In summary, when the existing method is used to improve the transceiver isolation of the duplexer, there is a problem that the structure of the duplexer is complicated and the externally introduced interference signal cannot be filtered out, or there is a problem that the isolation is limited. .

Summary of the invention

The embodiment of the invention provides a duplexer and a wireless transceiver system for adopting a simple structure to improve the transceiver isolation of the duplexer and filter out externally introduced interference signals.

In a first aspect, a duplexer is provided, including a matching network, a transmit direction filter, a receive direction filter, n bypass filters, and n matched loads, n being a positive integer; the receive direction filter connection receiving Modules, each bypass filter connected to a different matching load;

The matching network has n+3 ports, the first port of the matching network is used to connect the port of the antenna, the second port of the matching network is connected to the receiving direction filter, and the third port of the matching network is connected and transmitted. a directional filter; each port of the matching network except the first port, the second port, and the third port is connected to a different bypass filter;

The matching network is configured to implement impedance matching between an antenna port, an output port of a transmit direction filter, an input port of a receive direction filter, and an input port of each bypass filter;

Each bypass filter is configured to filter a signal in the bypass filter stopband and transmit a signal in the bypass filter passband to a matching load connected to the bypass filter;

Each matched load is used to consume the signal received from the bypass filter.

In conjunction with the first aspect, in a first possible implementation, the matching network includes a first a distribution unit and a circulator having n+2 ports;

The first port of the first matching unit is the first port of the matching network, the second port of the first matching unit is the third port of the matching network, and the first matching unit is Three ports are used to output signals to the circulator having n+2 ports;

One port of the circulator having n+2 ports receives a signal output by the first matching unit, and the other port of the circulator having n+2 ports is a second port of the matching network, The circulator having n+2 ports is respectively connected to a bypass filter except for a port that receives a signal output by the first matching unit and a port that is a port that is a second port of the matching network;

The first matching unit is configured to implement an impedance between a port of the antenna, an output port of the transmit direction filter, and a port of the circulator having n+2 ports that receives the signal output by the first matching unit match.

With reference to the first aspect, in a second possible implementation, the matching network includes a second matching unit and n circulators having three ports;

The first port of the second matching unit is the first port of the matching network, the second port of the second matching unit is the third port of the matching network, and the second matching unit is Three ports are used to output signals to the first circulator;

The first port of the first circulator receives the signal output by the second matching unit, and the third port of the first circulator outputs a signal to the second circulator;

The first port of the nth circulator receives the signal output by the n-1th circulator, and the third port of the nth circulator outputs a signal to the receive directional filter;

The first port of the kth circulator receives the signal output by the k-1th circulator, and the third port of the kth circulator outputs a signal to the k+1th circulator; k is a positive integer, and k =2,...,n-1;

A second port in each circulator outputs a signal to a different bypass filter;

In each circulator, signals are transmitted along the direction of the first port, the second port, and the third port;

The second matching unit is configured to implement an antenna port, an output port of a transmit direction filter An impedance match between a port of the first circulator that receives a signal output by the second matching unit.

With reference to the first aspect, in a third possible implementation manner, the matching network has four ports;

The matching load connected to the bypass filter and the bypass filter constitutes a trap for filtering signals or external interference signals leaking from the transmitting link to the receiving link.

With reference to the first aspect, in a fourth possible implementation, the matching network has five ports;

A matching load connected to the bypass filter by the bypass filter constitutes a trap for filtering the signal leaking from the transmitting link to the receiving link;

The matching load of the other bypass filter connected to the bypass filter constitutes another notch filter for filtering out external interference signals.

In conjunction with the first aspect, in a fifth possible implementation, the matching load of each of the bypass filters and the bypass filter constitutes a notch.

In conjunction with the first aspect, in a sixth possible implementation, the matching load matches a signal within a passband of the bypass filter to which the matched load is connected.

In conjunction with the first aspect, in a seventh possible implementation, at least one of the n bypass filters is a tunable filter.

In a second aspect, a wireless transceiver system is provided, including a receiving module, a transmitting module, an antenna, and a duplexer according to an embodiment of the present invention, where the receiving module, the transmitting module, and the antenna are connected to the duplexer .

Advantageous effects of embodiments of the present invention include:

A duplexer and a wireless transceiver system are provided in the embodiments of the present invention, wherein the matching network can implement an antenna port, an output port of a transmit direction filter, an input port of a receive direction filter, and an input of each bypass filter. The impedance between the ports is matched, so that the matching network can output the signal received from the antenna to the bypass filter through the port connected to the bypass filter, and the bypass filter filters out the signal in the stop band, and Transmitting the signal in its passband to the matching negative connected to it The matched load will consume the signal received from the bypass filter, so that the frequency of the signal that the transmit link leaks to the receive link is located in the bypass filter as long as the parameters of the bypass filter that match the load are adjusted. Within the passband, the matched load connected to the bypass filter can consume the signal that the transmit link leaks to the receive link, or adjust the parameters of a bypass filter that is connected to the matched load so that the frequency of the external interferer is located. In the passband of the bypass filter, the matched load connected to the bypass filter can consume the external interference signal. Similarly, the matching network can output the signal received from the antenna to the port connected to the receive direction filter to the port. Receiving a direction filter, the receiving direction filter can filter out a signal whose frequency is located in the stop band of the receiving direction filter, and pass the received signal whose frequency is located in the pass band of the receiving direction filter, and therefore, the present invention implements The duplexer provided by the example can notch the signal of the transmission link leaking to the receiving link and/or the external interference signal. In order to achieve a simple structure to improve the isolation of the duplexer.

DRAWINGS

1 is a schematic structural view of a duplexer in the prior art;

2 is a schematic structural diagram of a duplexer according to an embodiment of the present invention;

3 is a second schematic structural diagram of a duplexer according to an embodiment of the present invention;

4 is a third schematic structural diagram of a duplexer according to an embodiment of the present invention;

5 is a frequency response curve of the antenna-transmitting module and a frequency response curve of the antenna-receiving module when the duplexer shown in FIG. 4 is used;

6a and 6b are schematic diagrams of signals at node 1, node 2, and node 3 in the receiving link when the duplexer shown in FIG. 4 is employed;

FIG. 7 is a fourth schematic structural diagram of a duplexer according to an embodiment of the present disclosure;

FIG. 8 is a diagram showing signals at node 1, node 2, node 3, and node 4 in the receiving link when the duplexer shown in FIG. 7 is employed.

detailed description

A duplexer and a wireless transceiver system provided by an embodiment of the present invention, wherein a matching network can be Impedance matching between the port of the antenna, the output port of the transmit direction filter, the input port of the receive direction filter, and the input port of each bypass filter; each bypass filter and its associated matching load form a trap The wave device can notch the signal of the transmitting link leaking to the receiving link and the external interference signal by setting the parameters of each bypass filter, thereby realizing a simple structure to improve the isolation of the duplexer.

A specific implementation manner of a duplexer and a wireless transceiver system according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

A duplexer according to an embodiment of the present invention, as shown in FIG. 2, includes a matching network 21, a transmit direction filter 27, a receive direction filter 25, n bypass filters 22, and n matching loads 23, n. a positive integer; the receiving direction filter 25 is connected to the receiving module 26, each bypass filter 22 is connected to a matching load 23, different bypass filters 22 are connected to different matching loads 23;

The matching network 21 has n+3 ports, the first port of the matching network 21 is connected to the port I/O of the antenna 24, and the second port of the matching network 21 is connected to the receiving direction filter 25, the matching network The third port is connected to the transmit direction filter 27; each of the first port, the second port, and the third port in the matching network 21 is connected to a bypass filter 22, and the matching network 21 Different ports in the connection to different bypass filters 22;

The matching network is used for the port I/O of the antenna 24, the output port O of the transmit direction filter 27, the input port I1 of the receive direction filter 25, and the impedance between the input ports I2 of the respective bypass filters 22. match;

The port I/O of the antenna 24 is a port through which the antenna 24 receives a signal from the matching network 21 or transmits a signal to the matching network 21, and the output port O of the transmission direction filter 27 is a connection end of the transmission direction filter 27 and the matching network 21, and receives The input port I1 of the directional filter 25 is a connection end of the receiving direction filter 25 and the matching network 21, and the input port I2 of each bypass filter 22 is a connection end of the bypass filter 22 and the matching network 21;

Each bypass filter 22 is configured to filter out signals in the stop band of the bypass filter 22 and transmit signals in the passband of the bypass filter 22 to the matching with the bypass filter 22. Load 23;

Each matching load 23 is for consuming a signal received from the bypass filter 22; that is, Each bypass filter 22 and its associated matching load 23 are used to notch the signal within the passband of the bypass filter.

The bypass filter in the duplexer provided by the embodiment of the present invention can directly filter the signal of the transmission link leakage to the receiving link and the external interference signal by using the design of the transmission direction filter.

The matching load may only match the transmitted signal, or may only match the received signal, or may only match the signal in the passband of the bypass filter, and may also match the signal in the full frequency band.

Optionally, the matching load matches the signal in the passband of the bypass filter to which the matched load is connected, thereby consuming the signal in the passband of the bypass filter connected to the matched load.

Alternatively, with respect to the consumption of the signal, it is meant that the signal is converted to other energy or signal representations in the branch as long as it is converted to a non-interfering representation, for example, the signal is converted to heat at the matched load.

Also included in FIG. 2 is a transmitting module 28 coupled to the transmit direction filter 27 and a receive module 26 coupled to the receive direction filter 25. The portion of the dashed box in FIG. 2 is a duplexer provided by an embodiment of the present invention.

In the duplexer provided by the embodiment of the invention, the matching network, the bypass filter and the matching load are located in the receiving branch, and the notch function is implemented, and the transmitting signal and/or other external interference signals leaking to the receiving branch can be provided. The additional filtering capability improves the transceiver isolation and external interference suppression capability of the duplexer, and avoids the transmission link leakage signal and external interference signals affecting the receiving link and improving system performance.

Optionally, the matching network in the duplexer provided by the embodiment of the present invention includes a first matching unit and a circulator having n+2 ports;

The first port of the first matching unit is the first port of the matching network, and the second port of the first matching unit is the third port of the matching network, where the first matching unit a third port is for outputting a signal to the circulator having n+2 ports;

One port of the circulator having n+2 ports receives a signal output by the first matching unit, and the other port of the circulator having n+2 ports is a second port of the matching network, The circulator having n+2 ports receives a port of the signal output by the first matching unit And each of the ports other than the port that is the second port of the matching network is respectively connected with a bypass filter;

Wherein, the first matching unit may adopt different devices, for example, the first matching unit is composed of passive components, as long as the port of the antenna, the output port of the transmission direction filter, and the circulator having n+2 ports can be implemented. The impedance matching between the ports receiving the signals output by the first matching unit may be performed.

Optionally, the structure of the matching network in the duplexer provided by the embodiment of the present invention is as shown in FIG. 3, and the matching network 21 includes n circulators 31 and three matching units 32 having three ports;

The first port 1 of the second matching unit 32 is the first port of the matching network, and the second port 2 of the second matching unit is the third port of the matching network, and the second matching unit The third port 3 is for outputting a signal to the first circulator; that is, the first port 1 of the second matching unit 32 is connected to the port I/O of the antenna 24, and the second port 2 of the second matching unit 32 is connected and transmitting. Output port O of the directional filter 27;

The first port 1 of the first circulator 31 receives the signal output by the second matching unit 32, and the third port 3 of the first circulator 31 outputs a signal to the second circulator 31;

The first port 1 of the nth circulator 31 receives the signal output by the n-1th circulator 31, and the third port 3 of the nth circulator 31 outputs a signal to the receiving direction filter 25.

The first port 1 of the kth circulator 31 receives the signal output by the k-1th circulator 31, and the third port 3 of the kth circulator 31 outputs a signal to the k+1th circulator 31; k Is a positive integer, and k=2,...,n-1;

The second port 2 in each circulator 31 outputs a signal to a bypass filter 22;

In each circulator 31, the signal can only be transmitted in one direction; in Figure 3, the signal can only be transmitted in the direction of the first port 1, the second port 2, the third port 3;

The second matching unit 32 is configured to implement the port of the antenna 24 and the output of the transmission direction filter 27 The port and the first circulator 31 receive an impedance match between the ports of the signal output by the second matching unit 32.

Wherein, the second matching unit may adopt different devices. For example, the second matching unit may be constituted by a passive device as long as the port of the antenna, the output port of the transmission direction filter, and the first circulator 31 are received. The impedance matching between the ports of the signals output by the second matching unit is sufficient.

In FIG. 3, the matching network includes three circulators having three ports as an example for description.

Optionally, the duplexer provided by the embodiment of the present invention is illustrated in FIG. 4 (FIG. 4 is an example in which a matching network includes a second matching unit and a three-port circulator, wherein the second matching unit is Not shown in FIG. 4, the second matching unit is connected in the same manner as the second matching unit in FIG. 3), the matching network in the duplexer has four ports, that is, n=1;

The matching load 23 connected to the bypass filter 22 by the bypass filter 22 constitutes a trap. When the frequency at which the transmit link leaks to the receive link (i.e., the transmit leak signal in FIG. 4) is within the passband of the bypass filter 22, the bypass filter 22 and the bypass filter 22 are coupled The matching load 23 constitutes a trap, thereby filtering out signals that the transmitting link leaks to the receiving link. When the frequency of the external disturbance signal is located in the pass band of the bypass filter 22, the bypass filter 22 and the matching load 23 connected to the bypass filter 22 constitute a trap, thereby filtering out the external interference signal.

When the bypass filter 22 of FIG. 4 and the trapper formed by the matching load 23 filter out the signal that the transmission link leaks to the receiving link, the external interference signal can be filtered by the reception direction filter 25. At this time, the frequency response of the antenna-transmitting module and the frequency response of the antenna-receiving module are as shown in FIG. 5, wherein the frequency response of the antenna-transmitting module is also the amplitude-frequency characteristic of the transmitting direction filter, and the frequency of the antenna-receiving module. The response is the relationship between the frequency and the amplitude of the signal output by the direction filter when the signal is transmitted from the antenna through the notch filter composed of the bypass filter and the matched load to the receiving direction filter and output. As can be seen from Figure 5, the notch filter formed by the bypass filter and the matched load filters out the signal that the transmission link leaks to the receiving link.

When the trap filter formed by the bypass filter 22 and the matching load 23 in FIG. 4 filters out the external interference signal, the signal leaked from the transmission link to the receiving link can be filtered by the reception direction filter 25. except. At this time, the signals at Node 1, Node 2, and Node 3 in the receiving link in FIG. 4 are as shown in FIG. 6a or FIG. 6b. The difference between Fig. 6a and Fig. 6b is that in Fig. 6a, the frequency of the external interference signal is closer to the frequency of the signal that the transmission link leaks to the receiving link; in Fig. 6b, the frequency of the external interference signal is closer to the frequency of the received signal. . In Figure 4, the signal at node 1 is the signal that the second matching unit (not shown in Figure 4) outputs to the circulator.

Optionally, the duplexer provided by the embodiment of the present invention is as shown in FIG. 7 (in FIG. 7 , the matching network includes a second matching unit and two three-port circulators as an example, where the second matching unit is used. Not shown in FIG. 7, the second matching unit is connected in the same manner as the second matching unit in FIG. 3), and the matching network (consisting of two circulators 31) in the duplexer has five Port

A bypass filter 22 (the frequency of the signal from which the transmission link leaks to the receiving link is located in the pass band of the bypass filter 22) and the matching load 23 connected to the bypass filter 22 constitute a notch, Filtering the signal that leaks the transmission link to the receiving link;

Another bypass filter 22 (the frequency of the external interference signal is located in the pass band of the bypass filter 22) and the matching load 23 connected to the bypass filter 22 constitute another notch for external interference signals Filter out.

The signals at node 1, node 2, node 3, and node 4 in the receiving link of the duplexer shown in FIG. 7 are as shown in FIG. In Figure 7, the signal at node 1 is the signal that the second matching unit (not shown in Figure 7) outputs to the first circulator.

The bypass filter in the duplexer provided by the embodiment of the invention may be a tunable filter, and the notch frequency adjustment function of the trap is realized by adjusting the passband frequency band of the tunable filter, thereby realizing the transmission The flexible leakage suppression of the link leakage signal to the receiving link and the external interference signal makes it possible to improve the transceiver isolation of the duplexer with a simple structure.

The wireless transceiver system provided by the embodiment of the present invention includes a receiving module, a transmitting module, an antenna, and a duplexer provided by the embodiment of the present invention. The receiving module, the transmitting module, and the antenna are all connected to the duplexer.

Optionally, the embodiment of the present invention further provides a duplexer, including: adding a ring in the duplexer A filter branch is added to bypass the leaked transmit signal to enhance duplexer isolation.

Optionally, the embodiment of the present invention further provides a duplexer, including: adding a circulator plus a filter branch in the duplexer to implement bypassing of external strong interference signals, thereby enhancing anti-interference performance of the duplexer. .

Optionally, the embodiment of the present invention further provides a duplexer, including: adding a circulator and a tunable filter branch in the duplexer to implement a leaked transmission signal in different scenarios (or different frequency points) and The external interference signal is flexibly tracked and filtered by the isolation enhancement duplexer.

The invention improves the performance of the receiver by increasing the bypass isolation and the interference signal filtering capability of the duplexer by adding a bypass branch in the duplexer, thereby reducing channel linearity requirements, improving dynamic range, and increasing base station coverage capability. Further, the duplexer isolation and the interference signal suppression capability are enhanced in a compact manner, which can reduce the difficulty of implementing the duplexer and reduce the overall volume and weight of the duplexer.

The wireless transceiver system provided by the embodiment of the present invention may be a base station or a terminal.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment or a combination of software and hardware aspects. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the computer readable memory is stored in the computer readable memory. The instructions in the production result include an article of manufacture of the instruction device that implements the functions specified in one or more blocks of the flowchart or in a flow or block of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the invention without departing from the spirit and scope of the embodiments of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the embodiments of the invention.

Claims

A duplexer, comprising: a matching network, a transmit direction filter, a receive direction filter, n bypass filters, and n matched loads, n being a positive integer; the receive direction filter being connected to the receive module , each bypass filter is connected to a different matching load;

The matching network has n+3 ports, the first port of the matching network is connected to the port of the antenna, the second port of the matching network is connected to the receiving direction filter, and the third port of the matching network is connected to the transmitting direction filtering. Each of the matching networks except the first port, the second port, and the third port is connected to a different bypass filter;

The matching network is configured to implement impedance matching between an antenna port, an output port of a transmit direction filter, an input port of a receive direction filter, and an input port of each bypass filter;

Each bypass filter is configured to filter a signal in the bypass filter stopband and transmit a signal in the bypass filter passband to a matching load connected to the bypass filter;

Each matched load is used to consume the signal received from the bypass filter.
A duplexer according to claim 1, wherein said matching network comprises a first matching unit and a circulator having n + 2 ports;

The first port of the first matching unit is the first port of the matching network, the second port of the first matching unit is the third port of the matching network, and the first matching unit is Three ports are used to output signals to the circulator having n+2 ports;

One port of the circulator having n+2 ports receives a signal output by the first matching unit, and the other port of the circulator having n+2 ports is a second port of the matching network, The circulator having n+2 ports is respectively connected to a bypass filter except for a port that receives a signal output by the first matching unit and a port that is a port that is a second port of the matching network;

The first matching unit is configured to implement an impedance between a port of the antenna, an output port of the transmit direction filter, and a port of the circulator having n+2 ports that receives the signal output by the first matching unit match.
The duplexer of claim 1 wherein said matching network comprises a second matching unit and n circulators having three ports;

The first port of the second matching unit is the first port of the matching network, the second port of the second matching unit is the third port of the matching network, and the second matching unit is Three ports are used to output signals to the first circulator;

The first port of the first circulator receives the signal output by the second matching unit, and the third port of the first circulator outputs a signal to the second circulator;

The first port of the nth circulator receives the signal output by the n-1th circulator, and the third port of the nth circulator outputs a signal to the receive directional filter;

The first port of the kth circulator receives the signal output by the k-1th circulator, and the third port of the kth circulator outputs a signal to the k+1th circulator; k is a positive integer, and k =2,...,n-1;

A second port in each circulator outputs a signal to a different bypass filter;

In each circulator, signals are transmitted along the direction of the first port, the second port, and the third port;

The second matching unit is configured to implement impedance matching between a port of the antenna, an output port of the transmit direction filter, and a port of the first circulator that receives the signal output by the second matching unit.
The duplexer of claim 1 wherein said matching network has four ports;

The matching load connected to the bypass filter and the bypass filter constitutes a trap for filtering signals or external interference signals leaking from the transmitting link to the receiving link.
The duplexer of claim 1 wherein said matching network has five ports;

A matching load connected to the bypass filter by the bypass filter constitutes a trap for filtering the signal leaking from the transmitting link to the receiving link;

The matching load of the other bypass filter connected to the bypass filter constitutes another notch filter for filtering out external interference signals.
A duplexer according to claim 1, wherein the matching load of each of the bypass filters and the bypass filter constitutes a trap.
The duplexer of claim 1 wherein the matching load matches a signal within a passband of the bypass filter to which the matched load is coupled.
The duplexer of claim 1 wherein at least one of said n bypass filters is a tunable filter.
A wireless transceiver system, comprising: a receiving module, a transmitting module, an antenna, and the duplexer according to any one of claims 1-8;

The receiving module, the transmitting module and the antenna are all connected to the duplexer.