Abstract
A frequency selective rasorber (FSR) with enhanced angular stabilities is presented in this letter. Using the theory of scan compensation, a dielectric matching layer (DML) is added on top of the FSR structure. Consequently, the proposed DML-FSR consists of three layers: a dielectric matching layer at the top, a lossy layer in the middle, and a lossless layer at the bottom to generate the absorption band and transmission band, respectively. Simulation and measurement show that under normal incidence, the -3 dB transmission bands are from 9.1 to 9.8 GHz and 9.6 to 10.5 GHz respectively. The simulated and measured minimum insertion loss is 0.26 dB and 0.36 dB at 9.5 GHz and 10.1 GHz, respectively. The simulated and measured absorption band with |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | < -10 dB ranges from 3.8 to 15.3 GHz and 3.8 to 16.6 GHz, respectively. When the oblique incident angle increases to 45°, the transmission band and absorption band can maintain good stabilities under both TE and TM polarizations. The proposed DML-FSR can achieve a wide absorption band located on both sides of the transmission band with improved angular stabilities. It has great potential in practical applications such as stealth radar platforms and anti-interference systems.
Published Version
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