CN111969288A - Oblique multipath synthesis gyrotron traveling wave tube TE02Mode input coupler - Google Patents
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Abstract
The invention discloses a slant entry type multipath synthesis gyrotron traveling wave tube TE02A mode input coupler belongs to the technical field of microwave and millimeter wave devices. The input coupler includes a power splitting section, a ramp-in demultiplexing section, and a cutoff circular waveguide. Coupling high-purity TE in main circular waveguide by adopting inclined-in type multipath synthesis structure02Mode destruction of TE in the circular waveguide by changing the number and position distribution of the branches of the rectangular waveguide on the sidewall of the circular waveguide and the angle between the rectangular waveguide branch and the circular waveguide02Mode's dominant contention mode (TE)01，TE41) The field distribution of the optical waveguide improves impedance matching, thereby achieving the beneficial effects of effectively inhibiting a stray mode, reducing a reflection coefficient, improving conversion efficiency and increasing bandwidth.
Description
Technical Field
The invention belongs to the technical field of microwave and millimeter wave devices, and particularly relates to an obliquely-entering multi-path synthesized gyrotron traveling wave tube TE02A mode input coupler.
Background
The gyrotron traveling wave tube is a high-power wide-band microwave and millimeter wave amplifierThe amplifier has the characteristics of high power and wide frequency band, and has wide application prospect in the fields of millimeter wave imaging radar, millimeter wave communication systems, electronic warfare and the like. The input coupler is one of the core components of the gyrotron traveling wave tube, and the main function of the input coupler is to connect TE of a standard rectangular waveguide10Mode TE for coupling out rotary traveling wave tube from circular waveguide through specific mode conversionmnAnd (5) molding. It is a core high-frequency device which completes the mode conversion of input signals and modulates the energy or the speed of the cyclotron electron beam. Therefore, in order to ensure good working performance of the gyrotron traveling wave tube, the input coupler is required to have the characteristics of capability of effectively suppressing the stray mode, low reflection coefficient, high conversion efficiency, wide bandwidth and the like.
The input coupler of the gyrotron traveling wave tube is a three-port device, and two output ports are both circular waveguides and are respectively connected with the electron gun and the beam-wave interaction region, so that a structure excited by the side wall of the circular waveguide is usually adopted to excite a working mode required by the gyrotron traveling wave tube. The structure of the input coupler of the common gyrotron traveling wave tube includes three types: the first type is a direct feed-in type input coupler, which has a simple structure, but cannot ensure a working mode with high output purity, and has low conversion efficiency. The second type, coaxial input coupler, has the advantages of high conversion efficiency and mode purity, but has the problems of limited bandwidth, high sensitivity to parameters, etc. due to the resonant cavity structure. The third type, the sidewall input coupler based on the Y-type power divider, is the input coupler of the type passing TE inputted by a rectangular waveguide10The mode is vertically fed into the output circular waveguide from the side wall of the circular waveguide, so as to excite the required working mode of the gyrotron traveling wave tube, and the mode is characterized in that: the broadband is wide, the conversion efficiency is high, the bandwidth can be expanded by reasonably increasing branches, the mixed mode is inhibited, but for the high-order mode of exciting the circular waveguide, a large number of competitive modes exist, and the broadband input with high mode purity is difficult to realize.
In the research work on gyrotron traveling wave tube input coupler, TE01Mold, TE13Mold, TE11The design of the mode input coupler is common, and researchers at home and abroad put forward a plurality of improved schemes on the basis of the traditional structureSuch as: adding a Bragg reflector at one end of the circular waveguide; special materials are used outside the circular waveguide to absorb the stray mode, and a reflection matching section is added at the rectangular waveguide. However, with the expansion of the application field and the urgent need for high power, the TE is a circular waveguide02Mode 2 subharmonic operating gyrotubes have also been developed, however TE02The related design work of the mode input coupler is rarely reported at home and abroad. TE02The design difficulty of the mode input coupler is TE02The mode is a high-order mode, a plurality of competitive modes exist, so that the suppression of the mixed mode is difficult, the conversion efficiency is low, the available frequency bandwidth is limited, and the high-purity broadband TE is difficult to obtain by adopting the traditional design method for design02And (5) molding.
Disclosure of Invention
To solve the problem of gyrotron traveling wave tube TE02The mode input coupler has the problems of difficult stray mode suppression, low conversion efficiency and narrow relative bandwidth. The invention provides an oblique-entering type multipath synthesis gyrotron traveling wave tube TE02A mode input coupler. The input coupler adopts an inclined-in type multi-path synthesis structure to couple out high-purity TE in a circular waveguide02And (5) molding. The TE in the main circular waveguide is destroyed by changing the branch number and position distribution of the rectangular waveguide on the side wall of the main circular waveguide and the included angle between the rectangular waveguide branch of the side wall and the circular waveguide02Mode's dominant contention mode (TE)01，TE41) The field distribution of the optical waveguide improves impedance matching, thereby achieving good design effects of effectively inhibiting a stray mode, reducing a reflection coefficient, improving conversion efficiency and increasing bandwidth.
The technical scheme adopted by the invention is as follows:
inclined-in multi-path synthesized gyrotron traveling wave tube TE02A mode input coupler includes a power splitting section, a ramp-in multiplexing section, and a cutoff circular waveguide.
The power distribution part is a standard rectangular waveguide TE at the input end10The mode microwave signal is equally divided into eight paths of constant-amplitude microwave signals which are uniformly distributed along the radial direction. Specifically, the power distribution part comprises a standard rectangular waveguide, a T-shaped power divider A, two transition waveguides A, two T-shaped power dividers B and four transitionsWaveguide B, four Y-shaped power splitters and eight transition waveguides C. TE10The mode microwave signal is input into a standard rectangular waveguide and is divided into two paths of half microwave signals with equal amplitude through a T-shaped power divider A; each path of half microwave signal is input into a T-shaped power divider B through a section of transition waveguide A and is equally divided into two paths of quarter microwave signals with equal amplitude; each path of quarter microwave signal is input into the Y-shaped power divider through a section of transition waveguide B and is equally divided into two paths of eighth microwave signals with equal amplitude; and one eighth microwave signal of the eight paths passes through a section of transition waveguide C respectively, and finally the radial uniform distribution of the output eight paths of constant amplitude microwave signals is realized.
Furthermore, the power distribution part is located on the same horizontal plane, the size of the T-shaped power divider A is the same as that of the T-shaped power divider B, and the size of the four Y-shaped power dividers is also the same.
Furthermore, a step-shaped matching section A is arranged at the joint of the standard rectangular waveguide A and the T-shaped power divider A, a step-shaped matching section B is arranged at the joint of the transition waveguide A and the T-shaped power divider B, and a step-shaped matching section C is arranged between the transition waveguide B and the Y-shaped power divider. The stepped matching section enables the power distribution part to be compact in structure, and low-loss impedance matching among waveguides of different sizes is achieved.
Further, the T-shaped power divider A, T-shaped power divider B is provided with matching grooves for reducing the reflection coefficient of the T-shaped power divider.
The inclined type multi-path synthesis part is composed of eight inclined type rectangular waveguides and a main circular waveguide. Eight paths of constant-amplitude microwave signals output by the power distribution part are respectively input into one path of inclined rectangular waveguide, then are respectively injected into the main circular waveguide through one coupling hole, and finally are synthesized into TE in the main circular waveguide02And (5) molding. The radius of the main circular waveguide is the same as that of a high-frequency system of the gyrotron traveling wave tube beam-wave interaction. The eight paths of inclined rectangular waveguides are angularly and uniformly distributed on the outer side of the main circular waveguide, and the included angle between the inclined rectangular waveguide and the main circular waveguide is theta5And theta5Not equal to 90 degrees, the transition waveguide C is perpendicular to the central axis of the main circular waveguide and forms an included angle theta with the obliquely-entering rectangle4Satisfies theta4+θ5180 DEG, simultaneously, transitionAn upper chamfer and a lower chamfer are arranged at the joint of the waveguide C and the oblique-in rectangular waveguide.
The number of branches of the obliquely-entering rectangular waveguide and the distribution position of the branches are obtained according to coupled wave theory analysis. According to the coupled wave theory, the arrangement of the oblique-in rectangular waveguide needs to ensure that the electric field distribution of the competition mode is destroyed and simultaneously the TE and the E are excited in the main circular waveguide02The modes have electric field distributions of the same phase and direction. Therefore, in order to obtain a high purity TE02The coupling hole must be located at the position of TE41The mould has the position of opposite electric field vector or phase, further confirms that the oblique rectangular waveguide is eight oblique rectangular waveguides with the same size, and the position distribution condition is angular uniform distribution. The inclined multi-path structure is beneficial to inhibiting the mixed mode and coupling out the TE required by the inclined multi-path structure in the main circular waveguide02The modes have electric fields of the same phase and direction.
Further, an included angle theta between the inclined rectangular waveguide and the main circular waveguide5Determined according to microwave propagation theory. Specifically, a vertex of a coupling hole close to the cut-off circular waveguide is defined as 1 point, a vertex of a coupling hole adjacent to the 1 point and far from the cut-off circular waveguide is defined as 2 points, a point on a narrow side of the obliquely-entering rectangular waveguide is defined as 3 points, and the three points form a right triangle10Die and TE02Coupling strength between the modes, and thus, improving mode conversion efficiency, TE needs to be ensured02Phase transition and TE when the mode propagates from 1 point to 2 points in FIG. 210The phase transformation of the mode from 3 points to 2 points is consistent, and phase matching is realized.
Further, determining theta of an included angle between the oblique-in rectangular waveguide and the main circular waveguide according to the formulas (1) and (2)5。
β10L12＝β02L23 (1)
Wherein, beta10Is TE10Phase constant of mode, beta02Is TE02Phase constant of the mode, L12Is the distance between point 1 and point 2, L23Is the distance between point 2 and point 3, θ5Is the angle between the oblique rectangular waveguide and the main circular waveguide.
And the cut-off circular waveguide is connected with the lower port of the main circular waveguide in the inclined multipath synthesis part. The extremely serious electron interception can be caused when the radius of the cut-off waveguide is too small, a good cut-off effect cannot be achieved when the radius of the cut-off circular waveguide is too large, the optimal radius of the cut-off circular waveguide is 0.7-0.8 times of the radius of the circular waveguide, and the TE is reduced02Energy loss due to mode reversal.
Compared with the traditional structure, the innovation of the invention is that the high-order TE is synthesized in the main circular waveguide by adopting the multi-path oblique-entering rectangular waveguide02The mode has the advantages that the phase matching and the stray mode suppression of the microwave signal at the coupling hole are realized by adjusting the number of the inclined rectangular waveguide branches and the included angle between the inclined rectangular waveguide and the main circular waveguide, so that the TE of the gyrotron traveling wave tube is realized02The mode input coupler realizes good design effects of high mode purity, low reflection coefficient and relatively wide bandwidth.
The invention has the beneficial effects that:
(1) the invention designs an oblique-entering type multipath synthesis gyrotron traveling wave tube TE02The mode input coupler is a high-order mode, high-frequency, broadband input coupler, and the relative bandwidth of-0.5 dB is: 9.1% (208-; -1dB relative bandwidth up to 11% (206-230 GHz); the reflection coefficient is lower than-15 dB.
(2) The adoption of the inclined multipath structure: (a) effective suppression of the primary competition mode TE41And TE01(ii) a (b) Enhancing TE in rectangular waveguides10TE in mode and circular waveguides02Impedance matching of the mode at the coupling aperture, reducing reflection; (c) TE coupled out of circular waveguide02The mold has good directionality.
(3) The invention designs an oblique-entering type multipath synthesis gyrotron traveling wave tube TE02The power distribution parts in the mode input coupler structure are integrally positioned on the same horizontal plane, and the number of the power distribution parts is threeThe T-shaped power divider is the same in size, the four Y-shaped power dividers are the same in size, the eight inclined rectangular waveguides are the same in size, and the inclined rectangular waveguides have symmetrical structures and are convenient to process.
Drawings
FIG. 1 shows an oblique multi-path synthesized gyrotron TE wave tube of the present invention02A mode input coupler schematic;
FIG. 2 is a schematic diagram of a tilt-in type multi-path synthesized gyrotron TE wave tube02Mode input coupler-partial structure schematic;
FIG. 3 is a schematic diagram of a tilt-in type multi-channel synthesized gyrotron TE of the present invention02A mode input coupler side view;
FIG. 4 is a schematic diagram of a tilt-in type multi-path synthesized gyrotron TE of the present invention02TE of mode input coupler02Mold and main miscellaneous mold TE01、TE41A transmission coefficient;
FIG. 5 shows an oblique multi-path synthesized gyrotron TE of the present invention02The reflection coefficient of the mode input coupler.
Detailed Description
The invention is explained in more detail below with reference to a design example and the attached drawing:
the working band of the embodiment is as follows: 205-.
FIG. 1 is a schematic diagram of a tilt-in type multi-path synthesized gyrotron traveling wave tube TE02A mode input coupler schematic; FIG. 2 is a schematic diagram of a tilt-in type multi-channel synthesized gyrotron traveling wave tube TE02Mode input coupler-partial structure schematic; FIG. 3 is a schematic diagram of a tilt-in type multi-channel synthesized gyrotron traveling wave tube TE02Mode input coupler side view. The embodiment comprises the following steps: the power distribution part: the waveguide grating comprises a standard rectangular waveguide A (1), a step-type matching section A (2), a matching groove (3), a T-type power divider A (4), a transition waveguide A (5), a T-type power divider B (6), a transition waveguide B (7), a step-type matching section B (8) and a Y-type power divider (9). Slant entry multiplex synthesis part: the waveguide structure comprises a transition waveguide C (10), an inclined rectangular waveguide (11) and a main circular waveguide (12); a cut waveguide portion: a cut-off circular waveguide (13).
1. Power distribution section
The standard rectangular waveguide a (1) is a standard rectangular waveguide (BJ 2200): the broadside dimension is 1.092mm, and the narrow side dimension is 0.546 mm.
Step-shaped matching section a (2): the width dimension is 1.14mm, the narrow edge dimension is 0.78mm, and the length is 0.39 mm; the front end matching sections of the T-shaped power divider A (4) and the two T-shaped power dividers B (6) are step-shaped matching sections A (2).
Matching groove (3): the width dimension is 1.27mm, the narrow edge dimension is 0.61mm, and the depth is 0.26 mm.
T-type power divider a (4): input port size: the size of the wide edge is 1.27mm, and the size of the narrow edge is 1 mm; the sizes of the two arms are as follows: the width dimension is 1.27mm, and the narrow edge dimension is 0.7 mm; the two T-shaped power dividers B (6) and A (4) are equal in size.
Transition waveguide a (5): the turning of 90 degrees is realized, the size of the wide edge is 1.27mm, and the size of the narrow edge is 0.7 mm.
Transition waveguide B (7): the turning of 135 degrees is realized, the size of the wide edge is 1.27mm, and the size of the narrow edge is 0.7 mm.
Step-shaped matching section B (8): the width dimension is 1.19mm, the narrow edge dimension is 0.81mm, and the length is 0.36 mm.
Y-type power divider (9): input port size: the width dimension is 1.27mm, and the narrow edge dimension is 1.2 mm; the sizes of the two arms are as follows: the width dimension is 1.27mm, and the narrow edge dimension is 0.635 mm.
Transition waveguide C (10): eight paths of microwave signals are output inwards in the radial direction, the size of the wide edge is 1.27mm, and the size of the narrow edge is 0.635 mm.
2. Inclined-in type multiplex synthesis part
Angled rectangular waveguide (11): the width dimension is 1.27mm, the narrow edge dimension is 0.635mm, and the length is 5 mm.
T is 1.45mm away from the lower end of the main circular waveguide.
Output port (12): the radius of the main circular waveguide is 1.69mm, and the height is 4 mm.
The width of the upper chamfer is 0.1mm, and the angle is 23.5 degrees; the width of the lower chamfer is 0.98mm, and the angle is 23.5 degrees.
3. Cut-off waveguide section
Cutoff circular waveguide (13): the radius is 1.35mm and the height is 1.5 mm.
In FIGS. 1 and 2, θ1＝90°，θ2＝135°，θ3＝45°，θ4＝133°，θ5＝47°。
FIG. 3 shows that the power distribution portion is located on the same horizontal plane, the circular main waveguide (12) is located at the center, the eight-way slant-in waveguides (11) are symmetrically distributed on the side wall of the circular main waveguide, and an included angle theta is formed between the eight-way slant-in waveguides and the circular main waveguide (11)5The included angle theta between the eight-way inclined-in waveguide (11) and the transition waveguide C (10) is 47 degrees4＝133°，θ4+θ5＝180°。
FIG. 4 is a schematic diagram of a tilt-in type multi-path synthesized gyrotron TE of the present invention02The transmission coefficient of the mode input coupler. The TE of the gyrotron traveling wave tube input coupler can be known from the figure10-TE02The transmission parameters have a wide working bandwidth, wherein the bandwidth coverage range of the transmission parameters is more than-0.5 dB from 206GHz to 230GHz, and the bandwidth coverage range of the transmission parameters is more than-1 dB from 206GHz to 230 GHz. As can be seen, TE at the input end10Mould to other (TE)01\TE41) The transmission parameters of (2) are relatively low, and are all below-15 dB in the frequency range from 206GHz to 230GHz, and the TE is shown10Mode to input TE02Other modes except the mode are well restrained, thereby realizing TE10-TE02The high-efficiency mode conversion of the second waveguide outputs the circular waveguide TE with higher purity02And (5) molding.
FIG. 5 shows an oblique multi-path synthesized gyrotron TE of the present invention02The reflection coefficient of the mode input coupler. The figure shows that the reflection coefficient of the input coupler of the gyrotron traveling wave tube is about-15 dB in the frequency range from 206GHz to 230GHz, and the low-reflection engineering requirement is met.
The above examples are merely for convenience of illustration of the present invention, and the present invention provides a tilt-in type multi-path synthesized gyrotron traveling wave tube TE02The mode input coupler can also be applied to other frequency bands, and the specific size is determined by the corresponding frequency band and the working mode.
Claims (8)
1. Inclined-in multi-path synthesized gyrotron traveling wave tube TE02The mode input coupler is characterized by comprising a power distribution part, an inclined-in type multipath synthesis part and a cut-off circular waveguide;
the power distribution part is a standard rectangular waveguide TE at the input end10The mode microwave signal is equally divided into eight paths of constant-amplitude microwave signals which are uniformly distributed along the radial direction;
the inclined type multi-path synthesis part consists of eight inclined type rectangular waveguides and a main circular waveguide; eight paths of constant-amplitude microwave signals output by the power distribution part are respectively input into one path of inclined rectangular waveguide, then are respectively injected into the main circular waveguide through one coupling hole, and finally are synthesized into TE in the main circular waveguide02Molding; the radius of the main circular waveguide is the same as that of a cyclotron traveling wave tube beam-wave interaction high-frequency system; the eight paths of inclined rectangular waveguides are angularly and uniformly distributed on the outer side of the main circular waveguide, and the included angle between the inclined rectangular waveguide and the main circular waveguide is theta5And theta5Not equal to 90 degrees, the output end of the power distribution part is perpendicular to the central axis of the main circular waveguide and forms an included angle theta with the obliquely-entering rectangle4Satisfies theta4+θ5The cutoff circular waveguide is connected with the lower port of the main circular waveguide at 180 degrees, and the radius of the cutoff circular waveguide is 0.7-0.8 times that of the main circular waveguide.
2. The oblique entry multi-channel synthetic gyrotron TE of claim 102The mode input coupler is characterized in that the included angle theta between the oblique entering type rectangular waveguide and the main circular waveguide5Determining according to a microwave propagation theory;
defining one vertex of a coupling hole close to the cut-off circular waveguide as 1 point, the vertex of the coupling hole adjacent to the 1 point and far from the cut-off circular waveguide as 2 points, the point at the narrow side of the inclined rectangular waveguide as 3 points, and the three points form a right triangle10Die and TE02Coupling strength between the modes, and thus, improving mode conversion efficiency, TE needs to be ensured02Conversion of phase and TE when the mode propagates from 1 point to 2 points10The phase transformation of the mode from 3 points to 2 points is consistent, and phase matching is realized.
3. The oblique entry multi-channel synthetic gyrotron TE of claim 202A modular input coupler, characterized in that it is based on the formula (1) (2)Determining theta of included angle between inclined rectangular waveguide and main circular waveguide5；
β10L12＝β02L23 (1)
Wherein, beta10Is TE10Phase constant of mode, beta02Is TE02Phase constant of the mode, L12Is the distance between point 1 and point 2, L23Is the distance between point 2 and point 3.
4. A tilt-in multi-channel synthetic gyrotron TE tube as claimed in claim 1 or 202The mode input coupler is characterized in that the power distribution part comprises a standard rectangular waveguide, a T-shaped power divider A, two transition waveguides A, two T-shaped power dividers B, four transition waveguides B, four Y-shaped power dividers and eight transition waveguides C; TE10The mode microwave signal is input into a standard rectangular waveguide and is divided into two paths of half microwave signals with equal amplitude through a T-shaped power divider A; each path of half microwave signal is input into a T-shaped power divider B through a section of transition waveguide A and is equally divided into two paths of quarter microwave signals with equal amplitude; each path of quarter microwave signal is input into the Y-shaped power divider through a section of transition waveguide B and is equally divided into two paths of eighth microwave signals with equal amplitude; and one eighth microwave signal of the eight paths passes through a section of transition waveguide C respectively, and finally the radial uniform distribution of the output eight paths of constant amplitude microwave signals is realized.
5. The oblique entry multi-path synthesis gyrotron TE tube of claim 402The mode input coupler is characterized in that the power distribution part is located on the same horizontal plane, the size of the T-shaped power divider A is the same as that of the T-shaped power divider B, and the size of the four Y-shaped power dividers is also the same.
6. The oblique entry multi-path synthesis gyrotron TE tube of claim 402The mode input coupler is characterized in that a step-shaped matching section A is arranged at the joint of the standard rectangular waveguide A and the T-shaped power divider A, a step-shaped matching section B is arranged at the joint of the transition waveguide A and the T-shaped power divider B, and a step-shaped matching section C is arranged between the transition waveguide B and the Y-shaped power divider.
7. The oblique entry multi-path synthesis gyrotron TE tube of claim 402The mode input coupler is characterized in that the T-shaped power divider A, T type power divider B is provided with matching grooves for reducing the reflection coefficient of the T-shaped power divider.
8. The oblique entry multi-path synthesis gyrotron TE tube of claim 402The mode input coupler is characterized in that an upper chamfer and a lower chamfer are arranged at the joint of a transition waveguide C and an oblique rectangular waveguide.
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| CN112615123A (en) * | 2020-12-16 | 2021-04-06 | 电子科技大学 | Angular power division waveguide structure applied to medium-loaded gyrotron traveling wave tube |
| CN113740708A (en) * | 2021-08-27 | 2021-12-03 | 西安交通大学 | Circular waveguide TE11 and TM01 hybrid mode diagnosis method based on eight-hole coupler |
| CN114039184A (en) * | 2021-10-26 | 2022-02-11 | 武汉星伴通信设备有限责任公司 | Multipath radial power synthesis amplifier |
| CN114783849A (en) * | 2022-03-04 | 2022-07-22 | 电子科技大学 | Double-confocal waveguide cyclotron traveling wave tube input coupler based on coaxial resonant cavity structure |
| CN114823255A (en) * | 2022-02-28 | 2022-07-29 | 电子科技大学 | Double-confocal waveguide cyclotron traveling wave tube input coupler based on power distribution network structure |
| CN115458881A (en) * | 2022-09-29 | 2022-12-09 | 电子科技大学 | Compact rectangular waveguide-circular waveguide mode converter |
| CN115458890A (en) * | 2022-08-31 | 2022-12-09 | 电子科技大学 | Ridge loading inclined-entering type multi-path synthesis TE03 mode input coupler |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615123A (en) * | 2020-12-16 | 2021-04-06 | 电子科技大学 | Angular power division waveguide structure applied to medium-loaded gyrotron traveling wave tube |
| CN112615123B (en) * | 2020-12-16 | 2021-12-03 | 电子科技大学 | Angular power division waveguide structure applied to medium-loaded gyrotron traveling wave tube |
| CN113740708A (en) * | 2021-08-27 | 2021-12-03 | 西安交通大学 | Circular waveguide TE11 and TM01 hybrid mode diagnosis method based on eight-hole coupler |
| CN114039184A (en) * | 2021-10-26 | 2022-02-11 | 武汉星伴通信设备有限责任公司 | Multipath radial power synthesis amplifier |
| CN114823255A (en) * | 2022-02-28 | 2022-07-29 | 电子科技大学 | Double-confocal waveguide cyclotron traveling wave tube input coupler based on power distribution network structure |
| CN114783849A (en) * | 2022-03-04 | 2022-07-22 | 电子科技大学 | Double-confocal waveguide cyclotron traveling wave tube input coupler based on coaxial resonant cavity structure |
| CN115458890A (en) * | 2022-08-31 | 2022-12-09 | 电子科技大学 | Ridge loading inclined-entering type multi-path synthesis TE03 mode input coupler |
| CN115458890B (en) * | 2022-08-31 | 2023-08-08 | 电子科技大学 | Ridge loading oblique-in type multipath synthesized TE03 mode input coupler |
| CN115458881A (en) * | 2022-09-29 | 2022-12-09 | 电子科技大学 | Compact rectangular waveguide-circular waveguide mode converter |
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