A Compact Symmetrical BeiDou Antenna with Circular Polarization for Satellite Navigation and Positioning System

In order to miniaturize antenna size and realize circular polarization characteristic, according to the relationship between frequency and length of the patch, this letter validates a compact circular polarized microstrip antenna by introducing a high dielectric constant substrate (ε
r
=16), truncated opposite corners and an X-shape slot on the patch. Through experimental tests, comparison to similar works, it has proved that simulated and measured results of the fabricated antenna are in good agreement. The measured results of the proposed antenna at BD3 band, in terms of impedance matching, circular polarization characteristic, directivity and gain, are well accord with actual requirement for BDS. Therefore, the proposed antenna is a highly qualified candidate for BeiDou satellite navigation and positioning system applications.