A 2× 2 quasi-Yagi antenna array fed by a novel orthogonal T junction is presented. The orthogonal T junction is constructed with a traditional microstrip T junction, two planar microstrip to CPW transitions and two orthogonal microstrip to CPW transitions. The orthogonal T junction can be integrated with the quasi-Yagi array element directly. A 2× 2 prototype operated from 7.6 GHz to 12 GHz is fabricated and measured.
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Zhang et al. (2008) studied this question.
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