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| Investigation of Circular Comb Slow-Wave Structure of THz Backward-Wave Oscillators |
| Wang Zi-cheng① Lu De-jian①② Wang Li① Li Hai-qiang① Zhang Shi-jie① Xu An-yu① Hao Bao-liang① Song Pei-de① Dai Zhi-hao① |
| ①(Institute of Electronics, Chinese Academy of Science, Beijing 100190, China) ②(Graduate University of Chinese Academy of Science, Beijing 100039, China) |
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Abstract 3-D electromagnetic simulation software is used to calculate the dispersion and interaction impedance of circular comb Slow-Wave Structure (SWS) which works for Terahertz (THz) Backward-wave Oscillators (BWO). The results show that the inner radius of SWS is 0.175mm in the band of 430-570GHz, and the inner radius of SWS is 0.1mm in the band of 760-940GHz. The large radius of SWS is a great help for improving beam transmission. The interaction impedance of fundamental backward wave of the SWS is smaller than 1Ω is a good explain to the truth that the electronic efficiency of THz BWO is smaller than 0.01%.
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Received: 25 May 2007
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Corresponding Authors:
Wang Zi-cheng
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2008, Vol. 30 
