Design of a Tri-Band Circularly Polarized Antenna for BeiDou and S-Band Satellite Communication

This paper presents a tri-band circularly polarized (CP) antenna for BeiDou Navigation Satellite System (BDS) and S-band satellite communication. The proposed antenna operates at
$2185\ \text{MHz}\pm 15\ \text{MHz}$
with RHCP,
$1995\ \text{MHz}\pm 15\ \text{MHz}$
with LHCP, and
$1268\ \text{MHz}\pm 10\ \text{MHz}$
with RHCP. All of these three antennas are dual-fed for lower axial ratio. In order to obtain better isolation, independent feeding networks are designed for each band. High dielectric constant dielectric substrate is adopted for miniaturization. The overall size of the proposed antenna is
$48\text{mm}\times 48\text{mm}\times 9.6\text{mm}\ (0.2 \lambda\times 0.2 \lambda\times 0.04\lambda)$
. Details of design, simulated results of this CP are presented and discussed. The simulated and measured results meet the requirement of BDS and satellite communication applications.