A Light-weight Low-profile GNSS Antenna Based on Wideband Multipath Mitigation Strategy

A new light-weight low-profile antenna based on wideband multipath mitigation strategy for high precision global navigation satellite system (GNSS) is presented. The multipath mitigation strategy is realized by using two shorted rings and several discretely distributed absorbing materials. The two shorted metal rings can improve the spatial axial ratio and broaden the pattern beamwidth, and the absorbing materials significantly enhance the multipath mitigation performance. One prototype of the proposed light-weight GNSS antenna is designed and fabricated for demonstration. The measured results show that the front-to-back ratio (FBR) is over 30 dB across the entire GNSS bands (1.16-1.28GHz and 1.53-1.62GHz). The 3dB spatial axial ratio and 3dB beamwidth is about ±82° and 80°. The proposed antenna performs similarly to its counterpart but with a lighter weight of about 1.2kg and a lower profile size of 70mm.