High-power high-isolation broadband orthogonal mode coupler

Abstract

The invention discloses a high-power high-isolation broadband orthogonal mode coupler which comprises a circular-truncated-cone-shaped coupling cavity, a mode separation cavity, a mode matching step, an annular combining waveguide and a twisted waveguide, the circular-truncated-cone-shaped coupling cavity is connected with the mode separation cavity, the circular-truncated-cone-shaped matching step is arranged in the mode separation cavity, and the mode separation cavity is further provided with four rectangular ports. The four rectangular ports are connected with the two annular combining waveguides after passing through the matching step, the annular combining waveguides are connected with the twisted waveguide after being combined, and the twisted waveguide is connected with the final rectangular waveguide output port through the matching step. According to the present invention, the electrical performance is excellent, the structure is compact, the processing and the manufacturing are easy, the operation can be performed under the megawatt power, the simulation and actual measurement results show that the linear polarization mode phase separation can be achieved, the good standing wave, isolation, insertion loss and other indexes are provided, and the important improvement of the prior art is provided.

Description

Technical Field

[0001] This invention relates to the field of orthogonal mode coupler technology, and more particularly to a high-power, high-isolation broadband orthogonal mode coupler. Background Technology

[0002] Currently, ortho-mode transducers (OMTs) are a core component of dual-polarized systems, capable of directly synthesizing / separating dual-polarized signals and solving frequency reuse problems. As the first stage connected to the antenna, the bandwidth of the OMT directly determines the operating bandwidth of the dual-polarized communication system; therefore, broadband OMTs have broad application prospects.

[0003] Orthogonal mode couplers are key components for achieving dual-polarization feeding in power supply networks. Their main function is to distinguish between two orthogonal master modes (TE) at a common port. 10 and TE 01 The two orthogonally polarized single-mode ports of an OMT (Optical Mode Transmission Machine) can be used as signal transmitters and receivers respectively, enabling polarization-duplex transmission of signals in different frequency bands. This allows all electrical ports to be matched and have high cross-polarization discrimination between independent signals.

[0004] OMTs (Optical Transmission Mediators) come in various structures, categorized into symmetrical and antisymmetric structures. Antisymmetric OMTs offer the advantage of simplicity and low cost, but their bandwidth is limited. The OMT proposed in this invention features a symmetrical structure. This type of OMT can suppress some higher-order mode excitation, achieving higher isolation and a wider bandwidth. The proposed OMT model is simple to fabricate. It solves the mode interference problem through an asymmetric twisted waveguide, improving isolation and bandwidth. Adjusting the model size allows it to adapt to different operating frequencies. It can be fabricated as a single unit. Furthermore, internal chamfering and the use of high-pressure sulfur hexafluoride gas enable the OMT to operate normally at megawatt-level power, representing a significant improvement over existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a high-power, high-isolation broadband orthogonal mode coupler that enables equal-phase signal transmission of microwave signals from a common circular port to two orthogonal rectangular ports. It can achieve equal-phase separation of linearly polarized modes and also achieve the synthesis of equal-phase linearly polarized modes in reverse. By adjusting the model size, it can be adapted to different operating frequencies.

[0006] The technical solution adopted in this invention is as follows: A high-power, high-isolation broadband orthogonal mode coupler includes a frustum-shaped coupling cavity 1, a mode separation cavity 2, a waveguide matching ladder 3, a ring combining waveguide 4, and a twisted waveguide 5. The bottom of the frustum-shaped coupling cavity is connected to the mode separation cavity 2, and the lower surface of the frustum-shaped coupling cavity is coplanar with the upper surface of the mode separation cavity 2. The four output ports of the mode separation cavity 2 are respectively connected to the waveguide matching ladder, and the other end of the waveguide matching ladder is connected to the ring combining waveguide 4. The four waveguide matching ladders are divided into two groups, with two on the same straight line. The waveguide matching ladder is connected to the same segment of the ring combining waveguide 4. The ring combining waveguide 4 consists of two short waveguides and one long waveguide. The two short waveguides are connected to the waveguide matching ladder respectively. The two short waveguides are rotated 90 degrees towards each other and then connected through the long waveguide. The two ring combining waveguides 4 are symmetrical about the center of the frustum coupler at 90 degrees. The waveguide synthesis structure of the ring combining waveguide 4 is located at about one-third of the length of the long waveguide, where there is a waveguide ridge structure. The other end of the waveguide synthesis structure is connected to the twisted waveguide 5 through a matching transition section.

[0007] One end of the frustum-shaped coupling cavity 1 is a common circular waveguide feed port 101, and the other end is connected to the mode separation cavity 2 through a waveguide matching frustum 102.

[0008] The mode separation cavity 2 consists of two orthogonal and partially overlapping rectangular waveguide cavities. The center of the overlapping position of the rectangular waveguide cavities is located at one-third of the distance between the two rectangular waveguide cavities. The overlapping part of the rectangular waveguide cavities is connected to the frustum-shaped coupling cavity. There is another matching frustum inside the cavity of the connected part. The matching frustum in the mode separation cavity 2 is concentric with the frustum-shaped coupling cavity, and its center is located at the center of the overlapping part of the two orthogonal and partially overlapping rectangular waveguide cavities.

[0009] The output port of the microwave-synthesized ring combining waveguide 4 is connected to its respective twisted waveguide 5 through a waveguide transition section, and the two ring combining waveguides 4 are symmetrical about 90 degrees.

[0010] The rectangular waveguide cavity of the two mode separation cavities 2 and the two annular combining waveguides 4 and their matching step 3 have the same structure and are 90 degrees rotationally symmetrical about the center of the frustum-shaped coupling cavity.

[0011] The twisted waveguide 5 is different from the ring combining waveguide 4. The two twisted waveguides 5 are asymmetrical structures. One twisted waveguide 5 first twists away from the waveguide combining point, and then twists away from the waveguide combining point again. The other twisted waveguide 5 first twists away from the waveguide combining point, and then twists towards the waveguide combining point. This forms a twisted waveguide 5 structure with asymmetry at both ends.

[0012] The diameter of the frustum coupling cavity 1 gradually increases from top to bottom, and there are small matching frustum structures inside, with the two matching frustums being concentric.

[0013] The frustum coupling cavity 1, mode separation cavity 2, waveguide matching ladder 3, annular combining waveguide 4, and twisted waveguide 5 are all made of metal.

[0014] The annular combining waveguide 4 has chamfered structures at both the bending and combining positions, and the twisted waveguide 5 also has corresponding chamfered structures at the turning points.

[0015] The input port above the frustum coupler is a common port, while the output ports of the two matched stepped waveguides connected to the twisted waveguide 5 are orthogonal and independent signal ports.

[0016] The torsional waveguide structure of the orthogonal mode coupler of the present invention adopts an asymmetrical structure, which can improve the compactness of the device on the one hand, and solve the mode interference problem on the other hand, thus greatly improving the operating bandwidth of the orthogonal mode coupler.

[0017] This invention features a compact structure, low cost, ease of fabrication, wide bandwidth, high isolation, high power tolerance, and good electrical properties. It has been successfully fabricated in practice for mode coupling in the S / C / Ku bands, achieving excellent experimental results and representing a significant improvement over existing technologies. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the simulation structure of the present invention; Figure 2 yes Figure 1 Perspective view; Figure 3 yes Figure 1 Top view; Figure 4 This is an assembly diagram of the high-power, high-isolation broadband orthogonal mode coupler in an embodiment of the present invention; Figure 5 yes Figure 3 Equidistant assembly drawing (forward); Figure 6 yes Figure 3 Equidistant assembly drawing (negative direction); Figure 7 This is a schematic diagram of the electric field when a single-port feed of 2MW power is used for mode synthesis in an orthogonal mode coupler. Figure 8 This is a schematic diagram of the electric field when 2MW of power is fed into each of the two ports during mode synthesis of an orthogonal mode coupler.

[0020] Frustum coupling cavity 1, mode separation cavity 2, waveguide matching ladder 3, ring combining waveguide 4, twisted waveguide 5, feed port 101, waveguide matching frustum 102, upper layer 201 of mode separation cavity 2, lower layer 202 of mode separation cavity 2, upper layer 301 of waveguide matching ladder, lower layer 302 of waveguide matching ladder, upper layer 303 of waveguide matching ladder, lower layer 304 of waveguide matching ladder, output port 305, upper layer 401 of ring combining waveguide, lower layer 402 of ring combining waveguide, upper layer 501 of twisted waveguide, lower layer 502 of twisted waveguide. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 , 2 As shown in Figure 3, the present invention includes a frustum-shaped coupling cavity 1, a mode separation cavity 2, a waveguide matching ladder 3, a ring-shaped combining waveguide 4, and a twisted waveguide 5. The bottom of the frustum-shaped coupling cavity is connected to the mode separation cavity 2, and the lower surface of the frustum-shaped coupling cavity is coplanar with the upper surface of the mode separation cavity 2. The four output ports of the mode separation cavity 2 are respectively connected to the waveguide matching ladder, and the other end of the waveguide matching ladder is connected to the ring-shaped combining waveguide 4. The four waveguide matching ladders are divided into two groups, with two waveguide matching ladders on the same straight line. The two short waveguides 4 are connected to the same ring combining waveguide 4. The ring combining waveguide 4 consists of two short waveguides and one long waveguide. The two short waveguides are connected to the waveguide matching ladder respectively. The two short waveguides are rotated 90 degrees towards each other and then connected through the long waveguide. The two ring combining waveguides 4 are symmetrical about the center of the truncated cone coupler at 90 degrees. The waveguide synthesis structure of the ring combining waveguide 4 is located at about one-third of the length of the long waveguide, where there is a waveguide ridge structure. The other end of the waveguide synthesis structure is connected to the twisted waveguide 5 through a matching transition section.

[0023] Unlike the ring combining waveguide 4, the two twisted waveguides 5 are asymmetrical structures. One twisted waveguide 5 is first twisted away from the waveguide combining point by 90 degrees, and then twisted again away from the waveguide combining point by 45 degrees. The other twisted waveguide 5 is first twisted away from the waveguide combining point by 90 degrees, and then twisted closer to the waveguide combining point by 45 degrees. This structure can effectively solve the mode interference problem. The two twisted waveguides 5 are finally connected to a matching ladder section.

[0024] The orthogonal mode coupler provided by the present invention has an integrated structure. The two-section mode separation cavity 2 and the two-section ring combining waveguide 4 are orthogonally stacked to improve the compactness of the device. The manufacturing method is simple and can be integrated.

[0025] One end of the frustum-shaped coupling cavity 1 is a common circular waveguide feed port 101, and the other end is connected to the mode separation cavity 2 via a waveguide matching frustum 102. This design makes the structure more compact, facilitates system integration and installation, and enables a smooth transition of microwaves from the circular waveguide to the mode separation cavity through the gradual change of the frustum. Combined with the internal matching frustum to optimize impedance matching and reduce return loss, it supports high-efficiency microwave transmission. At the same time, the integrated frustum and matching structure enhance the mechanical stability and electric field uniformity of the cavity, which is conducive to improving power capacity and providing stable input conditions for subsequent mode separation. Its coaxial design also simplifies the processing and assembly process and is suitable for high-precision integrated manufacturing.

[0026] The mode separation cavity 2 consists of two orthogonal and partially overlapping rectangular waveguide cavities. The center of the overlap is located at one-third of the distance between the two rectangular waveguide cavities. The overlapping portion of the rectangular waveguide cavities connects to a frustum-shaped coupling cavity. Within the connecting portion of the cavity, there is another matching frustum. The matching frustum in mode separation cavity 2 is concentric with the frustum-shaped coupling cavity, and its center is located at the center of the overlapping portion of the two orthogonal and partially overlapping rectangular waveguide cavities. This structure allows the two orthogonal rectangular waveguide cavities to be nested within each other in a 90-degree rotational symmetry configuration, achieving an efficient dual-channel layout within a limited space and significantly improving the overall structural compactness. Simultaneously, the rational positioning of the overlapping area and the coordination of the concentric frustums facilitate good impedance matching and field mode transition in the initial stage of mode separation, thereby ensuring low-loss and high-isolation transmission of the two orthogonal modes in their respective channels, laying the foundation for subsequent broadband and high-isolation performance.

[0027] The output ports of the microwave-synthesized annular combining waveguide 4 are connected to their respective twisted waveguides 5 via waveguide transition sections, with the two annular combining waveguides 4 being symmetrical about 90 degrees. This symmetrical layout not only maintains the balance and compactness of the structure in the circumferential direction, but more importantly, its combining position exhibits geometric asymmetry, effectively compensating for the phase deviation introduced by the difference in physical length between the two orthogonal waveguides in the mode separation cavity 2. Through this carefully designed structure combining symmetry and asymmetry, the phase of the two signals can be automatically corrected before synthesis, thereby achieving equal-phase synthesis, ensuring phase consistency of the signals in subsequent transmission, and improving the isolation and bandwidth performance of the entire orthogonal mode coupler.

[0028] The rectangular waveguide cavities of the two mode separation cavities 2, the two annular combining waveguides 4, and their matching step 3 are structurally identical and are 90 degrees rotationally symmetrical about the center of the frustum-shaped coupling cavity. This highly symmetrical "cross-shaped" layout not only ensures that the two orthogonal signal channels have consistent impedance characteristics and phase response electrically, but also helps to suppress high-order mode coupling and parasitic resonance caused by structural asymmetry. In addition, the symmetrical design simplifies fabrication and debugging; only the parameters of a set of symmetrical units need to be optimized to achieve a balanced improvement in overall performance, further ensuring that the orthogonal mode coupler has good isolation and transmission stability over a wide bandwidth.

[0029] The diameter of the frustum coupling cavity 1 gradually increases from top to bottom, but the maximum radius of the matching frustum is smaller than the minimum radius of the frustum coupling cavity 1, and there is a small matching frustum structure inside, with the two matching frustums being concentric. This gradually concentric frustum structure achieves a continuous impedance transition from the circular waveguide to the subsequent mode separation cavity, effectively reducing reflection loss caused by abrupt changes in cross-section, thereby significantly improving the overall impedance matching performance.

[0030] The frustum coupling cavity 1, mode separation cavity 2, waveguide matching step 3, annular combining waveguide 4, and twisted waveguide 5 are all made of aluminum. The annular combining waveguide 4 has chamfered structures at both the bend and combining points, and the twisted waveguide 5 also has corresponding chamfered structures at the bends. Aluminum is lightweight and easy to precision machine, perfectly meeting the high-precision integral molding requirements of the complex internal structure of this invention (such as the matching step and chamfers), significantly reducing processing difficulty and manufacturing costs. Its good thermal conductivity also helps with device heat dissipation. Combined with the internal high-pressure sulfur hexafluoride gas filling and the chamfered design at key locations, the aluminum structure can meet the insulation, withstand voltage, and stability requirements for megawatt-level power operation.

[0031] In practical applications, by Figure 2 Perspective view and Figure 4 As can be seen from the right view, the matching ladder connecting the mode separation cavity 2 and the ring combining waveguide 4 consists of two three-stage matching ladders. The mode separation cavity 2 includes an upper separation cavity 201 and a lower mode separation cavity 202, which are interlocked. The twisted waveguide is also obtained by interlocking the upper twisted waveguide 501 and the lower twisted waveguide 502.

[0032] First, the mode separation cavity 2 is connected via a three-stage matching ladder. The three-stage matching ladder includes an upper waveguide matching ladder 301, a lower waveguide matching ladder 302, an upper waveguide matching ladder 303, and a lower waveguide matching ladder 304. Finally, the rectangular waveguide port in the horizontal direction is bent downwards at 90 degrees with the long side as the axis through the output port 305. Then, the rectangular waveguide port in the vertical direction is bent horizontally at 90 degrees with the short side as the axis through another three-stage matching ladder. Then, it is connected to the ring combining waveguide 4 (i.e., the upper ring combining waveguide 401 and the lower ring combining waveguide 402 in the figure are connected and set together). The four rectangular waveguide ports leading out from the mode separation cavity 2 are all connected to two three-stage matching ladders to achieve the above bending. Depend on Figure 3 As can be seen from the top view, mode separation cavity 2 consists of two orthogonal and partially overlapping rectangular waveguide cavities. The center of the overlap between the two rectangular waveguide cavities is located at one-third of the distance between the two rectangular waveguide cavities. Four rectangular waveguides leading out from the two rectangular waveguide cavities are connected to the ring combining waveguide 4 after passing through matching steps. Furthermore, two rectangular waveguide ports leading out from the same rectangular waveguide cavity are connected to the same ring combining waveguide 4. The ring combining waveguide 4 consists of two short waveguides and one long waveguide. The rectangular waveguide ports of the two short waveguides are connected by matching steps. The short waveguides are bent 90 degrees in opposite directions and then connected to each other to form a long waveguide section. The waveguide combining cavity is located at one-third of the length of the long waveguide of the annular combining waveguide 4, where there is a rectangular waveguide ridge structure. After combining, the waveguide combining cavity is connected to a waveguide matching structure perpendicular to it. The two annular combining waveguides 4 are symmetrical about the center of the frustum coupler at 90 degrees. The bends of the annular combining waveguides 4 are all chamfered, and the chamfer radius on the outer side of the bend is larger than that on the inner side of the bend. The rectangular waveguide ridge structure and the matching structure of the waveguide combining cavity are also chamfered. Assembly diagram of high-power, high-isolation broadband orthogonal mode coupler as shown below Figure 4 As shown, Figure 5 , Figure 6 The diagram shows equidistant assembly drawings from both the forward and reverse directions. As can be seen from the diagram, in practical applications, the coupler assembly consists of three layers, each secured with screws and sealed with rubber rings. Microwave energy is transmitted through a waveguide cavity filled with high-pressure sulfur hexafluoride gas, capable of handling megawatt-level power. The waveguide's sealing must be ensured during fabrication.

[0033] To further explain and illustrate this invention, the following detailed description of the working process is provided: In practical applications, this invention is divided into different scenario modes. Specifically, in the mode separation scenario, microwave energy is fed in through the circular waveguide port of the frustum coupling structure. The mode separation cavity 2 separates the microwave mode into two mutually orthogonal modes, which are then transmitted through two rectangular cavities. Each rectangular cavity has two ports, which are connected to the ring combining waveguide 4 through the waveguide matching ladder 3, so that the microwave energy of the same mode can be combined again and output through the twisted waveguide 5 and the waveguide matching ladder 3. This achieves equal-phase transmission of microwave energy from the common port to the two independent orthogonal ports.

[0034] In the mode synthesis scenario, equal-phase microwave energy is fed in from two independent orthogonal ports, passes through waveguide matching step 3, twisted waveguide 5, ring combining waveguide 4, and mode separation cavity 2, and is output from the circular waveguide port. At this time, the OMT equipment exhibits excellent isolation. Figure 7 and Figure 8 The simulated electric field diagrams are shown when 2MW of power is fed into a single port and when 2MW of power is fed into two ports respectively.

[0035] In the description of this invention, it should be noted that directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0036] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0037] Note that the above description is merely a preferred embodiment and application of the technical principles of the present invention. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the specific embodiments described herein, and may include many other effective embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A high-power, high-isolation broadband orthogonal-mode coupler, characterized in that: It includes a frustum-shaped coupling cavity (1), a mode separation cavity (2), a waveguide matching ladder (3), a ring-shaped combining waveguide (4), and a twisted waveguide (5); the bottom of the frustum-shaped coupling cavity is connected to the mode separation cavity (2), and the lower surface of the frustum-shaped coupling cavity is coplanar with the upper surface of the mode separation cavity (2). The four output ports of the mode separation cavity (2) are respectively connected to the waveguide matching ladder, and the other end of the waveguide matching ladder is connected to the ring-shaped combining waveguide (4). The four waveguide matching ladders are divided into two groups, with two waveguide matching ladders on the same straight line. The two ring-connecting waveguides (4) are connected to the same ring-connecting waveguide (4). The ring-connecting waveguide (4) consists of two short waveguides and one long waveguide. The two short waveguides are connected to the waveguide matching ladder respectively. The two short waveguides are connected to each other after rotating 90 degrees. The two ring-connecting waveguides (4) are 90 degrees symmetrical about the center of the frustum coupler. The waveguide synthesis structure of the ring-connecting waveguide (4) is located at about one-third of the long waveguide. There is a waveguide ridge structure here. The other end of the waveguide synthesis structure is connected to the twisted waveguide (5) through the matching transition section.

2. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 1, characterized in that: One end of the frustum-shaped coupling cavity (1) is a common circular waveguide feed port (101), and the other end is connected to the mode separation cavity (2) through a waveguide matching frustum (102).

3. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 1, characterized in that: The mode separation cavity (2) consists of two orthogonal and partially overlapping rectangular waveguide cavities. The center of the overlapping position of the rectangular waveguide cavities is located at one-third of the two rectangular waveguide cavities. The overlapping part of the rectangular waveguide cavities is connected to the frustum-shaped coupling cavity. There is another matching frustum inside the cavity of the connected part. The matching frustum in the mode separation cavity (2) is concentric with the frustum-shaped coupling cavity, and the center of the frustum is located at the center of the overlapping part of the two orthogonal and partially overlapping rectangular waveguide cavities.

4. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 1, characterized in that: The output port of the microwave-synthesized annular combining waveguide (4) is connected to its respective twisted waveguide (5) through a waveguide transition section. The two annular combining waveguides (4) are symmetrical about 90 degrees.

5. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 1, characterized in that: The rectangular waveguide cavity of the two mode separation cavities (2) and the two annular combining waveguides (4) and their matching steps (3) have the same structure and are 90 degrees rotationally symmetrical about the center of the frustum-shaped coupling cavity.

6. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 1, characterized in that: The twisted waveguide (5) is different from the ring combining waveguide (4). The two twisted waveguides (5) are asymmetrical structures. One twisted waveguide (5) first twists away from the waveguide combining point, and then twists away from the waveguide combining point again. The other twisted waveguide (5) first twists away from the waveguide combining point, and then twists towards the waveguide combining point. This forms a twisted waveguide (5) structure with asymmetry at both ends.

7. The high-power, high-isolation broadband orthogonal-mode coupler according to any one of claims 1-6, characterized in that: The diameter of the frustum coupling cavity (1) gradually increases from top to bottom, and there are small matching frustum structures inside, with the two matching frustums being concentric.

8. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 7, characterized in that: The frustum coupling cavity (1), mode separation cavity (2), waveguide matching ladder (3), ring combining waveguide (4) and twisted waveguide (5) are all made of metal.

9. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 8, characterized in that: The ring-shaped combining waveguide (4) has a chamfered structure at both the bending and combining positions, and the twisted waveguide (5) also has a corresponding chamfered structure at the turning point.

10. The high-power, high-isolation broadband orthogonal-mode coupler according to claim 9, characterized in that: The input port above the frustum coupler is a common port, while the output ports of the two matched stepped waveguides connected to the twisted waveguide (5) are orthogonal independent signal ports.

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