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Dual-Frequency Circularly-Polarized Patch Antenna With Compact Size and Small Frequency Ratio

by: XL Bao, MJ Ammann
Antennas and Propagation, IEEE Transactions on, Vol. 55, No. 7. (2007), pp. 2104-2107.

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A novel probe-fed single-layer annular-ring patch antenna for dual-frequency circular polarization is evaluated numerically and experimentally verified. The proposed antenna consists of a small circular patch surrounded by two concentric annular-rings, which is loaded by an unequal lateral cross-slot ground plane. The circularly-polarized frequency ratio of the two resonant modes is tunable to a small value, suitable for wireless communications systems. The patch size of the proposed antenna is reduced by about 53% compared to the conventional circular patch at a given frequency. The radiation characteristics of the novel antenna are also presented.


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