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A wideband 2times2 planar microstrip antenna array with dual circular polarization is proposed for serving mobile satellite communications. The basic array element is an optimized diagonal slotted diamond shaped dumbbell aperture fed patch antenna for improved axial ratio and impedance bandwidth performance. A 2:1 impedance bandwidth of 23% and 3 dB axial ratio bandwidth of 19.2% with a circular directivity...
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