In this paper a new application of a Rectangular Dielectric Resonator Antenna (RDRA) is presented. The experimental and simulation results of an RDRA show that the difference between the co- and cross-polarisation radiation levels is at least 15dB. Using a single RDRA exciting by two probes at two modes TEx111 and TEy111, an antenna to receive two orthogonal polarisation waves is made. A communication system including a transmitter with two orthogonal dipoles and correspondence switching polarisation diversity receiver at 2.36GHz was designed and implemented to demonstrate the application of polarisation diversity of an RDRA as the receiver antenna.

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