Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 62, Issue 5, Pages 2652-2658Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2014.2308511
Keywords
Absorber; artificial impedance surface (AIS); broadband absorber; electric LC resonator (ELC); metamaterial; polarization independent
Funding
- Low Observable Technology Research Center program of Defense Acquisition Program Administration and Agency for Defense Development
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A polarization-independent ultrawideband metamaterial absorber is proposed for X-band applications. High absorptivity over an ultrawide spectrum is achieved by the combination of an artificial impedance surface (AIS) and a resistor-capacitor (RC) layer. In addition, the unique hexagonal shape of an AIS and RC layer enables polarization insensitivity. A circuit analysis is introduced based on a transmission-line model and shows good agreement with the full-wave analysis. Fabrication tolerance issues are considered with parametric studies in the electromagnetic simulation. The proposed absorber is fabricated on low-cost FR4 substrates, and its absorption performance is experimentally demonstrated at different angles and polarizations of incident electric fields.
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