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Type: Journal article
Title: Metamaterial-inspired bandpass filters for terahertz surface waves on Goubau lines
Author: Karami Horestani, A.
Withayachumnankul, W.
Chahadih, A.
Ghaddar, A.
Zehar, M.
Abbott, D.
Fumeaux, C.
Akalin, T.
Citation: IEEE Transactions on Terahertz Science and Technology, 2013; 3(6):851-858
Publisher: IEEE
Issue Date: 2013
ISSN: 2156-342X
Statement of
Ali K. Horestani, Withawat Withayachumnankul, Abdallah Chahadih, Abbas Ghaddar, Mokhtar Zehar, Derek Abbott, Christophe Fumeaux and Tahsin Akalin
Abstract: This paper is focused on the application of split ring resonators (SRRs) to the design of compact bandpass filters for terahertz surface waves on single-wire waveguides, the so-called planar Goubau lines (PGLs). Through equivalent circuit models, electromagnetic simulations, and experiments, it is shown that, while a pair of SRRs coupled to a PGL inhibits the propagation of surface waves along the line, introducing a capacitive gap to the PGL switches the bandstop behavior to a bandpass behavior. In order to highlight the potential application of the proposed structure to the design of practical higher order terahertz bandpass filters, two types of compact bandpass filters are designed and fabricated: 1) third-order periodic bandpass filters based on SRR/gap-loaded PGL and 2) coupled-resonator bandpass filters. It is shown that, while the frequency response of the both filter types can be controlled by altering the physical dimensions of the structure, a wider bandwidth can be achieved from the coupled-resonator filters. The design concept and simulation results are validated through experiments.
Keywords: Bandpass filter
surface wave
terahertz Goubau line
Rights: © 2013 IEEE
DOI: 10.1109/TTHZ.2013.2285556
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Electrical and Electronic Engineering publications

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