Abstract
An unconventional structured, dual-band, circularly polarized microstrip patch antenna is proposed for GPS aided GEO augmented navigation (GAGAN) receivers operating at L1 and L5 frequencies. The antenna has a square and an annular ring patch configured by five small microstrips with a cross slot etched in between the two substrates, to aid in gain enhancement. To obtain high impedance matching, shorting pins are added across the feed. By incorporating combinatorial configurations such as perturbations in the inner annular ring antenna circular polarization is produced, thus obviating the need for a complex feed network. The proposed antenna covers 20 MHz of 10 dB impedance bandwidth in both the bands having S <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> of -26.05 dB in L5 and -23.68 dB in L1. It radiates an omni-directional LHCP pattern in both bands with cross polarization above -25 dB. Gain of 4.65 dBi and 3.7 dBi and the axial ratio of 1.37 dB and 1.98 dB is obtained in L5 and L1 bands respectively.
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