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Proposed graphene dipole antenna. (a) 3D view of the structure. Each half of the antenna consists of two graphene self-biasing patches separated by a thin Al2O3 layer. (b) Cross-section of the antenna. The lower graphene layer is in contact with the metallic electrodes of the source (here a THz photomixer). (c) Setup including the silicon lens for better directivity.
Real and imaginary parts of the antenna input impedance upon reconfiguration.
Qualitative transmission line model of the antenna.
Illustration of the resonant frequency dynamic tuning.
(a) Radiation efficiency at the resonance versus resonant frequency for different values of μc . (b) Total efficiency (including matching and radiation) of the antenna assuming a 10 kΩ photomixer.
Total efficiency obtained by simulating the actual two-layer graphene structure of Fig. 1, compared with a single layer of equal and double conductivity, respectively.
Directivity (H-plane) at the resonance with and without lens. (a) μc = 0 eV, f = 0.8 THz. (b) μc = 0.2 eV, f = 1.8 THz.
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