Miniaturized Tri-band Circularly Polarized Staired Rectangular Dielectric Resonator Antenna for Navigation Satellite Applications.

In this paper, miniaturized tri-band Circularly Polarized (CP) staired Rectangular Dielectric Resonator Antenna (RDRA) using novel design feed network of trisection Wilkinson Power Divider (WPD) with wideband 900 phase shifter is developed for navigation satellite applications at L5-band (1.164 to 1.188 GHz), L1- band (1.565 to 1.585 GHz) and S-band (2.48 to 2.5 GHz). For tri-band RDRA, the ground plane size is reduced to 40 mm x 40 mm at lower resonance frequency of 1.176 GHz using high dielectric constant (er = 51.92) of dielectric resonator material and dielectric substrate (es = 10.2) (Rogers RO3210). Ground plane area and volume of RDRA are achieved small compared to published research works. Circular polarization of tri-band RDRA produces in L5-, L1- and Sband using novel design feed network trisection WPD with wideband 900 phase shifter. Far field radiation patterns of tri-band RDRA are obtained from electric field distribution of TEy111, TEy113 and TEy112 modes at center frequencies of 1.176 GHz, 1.575 GHz and 2.49 GHz, respectively. Simulated Return Loss (RL) of triband RDRA is achieved to be more than 10 dB over L5-, L1- and S-bands. The simulated peak Right Hand Circular Polarization (RHCP) gain is varying between 0.92 to 2.3 dB over all bands. Simulated Axial Ratio (AR) is obtained to be lower than 3 dB overall band. Tri-band RDRA is analyzed, fabricated and tested. Various parameters such as RL, RHCP-LHCP (Left Hand Circular Polarization) far field radiation patterns, RHCP gain and AR of tri-band DRA are obtained simultaneously over L5, L1 and Sbands as per design technical specifications that's novel contribution. [ABSTRACT FROM AUTHOR]