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Schematic of an all-dielectric Yagi-Uda nanoantenna composed of high-permittivity dielectric spheres. The antenna consists of a reflector (sphere 1) and three directors (spheres 2 to 4). A dipole source is placed equally from the reflector (sphere 1) and first director (sphere 2).
Radiation pattern of the antenna in (a) E-plane and (b) H-plane at the frequency 10.7 GHz. Solid lines show the results of numerical simulations in CST; the crosses correspond to the experimental data.
Directivity of the all-dielectric Yagi-Uda antenna in E and H planes obtained from the CST numerical simulations.
Photographs of the all-dielectric Yagi-Uda microwave antenna. (a) Detailed view of the antenna placed in a holder. (b) Antenna placed in an anechoic chamber; the coordinate z is directed along the vibrator axis; the coordinate y is directed along the antenna axis.
Experimentally measured antenna’s directivity in both E- and H-planes [cf. Fig. 3]. The curves connect the experimental points as a guide to the eye.
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