TST, Vol. 15, No. 2, PP. 31-39
(Invited paper) A Compact terahertz spoof surface plasmon polaritons transmission line
Huali Zhu 1, Yong Zhang 1*, Yang Chen 1, and Longfang Ye 2
1 Fundamental Science on EHF Laboratory, University of Electronic Science and Technology of China, Chengdu 611731, China;
2 Institute of Electromagnetics and Acoustics, School of Electronic Science and Engineering, Xiamen University, Xiamen 361005, China;
*1 Email: yongzhang@uestc.edu.cn
(Received June 2022)
Abstract: In this paper, a terahertz on-chip transmission line based on spoof surface plasmon polaritons (SSPPs) is proposed and demonstrated through advanced InP technology. In order to reduce the occupied area of the conventional grooves structure SSPPs, a folded structure SSPPs is employed. Simulated results show that the occupied area of the folded SSPPs is reduced by up to 70.2% compared with the conventional grooves SSPPs structure under the same asymptotic frequency. In addition, an efficient excitation of the folded SSPPs transmission line is realized by a ground coplanar waveguide (GCPW) through a gradient transition structure. Simulated results show that the insertion loss of the SSPPs transmission line is less than 2.25 dB/mm at the frequency of 300 GHz, and the return loss is better than 15 dB, which also has an inherent low-pass filtering feature. This work has great significance for the terahertz plasmons semiconductor integrated circuits.
Keywords: Spoof surface plasmon polaritons; Transmission line; InP technology; Terahertz; On-chip
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