CN210326060U

CN210326060U - Novel duplexer

Info

Publication number: CN210326060U
Application number: CN201921226595.7U
Authority: CN
Inventors: 杨刚; 郭晓锋; 刘谦; 熊瑛; 张腾
Original assignee: Chengdu Xuanshi Weixun Technology Co ltd
Current assignee: Chengdu Xuanshi Weixun Technology Co ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-04-14
Anticipated expiration: 2029-07-31

Abstract

The utility model discloses a novel duplexer, which arranges a receiving path filter and a transmitting path filter in a plane different from a combining port, so that the combining port can perform signal interaction with an antenna at the center of the belly of the whole system, and the size of the connection with the antenna is greatly reduced from the connection with the antenna in the middle of the belly of the whole system; meanwhile, the filter cavity in the filter is correspondingly designed to be bent in space, so that the isolation degree of the duplexer is increased, and the structure of the duplexer is more compact and more miniaturized; therefore, the overall size of the satellite ground station is reduced, and the miniaturization of the satellite ground station is realized.

Description

Novel duplexer

Technical Field

The utility model relates to a duplex communication technology in satellite communication system, mobile communication system and internet of things field especially relates to a novel duplexer.

Background

An OMT (Ortho-Mode Transducer) is also called a dual-Mode Transducer or an orthogonal Mode coupler, and is widely applied to aspects such as satellite communication and military radar, and the like, and the main function of the OMT is to realize orthogonal polarization duplex transmission (separation and synthesis) in antenna feeding. When a signal is fed in from a public port, the signal can be used for separating or combining two orthogonal fundamental mode signals, so that the signals in the same frequency band can work simultaneously in different polarization channels, and the communication capacity is greatly improved; when the OMT duplexer is designed to work in two frequency bands, the OMT duplexer can be used for dual polarization independent transmission of signals and is similar to a duplexer. The OMT-based duplexer is a key part in an ODU (Outdoor Unit for receiving and transmitting signals, also called a transceiver, which is a key part of a satellite communication terminal) system, and the performance of the OMT-based duplexer directly affects the whole system. Therefore, it is important to use OMT duplexers with high polarization level and isolation. However, the common OMT duplexer has low polarization capability, and the OMT duplexer with relatively high polarization capability is often not compact enough, large in size and not convenient enough.

As shown in fig. 1, the chinese utility model patent application with application publication No. CN203103471U discloses a high-bandwidth ku frequency band two-port duplexer with loaded waveguide transition, however, the common port (combining port) of the duplexer, the transmitting port and the receiving port thereof are in a planar structure, at this time, in order not to affect the performance of the duplexer, the receiving and transmitting paths thereof must have certain length requirements, and therefore, the common port can only perform signal interaction with the antenna at the side of the ODU complete machine.

As shown in fig. 2, the application publication No. CN105529518A of the chinese utility model discloses an orthogonal coupler for ka band, its combination port is in the middle (making the ODU complete machine connect with the antenna from the middle of its side), and the transmission port and the receiving port extend toward both sides, but its combination port, transmission port and receiving port are set up in a plane, and inevitably can influence the compactness of the complete machine structure, and is not favorable to the miniaturization of the complete machine. As shown in fig. 3, a duplexer using a side as a signal interaction channel between an ODU complete machine and an antenna system has the defects of long connection and inconvenient connection with an antenna. And the ku frequency band has larger size compared with the ka frequency band, the frequency interval of transmitting and receiving signals is closer, and the design requirement on the duplexer is higher.

SUMMERY OF THE UTILITY MODEL

At least one of the objectives of the present invention is to provide a novel duplexer in which the combiner port, the transmitter port and the receiver port are not on the same plane, so as to miniaturize the duplexer structure by bending the space; and the combining port interacts with the antenna system from the middle of the abdomen of the whole machine, as shown in fig. 4, the connection length of the combining port is only the length in the z-axis direction from the middle of the abdomen of the whole machine to the antenna: a1+ c1, greatly shortens the connection length with the antenna system, facilitates the connection with the antenna system and makes the whole system more portable.

In order to achieve the above object, the present invention adopts a technical solution including the following aspects.

A novel duplexer, comprising:

a transmitting port a, a receiving port b, a combined port c, an OMT, a transmitting path filter a2 and a receiving path filter b 2;

the transmission port a is a transmission signal input port of the transceiver ODU, the reception port b is a reception signal output port of the transceiver ODU, and the combiner port c is a common port where a duplexer and an antenna signal interact with each other;

the circular combining port c is used as a z-axis, and a space coordinate system is established; one end of the combining port c extends in the negative direction of the z axis to perform signal interaction with an antenna signal, and the other end of the combining port c is connected with the OMT along the positive direction of the z axis; the combining port c is respectively connected with the transmitting path filter a2 and the receiving path filter b2 through the OMT; the transmit path filter a2 extends in the xy plane to form a transmit port a, and the receive path filter b2 extends in the xy plane to form a receive port b.

Preferably, in the novel duplexer, the OMT includes: a circular waveguide-rectangular waveguide transition c1, a first rectangular-rectangular waveguide vertical polarization direction transition a1, and a second rectangular-rectangular waveguide horizontal polarization direction transition b 1;

the circular waveguide-rectangular waveguide transition c1 adopts a rectangular waveguide inverted large round corner design, one end of the circular waveguide-rectangular waveguide transition c1 is connected with the combining port c, and the other end of the circular waveguide-rectangular waveguide transition c1 is respectively connected with the first rectangular-rectangular waveguide vertical polarization direction transition a1 and the second rectangular-rectangular waveguide horizontal polarization direction transition b 1;

the first rectangular-rectangular waveguide vertical polarization direction transition a1 is a multistage step-shaped waveguide transition section, and the step bottom of the transition section is connected with the transmitting path filter a 2; the second rectangular-rectangular waveguide horizontal polarization direction transition b1 is located at one side of the multistage stepped waveguide transition section and is connected with the receiving path filter b 2.

Preferably, in the novel duplexer, one end of the transmitting path filter a2 is transitionally connected to the vertical polarization direction of the first rectangular-rectangular waveguide, and is bent and extended in the negative half-axis space of the x-axis to form a transmitting port a located in the negative half-axis of the x-axis;

one end of the receiving path filter b2 is horizontally polarized with the second rectangular-rectangular waveguide in a direction transition b1, and is bent and extended in the positive half axis space of the x axis to form a receiving port b located in the positive half axis of the x axis, so that the transmitting port a and the receiving port b are respectively located at two sides of a combining port c with the central line in the z axis.

Preferably, in a novel duplexer, the transmit path filter a2 includes four size-adjustable and position-adjustable waveguide resonant cavities, namely a first H-plane waveguide resonant cavity, a second E-plane waveguide resonant cavity, a third E-plane waveguide resonant cavity and a fourth E-plane waveguide resonant cavity;

the first H-plane waveguide resonant cavity and the second E-plane waveguide resonant cavity are both in a plate-shaped structure, and the third E-plane waveguide resonant cavity and the fourth E-plane waveguide resonant cavity are both in an L-shaped structure; one end of the first H-plane waveguide resonant cavity is connected with the OMT, and the other end of the first H-plane waveguide resonant cavity is connected with the second E-plane waveguide resonant cavity; one end of the second E-plane waveguide resonant cavity is connected with the first H-plane waveguide resonant cavity, and the other end of the second E-plane waveguide resonant cavity is connected with the third E-plane waveguide resonant cavity in the L-shaped structure; one end of the third E-plane waveguide resonant cavity is connected with the second E-plane waveguide resonant cavity, and the other end of the third E-plane waveguide resonant cavity is connected with the fourth E-plane waveguide resonant cavity; one end of the fourth E-plane waveguide resonant cavity is connected with the third E-plane waveguide resonant cavity, and the other end of the fourth E-plane waveguide resonant cavity is connected with the transmitting port a.

Preferably, in a novel duplexer, the receiving path filter b2 includes six size-adjustable and position-adjustable waveguide resonant cavities, namely a fifth E-plane waveguide resonant cavity, a sixth E-plane waveguide resonant cavity, a seventh E-plane waveguide resonant cavity, an eighth E-plane waveguide resonant cavity, a ninth E-plane waveguide resonant cavity, and a tenth E-plane waveguide resonant cavity;

the fifth E-plane waveguide resonant cavity, the seventh E-plane waveguide resonant cavity and the eighth E-plane waveguide resonant cavity are all in L-shaped structures; the sixth E-surface waveguide resonant cavity, the ninth E-surface waveguide resonant cavity and the tenth E-surface waveguide resonant cavity are all in plate-shaped structures; one end of the fifth E-plane waveguide resonant cavity is connected with the OMT, and the other end of the fifth E-plane waveguide resonant cavity is connected with the sixth E-plane waveguide resonant cavity; one end of the sixth E-plane waveguide resonant cavity is connected with one end of the fifth E-plane waveguide resonant cavity, and the other end of the sixth E-plane waveguide resonant cavity is connected with the seventh E-plane waveguide resonant cavity; one end of the seventh E-plane waveguide resonant cavity is connected with the sixth E-plane waveguide resonant cavity, and the other end of the seventh E-plane waveguide resonant cavity is connected with the eighth E-plane waveguide resonant cavity; one end of the eighth E-plane waveguide resonant cavity is connected with the seventh E-plane waveguide resonant cavity, and the other end of the eighth E-plane waveguide resonant cavity is connected with the ninth E-plane waveguide resonant cavity; one end of the ninth E-plane waveguide resonant cavity is connected with one end of the eighth E-plane waveguide resonant cavity, and the other end of the ninth E-plane waveguide resonant cavity is connected with the tenth E-plane waveguide resonant cavity; one end of the tenth E-plane waveguide resonant cavity is connected with one end of the ninth E-plane waveguide resonant cavity, and the other end of the tenth E-plane waveguide resonant cavity is connected with the receiving port b.

In conclusion, owing to adopted above-mentioned technical scheme, the utility model discloses following beneficial effect has at least:

1. the utility model arranges the receiving path filter and the transmitting path filter in a plane different from the combining port, so that the combining port can perform signal interaction with the antenna at the center of the belly of the whole machine system, and the size of the connection with the antenna is greatly reduced from the middle of the belly of the whole machine system; meanwhile, the filter cavity in the filter is correspondingly designed to be bent in space, so that the isolation degree of the duplexer is increased, and the structure of the duplexer is more compact and more miniaturized; therefore, the overall size of the satellite ground station is reduced, and the miniaturization of the satellite ground station is realized;

2. the novel duplexer adopts the circular waveguide-rectangular waveguide transition c1, the first rectangular-rectangular waveguide vertical polarization direction transition a1 and the second rectangular-rectangular waveguide horizontal polarization direction transition b1 in the OMT to be optimized in a cascade manner, so that the polarization isolation of the OMT is increased;

3. the novel duplexer of the utility model is skillfully designed in the OMT, so that the OMT is miniaturized, and the transition between the OMT and the transmitting filter and the receiving filter is miniaturized; the transition a1 adopts multi-stage rectangular waveguide cascade connection (step-shaped), so that the size of the duplexer is greatly reduced, and the bandwidth of the duplexer is increased; the transition c1 adopts the design of a rectangular waveguide with a large inverted round angle, so that the transition miniaturization from a round waveguide to a rectangular waveguide is realized;

4. the utility model discloses a novel duplexer adopts full E face waveguide resonant cavity at receiving filter, and the transmission filter resonant cavity adopts the space to go up H face commentaries on classics E face model, has reduced the space size, has solved the duplexer structure and has added the big problem of full H face structure subdivision loss man-hour.

5. The utility model discloses a novel duplexer adopts unilateral diaphragm coupling mode receiving and transmitting filter, reduces the duplexer processing degree of difficulty and processing cost.

Drawings

Fig. 1 is a schematic structural diagram of a high-bandwidth ku-band two-port duplexer in the prior art.

Fig. 2 is a schematic diagram of a quadrature coupler in the prior art.

Fig. 3 is a schematic connection diagram of a common port of a duplexer interacting with an antenna at an ODU side in the prior art.

Fig. 4 is a schematic connection diagram of a duplexer combiner port interacting with an antenna system from the middle of the abdomen of the whole device according to an exemplary embodiment of the present invention.

Fig. 5 is a schematic structural diagram 1 of a novel duplexer according to an exemplary embodiment of the present invention.

Fig. 6 is a diagram of simulation results of the novel duplexer of the present invention, which is shown in fig. 1.

Fig. 7 is a diagram of simulation results of the novel duplexer of the present invention shown in fig. 2.

Fig. 8 is a diagram of simulation results of the novel duplexer of the present invention shown in fig. 3.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and embodiments, so that the objects, technical solutions and advantages of the present invention will be more clearly understood. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Fig. 5 and 6 show a novel duplexer according to an exemplary embodiment of the present invention. The novel duplexer of this embodiment mainly includes:

the transmission port a is a transmission signal input port of the transceiver ODU, the reception port b is a reception signal output port of the transceiver ODU, and the combiner port c is a common port where a duplexer and an antenna signal interact with each other.

The circular combining port c is used as a z-axis, and a space coordinate system is established; one end of the combining port c extends in the negative direction of the z axis to perform signal interaction with an antenna signal, and the other end of the combining port c is connected with the OMT along the positive direction of the z axis; the combining port c is respectively connected with the transmitting path filter a2 and the receiving path filter b2 through the OMT; the transmit path filter a2 extends in the xy plane to form a transmit port a, and the receive path filter b2 extends in the xy plane to form a receive port b. At the moment, the transmitting path filter, the receiving path filter and the combining port on the z axis are not in the same plane, so that a novel space duplexer is formed, and the whole structure can be greatly reduced when the novel space duplexer is placed in transceivers with frequency bands such as ka frequency band and ku frequency band. Thereby improving OUD overall signal isolation and reducing overall size, and finally forming the structure connected with the antenna as shown in fig. 4. Extending in the xy-plane is herein a broad extension, i.e. the length extending in the xy-plane is much larger than the variation in the z-direction, such as more than 3: length change ratio of 1.

Specifically, in actual operation, a signal input port a is transmitted by a transceiver ODU transmission unit, and is transmitted to an antenna through an OMT and a combiner port c, the antenna transmits the signal to a satellite, and the antenna receives the signal transmitted by the satellite and transmits the signal to a transceiver ODU receiving unit through the combiner port c, the OMT and a duplexer output port b.

Further, the OMT comprises: a circular waveguide-rectangular waveguide transition c1, a first rectangular-rectangular waveguide vertical polarization direction transition a1, and a second rectangular-rectangular waveguide horizontal polarization direction transition b 1; one end of the circular waveguide-rectangular waveguide transition c1 (adopting a rectangular waveguide reverse large fillet design, and realizing the transition miniaturization from the circular waveguide to the rectangular waveguide) is connected to the combining port c, and the other end is connected to the first rectangular-rectangular waveguide vertical polarization direction transition a1 and the second rectangular-rectangular waveguide horizontal polarization direction transition b1, respectively. Where a1 employs a multi-stage rectangular waveguide cascade and b1 is located in the side arm portion of the OMT. The size of a1 is adjusted, and the insertion loss, standing wave performance and the separation height of signals in a receiving path of the OMT can be adjusted; the size and the position of the cl can be adjusted, the insertion loss and the standing wave performance of a receiving path signal of the OMT and the isolation degree of a signal in a transmitting path can be adjusted, the size of the b1 can be adjusted, and the insertion loss and the standing wave performance of the OMT can be adjusted.

Specifically, as shown in fig. 5, the first rectangular-rectangular waveguide vertical polarization direction transition a1 is in a multistage step shape after being cascaded by using multistage rectangular waveguides; and a step-shaped waveguide transition section is adopted, so that the size of the duplexer is greatly reduced, and the bandwidth of the duplexer is increased. The waveguide transition step number of 5 exemplars in the figure is 8 orders, in the utility model discloses the preferred embodiment, cascades the step with the waveguide and sets up to 6 orders, under the circumstances that the polarization isolation ability of guaranteeing the duplexer is optimum, does benefit to the miniaturization of complete machine structure the most. The step bottom of the stepped first rectangular-rectangular waveguide vertical polarization direction transition a1 is connected to the transmit path filter a 2. One end of the transmitting path filter a2 is connected with the first rectangular-rectangular waveguide vertical polarization direction transition a1, and the other end is bent and extended in the negative half-axis space of the x-axis to form a transmitting port a positioned in the negative half-axis of the x-axis. The second rectangular-rectangular waveguide horizontal polarization direction transition b1 is located on one side of the 5-step stepped waveguide transition a1 and is connected to the receive path filter b 2. One end of the receiving path filter b2 is connected with the second rectangular-rectangular waveguide horizontal polarization direction transition b1, and the other end is bent and extended in the positive half-axis space of the x axis to form a receiving port b located in the positive half-axis of the x axis, so that the transmitting port a and the receiving port b are respectively located at two sides of the combining port c with the central line in the z axis, and a spatial structure with the combining port c in the center as shown in fig. 5 is formed.

Furthermore, the transmitting path filter and the receiving path filter comprise a plurality of waveguide resonant cavities, each waveguide resonant cavity comprises an E-surface waveguide resonant cavity and an H-surface waveguide resonant cavity, the E-surface waveguide resonant cavity is a waveguide resonant cavity with a transverse section parallel to the electric field direction, and the H-surface waveguide resonant cavity is a waveguide resonant cavity with a transverse section parallel to the magnetic field direction. Specifically, a full E-plane waveguide resonant cavity is adopted in the receiving filter, and an H-plane waveguide resonant cavity is changed to the E-plane waveguide resonant cavity in space in the transmitting filter, so that the space size is reduced, and the problem of large full H-plane subdivision loss during duplexer structure processing is solved.

Specifically, the transmitting path filter a2 includes four waveguide resonators with adjustable size and position, including a first H-plane waveguide resonator, a second E-plane waveguide resonator (if the E-plane for the first waveguide resonator would cause the excessive size of the connection between the filter and the OMT to be too long, it cannot be miniaturized, so that the better performance and the structural miniaturization can be realized by transforming the H-plane waveguide resonator to the E-plane waveguide resonator for the transmitting filter), a third E-plane waveguide resonator, and a fourth E-plane waveguide resonator. And the waveguide cavities are cascaded by the diaphragms (i.e. the tooth-like gaps between the waveguide resonant cavities in fig. 5). The size and position of the waveguide resonant cavity and the diaphragm are adjusted, so that the center frequency, the insertion loss, the standing wave performance, the bandwidth of a passband of a transmitting channel signal and the out-of-band rejection of a receiving channel signal can be adjusted.

The first H-plane waveguide resonant cavity and the second E-plane waveguide resonant cavity are both in plate structures, and the third E-plane waveguide resonant cavity and the fourth E-plane waveguide resonant cavity are both in L-shaped structures. The smallest surface of the plate-like structure and the L-shaped structure is defined as an end surface, and the larger surface is a side surface. As can be seen from fig. 5, one end surface of the first H-plane waveguide resonant cavity is connected to the step bottom of the step transition a1 of the OMT, and the other end surface is connected to the side surface of the second E-plane waveguide resonant cavity, so as to realize the conversion from the H-plane waveguide to the E-plane waveguide. One side surface of the second E-surface waveguide resonant cavity is connected with the end surface of the first H-surface waveguide resonant cavity, and one end surface of the second E-surface waveguide resonant cavity is connected with one end surface of a third E-surface waveguide resonant cavity in an L-shaped structure. One end face of the third E-plane waveguide resonant cavity is connected with the second E-plane waveguide resonant cavity, and the other end face of the third E-plane waveguide resonant cavity is connected with one end face of the fourth E-plane waveguide resonant cavity in an L-shaped structure. And one end face of the fourth E-plane waveguide resonant cavity in an L-shaped structure is connected with one end face of the third E-plane waveguide resonant cavity, and the other end face is connected with the transmitting port a, and finally, a spatial bending structure as shown in fig. 5 is formed, so that a spatial special-shaped transmitting path filter is formed. Therefore, the size of the whole duplexer is reduced while the isolation degree of the duplexer signals is improved through the space bending structure.

Further, the receiving path filter b2 includes six size-adjustable and position-adjustable E-plane waveguide resonant cavities, including a fifth waveguide resonant cavity, a sixth waveguide resonant cavity, a seventh waveguide resonant cavity, an eighth waveguide resonant cavity, a ninth waveguide resonant cavity, and a tenth waveguide resonant cavity.

The fifth waveguide resonant cavity, the seventh waveguide resonant cavity and the eighth waveguide resonant cavity are all in L-shaped structures; the sixth waveguide resonant cavity, the ninth waveguide resonant cavity and the tenth waveguide resonant cavity are all of plate-shaped structures. One end face of the fifth waveguide resonant cavity in the L-shaped structure is connected with the horizontal polarization transition section b1 in the OMT, and the other end face thereof is connected with one end face of the sixth waveguide resonant cavity. One end face of the sixth waveguide resonant cavity is connected with one end face of the fifth waveguide resonant cavity, and the other end face of the sixth waveguide resonant cavity is connected with one end face of the seventh waveguide resonant cavity in an L-shaped structure. One end face of the seventh waveguide resonant cavity in the L-shaped structure is connected with one end face of the sixth waveguide resonant cavity, and the other end face of the seventh waveguide resonant cavity is connected with one end face of the eighth waveguide resonant cavity in the L-shaped structure. One end face of the eighth E-plane waveguide resonant cavity in the L-shaped structure is connected with one end face of the seventh E-plane waveguide resonant cavity in the L-shaped structure, and the other end face of the eighth E-plane waveguide resonant cavity is connected with one end face of the ninth waveguide resonant cavity. One end face of the ninth waveguide resonant cavity is connected with one end face of the eighth waveguide resonant cavity, and the other end face of the ninth waveguide resonant cavity is connected with one end face of the tenth waveguide resonant cavity. And one end face of the tenth waveguide resonant cavity is connected with one end face of the ninth waveguide resonant cavity, and the other end face of the tenth waveguide resonant cavity is connected with the receiving port b. Finally, a space bending structure as shown in fig. 5 is formed to form a space special-shaped receiving path filter. Therefore, the size of the whole duplexer is reduced while the isolation degree of the duplexer signals is improved through the space bending structure.

In a further embodiment of the present invention, we have performed simulation tests on each port of the novel duplexer (the duplexer is disposed in the ODU transceiver of the ku band). Fig. 6 shows the simulation result of the S parameter between the b port and the c port in the novel exemplary duplexer of the present invention, and it can be seen from the figure that the pass bands of the b port and the c port are 12.2GHz to 12.8GHz, and the insertion loss is less than 0.10 dB. Fig. 7 shows the simulation result of the S parameter between the a port and the c port in the novel exemplary duplexer of the present invention, and it can be seen from the figure that the pass bands of the a port and the c port are 13.8GHz to 14.7GHz, and the insertion loss is less than 0.1 dB. As shown in fig. 8, the in-band isolation between the a port and the b port of the novel duplexer of the present invention is greater than 120 dB.

In summary, the utility model miniaturizes the OMT (and miniaturizes the OMT with the transmission filter and the reception filter), and sets the reception path filter and the transmission path filter in a plane different from the combining port, so that the combining port can be in the center of the abdomen of the whole system (as shown in fig. 4); and then, the filter cavity in the filter is correspondingly designed to be bent in space, so that the isolation of the duplexer is increased, and the structure of the duplexer is more compact and more miniaturized.

The above description is only for the purpose of illustrating the embodiments of the present invention, and not for the purpose of limiting the same. Various substitutions, modifications and improvements may be made by those skilled in the relevant art without departing from the spirit and scope of the invention.

Claims

1. A novel duplexer, comprising:

the device comprises a transmitting port, a receiving port, a combining port, an OMT, a transmitting path filter and a receiving path filter;

the transmitting port is a transmitting signal input port of a transceiver ODU, the receiving port is a receiving signal output port of the transceiver ODU, and the combining port is a common port for interaction of a duplexer and an antenna signal;

the circular combining port is used as a z-axis, and a space coordinate system is established; one end of the combining port extends in the negative direction of the z axis to perform signal interaction with an antenna signal, and the other end of the combining port is connected with the OMT along the positive direction of the z axis; the combining port is respectively connected with the transmitting path filter and the receiving path filter through the OMT; the transmitting path filter extends in the xy plane to form a transmitting port, and the receiving path filter extends in the xy plane to form a receiving port.

2. The duplexer of claim 1, wherein the OMT comprises: circular waveguide-rectangular waveguide transition, first rectangular-rectangular waveguide vertical polarization direction transition and second rectangular-rectangular waveguide horizontal polarization direction transition;

the circular waveguide-rectangular waveguide transition adopts a rectangular waveguide inverted large round angle design, one end of the circular waveguide-rectangular waveguide transition is connected with the combining port, and the other end of the circular waveguide-rectangular waveguide transition is respectively connected with the first rectangular-rectangular waveguide vertical polarization direction transition and the second rectangular-rectangular waveguide horizontal polarization direction transition;

the first rectangular-rectangular waveguide is transited to a multistage step-shaped waveguide transition section in the vertical polarization direction, and the step bottom of the first rectangular-rectangular waveguide transition section is connected with the transmitting path filter; and the second rectangular-rectangular waveguide horizontal polarization direction transition is positioned on one side of the multistage step-shaped waveguide transition section and is connected with the receiving channel filter.

3. The duplexer according to claim 2, wherein one end of the transmit path filter is transitionally connected with the first rectangular-rectangular waveguide in the vertical polarization direction, and bends and extends in the space of the negative half axis of the x axis to form a transmit port located in the negative half axis of the x axis;

one end of the receiving path filter is in horizontal polarization direction transition with the second rectangular-rectangular waveguide, and bends and extends in the space of the positive half shaft of the x axis to form a receiving port positioned on the positive half shaft of the x axis, so that the transmitting port and the receiving port are respectively positioned on two sides of the combining port of which the central line is positioned on the z axis.

4. The duplexer of any one of claims 1 to 3, wherein the transmit path filter comprises four adjustable-size-and-position waveguide resonators, namely a first H-plane waveguide resonator, a second E-plane waveguide resonator, a third E-plane waveguide resonator and a fourth E-plane waveguide resonator;

the first H-plane waveguide resonant cavity and the second E-plane waveguide resonant cavity are both in a plate-shaped structure, and the third E-plane waveguide resonant cavity and the fourth E-plane waveguide resonant cavity are both in an L-shaped structure; one end of the first H-plane waveguide resonant cavity is connected with the OMT, and the other end of the first H-plane waveguide resonant cavity is connected with the second E-plane waveguide resonant cavity; one end of the second E-plane waveguide resonant cavity is connected with the first H-plane waveguide resonant cavity, and the other end of the second E-plane waveguide resonant cavity is connected with the third E-plane waveguide resonant cavity in the L-shaped structure; one end of the third E-plane waveguide resonant cavity is connected with the second E-plane waveguide resonant cavity, and the other end of the third E-plane waveguide resonant cavity is connected with the fourth E-plane waveguide resonant cavity; one end of the fourth E-plane waveguide resonant cavity is connected with the third E-plane waveguide resonant cavity, and the other end of the fourth E-plane waveguide resonant cavity is connected with the transmitting port.

5. The duplexer of any one of claims 1 to 3, wherein the receive path filter comprises six adjustable-size-and-position waveguide resonators including a fifth E-plane waveguide resonator, a sixth E-plane waveguide resonator, a seventh E-plane waveguide resonator, an eighth E-plane waveguide resonator, a ninth E-plane waveguide resonator, and a tenth E-plane waveguide resonator;

the fifth E-plane waveguide resonant cavity, the seventh E-plane waveguide resonant cavity and the eighth E-plane waveguide resonant cavity are all in L-shaped structures; the sixth E-surface waveguide resonant cavity, the ninth E-surface waveguide resonant cavity and the tenth E-surface waveguide resonant cavity are all in plate-shaped structures; one end of the fifth E-plane waveguide resonant cavity is connected with the OMT, and the other end of the fifth E-plane waveguide resonant cavity is connected with the sixth E-plane waveguide resonant cavity; one end of the sixth E-plane waveguide resonant cavity is connected with one end of the fifth E-plane waveguide resonant cavity, and the other end of the sixth E-plane waveguide resonant cavity is connected with the seventh E-plane waveguide resonant cavity; one end of the seventh E-plane waveguide resonant cavity is connected with the sixth E-plane waveguide resonant cavity, and the other end of the seventh E-plane waveguide resonant cavity is connected with the eighth E-plane waveguide resonant cavity; one end of the eighth E-plane waveguide resonant cavity is connected with the seventh E-plane waveguide resonant cavity, and the other end of the eighth E-plane waveguide resonant cavity is connected with the ninth E-plane waveguide resonant cavity; one end of the ninth E-plane waveguide resonant cavity is connected with one end of the eighth E-plane waveguide resonant cavity, and the other end of the ninth E-plane waveguide resonant cavity is connected with the tenth E-plane waveguide resonant cavity; one end of the tenth E-plane waveguide resonant cavity is connected with one end of the ninth E-plane waveguide resonant cavity, and the other end of the tenth E-plane waveguide resonant cavity is connected with a receiving port.