Ultra-wideband hybrid polarization conversion-absorption metasurface with a transmission window and narrow transition bands

Abstract

This paper proposes an ultra-wideband hybrid polarization conversion-absorption (PCA) metasurface with a transmission band for radar cross section (RCS) reduction application. To achieve the in-band transmission of the incident wave and the out-of-band suppression of the scattering wave, the proposed metasurface is composed of a low-frequency PCA array, a high-frequency polarization conversion (PC) array, and a second-order frequency selective surface (FSS). The lumped resistors are used in the PCA array to generate the absorption characteristic, thus giving rise to the reduction of the co-polarization component of the scattering field and meanwhile the elimination of the high-frequency resonances. An interdigital structure is introduced into the PCA array to not only achieve a good transmission for a co-polarization component of the incoming wave but also result in an extra PC band for narrowing the transition band between the transmission window and the high-frequency PCA band. The orthogonal layout of the PCA array and the PC array is used to decrease the interaction between them, thus resulting in an ultra-wideband PCA band. The second-order FSS consisting of a stacked structure is designed to generate a good passband with the steep roll-off and the good out-of-band suppression. The proposed metasurface has an ultra-wideband PCA band, a good transmission band, and narrow transition bands. When the proposed metasurface is arranged into an array in a rotation way, the ultra-wideband RCS reduction performance can be obtained. Simulated and measured results are given to demonstrate a 10 dB RCS reduction band of 3.4-24.6 GHz with a -1 dB transmission band of 8.45-10 GHz.

Design of Broadband and Ultra-Wide-Angle Low-RCS Open-Ended Cavity Based on Phase Cancellation

“…After that, the units before and after rotation are arranged alternately or placed in a checkerboard pattern to accomplish effective RCS reduction. Despite extensive research on PCM [28][29][30][31][32], there has been no research on the application of PCM to the field of EOC's RCS reduction, according to our investigation.…”

“…However, absorbing materials are typically expensive and tend to fail at high temperatures. The metasurface offers a novel technique for RCS reduction that distributes energy in the direction away from the threat by manipulating the wavefront [21][22][23][24][25][26][27][28][29][30][31][32]. However, metasurfaces are relatively rarely used to regulate the scattering of cavities [23].…”

Ultra-wideband and wide-angle RCS reduction of a concave structure based on a chessboard polarization conversion metasurfaces

“…As shown in figure 1(a), the arc-shaped concave structure has a radius of R = 360 mm, a curve edge length of L c = 384 mm, and a straight edge of L s = 384 mm. To facilitate the loading of the metasurface to effectively achieve RCS reduction, the arcshaped concave structure shown in figure 1 To reduce the RCS of the COLP, this can be achieved by employing destructive interference to regulate the scattering according to the array theory [23]. Implementing this method is strongly supported by the advancement of PCM.…”

“…The chessboard polarization conversion metasurface (CPCM) offers a novel idea for RCS reduction that manipulates the wavefront to transfer energy away from the directions of threats [19][20][21]. The suggested CPCM is arranged as a chessboard of polarization conversion metasurfaces (PCM) [20][21][22][23], which consists of a classic sandwich structure with air substrates. According to our retrieval, CPCM has not been applied to the field of concave surface RCS reduction, despite the fact that CPCM has been widely studied.…”

A 1-bit electronically reconfigurable beam steerable metasurface reflectarray with multiple polarization manipulations

“…Owing to the use of the ground, the transmission coefficients T xy and T yy are zero. It is worth pointing out that the PRPCR, which is different from the conventional polarization conversion rate (PCR), i.e., |R xy | 2 , [24,25] represents the ratio of the cross-polarized reflection wave to the total reflection wave regardless of the loss effect of the unit cell, and thus can better demonstrate anisotropic characteristic. As shown in Fig.…”