Abstract
The electromagnetic properties of active cylindrical coated nano‐particle antennas are investigated. It is demonstrated that the active cylindrical coated nano‐particle, whether illuminated by a plane wave or an electric Hertzian dipole (EHD) (small current) element, acts as a strong dipole radiator at its resonant frequency. It is shown that the plane wave scattering cross section could be increased by about 40 dBsm, and the maximum peak of the power radiated by an EHD element could be increased more than 65 dB in the presence of the active nano‐particle over its value when radiating into free space. An array, constructed with four active cylindrical coated nano‐particles and excited by an EHD element located at or near its center is also studied. Large directivity values, more than 8 dB, are obtained for particular array configurations and EHD locations.
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