Dual Transmissive Frequency Selective Rasorber Designed Using Minkowski Fractal Shaped Resonator∗

Abstract

In this paper, a novel design strategy for realizing a polarization-independent and compact absorption-transmission-absorption-transmission type frequency selective rasorber (FSR) is presented. A resonator with cross-loop slot in the Minkowski fractal (MF) design is studied and incorporated within the top resistive layer of the square loop broadband absorber. The proposed MF resonator incorporated within the resistive layer is capable of realizing a dual transmission pole inside the broad absorption band. A cross slot based bandpass layer is replaced with the ground layer of absorber as such the desired transmission bands are achieved, while acting as ground plane outside the passbands. The proposed FSR design realizes two transmission windows at 10.4 and 15.2 GHz with the adjacent absorption bands from 5.2 to 10.1 GHz and 10.7 to 14.4 GHz. Measurements carried on the fabricated 15 x 15 array prototype experimentally validates the design. The proposed rasorber is a suitable contender for shielding and radar cross section reduction of the dual-band radiating systems. © 2022 IEEE.