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Design of Broadband Circuit Analog Absorber With Optimal Thickness for Stable Angular Response in C, X, Ku, and K Bands

In this letter, a 2-layer thin wideband circuit analog absorber based on the concept of multiple resonances is realized with a thickness close to Rozanov's theoretical thickness. The absorber consists of circular loop arrays loaded with lumped resistors on FR4 substrate, backed by a metal plane...

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Bibliographic Details
Published in:IEEE transactions on electromagnetic compatibility 2023-12, Vol.65 (6), p.1-5
Main Authors: V P, Inbavalli, V P, Sakthivel, C, Venkatesh, Kumar T R, Suresh
Format: Article
Language:English
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Summary:In this letter, a 2-layer thin wideband circuit analog absorber based on the concept of multiple resonances is realized with a thickness close to Rozanov's theoretical thickness. The absorber consists of circular loop arrays loaded with lumped resistors on FR4 substrate, backed by a metal plane, with a thickness of 0.40 λ center (wavelength at the center frequency). The absorber offers 149% fractional bandwidth under normal incidence with a 10-dB reflectivity reduction in the frequency band of 3.6-24.6 GHz (C, X, Ku, and K bands). The structure is angularly stable for incidence angles up to 50° and 40° for TE and TM polarization, respectively. To analyze the resonances of the absorber, an equivalent circuit model is developed, and the results agree with the full-wave simulation. The designed absorber is validated with the measurements.
ISSN:0018-9375
1558-187X
DOI:10.1109/TEMC.2023.3298816