A broadband ultrathin metamaterial absorber using tilted parallel strips

Farzad Ahmadi; Nathan Ida

doi:10.1117/12.2254479

24 February 2017 A broadband ultrathin metamaterial absorber using tilted parallel strips

Farzad Ahmadi, Nathan Ida

Proceedings Volume 10103, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X; 101031V (2017) https://doi.org/10.1117/12.2254479
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

A polarization insensitive metamaterial absorber is proposed consisting of a dielectric layer sandwiched between two tilted parallel metallic strips and a ground plane. First, a new analytical model is introduced to predict the resonance frequency for square, rectangular and wire geometries which shows less relative errors in comparison with previously proposed models. Then, ultra wide bandwidth absorption covering the entire x-band and Ku-band restricting a 10-dB absorption bandwidth is achieved with a relative material thickness λ₀/10 and a relative FWHM absorption bandwidth of 90% for normal incidence angle. The model also shows good absorption coefficients for oblique incident angles for both s- and p-polarizations. Three different resonance modes are observed, which led to such broadband absorption. Each resonance mode is investigated to determine its dependence on the scatterers and unit cell dimensions, which can help one to design a multiple band absorber. The electromagnetic field distributions of the scatterers are studied to explain the absorber mechanism. The results are compared to previous works showing remarkable improvement.

Conference Presentation

Citation Download Citation

Farzad Ahmadi and Nathan Ida "A broadband ultrathin metamaterial absorber using tilted parallel strips", Proc. SPIE 10103, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X, 101031V (24 February 2017); https://doi.org/10.1117/12.2254479

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