Miniaturized L1 and L5-Band Circularly Polarized Rectangular Dielectric Resonator Antennas for Navigation Satellite Applications

Miniaturized L1 (1.565-1.585 GHz) and L5 (1.164-1.188 GHz)-band Circular Polarized (CP) Rectangular Dielectric Resonator Antennas (RDRAs) are designed, analyzed, fabricated and tested for navigation satellite applications. Ground plane area of RDRAs are reduced using high dielectric constant (ε
r
= 51.92) dielectric resonator material and dielectric substrate (ε
r
= 10.2). Miniaturized RDRAs are designed at center frequencies 1.575 GHz with ground plane footprint area of 28 mm × 28 mm for L1-band and 1.176GHz with ground plane footprint area of 40 mm × 40 mm for L5-band, respectively. Circular polarization of RDRAs for L1 and L5-band are generated using Wilkinson Power Divider (WPD) with wide-band 90° phase shifter. Broadside radiation patterns of RDRAs for L1 and L5-band are obtained using TE
^y
111
mode. Simulated and measured Return Loss (RL) of RDRAs for L1 and L5-band are better than 14 dB. Simulated Right Hand Circular Polarization (RHCP) gain of RDRAs are 2.05 dB for L1 and 1.6 dB for L5-bands, respectively. Simulated Axial Ratio (AR) of RDRAs for L1 and L5-band are found to be lower than 3dB. Measured parameters such as RHCP-LHCP (Left Hand Circular Polarization) radiation patterns, RHCP gain and AR are found to be closed agreement with simulated results.