Study on dispersion characteristics of terahertz waves in helical waveguides

doi:10.1088/1674-1056/aba098

Abstract

Corresponding to the atmospheric transmission windows of the electromagnetic spectrum in the low terahertz range, the mode coupling and dispersion characteristics of two helically corrugated waveguides (HCW) in the frequency ranges of 90 GHz–100 GHz and 260 GHz–265 GHz are studied. Through analytic calculations and numerical simulations, dispersion curves and structural parameters of the two frequency ranges waveguides are obtained. A novel method was proposed to obtain the dispersion of the HCW from the eigenwave solution using a periodic boundary condition. The HCW in a frequency range of 90 GHz–100 GHz was fabricated and its dispersion performance was measured. By comparing the measured results with the theoretical and the simulated results, the validity of the analytical and simulation method is verified. Limited to our machining capability, the dispersion of the 260 GHz–265 GHz HCW was only simulated and calculated and it was found that the results agree well with each other.

Keywords: coupling coefficient dispersion curves gyrotron traveling wave tube (gyro-TWT) helical waveguide

Received: 28 May 2020
Revised: 22 June 2020
Accepted manuscript online: 29 June 2020

Corresponding Authors: ^†Corresponding author. E-mail: jinhaisun@126.com

Cite this article:

Jin-Hai Sun(孙金海), Shao-Hua Zhang(张少华), Xu-Tao Zhang(张旭涛), He Cai(蔡禾), Yong-Qiang Liu(刘永强), and Zeng-Ming Chao(巢增明)$ Study on dispersion characteristics of terahertz waves in helical waveguides 2020 Chin. Phys. B 29 114301

Fig. 1.

Dispersion of the 90 GHz–100 GHz HCW, the black curve is theoretically calculated result, the light blue circle is the simulation result using CST Microwave Studio.

Fig. 2.

Electric field pattern of the coupling electromagnetic mode.

Fig. 3.

Dispersion of the 260 GHz–265 GHz HCW, the black curve is theoretically calculated result, and the light blue circle is the simulated result using CST Microwave Studio.

Fig. 4.

A picture of 90 GHz–100 GHz HCW.

Fig. 5.

Experimental setup of dispersion characteristics of 90 GHz–100 GHz HCW.

Fig. 6.

Schematic diagram of the setup used in the dispersion measurement.

Fig. 7.

Schematic diagram of short axis position of the circular polarizers to produce (a) the right-handed circular wave and (b) the left-handed circular wave.

Fig. 8.

Dispersion curves of the 90 GHz–100 GHz HCW. The black curve is the calculated value, the light blue circle is from the simulation, and the blue curve is from the Vector Network Analyzer measurement.

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