CN110165348B - High-power millimeter wave TE01Mode filter - Google Patents
High-power millimeter wave TE01Mode filter Download PDFInfo
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- CN110165348B CN110165348B CN201910211219.9A CN201910211219A CN110165348B CN 110165348 B CN110165348 B CN 110165348B CN 201910211219 A CN201910211219 A CN 201910211219A CN 110165348 B CN110165348 B CN 110165348B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
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Abstract
The invention discloses a high-power millimeter wave TE02A mode filter belongs to the technical field of high-power millimeter wave transmission. The filter comprises a mode filtering section, and an input transition section which are symmetrically arranged at two ends of the mode filtering sectionA transition section is formed; the input/output transition section connects the circular waveguide and the mode filtering section to realize TE in the circular waveguide0nquasi-TE in mode and quasi-circular waveguide0nConverting a mould; the mode filtering section comprises a main waveguide and four wave absorption cavities uniformly arranged on the periphery of the main waveguide; the main waveguide is communicated with the wave-absorbing cavity through four strip-shaped radiation holes which are axially arranged. The filter adopts a waveguide structure based on an overmode, has large power capacity, and can carry out TE within a wide frequency band range02Modulo implementation of filtering, for TE11、TM11、TE21The die also has a certain filtering effect without affecting TE01Propagation of the mode. Meanwhile, the filter has the advantages of simple structure, easy processing and simple and convenient assembly.
Description
Technical Field
The invention belongs to the technical field of high-power millimeter wave transmission, and particularly relates to a TE (time TE) transmission link for a high-power millimeter wave transmission link01A filter of modes.
Background
The gyrotron traveling wave tube has the characteristics of high gain, wide frequency band, high power and the like, is a unique broadband power source capable of realizing high-power output in a millimeter wave band, and has a very wide application prospect in the fields of imaging radars, millimeter wave communication systems, electronic countermeasure, microwave weapons and the like. Circular waveguide TE01The modes are distributed in a ring shape, have the characteristics that the energy is concentrated in the center of the waveguide and the fringe field is weak, and are common working modes of the gyrotron traveling wave tube. In order to avoid power breakdown and reduce transmission loss, an over-mode circular waveguide structure is adopted for a high-power transmission line for realizing butt joint of the gyrotron traveling wave tube and the antenna. On transmission lines, the use of functional devices based on over-mode waveguides can excite parasitic modes. Transition waveguides, angled bends, etc. will transform the TE due to radial changes in the waveguide01Conversion of the mould part into TE02Mold, TE03A mode of high order; the presence of the mode converter generates TE11Mode, TM11Mold, TE21And a mode and the like are non-working modes. The presence of these parasitic modes can have a number of undesirable effects on the system. For TE02Mold, TE03For the high order mode such as mode, the high power transmission line is not uniform due to the presence of the tapered waveguide, so that it is cut off, thereby forming local resonance. Resonance can cause a sharp increase in local field strength, causing air breakdown, and disrupting system operation. Meanwhile, total reflection can be formed during breakdown, so that the generated energy is reflected back to the power source, and the power source is easily damaged. For TE11Mode, TM11Mold, TE21For the mode equal low-order mode, in the process of forward propagation along a high-power transmission line, on one hand, the field intensity is enhanced due to the phase transformation relationship, and the threshold value of the transmission power capacity is reduced; on the other hand, the feed source of the corrugated slot waveguide structure is easy to break down due to the edge field intensity, thereby affecting the normal operation of the system. In order to ensure stable operation of the high-power millimeter wave system, the generated non-operating modes must be filtered. Therefore, the non-operating mode filter is especially necessary for realizing high-power millimeter wave system application.
Relatively circular waveguide TE11Mode, TM11Mold, TE21In a different mode, TE02The field distribution of the mode is distributed in a circular ring shape, and the mode cannot be effectively filtered by a filter based on a corrugated groove structure. To filter out TE02While the mould is in operation mode TE01Efficient transmission of modes, the TE, must be over-mode circular waveguide01The mode filter was studied. Koichi Inada and Sakura in Japan designed a circular-arc polygonal waveguide (No.3,916,355, United States patent). The waveguide can not affect TE01While molding, the TE is added01TE outside of the mould0nTE with mode conversion to other higher ordersmnMode(s). The waveguide and the subsequent spiral waveguide can form a TE01A modular filtering system. However, the filter formed by combining two waveguides with different shapes and a transition section at the junction has a larger size, and the filter is suitable for TE in the frequency band below 60GHz02The filtering effect of the mode is poor. After that time, the user can select the desired position,k.hashimoto, s.shimada and m.koyama of yokokuka Electrical Communication Laboratory in japan changed Circular waveguides into a set of asymmetric semicircular waveguides (Circular TE waveguides) by introducing a dielectric insert sheet structure into the waveguidesOnModel Filters For A Guided Millimeters Transmission). Annularly distributed high order mode TE0nThe mode (n is more than or equal to 2) is split into corresponding modes in a pair of semicircular waveguides after entering the device. Due to the asymmetry of the upper and lower semicircular waveguides, the propagation phases are inconsistent, and the mode phases in the semicircular waveguide at the output end are different by 180 degrees, so that the mode phases are synthesized at the tail end of the device during superposition to achieve the filtering effect. The filter can effectively filter TE0n(n is more than or equal to 2) mode, but the complex structure with embedded medium and asymmetric multiple sections brings great processing difficulty to processing. Meanwhile, the filter can only work in a high frequency band above 40 GHz. In low frequency operation, more combined modes appear at the filter output instead due to the change in the magnitude of the phase shift.
Disclosure of Invention
Aiming at the problems of complex structure, poor filtering performance and the like of the existing mode filter, the invention provides a high-power millimeter wave circular waveguide TE01A technical scheme of a mode filter.
The technical scheme adopted by the invention is as follows:
high-power millimeter wave circular waveguide TE01The mode filter comprises a mode filtering section, an input transition section and an output transition section, wherein the input transition section and the output transition section are symmetrically arranged at two ends of the mode filtering section.
The input/output transition section connects the circular waveguide and the mode filtering section, and the change mode can be linear transition or nonlinear transition, so as to realize TE in the circular waveguide0nquasi-TE in mode and quasi-circular waveguide0nEfficient conversion of the modes.
The mode filtering section comprises a main waveguide and four wave absorption cavities uniformly arranged on the periphery of the main waveguide. The inner cross section of the main waveguide is a circular waveguide, and the main waveguide is communicated with the wave-absorbing cavity through four strip-shaped radiation holes which are axially arranged. The quasi-circular waveguide is a circular waveguide with four symmetrical bulges obtained after equal disturbance is applied to the angular direction of the circular waveguide.
The four strip-shaped radiation holes are respectively positioned at the concave positions of the inner wall of the main waveguide. The two ends of the strip-shaped radiation hole can be semicircular, semi-elliptical or wedge-shaped, and the purpose is to reduce the influence caused by the structural mutation caused by the hole opening on the main waveguide wall. In order to ensure sufficient mechanical strength, the thickness of the band-shaped radiation hole needs to be more than 0.5 mm.
The wave absorption cavity is a cylindrical cavity structure with an opening on the side surface. The outside of the cavity is a high-loss dielectric material layer (epsilon)r>9) And the outer side of the high-loss dielectric material layer is a waveguide wall. The length of the wave-absorbing cavity is greater than the length of the strip-shaped radiation hole by four wavelengths. The length of the waveguide wall is consistent with that of the wave absorption cavity, and the width of the waveguide wall is more than 2 times larger than that of the strip-shaped radiation hole, so that the radiated electromagnetic energy is effectively absorbed. In order to facilitate fixing, the connection surface of the wave absorption cavity and the main waveguide is a plane. TE radiating from strip-shaped radiating holes02After multiple reflections of the mode on the high-loss dielectric material, the mode is finally completely absorbed.
The waveguide wall material is metal and is provided with a heat dissipation device so as to reduce the temperature rise caused by the absorption of a parasitic mode by the attenuation material.
The input transition section and the output transition section are respectively connected with the front end circular waveguide and the rear end circular waveguide through concave-convex flanges.
The material of the input transition section and the output transition section is aluminum material or copper material, and the material of the mode filtering section is copper material.
TE of the invention01The mode filter has the following working principle:
a circular waveguide mode input from the front end is converted into a main waveguide middle mode in a mode filtering section after being transited through an input transition section. In the mode filtering section, because the working mode and the parasitic mode have different field distributions, the strip-shaped radiation hole can effectively cut off TE02Surface current of mode and other parasitic modes realizes external radiation without influencing TE01Propagation of the mode. To TE11、TM11、TE21Mode-equal low-order modes, quasi-circular waveguide TE02Closer to the cutoff, which makes it easier to radiate out. The radiated electromagnetic energy irradiates into the wave absorption cavity at a certain deflection angleAnd then, the high-loss attenuation medium surface is completely absorbed through multiple back and forth reflections. For the operating mode TE01In terms of a mode, the position of the strip-shaped radiation hole is a weak field intensity area, and the strip-shaped radiation hole has no influence on forward propagation of the strip-shaped radiation hole. Therefore, TE in the main waveguide after the mode filtering section01After entering the output transition section, the mode is converted into a circular waveguide TE01And (5) molding. After the mixed mode at the input end passes through the mode filtering section, the non-working mode is effectively absorbed, so that the wave beam at the output port of the filter only has the working mode, and the transmission purity of the wave beam is guaranteed.
The invention has the following advantages:
1. the filter adopts a waveguide structure based on an overmode, has large power capacity, and can carry out TE within a wide frequency band range02Modulo implementation of filtering without affecting TE01Propagation of the mode.
2. The filter of the invention can effectively filter TE02For TE, in addition to mode-height mode11、TM11、TE21The die also has a certain filtering effect and a wide application range.
3. The filter has a closed waveguide structure, has a good electromagnetic shielding effect, and does not influence the surrounding environment.
4. The filter has simple structure, easy processing and simple and convenient assembly.
Drawings
FIG. 1 shows a high power millimeter wave TE of the present invention01A cross-sectional view of a mode filter; wherein 1 and 3 are transition sections, 2 is a mode filtering section, and 4 is a band-shaped radiation hole.
FIG. 2 is a high power millimeter wave TE of the present invention01A front view of a mode-filtered section of the mode filter; wherein 5 is a high-loss dielectric material layer, 6 is a waveguide wall, and 7 is a main waveguide.
Fig. 3 is a schematic view of the connection of the band-shaped radiation holes and the high-loss dielectric material layer.
FIG. 4 shows TE01Die and TE02The transmission characteristics of the mode.
FIG. 5 shows TE01Die and TE02The standing wave characteristics of the mode.
Detailed Description
The following description will be given by way of example in conjunction with the above theoretical basis and design point.
As shown in FIG. 1, TE of the present embodiment01The mode filter works in a Ka frequency band and comprises three parts: the mode filtering section 2 is symmetrically arranged at the input transition section 1 and the output transition section 3 at two ends of the mode filtering section.
The input and output interfaces of the filter are circular waveguides, and the caliber of the filter is 32 mm. The input and output transition section is connected with the mode filtering section in a linear transition mode, and the length of the transition section is 180 mm. The overall filter length is 500 mm. The mode filtering section comprises a main waveguide and four wave absorption cavities uniformly arranged on the periphery of the main waveguide. The inner cross section of the main waveguide is a circular waveguide, and the main waveguide is communicated with the wave-absorbing cavity through four strip-shaped radiation holes 4 which are axially arranged. The quasi-circular waveguide is a circular waveguide with four symmetrical bulges obtained after equal disturbance is applied to the angular direction of the circular waveguide. The strip-shaped radiation hole 4 is positioned in the center of the main waveguide recess, and two ends of the strip-shaped radiation hole are in transition by adopting a semicircular structure so as to reduce the influence of the strip-shaped radiation hole on the waveguide. The high-loss dielectric material layer 5 outside the wave-absorbing cavity is beryllium oxide, the outer radius of the high-loss dielectric material layer is 8.5mm, the inner radius of the high-loss dielectric material layer is 6.8mm, and the length of the high-loss dielectric material layer is 120 mm. And the metal waveguide wall 6 is arranged on the outer side of the high-loss dielectric material layer 5 and plays a role in structural support and heat dissipation. The outer side of the metal waveguide wall is provided with a water cooling structure which is connected with the outside through a port 8. After the wave beam enters the filter from the input port through the input transition section 1, the non-working mode TE02The die will radiate out of the transmission link through the strip-shaped radiation holes 4 and be absorbed by the arranged high-loss dielectric material layer 5; operating mode TE01The mode is not influenced by the strip-shaped radiation hole 4 and is efficiently transmitted forwards. The wave beam output from the mode filtering section 2 passes through the output transition section 3 and then is output. The whole mode filter is connected with other transmission devices through the concave-convex flange.
Fig. 4 shows the mode filter TE01、TE02The voltage transmission coefficient curves of the two modes are shown in fig. 5. As can be seen, TE is present in the device01The voltage transmission coefficient of the mode is more than-0.1 dB, the voltage reflection coefficient is less than-40 dB, and the realization is thatThe transmission is efficient and low-loss under the condition of low reflection; and TE02The voltage transmission coefficient of the mode is less than-20 dB in most Ka frequency bands, and the reflection coefficient is also less than-20 dB, which shows that TE02The modes have mostly been radiated out of the link through the radiation slits. It can thus be concluded that the designed filter exhibits good filtering properties.
The above example is processed and manufactured to be applied to a convoluted traveling wave pipe system to effectively transfer TE generated on a transmission link02The mode is filtered, the power breakdown phenomenon is avoided, and the stable work of the high-power millimeter wave system is ensured.
The above examples are merely for convenience of illustration of the present invention, and the present invention is also applicable to the over-mode circular waveguide TE of other frequency bands01Any other changes, modifications, substitutions, combinations, and simplifications in the mode filter which do not depart from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. High-power millimeter wave circular waveguide TE01The mode filter comprises a mode filtering section and input/output transition sections symmetrically arranged at two ends of the mode filtering section;
the input/output interface of the filter is a circular waveguide, the input/output transition section connects the circular waveguide with the mode filtering section, the input/output transition section is respectively connected with the front and the rear circular waveguides to realize TE in the circular waveguide0nquasi-TE in mode and quasi-circular waveguide0nConverting a mould;
the mode filtering section comprises a main waveguide and four wave absorption cavities uniformly arranged on the periphery of the main waveguide; the main waveguide is a quasi-circular waveguide, and the inner cross section of the main waveguide is a quasi-circular waveguide; the main waveguide is communicated with the wave-absorbing cavity through four strip-shaped radiation holes which are axially arranged; the quasi-circular waveguide is a circular waveguide with four symmetrical bulges obtained after equal disturbance is applied to the circular waveguide at an angular direction; the four strip-shaped radiation holes are respectively positioned at the concave positions of the inner wall of the main waveguide;
the wave absorption cavity is of a cylindrical cavity structure with an opening on the side surface;the outside of the cavity is a high-loss dielectric material layer with a dielectric constant epsilonr>9, a waveguide wall is arranged on the outer side of the high-loss dielectric material layer; the wave-absorbing cavity is longer than the strip-shaped radiation hole by four wavelengths, the length of the wave-absorbing wall is consistent with that of the wave-absorbing cavity, and the width of the wave-absorbing wall is 2 times larger than that of the strip-shaped radiation hole.
2. The high-power millimeter wave circular waveguide TE of claim 101A mode filter, characterized by: the input/output transition section changes in a linear transition mode or a nonlinear transition mode.
3. The high-power millimeter wave circular waveguide TE of claim 101A mode filter, characterized by: and the connection surface of the wave absorption cavity and the main waveguide is a plane.
4. The high-power millimeter wave circular waveguide TE of claim 101A mode filter, characterized by: the two ends of the strip-shaped radiation hole are in a semicircular shape, a semi-elliptical shape or a wedge shape, and the thickness of the strip-shaped radiation hole is larger than 0.5 mm.
5. The high-power millimeter wave circular waveguide TE of claim 101A mode filter, characterized by: the waveguide wall material is metal, and a water-cooling heat dissipation device is arranged on the outer side of the waveguide wall material.
6. The high-power millimeter wave circular waveguide TE of claim 101A mode filter, characterized by: the input/output transition section is respectively connected with the front end circular waveguide and the rear end circular waveguide through concave-convex flanges.
7. The high-power millimeter wave circular waveguide TE of claim 501A mode filter, characterized by: the input/output transition section is made of aluminum or copper, and the mode filtering section is made of copper.
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| CN201910211219.9A CN110165348B (en) | 2019-03-20 | 2019-03-20 | High-power millimeter wave TE01Mode filter |
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| CN201910211219.9A CN110165348B (en) | 2019-03-20 | 2019-03-20 | High-power millimeter wave TE01Mode filter |
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| CN110165348B true CN110165348B (en) | 2021-06-01 |
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| CN104466339A (en) * | 2013-09-13 | 2015-03-25 | 东光株式会社 | Dielectric waveguide resonator and dielectric waveguide filter using the same |
| CN105759362A (en) * | 2016-05-13 | 2016-07-13 | 龙岩学院 | Band-pass and band-stop filter based on anti-symmetric multimode Bragg light guide grating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5399999A (en) * | 1993-02-08 | 1995-03-21 | Hughes Aircraft Company | Wideband TM01 -to-TE11 circular waveguide mode convertor |
| JP3688558B2 (en) * | 2000-06-05 | 2005-08-31 | 三菱電機株式会社 | Waveguide group duplexer |
| WO2014174494A2 (en) * | 2013-04-26 | 2014-10-30 | Swissto12 Sa | Flanges for connection between corrugated wave-guiding modules |
| US10228512B2 (en) * | 2016-09-29 | 2019-03-12 | Oki Electric Industry Co., Ltd. | Wavelength filter |
| CN107516751A (en) * | 2017-08-30 | 2017-12-26 | 电子科技大学 | A kind of broadband high-power millimeter wave TE0,1 mould overmoded waveguide elbows |
| CN107611528B (en) * | 2017-09-19 | 2020-03-31 | 电子科技大学 | Double-frequency high-power over-mode waveguide elbow |
| CN107863593B (en) * | 2017-09-26 | 2019-12-06 | 西北核技术研究所 | Circular waveguide mode suppressor for suppressing TE11 mode microwave and design method thereof |
| CN107919515B (en) * | 2017-11-20 | 2019-10-18 | 中国工程物理研究院电子工程研究所 | A kind of high-field mode filter for only depositing TE0n mode |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104466339A (en) * | 2013-09-13 | 2015-03-25 | 东光株式会社 | Dielectric waveguide resonator and dielectric waveguide filter using the same |
| CN105759362A (en) * | 2016-05-13 | 2016-07-13 | 龙岩学院 | Band-pass and band-stop filter based on anti-symmetric multimode Bragg light guide grating |
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