Abstract
A small annular slotted BeiDou antenna with symmetric slits is proposed for applications in Compass Navigation Satellite System of China. Two symmetric annular slots with tabs are embedded onto a circular microstrip patch for circularly polarized (CP) radiation. Good CP radiation and impedance matching can be achieved by reasonably adjusting the radii of the annular slots and the position of the tabs. Six pairs of symmetric slits are embedded along the radial direction of the circular patch to reduce antenna size. We achieve a total patch area reduction of 23.3% compared with the traditional tuning stub CP antenna. Owing to the symmetric structure, the deviation of the phase center is only about 1.76 mm at the central frequency. The measured results agree well with the simulated results.
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