volume | PIER Journals

Abstract

This work presents a new compact split-ring resonator (SRR)-loaded rasorber to achieve narrow in-band transmission while maintaining broad absorption over a wide frequency range. The unit cell on the top layer is made up of four 150-ohm lumped resistors and four modified split ring resonators that are capable of absorbing a wide range of frequencies. The bottom FSS layer comprises a multilayer cascaded structure where top and bottom most metal layers are inductive grids, and the middle-sandwiched layer is a folded square ring structure. This design serves as a band-pass filter, allowing in-band transmission frequencies to pass through and also serving as a ground plane for out-of-band frequencies. The proposed rasorber exhibits an absorption bandwidth of 124% for frequency band starting from 2.5 GHz to 9.5 GHz, which covers mostly ISM and Satellite communication bands. The rasorber also acts as a transparent structure with insertion loss of 1.3 dB at the IOT band of 4.8 GHz. The novelty of the rasorber lies in achieving a very narrow transmission bandwidth with sharp roll off and is well suitable for radome applications having high selectivity. The innovation in this design comes from its combination of wide out-of-band absorption, narrow in-band transmission, high angular stability up to 50° for oblique incidence, and a dual-polarized response. The study looked at polarization behavior, surface current distribution, and other important parameters to figure out how well the rasorber worked. The equivalent circuit response of the proposed rasorber is compared with simulated one to get more circuit level understanding. Our results indicate that the electrical equivalent circuit design closely aligns with the simulated data. The proposed rasorber is suitable for secure communication in defense, as a super-stratum on an antenna, with reduced RCS and stealth characteristics.

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Dr. Abhinav Kumar

Mr. Gobinda Sen

Dr. Jayanta Ghosh