CN108172962B - Broadband circular waveguide directional coupler for microwave power measurement - Google Patents
Broadband circular waveguide directional coupler for microwave power measurement Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/181—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being hollow waveguides
- H01P5/182—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being hollow waveguides the waveguides being arranged in parallel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/24—Terminating devices
- H01P1/26—Dissipative terminations
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Abstract
The invention discloses a broadband circular waveguide directional coupler for microwave power measurement, and relates to the technical field of microwave and millimeter wave devices. Compared with the traditional over-mode circular waveguide directional coupler, the novel over-mode circular waveguide directional coupler introduces the non-standard rectangular waveguide to replace the standard rectangular waveguide in the traditional over-mode circular waveguide directional coupler. The cut-off wave number of a fundamental mode TE10 mode of the non-standard overmoded rectangular waveguide is changed by adjusting the size of the non-standard overmoded rectangular waveguide, so that the cut-off wave number of the fundamental mode TE10 mode of the non-standard overmoded rectangular waveguide is the same as the cut-off wave number of a working mode TEmn mode in the overmoded circular waveguide, the propagation (phase) constant of the TE10 mode at any frequency point is the same as the propagation constant of the working mode TEmn, and further forward waves of the coupler can meet the same-direction superposition condition at any frequency point, and the purposes of expanding the working bandwidth of the overmoded circular waveguide directional coupler and reducing the in-band coupling degree fluctuation are achieved.
Description
Technical Field
The invention relates to the technical field of microwave and millimeter wave devices, in particular to a circular waveguide structure for transmitting and measuring high-power microwaves and millimeter waves output by high-power microwave and millimeter wave sources such as a gyrotron traveling wave tube, a klystron and the like.
Background
The directional coupler is a microwave millimeter wave device widely applied to the field of microwave and millimeter wave measurement, and has the main functions of accurately sampling high-power signals transmitted in a microwave and millimeter wave system and coupling a small part of microwave and millimeter wave signals so as to carry out time domain envelope monitoring, power measurement, spectrum measurement and the like on the high-power signals transmitted in the system through measuring instruments such as an oscilloscope, a small power meter, a frequency spectrograph and the like.
Most of the traditional high-power microwave systems adopt rectangular waveguides as transmission lines, and the directional couplers matched with the transmission lines generally adopt rectangular waveguide structures. However, with the development of a microwave millimeter wave source-gyrotron with higher output power level, a large number of microwave millimeter wave systems using circular waveguides as transmission lines are beginning to be adopted in engineering applications. In order to sample and measure high power signals transmitted in the microwave and millimeter wave system, a conventional over-mode circular waveguide structure directional coupler is developed. The directional coupler with the over-mode circular waveguide structure generally comprises a main waveguide (over-mode circular waveguide) and an auxiliary waveguide (standard rectangular waveguide), wherein the main waveguide and the auxiliary waveguide are connected through a coupling hole. The working principle is as follows: when injected microwave and millimeter wave signals pass through the main waveguide, most energy flows to the output end of the main waveguide, and a small part of microwave and millimeter wave signals are coupled through the coupling hole and flow to the auxiliary waveguide; and the energy flow in the secondary waveguide is divided into forward wave (same as the transmission direction of the microwave and millimeter wave of the main waveguide) and backward wave (opposite to the transmission direction of the microwave and millimeter wave of the main waveguide). Two important technical indexes of the directional coupler can be calculated by measuring the energy of forward wave and backward wave in the auxiliary waveguide of the directional coupler and the input energy in the main waveguide: coupling and isolation.
However, unlike the rectangular waveguide structure directional coupler: the difference between the phase constants of the microwave and millimeter wave working modes (TEmn mode, where n is not 0) propagated in the main waveguide and the working modes (TE10 mode) propagated in the sub waveguide (rectangular waveguide) in the conventional over-mode circular waveguide structure directional coupler is large, so that the conventional over-mode circular waveguide directional coupler has a narrow working frequency band, is difficult to realize broadband high-directional coupling, and has a long coupler length. In order to realize broadband high-directivity coupling, the secondary waveguide generally adopts a non-standard overmoded rectangular waveguide to improve the working bandwidth and shorten the length of the coupler. However, the non-standard over-mode rectangular waveguide is adopted, the sub-waveguide of the coupler excites a high-order mode (TEmn, wherein m is more than 1), and the high-order modes mainly exist are TE20, TE30 and the like. In order to realize the measurement of the forward coupling degree and the reverse coupling degree of the traditional single-arm directional coupler (only one auxiliary waveguide), a forward non-standard rectangular output port and a reverse non-standard rectangular output port are required to be gradually changed into standard rectangular ports, and then the standard rectangular waveguide port converter is connected for electromagnetic characteristic measurement. However, since the higher-order mode cannot be transmitted in the standard rectangular waveguide, it will be reflected back and forth in the non-standard rectangular sub-waveguide; and the high-order mode (such as TE20) content is high, which affects the transmission of the working mode (TE10 mode) in the secondary waveguide and is easy to cause large measurement error.
Disclosure of Invention
The device and the method aim to overcome the defects that the traditional over-mode circular waveguide directional coupler is narrow in working frequency band (the relative bandwidth is generally less than 10%), large in-band coupling degree fluctuation (the coupling degree fluctuation between frequency points in the working frequency band is greater than 5dB), poor in directivity (isolation degree) (the directivity of the working frequency band is less than 20dB) and the influence of high-order modes in a non-standard auxiliary waveguide on a measurement result. The invention provides a technical scheme of a novel over-mode circular waveguide broadband directional coupler.
The novel over-mode circular waveguide broadband directional coupler adopts a double-arm structure, meanwhile, strip-shaped wave absorbing materials are added into a non-standard auxiliary waveguide, and double-wedge-shaped absorbing loads are added at an output port on one side of the auxiliary waveguide, so that the purpose of the invention is achieved. Therefore, the technical scheme of the invention is a broadband circular waveguide directional coupler for microwave power measurement, which comprises the following components: an over-mode circular waveguide (i.e., a primary waveguide), a two-arm secondary waveguide; the double-arm auxiliary waveguide comprises an upper arm auxiliary waveguide and a lower wall auxiliary waveguide, and the upper arm auxiliary waveguide or the lower wall auxiliary waveguide comprises: the waveguide structure comprises a non-standard rectangular waveguide, two non-standard overmoded rectangular E-bend waveguides and an absorption load; the two non-standard overmoded rectangular E-bend waveguides are respectively arranged at two ends of the non-standard rectangular waveguide and connected with the non-standard rectangular waveguide, and one of the two non-standard overmoded rectangular E-bend waveguides is connected with an absorption load; the nonstandard rectangular waveguide of the upper arm auxiliary waveguide and the nonstandard rectangular waveguide of the lower wall auxiliary waveguide are respectively arranged at two sides (180-degree symmetrical distribution) of the over-mode circular waveguide which are symmetrical about a central axis and are parallel to the microwave transmission direction of the over-mode circular waveguide, and the nonstandard rectangular waveguide is communicated with the over-mode circular waveguide through a coupling circular hole.
Furthermore, the bending angle of the non-standard over-mode E bending moment waveguide is 90 degrees, and the bending radius is not less than 2 times of the length of the narrow side of the non-standard rectangular waveguide. The effect of the non-standard over-mode E bending moment waveguide is to change the propagation direction of energy in the secondary waveguide, so that the connection with an external detection system is facilitated; so that the standing-wave ratio is guaranteed to be less than 1.05 in the whole working frequency band.
Furthermore, the coupling circle between the non-standard rectangular waveguide and the over-mode circular waveguide is two rows of symmetrically distributed round holes, and the arrangement direction of the round holes is consistent with the transmission direction of the microwaves and millimeter waves in the main waveguide; the radius and height of the coupling holes are determined by the coupling degree of the directional coupler, the distance between the coupling holes is determined by the working mode and the working frequency in the over-mode circular waveguide, and the number of the coupling holes is determined by the working bandwidth.
Furthermore, the absorption load is rectangular, the outer part of the absorption load is made of metal materials, the inner part of the absorption load is made of wave-absorbing materials, and the inner part of the absorption load is in a double-wedge shape. The purpose is to increase the wave-absorbing area of the material, reduce the energy reflection of microwave and millimeter wave, and improve the working bandwidth and working stability of the secondary waveguide.
Furthermore, a strip-shaped mode suppression/absorption device is arranged on the inner wall of the waveguide on the side, far away from the over-mode circular waveguide, of the non-standard rectangular waveguide, the installation direction of the strip-shaped mode suppression/absorption device is consistent with the directions of the main waveguide and the auxiliary waveguide, the length of the strip-shaped mode suppression/absorption device is consistent with the length of the auxiliary waveguide, and the thickness of the strip-shaped mode suppression/absorption device is determined by a suppression mode, a suppression degree and the fluctuation of the coupling degree.
The wave-absorbing material is generally solid materials such as silicon carbide, beryllium oxide, graphene and the like, and the metal materials are generally copper, aluminum and the like.
The design principle is as follows:
the spacing between the coupling holes is calculated by utilizing a porous coupling mode and a phase superposition principle, so that forward waves in the auxiliary waveguide meet the same-direction superposition condition, reverse waves meet the reverse offset condition, the working bandwidth and the isolation of the over-mode circular waveguide directional coupler are improved, and the in-band coupling fluctuation of the over-mode circular waveguide directional coupler is reduced.
The phase superposition principle is as follows:
in case of equidistant coupling, the phases of the forward and backward waves:
wherein S is the distance between the coupling holes, beta1Is the phase constant, beta, of the operating mode TEmn mode in the main waveguide (over-mode circular waveguide)2The phase constant of the operating mode in the TE10 mode of the sub waveguide (non-standard rectangular waveguide);
as long as
The condition of forward wave in-phase superposition can be satisfied.
As long as
The condition of reverse wave reverse phase cancellation can be satisfied.
The design key points are as follows:
1. knowing the radius or diameter of the main waveguide (over-mode circular waveguide), the cutoff wave number of the TEmn mode in the operating mode in the main waveguide can be solved, and the cutoff wave number of the TE10 mode in the sub-waveguide can be adjusted by adjusting the width dimension (the narrow dimension is the same as that of the standard rectangular waveguide) of the sub-waveguide (non-standard rectangular waveguide), so that the cutoff wave number of the TE10 mode is the same as that of the TEmn mode in the main waveguide. So that the phase constant beta of the working mode TEmn mode in the main waveguide at any frequency point in the working frequency band1Phase constant beta with the TE10 mode of operation in the secondary waveguide2Are equal. As can be seen from the conditions for the forward wave in-phase superposition in equations (1) and (2), the conditions for the forward wave in-phase superposition are satisfied for any coupling hole pitch:
2. from the conditions of reverse wave reverse phase cancellation in the equations (1) and (3), the coupling hole pitch S satisfying the reverse wave reverse phase cancellation conditions can be obtained.
3. And designing a strip mode suppression/absorption device according to the electric field distribution of a high-order mode in the auxiliary waveguide, so that the attenuation of the high-order mode is far greater than that of a main mode of the auxiliary waveguide.
Compared with the traditional overmoded circular waveguide directional coupler, the invention introduces the nonstandard overmoded rectangular waveguide to replace the standard rectangular waveguide in the traditional overmoded circular waveguide directional coupler. The cut-off wave number of a fundamental mode TE10 mode of the non-standard overmoded rectangular waveguide is changed by adjusting the size of the non-standard overmoded rectangular waveguide, so that the cut-off wave number of the fundamental mode TE10 mode of the non-standard overmoded rectangular waveguide is the same as the cut-off wave number of a working mode TEmn mode in the overmoded circular waveguide, the propagation (phase) constant of the TE10 mode at any frequency point is the same as the propagation constant of the working mode TEmn, further forward waves of the coupler can meet the same-direction superposition condition at any frequency point, and the purposes of expanding the working bandwidth of the overmoded circular waveguide directional coupler and reducing in-band coupling degree fluctuation are achieved. The secondary waveguide adopts a double-arm coupling structure, and a strip-shaped mode suppression/absorption device is added in the secondary waveguide to suppress the generation and transmission of a TEmn (m > 1) mode; meanwhile, a double-wedge absorption load is arranged on one side of the output port of the auxiliary waveguide, so that the mutual influence between the forward coupling port and the reverse coupling port is reduced, and the measurement error of the directional coupler is further reduced. The invention has the following main advantages: 1. the working frequency band is wide; 2. the isolation degree in the working frequency band is high; 3. the coupling degree fluctuation in the working frequency band is small.
Drawings
FIG. 1 is an axial schematic view of a novel over-mode circular waveguide directional coupler;
FIG. 2 is a cross-sectional view of the novel over-mode circular waveguide broadband directional coupler;
FIG. 3 is a cross-sectional view of a dual wedge microwave, millimeter wave absorbing load;
fig. 4 shows the degree of coupling between the added strip-shaped mode suppression/absorption device and the non-added strip-shaped mode suppression/absorption device of the novel over-mode circular waveguide broadband directional coupler;
FIG. 5 is a parameter diagram of TE20 mode transmission characteristics in the sub-waveguide when the novel over-mode circular waveguide broadband directional coupler is added with the strip mode suppression/absorption device and is not added with the strip mode suppression/absorption device;
FIG. 6 is a diagram of reflection parameters versus transmission parameters for the novel over-mode circular waveguide broadband directional coupler;
fig. 7 shows the coupling degree and isolation degree of the novel simulation over-mode circular waveguide broadband directional coupler.
Wherein: number 1 in fig. 1, 2, 3 denotes an overmoded circular waveguide (main waveguide) entrance port; 2 denotes a non-standard overmoded rectangular E-bend waveguide (backward wave); 3 represents a double-wedge microwave and millimeter wave absorption load; 4 denotes a non-standard overmoded rectangular E-bend waveguide (forward wave); 5 denotes an overmoded circular waveguide (main waveguide) entrance port; 6 denotes a non-standard rectangular waveguide (sub-waveguide); 7 coupling the round holes; 8 a stripe pattern suppression/absorption device; 9 double-wedge wave-absorbing structure
Detailed Description
A broadband circular waveguide directional coupler for microwave power measurement, the directional coupler comprising: an overmoded circular waveguide (1) (i.e., a main waveguide), a two-arm sub-waveguide; the two-arm auxiliary waveguide comprises an upper arm auxiliary waveguide and a lower wall auxiliary waveguide, and the upper arm auxiliary waveguide or the lower wall auxiliary waveguide comprises: the device comprises a non-standard rectangular waveguide (6), two non-standard overmoded rectangular E-bend waveguides (2) and an absorption load (3); the two non-standard overmoded rectangular E-shaped bent waveguides are respectively arranged at two ends of the non-standard rectangular waveguide and are connected with the non-standard rectangular waveguide, and one of the two non-standard overmoded rectangular E-shaped bent waveguides is connected with an absorption load (3); the non-standard rectangular waveguide of the upper arm auxiliary waveguide and the non-standard rectangular waveguide of the lower wall auxiliary waveguide are respectively arranged on two sides of the over-mode circular waveguide and are parallel to the microwave transmission direction of the over-mode circular waveguide, and the non-standard rectangular waveguide and the over-mode circular waveguide are communicated through a coupling circular hole; and the absorption loads in the upper arm auxiliary waveguide and the lower wall auxiliary waveguide are arranged on different sides. The bending angle of the non-standard over-mode E bending moment waveguide is 90 degrees, and the bending radius is not less than 2 times of the length of the narrow edge of the non-standard rectangular waveguide. The effect of the non-standard over-mode E bending moment waveguide is to change the propagation direction of energy in the secondary waveguide, so that the connection with an external detection system is facilitated; so that the standing-wave ratio is guaranteed to be less than 1.05 in the whole working frequency band. The coupling circle between the non-standard rectangular waveguide and the over-mode circular waveguide is two rows of symmetrically distributed round holes, and the arrangement direction of the round holes is consistent with the transmission direction of microwaves and millimeter waves in the main waveguide; the radius and height of the coupling holes are determined by the coupling degree of the directional coupler, the distance between the coupling holes is determined by the working mode and the working frequency in the over-mode circular waveguide, and the number of the coupling holes is determined by the working bandwidth. The absorbing load is rectangular, the outer part of the absorbing load is made of metal materials, the inner part of the absorbing load is made of wave-absorbing materials, and the inner wave-absorbing materials are double-wedge-shaped. The purpose is to increase the wave-absorbing area of the material, reduce the energy reflection of microwave and millimeter wave, and improve the working bandwidth and working stability of the secondary waveguide. And a strip mode suppression/absorption device (8) is arranged on the inner wall of the waveguide on one side of the non-standard rectangular waveguide far away from the over-mode circular waveguide, the installation direction of the strip mode suppression/absorption device is consistent with the directions of the main waveguide and the auxiliary waveguide, the length of the strip mode suppression/absorption device is consistent with the length of the auxiliary waveguide, and the thickness of the strip mode suppression/absorption device is determined by a suppression mode, a suppression degree and the fluctuation of the coupling degree.
The invention is further described in detail with reference to a design example of a novel over-mode circular waveguide broadband directional coupler operating in Ka-band and TE01 mode and the accompanying drawings:
the technical index requirements of the Ka-band novel over-mode circular waveguide broadband directional coupler are as follows:
main waveguide working mode: TE01 mode;
working frequency band: ka band (26.5GHz-40 GHz);
non-standard rectangular waveguide broadside dimensions: 13.04 mm, narrow side dimension: 3.556 mm
Coupling degree: -48 dB; isolation (directivity): 25 dB; fluctuation of in-band coupling degree: not more than +/-0.5 dB
Wherein: overmoded circular waveguide (main waveguide) (1): radius 16 mm, length 240 mm; in order to enable the directional coupler to work effectively in the whole Ka waveband, the number of coupling holes is selected to be 32, the radius of the holes is 1 mm, the height of the holes is 1 mm, and the distance between the holes is 2.84 mm; non-standard over-mode rectangular waveguide (sub-waveguide): the width dimension is 13.04 mm, and the narrow dimension is 3.556 mm; non-standard overmoded rectangular E-bend waveguide: the bending radius is 8 mm; double-wedge microwave and millimeter wave absorption load: the gradual change length is 90 mm; stripe pattern suppression/absorption device: 240 mm in length, 0.4 mm in thickness and 1 mm in width.
Fig. 4 is a comparison graph of coupling ratio of the novel over-mode circular waveguide broadband directional coupler with the added strip-shaped mode suppression/absorption device and without the added strip-shaped mode suppression/absorption device. The coupling degree characterizes the energy of the forward wave which is coupled into the rectangular waveguide by the over-mode circular waveguide through the coupling small hole. As can be seen from the figure: the coupling degree of the directional coupler without the strip-shaped mode suppression/absorption device is about-46 dB, and the fluctuation range is about +/-1.5 dB; the coupling degree of the directional coupler with the strip mode inhibiting/absorbing device is about-48.6 dB, and the fluctuation range is about +/-0.2 dB. Therefore, the fluctuation of the coupling degree of the directional coupler can be effectively reduced by adding the strip mode suppression/absorption device. The novel directional coupler of the design can effectively achieve the design target, and the fluctuation of the in-band coupling degree is superior to the design initial target.
Fig. 5 is a parameter diagram of TE20 mode transmission characteristics in the sub-waveguide when the strip mode suppression/absorption device is added and not added to the novel over-mode circular waveguide broadband directional coupler. It can be seen that the attenuation of the TE20 mode forward wave (about-75 dB) in the sub-waveguide of the directional coupler with the added stripe mode suppression/absorption device is about 25dB lower than that of the TE20 mode forward wave (-50dB) in the sub-waveguide of the directional coupler without the added stripe mode suppression/absorption device, so that the stripe mode suppression/absorption device can effectively absorb the TE20 mode in the sub-waveguide.
Fig. 6 shows the reflection parameter (S11) and transmission parameter (S21) of the new simulation-obtained over-mode circular waveguide broadband directional coupler. S11 represents the log ratio of the energy reflected back to the microwave incident port and the input energy, S21 represents the log ratio of the energy transmitted to the microwave output port and the input port energy, and the reflection parameter is generally required to be less than-30 dB and the transmission parameter is required to be more than-0.2 dB in engineering application. As can be seen from FIG. 6, the S11 parameter of the directional coupler in the simulation is smaller than-55 dB, the transmission parameter is larger than-0.02 dB, and the simulation result completely meets the working application target.
Fig. 7 shows the coupling degree and isolation degree of the novel simulation over-mode circular waveguide broadband directional coupler. The figure shows that the coupling degree of the novel over-mode circular waveguide broadband directional coupler in the working frequency band of 26.5-40GHz is about-48.6 dB, the fluctuation of the in-band coupling degree is less than +/-0.2 dB, the isolation degree is greater than 25dB, and the requirement of design indexes is met.
The above examples are only for convenience of explaining the novel directional coupler, the directional coupler can be applied to directional couplers of different modes and different frequency bands, such as overmoded circular waveguides TE01-TE10 (rectangular waveguide), TE21-TE10, TE11-TE10 and the like of other frequency bands, and the distance between coupling holes is determined by the corresponding frequency band and the working mode.
Claims (1)
1. A broadband circular waveguide directional coupler for microwave power measurement, the directional coupler comprising: an overmoded circular waveguide (1) and a double-arm auxiliary waveguide; the two-arm auxiliary waveguide comprises an upper arm auxiliary waveguide and a lower arm auxiliary waveguide, and the upper arm auxiliary waveguide and the lower arm auxiliary waveguide both comprise: the device comprises a non-standard rectangular waveguide (6), two non-standard overmoded rectangular E-bend waveguides (2) and an absorption load (3); the two non-standard over-mode rectangular E-shaped bent waveguides are respectively arranged at two ends of the non-standard rectangular waveguide and are connected with the non-standard rectangular waveguide, one non-standard over-mode rectangular E-shaped bent waveguide is connected with an absorption load (3), and the absorption loads in the upper arm auxiliary waveguide and the lower arm auxiliary waveguide are arranged on different sides; the non-standard rectangular waveguide of the upper arm auxiliary waveguide and the non-standard rectangular waveguide of the lower arm auxiliary waveguide are respectively arranged on two sides of the over-mode circular waveguide which are symmetrical relative to the central axis and are parallel to the microwave transmission direction of the over-mode circular waveguide, and the non-standard rectangular waveguide and the over-mode circular waveguide are communicated through a coupling round hole; the bending angle of the non-standard overmoded rectangular E-shaped bent waveguide is 90 degrees, and the bending radius is not less than 2 times of the length of the narrow side of the non-standard rectangular waveguide; the coupling round holes between the non-standard rectangular waveguide and the over-mode circular waveguide are two rows of symmetrically distributed coupling round holes, and the arrangement direction of the coupling round holes is consistent with the transmission direction of microwaves and millimeter waves in the over-mode circular waveguide; the radius and the height of the coupling round holes are determined by the coupling degree of the directional coupler, the distance between the coupling round holes is determined by the working mode and the working frequency in the over-mode circular waveguide, and the number of the coupling round holes is determined by the working bandwidth; the absorption load is rectangular, the outer part of the absorption load is made of metal materials, the inner part of the absorption load is made of wave-absorbing materials, and the inner wave-absorbing materials are double-wedge-shaped; the strip mode suppression/absorption device is arranged on the inner wall of the waveguide on the side, far away from the over-mode circular waveguide, of the non-standard rectangular waveguide, the installation direction of the strip mode suppression/absorption device is consistent with the direction of the over-mode circular waveguide and the direction of the non-standard rectangular waveguide, the length of the strip mode suppression/absorption device is consistent with that of the non-standard rectangular waveguide, and the thickness of the strip mode suppression/absorption device is determined by a suppression mode, suppression degree or coupling degree fluctuation.
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| CN109638403B (en) * | 2019-01-15 | 2021-02-02 | 电子科技大学 | Dual-mode compact type over-mode directional coupler |
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| CN110444847B (en) * | 2019-08-07 | 2021-07-20 | 深圳大学 | High-order over-mode power coupler based on multi-branch waveguide |
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| CN112597657B (en) * | 2020-12-29 | 2024-04-16 | 北京无线电计量测试研究所 | Millimeter wave S parameter transmission amplitude standard design method |
| CN113437464B (en) * | 2021-08-27 | 2021-11-23 | 成都雷电微晶科技有限公司 | Double-waveguide/multi-waveguide channel structure working in W waveband and TR module |
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