Dual-Band Stacked Patch Antenna with Cross-Slot Circular Polarization for GPS Application

A design of a dual-band circularly polarized GPS (L1 and L2) receiver has been proposed. This antenna design utilizes the concept of a stacked antenna that feeds through a single coaxial cable. Two radiators are placed on top of the stacked substrate to obtain the dual-band frequency. The probe feed and the chamfered corners on the radiators generate circular polarization. A cross slot applies to the top layer patch to miniaturize antenna dimension and improve the axial ratio. The L1 and L2 bandwidths of the proposed antenna are 71 MHz and 74 MHz, respectively. Both resonant bands' axial ratio bandwidth (3dB) is 18 MHz.