A Frequency Selective Rasorber by Engineering Transverse Standing Waves of Surface Current

Xiaofeng Wang,Jiaheng Yang,Mingbao Yan,Jiafu Wang,Shaobo Qu,Hua Ma

doi:10.1109/access.2021.3061769

Abstract

The low RCS level out of operating band is urgent for radome while keeping its communication window. To solve this problem, we propose a frequency selective rasorber (FSR) that exhibits a pass-band between two absorption bands in this paper. The surface currents on a finite metallic wire media is analyzed firstly to elaborate transverse standing waves mechanism. High-efficiency and broadband absorption can be achieved by loading lumped resistors at high amplitude of standing waves. By delicately engineering the transverse standing waves versus frequency, a transparent window can be opened within an absorption wideband and it can be modulated by adjusting structural parameters. The transparent window centered around 10.0 GHz in the absorption band from 5.8 GHz to 18.0 GHz. Prototypes were fabricated and measured. Both the simulated and measured results show that for both x- and y-polarized waves, insertion loss of the transparent window at 9.85 GHz is below 0.2 dB while the absorption is above 90% in the two sidebands of 5.8-7.8 GHz and 11.8-18.0 GHz. Furthermore, the rasorber can also work well under oblique incidence angles up to 45 degrees. This work may find wide applications in electromagnetic compatibility, stealthy radomes, etc.

Highlights

The field of metamaterial, both in theory and in design, has got a huge progress in the past several decades
With the deepening of research, the metamaterial theory has been applied to practical design aspects like radar cross section (RCS) reduction [1]–[9], electromagnetic wave transmission enhancement [12]
Instead of focusing on longitudinal standing waves as in the design of conventional absorbers, we put our attention to engineering transverse standing waves of surface currents formed on metallic structures and propose a frequency selective rasorber (FSR) with customized transparent window

Summary

INTRODUCTION

The field of metamaterial, both in theory and in design, has got a huge progress in the past several decades. Many wideband absorption designs have been reported [2]–[4] On this basis, researchers further proposed absorptive/transmissive frequency selective. X. Wang et al.: FSR by Engineering Transverse Standing Waves of Surface Current band. Sun et al [5] propose to achieve wideband absorption based on longitudinal standing wave modulation. Resonant structures are stacked in the longitudinal direction according to the wavelength at a specific resonant frequency point This design is similar to Jauman Screen [25]. Instead of focusing on longitudinal standing waves as in the design of conventional absorbers, we put our attention to engineering transverse standing waves of surface currents formed on metallic structures and propose a frequency selective rasorber (FSR) with customized transparent window. This work provides a novel method to design FSR and may find wide applications in anti-interference communications, electromagnetic compatibility, stealthy technologies and others

DESIGN THEORY ANALYSIS

CONCLUSION