Low-Observable Antennas: Radar Cross Section Reduction Techniques

Radar Cross Section (RCS) reduction of antennas refers to the methods and techniques used to minimize the amount of radar energy reflected back to a radar system by an antenna. RCS is crucial in stealth technology to reduce the detectability of antennas on platforms like aircraft, ships, or vehicles. RCS reduction has become a critical focus in antenna design, driven by the increasing demand for low observability in defence and civilian applications. Reducing the cross-sectional area of an antenna without significant loss in parameters can be achieved through various design techniques like use of Metamaterials (MM’s) enabling smaller structures, Shaping and Geometric Design, Use of Radar-Absorbing Materials (RAMs), Conformal Antenna Designs, Frequency Selective Surfaces (FSS), Low- Observable Radomes, Active Cancellation, Polarization Control etc. This paper provides a comprehensive analysis of the techniques and methodologies used to minimize the RCS of Patch antennas.