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This work presents a performance analysis of probe-fed circularly-polarized moderately-thick microstrip patch antennas. Five typical geometries are designed according to the null reactance condition. A nonlinear regression, based on HFSS simulations, is implemented in order to identify the most robust geometry, regardÂ­ing the manufacturing process. The analysis focus is on broadside axial ratio degradation and frequency deviation parameters. ExperiÂ­mental results validate the proposed approach and the nonlinear regression calculations.

Performance Analysis of Probe-Fed Circularly-Polarized Moderately-Thick Microstrip Antennas Designed under the Null Reactance Condition