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Proceedings Paper

Transmission characteristics of 0.14 THz terahertz waves in metal overmoded waveguides
Author(s): Guang-qiang Wang; Jian-guo Wang; Xue-feng Wang; Chang-jiang Tong; Shuang Li; Xi-cheng Lu
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Paper Abstract

The transmission characteristics of cylinder and rectangular metal overmoded waveguides frequently used in 0.14 THz frequency band are numerically studied in this paper. At first, skin depths and losses of overmoded cylinder waveguides for different waveguide materials and terahertz wave modes are theoretically calculated and validated by electromagnetic finite difference time domain (FDTD) method. Loss as high as 5 dB/m is obtained for stainless steel and TM01 mode, and it increases with mode orders and decreases with waveguide radius. Also the mode conversion is observed in the straight overmoded cylinder waveguide with finite conductivity. Then transmission characteristics of overmoded rectangular metal waveguide including bend waveguides, straight waveguides, and transition waveguides are researched. The significant mode conversions in the overmoded E and H bend waveguides are found even ignoring the effect of finite conductivity. Only a few of the TE10 mode within frequency band of 0.13-0.16 THz is successfully transported through the standard bend waveguides in Ka band. The transmission characteristics of overmoded straight rectangle waveguide are almost the same as the cylinder one’s. Non-cutoff modes for the two waveguides connected by transition waveguide can transfer through it without losses, while the rest modes can’t.

Paper Details

Date Published: 23 August 2013
PDF: 7 pages
Proc. SPIE 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications, 890904 (23 August 2013); doi: 10.1117/12.2032213
Show Author Affiliations
Guang-qiang Wang, Northwest Institute of Nuclear Technology (China)
Jian-guo Wang, Northwest Institute of Nuclear Technology (China)
Xi’an Jiaotong Univ. (China)
Xue-feng Wang, Northwest Institute of Nuclear Technology (China)
Chang-jiang Tong, Northwest Institute of Nuclear Technology (China)
Shuang Li, Northwest Institute of Nuclear Technology (China)
Xi-cheng Lu, Northwest Institute of Nuclear Technology (China)


Published in SPIE Proceedings Vol. 8909:
International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications
Marco Rahm; Konstantin Vodopyanov; Wei Shi; Cunlin Zhang, Editor(s)

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