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A Dual-Band Circularly Polarized Antenna with Slotted Reflector for GPS Applications

In this paper, a dual band circularly polarized (CP) antenna is proposed. The antenna consists of a radiator placed above a slotted reflector at a certain distance resulting in significant improvement of the front to back ratio (FBR). The antenna has a 10-dB impedance bandwidth of about 36 % (1.17-1.69 GHz), with a 3-dB axial ratio bandwidth (ARBW) of 8 % (1.21-1.31 GHz) in the lower band and 11.7 % (1.53-1.72 GHz) in the upper band, which makes the antenna suitable for global positioning system (GPS) applications. The FBR of the antenna is about 20 dB over the frequency bands of interest.