Dual-Polarized Frequency Selective Rasorber With Two Transmission Bands

Ximeng Zhang,Jingjian Huang,Yuan Ye,Weiwei Wu,Weike Zhang,Naichang Yuan

doi:10.1109/access.2019.2942196

Ximeng Zhang, Jingjian Huang + Show 4 more

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Journal: IEEE Access	Publication Date: Jan 1, 2019
Citations: 22	License type: CC BY 4.0

Affiliation: National University of Defense Technology

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This paper presents a novel dual-polarized frequency selective rasorber (FSR) with two transmission bands and two absorption bands. The FSR is a 2-D structure which is composed of a lossy and a lossless frequency selective surface (FSS) layer. The unit cells of the lossy and FSS layer are both arranged to hexagonal periodic structures. The unit cell of the lossy layer is a combination of a loop with loaded resistors and three folded loops. The loop with resistors is located in the center of the unit cell, and surrounded by three folded loops. The equivalent circuit model shows that the two transmission poles are generated by two parallel LC circuits. The two absorption bands located at the lower side of the first transmission pole and between the two transmission poles are generated by series resonances. The FSR realizes two transmission poles at 6.1 GHz and 10.1 GHz, respectively. The reflection coefficient lower than −10 dB ranges from 3.24 to 10.5 GHz. The lower and higher absorption bands with absorption rates greater than 80% range from 3.3 to 4.97 GHz and 7.42 to 9.03 GHz, respectively. A prototype is fabricated and measured to validate our design and the measurement results match well with the simulation results.

Highlights

Frequency selective surfaces (FSSs) are periodic metallic arrays that can be designed to exhibit bandstop or bandpass responses [1]
FSSs allow electromagnetic (EM) waves to pass through the antenna operating band, and monostatic radar cross section (RCS) reduction can be achieved by reflecting EM waves to other directions
The two absorption bands are obtained by series resonances of the lossy layer, and the energy is absorbed by three resistors, which are loaded on the central loop

Summary

Introduction

Frequency selective surfaces (FSSs) are periodic metallic arrays that can be designed to exhibit bandstop or bandpass responses [1]. To solve the problem of the increase in interference or RCS caused by reflected waves, a dualband FSR (A-T-A-T) was first proposed in [28], where the lossy layer is composed of traditional center-connected unit cells with lumped elements. A dual-polarized FSR with two transmission bands and two absorption bands realized with one loop and three folded loops is proposed.

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