A singly-fed wideband circularly polarized dielectric resonator antenna (CPDRA) is proposed in this paper. Antenna structure contains a rectangular and two half split cylindrical dielectric resonators (DRs). Multiple orthogonal modes are excited in the antenna structure when excitation is applied through a stair-shaped slot. Measured results show that antenna provides wider 3-dB axial ratio (AR) and impedance bandwidths of 41.01% and 49.67%, respectively. Proposed antenna can be utilized in C-band applications.

A technique is implemented for obtaining the circular polarization in a nano-dielectric resonator (DR) antenna. A cylindrical DR has been excited by a nanostrip feedline. The application of input Gaussian pulse at the corner of feedline splits the field components into two parts. These field components travel at the edges of the feedline with a quarter wavelength path difference between them. The coupling of these field components to DR provides the circularly polarized response. The antenna is designed for operating in the optical C-band. The proposed antenna provides the 10 dB impedance bandwidth of 11.58% (187–210 THz) and 3 dB axial ratio bandwidth of 5.72% (188.5–199.6 THz).