CN113839219A - Design method of broadband high-power circular polarizer - Google Patents
Design method of broadband high-power circular polarizer Download PDFInfo
- Publication number
- CN113839219A CN113839219A CN202111014533.1A CN202111014533A CN113839219A CN 113839219 A CN113839219 A CN 113839219A CN 202111014533 A CN202111014533 A CN 202111014533A CN 113839219 A CN113839219 A CN 113839219A
- Authority
- CN
- China
- Prior art keywords
- phase
- waveguide
- shifting
- circular polarizer
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/24—Polarising devices; Polarisation filters
Landscapes
- Waveguide Switches, Polarizers, And Phase Shifters (AREA)
Abstract
The invention discloses a design method of a broadband high-power circular polarizer, and belongs to the field of high-power millimeter wave devices. The method obtains an equivalent low-dispersion waveguide phase-shifting section by utilizing the combination of overmoded waveguide structures with various dispersion characteristics, so that the phase constant difference value of two orthogonal linear polarization modes entering the waveguide phase-shifting section tends to be constant, and the method is favorable for obtaining stable phase difference after a wave beam passes through the waveguide phase-shifting section. Meanwhile, the overmoded waveguide is used as a phase shifting carrier, and the high-power capacitor has the characteristic of high power capacity without the existence of easily-punctured objects such as a medium insert and the like.
Description
Technical Field
The invention relates to the field of high-power millimeter wave devices, in particular to a design method for a high-power millimeter wave transmission link broadband high-power waveguide circular polarizer.
Technical Field
The circular polarizer is a device widely applied in a microwave system and is mainly used for the interconversion between linear and circular polarization. Generally, a waveguide circular polarizer can decompose incident linearly polarized electromagnetic waves into two linearly polarized waves with equal amplitude and orthogonal to each other, so as to regulate and control the phase difference of the two linearly polarized waves to 90 degrees, and then synthesize the two linearly polarized waves into a beam of circularly polarized waves; or the circularly polarized wave is decomposed into two linear polarized waves with equal amplitude, orthogonality and 90-degree difference, the two linear polarized waves are in phase after phase regulation, and then a beam of linear polarized wave is synthesized. TE adopted by partial power sources in high-power transmission link based on gyrotron traveling wave tube11The mode is circularly polarized wave, which is very inconvenient to adjust and control such as steering, power synthesis and the like, and can not ensure to realize two orthogonal TE11The modes are controlled simultaneously. For example, in a waveguide bend, an electromagnetic wave can undergo a change in propagation direction through the bend. However, for circularly polarized TE11In order to ensure circular polarization characteristics after turning, the design of the mode elbow needs to design two polarization directions simultaneously, so that additional phase difference cannot be introduced. In other words, the designed bend needs to be bimodal, and this is very difficult for a device with the same phase change for the two modes. Therefore, a circular polarizer is required to convert the linear polarization wave into a linear polarization wave, and the linear polarization wave or the circular polarization wave is converted into the linear polarization or the circular polarization according to requirements after the steering control is performed, so that the electromagnetic wave can be more conveniently and efficiently regulated and controlled in the whole link.
In the high-power cyclotron traveling wave tube system, the high-power circular polarizer also has high power capacity and wide bandwidth due to the characteristics of the broadband and high output power of the front-end power source. There are many ways to implement the circular polarizer proposed at present, such as a circular waveguide or square waveguide polarizer with ripple loading, a ridge waveguide circular polarizer, a dielectric insert circular polarizer, etc. (waveguide circular polarization technology, author: Ding Xiao Lei, Mengming Xia telemetering telemetry remote sensing technology, Vol. 35, No. 4, 7 months 2014), but these circular polarizers all have the defect that the power capacity and the working bandwidth cannot be considered simultaneously. The conventional waveguide circular polarizer with the periodically loaded ripple can well realize the broadband characteristic, but the power capacity is limited due to the small size of the device. While circular polarizers based on uniform straight waveguides (e.g., elliptical waveguides, corner-cut square waveguides, etc.) have large power capacities, their broadband and compactness cannot be realized at the same time, and it is necessary to sacrifice a certain bandwidth to realize miniaturization of devices. As for circular polarizers such as dielectric diaphragm loading and tuning screw loading, the disadvantages of small power capacity, large loss and the like are further shown under the condition of high frequency and high power.
Disclosure of Invention
The invention provides a design method of a broadband high-power circular polarizer for a high-power gyrotron traveling wave tube link system, aiming at the problems of low power capacity, narrow bandwidth, large device size and the like of a waveguide circular polarizer in the prior art. The circular polarizer can obtain high-efficiency energy transmission in a broadband, and meanwhile, stable 90-degree phase difference is achieved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a design method of a broadband high-power circular polarizer is characterized in that the circular polarizer is of an over-mode waveguide structure and comprises a waveguide phase-shifting section, an input transition section and an output transition section, wherein the input transition section and the output transition section are arranged at two ends of the waveguide phase-shifting section; the design method of the circular polarizer comprises the following steps:
s1, determining the calibers of an input port and an output port of the circular polarizer according to the known calibers of the front cascade device and the rear cascade device.
In order to facilitate connection with the front and rear stage devices, the designed aperture of the circular polarizer should be consistent with the output aperture and shape of the front and rear stage devices.
S2, determining the maximum phase shift error of the circular polarizer in the working bandwidth and the initial length L of the waveguide phase shift section according to a design target, and designing an initial model of the waveguide phase shift section.
S2-1, dividing the working frequency band of the circular polarizer into N small working frequency bands (N is more than or equal to 2, N is an integer), and selecting a basic phase shift structure as a phase shift section corresponding to each small working frequency band to satisfy that the phase difference of two orthogonalized modes in the corresponding bandwidth is a constant.
For the circular polarizer with higher working bandwidth and smaller phase fluctuation, the working frequency band is divided more, i.e. the number of phase-shifting segments is increased.
S2-2, setting the initial length of the N phase-shifting sections as L/N, and obtaining the initial model of the waveguide phase-shifting section.
Furthermore, the basic phase shift structure is a waveguide phase shift structure with different dispersion characteristics and capable of propagating orthogonal polarization, that is, the phase change amounts of electromagnetic waves transmitted through the basic phase shift structure with the same length are different. The waveguide phase shifting structures can be overmoded rectangular waveguides, elliptical waveguides, or overmoded rectangular waveguides, elliptical waveguides or square waveguides with uniform phase adjusting structures (such as corrugated grooves, screws and the like).
And S3, performing performance analysis on the initial model of the waveguide phase-shifting section, and judging whether the initial model of the waveguide phase-shifting section meets the set maximum phase-shifting error in the working frequency band. If so, carrying out the next step; if the phase difference can not be met, adjusting the length of each phase shift section according to the dispersion characteristic of each phase shift section, performing dispersion complementation, and performing next step through multiple iterations until the set maximum phase shift error is met.
S4, designing an input transition structure and an output transition structure for connecting front and rear devices and a connection transition structure between the phase-shifting sections according to the model of the waveguide phase-shifting section determined in the step S3 to obtain an initial model of the circular polarizer; and then optimizing the structural parameters of the initial model, reducing the reflection of the circular polarizer, realizing the equal division of the mode power in two orthogonal polarization directions and the phase difference of 90 degrees, and finishing the design of the whole circular polarizer.
The working principle of the high-power broadband circular polarizer is as follows:
the waveguide phase-shifting section is realized by linear weighted combination of a plurality of basic phase-shifting structures with different dispersion characteristics, and the total equivalent dispersion characteristic can be regarded as the linear weighted superposition of the dispersion characteristics of the phase-shifting sections. The single phase shifting section can be realized by a uniformly-changed corrugated groove structure with high power capacity, an elliptical structure, a rectangular structure, a circular waveguide-like structure and the like. Different propagation constant frequency responses can be realized by adjusting the period, the depth and the width of the corrugated groove, the major and minor axes of the elliptical waveguide and the like. By selecting different basic phase shift structures or different corrugated groove structures for combination, linear superposition of curves of different frequencies and propagation constants can be realized, so that dispersion characteristics of the waveguide phase shift section at high frequency and low frequency are kept consistent, frequency response of a flat propagation constant is obtained in a broadband, and broadband circular polarization is realized.
The total equivalent propagation constant of the waveguide phase-shifted section can be expressed as:
wherein, betaeIs the equivalent propagation constant, [ beta ], of the phase-shifted segment of the waveguide]A transverse vector composed of propagation constants of the respective phase-shifted segments, [ L ]]And normalizing the transverse vector formed by the length for each phase-shifting section. Beta is anDenotes the propagation constant, L, of the n-th phase-shifted segmentnDenotes the length of the nth phase-shifted segment, n being an integer.
The input transition section, the waveguide phase shift section and the output transition section of the invention all generate phase difference, but the main phase shift part is mainly concentrated in the waveguide phase shift section. The transition section is mainly used for carrying out small-range optimization adjustment on the phase while guaranteeing efficient propagation. Finally, the two orthogonally polarized waves are enabled to obtain a stable 90-degree phase difference within the working bandwidth, and the overall optimization design is completed.
In summary, due to the adoption of the technical scheme, the invention has the following advantages:
the invention obtains an equivalent low-dispersion waveguide phase-shifting section by utilizing the combination of overmoded waveguide structures with various dispersion characteristics, so that the phase constant difference value of two orthogonal linear polarization modes entering the waveguide phase-shifting section tends to be constant, and the stable phase difference can be obtained after a wave beam passes through the waveguide phase-shifting section. Meanwhile, the overmoded waveguide is used as a phase shifting carrier, and the high-power capacitor has the characteristic of high power capacity without the existence of easily-punctured objects such as a medium insert and the like.
Drawings
Fig. 1 is a schematic structural diagram of a circular polarizer designed in this embodiment.
Fig. 2 is a cross-sectional view of the circular polarizer according to the present embodiment.
FIG. 3 is a schematic diagram showing the dimensions of the elliptical waveguide and the elliptical groove of the waveguide phase section part designed in the present embodiment.
FIG. 4 shows two orthogonal constant amplitude linear polarizations TEs of the present invention11The simulation result of the amplitude of the mode from the input port to the output port is shown schematically.
FIG. 5 is a diagram of two TEs of the present invention11The phase simulation result of the mode from the input port to the output port is shown schematically.
The reference numbers illustrate: the device comprises a waveguide flange 1, a port positioning pin 2A, a circular polarizer positioning pin 2B, a port assembly screw 3A, a circular polarizer assembly screw 3B, an input/output transition section 4, an elliptical waveguide phase-shifting section 5 and an elliptical groove phase-shifting section 6.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings to design a circular polarizer for a high power millimeter wave system operating at 16GHz-23 GHz.
S1, determining the radius of an input port and an output port of the circular polarizer to be 16 mm according to the known calibers of the front cascade device and the rear cascade device.
S2, determining the maximum phase shift error of the circular polarizer in the working bandwidth and the initial length L of the waveguide phase shift section according to a design target, and designing an initial model of the waveguide phase shift section.
S2-1, the working frequency band of the designed circular polarizer is 16GHz-23GHz, the working frequency band is divided into 2 small working frequency bands which are 20-23GHz (frequency band A) and 16-20GHz (frequency band B) respectively; an elliptical waveguide is selected as a first phase shifting section, and severe overmoulding is caused due to power capacity requirements, so that TE of two polarizations11The mode propagation constant has a large difference value in a low frequency range and a small difference value in a high frequency range, so that the bandwidth of the circular polarizer is narrow; thus, periodic corrugated slot loading is introduced as a second phase shifting segment in an equally sized elliptical waveguide. The two phase-shifting sections satisfy that the phase difference of two orthogonal modes in the corresponding bandwidth is a constant.
The periodic corrugated groove elliptic waveguide can effectively improve the dispersion characteristic of a high frequency band, but has little influence on a low frequency band; meanwhile, the calibers of the two phase-shifting sections are the same, so that the two phase-shifting sections are convenient to be in transitional connection.
Specifically, as shown in FIG. 3, the major axis a of the elliptical waveguide116.5 mm, b1The minor axis was 16 mm and the initial length was 200 mm.
The initial length of the periodic corrugated groove elliptical waveguide is 200 mm, the period of the corrugated groove is T1.5 mm, the groove width is 1 mm, the long axis of the corrugated groove is orthogonal to the long axis of the elliptical waveguide, and the long axis a2Is 17.3 mm, minor axis b215.5 mm; since the minor axis of the elliptical trough is smaller than the major axis of the elliptical waveguide, the loaded corrugation trough has two symmetrical openings.
S3, performing performance analysis on the initial model of the waveguide phase-shifting section; it can be known that the initial model of the waveguide phase-shifting section can not meet the set maximum phase-shifting error in the working frequency band, so that the length of the initial model can be adjusted according to the dispersion characteristics of the two phase-shifting sections to carry out dispersion complementation.
In the working frequency band, two orthogonally polarized beams present different dispersion characteristics, and the propagation constant difference of the two beams fluctuates along with the frequency change. In order to obtain a stable 90 degree phase difference in a wide band, the fluctuation should be as small as possible. The propagation constant difference of the two polarized beams of the first phase-shifted segment (elliptical waveguide) is known to be small in the frequency band a (20-23GHz) and large in the frequency band B (16-20GHz), which indicates that when the length of the first phase-shifted segment is 200 mm, the phase difference brought by the frequency band a (20-23GHz) is smaller than the frequency band B (16-20GHz), which is the reason for limiting the phase-shifted bandwidth. At this time, under the condition that the total length L meets the design requirement, the lengths of the two phase-shifting sections are adjusted, the length of the first phase-shifting section is adjusted to be 60 mm, the length of the second phase-shifting section (the periodic elliptical corrugated slot waveguide) is adjusted to be 340 mm, and when the length of the second phase-shifting section is 340 mm, the phase difference in the frequency band A is larger than that in the frequency band B; the two phase-shifted segments compensate each other in dispersion, and in the case of a total length L of 400 mm, the equivalent dispersion is linearly weighted by both. The weighted dispersion characteristic has the dispersion characteristics of two phase-shifting sections at the same time, and the dispersion broadband matching can be realized, so that the purpose of widening the bandwidth is achieved.
S4, designing an input transition structure and an output transition structure for connecting front and rear devices and a connection transition structure between the phase-shifting sections according to the model of the waveguide phase-shifting section determined in the step S3 to obtain an initial model of the circular polarizer; and then optimizing the structural parameters of the initial model, reducing the reflection of the circular polarizer, realizing the equal division of the mode power in two orthogonal polarization directions and the phase difference of 90 degrees, and finishing the design of the whole circular polarizer.
Specifically, the elliptical waveguide is divided into two sections with the same length, and the two sections are arranged on two sections of the periodic corrugated groove elliptical waveguide, so that the two sections can be conveniently connected with an input/output transition structure; the input transition structure adopts a circular-elliptical linear transition structure, the output transition structure and the input transition structure have the same size and are symmetrically arranged at two ends of the waveguide phase-shifting section. When the linear polarization TE11 mode is input, the phase modulation is carried out along the input transition structure and is decomposed into two orthogonal linear polarization TE11 modes. Then, two phase-modulated orthogonal linear polarizations TE11Modes are synthesized in the output transition structure to form circularly polarized TE11A wave.
Two TEs in an elliptical waveguide in the case of over-mode11The modal dispersion curves are very close and the propagation constant difference is small, resulting in a long required phase shift section. In addition, the transition section makes the circular polarizer very heavy. And after loading the elliptical trough, the difference in the propagation constants of the two modes increases, thereby reducing the device size. Furthermore, the size of the elliptical groove and the length of the elliptical waveguide can be adjusted, so that the difference value of the two propagation constants approaches to a constant along with the frequency change, and further, the stable phase difference in the broadband is realized.
As shown in fig. 1 and 2, the circular polarizer of this embodiment can convert front-end input circular polarized waves into linear polarized waves, which facilitates design of transmission links such as rear-end turning and power combining. The circular polarizer is symmetrically split into two halves and then integrally assembled after machining. Circular waveguides (the radius is 16 mm) connected in front and back are connected into an input port of the circular polarizer through a flange 1, and a port positioning pin 2A and a port assembling screw 3A ensure the connection precision of a front-end power source and the circular polarizer. The assembly precision of the front-end power source and the circular polarizer is ensured. As shown in the attached figure 2, the circular polarizer is symmetrically split for processing, and the assembly precision is ensured through a circular polarizer positioning pin 2B and a circular polarizer assembly screw 3B. Since the circular polarizer can perform the conversion between the linear-circular polarization, the front-end circular polarized wave/linear polarized wave incident to the circular polarizer through the input port can be decomposed into two linear polarized waves having a phase difference of 90 °/0 ° and being orthogonal in equal amplitude. After passing through the circular-elliptical linear input transition section 4, the two-line polarized waves enter the waveguide phase shift section, and the polarization directions are respectively perpendicular to the long axis of the elliptical waveguide 5 and parallel to the long axis of the elliptical waveguide 5. After the phase modulation of the integral phase shift section of the circular polarizer, the phase difference of the two polarized waves is 0 degree/90 degrees. Then, the two polarized waves enter the elliptical-circular linear output transition section 4, at the moment, the two polarized waves are in-phase/orthogonal and can be synthesized into a linearly polarized wave/circularly polarized wave, and the polarization direction forms an included angle of 45 degrees with the long axis of the elliptical waveguide. In addition, the phase influence brought by the input/output transition section 4 is small and can be ignored, or the phase shift compensation is carried out by the elliptic waveguide section.
As shown in FIG. 4, within the operating band of 15-23GHz, two orthogonal linear polarizations TE11The insertion loss of the wave is better than 0.1 dB.
As shown in fig. 5, in the operating band of 15-23GHz, the two-line polarized waves have a phase difference of about 90 ° ± 3 ° after passing through the circular polarizer, and the line-circular polarization conversion can be well realized.
Claims (3)
1. A design method of a broadband high-power circular polarizer is characterized in that the circular polarizer is of an over-mode waveguide structure and comprises a waveguide phase-shifting section, an input transition section and an output transition section, wherein the input transition section and the output transition section are arranged at two ends of the waveguide phase-shifting section; the design method of the circular polarizer comprises the following steps:
s1, determining the calibers of an input port and an output port of a circular polarizer according to the known calibers of a front cascade device and a rear cascade device;
s2, determining the maximum phase shift error of the circular polarizer in the working bandwidth and the initial length L of the waveguide phase shift section according to a design target, and designing an initial model of the waveguide phase shift section;
s2-1, dividing the working frequency band of the circular polarizer into N small working frequency bands, and selecting a basic phase shift structure as a phase shift section corresponding to each small working frequency band, wherein the phase difference of two orthogonalized modes in the corresponding bandwidth is a constant; wherein N is not less than 2 and is an integer;
s2-2, setting the initial length of the N selected phase-shifting sections as L/N to obtain an initial model of the waveguide phase-shifting section;
s3, performing performance analysis on the initial model of the waveguide phase-shifting section, and judging whether the initial model of the waveguide phase-shifting section meets the set maximum phase-shifting error in a working frequency band; if so, carrying out the next step; if the phase difference can not be met, adjusting the length of each phase-shifting section according to the dispersion characteristic of each phase-shifting section, performing dispersion complementation, and performing next step through multiple iterations until the set maximum phase-shifting error is met;
s4, designing an input transition structure and an output transition structure for connecting front and rear devices and a connection transition structure between the phase-shifting sections according to the model of the waveguide phase-shifting section determined in the step S3 to obtain an initial model of the circular polarizer; and then optimizing the structural parameters of the initial model, reducing the reflection of the circular polarizer, realizing the equal division of the mode power in two orthogonal polarization directions and the phase difference of 90 degrees, and finishing the design of the whole circular polarizer.
2. The method of claim 1, wherein the fundamental phase shifting structure is a waveguide phase shifting structure with different dispersion characteristics capable of propagating orthogonal polarizations.
3. The design method of the broadband high-power circular polarizer of claim 1 or 2, wherein the waveguide phase shifting structure is an over-mode rectangular waveguide, an elliptical waveguide, or an over-mode rectangular waveguide, an elliptical waveguide or a square waveguide with a uniform phase adjusting structure; the uniform phase adjusting structure is a corrugated groove and a screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111014533.1A CN113839219B (en) | 2021-08-31 | 2021-08-31 | Design method of broadband high-power circular polarizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111014533.1A CN113839219B (en) | 2021-08-31 | 2021-08-31 | Design method of broadband high-power circular polarizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113839219A true CN113839219A (en) | 2021-12-24 |
| CN113839219B CN113839219B (en) | 2022-10-14 |
Family
ID=78961898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111014533.1A Active CN113839219B (en) | 2021-08-31 | 2021-08-31 | Design method of broadband high-power circular polarizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113839219B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457033A (en) * | 2013-08-27 | 2013-12-18 | 上海交通大学 | Compact broadband circular polarizer |
| US20150194720A1 (en) * | 2013-03-15 | 2015-07-09 | The Board Of Trustees Of The Leland Stanford Junior University | Compact Waveguide Circular Polarizer |
| CN106653523A (en) * | 2016-12-16 | 2017-05-10 | 电子科技大学 | Output device of TE1,1 mode gyro traveling wave tube |
| CN107039712A (en) * | 2017-04-26 | 2017-08-11 | 电子科技大学 | One kind is applied to TE1,1The compact overmoded waveguide elbow of mould gyrotron traveling wave tube |
| CN107634296A (en) * | 2017-09-01 | 2018-01-26 | 西北核技术研究所 | High-Power Microwave TE11Mould polarized rotation synthesizer and polarized rotation synthetic method |
-
2021
- 2021-08-31 CN CN202111014533.1A patent/CN113839219B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150194720A1 (en) * | 2013-03-15 | 2015-07-09 | The Board Of Trustees Of The Leland Stanford Junior University | Compact Waveguide Circular Polarizer |
| CN103457033A (en) * | 2013-08-27 | 2013-12-18 | 上海交通大学 | Compact broadband circular polarizer |
| CN106653523A (en) * | 2016-12-16 | 2017-05-10 | 电子科技大学 | Output device of TE1,1 mode gyro traveling wave tube |
| CN107039712A (en) * | 2017-04-26 | 2017-08-11 | 电子科技大学 | One kind is applied to TE1,1The compact overmoded waveguide elbow of mould gyrotron traveling wave tube |
| CN107634296A (en) * | 2017-09-01 | 2018-01-26 | 西北核技术研究所 | High-Power Microwave TE11Mould polarized rotation synthesizer and polarized rotation synthetic method |
Non-Patent Citations (4)
| Title |
|---|
| LE-TIAN GUO 等: "Design of a novel phase shifter for high power microwave applications", 《2015 IEEE INTERNATIONAL VACUUM ELECTRONICS CONFERENCE (IVEC)》 * |
| YOULEI PU 等: "Theoretical and Experimental Investigations on a Compact and Broadband TE01 Oversized Deformed Waveguide Bend", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
| 吴泽威等: "高阶圆波导模式圆极化器的研究", 《红外与毫米波学报》 * |
| 张治强等: "X波段高功率微波TE_(11)模圆极化器", 《强激光与粒子束》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113839219B (en) | 2022-10-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8493161B2 (en) | Compact excitation assembly for generating a circular polarization in an antenna and method of fashioning such a compact excitation assembly | |
| US4228410A (en) | Microwave circular polarizer | |
| US20020021865A1 (en) | Mode translating waveguide adapter for a quasi-optic grid array | |
| US7944324B2 (en) | Compact orthomode transduction device optimized in the mesh plane, for an antenna | |
| US9419322B2 (en) | Compact waveguide circular polarizer | |
| US6097264A (en) | Broad band quad ridged polarizer | |
| US10135150B2 (en) | Quasi-optical beamformer with lens and plane antenna comprising such a beamformer | |
| CN112018524B (en) | Design method of single-port input arbitrary N-port output VICTS feed excitation layer | |
| US6876277B2 (en) | E-plane filter and a method of forming an E-plane filter | |
| WO2021034270A1 (en) | A linear-to-circular polarizer, feeding network, antenna and antenna assembly | |
| Shu | Analysis of elliptical waveguides by differential quadrature method | |
| CN113839219B (en) | Design method of broadband high-power circular polarizer | |
| Zhou et al. | Design of coupled-resonator array antenna for steering beam with extremely high scanning rate | |
| Plaum | Optimization of broadband smooth-wall circular horn antennas | |
| CN112103606A (en) | Adjustable coaxial line type power divider and using method | |
| US4691205A (en) | Beam forming network for circularly polarized shaped beam antenna system | |
| CN112748426B (en) | Monopulse sum-difference network for long-distance high-resolution radar system | |
| Alessandri et al. | Rigorous and efficient fabrication-oriented CAD and optimization of complex waveguide networks | |
| US6879226B2 (en) | Waveguide quardruple mode microwave filter having zero transmission | |
| WO2006027828A1 (en) | Electric power distributing apparatus, electric power combining apparatus, mono-pulse signal combining circuit, array antenna power supplying circuit, and beam shaping circuit | |
| CN114447542A (en) | Slider, phase shifter and base station antenna | |
| Park et al. | Millimeter-Wave Monopulse Filtenna Array with Directive Dielectric Resonators | |
| CN114256569B (en) | Rectangular waveguide mode converter and power distribution synthesizer | |
| CN114696054B (en) | Adjustable power divider, method, electronic device and storage medium | |
| US5532661A (en) | Device for distribution of microwave signals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |