volume | PIER Journals

Abstract

In this paper, design of a triple band ultrathin compact polarization insensitive metamaterial absorber for S-, C- and X-band applications is proposed. The proposed absorber consists of periodic arrangement of a modified triple circular slot ring resonator as unit cell printed on the top of a continuous metal backed FR-4 dielectric substrate. The proposed absorber is ultrathin having thickness of λ₀/135.66 at the lowest absorption center frequency. The measured wide stable absorption bands of 0.40 GHz, 0.45 GHz and 0.47 GHz with absorption peaks of 97%, 96.45% and 98.20% at absorption center frequencies of 2.90 GHz, 4.18 GHz and 9.25 GHz respectively are observed. The temperature profile of absorber is measured by using lock in infrared thermography, and a temperature increase of 1°C at absorbing frequency as compared to non-absorbing frequency is observed. The absorber is demonstrated to be polarization insensitive to TE and TM polarized angles of incidence of electromagnetic wave with wide angular stability up to 45°. The absorber is fabricated and tested in an anechoic chamber. Experimental results agree well with measured ones.

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Dr. Amit Kumar Singh

Prof. Mahesh Pandurang Abegaonkar

Dr. Shiban Kishen Koul