Abstract
A low-profile tri-band stacked patch antenna with omni-directional liner polarization (LP) and directional circular polarization (CP) characteristics is proposed in this paper. Two layers of patches are used to generate triple resonances. The top patch is fed by a single coaxial probe and the bottom patch is excited through electromagnetic coupling. Symmetrical corner truncations are used to achieve CP. Conductive vias are employed to realize omni-directional LP at the desirable operating band. A prototype antenna is designed and fabricated, which operates at the frequency bands centered at 1.615 and f <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> GHz, respectively, for supporting two satellite communication services at one time and providing dual-band CP characteristics. Furthermore, omni-directional vertical LP characteristic in S-band is also realized for data link between unmanned aerial vehicles (UAVs). The occupied volume of the proposed antenna is 70mm×70mm× 5.4mm. When working at the CP modes, its VSWR is less than 2 and the axial ratio (AR) is less than 3 dB. While operating at the LP mode, its VSWR is less than 2.5 and the variation for omni-directional radiation pattern in the horizontal plane is less than 2 dB. The proposed antenna is useful in highly integrated airborne platforms.
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