期刊
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
卷 18, 期 12, 页码 2508-2512出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2019.2941661
关键词
Absorption; Switches; PIN photodiodes; Frequency selective surfaces; Integrated circuit modeling; Resistors; Passband; Equivalent circuit model; frequency-selective surface; metamaterial absorber; rasorber; switchable
资金
- National Nature Science Foundation of China [61571218, 61671231, 61801207, 61731010]
- National Key Research and Development Program of China [2017YFA0700201]
- China Postdoctoral Science Foundation [2017M620202]
- Natural Science Foundation of Jiangsu Province, China [BK20151393]
This letter presents a switchable dual-polarized frequency-selective rasorberabsorber at low microwave frequency based on double-layered metallic resonant structure array loaded with lumped elements. It consists of an absorbing layer and a bandpass frequency-selective surface layer loaded with PIN diodes, sandwiched with an air-spacer between them. The operating principle is analyzed with the help of an equivalent circuit model. By biasing the PIN diodes on or off, it can be easily switched between the rasorber and absorber modes. When in the rasorber mode, it exhibits a passband at 1.6GHz with 1.7dB insertion loss between two neighboring absorption bands. While switched to the absorber mode, it achieves more than 80 absorptivity ranging from 0.8 to 3.4GHz, corresponding to a fractional bandwidth of 124. The total thickness is less than 8 of the free-space wavelength at the lowest operating frequency. A prototype of the proposed structure is fabricated and measured, where reasonable agreements between simulations and measurements are observed.
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