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A novel modified circular ring-based broadband polarization-insensitive angular stable circuit analog absorber (CAA) for RCS applications

Published online by Cambridge University Press:  07 March 2022

Mohammad Abdul Shukoor Open the ORCID record for Mohammad Abdul Shukoor [Opens in a new window]  and
Sukomal Dey Open the ORCID record for Sukomal Dey [Opens in a new window]
Mohammad Abdul Shukoor
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Palakkad, Palakkad, Kerala 678557, India
Sukomal Dey*
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Palakkad, Palakkad, Kerala 678557, India
*
Author for correspondence: Sukomal Dey, E-mail: sukomal.iitpkd@gmail.com
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Abstract

In this study, a compact modified circular ring-based circuit analog absorber (CAA) is proposed. It comprises a resistor-loaded frequency selective surface (FSS) underneath an FR-4 substrate, and the other end is terminated with a perfect electric conductor (PEC) separated by an air-spacer. The proposed design shows a minimum −10 dB reflectance from 10.55 to 36.03 GHz (25.48 GHz bandwidth and 109.4% fractional bandwidth) with two dips at 13.5 GHz and 35.23 GHz having reflectivity −17.18 dB and −24.9 dB, respectively. The existing four-fold circular symmetry architecture shows insensitivity for different polarization angles under normal incidences and up to 45° stability for Transverse Electric (TE) and Transverse Magnetic (TM) modes under oblique incidences. The proposed cell is compact with a periodicity of 0.193λL, and a thickness of 0.09λL, where λL is the free-space wavelength corresponding to the lowest frequency of the absorption band. The novelty of the design lies in the topology of using an underneath FSS to take advantage of effective permittivity control for both broader bandwidth and better angular stability. To demonstrate the ability of the proposed design, a 28 GHz microstrip patch antenna prototype is fabricated, and its radar cross section (RCS) is measured after loading with the absorber. A 15.15 dBsm RCS reduction is observed in comparison with the PEC. The authors strongly believe that the proposed design has potential applications such as RCS reduction and radio-frequency energy harvesting.

Keywords

Angular stabilitycircuit analog absorberfrequency selective surfacelumped resistorpolarization insensitive
Type
Metamaterials and Photonic Bandgap Structures
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 3 , April 2023 , pp. 440 - 453
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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