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Journal Article Design of Electromagnetic Wave Absorber Using Periodic Structure and Method to Broaden its Bandwidth Based on Equivalent Circuit-Based Analysis
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Authors
Dong-Uk Sim, Jong-Hwa Kwon, Young-Jun Chong, Seong-Ook Park
Issue Date
2015-01
Citation
IET Microwaves, Antennas and Propagation, v.9, no.2, pp.142-150
ISSN
1751-8725
Publisher
IET
Language
English
Type
Journal Article
DOI
https://dx.doi.org/10.1049/iet-map.2013.0487
Project Code
14MR2600, A Study on Health Effects and Protection of EMF, Kwon Jong Hwa
Abstract
A new broadband electromagnetic wave absorber based on a periodic surface and a method to increase its absorption bandwidth is proposed. The proposed absorber structure shows broadband characteristics, and its bandwidth is improved by generating additional resonances through a reasonable approach. To provide an understanding of the logical design procedure, an analytical method to determine the sheet resistance and new equivalent circuit models for analysing the impedance are both presented. From the analysis, it is shown that the exact range of the sheet resistance corresponding to the desired absorption level can be efficiently estimated for the resonance of the structure. For the verification of this approach to obtain an efficient design, as well as the functionality of both the absorber and the proposed method, experimental results are demonstrated along with analytical and computational results. The final measured results using the proposed method show a broadband reflectivity response, with a fractional bandwidth of approximately 93% below -10 dB and a bandwidth increase of 17%.
KSP Keywords
Absorption bandwidth, Analytical Method, Circuit-based, Design procedure, Fractional Bandwidth(FBW), Logical design, computational results, efficient design, electromagnetic wave absorber, equivalent circuit model(ECM), periodic structure