Nonmagnetic ultra wideband absorber with optimal thickness
Author
Summary, in English
Design of ultra wideband absorbers with bandwidth ratios larger than 10:1 is investigated. It is explained that if there is no constraint on the total thickness of the absorber, achieving large bandwidths is straightforward. The problem becomes challenging when the minimization of the total thickness is considered. It is shown that for a given frequency response, the total thickness of a nonmagnetic absorber cannot be less than a theoretical limit. If a design method can reduce the total thickness to the theoretical limit level, its superiority over other design methods is doubtless. It is demonstrated that the capacitive circuit absorber approach has this unique feature. In order to clarify the design ideas and techniques, the optimal absorber is developed in different stages. It is shown that unequal periods for the low-pass frequency selective surfaces are essential for attaining the optimal performance.
Publishing year
2010
Language
English
Publication/Series
Technical Report LUTEDX/(TEAT-7189)/1-14/(2010)
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Document type
Report
Publisher
Electromagnetic Theory Department of Electrical and Information Technology Lund University Sweden
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Status
Published
Report number
TEAT-7189
Research group
- Electromagnetic theory