volume | PIER Journals

Abstract

A new circularly polarized (CP) array using the filtering phase shifting theory is designed. First, it is displayed that a phase designable filter can be obtained by controlling the position of the transmission zero (TZ) of the doublet topology. Next, by mapping the topology into a stub-loaded resonator (SLR) and using the patch as the last resonating mode, a phase designable 3rd-order filtering antenna element is designed. Then, two filtering antenna elements with 90° phase difference are obtained. Finally, by using the slot-coupled feed structure, four elements with phases of 0°, 90°, 180°, 270° are rotated sequentially to form a circularly polarized array. The measured results show that the impedance bandwidth is 8.1% (5.07-5.5 GHz); the axial ratio (AR) bandwidth is 6.7% (5.05-5.4 GHz); the maximum CP realized gain is 10.5 dBic; and the good filtering function is implanted.

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Professor Xin Guo

Dr. Meiyu Du

Dr. Wen Wu

Dr. Zhihong Feng

Dr. Zhiping Wan