Novel Receive Diversity Scheme Using ESPAR Antenna and Arbitrary Frequency Band

This paper proposes a novel receive diversity scheme which uses Electronically Steerable Passive Array Radiator (ESPAR) antenna in which reactance connected to parasitic antenna element is oscillated by sinusoidal waveforms of arbitrary frequencies. By controlling the frequency applying to the reactance, we can use frequency bands both assigned and not assigned to the corresponding communication systems without causing any interference to the signals used in the band. We propose several receiver structures for Orthogonal Frequency Division Multiplexing (OFDM) systems and evaluate Bit Error Rate (BER) to confirm the effect of the proposed diversity scheme with Maximum Ratio Combining (MRC) and Selection Combining (SC).