Abstract
A compact dual-band and dual-circular polarization (CP) stacked patch antenna is investigated for BeiDou navigation satellite system. The proposed antenna employs a single coaxial probe to feed two layers of patches simultaneously, realizing dual-band operation. The bottom patch with symmetrical slant corner-cuts and the top one with two rectangular stubs on the diagonal produce a pair of degenerated modes, achieving CP radiation. Furthermore, two L-shaped stubs are loaded on the top patch to widen impedance bandwidth. A prototype operating at the bands of 1.615/2.492 GHz was fabricated and measured. Both the left- and right-handed CP radiations are obtained concurrently in the dual bands. The proposed antenna has a profile of 4.6 mm $({{{\bf 0}}.{{\bf 024}}{{{\bf \lambda }}_0}})$ and occupies an area of $\text{70}\;{\text{mm}} \times \text{70}\;{\text{mm}}\;({0.38{\lambda _0} \times 0.38{\lambda _0}})$ . The measured impedance bandwidth with | S 11| < –10 dB is 9.1% and 5.1% for the lower and upper bands, respectively. The measured 3 dB axial-ratio bandwidth is more than 1% for both bands.
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