Simplistic metasurface design approach for incident angle and polarization insensitive rcs reduction

K K Indhu; A P Abhilash; R Anilkumar; Deepti Das Krishna; C K Aanandan

doi:10.1038/s41598-024-72509-6

Simplistic metasurface design approach for incident angle and polarization insensitive rcs reduction

Sci Rep. 2024 Sep 20;14(1):21964. doi: 10.1038/s41598-024-72509-6.

Authors

K K Indhu¹, A P Abhilash², R Anilkumar², Deepti Das Krishna², C K Aanandan³

Affiliations

¹ Department of Electronics, Cochin University of Science and Technology, Cochin, 682022, India. indhukk@cusat.ac.in.
² Department of Electronics, Cochin University of Science and Technology, Cochin, 682022, India.
³ Advanced Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Cochin, 682022, India.

Abstract

This paper proposes the design of a metasurface for polarization and incident angle-insensitive RCS reduction applications. An ellipse-shaped unit cell is utilized as a polarization converter, which is then arranged to form a checkerboard surface. While a single layer checkerboard structure gives a wideband RCS reduction, a double layer structure yields polarization and incident angle independent operation. The two layers have unit cells rotated 45⁰ to each other. Experimental results demonstrate an RCS reduction bandwidth of around 90%. Further the RCS reduction remains stable with polarization and incident angle variation.

Keywords: Checker board reflective surface; Incident angle stability; Polarisation conversion ratio; Polarisation insensitive; Radar cross section reduction.