CN109950115A - A kind of novel double confocal waveguide gyrotron traveling wave tube high-frequency structures - Google Patents
A kind of novel double confocal waveguide gyrotron traveling wave tube high-frequency structures Download PDFInfo
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- CN109950115A CN109950115A CN201910237300.4A CN201910237300A CN109950115A CN 109950115 A CN109950115 A CN 109950115A CN 201910237300 A CN201910237300 A CN 201910237300A CN 109950115 A CN109950115 A CN 109950115A
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Abstract
The invention is a kind of novel high-frequency structure for gyrotron traveling wave tube, referred to as double confocal waveguides.Its main feature is that being made of two groups of confocal waveguides of list, every group of confocal waveguide of list is made of the confocal mirror surface that two curvature radius are equal to mirror surface spacing.Therefore double confocal waveguides are made of the identical and symmetrical confocal mirror surface in four sides in total.Such double confocal waveguides have sparse pattern density and good model selection characteristic, it is achieved that the high-order mode of gyrotron traveling wave tube works, so that the working frequency of gyrotron traveling wave tube be made to expand to W-waveband or more (94GHz).Novel double confocal waveguides significantly improve the note wave interaction efficiency of gyrotron traveling wave tube compared with traditional confocal waveguide of list.
Description
Technical field
The invention belongs to microwave, millimeter wave and THz devices technical field, specifically a kind of double confocal waveguides are returned
The high-frequency structure of rotating wave duct can be applied and involve the gyrotron traveling wave tube of terahertz wave band in millimeter.
Background technique
Gyrotron traveling wave tube (Gyro-TWT) amplifier is as a kind of microwave electrovacuum device based on electronic cyclotron maser mechanism
Part, the characteristics such as the broadband shown by it in millimeter wave or even Terahertz frequency range, high-power, high efficiency make it existing
It has a wide range of applications for fields such as advanced capabilities radar, telecommunication technology, electronic countermeasures
Gyrotron traveling wave tube, as its interacting formations, is theoretically based on electron cyclotron arteries and veins compared to other using smooth waveguide
The amplifier of plug mechanism has broader bandwidth and higher efficiency.However the gyrotron traveling wave tube of smooth waveguide is used to hold very much
Vulnerable to the influence of unwanted oscillation, this includes absolute instability oscillation, backward wave oscillation and the reflection oscillation at nearly cut-off.For
This, scientists from all over the world are inhibited unwanted oscillation by the method for coated by dielectric and make gyrotron traveling wave tube to improve its gain
It can be in low-order mode steady operation.
However when the working frequency of gyrotron traveling wave tube is further increased to W-waveband (94GHz) or more, work in basic mode or
The size of high-frequency structure corresponding to person's low step mode is excessively small, is difficult to electronics note by so small knot
On the other hand structure also limits the power capacity of gyrotron traveling wave tube.Massachusetts Institute Technology (MIT) proposes using altogether thus
High-frequency structure of the burnt waveguide as gyrotron traveling wave tube.This quasi-optical structure has more sparse pattern density and due to two sides
Open boundary the characteristics of making it have distribution losses, this loss is different different mode, selects and small mode is lost
As operating mode, competitive mode then has very big loss.Therefore confocal waveguide gyrotron traveling wave tube can work in high-order mode
Formula solves the difficulty that can not work in high band since size spends effect together and (is detailed in " High-Power140-GHz
Quasioptical Gyrotron Traveling-Wave Amplifier ", author: J.RSirigiri et al., 2003).
Since the transverse field of confocal waveguide is unevenly distributed, so that part electronics and the interaction of high frequency field are insufficient, therefore
The efficiency that confocal waveguide gyrotron traveling wave tube is compared with circular waveguide gyrotron traveling wave tube is lower.
Summary of the invention
It is proposed the purpose of the present invention is lower for single confocal waveguide gyrotron traveling wave tube note wave interaction efficiency, this
The novel bis- confocal waveguides of quasi-optical structure-are to increase by a secondary identical confocal waveguide at the two sides opening of traditional single confocal waveguide
It constitutes, to significantly improve the interaction efficiency of gyrotron traveling wave tube.
The purpose of the present invention has following technical measures realization:
A kind of high-frequency structure of double confocal waveguide gyrotron traveling wave tubes, the structure are made of two groups of confocal waveguides of list, and every group of list is confocal
Waveguide is made of the identical confocal mirror surface of two curvature radius.It is characterized by: the identical confocal mirror surface in four sides is symmetrical, mirror
Interplanar distance is equal to the radius of curvature of mirror, and the focus of upper mirror surface is located on lower mirror surface, and the focus of lower mirror surface is located on upper mirror surface, left
The focus of mirror surface is located on right mirror surface, and the focus of right mirror surface, which is located at, to be done on mirror surface.
Further, the mirror surface width of double confocal waveguides should be moderate.The too big then diffraction gap of mirror surface width is smaller,
So that the model selection characteristic of waveguide is unobvious, it will finally aggravate the mode competition of gyrotron traveling wave tube.If mirror surface width is too small
Diffraction gap is excessive, so that the loss of all modes increases, eventually reduces the working efficiency of gyrotron traveling wave tube.Therefore need according to
According to the design frequency of gyrotron traveling wave tube, optimize mirror surface width, selects a moderate mirror roomy small.
The present invention has the advantage that
1) compared to circular waveguide gyrotron traveling wave tube, since there is sparse pattern density and good mode to select for double confocal waveguides
Characteristic is selected, therefore double confocal waveguide gyrotron traveling wave tubes can be made to work in higher order mode, to not spent together effect by size
It restricts.
2) significant since the lateral field distribution of double confocal waveguides is more uniform compared to single confocal waveguide gyrotron traveling wave tube
Improve the working efficiency of gyrotron traveling wave tube.
Detailed description of the invention
Attached drawing 1 is double confocal waveguide tomographs provided by the invention.Attached drawing 2 is double confocal waveguides provided by the invention
Transverse cross-sectional view.
Drawing reference numeral illustrates: 1,2,3,4 marked in attached drawing 1 and attached drawing 2 are respectively the four sides for constituting double confocal waveguides
Symmetrical confocal mirror surface, the Rc marked in figure indicate the distance between upper and lower surface mirror (1,2 mirror surface), left and right two sides mirror
The distance of sub (3,4 mirror surface) is also Rc, and Rc is also equal to the radius of curvature of four sides mirror.The mirror surface width of every mirror is
2a。
Specific embodiment
The present invention is specifically described in the embodiment worked near 140GHz below by one, it is necessary to herein means
Out be that the present embodiment is served only for that invention is further explained, should not be understood as the limitation protected to the present invention, the neck
The personnel that are skillful in domain can make some nonessential modifications and adaptations according to the content of aforementioned present invention.
There are two key parameters: the mirror surface spacing Rc and wide 2a of mirror in double confocal waveguide junction compositions of attached drawing 1 and attached drawing 2.
The value of mirror surface spacing Rc is dependent on the working frequency and operating mode of gyrotron traveling wave tube.Such as it works in
140GHz, operating mode are superposition mould HE06The gyrotron traveling wave tube of mould, Rc can be 6.9mm with value.
The value size of the wide 2a of mirror determines that the size in gap at double confocal waveguide sides openings, gap size determine again
The loss size of each mode.If 2a value is too small, open diffraction gap is larger, and the loss of all modes all can be larger.Though
So be conducive to the stability of gyrotron traveling wave tube work, but can also reduce the efficiency of note wave interaction.If 2a value is excessive, diffraction
Gap is smaller, and the loss of all modes is all smaller.Although the note wave interaction efficiency of gyrotron traveling wave tube can be improved, also can
Aggravate mode competition, to influence the stability of gyrotron traveling wave tube.
Claims (4)
1. a kind of high-frequency structure of novel double confocal waveguide gyrotron traveling wave tubes, it is characterised in that double confocal waveguides are identical by two groups
Single confocal waveguide composition, every group of confocal waveguide of list are made of the confocal mirror surface in two sides；Between mirror surface and it is not connected to be separated from each other.
2. a kind of novel double confocal waveguiding structures as described in claim 1, it is characterised in that constitute every group of list of double confocal waveguides
Confocal waveguide is made of the confocal mirror surface that two curvature radius are equal to mirror surface spacing.
3. a kind of novel double confocal waveguiding structures as described in claim 1, it is characterised in that double confocal waveguides come to by four sides
The identical confocal mirror surface of radius of curvature is in angular symmetrical composition.
4. a kind of novel double confocal waveguiding structures as described in claim 1, it is characterised in that double confocal waveguides belong to open humorous
Shake chamber, and side wall has biggish open space.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910237300.4A CN109950115A (en) | 2019-03-27 | 2019-03-27 | A kind of novel double confocal waveguide gyrotron traveling wave tube high-frequency structures |
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| CN201910237300.4A CN109950115A (en) | 2019-03-27 | 2019-03-27 | A kind of novel double confocal waveguide gyrotron traveling wave tube high-frequency structures |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111144050A (en) * | 2019-12-30 | 2020-05-12 | 电子科技大学 | Design method of strip traveling wave tube slow wave structure working in high-order mode |
| CN112908810A (en) * | 2021-02-08 | 2021-06-04 | 电子科技大学 | High-frequency circuit of wedge-shaped confocal waveguide cyclotron device |
| CN113161216A (en) * | 2021-02-28 | 2021-07-23 | 电子科技大学 | Compact double-confocal waveguide cyclotron traveling wave tube input coupler |
-
2019
- 2019-03-27 CN CN201910237300.4A patent/CN109950115A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111144050A (en) * | 2019-12-30 | 2020-05-12 | 电子科技大学 | Design method of strip traveling wave tube slow wave structure working in high-order mode |
| CN111144050B (en) * | 2019-12-30 | 2022-03-15 | 电子科技大学 | Design method of strip traveling wave tube slow wave structure working in high-order mode |
| CN112908810A (en) * | 2021-02-08 | 2021-06-04 | 电子科技大学 | High-frequency circuit of wedge-shaped confocal waveguide cyclotron device |
| CN113161216A (en) * | 2021-02-28 | 2021-07-23 | 电子科技大学 | Compact double-confocal waveguide cyclotron traveling wave tube input coupler |
| CN113161216B (en) * | 2021-02-28 | 2022-07-29 | 电子科技大学 | Compact double-confocal waveguide cyclotron traveling wave tube input coupler |
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Application publication date: 20190628 |
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