期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 69, 期 5, 页码 2759-2767出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3032834
关键词
Resonant frequency; Surface waves; Surface impedance; Varactors; Bandwidth; Impedance; Electromagnetic devices; electromagnetic metamaterials; electromagnetic wave absorption; nonlinear circuits
资金
- Office of Naval Research [N00014-15-1-2062]
The article introduces a novel metamaterial surface that actively tunes its resonance frequency to absorb electromagnetic waves, achieving a self-tuning function. Experimental results confirm the performance of the metamaterial surface and the increase in absorption frequency range, demonstrating high practical value.
We demonstrate a unique metamaterial surface that actively tunes its resonance frequency to match the frequency of incident electromagnetic waves, providing a broadband self-tuning absorber. The metasurface is constructed with nonlinear circuit components and is capable of detecting the incoming signals and adapting its resonant frequency without any external control. The fabricated prototype achieves 70% of -3 dB fractional frequency range compared with the intrinsic limit of around 5% for a passive absorbing surface of the same thickness. Its performance is experimentally verified by measuring absorption as a function of frequency with the self-tuning circuits turned on or off to demonstrate the self-tuning capability and the increase in the absorption frequency range. The measurements were performed for both TM and TE polarizations and various oblique incident angles. The proposed metasurface has a threshold power level for the absorption of incident waves and only absorbs high-power interfering signals while allowing small signals, such as for communications.
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