Dual-band dual-pattern truncated-corners microstrip antenna for GPS and WiFi applications

This paper proposes a dual-frequency antenna for vehicles. The antenna structure consists of single patch and single feed. It is operated at the center frequency of GPS system at 1.575 GHz with circular polarization and 2.45 GHz for Wireless Local Area Networks (WLAN) with linear polarization. At 1.575 GHz, |S₁₁| ≤ -10 dB can cover the frequency from 1.51 to 1.61 GHz. At 2.45 GHz, |S₁₁| ≤ -10 dB can cover from 2.45 to 2.48 GHz, respectively. The axial ratio bandwidth (AR <; 3 dB) is ranged from 1.56 to 1.59 GHz. The measured gains are 4.74 dBic and 2.08 dBi at center frequency, respectively. The half-power beamwidths (HPBW) in xz- and yz-planes are 85 and 85 degrees and the AR beamwidths in xz- and yz-planes are 180 and 200 degrees, respectively.