CN106941061B - Compact type broadband TEn0-HE0nMode conversion device - Google Patents
Compact type broadband TEn0-HE0nMode conversion device Download PDFInfo
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- CN106941061B CN106941061B CN201710275314.6A CN201710275314A CN106941061B CN 106941061 B CN106941061 B CN 106941061B CN 201710275314 A CN201710275314 A CN 201710275314A CN 106941061 B CN106941061 B CN 106941061B
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- waveguide
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- confocal waveguide
- conversion device
- minute surface
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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
- H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
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Abstract
The invention discloses Compact type broadband TEn0 HE0n mode conversion devices, belong to vacuum electronics technology field.The device includes sequentially connected input rectangular waveguide, N grades of step transforming sections, confocal waveguide segment is closed in output, output opens confocal waveguide segment.The structure carries out multi-stage stairs gradual change to confocal waveguide curvature mirror radius and minute surface width simultaneously, it realizes and is better than 1dB in frequency band internal schema transformation efficiency of the relative bandwidth more than 50%, and transmission curve is flat, smooth, tapered length greatly shortens compared with linear gradient, compact-sized, easy to process.
Description
Technical field
The invention belongs to vacuum electronics technology fields, and in particular to a kind of applied to the confocal of millimeter wave and terahertz wave band
Cold survey of waveguide Cyclotron radio frequency system uses mode conversion device.
Background technology
In recent years, both at home and abroad in millimeter wave, the confocal waveguide Cyclotron of Terahertz frequency range (including confocal waveguide cyclotron oscillation
Device and confocal waveguide gyro-TWA part) development in terms of have made great progress.Confocal waveguiding structure is carried by MIT
A kind of novel interacting formations gone out, the structure have good model selection characteristic so that Cyclotron can stablize work
Make in high-order mode state, efficiently solves traditional Cyclotron phenomenon is spent together due to size and be difficult to work in W-waveband and Terahertz
The bottleneck of frequency range.In confocal waveguide Cyclotron, transverse mode HE0nPattern, when n is even number, this pattern and cylinder
TE in waveguide0,n/2Mode field distribution is similar.When developing confocal waveguide Cyclotron, need to operating mode in radio frequency system
With the dispersion characteristics and loss characteristic (gyro-TWA part) and the Q value of cavity and resonant frequency of main parasitic pattern
(cyclotron oscillation device) carries out cold survey experiment.Cold survey is carried out to the above characteristic of confocal waveguide radio frequency system, it is confocal to develop excitation
Higher order mode HE in waveguide0nMode conversion device be required.Cold survey experiment needs to meet broadband, in band with mode exciter
The characteristics such as flatness is good, a kind of feasible scheme are will to encourage HE0nThe mode conversion device of mould is divided into two sections and is designed respectively：
1) rectangular waveguide TE10Mould is to rectangular waveguide TEn0The mode conversion device of mould；2) rectangular waveguide TEn0Mould is to confocal waveguide HE0nMould
Mode conversion device.Present invention is generally directed to second segments to be designed, it is proposed that a kind of Compact type broadband rectangular waveguide TEn0Mould
Formula is to confocal waveguide HE0nThe mode conversion device of pattern.
Invention content
The present invention is for the confocal waveguide higher order mode HE of excitation0nMode conversion device in confocal waveguide Cyclotron high frequency
A kind of cold important function surveyed in experiment of system, it is proposed that Compact type broadband rectangular waveguide TEn0Pattern is to confocal waveguide HE0nMould
The mode conversion device of formula, the structure carry out multi-stage stairs gradual change to confocal waveguide curvature mirror radius and minute surface width simultaneously,
It realizes and is better than -1dB in frequency band internal schema transformation efficiency of the relative bandwidth more than 50%, and transmission curve is flat, smooth, with line
Property gradual change is greatly shortened compared to tapered length, compact-sized, easy to process.
The present invention specifically adopts the following technical scheme that：
A kind of Compact type broadband TEn0-HE0nMode conversion device, the device include input rectangular waveguide, the N set gradually
Grade step transition, output close confocal waveguide segment, the open confocal waveguide segment of output, it is characterised in that N grades of step transitions
The radius of curvature and minute surface width of confocal waveguide minute surface are multi-stage stairs gradual change, it is contemplated that mode conversion efficiency and difficulty of processing, N
Value is 3~10.
Further, the mode gradual change process is completed in closed N grades of step transition, effectively avoids mode conversion
The microwave diffraction loss of open cavity, improves pattern transformation efficiency in journey.
Further, it is a quarter waveguide wavelength per level-one step Transition length initial value, numerical value can finally lead to
The three-dimensional artificials software optimization such as CST or HFSS is crossed to obtain.
Further, gradual change series N and minute surface width per level-one and curvature mirror radius can by CST or
The three-dimensional artificials software optimization such as HFSS obtains.
Advantages of the present invention：
1) rectangular waveguide higher order mode TE when n=1,2,3 ... can be achievedn0To confocal waveguide higher order mode HE0nTransformation.
2) linear gradient is compared, variation segment length is substantially shorter, it is compact-sized, easy to process, it is convenient for practical application.
3) mode conversion process is completed in closing chamber, is finally transformed to the confocal waveguide segment of output, is finally sealed again by output
It closes confocal waveguide segment and is transformed to the open confocal waveguide segment of output, effectively avoid the microwave diffraction damage of open cavity during mode conversion
Consumption improves pattern transformation efficiency.
4) step gradual change while to confocal waveguide curvature mirror radius and minute surface width is carried out, shortens Transition length, knot
Structure is compact, easy to process.
Description of the drawings
Fig. 1 is Compact type broadband TE proposed by the present inventionn0-HE0nMode conversion device tomograph.
Fig. 2 is Compact type broadband TE proposed by the present inventionn0-HE0nMode conversion device y-z plane sectional structure chart.
Fig. 3 is Compact type broadband TE proposed by the present inventionn0-HE0nMode conversion device distribution map of the electric field.
Fig. 4 is Compact type broadband TE proposed by the present inventionn0-HE0nMode conversion device S parameter (transmission and reflection) curve.
Drawing reference numeral explanation：Input rectangular waveguide 1, first order step transition 2, second level step transition 3, the third level
Step transition 4 closes confocal waveguide deferent segment 5, open confocal waveguide deferent segment 6.
Specific implementation mode
Below just with W-waveband (centre frequency 95GHz) rectangular waveguide TE40Mould is to confocal waveguide HE04The mode conversion of pattern
For device, the present invention is described in more detail.
If the radius of curvature of confocal waveguide minute surface is rc, the spacing of two minute surfaces is Lt, the width of minute surface is 2a.Confocal waveguide
In Cyclotron, curvature mirror radius is equal with minute surface spacing, i.e. rc=Lt, for the HE transmitted in confocal waveguide0nMould, laterally
Wave number can be expressed as
N indicates the two minute surface bays number that Amplitude maxima occurs in the y-axis direction in formula.
The relationship of cutoff frequency and lateral wave number
Dispersion characteristics relationship is
K and k in formulazRespectively wave number and longitudinal wave number.When n is even number, if with the TE in circular waveguide0,n/2Mould analogy
HE in confocal waveguide0nMould, it is found that pattern density is sparse compared with circular waveguide much in confocal waveguide.
Transmit TEn0The broadside size a of pattern rectangular waveguideinWith transmission HE0nThe confocal waveguide minute surface spacing of output of pattern
LtoutIt is determined by cutoff frequency, thus ainWith LtoutAdjoining dimensions only need in design to inputting rectangular waveguide narrow side binWith altogether
Burnt waveguide minute surface width is converted.Narrow side width is first b by the present inventioninInput rectangular waveguide transform to width be 2aout's
Confocal waveguide is closed, open confocal waveguide is finally transformed to from closed confocal waveguide, is avoided due in mode gradual change section
Diffraction loss caused by open confocal waveguide, to improve mode conversion efficiency.In view of the confocal waveguide minute surface width of opening
2aoutHE when larger0nThe diffraction loss of mould is very small, the 2a chosen in designoutIt is larger, finally again by width be 2aoutClosing
Confocal waveguide transition to width be 2aoutThe confocal waveguide of opening, in actual use can by width be 2aoutOpening it is confocal
Waveguide is gradient to the minute surface width for being suitable for high-frequency structure.By N grades of quarter-wave transitions by narrow side size be bin's
Rectangular waveguide transforms to 2aoutThe confocal waveguide of closing of width should carry out step gradual change, i.e., simultaneously in two directions in the process：1)
Compressed that (input rectangular waveguide can be equivalent to the closing that curvature mirror radius is infinitely great to confocal waveguide curvature mirror radius
Confocal waveguide)；2) gradual change increase is carried out to minute surface width.
Table 1 is W-waveband TE40-HE04Main structure parameters list after the optimization of step gradual-change mode converting means.
Main structure parameters after table 1 optimizes
Attached drawing 1 and attached drawing 2 are respectively Compact type broadband TE proposed by the present inventionn0-HE0nMode conversion device three-dimensional structure
Figure and y-z plane sectional view, kind of structure 1 are input rectangular waveguide, and structure 2,3,4 is respectively three-level step grading structure, from
Structure 1 arrives structure 5, and the radius of curvature of confocal waveguide is gradually reduced from infinity, while the width in the directions x gradually increases.Structure 5
For the confocal waveguide of closing finally converted, structure 6 is the confocal waveguide that the directions x open.Wherein, rectangular waveguide is inputted
Minute surface maximum distance between broadside, three-level step transition and closing (opening) confocal waveguide deferent segment is identical.
Attached drawing 3 show Compact type broadband TE proposed by the present inventionn0-HE0nMode conversion device field distribution, due to square
Shape waveguide is closing chamber in the directions x (narrow side direction), it may be considered that rectangular waveguide is gradient to the closed confocal waveguide in the directions x,
Closed confocal waveguide is changed into open cavity again, in order to ensure before and after confocal waveguide x direction closings of the frontier to field in design
Disturbance is smaller, can rectangular waveguide first be transformed to the wider confocal waveguide of minute surface, transform to suitable mirror in actual use again
Face width.When the curvature mirror radius of closed confocal waveguide constantly increases to infinity, it is rectangular wave that confocal waveguide, which is degenerated,
It leads.Therefore, when the spacing between the minute surface for keeping confocal waveguide is constant, (constantly increase curvature mirror half by N grades of step gradual changes
Diameter) confocal waveguide can be transformed to rectangular waveguide.
Field distribution due to rectangular waveguide in the directions x is uniform, and electric field is unevenly distributed in the x-direction in confocal waveguide
With electric field is most strong at center, is gradually reduced with the increase electric field of x.When the minute surface width 2a of confocal waveguide is larger, in x
On direction, field is concentrated mainly at center, weaker closer to boundary field, if thus only changing mirror during step gradual change
If curvature radius, the efficiency and bandwidth of pattern conversion can be limited.The present invention is right by during N grades of step gradual changes
Curvature mirror radius increases and minute surface width compression both direction is carried out at the same time gradual change, makes the field distribution not disconnecting in rectangular waveguide
Nearly closed confocal waveguide cavity, gradual change series N and the length per level-one, minute surface width and curvature mirror radius can pass through
The three-dimensional artificials software optimization such as CST or HFSS obtains, may finally obtain broadband, high conversion efficiency mode conversion device.
Attached drawing 4 show Compact type broadband TE proposed by the present inventionn0-HE0nMode conversion device S parameter (is transmitted and anti-
Penetrate) curve, when frequency is higher than 91.85GHz (140GHz is arrived in emulation), pattern conversion is better than -1dB；Reflectivity curve 92.4GHz
Better than -15dB, coverage diagram is smooth, and resonance free point generates.In example, the open confocal waveguide segment of output will produce additional
Diffraction loss, and with LzoutIncrease and increase, but due to minute surface width 2azoutIt is bigger, therefore HE04The diffraction loss of mould
Very little, thus actual transfer efficiency is slightly above the result in attached drawing 4.
Above example only invent for convenience of description by the utility model, and n=1,2,3 ... arbitrary HE can be achieved in the present invention0n-TEn0Pattern
Converting means transform sequence, and TE may be implemented by exchange input, outbound coursen0-HE0nMode conversion sequence.Institute of the present invention
State mode conversion device with broadband, with interior smooth, the advantages such as transfer efficiency height, and it is compact-sized, it is easy to process, be suitble to
In the radio frequency system of millimeter wave and Terahertz frequency range confocal waveguide gyro-TWA part and confocal waveguide cyclotron oscillation device
Cold survey experiment.
Claims (2)
1. a kind of Compact type broadband TEn0-HE0nMode conversion device, the device include the input rectangular waveguide set gradually, N grades
Step transition, output close confocal waveguide segment, the open confocal waveguide segment of output, it is characterised in that：N grades of step transitions are total to
The radius of curvature and minute surface width of burnt waveguide minute surface are carried out at the same time multi-stage stairs gradual change.
2. a kind of Compact type broadband TE as described in claim 1n0-HE0nMode conversion device, it is characterised in that：The N grades of platform
N values are 3~10 in rank transition.
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| CN110596570B (en) * | 2019-08-30 | 2021-09-24 | 电子科技大学 | Confocal waveguide high-frequency circuit test system |
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| JPH03274802A (en) * | 1990-03-26 | 1991-12-05 | Toshiba Corp | Waveguide and gyrotron device using the same |
| CN102377000A (en) * | 2010-08-11 | 2012-03-14 | 中国科学院电子学研究所 | High-frequency conversion structure with rectangular-circular mode |
| CN104485499A (en) * | 2014-11-13 | 2015-04-01 | 中国电子科技集团公司第二十三研究所 | Gradually-varied step-type waveguide transition device and processing method thereof |
| CN204391227U (en) * | 2014-11-24 | 2015-06-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of K-band rectangle TE10-circular waveguide TE01 mode transition structure of practicality |
| CN204834817U (en) * | 2015-08-14 | 2015-12-02 | 成都信息工程大学 | Coaxial converter of broadband waveguide |
| CN105552483A (en) * | 2015-12-17 | 2016-05-04 | 电子科技大学 | TE<0>0n/TE<0>1n mode exciter |
| CN105789806A (en) * | 2016-03-17 | 2016-07-20 | 西安电子工程研究所 | Medium sealed type small broadband microstrip to waveguide converter |
-
2017
- 2017-04-25 CN CN201710275314.6A patent/CN106941061B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| JPH03274802A (en) * | 1990-03-26 | 1991-12-05 | Toshiba Corp | Waveguide and gyrotron device using the same |
| CN102377000A (en) * | 2010-08-11 | 2012-03-14 | 中国科学院电子学研究所 | High-frequency conversion structure with rectangular-circular mode |
| CN104485499A (en) * | 2014-11-13 | 2015-04-01 | 中国电子科技集团公司第二十三研究所 | Gradually-varied step-type waveguide transition device and processing method thereof |
| CN204391227U (en) * | 2014-11-24 | 2015-06-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of K-band rectangle TE10-circular waveguide TE01 mode transition structure of practicality |
| CN204834817U (en) * | 2015-08-14 | 2015-12-02 | 成都信息工程大学 | Coaxial converter of broadband waveguide |
| CN105552483A (en) * | 2015-12-17 | 2016-05-04 | 电子科技大学 | TE<0>0n/TE<0>1n mode exciter |
| CN105789806A (en) * | 2016-03-17 | 2016-07-20 | 西安电子工程研究所 | Medium sealed type small broadband microstrip to waveguide converter |
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| 宽带非均匀半径渐变TEOn-TE0(n+1)模式转换器的设计研究;孙旭等;《物理学报》;20080430;第57卷(第4期);第2130-2135页 * |
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