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Optimum Design of N Sheet Capacitive Jaumann Absorber Using Genetic Algorithm
Ahmad CHELDAVI
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E82A
No.4
pp.704706 Publication Date: 1999/04/25
Online ISSN:
DOI:
Print ISSN: 09168508 Type of Manuscript: LETTER Category: Numerical Analysis and Optimization Keyword: capacitive Jaumann absorbers, genetic algorithm, optimization,
Full Text: PDF>>
Summary:
An optimun design for N(arbitrary)sheet capacitive Jaumann elctromagnetic (EM) wave absorber, using genetic algorithm will be presented. This algorithm is a random optimization method based on the genetic relation in the human being. We show the bandwidth for twosheet capacitive Jaumann absorber can be expanded even more than 108% showed by knott, by using this algorithm and without imposing the doublenotch design criteria. We also show that our results approaches knott's results when we restrict the characteristic impedances and lengths of the lines to vary within a very short range. We also design onesheet and threesheet capacitive Jaumann absorbers. The only restriction used here is about the meaningful range for the design variables. The goal of this algorithm is that we can impose arbitrary restriction about the range of the variation of the variables. So we can see the performance behaviour with the range dimension of the variables, and we can obtain different optimum results for different ranges. Finally we obtain a 20dB attenuation bandwidth more than 145% for onesheet, 173% for twosheet (compare with 108% obtained in [1]) and 193% for threesheet capacitive Jaumann EM absorbers, with some acceptable short range for the variables. We design the onesheet and twosheet capacitive Jaumann absorbers at low frequency and the threesheet at high frequency. The 20dB attenuation bandwidth obtained for the onesheet and twosheet capacitive Jaumann absorbers are respectively, from 10 to 77 MHz and, from 4 to 61 MHz. For the threesheet capacitive Jaumann absorber the 20dB attenuation bandwidth obtained is, from 0.8 GHz to 280 GHz.

