ABSTRACT
Orientation of electric fields with respect to propagation of e.m. waves is called polarization. This can be linear (vertical or horizontal), elliptical and circular polarization. A circular polarized signal is called a robust signal in propagation, as it can avoid multi-path fading. Generation of circular polarization signals need interaction of two e.m. waves at 90°. This phenomenon is also called generation of orthogonal fields. This chapter describes a single micro-strip fed circularly polarized dielectric resonator antenna as one of the best techniques to generate circular polarization. The axial ratio bandwidth and impedance bandwidths are two very important parameters in DRA. Basic requirements are to achieve large axial ratio bandwidth and impedance bandwidths in DRA.
This has been presented with the help of experimentation and simulations in a DRA. LHCP (left hand circular polarization) and RHCP (right hand circular polarization) results have been obtained on prototype DRAs. This can be used for vehicular communication applications. In this model, three different frequencies—4.23, 7.23, and 8.21 GHz—have been worked out for circular polarization. Multipath spreading is controlled by circular polarization.
