CN109768354A - A kind of compact circular waveguide TM01Mode excitation device - Google Patents
A kind of compact circular waveguide TM01Mode excitation device Download PDFInfo
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- CN109768354A CN109768354A CN201910168397.8A CN201910168397A CN109768354A CN 109768354 A CN109768354 A CN 109768354A CN 201910168397 A CN201910168397 A CN 201910168397A CN 109768354 A CN109768354 A CN 109768354A
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Abstract
The present invention relates to a kind of compact circular waveguide TM01Mode excitation device, belongs to microwave and millimeter wave technical field, solves compact rectangle TE10Mode-circular waveguide TM01The transfer problem of mode, device include rectangular waveguide, coaxial waveguide, gradation type coaxial waveguide and gradation type circular waveguide interconnected.The present apparatus is with rectangle TE10Wave selects coaxial waveguide as intermediate conversion structure, by TE as input signal10Wave is first converted to TEM coaxial wave and then has motivated TM in circular waveguide01Wave is exported.The present invention using the coaxial transformational structure of stepped rectangle-and Chebyshev's curved shape it is coaxial-circular waveguide transformational structure, effectively promote bandwidth of a device and output purity；Thick same shaft design, significantly improves the stability of device, reduces installation error.
Description
Technical field
The present invention relates to microwave and millimeter wave technical field, especially a kind of compact circular waveguide TM01Mode excitation device.
Background technique
Existing most of high-power microwave source, such as the theory of relativity Qie Lunkefu device, cyclotron maser device, virtual cathode vibration
Device etc. is swung, operating mode is generally circular waveguide symmetric body mould (TE0n、TM0n) or high-order side corner mode (TEmn, m > > 1, n~
1,2).These mode some are not suitable for long distance transmission, and some is not easy to aerial radiation, it is therefore necessary to carry out mode change appropriate
It changes.
Mode exciter belongs to a kind of certain moduli formula converter, is mainly used in the input AD HOC of mode converter
Excitation, to test its performance.It is therefore desirable to which driver translative mode is with high purity, device Insertion Loss is small, working band is wide；In addition,
Processing cost, the structural stability of mode exciter must also pay attention to.The TM of conventional design01Mode converter operation frequency band compared with
Narrow, relative bandwidth only has 10% or so and complicated integral structure, and dielectric support is needed to design, and device size is larger, and exports
Purity is very low.The such as stepped mating structure of improved structure is had been subjected to, although can significantly improve the characteristics such as bandwidth,
On the other hand, in order to reduce device discontinuity to period reflection and transfer efficiency in terms of influence, device it is coaxial in lead
Body selection of dimension is all very small, usually only 1mm, and the inner conductor that can not actually bear the device is important, although emulation
As a result outstanding, practical application is very limited.
Summary of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of compact circular waveguide TM01Mode excitation device is realized compact
Rectangle TE10Mode-circular waveguide TM01The conversion of mode.
The purpose of the present invention is mainly achieved through the following technical solutions:
A kind of compact circular waveguide TM01Mode excitation device, including rectangular waveguide (101), coaxial waveguide (102), gradual change
Type coaxial waveguide (103) and gradation type circular waveguide (104)；
One end of the rectangular waveguide (101) is signal input part, is connect with signal source；The other end is short-circuit face；Institute
The wide face of rectangular waveguide for stating short-circuit face side is equipped with circular opening；
One end of the coaxial waveguide (102) is connect by the way that the circular opening is vertical with the rectangular waveguide (101), separately
One end is connect with the taper end of the gradation type coaxial waveguide (103)；
The butt end of the gradation type coaxial waveguide (103) connects the taper end of the gradation type circular waveguide (104), the gradual change
Output end of the butt end of type circular waveguide (104) as signal；
The rectangular waveguide (101) is internally provided with the stepped impedance matching block connecting with the coaxial waveguide (102)
(105), for carrying out impedance matching to transmission signal.
Further, the short-circuit face of described stepped impedance matching block (105) one end and the rectangular waveguide (101) connects
It connects；It is equipped on the wide face of the stepped impedance matching block (105) coaxial with the circular opening on the wide face of the rectangular waveguide
And the opposite cylinder shape groove in position (107), for being connect with the inner conductor of the coaxial waveguide (102).
Further, the stepped impedance matching block (105) is the metal step impedance matching block of 4 rank increasing lengths.
It further, further include metal ring (106), the metal ring (106) is set to the coaxial waveguide (102)
The junction of inner conductor and stepped impedance matching block (105), it is coaxial with the coaxial waveguide (102) inner conductor.
Further, the broadside of rectangular waveguide (101) input port is having a size of 22.86mm, narrow side having a size of
10.16mm, length are less than 100mm；The circular opening diameter in the wide face of the rectangular waveguide (101) and the coaxial waveguide (102)
Outer conductor diameter it is identical；
The width of the step type impedance matching block (105) is identical as the broadside of the rectangular waveguide (101), internal 4 ranks
Step length is respectively 32.75mm, 43.69mm, 52.58mm, 61.96mm；Height respectively 0.91mm, 2.49mm, 3.01mm,
1.38mm。
Further, the circular opening in the wide face of the rectangular waveguide (101) is 8.26mm away from the distance in short-circuit face.
Further, the inner conductor diameter of the coaxial waveguide (102) is 6mm, and for outer conductor having a size of 8.88mm, length is big
In 30mm.
Further, the total length of the gradation type coaxial waveguide (103) is 55.86mm, the gradation type coaxial waveguide
(103) taper end inner and outer conductor size is identical as the inner and outer conductor size of the coaxial waveguide (102)；The gradation type is coaxial
The end maximum radius of the butt end inner conductor of waveguide (103) is 8.85mm, and outer conductor end maximum radius is 20mm；The gradual change
The inner and outer conductor Variable rate of type coaxial waveguide (103) meets Chebyshev's gradient ramp.
Further, the port radius of the gradation type circular waveguide taper end is 20mm, and the port radius of butt end is 25mm；
The Variable rate of the gradation type circular waveguide (104) meets Chebyshev's gradient ramp.
Further, the internal diameter of the metal ring (106) is 6mm, outer diameter 10.5mm.
The present invention can at least realize one of following beneficial effect:
(1) present invention passes through the structure of improved mode conversion equipment, can be realized in the wide (8.2GHz- of BJ100 all-wave conduction band
12.5GHz, relative bandwidth 41.5%) interior input return loss is greater than 23dB.
(2) apparatus of the present invention mode conversion efficiency is high, Insertion Loss is low；Highest transfer efficiency in all-wave conduction band is wide is higher than
99.9%, average transfer efficiency is 99.6%, and device Insertion Loss is lower than 0.1dB.
(3) intermediate conversion structure of the present invention uses thick coaxial transition technology, keeps overall structure connection stronger, improves
Device stability；And without dielectric support structure, converter dielectric loss is reduced, significantly improves the stabilization of device
Property, reduce installation error.
(4) the conversion equipment gradation type circular waveguide output par, c uses Chebyshev's gradual change impedance structure, fabulous improvement
The match condition of waveguide, significantly inhibits the transmission of clutter in circular waveguide, and output purity is high, and be conducive to reduce plus
Work error.
(5) mode conversion device of the present invention exports TM01Mode purity is higher than 99.5%, is highly suitable as TM01Mode swashs
Device use is encouraged, can be applied to a series of TM01Mode converter testing research.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is the exciter structure diagrammatic cross-section in the present embodiment；
Fig. 2 is the rectangular waveguide inner step impedance matching structure top view in the present embodiment；
Fig. 3 is the input standing wave and output TM of the mode exciter in the present embodiment01Mode purity result.
Specific embodiment
Specifically describing the preferred embodiment of the present invention with reference to the accompanying drawing, wherein attached drawing constitutes the application a part, and
Together with embodiments of the present invention for illustrating the principle of the present invention.
The embodiment of the invention discloses a kind of compact circular waveguide TM01Mode excitation device, as shown in Figure 1, including rectangle
Waveguide 101, coaxial waveguide 102, gradation type coaxial waveguide 103 and gradation type circular waveguide 104；
Specifically, rectangular waveguide 101 is standard BJ100 rectangular waveguide, to transmit X-band TE10Basic mode, the standard rectangular
Waveguide end is docked using ring flange with signal source, accesses TE as signal input part10Wave, the other end are short-circuit face.
The design parameter of waveguide includes:
Waveguide broadside length 22.86mm；
Narrow Wall of Waveguide edge lengths 10.16mm；
Waveguide length is less than 100mm.
Special, the wide face of rectangular waveguide of the 101 short-circuit face side of rectangular waveguide is equipped with circular opening；Circular opening
For being connect with coaxial waveguide 102, by electromagnetic transmission into coaxial waveguide 102；
Preferably, in order to reduce the wide interior return loss of BJ100 all-wave conduction band and with corresponding coaxial waveguide size
Matching, opening diameter need to be identical as the outer conductor diameter of selected coaxial waveguide, and to circular opening center away from short-circuit face away from
It is corresponding default from doing；For example, the outer conductor diameter 8.88mm of coaxial waveguide, the size selection are illustrated subsequent；Short circuit
The distance of identity distance circular opening central point is 8.26mm, about rectangular waveguide TE10The a quarter of mould waveguide wavelength, to short
Incidence wave is offset in reflection at the cavity of road surface.
Rectangular waveguide 101 is internally provided with the stepped impedance matching block 105 connecting with the coaxial waveguide 102, is used for
Impedance matching is carried out to transmission signal.
Specifically, stepped impedance matching block 105 is the metal step impedance matching block of 4 rank increasing lengths；Its step is most
High one end is connect with the short-circuit face of rectangular waveguide 101；And be equipped on the wide face of the stepped impedance matching block 105 with
The cylinder shape groove 107 that circular opening on the wide face of rectangular waveguide is coaxial and position is opposite, for in coaxial waveguide 102
Conductor connection.
The width of stepped impedance matching block 105 is identical as the broadside of rectangular waveguide 101, the stepped impedance mating structure
It is designed by Chebyshev's quarter-wave impedance matching theory, calculates initial value, then pass through electromagnetic simulation software
CST optimizes hierarchic structure, final to determine that 4 rank step lengths are respectively 32.75mm, 43.69mm, 52.58mm,
61.96mm, length difference are about a quarter of waveguide wavelength；Height is respectively 0.91mm, 2.49mm, 3.01mm, 1.38mm, rank
The introducing of terraced structure makes the relative bandwidth of device be promoted to 42%.
One end of coaxial waveguide 102 in the present embodiment is installed vertically in the circular opening in the wide face of rectangular waveguide 101, together
The inner conductor of axis waveguide 102 from circular opening be inserted into the cylinder shape groove 107 on stepped impedance matching block 105 and and its
Fixed, 102 outer conductor inside radius of coaxial waveguide is identical as the circular opening radius on rectangular waveguide；
Input the TE of rectangular waveguide 10110Wave is output to coaxial waveguide after the impedance matching of stepped impedance matching block 105
102 are converted to TEM coaxial wave；
Special, in the present embodiment, the inner conductor diameter of used coaxial waveguide 102 is selected as 6mm, and size is compared now such as
The coaxial waveguide inner conductor (less than 2mm) of modern same type device increases about 3 times and characteristic does not subtract；On the other hand, same in order to guarantee
The single mode transport condition of axis waveguide ends higher order mode, prevents it from entering subsequent circular waveguide and impacts to output purity, selects
The size of 102 outer conductor interior diameter of coaxial waveguide is 8.88mm.
Also, in order to realize that the present embodiment is to coaxial waveguide to effective transmission with interior electromagnetic wave and the inhibition to clutter
Length be made that limitation, the length of coaxial waveguide is greater than 30mm.
In order to further improve the connection of rectangular waveguide 101 and coaxial waveguide 102, more preferably impedance matching is realized,
The junction of 102 inner conductor of coaxial waveguide and stepped impedance matching block 105 is provided with coaxial with 102 inner conductor of coaxial waveguide
Metal ring 106；As shown in Fig. 2, 106 preferred size of metal ring are as follows: internal diameter 6mm is equal to coaxial waveguide inner conductor diameter；Outside
Diameter 10.5mm, for the optimal result for being able to achieve impedance matching.
The other end of coaxial waveguide 102 is connect with the taper end of gradation type coaxial waveguide 103；Gradation type coaxial waveguide 103
Butt end connects the taper end of gradation type circular waveguide 104, and the butt end of gradation type circular waveguide 104 is connect with signal output port；
Gradation type coaxial waveguide is connect with gradation type circular waveguide 104, and TEM coaxial wave has been motivated TM in circular waveguide01Wave
It is exported；In the TE by inputting10Wave to output TM01During the mode excitation of wave, coaxial waveguide is as intermediate conversion knot
Structure plays the connection function of excitation conversion.
In the present embodiment, coaxial waveguide, coaxial graded guide and gradation type circular waveguide use thick coaxial transition, make whole
The connection of body structure is stronger, improves device stability；And without dielectric support structure, reduce converter medium damage
Consumption.
In order to improve bandwidth of a device, guaranteeing the purity of high output electromagnetic wave and facilitate connection, the embodiment of the present invention is using gradually
Modification coaxial waveguide 103 is connect with coaxial waveguide 102, the taper end inner and outer conductor size of gradation type coaxial waveguide 103 and described same
The inner and outer conductor size of axis waveguide 102 is identical；On the gradual design of gradation type coaxial waveguide inner and outer conductor size, to cut ratio
Snow husband's gradient ramp impedance matching requirements are foundation, meet the inner and outer conductor Variable rate of gradation type coaxial waveguide 103 and cut ratio
Husband's gradient ramp is avenged, due to the increase with coaxial waveguide size, single mode transport condition no longer meets, by calculating, when outer half
When diameter reaches 22mm or so, coaxial TM will be generated02Wave, the wave can greatly influence TM in circular waveguide01The output purity of wave, because
And the present embodiment selects outer conductor end maximum radius for 20mm, and by CST software simulation optimization, obtains inner conductor end most
Large radius optimal solution is 8.85mm, and gradual change coaxial waveguide total length is 55.86mm.
Equally, in order to improve bandwidth of a device, guarantee the purity of high output electromagnetic wave and facilitate connection, the embodiment of the present invention pair
Output Circular waveguides are also improved, and are gradually transition to justify by coaxial graded guide outer conductor using gradation type circular waveguide
Output waveguide port, and during circular waveguide size carries out gradual change, so that each point of gradient ramp is met Qie Bixue
Husband's gradient ramp.
Final gradation type circular waveguide is preferably dimensioned to be, and the port radius of taper end is 20mm, convenient and gradation type on-axis wave
Lead connection；The port radius of butt end is 25mm, convenient for being attached after electromagnetic wave signal output with other waveguides or equipment；
Pass through, gradation type coaxial waveguide is connected with the matching size of gradation type circular waveguide, it is ensured that the leading biography of TEM wave
Defeated status simultaneously prevents from excessive clutter from entering circular waveguide producing bigger effect device overall output purity.
As shown in figure 3, for the input standing wave and output TM of mode exciter in the present embodiment01Mode purity result, it is seen that
Export TM01Mode purity is higher than 99.5%, and highest transfer efficiency is higher than 99.9%, and average transfer efficiency is 99.6%.
In conclusion compact circular waveguide TM disclosed in the present embodiment01Mode excitation device can be realized complete in BJ100
Waveguide bandwidth (8.2GHz-12.5GHz, relative bandwidth 41.5%) interior input return loss is greater than 23dB；And high conversion efficiency,
Insertion Loss is low；Highest transfer efficiency in all-wave conduction band is wide is higher than 99.9%, and average transfer efficiency is 99.6%, and device Insertion Loss is low
In 0.1dB；During excessive from coaxial waveguide to circular waveguide, coaxial waveguide, coaxial graded guide and gradation type circle wave
It leads using thick coaxial transition, keeps overall structure connection stronger, improve device stability, significantly improve device
Stability reduces installation error；And without dielectric support structure, reduce converter dielectric loss；Waveguide dimensions gradual change
Cheng Zhong, progressive formation meet Chebyshev's gradual change resistance requirements, and the fabulous match condition for improving waveguide significantly inhibits
The transmission of clutter in circular waveguide, output purity is high, and is conducive to reduce mismachining tolerance；Also, this mode conversion device is defeated
TM out01Mode purity is higher than 99.5%, is highly suitable as TM01Mode exciter uses, and it is a series of can also to be applied to other
TM01In the research application of mode converter test.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of compact circular waveguide TM01Mode excitation device, which is characterized in that including rectangular waveguide (101), coaxial waveguide
(102), gradation type coaxial waveguide (103) and gradation type circular waveguide (104)；
One end of the rectangular waveguide (101) is signal input part, is connect with signal source；The other end is short-circuit face；Described short
The wide face of the rectangular waveguide of road surface side is equipped with circular opening；
One end of the coaxial waveguide (102) is connect by the way that the circular opening is vertical with the rectangular waveguide (101), the other end
It is connect with the taper end of the gradation type coaxial waveguide (103)；
The butt end of the gradation type coaxial waveguide (103) connects the taper end of the gradation type circular waveguide (104), the gradation type circle
Output end of the butt end of waveguide (104) as signal；
The rectangular waveguide (101) is internally provided with the stepped impedance matching block connecting with the coaxial waveguide (102)
(105), for carrying out impedance matching to transmission signal.
2. mode excitation device according to claim 1, which is characterized in that the step type impedance matching block (105)
One end is connect with the short-circuit face of the rectangular waveguide (101)；Be equipped on the wide face of the stepped impedance matching block (105) with
The cylinder shape groove (107) that circular opening on the wide face of rectangular waveguide is coaxial and position is opposite, for it is described coaxial
The inner conductor of waveguide (102) connects.
3. mode excitation device according to claim 2, which is characterized in that the step type impedance matching block (105) is 4
The metal step impedance matching block of rank increasing lengths.
4. mode excitation device according to claim 1 to 3, which is characterized in that further include metal ring (106), institute
The junction that metal ring (106) is set to the coaxial waveguide (102) inner conductor and stepped impedance matching block (105) is stated,
It is coaxial with the coaxial waveguide (102) inner conductor.
5. mode excitation device according to claim 4, which is characterized in that rectangular waveguide (101) input port
Broadside is less than 100mm having a size of 10.16mm, length having a size of 22.86mm, narrow side；The circle in the wide face of the rectangular waveguide (101)
Opening diameter is identical as the outer conductor diameter of the coaxial waveguide (102)；
The width of the step type impedance matching block (105) is identical as the broadside of the rectangular waveguide (101), internal 4 rank ladders
Length is respectively 32.75mm, 43.69mm, 52.58mm, 61.96mm；Height respectively 0.91mm, 2.49mm, 3.01mm,
1.38mm。
6. mode excitation device according to claim 4, which is characterized in that the circle in the wide face of the rectangular waveguide (101)
Distance of the aperture away from short-circuit face is 8.26mm.
7. mode excitation device according to claim 4, which is characterized in that the inner conductor of the coaxial waveguide (102) is straight
Diameter is 6mm, and outer conductor is greater than 30mm having a size of 8.88mm, length.
8. mode excitation device according to claim 4, which is characterized in that the gradation type coaxial waveguide (103) it is total
Length is 55.86mm, taper end inner and outer conductor size and the coaxial waveguide (102) of the gradation type coaxial waveguide (103)
Inner and outer conductor size is identical；The end maximum radius of the butt end inner conductor of the gradation type coaxial waveguide (103) is 8.85mm,
Outer conductor end maximum radius is 20mm；The inner and outer conductor Variable rate of the gradation type coaxial waveguide (103) meets Qie Bixue
Husband's gradient ramp.
9. mode excitation device according to claim 4, which is characterized in that the port of the gradation type circular waveguide taper end
Radius is 20mm, and the port radius of butt end is 25mm；The Variable rate of the gradation type circular waveguide (104) meets Chebyshev gradually
Varied curve.
10. mode excitation device according to claim 4, which is characterized in that the internal diameter of the metal ring (106) is
6mm, outer diameter 10.5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910168397.8A CN109768354A (en) | 2019-03-06 | 2019-03-06 | A kind of compact circular waveguide TM01Mode excitation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910168397.8A CN109768354A (en) | 2019-03-06 | 2019-03-06 | A kind of compact circular waveguide TM01Mode excitation device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113097676A (en) * | 2021-03-25 | 2021-07-09 | 广东省蓝波湾智能科技有限公司 | Waveguide coaxial converter |
| CN114156658A (en) * | 2021-11-26 | 2022-03-08 | 北京邮电大学 | Broadband transmission line |
| CN114583429A (en) * | 2020-11-30 | 2022-06-03 | 京东方科技集团股份有限公司 | Waveguide conversion structure, waveguide feed network and antenna system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583429A (en) * | 2020-11-30 | 2022-06-03 | 京东方科技集团股份有限公司 | Waveguide conversion structure, waveguide feed network and antenna system |
| CN114583429B (en) * | 2020-11-30 | 2024-04-16 | 京东方科技集团股份有限公司 | Waveguide conversion structure, waveguide feed network and antenna system |
| CN113097676A (en) * | 2021-03-25 | 2021-07-09 | 广东省蓝波湾智能科技有限公司 | Waveguide coaxial converter |
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| CN114156658B (en) * | 2021-11-26 | 2022-12-06 | 北京邮电大学 | Broadband transmission line |
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Application publication date: 20190517 |