Design study of a 372 GHz higher order mode input coupler

Jason R. Garner; Liang Zhang; Craig R. Donaldson; Adrian W. Cross; Wenlong He

doi:10.1109/TED.2016.2581314

Design study of a 372 GHz higher order mode input coupler

Jason R. Garner, Liang Zhang, Craig R. Donaldson, Adrian W. Cross, Wenlong He

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20 Citations (Scopus)

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Abstract

The design of a higher order mode (HOM) input coupler for a low-THz gyrotron travelling wave amplifier (gyro-TWA) 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 (75GHz to 110GHz) was manufactured. Vector Network Analyser (VNA) measured return loss of the HOM coupler is shown to be < 10dB at 90 – 96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the coupler.

Original language	English
Pages (from-to)	3284-3290
Number of pages	7
Journal	IEEE Transactions on Electron Devices
Volume	63
Issue number	8
DOIs	https://doi.org/10.1109/TED.2016.2581314
Publication status	Published - 31 Aug 2016

Keywords

Gyro-TWA
mode coupling
waveguide coupler
THz input coupler

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10.1109/TED.2016.2581314

Garner-etal-TED-2016-design-study-of-a-372-ghz-higher-order-mode-input-couplerAccepted author manuscript, 1 MB

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title = "Design study of a 372 GHz higher order mode input coupler",

abstract = "The design of a higher order mode (HOM) input coupler for a low-THz gyrotron travelling wave amplifier (gyro-TWA) 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 (75GHz to 110GHz) was manufactured. Vector Network Analyser (VNA) measured return loss of the HOM coupler is shown to be < 10dB at 90 – 96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the coupler.",

keywords = "Gyro-TWA, mode coupling, waveguide coupler, THz input coupler",

author = "Garner, {Jason R.} and Liang Zhang and Donaldson, {Craig R.} and Cross, {Adrian W.} and Wenlong He",

note = "(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.",

year = "2016",

month = aug,

day = "31",

doi = "10.1109/TED.2016.2581314",

language = "English",

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journal = "IEEE Transactions on Electron Devices",

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AU - Garner, Jason R.

AU - Zhang, Liang

AU - Donaldson, Craig R.

AU - Cross, Adrian W.

AU - He, Wenlong

N1 - (c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

PY - 2016/8/31

Y1 - 2016/8/31

N2 - The design of a higher order mode (HOM) input coupler for a low-THz gyrotron travelling wave amplifier (gyro-TWA) 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 (75GHz to 110GHz) was manufactured. Vector Network Analyser (VNA) measured return loss of the HOM coupler is shown to be < 10dB at 90 – 96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the coupler.

AB - The design of a higher order mode (HOM) input coupler for a low-THz gyrotron travelling wave amplifier (gyro-TWA) 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 (75GHz to 110GHz) was manufactured. Vector Network Analyser (VNA) measured return loss of the HOM coupler is shown to be < 10dB at 90 – 96 GHz. A transmission and phase measurement is presented to analyse TE61 mode conversion in the coupler.

KW - Gyro-TWA

KW - mode coupling

KW - waveguide coupler

KW - THz input coupler

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DO - 10.1109/TED.2016.2581314

M3 - Article

SN - 0018-9383

VL - 63

SP - 3284

EP - 3290

JO - IEEE Transactions on Electron Devices

JF - IEEE Transactions on Electron Devices

IS - 8

ER -

Design study of a 372 GHz higher order mode input coupler

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Gyrotron Travelling Wave Amplifier for high field Electron Paramagnetic Resonance

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Design study of a 372 GHz higher order mode input coupler

Abstract

Keywords

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Gyrotron Travelling Wave Amplifier for high field Electron Paramagnetic Resonance

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