This paper presents a novel dual-band circularly polarized patch antenna for precise satellite navigation. The radiation elements are\ncomposed of the inner cross-shaped patch and the outer annular patch which are printed on the same surface of one substrate. Two\npatches work in different bands, respectively, and emit dual-band circularly polarized radiation. In order to obtain a more compact\nantenna to meet the application of precise satellite navigation, we vertically place four metal cylinders under the ends of the cross-shaped\npatch to form four capacitive loadings to lower the resonant frequency of the inner cross-shaped patch. A capacitive coupling feed\nstructure is used to match the input impedance of a patch antenna and make the antenna compact enough. The simulated and measured\nresults show that the proposed antenna can produce appropriate dual-band circularly polarized radiation patterns for precise satellite\nnavigation. The measured results of the antenna illustrate that maximum RHCP gain of the antenna is 4.72 dBi in the low band and\n3.98 dBi in the high band, the 3 dB gain bandwidth is 70MHz in the low band and 65MHz in the high band.
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