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A compact tri-band antenna for GPS and GSM applications

A compact tri-band antenna is presented in this paper for GSM 900/1800 and GPS applications. The proposed antenna is constructed by two stacked structures, one is a microstrip square ring patch with truncate corners for GPS L1 band, the other is two nested small loops with a multistage matching network composed of lumped components and shorting pins for GSM 900 and 1800 bands, respectively. The dimension of the antenna is 60 × 60 × 12 mm3. Simulation results indicate that the antenna radiates omnidirectional pattern with vertical polarization at GSM 900/1800 bands, and broadside pattern with right-hand circular polarization at GPS L1 band. Finally, a prototype of the antenna is fabricated and measured, whose measurement results meet well with the simulation results.