Axial-ratio Tuning in Nano-Dielectric Resonator Antenna for Optical Band Applications

摘要

A rectangular circularly polarized nano-dielectric resonator antenna (NDRA) is presented in the proposed work. The Gaussian pulse excitation is given through the nanostrip feedline. The excitation position is chosen at the edge of the feedline having width equivalent to the quarter wavelength. This will split the field components into the quadrature phase difference travelling at the edges of the feedline. The travelling field with orthogonal components coupled inside DR resulting in the circular polarization. Further, this technique is utilized to tune the axial-ratio of the antenna within different optical bands by changing the excitation position. The rectangular DR allows the generation of specific mode similar to the analogy of $TM_{0.1delta}$ mode in the cylindrical DR. The proposed NDRA is designed for the optical L, C, and S-band applications.