Design of single-layer single-feed patch antenna for GPS and WLAN applications

A design of single-layer single-feed dual-frequency patch antenna with different polarizations is presented for the first time. The structure of the proposed antenna is a single layer patch, which mutually nested inside and outside patches and connected together with four conducting strips. Two operating frequencies of the proposed antenna can be observed in the simulated and measured results. The inside patch operates at the high frequency and outside square patch operates at the low frequency. The center frequency of the antenna prototype for Global Positioning System (GPS) is 1.575 GHz with circular polarization and 2.4 GHz for Wireless Local Area Networks (WLAN) with linear polarization respectively. The impedance bandwidth and axial ratio of the proposed antenna is studied through electromagnetic simulations and measurements.