Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 69, Issue 3, Pages 1793-1798Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3011115
Keywords
Graphene; Frequency selective surfaces; Varactors; Reflection; Resistance; Capacitance; Frequency-selective surface (FSS); graphene; tunable absorber; varactor
Funding
- National Natural Science Funds of China [61975209, 61605213]
- Sichuan Science and Technology Program [2020JDJQ0006]
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The paper presents a tunable radar absorber based on graphene and varactor, which can independently control the absorption amplitude and frequency, and has polarization-insensitive characteristics.
In this communication, we propose a tunable radar absorber based on the combination of a graphene capacitor with a varactor-loaded active frequency-selective surface (FSS). The absorbing amplitude and frequency can be independently controlled by changing the effective sheet resistance of graphene and the capacitance of the varactor through different bias voltages, respectively. We fabricated the designed absorber and measured its tunable reflectivity. The measured results indicate that the absorber can tune its absorbing frequency ranging from 3.53 to 7.05 GHz under normal incidence when changing bias voltages applied to the varactors from 0.5 to 10 V. By further varying the graphene resistance through the bias voltage, the absorbing amplitude at each absorbing frequency can be dynamically modulated. In addition, it is found that the absorber achieves polarization-insensitive characteristics due to the symmetrical design of the active FSS. The physical mechanism of this absorber is discussed by providing the equivalent transmission-line (TL) model.
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