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|Title:||Second-order terahertz bandpass frequency selective surface with miniaturized elements|
|Citation:||IEEE Transaction on Terahertz Science and Technology, 2015; 5(5):761-769|
|Amir Ebrahimi, Shruti Nirantar, Withawat Withayachumnankul, Madhu Bhaskaran, Sharath Sriram, Said F. Al-Sarawi, and Derek Abbott|
|Abstract:||In this paper, a second-order frequency selective surface (FSS) made of miniaturized elements is proposed and designed for terahertz applications. The FSS is composed of two layers of metallic arrays separated from each other by a polymer dielectric spacer. The unit cells on the front and back layers are smaller than λ₀/5 , where λ₀ is the free space wavelength. The operation principle of the proposed FSS is described through a circuit model, and a synthesis procedure is presented for designing a desired filtering response. A prototype of the FSS is synthesized to operate at a center frequency of 0.42 THz with 45% fractional bandwidth. The designed FSS is fabricated by using microfabrication process. The performance is evaluated by using terahertz time-domain spectroscopy. Measurement results show a low sensitivity of the FSS response to oblique angles of incidence for both of the TE and TM polarizations.|
|Keywords:||Bandpass filter; frequency selective surface (FSS); periodic structures; spatial filters; terahertz (THz); THz filter|
|Rights:||© 2015 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information|
|Appears in Collections:||Electrical and Electronic Engineering publications|
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