Compact, broadband, wide angular stable circuit analog absorber at sub‐6 <scp>GHz</scp> for <scp>radar cross section</scp> reduction

Shukoor, Mohammad Abdul; Dey, Sukomal

doi:10.1002/mop.32993

Cited by 15 publications

(5 citation statements)

References 22 publications

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“…In recent years, various of frequency selective surface (FSS)-based absorbers have been reported. These absorbers usually consist of metal square-loop with lumped resistors 9,10 or resistive film. [11][12][13] According to equivalent circuit model theory, these resistive FSS layers can be regarded as serial RLC or RC circuits.…”

Section: Introductionmentioning

confidence: 99%

A broadband flexible microwave‐optical compatible absorber

Zheng

et al. 2023

Micro & Optical Tech Letters

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In this paper, a broadband flexible absorber for compatible microwave-optical absorption is proposed. The absorber consists of two polyvinyl chloride (PVC) substrates and three resistive layers made of conductive carbon black (CCB).Two CCB layers are employed as the frequency-selective surface to achieve microwave absorption while the third one ensures high optical absorption.The PVC substrates provide the structure with good flexibility. An equivalent circuit model is presented to analyze broadband microwave absorption.Finally, the proposed structure is fabricated and tested. The total thickness of the absorber is only 4.05 mm. Simulation and measurement results show the proposed structure process wideband absorption over 90% in the frequency range from 6.24 to 19.8 GHz. The proposed absorber also shows a highefficient absorption in an optical band from 220 to 2500 nm. Experimental results verify the proposed absorber possesses compatible microwave-optical absorption. In addition, the proposed structure possesses compactness and flexibility characteristics, making it easy to conform which indicates its promising applications in stealth areas.

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Section: Introductionmentioning

confidence: 99%

A broadband flexible microwave‐optical compatible absorber

Zheng

et al. 2023

Micro & Optical Tech Letters

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“…In recent years, a series of methods to expand bandwidth and reduce thickness were proposed, such as using capacitive circuits, 2–4 multiple resistive layers, 5–7 and multi‐resonant structures 8–10 . In these methods, constructing multiple resistive layers is an effective way for two‐dimensional (2‐D) structure by carefully manipulating the resonant frequency of each resistive layer.…”

Section: Introductionmentioning

confidence: 99%

Design of a polarization‐insensitive three dimensional microwave absorber for ultra‐wideband RCS reduction

Zhang

Jin

et al. 2022

Micro & Optical Tech Letters

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A polarization‐insensitive three‐dimensional (3‐D) microwave absorber is proposed in this letter for ultra‐wideband radar section cross (RCS) reduction. The lossy layer of the designed absorber is evolved from the bent metallic strip with a center‐embedded resistor, which performs the property of absorption‐reflection‐absorption due to its multimode resonances. A short stub with a center‐embedded resistor is connected to the long‐bent strip to abolish the reflection performance, for the sake of achieving wide absorption performance. The fundamental working principle of the designed structure is explained adequately using an intuitive equivalent circuit model. Additionally, the absorber is designed, fabricated, and measured for validation, whose fractional bandwidths is 151.5% with at least 10‐dB RCS reduction.

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“…Circuit analogue absorber (CAA) is an effective approach for broadband absorption. The narrow bandwidth issue is resolved by choosing a suitable lumped resistor equivalent that turns the metallic layer as a high impedance surface (HIS) over the broad range 20 . In CAAs, the non‐zero reactive part of the impedance adjusts resonant frequencies for uniform absorption 21 .…”

Section: Introductionmentioning

confidence: 99%

“…The narrow bandwidth issue is resolved by choosing a suitable lumped resistor equivalent that turns the metallic layer as a high impedance surface (HIS) over the broad range. 20 In CAAs, the non-zero reactive part of the impedance adjusts resonant frequencies for uniform absorption. 21 A single-layered dual octagonal loop CAA loaded with eight lumped resistors for X and Ku-band (having 73.68% fractional bandwidth [FBW] and 20 angular stability) is illustrated in Li et al 22 Ghosh et al proposed a multilayer squared array CAA with 12 lumped resistors loaded on the unit cell, exhibiting broadband absorption from 4.96 to 18.22 GHz with 114% fractional bandwidth.…”

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confidence: 99%

Broadband polarization insensitive wide angular stable dual‐split square ring circuit analog absorber for radar cross section and electromagnetic interference shielding applications

Shukoor

Dey

Koul

2022

Int J RF Mic Comp-Aid Eng

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This work presents a simple broadband polarization-insensitive circuit analog absorber (CAA) with wide angular stability. It comprises of dual-cut square loop resonator loaded with eight lumped resistors as top patch and an inductive grid. The normal incidence reveals a 90% absorption bandwidth of 20.51 GHz (110% fractional bandwidth) covering the entire X to K-band with a minimum flat absorption rate of 92.82%. Equivalent circuit analysis is carried out, and responses are validated with full-wave simulations. The proposed prototype is insensitive to different polarization angles under normal incidence and stable with 45 in transverse electric (TE) and transverse magnetic (TM) incidences. The design's novelty lies in using two resistors on each side of the square ring, which improves the absorptivity performance. The inductive grid enhances TM mode's angular stability. The proposed absorber is fabricated, and the measured results are in good agreement. In-band bistatic radar cross section reduction of 12.97 dBsm is obtained with the absorber using an X-band antenna. The temperature profile of the prototype is illustrated using near-in-lock infrared thermography, and 2.1 F of temperature rise is noticed in the absorption band. The proposed structure possesses a low profile, broad bandwidth, polarization insensitivity, and wide angular stability to the best of the author's knowledge.absorber, broadband, IR imaging, lumped resistor, radar cross section | INTRODUCTIONElectromagnetic (EM) wave absorption has gained significance in applications like RF energy harvesting, photodetectors, micro-bolometers, biological image sensing, EM shielding, and radar cross section (RCS) reduction in stealth technology. 1 Salisbury screen was the first traditional microwave absorber, 2 consisting of a flat resistive sheet coated on a λ g =4 ground dielectric spacer. Dependence of effective impedance on substrate thickness confines Salisbury screen to a narrow band. Jaumann absorber, 3 where stacking of different resistive on λ g =4 spacers was proposed for uniform absorption over a wideband. However, the physical size of the Jaumann screen is limiting its usage. Earlier, the EM wave absorption were also focused on pyramidal foam absorbers, carbon

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Compact, broadband, wide angular stable circuit analog absorber at sub‐6 GHz for radar cross section reduction

Cited by 15 publications

References 22 publications

A broadband flexible microwave‐optical compatible absorber

A broadband flexible microwave‐optical compatible absorber

Design of a polarization‐insensitive three dimensional microwave absorber for ultra‐wideband RCS reduction

Broadband polarization insensitive wide angular stable dual‐split square ring circuit analog absorber for radar cross section and electromagnetic interference shielding applications

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