Compact dual-band circularly polarised GNSS antenna

As is well known, the global navigation satellite system (GNSS) antenna always suffers from the size problem. The authors' propose that two shorting probes in parallel are loaded on a patch antenna and a dual-band compact GNSS antenna, which has a smaller electrical size of only 60 mm (0.23λ) × 60 mm ×18 mm (0.07λ) × (λ being the wavelength in free space). A dual-layer feed network is also designed to achieve circular polarised radiation. Simulated and measured results show that the proposed antenna has good and stable performance over both dual operating bands.