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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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Published in: | IEEE transactions on electromagnetic compatibility 2023-12, Vol.65 (6), p.1-5 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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. |
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ISSN: | 0018-9375 1558-187X |
DOI: | 10.1109/TEMC.2023.3298816 |