Bandwidth enhancement of resonating absorber using a lossy dielectric layer for RCS reduction in X-band

Inbavalli V. Palaniappan; SureshKumar T. Rajamanickam; Sakthivel V. Ponnuvel; Venkatesh Chakrapani

doi:10.1515/freq-2024-0290

Article

Bandwidth enhancement of resonating absorber using a lossy dielectric layer for RCS reduction in X-band

Inbavalli V. Palaniappan , SureshKumar T. Rajamanickam , Sakthivel V. Ponnuvel and Venkatesh Chakrapani

Published/Copyright: January 6, 2025

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From the journal Frequenz Volume 79 Issue 5-6

Abstract

In this paper, a resonating absorber is proposed for radar cross section reduction in the X-band, with the inclusion of a high loss dielectric layer. The absorber consists of a pair of co-centered resonating Jerusalem cross printed on a FR4 substrate cascaded with a high-loss dielectric layer and a metallic back plane. The designed absorber offers 90 % absorption from 7.8–12 GHz with a fractional bandwidth of 42.42 %. The designed absorber is 0.106λ_L thick with a compact square unit cell of size 0.076λ_L (wavelength at the lowest frequency). An equivalent circuit model is developed to analyze the proposed absorber. The absorber is angularly stable for varying angle of incidences up to 40°–60° for TE and TM polarizations respectively. The planar as well as the conformal structure of the proposed absorber offer a minimum 10 dB radar cross section reduction in the X-band. The conventional approach which involves complex fabrication process of soldering thousands of lumped resistors to increase the bandwidth, whereas the proposed absorber is realized to offer wide absorption using simple PCB etching technique. To validate the design prototype is fabricated and the measurement is carried out.

Keywords: circuit analog absorber; frequency selective surface; Jerusalem cross; perfect absorber; radar cross section

Corresponding author: Inbavalli V. Palaniappan, Department of ECE, Pavai College of Technology, Namakkal, Tamil Nadu 637018, India, E-mail: inbavalli@gmail.com

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Use of Large Language Models, AI and Machine Learning Tools: None declared.
Conflict of interest: The author states no conflict of interest.
Research funding: None declared.
Data availability: Not applicable.

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Received: 2024-09-16

Accepted: 2024-12-20

Published Online: 2025-01-06

Published in Print: 2025-06-26

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Articles in the same Issue

https://doi.org/10.1515/freq-2024-0290

Keywords for this article

circuit analog absorber; frequency selective surface; Jerusalem cross; perfect absorber; radar cross section