NDLI: Terahertz rectangular corrugated transmission line with Gaussian mode filtering for DNP-NMR

Content Provider	IET Digital Library
Author	Pu, Hong Du, Chao Hai Huang, Tie Jun Pan, Shi Liu, Pu Kun
Abstract	Gyrotrons have been developed as terahertz wave sources in dynamic nuclear polarisation (DNP) system to increase the sensitivity of nuclear magnetic resonance (NMR) in the high-magnetic field regime. However, the transmission of the Gaussian beam from the gyrotron output window to the NMR system proves to be a critical challenge. In this study, a terahertz transmission system, composed of a rectangular corrugated waveguide and a back-to-back rectangular corrugated horn for Gaussian mode filtering, is proposed. The attenuation in the optimised 0.33 THz corrugated waveguide remains lower than 0.01 dB/m in a broad frequency range from 280 GHz to 450 GHz. Besides, the coupling coefficient from the electric field in the 0.33 THz mode-filtering horn to the fundamental HE11 mode in the rectangular corrugated waveguide is obtained nearly 99.5%. This terahertz transmission system is potential to be applied in DNP-NMR spectrometer based on continuous wave gyrotrons.
Starting Page	2080
Ending Page	2084
Page Count	5
ISSN	17518725
Volume Number	12
e-ISSN	17518733
Issue Number	Issue 13, Oct (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/12/13
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2018.5064
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2018-07-20
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Back-to-back Rectangular Corrugated Horn Continuous Wave Gyrotrons Coupling Coefficient DNP-NMR Spectrometer Dynamic Nuclear Polarisation System Electric Field Electromagnetic Wave Attenuation Electromagnetic Wave Polarisation Electromagnetic Wave Propagation Filtering Method in Signal Processing Filtering Theory Gaussian Beam Gaussian Mode Filtering Gyrotron Output Window Gyrotrons High-magnetic Field Regime Nuclear Magnetic Resonance Rectangular Corrugated Waveguide Rectangular Waveguide Terahertz Rectangular Corrugated Transmission Line Terahertz Transmission System Terahertz Wave Source Transmission Line Transmission Line Theory Waveguide And Microwave Transmission Line
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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