Design of a Wideband Spaceborne Stacked GNSS Antenna Featuring Chamfered-Serrated Conductive Walls and a Cross-Shaped Shorting Stub

This paper proposes an improved three-layer patch stacked antenna design to address the efficiency and gain sag issues of traditional stacked GNSS antennas in a wide frequency band. The design utilizes conductive walls with chamfered and serrated structures and cross shaped short-circuit branches, effectively suppressing the in band sag phenomenon. The simulation results show that the antenna operates within the full GNSS frequency range of 1.16-1.61GHz, S11<-13dB， The in band gain is flat, with peak gain>5.5dBiC and axial ratio<1dB. This design significantly improves broadband performance and adaptability to onboard environments, providing a practical solution for onboard navigation receivers.