Circularly Polarized Double Layered Printed Hemispherical Helical Antenna with a Parasitic Wire for Bandwidth Enhancement

摘要

A helical antenna that is printed on a layered dielectric hemisphere has been studied when a parasitic helical wire is incorporated in the structure. Experimental and theoretical results demonstrate that the 3 dB axial ratio (AR) bandwidth can be enhanced by approximately 100% for optimized length and position of the parasitic wire. The analysis has been implemented using the method of moments (MoM), and good agreement has been achieved between computations and measurements.