An All-Metal High-Efficiency Wide-Angle Scanning Phased Array Based on Dual-Port PMA

Le résumé fourni par la source

In this paper, an all-metal high-efficiency dual-port phase mode antenna (PMA) is proposed. By adjusting the phase difference between the two ports in the PMA, distinct characteristic modes are excited, enabling a continuous transition of the radiation pattern from a conical beam to an axial beam. Consequently, the PMA achieves element-level two-dimensional beam steering, with the main beam capable of scanning within ±45° in thexozplane and ±48° in theyozplane. Furthermore, high port isolation exceeding 30 dB in the dual-port PMA is achieved by introducing a novel decoupling technology, named the evanescent-wave-based decoupling method. Due to its all-metal structure and high port isolation, the PMA maintains a total efficiency exceeding 98% under all excitation conditions. To validate its potential for high-efficiency wide-angle scanning, a 4 × 4 planar phased array based on the PMA is designed and fabricated. By employing enlarged element spacing and introducing the defected ground structure, mutual coupling between array elements is significantly reduced, resulting in improved array efficiency. Experimental results demonstrate that the 4 × 4 array achieves wide-angle beam steering of ±66° in thexozplane and ±90° in theyozplane, with a total efficiency ranging from 79% to 94.5%.

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