Novel dual-band antenna for multi-mode GNSS applications

Abstract

A novel dual-band antenna is proposed for mitigating the multi-path interference in the global navigation satellite system (GNSS) applications. The radiation patches consist of a shorted-annular-ring reduced-surface-wave (SAR-RSW) element and an inverted-shorted-annular-ring reduced-surface-wave (ISAR-RSW) element. One key feature of the design is the proximity-coupled probe feeds to increase impedance bandwidth. The other is the defected ground structure band rejection filters to suppress the interaction effect between the SAR-RSW and the ISAR-RSW elements. In addition, trans-directional couplers are used to obtain tight coupling. Measurement results indicate that the antenna has a larger than 10 dB return loss bandwidth and a less than 3 dB axial-ratio (AR) bandwidth in the range of (1.164–1.255) GHz and (1.552–1.610) GHz. The gain of the passive antenna in the whole operating band is more than 7 dBi.