Investigation of Thin Absorber With Big Incident Angle Absorption and RCS Reduction

Abstract

To achieve broadband electromagnetic wave absorption for airborne equipment, an absorber with a sandwich structure has been investigated. The top layer consists of a dielectric substrate that serves as phase compensation. The impedance-matched layer is situated in the middle, where a square ring and cross-shaped patch patterns made of indium tin oxide film are put on. At the bottom, a dielectric layer functions as a reflector. Based on the compensation and multiresonance principles, a big incidence angle and broadband absorptions have been achieved in both transverse electric (TE) and transverse magnetic (TM) polarization cases. The experiment results illustrate the absorptivity of more than 80% at 70° oblique incidence in X- and Ku-bands. The average radar cross-section reduction is more than 6 dB. Other excellent performances have been obtained even under conformal conditions. Significantly, it can enhance the stealth property of airborne equipment.