Design Study of a 372-GHz Higher Order Mode Input Coupler

被引：22

作者：

Garner, Jason R. ^{[1
]}

Zhang, Liang ^{[1
]}

Donaldson, Craig R. ^{[1
]}

Cross, Adrian W. ^{[1
]}

He, Wenlong ^{[1
]}

机构：

[1] Univ Strathclyde, Dept Phys, Scottish Univ Phys Alliance, Glasgow G4 0NG, Lanark, Scotland

来源：

IEEE TRANSACTIONS ON ELECTRON DEVICES | 2016年 / 63卷 / 08期

基金：

英国工程与自然科学研究理事会;

关键词：

Gyrotron travelling wave amplifier (gyro-TWA); mode coupling; terahertz input coupler; waveguide coupler;

D O I：

10.1109/TED.2016.2581314

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The design of a higher order mode (HOM) input coupler for a low-terahertz gyrotron travelling wave amplifier is presented. A two-branch waveguide coupler based on the even distribution of incident power is designed to couple the rectangular TE10 mode to the circular TE61 mode. The optimised tapered waveguide input coupler achieved an operating frequency range of 359-385 GHz, equating to a bandwidth of 7%. A prototype waveguide coupler scaled to W-band (75-110 GHz) was manufactured. The vector network analyser measured return loss of the HOM coupler is shown to be <10 dB at 90-96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the coupler.

引用

页码：3284 / 3290

页数：7

共 14 条

[1] High-gain wide-band gyrotron traveling wave amplifier with a helically corrugated waveguide
Bratman, VL
Cross, AW
Denisov, GG
He, W
Phelps, ADR
Ronald, K
Samsonov, SV
Whyte, CG
Young, AR
[J]. PHYSICAL REVIEW LETTERS, 2000, 84 (12) : 2746 - 2749
[2] The electron cyclotron maser
Chu, KR
[J]. REVIEWS OF MODERN PHYSICS, 2004, 76 (02) : 489 - 540
[3] Electron cyclotron current drive and suprathermal electron dynamics in the TCV tokamak
Coda, S
Alberti, S
Blanchard, P
Goodman, TP
Henderson, MA
Nikkola, P
Peysson, Y
Sauter, O
[J]. NUCLEAR FUSION, 2003, 43 (11) : 1361 - 1370
[4] Czerwinski M., 2014, Linc. Lab. J, V21, P28
[5] Design Study of a Fundamental Mode Input Coupler for a 372-GHz Gyro-TWA I: Rectangular-to-Circular Coupling Methods
Garner, Jason R.
Zhang, Liang
Donaldson, Craig R.
Cross, Adrian W.
He, Wenlong
[J]. IEEE TRANSACTIONS ON ELECTRON DEVICES, 2016, 63 (01) : 497 - 503
[6] High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region
He, W.
Donaldson, C. R.
Zhang, L.
Ronald, K.
McElhinney, P.
Cross, A. W.
[J]. PHYSICAL REVIEW LETTERS, 2013, 110 (16)
[7] Johnson R. C., 1959, IRE T MTT, V7, P374
[8] MATSUMARU K, 1958, IRE T MICROWAVE THEO, V6, P143
[9] THz Dynamic Nuclear Polarization NMR
Nanni, Emilio A.
Barnes, Alexander B.
Griffin, Robert G.
Temkin, Richard J.
[J]. IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY, 2011, 1 (01) : 145 - 163
[10] Science and Technologies Facilities Council, 2016, CNC NAN

← 1 2 →