volume | PIER Journals

Abstract

This manuscript presents a simple, novel design of a dual broadband absorber with merged double bands and double-split concentric ring resonators in each quadrant-based metamaterial absorber (DBBMDBMMA). The proposed structure exhibits two experimentally validated absorptance broadbands; one extending from 7.73 GHz-9.54 GHz and the other extending from 10.65 GHz-13.27 GHz. The two broadbands cover X-band and Ku-band, respectively. The DBBMDBMMA is fabricated on a double-sided FR4 copper plate with electrical dimensions of 0.5λ_o × 0.5λ_o × 0.05λ_o (λ_o at 8.5 GHz). The unit cell of the metamaterial absorber consists of concentric double split-ring resonators in each quadrant, with splits oriented vertically opposite and separated by a 90° inclination difference. The novelty lies in the response and design of the proposed structure that exhibits dual broadbands extending in two microwave bands without using parasitic elements, a multilayered structure, or an extended substrate width. The response of the DBBMDBMMA structure is stable with variation in incidence and polarization angle. The metamaterial behaviour is studied in terms of effective values of normalized matched impedance, permeability and permittivity. The proposed DBBMDBMMA exhibits reflectance of -21.62 dB at 8.59 GHz, -26.18 dB at 8.88 GHz, -15.11 dB at 11.24 GHz, and -18.63 dB at 12.86 GHz. The first absorptance peak is contributed by outer split-ring resonators in quadrants II and IV; the second absorptance peak is contributed by outer split-ring resonators in quadrants I and III; the third absorptance peak is contributed by inner split-ring resonators in quadrant II and IV; and the fourth absorptance peak is contributed by inner split-ring resonators in quadrants I and III. The proposed DBBMDBMMA structure exhibits polarization and wide incident angle insensitive response that finds applications in stealth technology and RCS reduction.

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Dr. Supriya

Dr. Alkesh Agrawal

Dr. Bhagwant Singh

Dr. Vijay Tiwari