A circular waveguide™ 01 With rectangular waveguide TE 10 Mode converter

Abstract

This invention discloses a circular waveguide TM 01 With rectangular waveguide TE 10 The mode converter includes: a circular waveguide transmission port, a circular waveguide transition section, a circular waveguide coupling cavity, a circular waveguide reflecting cavity, a rectangular waveguide reflecting cavity, and a rectangular waveguide transmission port; the circular waveguide transmission port is used to convert TM... 01 Mode microwave introduction; a circular waveguide transition section is used to achieve a smooth transition between different diameters of the circular waveguide and to suppress the generation of higher-order modes during mode conversion; the circular waveguide coupling cavity is used for circular waveguide TM. 01 Modes and rectangular waveguide TE 10 The mode is converted and coupled to the rectangular waveguide transmission port; the circular waveguide reflecting cavity and the rectangular waveguide reflecting cavity work together inside the converter to adjust the port reflection. This invention has the advantages of high power capacity, high conversion efficiency, and low transmission loss, and can also achieve 90° adjustment of the transmission direction. It has high applicability to high-power microwave transmission systems and has good prospects for engineering applications.

Description

Technical Field

[0001] This invention relates to the field of high-power microwave transmission technology, specifically to a circular waveguide™ 01 With rectangular waveguide TE 10 Mode converter. Background Technology

[0002] With the continuous development of high-power microwave technology, higher requirements are being placed on the power capacity, transmission efficiency, and mode purity of microwave transmission systems. Waveguide mode converters, as key components in microwave transmission systems, can connect different waveguide transmission structures to achieve specific electromagnetic wave mode conversions. Their performance directly determines the operational stability and transmission efficiency of the entire microwave transmission system.

[0003] Among the many microwave transmission modes, the circular waveguide TM... 01 Modes and rectangular waveguides TE 10 These are two widely used modes. Circular waveguide™ 01 The mode exhibits an axisymmetric electric field distribution, and the tube wall current is longitudinal with no periodic component distribution. This characteristic makes it highly suitable for excitation of RF structures in microwave generating devices and for certain specific rotary joint designs. Meanwhile, the rectangular waveguide TE... 10 The mode is the most mature and widely used master mode in microwave engineering. Therefore, realizing a high-power, high-efficiency circular waveguide™ 01 Modes and rectangular waveguide TE 10 The ability to switch between modes is a key aspect of building a high-performance, high-power microwave transmission system.

[0004] Existing technology "A circular waveguide™ 01 -Polarization adjustable TE 11 The "Mode Converter" discloses a circular rectangular mode converter that realizes a circular waveguide™ 01 Model to TE 11 Mode switching is possible, and horizontal, vertical, or circular polarization (TE) can be achieved by adjusting the phase of the adjustable phase shifter in the high-power waveguide of the four rectangular waveguides. 11 It can produce modular outputs, but its structure is relatively complex and difficult to manufacture.

[0005] Existing technology "A rectangular waveguide TE operating in the C-band" 10 -Circular Waveguide™ 01 The "Mode Converter and Conversion Method" discloses another form of circular rectangular mode converter, which connects a rectangular waveguide structure and a rectangular slot structure to achieve electromagnetic wave mode conversion. It has the advantages of high-efficiency energy transmission, low reflection and low loss, but its structure still has room for simplified design.

[0006] The existing technology, "a waveguide square-to-circle conversion component", achieves the transition between a circular waveguide and a standard rectangular waveguide through multiple tapered cavities with arcs. This structure is simple and easy to manufacture, but it cannot achieve spatial adjustment of the transmission direction.

[0007] While existing circular waveguide mode converters meet the requirements of conventional applications to a certain extent, they still face numerous technical bottlenecks when encountering design challenges such as high power, low loss, and structural simplification. Regarding power capacity, traditional mode converters often fail to consider high-power applications, resulting in electric field concentration in the coupling region. In high-power environments, these electric field concentration points can easily become breakdown sources, limiting the overall power capacity of the device. Furthermore, regarding mode purity and heterogeneous mode suppression, circular waveguides… 01 Mode-oriented rectangular waveguide TE 10 Mode conversion easily excites higher-order modes and other parasitic modes. The inability to effectively suppress these unwanted modes can affect the normal operation of subsequent systems. Existing mode purification structures often increase design complexity and fabrication difficulty. Regarding transmission conversion efficiency, many types of mode converters rely on complex gradient structures to achieve impedance matching and mode conversion. Complex transmission paths lead to insertion loss, making it difficult to meet the requirements of high-efficiency transmission (typically not exceeding 95%). In terms of structural layout, many circular rectangular mode converters are unidirectional linear structures, unable to accommodate spatial orientation during microwave transmission. Furthermore, some high-performance mode converters employ complex irregular waveguides or three-dimensional twisted structures, which impose stringent requirements on machining and assembly processes, increasing manufacturing difficulty.

[0008] In summary, a high-power circular waveguide™ with a compact structure, high power capacity, high conversion efficiency, high mode purity, and easy fabrication was designed. 01 - Rectangular waveguide TE 10 The circular-rectangular mode converter is a technical problem that urgently needs to be solved in the field of high-power microwave transmission. Summary of the Invention

[0009] The technical problem to be solved by this invention is that it addresses the limitations of existing circular waveguides (TM). 01 Modes and rectangular waveguides TE 10 To address the shortcomings of inter-mode transmission conversion devices, such as structural complexity, low conversion efficiency, and limited power capacity, a circular waveguide™ with a simple and compact structure, high power capacity, high conversion efficiency, spatial steering capability, and flexible system integration is proposed. 01 With rectangular waveguide TE 10 Mode converter.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A circular waveguide™ 01 With rectangular waveguide TE 10A mode converter includes: a circular waveguide transmission port, a circular waveguide transition section, a circular waveguide coupling cavity, a circular waveguide reflection cavity, a rectangular waveguide reflection cavity, and a rectangular waveguide transmission port; the circular waveguide transmission port, the circular waveguide transition section, the circular waveguide coupling cavity, and the circular waveguide reflection cavity are arranged sequentially, and the rectangular waveguide reflection cavity and the rectangular waveguide transmission port are symmetrically arranged on both sides of the circular waveguide coupling cavity and close to the circular waveguide reflection cavity; the circular waveguide transmission port is used to implement the circular waveguide™ 01 The circular waveguide transition section is used to achieve a smooth transition between different diameters of the circular waveguide and to suppress the generation of higher-order modes during mode switching. The circular waveguide coupling cavity is used for circular waveguide TM. 01 Modes and rectangular waveguide TE 10 The mode is converted and coupled to the rectangular waveguide transmission port. The circular waveguide reflecting cavity and the rectangular waveguide reflecting cavity work together inside the converter to adjust the port reflection.

[0011] As a further improvement of the present invention, a frustum is provided inside the circular waveguide reflecting cavity. The frustum faces the circular waveguide transmission port and extends into the circular waveguide coupling cavity to adjust impedance matching and realize the circular waveguide™. 01 Mode-oriented rectangular waveguide TE 10 Mode transition.

[0012] As a further improvement of the present invention, the top edge of the frustum is chamfered.

[0013] As a further improvement of the present invention, the rectangular waveguide transmission port and the rectangular waveguide reflection cavity are symmetrically distributed on the upper and lower sides of the radial direction of the circular waveguide coupling cavity; wherein, the rectangular waveguide reflection cavity is used to form an equivalent short-circuit reflection surface and adjust the port reflection, and works with the circular waveguide coupling cavity to achieve mode conversion; the rectangular waveguide transmission port is used to realize rectangular waveguide TE 10 The microwave transmission mode simultaneously achieves a 90° deflection of the microwave transmission direction.

[0014] As a further improvement of the present invention, the height of the rectangular waveguide reflecting cavity is 1 / 4 to 1 / 2 of the waveguide wavelength.

[0015] As a further improvement of the present invention, both the rectangular waveguide reflecting cavity and the rectangular waveguide transmission port are tangentially connected to the axis of the circular waveguide coupling cavity.

[0016] As a further improvement of the present invention, a chamfer is provided at the connection between the rectangular waveguide reflecting cavity and the circular waveguide coupling cavity.

[0017] As a further improvement of the present invention, a chamfer is provided at the connection between the rectangular waveguide transmission port and the circular waveguide coupling cavity.

[0018] As a further improvement of the present invention, both the circular waveguide transmission port and the rectangular waveguide transmission port are provided with waveguide flanges at their ends to enable external connection.

[0019] As a further improvement of the present invention, the end face of the waveguide flange is provided with a sealing ring groove and a positioning step.

[0020] Compared with the prior art, the advantages of the present invention are as follows: The circular waveguide TM of the present invention 01 With rectangular waveguide TE 10 This mode converter, compared to existing conversion structures, achieves higher conversion efficiency and lower transmission loss while maintaining power capacity. Its structure is simpler and more compact, making it easier to assemble and integrate. It can flexibly realize transmission conversion between circular and rectangular waveguides in high-power microwave transmission systems, enabling the conversion of TM signals transmitted via circular waveguides. 01 Mode-oriented rectangular waveguide TE 10 This invention enables mode conversion and reverse transmission, and allows for a 90° deflection of the microwave transmission direction during conversion. It also facilitates applications where rectangular waveguides can be connected to other circular waveguide devices (such as rotary joints). In the provided application examples, the return loss of the circular and rectangular waveguide ports of the circular-rectangular mode converter is better than 19 dB in the operating frequency band of 4.1–4.2 GHz, and the transmission efficiency between ports in the operating frequency band is no less than 96.5%. Based on a vacuum breakdown field strength of 50 MV / m, the power capacity of the circular-rectangular mode converter can reach 1.67 GW. These achieved technical specifications make the high-power circular-rectangular mode converter proposed in this invention a promising candidate for high-power microwave transmission. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the circular-rectangular mode converter in specific embodiment 1 of the present invention; Figure 2 This is a schematic cross-sectional view of the circular-rectangular mode converter in specific embodiment 1 of the present invention; Figure 3 This is a top view of the circular-rectangular mode converter in specific embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the circular-rectangular mode converter as seen from the circular waveguide port in specific embodiment 1 of the present invention; Figure 5 The circular waveguide port TM of the circular-rectangular mode converter in specific embodiment 1 of the present invention 01 S of the pattern 11 Reflection coefficient versus frequency curve; Figure 6 The rectangular waveguide port TE of the circular-rectangular mode converter in specific embodiment 1 of the present invention 10 S of the pattern22 Reflection coefficient versus frequency curve; Figure 7 The circular waveguide port TM of the circular-rectangular mode converter in specific embodiment 1 of the present invention 01 Mode-oriented rectangular waveguide port TE 10 S of the pattern 21 Transmission coefficient versus frequency curve; Figure 8 The figure shows the simulation results of the internal field distribution of the circular-rectangular mode converter in specific embodiment 1 of the present invention at an input of 0.5W. Figure 9 This is a three-dimensional structural diagram of the circular-rectangular mode converter in specific embodiment 2 of the present invention; Figure 10 This is a schematic cross-sectional view of the circular-rectangular mode converter in specific embodiment 2 of the present invention; Figure 11 The circular waveguide port TM of the circular-rectangular mode converter in specific embodiment 2 of the present invention 01 S of the pattern 11 Reflection coefficient versus frequency curve; Figure 12 The rectangular waveguide port TE of the circular-rectangular mode converter in specific embodiment 2 of the present invention 10 S of the pattern 22 Reflection coefficient versus frequency curve; Figure 13 The circular waveguide port TM of the circular-rectangular mode converter in specific embodiment 2 of the present invention 01 Mode-oriented rectangular waveguide port TE 10 S of the pattern 21 Transmission coefficient versus frequency curve; Figure 14 The figure shows the simulation results of the internal field distribution of the circular-rectangular mode converter in specific embodiment 2 of the present invention with an input of 0.5W.

[0022] Legend: 1. Circular waveguide transmission port; 2. Circular waveguide transition section; 3. Circular waveguide coupling cavity; 4. Circular waveguide reflection cavity; 41. Frustum; 5. Rectangular waveguide reflection cavity; 51. Reflection cavity chamfer; 6. Rectangular waveguide transmission port; 61. Transmission port chamfer; 7. Waveguide flange. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and specific preferred embodiments, but this does not limit the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0026] It should be noted that TE is the abbreviation for transverse electric wave, and TM is the abbreviation for transverse magnetic wave. A TE wave has zero electric field along the transmission line axis, and a TM wave has zero magnetic field along the transmission line axis. Their suffixes are mn, such as TE... mn In this context, m and n refer to the nth root of the m-th order Bessel function that equals zero in solving the transmission wave equation.

[0027] Example 1 like Figures 1 to 4 As shown, the circular waveguide TM of the present invention 01 With rectangular waveguide TE 10 The mode converter employs an all-metal structure, achieving a circular waveguide™ through the coordinated use of a reflecting cavity and a coupling cavity while ensuring power capacity. 01 With rectangular waveguide TE 10 Efficient mode conversion and transmission direction adjustment. The mode converter in this embodiment includes: a circular waveguide transmission port 1, a circular waveguide transition section 2, a circular waveguide coupling cavity 3, a circular waveguide reflection cavity 4, a rectangular waveguide reflection cavity 5, and a rectangular waveguide transmission port 6. The circular waveguide transmission port 1, circular waveguide transition section 2, circular waveguide coupling cavity 3, and circular waveguide reflection cavity 4 are arranged sequentially. The circular waveguide transition section 2 achieves a smooth transition between the circular waveguide transmission port 1 and the circular waveguide coupling cavity 3, avoiding the generation of higher-order modes during mode conversion and thus preventing impact on transmission efficiency. The rectangular waveguide reflection cavity 5 and the rectangular waveguide transmission port 6 are symmetrically arranged on both sides of the circular waveguide coupling cavity 3 and close to the circular waveguide reflection cavity 4. In this embodiment, the circular waveguide transmission port 1 is used to implement the circular waveguide™... 01For microwave transmission of modes, the circular waveguide transition section 2 is used to achieve a smooth transition between different diameters of the circular waveguide and to suppress the generation of higher-order modes during mode switching. The circular waveguide coupling cavity 3 is used for circular waveguide TM. 01 Modes and rectangular waveguide TE 10 The mode is converted and coupled to the rectangular waveguide transmission port 6. The circular waveguide reflecting cavity 4 and the rectangular waveguide reflecting cavity 5 work together inside the converter to adjust the port reflection. That is, after the microwave enters the circular waveguide coupling cavity 3, the circular waveguide™ is realized through the synergistic effect of the circular waveguide reflecting cavity 4 and the rectangular waveguide reflecting cavity 5 with the circular waveguide coupling cavity 3. 01 Modes and rectangular waveguides TE 10 Efficient conversion between modes, and the converted microwave coupled transmission to rectangular waveguide transmission port 6.

[0028] like Figure 2 As shown, a frustum 41 of a certain depth is provided inside the circular waveguide reflecting cavity 4. The frustum 41 faces the circular waveguide transmission port 1 and extends into the circular waveguide coupling cavity 3 to adjust impedance matching and realize the circular waveguide™. 01 Mode-oriented rectangular waveguide TE 10 Mode transition.

[0029] Furthermore, the top edge of the frustum 41 is chamfered to avoid field concentration, reduce local electric field intensity, prevent breakdown, and improve power capacity. In this embodiment, the outer wall of the circular waveguide reflector cavity 4 is also hollowed out to reduce weight, thereby reducing the weight of the mode converter.

[0030] like Figure 1 and Figure 2 As shown, the rectangular waveguide transmission port 6 and the rectangular waveguide reflecting cavity 5 are symmetrically distributed on the upper and lower radial sides of the circular waveguide coupling cavity 3. The height of the rectangular waveguide reflecting cavity 5 is 1 / 4 to 1 / 2 of the waveguide wavelength, used to form an equivalent short-circuit reflecting surface and adjust port reflection. Together with the circular waveguide coupling cavity 3, it achieves efficient mode conversion. By adjusting the impedance matching state, energy conversion efficiency is maximized, achieving high conversion efficiency and low transmission loss while ensuring power capacity. The rectangular waveguide transmission port 6 is used to realize the rectangular waveguide TE... 10 The microwave transmission mode simultaneously achieves a 90° deflection of the microwave transmission direction.

[0031] Furthermore, both the rectangular waveguide reflecting cavity 5 and the rectangular waveguide transmission port 6 are tangentially connected to the axis of the circular waveguide coupling cavity 3. A chamfer 51 is provided at the connection between the rectangular waveguide reflecting cavity 5 and the circular waveguide coupling cavity 3, and a chamfer 61 is provided at the connection between the rectangular waveguide transmission port 6 and the circular waveguide coupling cavity 3. The radii of both the chamfer 51 and the chamfer 61 can be set to 15mm, which facilitates manufacturing while also preventing field concentration, reducing the risk of breakdown, and improving the overall power capacity of the device.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, both the circular waveguide transmission port 1 and the rectangular waveguide transmission port 6 are provided with waveguide flanges 7 at their ends to enable external connections.

[0033] Furthermore, the waveguide flange 7 is made of standard waveguide flange dimensions, which facilitates system integration. The end face of the waveguide flange 7 has a sealing ring groove and a positioning step to ensure the sealing and stability of the connection with other waveguide transmission components. It also keeps the cavity inside sealed. By evacuating or filling with inert gases such as SF6, the field breakdown threshold can be increased, thereby improving the power capacity of the device.

[0034] Preferably, such as Figure 3 As shown, the diameter of the circular waveguide transmission port 1, D1, is 80 mm. This size can be flexibly adjusted according to the size of the external circular waveguide interface. The length L of the circular waveguide transition section 2 is 150 mm, and the diameter D2 of the circular waveguide coupling cavity 3 after the transition is 69 mm. This size ensures the waveguide power capacity while suppressing the generation of higher-order modes in the circular waveguide. In addition, the rectangular waveguide reflecting cavity 5 and the rectangular waveguide transmission port 6 are both BJ40 rectangular waveguide standard sizes, with a length a equal to 58.2 mm and a width b equal to 29.1 mm.

[0035] Preferably, such as Figure 4 As shown, inside the circular waveguide reflecting cavity 4, the top circular radius R1 of the frustum 41 is 9 mm, the top chamfer is 15 mm, and the chamfer edge radius R2 is 13.35 mm. The bottom circular radius R3 of the frustum 41 is approximately three times the top circular radius, and is set to 25.55 mm after frequency optimization. Furthermore, the radial length H from the inner wall of the circular waveguide coupling cavity 3 to the reflecting surface of the rectangular waveguide reflecting cavity 5 is approximately 1 / 4 to 1 / 2 of the waveguide wavelength, and is set to 30.9 mm after optimization.

[0036] like Figure 5 As shown, the circular-rectangular mode converter in this embodiment operates in the 4.1–4.2 GHz frequency band, and its circular waveguide port TM... 01 The mode return loss is better than 20dB, and the center frequency return loss is 24.8dB.

[0037] like Figure 6 As shown, the circular-rectangular mode converter in this embodiment operates in the 4.1–4.2 GHz frequency band, with its rectangular waveguide port TE... 10 The mode return loss is better than 19dB, and the center frequency return loss is 24.1dB.

[0038] like Figure 7 As shown, the circular-rectangular mode converter in this embodiment operates in the 4.1–4.2 GHz frequency band, and its TM… 01 Mode - TE 10 The transmission loss of this mode is better than 0.15dB, and the corresponding transmission efficiency is no less than 96.5%, which shows good transmission performance.

[0039] like Figure 8 As shown, the maximum internal electric field strength of the circular-rectangular converter in this embodiment is 1108V / m when the input power is 0.5W, and the power capacity calculated using the vacuum metal breakdown threshold of 50MV / m is approximately 1GW.

[0040] The mode converter in this embodiment is a reciprocal device, allowing for mutual conversion between two modes while simultaneously achieving a 90° deflection of the microwave transmission direction. A smooth transition section is added between the circular and rectangular waveguides to reduce the diameter, suppressing the generation of higher-order modes during mode conversion and ensuring the transmission of the dominant mode. A frustum-shaped structure is incorporated at the bottom of the circular waveguide as a reflective cavity to adjust impedance matching and simultaneously achieve TM (transmission mode). 01 Model to TE 10 Mode transition. Two rectangular cavities are located symmetrically on the circular waveguide, with the upper rectangular cavity used to implement TM. 01 In this circular-rectangular mode converter for microwave transmission, the lower rectangular cavity acts as an equivalent short-circuit surface to adjust port reflections, improve conversion efficiency, and reduce transmission loss. Chamfers are provided at the top of the frustum and at the connection between the rectangular cavity and the circular waveguide to avoid field concentration and improve power capacity. This invention offers advantages such as high power capacity, high conversion efficiency, and low transmission loss. It also allows for transmission direction adjustment, has a simple structure, is easy to assemble, and is highly applicable to high-power microwave transmission systems, showing promising prospects for engineering applications. Furthermore, it effectively solves the problem of the lack of high-power-capacity, high-conversion-efficiency, and easily manufactured circular-rectangular mode converters in existing high-power microwave transmission systems.

[0041] Example 2 In practical applications, to ensure good transmission performance while achieving the most compact space possible, such as Figures 9 to 14 As shown, this embodiment uses the circular waveguide TM from Embodiment 1. 01 With rectangular waveguide TE 10 The mode converter has undergone further compact design. For example... Figure 9 and Figure 10The diameters of the circular waveguide transmission port 1 and the circular waveguide coupling cavity 3, as well as the dimensions of the rectangular waveguide reflecting cavity 5 and the rectangular waveguide transmission port 6, remain unchanged. The length L of the circular waveguide transition section 2 is adjusted to 30mm, thereby reducing the longitudinal dimension and overall volume of the device. This meets the system's requirements for miniaturization and high integration, while also reducing processing difficulty and manufacturing costs to some extent. Furthermore, to avoid the excitation of higher-order parasitic modes and impedance mismatch issues caused by the reduced length, the dimensions of the frustum 41 used for matching adjustment inside the circular waveguide reflecting cavity 4 and the radial length of the reflecting surface of the rectangular waveguide reflecting cavity 5 are optimized using multi-objective parameters to achieve good transmission performance.

[0042] Preferably, in this embodiment, the top radius R1 of the frustum 41 inside the circular waveguide reflecting cavity 4 is set to 10.06 mm, the top chamfer remains at 15 mm, the chamfer edge radius R2 is 22.78 mm, and the bottom radius R3 of the frustum 41 is optimized to 34 mm. Furthermore, the radial length H from the inner wall of the circular waveguide coupling cavity 3 to the reflecting surface of the rectangular waveguide reflecting cavity 5 is adjusted to 34.28 mm.

[0043] like Figure 11 As shown, the circular-rectangular mode converter in this embodiment operates in the 4.1–4.2 GHz frequency band, and its circular waveguide port TM... 01 The mode return loss is better than 20dB, and the center frequency return loss is 30.5dB.

[0044] like Figure 12 As shown, the circular-rectangular mode converter in this embodiment operates in the 4.1–4.2 GHz frequency band, with its rectangular waveguide port TE... 10 The mode return loss is better than 20dB, and the center frequency return loss is 28dB.

[0045] like Figure 13 As shown, the circular-rectangular mode converter in this embodiment operates in the 4.1–4.2 GHz frequency band, and its TM… 01 Mode - TE 10 The transmission loss of this mode is better than 0.08dB, and the corresponding transmission efficiency is no less than 98.1%, which shows good transmission performance.

[0046] like Figure 14 As shown, the maximum internal electric field strength of the circular-rectangular converter in this embodiment is 864V / m when the input power is 0.5W, and the power capacity calculated using the vacuum metal breakdown threshold of 50MV / m is approximately 1.67GW.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A circular waveguide™ 01 With rectangular waveguide TE 10 Mode converter, characterized in that, include: The system comprises a circular waveguide transmission port (1), a circular waveguide transition section (2), a circular waveguide coupling cavity (3), a circular waveguide reflection cavity (4), a rectangular waveguide reflection cavity (5), and a rectangular waveguide transmission port (6). The circular waveguide transmission port (1), circular waveguide transition section (2), circular waveguide coupling cavity (3), and circular waveguide reflection cavity (4) are arranged sequentially. The rectangular waveguide reflection cavity (5) and rectangular waveguide transmission port (6) are symmetrically arranged on both sides of the circular waveguide coupling cavity (3) and close to the circular waveguide reflection cavity (4). The circular waveguide transmission port (1) is used to realize the circular waveguide™. 01 The circular waveguide transition section (2) is used to achieve a smooth transition between different diameters of the circular waveguide and to suppress the generation of higher-order modes during mode conversion. The circular waveguide coupling cavity (3) is used for circular waveguide TM. 01 Modes and rectangular waveguide TE 10 The mode is converted and the coupled transmission is sent to the rectangular waveguide transmission port (6). The circular waveguide reflecting cavity (4) and the rectangular waveguide reflecting cavity (5) work together inside the converter to adjust the port reflection.

2. The circular waveguide TM according to claim 1 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The circular waveguide reflecting cavity (4) has a frustum (41) inside. The frustum (41) faces the circular waveguide transmission port (1) and extends into the circular waveguide coupling cavity (3) to adjust impedance matching and realize the circular waveguide™. 01 Mode-oriented rectangular waveguide TE 10 Mode transition.

3. The circular waveguide TM according to claim 2 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The top edge of the frustum (41) is chamfered.

4. The circular waveguide TM according to claim 1 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The rectangular waveguide transmission port (6) and the rectangular waveguide reflection cavity (5) are symmetrically distributed on the upper and lower sides of the circular waveguide coupling cavity (3) in the radial direction; wherein, the rectangular waveguide reflection cavity (5) is used to form an equivalent short-circuit reflection surface and adjust the port reflection, and works with the circular waveguide coupling cavity (3) to achieve mode conversion; the rectangular waveguide transmission port (6) is used to realize rectangular waveguide TE 10 The microwave transmission mode simultaneously achieves a 90° deflection of the microwave transmission direction.

5. The circular waveguide TM according to claim 4 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The height of the rectangular waveguide reflector cavity (5) is 1 / 4 to 1 / 2 of the waveguide wavelength.

6. The circular waveguide TM according to claim 4 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The rectangular waveguide reflecting cavity (5) and the rectangular waveguide transmission port (6) are both tangentially connected to the axis of the circular waveguide coupling cavity (3).

7. The circular waveguide™ according to claim 6 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The rectangular waveguide reflecting cavity (5) and the circular waveguide coupling cavity (3) are provided with a reflecting cavity chamfer (51).

8. The circular waveguide™ according to claim 6 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The rectangular waveguide transmission port (6) is provided with a transmission port chamfer (61) at the connection between it and the circular waveguide coupling cavity (3).

9. The circular waveguide TM according to any one of claims 1 to 8 01 With rectangular waveguide TE 10 Mode converter, characterized in that, Both the circular waveguide transmission port (1) and the rectangular waveguide transmission port (6) are provided with waveguide flanges (7) at their ends to enable external connection.

10. The circular waveguide TM according to claim 9 01 With rectangular waveguide TE 10 Mode converter, characterized in that, The waveguide flange (7) has a sealing ring groove and a positioning step on its end face.

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