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

Feifei Huo,Jianhui Bao,Fei Liu,Min Zhu,Chien-Jen Wang

doi:10.1155/2021/9576494

Abstract

The work presented in this paper concerns a method for the miniaturized frequency selective surface (FSS) based on the meander lines. A miniaturized dual-bandstop FSS structure based on meander lines with spiral-shape is proposed and simulated. The equivalent circuit and current distributions are introduced to explain the FSS performance. The size of the unit cell is 10 mm, which is about 0.037 wavelength at the first resonant frequency. Simulation results indicate that the proposed FSS has a frequency shift smaller than 1% for different polarizations with an oblique incident angle of 60°. A prototype of the FSS is fabricated and measured. The measurement results show that the FSS is polarization-insensitive and angle-insensitive.

Highlights

In the past few years, frequency selective surfaces (FSSs) have been used for a variety of applications, including absorbers [1, 2], radar stealth [3,4,5], communications [6,7,8], and other aspect [9,10,11] in the microwave, millimeter wave, and infrared wave
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 [16, 17], and the unit curling and interdigitating design [18,19,20,21,22,23]
To demonstrate the simulated performance, a prototype of the proposed double-layer FSS is fabricated and shown in Figure 7. e dimension of the fabrication is 200 mm × 200 mm, which contains an array of 20 × 20 unit cells

Summary

Introduction

In the past few years, frequency selective surfaces (FSSs) have been used for a variety of applications, including absorbers [1, 2], radar stealth [3,4,5], communications [6,7,8], and other aspect [9,10,11] in the microwave, millimeter wave, and infrared wave. With the increasing requirement of FSS technology, the traditional FSS cannot satisfy the practical application because the large unit size will lead to the premature production of the grating lobe when the elements resonant. Another reason is that traditional FSS is difficult to be applied in a limited space area or on irregular surfaces. 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. E proposed FSS comprises meander lines printed on a single-layer dielectric substrate, and the element size is about 0.065 wavelength at the resonant frequency. A prototype of the FSS is fabricated and measured, and the measurement results indicate that the proposed FSS is polarization-insensitive and angle-insensitive

Unit Cell Design and Simulation Results

Measurement Results

Conclusions