Circular configuration of perforated dielectrics for ultra-broadband, wide-angle, and polarisation-insensitive monostatic/ bistatic RCS reduction

Abstract

Here, a new strategy of ultra-broadband monostatic and bistatic radar cross-section reduction (RCSR) was theoretically investigated. A circular configuration of perforated dielectrics, as the coating layer, was designed to have full control on the bistatic RCS signatures of flat metallic objects. Using the proposed phase cancellation method, a customised level of bistatic RCSR (BRR) as well as operating frequency bandwidth were interpretively achieved. The presented study offered a robust and straightforward RCSR technique which does not rely on conventional blind optimisations. The coating layer was capable of reducing the monostatic and BRR of > 10 dB in a broad frequency range from 8.3 to 23.1 GHz (BW = 94%). The results were significantly improved compared to those of preceding researches. Besides, unlike the preceding researches, the performance of the designed coating layer was analytically justified under TE and TM polarisations of oblique incidences. A good agreement was observed between numerical simulations and theoretical predictions, confirming the polarisationindependent feature of the designed stealth coating layer for incident angles up to 60°. These superior performances and the flexibility of design guarantee the applicability of the proposed RCSR approach for various stealth applications.