期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 18, 期 5, 页码 916-920出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2019.2905860
关键词
Absorber; frequency-selective surface (FSS)
资金
- Commonwealth of Australia Defence Science and Technology Group
The bandwidth-thickness tradeoff is fundamental to the design of thin absorbers based on frequency-selective surfaces (FSSs). In this letter, we challenge the common belief that adding a dielectric superstrate will enlarge the bandwidth at the cost of increased thickness. It is first demonstrated using lumped circuit considerations so that a wider relative operating bandwidth can be achieved with a thinner absorber including an impedance-matching cover. By adopting this dielectric superstrate, we further show on the basis of full-wave simulation that the highest bandwidth ratio (BWR) at 10 dB absorption can be increased from 1:3.54 to 1:6.94, with the normalized thickness being reduced from 0.0920 to 0.0906.L (including superstrate). Restricted by readily available materials, an experimentally validated design obtains a BWR of approximately 1:5.32 at 10 dB absorption for a figure of merit of 88.26%. This performance is superior to existing designs with more complicated FSS patterns.
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