Scattering suppression with dual-band single-layer mantle cloak for cylindrical metasurface

Abstract

This paper investigates scattering suppression with a dual-band and single-layer mantle cloak by using the proper structure for cylindrical objects. The mantle cloak’s surface impedance is calculated according to the Mie Theory to obtain considerable scattering reduction at all angles of the cylinder. The analytical formulation assists in determining the proper unit cell dimensions to obtain design parameters. Firstly, the patch array geometry is applied on the mantle cloak for a single operating frequency with different unit cell numbers. Then a new design of a dual-band single-layer mantle cloak is made with the findings obtained. Simulations are conducted for both mantle cloaks, and bi-static Radar Cross-Section (RCS) analyses are carried out, generating simulated outcomes for cylinders that are both cloaked and uncloaked. The comparison of the scattering suppression between them reveals that the cloaked cylinders demonstrate a significant reduction in scattering. These achievements apply to both single-band and dual-band designs. A novel dual-band single-layer mantle cloak is presented with a new design method and scattering suppression is observed in more than one operating frequency. As evidence of the subject, a dual-band cloaked cylinder is designed with a total radius of 0.13λ0, a total length of 2.59λ0, and a thin dielectric layer’s thickness of 0.0127λ0(λ0i s the wavelength at design frequency f0=3 GHz). This dual-band cloaked cylinder has 7.6 dB absolute RCS reduction at f=2.05 GHz and 5.6 dB absolute RCS reduction at f=3.75 GHz. An efficient scattering suppression is achieved for these two different frequencies in all directions. The considerable degree of invisibility observed in this study opens up possibilities for future investigations in various fields, including radar applications, sensing applications, and antenna isolation for the purpose of blockage reduction.