Transmitting-absorbing material based on resistive metasurface

Fan-Guang Meng,Fei-Fei Li,Feng-Zhi Xue,Hao Li,Rui-Xin Wu,Ping Chen,Di-Gang Fan

doi:10.1063/1.5037772

Abstract

We theoretically and experimentally studied a transmitting-absorbing material that had transmission window within the absorption band. The material had a sandwich structure comprised of a resistive metasurface, a dielectric substrate and a metallic slot frequency-selective surface (FSS). The material showed lower reflectivity in a wide frequency range; the -10 dB absorbing bandwidth could be over 76% (64% in experiments). Meanwhile in the middle of the range the transmittance up to -1.7 dB was observed at about 10 GHz where slot FSS had good transparency. We showed the lower reflectivity of our material was mainly due to the absorption of incident radiation energy except for the transparent window where the radiation energy passed through the materials. The transmitting window could be adjusted by changing the geometry parameters of slot FSS. Our material had the advantages of thin thickness, small size of unit cell, convenient fabrication and easy to extend to other frequency bands. This kind of transmitting-absorbing material provided a new way for the applications, such as light harvesting, sensing and radome materials.

Highlights

Absorbing materials that are capable of absorbing and attenuating incident radiation have aroused much interest.[1]
We show the transparent window can be adjusted by changing the geometry parameters of the slot frequency-selective surface (FSS), and we discuss the effects of surface resistance of metasurface on the transmission and absorbing performances of the material
We have studied the transmitting-absorbing material that has a transparency window within a broadband absorption band

Summary

INTRODUCTION

Absorbing materials that are capable of absorbing and attenuating incident radiation have aroused much interest.[1] Effectively absorbing the power of incident radiation is ever growing in different aspects of ongoing technologies from radio to optical frequencies.[2,3] They are employed for sensing,[4,5] light harvesting,[6] thermo-photovoltaic[7] and reducing the electromagnetic interference among microwave components.[8] In military applications, they play key roles in reducing the radar signature of objects.[9,10] in certain applications, such as radome,[11] a simple absorbing incident radiation cannot meet the requirements in practical applications; the materials need good transparency at the frequencies for the transmitting antenna but effectively absorbing EM waves in the other frequencies This kind of application calls for materials with both absorbing and transmitting functionalities. The material has the advantages of thin thickness, small unit cell size, easy fabrication and low cost

STRUCTURAL DESIGN AND TRANSMISSION-ABSORPTION PERFORMANCES

EXPERIMENTAL VERIFICATION

Findings

CONCLUSION