CN110165348A - A kind of high-power millimeter wave TE02Mode filter - Google Patents
A kind of high-power millimeter wave TE02Mode filter Download PDFInfo
- Publication number
- CN110165348A CN110165348A CN201910211219.9A CN201910211219A CN110165348A CN 110165348 A CN110165348 A CN 110165348A CN 201910211219 A CN201910211219 A CN 201910211219A CN 110165348 A CN110165348 A CN 110165348A
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- mould
- waveguide
- mode
- circular waveguide
- wave
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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 kind of high-power millimeter wave TE02Mode filter belongs to high-power millimeter wave transmission technique field.The filter includes that mode filters out section and is symmetrically disposed on the input transition section at its both ends, output changeover portion；Circular waveguide and mode are filtered out section and are connected with each other by input/output changeover portion, realize TE in circular waveguide0nQuasi- TE in mould and class circular waveguide0nThe conversion of mould；It includes main waveguide and four suction wave chambers that its periphery is uniformly arranged that mode, which filters out section,；It is connected to respectively by four axially disposed band-like radiating apertures between main waveguide and suction wave chamber.Filter of the present invention is used based on the waveguiding structure for crossing mould, and power capacity is big, and can be in broad frequency range to TE02Mould realizes filtering, for TE11、TM11、TE21Mould also have the effect of filtering out it is certain, without influence TE01The propagation of mould.Meanwhile filter construction of the present invention is simple, it is easy to process, assembly is easy.
Description
Technical field
The invention belongs to high-power millimeter wave transmission technique fields, and in particular to one kind is transmitted for high-power millimeter wave
Link TE02The filter of mould.
Background technique
Gyrotron traveling wave tube has the characteristics that high-gain, broadband and high power, is that millimeter wave band is uniquely able to achieve big function
The broadband power source of rate output, has non-in the fields such as imaging radar, millimeter-wave communication system and electronic countermeasure, microwave weapon
Often wide application prospect.Circular waveguide TE01Mould is annularly distributed, and there is energy to concentrate on the weaker spy of waveguide core, fringing field
Point is the common operating mode of gyrotron traveling wave tube.In order to avoid power disruption occurs and reduces transmission loss, convolution row is realized
The high power transmission line that wave duct is docked with antenna need to use mould Circular waveguides.On the transmission line, based on the function of overmoded waveguide
The use of energy device can motivate spurious mode.Transition waceguide, oblique angle elbow etc., can be by TE due to the variation of waveguide radial direction01Mould
Part is converted into TE02Mould, TE03The higher order modes such as mould；And the presence of mode converter can then generate TE11Mould, TM11Mould, TE21Mould
Equal non-operating modes.The presence of these spurious modes can bring a series of undesirable influences to system.For TE02Mould, TE03Mould
For equal higher order modes, since the presence meeting of tapered waveguide is so that high power transmission line is uneven, so that it is ended, thus
Form particular resonance.Resonance can to increase suddenly in local field strength, and air breakdown occurs, and destroy system work.Meeting when puncturing simultaneously
Total reflection is formed, the energy generated is caused to reflect back into power source, is easy damage power source.For TE11Mould, TM11Mould, TE21
For the low step modes such as mould, during being propagated forward along high power transmission line, on the one hand due to the relationship of phse conversion
Meeting reduces the threshold value of transimission power capacity so that field strength is enhanced；On the other hand since the reason of cell-edge can make wave
The feed of groove waveguiding structure is easy to happen breakdown, to influence the normal work of system.In order to ensure high-power millimeter wave system
System steady operation, it is necessary to filter out these non-operating modes of generation.Therefore, non-operating mode filter is high-power for realizing
Millimeter-wave systems are using particularly necessary.
Compared with circular waveguide TE11Mould, TM11Mould, TE21Unlike mould, TE02The field distribution of mould distribution annular in shape, cannot be by
Filter based on flute constructions effectively filters out.In order to filter out TE02While mould, the height of operating mode TE01 mould is realized
Effect transmission, it is necessary to mould circular waveguide TE excessively02Mode filter is studied.The Koichi Inada and Sakura of Japan are devised
A kind of polygon of circular arch waveguide (No.3,916,355, United States patent).This waveguide can not influence TE01Mould
While, by TE01TE other than mould0nMould is transformed into the TE of other high ordersmnMode.This waveguide and the helix waveguide being followed by are just
A TE can be formed0nMould filtering system.But this combined by two waveguides of different shapes plus junction transition and
At filter undoubtedly there is biggish size, and this filter in 60GHz frequency range below to TE02The filtering of mould is imitated
Fruit is poor.Hereafter, the K.Hashimoto of Japanese Yokosuka Electrical Communication Laboratory,
S. circular waveguide is turned into one group asymmetric half by introducing medium plate-inserting structure in the waveguide by Shimada and M.Koyama
Circular waveguide (Circular TEOnMode Filters For A Guided Millimeters Transmission).It is cyclic annular
The higher order mode TE of distribution0nAfter (n >=2) mould enters device, the associative mode that can be split into a pair of half circular waveguide.Due to
The asymmetry of upper lower half circle waveguide, so that propagation phase is inconsistent, the modal phase difference in half circular waveguide of output end
180 °, thus when being superimposed and device end by synthesis to reaching filter effect.Although this filter can be filtered effectively
Except TE0n(n >=2) mould, but medium is embedded, the asymmetric labyrinth of multistage to processing brings great difficulty of processing.Together
When, this filter can only operate in the high band of 40GHz or more.In low-frequency range work, due to the change of phase shift size,
It will appear more integrated modes instead in filter output.
Summary of the invention
For the problems such as present mode filter construction is complicated, filtering performance is poor, the present invention proposes a kind of high-power milli
Metric wave circular waveguide TE02Mode filter technical solution.
The technical solution adopted by the invention is as follows:
A kind of high-power millimeter wave circular waveguide TE02Mode filter filters out section including mode and is symmetrically disposed on its both ends
Input transition section, output changeover portion.
Circular waveguide and mode are filtered out section and are connected with each other by the input/output changeover portion, and variation pattern can be linear
Transition, or TE in circular waveguide is realized in non-linear transition0nQuasi- TE in mould and class circular waveguide0nThe efficient conversion of mould.
It includes main waveguide and four suction wave chambers that its periphery is uniformly arranged that the mode, which filters out section,.Wherein, the main waveguide
Interior cross section is class circular waveguide, is connected to respectively by four axially disposed band-like radiating apertures between main waveguide and suction wave chamber.
The class circular waveguide is after circular waveguide angularly applies impartial disturbance, and there are four the circular waveguides of symmetrical protrusion for acquired band.
The four band-like radiating aperture is located at the recess of main waveguide inner wall.The band-like radiating aperture both ends can be with
For semicircle, half elliptic or wedge shape, it is therefore an objective to reduce on main wave guide wall caused by structural mutation brought by aperture
It influences.In order to ensure enough mechanical strengths, the thickness of band-like radiating aperture need to be greater than 0.5mm.
It is described to inhale the circular cylindrical cavity structure that wave chamber is side opening.Layer of dielectric material (ε is damaged on the outside of cavity to be one layer highr
It > 9) is, wave guide wall on the outside of high damage layer of dielectric material.It inhales wave cavity length and is greater than band-like four wavelength of radiation hole length.The waveguide
Wall length is greater than band-like radiation hole width 2 times or more with the consistent of wave chamber, width is inhaled, to realize to the electromagnetic energy radiated
Amount effectively absorbs.In order to facilitate fixation, the joint face for inhaling wave chamber and main waveguide is plane.It is given off from band-like radiating aperture
TE02Mould after multiple reflections, is finally completely absorbed on high damage dielectric material.
The waveguide wall material is metal, is provided with radiator, is absorbed caused by spurious mode with reducing attenuating material
Temperature rise.
The input transition section, output changeover portion pass through concave-convex flange respectively and connect with front and back ends circular waveguide.
The input transition section, output changeover portion material are aluminium or copper material, and it is copper material that mode, which filters out section material,.
The TE of invention02Mode filter working principle is as follows:
For the circular waveguide mode inputted from front end after input transition section transition, the mode of being converted into filters out Duan Zhongzhu waveguide
Middle mode.Section is filtered out in mode, since operating mode and spurious mode field distribution are different, band-like radiating aperture is had
Effect cutting TE02The surface current of the spurious modes such as mould is realized to external radiation, without influencing TE01The propagation of mould.Compared with TE11、TM11、
TE21For the low step modes such as mould, class circular waveguide TE02Closer to cut-off, this makes it be easier to radiate.The electricity given off
After magnetic energy is irradiated into suction wave chamber with certain drift angle, inhaled completely on high damage attenuation medium surface by multiple roundtrip
It receives.For operating mode TE01For mould, band-like radiating aperture present position is the strong area of feeble field, and band-like radiating aperture propagates forward it
Do not influence.Therefore, after mode filters out section, TE in main waveguide01After mould enters output changeover portion, it is converted into circular waveguide
TE01Mould.Since the mixed mode of input terminal is after mode filters out section, non-operating mode is effectively absorbed, so filter
The wave beam of output port there was only operating mode, ensure the transmission purity of wave beam.
Present invention has the advantage that
1. filter of the present invention is used based on the waveguiding structure for crossing mould, power capacity is big, and can be right in broad frequency range
TE02Mould realizes filtering, without influencing TE01The propagation of mould.
2. filter of the present invention is in addition to that can effectively filter out TE02Outside the higher order modes such as mould, for TE11、TM11、TE21Mould also has
Have and filters out certain effect, it is applied widely.
3. filter of the present invention is closed waveguiding structure, there is good effectiveness, will not influence ring around
Border.
4. filter construction of the present invention is simple, easy to process, assembly simplicity.
Detailed description of the invention
Fig. 1 is high-power millimeter wave TE of the invention02The sectional view of mode filter；Wherein 1,3 be changeover portion, and 2 be mode
Section is filtered out, 4 be band-like radiating aperture.
Fig. 2 is high-power millimeter wave TE of the invention02The mode of mode filter filters out the front view of section；Wherein 5 be high damage
Layer of dielectric material, 6 be wave guide wall, and 7 be main waveguide.
Fig. 3 is the connection schematic diagram of band-like radiating aperture and high damage layer of dielectric material.
Fig. 4 is TE01Mould and TE02The transmission characteristic of mould.
Fig. 5 is TE01Mould and TE02The stationary wave characteristic of mould.
Specific embodiment
It is illustrated below with reference to above-mentioned theory basis and designing points citing.
As shown in Fig. 1, the TE of the present embodiment02Mode filter works in Ka frequency range, including three parts: mode filters out
Section 2 is symmetrically disposed on the input transition section 1 and output changeover portion 3 at its both ends.
Filter input/output interface is circular waveguide, bore 32mm.Input and output changeover portion and mode filter out section use
The mode of linear transitions is attached, transition section length 180mm.Entire filter length is 500 mm.Mode filters out section packet
Include four suction wave chambers that main waveguide and its periphery are uniformly arranged.Wherein, cross section is class circular waveguide, main wave in the main waveguide
It leads and inhales and be connected to respectively by four axially disposed band-like radiating apertures 4 between wave chamber.The class circular waveguide is in circle wave
Lead angle is to after applying impartial disturbance, and there are four the circular waveguides of symmetrical protrusion for acquired band.It is recessed that band-like radiating aperture 4 is located at main waveguide
Center is fallen into, and both ends use semi-circular structure to carry out transition to reduce influence of the band-like radiating aperture to waveguide.Inhale the height on the outside of wave chamber
Damage layer of dielectric material 5 is beryllium oxide, outer radius 8.5mm, inside radius 6.8mm, length 120mm.High damage dielectric material
5 outside of layer is metal wave guide wall 6, plays structural support and heat dissipation.It is provided with water-cooling structure on the outside of metal wave guide wall, is led to
Interface 8 is crossed to be connected with the external world.Wave beam from input port by input transition section 1 enter filter after, non-operating mode TE02Mould
Transmission link can be given off through band-like radiating aperture 4, the high damage layer of dielectric material 5 being set absorbs；Operating mode TE01Mould is then not
It is influenced by band-like radiating aperture 4, efficient onwards transmission.The wave beam that slave pattern filters out the output of section 2 is external after exporting changeover portion 3
Realize output.Entire mode filter is connected by concave-convex flange with other transmission apparatus.
Fig. 4 gives mode filter TE01、TE02The voltage transmission coefficient curve of both of which, Fig. 5 give the two
Voltage reflection coefficient curve.As seen from the figure, TE in the devices01The voltage transmission coefficient of mould is greater than -0.1dB, voltage reflection system
Number is less than -40dB, realizes and efficiently, low-loss transmits in the case where low reflection；And TE02The voltage transmission coefficient of mould
It is both less than -20dB in most of Ka frequency range, reflection coefficient is similarly less than -20dB, illustrates TE02Mould has largely passed through radiation
Seam radiation outgoing link.Therefore it may be concluded that designed filter is demonstrated by good filtering characteristic.
Examples detailed above is subjected to processing and fabricating, applies to gyrotron traveling wave tube system, effectively to being generated on transmission link
TE02Mode is filtered out, and the generation of power disruption phenomenon is avoided, and ensure that the steady operation of high-power millimeter-wave systems.
Above example is only of the invention novel for convenience of description, the novel mistake that may be equally applicable for other frequency ranges of the present invention
Mould class circular waveguide TE02On mould mode filter, it is other it is any without departing from the spirit and principles of the present invention made by change
Change, modification, substitution, combination, simplification are regarded as equivalent substitute mode, are included within the scope of the present invention.
Claims (7)
1. a kind of high-power millimeter wave circular waveguide TE02Mode filter filters out section including mode and is symmetrically disposed on the defeated of its both ends
Enter changeover portion, output changeover portion；
Circular waveguide and mode are filtered out section and are connected with each other by the input/output changeover portion, realize TE in circular waveguide0nMould and class circle wave
Lead middle quasi- TE0nThe conversion of mould；
It includes main waveguide and four suction wave chambers that its periphery is uniformly arranged that the mode, which filters out section,；Wherein, horizontal in the main waveguide
Section is class circular waveguide, is connected to respectively by four axially disposed band-like radiating apertures between main waveguide and suction wave chamber；It is described
Class circular waveguide is after circular waveguide angularly applies impartial disturbance, and there are four the circular waveguides of symmetrical protrusion for acquired band；Described four
Band-like radiating aperture is located at the recess of main waveguide inner wall；
It is described to inhale the circular cylindrical cavity structure that wave chamber is side opening；Layer of dielectric material, dielectric are damaged on the outside of cavity to be one layer high
Constant εr> 9, high damage layer of dielectric material outside is wave guide wall；The suction wave cavity length is greater than band-like four wavelength of radiation hole length,
Wave guide wall length is consistent with wave chamber is inhaled, and width is greater than band-like 2 times of radiation hole width.
2. a kind of high-power millimeter wave circular waveguide TE as described in claim 102Mode filter, it is characterised in that: the input/
Output its variation pattern of changeover portion is linear transitions, or is non-linear transition.
3. a kind of high-power millimeter wave circular waveguide TE as described in claim 102Mode filter, it is characterised in that: the suction wave
Chamber and the joint face of main waveguide are plane.
4. a kind of high-power millimeter wave circular waveguide TE as described in claim 102Mode filter, it is characterised in that: described band-like
Radiating aperture both ends are semicircle, half elliptic or wedge shape, and the thickness of band-like radiating aperture is greater than 0.5mm.
5. a kind of high-power millimeter wave circular waveguide TE as described in claim 102Mode filter, it is characterised in that: the waveguide
Wall material is metal, and outside is provided with water-cooling heat radiating device.
6. a kind of high-power millimeter wave circular waveguide TE as described in claim 102Mode filter, it is characterised in that: the input
Changeover portion, output changeover portion pass through concave-convex flange respectively and connect with front and back ends circular waveguide.
7. a kind of high-power millimeter wave circular waveguide TE as claimed in claim 502Mode filter, it is characterised in that: the input
Changeover portion, output changeover portion material are aluminium or copper material, and it is copper material that mode, which filters out section material,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211219.9A CN110165348B (en) | 2019-03-20 | 2019-03-20 | High-power millimeter wave TE01Mode filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211219.9A CN110165348B (en) | 2019-03-20 | 2019-03-20 | High-power millimeter wave TE01Mode filter |
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| CN110165348A true CN110165348A (en) | 2019-08-23 |
| CN110165348B CN110165348B (en) | 2021-06-01 |
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| CN201910211219.9A Active CN110165348B (en) | 2019-03-20 | 2019-03-20 | High-power millimeter wave TE01Mode filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115832650A (en) * | 2022-11-30 | 2023-03-21 | 电子科技大学 | High-power microwave low-loss steady-state mode conversion device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115832650A (en) * | 2022-11-30 | 2023-03-21 | 电子科技大学 | High-power microwave low-loss steady-state mode conversion device |
| CN115832650B (en) * | 2022-11-30 | 2024-04-05 | 电子科技大学 | High-power microwave low-loss steady-state mode conversion device |
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| CN110165348B (en) | 2021-06-01 |
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