Design of a Compact Passband Frequency Selective Surface with Stable Resonance

Abstract

We propose a compact planar passband frequency selective surface (FSS) operating at the resonance frequency of 3.81 GHz. The proposed FSS is composed of single layer of the Archimedean spiral type with the interdigital capacitance between the corners of metallic patches printed on one side of the substrate. Compared to the operating wavelength, the size of the proposed single layer FSS is 0.066 0 ( 0 is the free space wavelength at 3.81 GHz). The performance such as transmission and reflection coefficient of the proposed FSS demonstrates excellent resonance stability for different polarization and different incident angles. Finally, the optimized simulated results are validated with measured results by a fabricated prototype of 31 × 31 array elements on 170 × 170 mm 2 substrate area.

Performance enhancement of an ultra‐wideband antenna using a compact topology optimized single frequency selective surface‐layer as a reflector

“…In References 19, 20, authors have used multilayer FSSs to generate a multi‐stop‐band structure with a wide band property to enhance the gain but at the same time it increases both design profile and complexity. A convoluted circular FSS unit cell, alongside an interwoven with a convoluted element from a simple spiral dipole array, have been proposed by authors of References 21, 22 to achieve the desired miniaturization and frequency stability 23,24 aspects of an FSS array. In Reference 15, the authors proposed a novel and an attractive cylindrical antenna for microwave radiology imaging (MRI) applications, where an in‐phase FSS‐based reflector is introduced to the main UWB antenna, to enhance both the bandwidth and the front to back ratio, resulting in a well‐performing antenna, operating over a wide bandwidth ranging from 7.8 to 15 GHz, and a bore‐sight gain varying from 2 dBi up to 6 dBi.…”

Design of Miniaturized and Polarization-Insensitive Double-Layer Frequency Selective Surface Based on Meander Lines

“…Miniaturized FSS can be used to overcome the above difficulties. Many methods are employed to achieve the purpose of unit size reduction, including the coupling technology based on the capacitive surface and inductive surface [13][14][15], loading with passive lumped elements (capacitors and inductors) [16,17], and the unit curling and interdigitating design [18][19][20][21][22][23]. In [18], a convoluted structure is used for miniaturized FSS, and the element size is about 0.08 wavelength of the free-space.…”

“…In [18], a convoluted structure is used for miniaturized FSS, and the element size is about 0.08 wavelength of the free-space. In [19], a miniaturized FSS is single layer and composed of the Archimedean spiral type with the interdigital capacitance between the corners of metallic patches, and the element size is about 0.066 wavelength at the resonant frequency. In [20], a miniaturized dual-band FSS with closely spaced resonance is proposed.…”