Premium
Investigation of an artificially synthesized electromagnetic absorber
Author(s) -
Lee Yoonjae,
Mittra Raj
Publication year - 2000
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/1098-2760(20001220)27:6<384::aid-mop4>3.0.co;2-#
Subject(s) - materials science , engineering
A new approach for synthesizing an artificial electromagnetic absorber, as inclusions in a host medium, is proposed in this paper. To realize an absorber, which also has a low reflection, a combination of two sets of thin wire geometries is employed. These include hairpin‐shaped inclusions, whose reflection coefficients exhibit phase shifts close to zero, and dipoles whose corresponding phase shift in the backscattered field is approximately 180°. We show that a synthesized medium with these inclusions has the desirable properties of a low‐reflection medium. To render the medium absorptive, as well as to suppress the resonances of the inclusions, we introduce finite conductivities in the wire structures. The synthesized medium is optimized for minimum reflection by using the genetic algorithm (GA) to achieve further improvement in its bandwidth as a low‐reflection absorber. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 27: 384–386, 2000.