A new element antenna array topology of U-slot aperture coupled microstrip patches is introduced. The array is fed by a novel wideband self-adapting matching network and the energy is coupled to the U-slot patches through the feed slot on the ground. The oper- ating frequency range of antenna array is from 10.4 to 16.7GHz, corresponding to an impedance bandwidth of 46.5%. The gain is above 13dBi from 11{15GHz.
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Chai et al. (2007) studied this question.
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