부산대학교 도서관

A new circularly polarized (CP) array using the filtering phase shifting theory is designed. First, a phase-designable filter is designed by adjusting the position of the transmission zero (TZ) of the doublet topology filter. Next, a phase-designable 3rd-order filtering antenna element can be obtained by using a stub-loaded resonator (SLR) as the physical structure of the doublet topology, and the patch is treated as the last resonating mode. Then, two 3rd-order filtering antenna elements with 90[degrees] phase difference are designed. Finally, by using the slot-coupled feed structure, four elements with phases of 0[degrees], 90[degrees], 180[degrees], 270[degrees] 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.
1. INTRODUCTION In modern communication systems, microstrip circularly polarized (CP) antenna has been extensively spread thanks to its merits of combating multi-path fading, insensitivity to linear polarization direction, and low [...]