Terahertz FSS for space borne passive remote sensing application

Abstract

A terahertz frequency selective surface (FSS) which operates inside the spatial filtering front-end of a high sensitivity receiver is proposed and experimentally verified. To achieve this terahertz FSS metamaterial which exhibits extremely low insertion loss and is insensitive to the variations of polarisations and incident angles, the FSS array is constructed by an electrically thick SiO 2 layer (quartz wafer) and an ultra-thin high conductivity aluminium layer with periodic aperture unit cells. The micro-machined metallic pattern is shaped by the combination of a sub-wavelength circular ring and a split-ring resonator. Experimental results and predicted spectral responses are shown to be in good agreement over the frequency range of 0.1-0.5 THz.

An FSS‐employed UWB antenna system for high‐gain portable devices

“…An array of metallic patches or grid type elements having band‐pass or band reject response is referred to as FSS. FSS finds their wide spread applications in antenna radomes, reduction in radar cross section, remote sensing and satellite communication services . They can also be employed as high‐impedance surfaces (HIS) in the form of superstrate or etched on the antenna substrate for the performance enhancement of antennas including bandwidth, gain, and directivity.…”

“…FSS finds their wide spread applications in antenna radomes, 1 reduction in radar cross section, 2 remote sensing and satellite communication services. 3,4 They can also be employed as high-impedance surfaces (HIS) in the form of superstrate or etched on the antenna substrate 5 for the performance enhancement of antennas including bandwidth, gain, and directivity. Moreover, they may also be employed to alter the polarization state of an antenna.…”

Comparative Study of Sub-THz FSS Filters Fabricated by Inkjet Printing, Microprecision Material Printing, and Photolithography

“…Advances in photolithography techniques and demand for lowloss THz signal conditioning have led to commercial availability of bandpass and lowpass FSS filters operating upto 20 THz [8]. The highest frequency of micromachined devices normally extends upto 0.5 THz [9]. Some techniques combine micromachining (with tolerances of ±1 μm), and wafer coating technologies to fabricate sub-THz FSSs [9].…”

“…The highest frequency of micromachined devices normally extends upto 0.5 THz [9]. Some techniques combine micromachining (with tolerances of ±1 μm), and wafer coating technologies to fabricate sub-THz FSSs [9]. Advanced micromachining in silicon, in combination with photolithography, allowed fabrication of a 0.7 THz FSS filter with <0.3 dB insertion loss [10].…”

All-dielectric metamaterial frequency selective surfaces based on high-permittivity ceramic resonators

“…All-dielectric metamaterial frequency selective surfaces based on high-permittivity ceramic resonators Liyang Li, 1 Jun Wang, 1 Jiafu Wang, 1 Hongliang Du, 1 Hao Huang, 1 Jieqiu Zhang, 1 Shaobo Qu, 1,a) and Zhuo Xu 2 1 College of Science, Air Force Engineering University, Xi'an 710051, Shaanxi, China In this letter, we propose the design of all-dielectric metamaterial frequency selective surface (FSS) using high-permittivity ceramics. The FSS is composed of 2D arrays of rectangular ceramic resonators.…”