CN107275173B - Confocal waveguide ceramics open annular column microwave absorbing device - Google Patents
Confocal waveguide ceramics open annular column microwave absorbing device Download PDFInfo
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- CN107275173B CN107275173B CN201710467954.7A CN201710467954A CN107275173B CN 107275173 B CN107275173 B CN 107275173B CN 201710467954 A CN201710467954 A CN 201710467954A CN 107275173 B CN107275173 B CN 107275173B
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- open annular
- annular column
- confocal waveguide
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- microwave
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/24—Slow-wave structures, e.g. delay systems
- H01J23/30—Damping arrangements associated with slow-wave structures, e.g. for suppression of unwanted oscillations
Abstract
The invention discloses a kind of confocal waveguide ceramics open annular column microwave absorbing devices, belong to microwave, millimeter wave and THz devices technical field.The device include the confocal waveguide mirror surface of opening of setting symmetrical above and below, its both ends extended segment be respectively input/output terminal and the open annular column for being symmetrically disposed on its two sides.The present invention absorbs the energy given off from high frequency interacting formations using ceramic open annular column, and the microwave that diffraction goes out can multiple roundtrip and absorption in circular column cavity, backward wave oscillation can more preferably be inhibited, it can also prevent hot-spot, it largely solves the heat dissipation problem of high frequency interacting system, improves the stability of confocal waveguide gyrotron traveling wave tube.In addition, since open annular column has bigger inner surface area, the surface area for absorbing radiated electromagnetic wave is bigger in same space volume, and it is higher to microwave absorption efficiency, improve confocal waveguide gyrotron traveling wave tube mean power capacity and stability.
Description
Technical field
The invention belongs to microwave, millimeter wave and THz devices technical field, specifically a kind of confocal waveguide medium
Ceramic ring microwave absorbing device can apply confocal waveguide gyro amplifier part and confocal wave in millimeter wave, terahertz wave band
Lead back to rotation oscillating device.
Background technique
Gyrotron traveling wave tube is a kind of electrovacuum amplifier based on electronic cyclotron maser effect, in millimeter wave or even Terahertz
Frequency range can be realized high-power, broadband, the output of efficient electromagnetic wave power, it is in high-resolution mm-wave imaging, millimeter
Wave confrontation, electronic warfare and microwave telecommunication system etc. are with important application prospects.Currently, gyrotron traveling wave tube is still in development
Stage is generally adopted by the cross section for increasing cavity to increase the output power of gyrotron traveling wave tube, that is, uses higher order mode
Work, but mode competition is thus introduced, causing can not steady operation.Due to the puzzlement of mode competition problem, higher order mode
It is not high with high-frequency gyrotron traveling wave tube overall development level, so being widely used not yet, in order to control spurious mode
Oscillation, guarantees the work of single mode efficient stable, and confocal waveguiding structure comes into being.
Confocal waveguiding structure is a kind of novel interacting formations proposed by america's MIT, it is made of two pieces of cylindrical mirrors,
Wherein the geometric center of waveguide and the focus of cylindrical mirror are overlapped, and it is a kind of sideways open structure, therefore confocal waveguide junction
There are diffraction on the both sides of structure, due to the presence of diffraction loss, so that confocal waveguide is provided with natural attenuation characteristic, and this decline
Subtract and different modes is different, this characteristic just can be used for the inhibition to backward wave interaction competitive mode, i.e., confocal
The model selection characteristic that waveguiding structure itself has, efficiently solves traditional Cyclotron and spends phenomenon together due to size and be difficult to work
In the difficulty of W-waveband and higher Terahertz frequency range.
MIT has carried out the confocal waveguide gyrotron traveling wave tube experimental study of 140GHz first, which uses two-stage and concentrate decaying
The high frequency interacting formations of truncation cut off spurious mode backward wave oscillation circuit, heat survey the result shows that, the pipe is in center frequency points
Place has obtained the stable output of 820W and the three dB bandwidth of 1.5GHz (is detailed in " A Novel Wideband 140GHz Gyrotron
Amplifier ", author: Colin D.Joye et al., 2008).Domestic China Engineering Physics Research Institute also works to 140GHz
In HE06The confocal waveguide gyrotron traveling wave tube of mould is studied and has been designed, and inhales wave by coating on outer sleeve lining in design
Material coating (as shown in Fig. 2) come absorb diffraction go out electromagnetic wave, prevent spurious mode to be reflected back interacting formations, but its is right
The electro-magnetic wave absorption that diffraction goes out is incomplete, and delivery efficiency is not high.
Summary of the invention
Aiming at the problem that in the presence of background technique, the invention proposes a kind of confocal waveguide ceramics open annular column microwaves
Absorption plant, which absorbs the energy given off from high frequency interacting formations using ceramic open annular column, and spreads out
The microwave of injection can multiple roundtrip and absorption in circular column cavity, compared to rectangle outer sleeve coated media inhale wave material
Material, the structure can more preferably inhibit backward wave oscillation, can also prevent hot-spot, largely solve high frequency interacting system
Heat dissipation problem, improve the stability of confocal waveguide gyrotron traveling wave tube.In addition, in same space volume, due to split ring
Shape column has bigger inner surface area, and the surface area for absorbing radiated electromagnetic wave is bigger, higher to microwave absorption efficiency, improves
Confocal waveguide gyrotron traveling wave tube mean power capacity and stability.
The present invention takes technical solution below to realize:
A kind of confocal waveguide ceramics open annular column microwave absorbing device, the confocal waveguide of opening including setting symmetrical above and below
Mirror surface, its both ends extended segment be respectively input/output terminal and the open annular column for being symmetrically disposed on its two sides, feature exists
In: the central axes of the open annular column are located at except confocal waveguide mirror surface interaction region；The opening width of open annular column is big
Opening width in confocal waveguide mirror surface two sides, longitudinal length are greater than or equal to input terminal, confocal waveguide mirror surface and output end
The sum of longitudinal length.
Further, the material of the open annular column is high loss ceramics, such as the ceramics that SIC, PN are heat-resist.
Further, when the open annular column is open circles annulated column, microwave absorption effect is preferable.
Out of confocal wave-guide cavity wave diffraction go out electromagnetic wave can multiple roundtrip and absorption in open annular column cavity,
Absorption efficiency is high, effectively prevents the microwave secondary reflection that diffraction goes out and returns in high frequency interacting formations, improves pipe and stablizes
Property.In addition, open annular rod structure has bigger microwave absorption area compared to rectangular configuration, and to the multiple reflections of electromagnetic wave
Absorbing can be to avoid ceramic ring hot-spot, thus has higher mean power capacity.
Detailed description of the invention
Attached drawing 1 is confocal waveguide ceramics open annular column microwave absorbing device tomograph provided by the invention.
Attached drawing 2 is the rectangle outer sleeve inner surface coated media absorbing material cross-sectional structure figure that background technique provides.
Attached drawing 3 is confocal waveguide ceramics open annular column microwave absorbing device cross-sectional structure figure provided by the invention.
Drawing reference numeral explanation: 1 indicates open confocal waveguide mirror surface；2 indicate ceramic open annular column；3 indicate input terminal；4
Indicate output end；5 indicate confocal waveguide mirror surface；6 indicate absorbing material coating；7 indicate confocal waveguide metal outer sleeve.
Specific embodiment
Below in conjunction with the HE of W-waveband04The confocal waveguide gyrotron traveling wave tube high frequency interacting system design example of mould and attached drawing
The present invention is further elaborated:
The confocal waveguide gyrotron traveling wave tube microwave absorbing device main structure parameters of table 1
| Input terminal | Open confocal waveguide mirror surface | Ceramic open annular column | Output end | |
| Radius of curvature (mm) | 7 | 7 | 5.5 | 7 |
| Transverse width (mm) | 6 | 6 | — | 6 |
| Longitudinal length (mm) | 15 | 143 | 173 | 15 |
| Both-side opening spacing (mm) | 5 | 5 | 5.5 | 5 |
| Thickness | — | — | 1.5 | — |
Attached drawing 1 is confocal waveguide ceramics open annular column microwave absorbing device tomograph, in the confocal waveguide mirror of opening
Face, that is, high frequency interacting formations two sides are arranged ceramic open annular column (2), the longitudinal length of ceramic open annular column be greater than or
Equal to the sum of input terminal (3), confocal waveguide mirror surface and longitudinal length of output end (4), the electromagnetic wave that can go out to diffraction is multiple
Reflection-absorption prevents secondary counter to be emitted back towards high frequency interacting formations, improves travelling-wave tubes job stability.
Attached drawing 2 is the rectangle outer sleeve inner surface coated media absorbing material cross-sectional structure figure that background technique provides, it
Using the metal-coating cylinder of rectangle, for the electromagnetic wave of perpendicular media surface incidence after absorbing material absorbs, what is do not fully absorbed is micro-
Wave can be directly reflected into high frequency interaction region, and the schematic diagram of microwave reflection is given in figure.Attached drawing 3 is provided by the invention total
The energy of burnt waveguide ceramics open annular column microwave absorbing device cross-sectional structure figure, diffraction can be in ceramic open annular rod structure
Middle multiple reflections are repeatedly absorbed, and avoid reflection of electromagnetic wave returning high frequency interacting system, also avoid hot-spot, and one
Determine the heat dissipation problem for solving high frequency interacting system in degree.The schematic diagram of microwave reflection is given in figure, it is only few
Energy can be reflected back interaction region, and due to the cambered design of ceramic open annular column, have bigger absorption area, improve
Travelling-wave tubes mean power capacity and stability.
Claims (3)
1. a kind of confocal waveguide ceramics open annular column microwave absorbing device, the confocal waveguide mirror of opening including setting symmetrical above and below
Face, its both ends extended segment be respectively input/output terminal and be symmetrically disposed on confocal waveguide mirror surface and input/output terminal two sides
Open annular column, it is characterised in that: the central axes of two open annular columns are respectively positioned on confocal waveguide mirror surface interaction region
Except；The opening width of open annular column is greater than the opening width of confocal waveguide mirror surface two sides, the longitudinal length of open annular column
More than or equal to the sum of input terminal, confocal waveguide mirror surface and longitudinal length of output end.
2. a kind of confocal waveguide ceramics open annular column microwave absorbing device as described in claim 1, it is characterised in that: described
The material of open annular column is high loss ceramics.
3. a kind of confocal waveguide ceramics open annular column microwave absorbing device as described in claim 1, it is characterised in that: described
Open annular column is open circles annulated column.
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| CN201710467954.7A CN107275173B (en) | 2017-06-20 | 2017-06-20 | Confocal waveguide ceramics open annular column microwave absorbing device |
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| CN201710467954.7A CN107275173B (en) | 2017-06-20 | 2017-06-20 | Confocal waveguide ceramics open annular column microwave absorbing device |
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| CN107275173B true CN107275173B (en) | 2019-02-15 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112908810B (en) * | 2021-02-08 | 2022-01-25 | 电子科技大学 | High-frequency circuit of wedge-shaped confocal waveguide cyclotron device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2688342A1 (en) * | 1992-03-06 | 1993-09-10 | Thomson Tubes Electroniques | Microwave electron tube |
| CN105914117A (en) * | 2016-04-20 | 2016-08-31 | 电子科技大学 | Confocal waveguide broadband input coupling device |
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2017
- 2017-06-20 CN CN201710467954.7A patent/CN107275173B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2688342A1 (en) * | 1992-03-06 | 1993-09-10 | Thomson Tubes Electroniques | Microwave electron tube |
| CN105914117A (en) * | 2016-04-20 | 2016-08-31 | 电子科技大学 | Confocal waveguide broadband input coupling device |
Non-Patent Citations (2)
| Title |
|---|
| 0.14THZ共焦波导回旋行波管研究;胡鹏;《中国博士学位论文全文数据库 信息科技辑》;20140215;第22页 * |
| A TE13 Mode Converter for High-Order Mode Gyrotron-Traveling-Wave Tubes;Guo Liu et al.;《IEEE TRANSACTIONS ON ELECTRON DEVICES》;20160131;第486-490页 * |
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