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Resonant Coupling Effects in a Double-Layer THz Bandpass Filter

Authors :
Tao Gao
Feng Huang
Yanqing Chen
Weilin Zhu
Xuewei Ju
Xiangfeng Wang
Source :
Applied Sciences, Vol 10, Iss 15, p 5030 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

Cascading similar frequency selective surfaces (FSSs) improves the roll-off rate and frequency selectivity of THz bandpass filters. However, resonant coupling between FSS layers causes anomalous transmission peaks. In this work, we have employed an equivalent circuit model to analyze a double-layer FSS structure with periodic cross apertures at different interlayer spacing. We found that the anomalous peaks can be attributed to the resonant coupling between the upper and lower layer FSSs, and their periodic appearance with changing interlayer spacing is related to the half-wavelength repeatability of the circuit. We have fabricated a double-layer FSS sample using femtosecond laser micromachining and measured it using time-domain THz spectroscopy. The results using the equivalent circuit model agree with the Finite-Difference Time-Domain (FDTD) and experimental results.

Details

Language :
English
ISSN :
20763417
Volume :
10
Issue :
15
Database :
Directory of Open Access Journals
Journal :
Applied Sciences
Publication Type :
Academic Journal
Accession number :
edsdoj.2725379bb47e99e86f167251c5cb8
Document Type :
article
Full Text :
https://doi.org/10.3390/app10155030