Design of a Single-Layer ±45° Dual-Polarized Directional Array Antenna for Millimeter Wave Applications

• Published in: Sensors (Basel, Switzerland) Vol. 21; no. 13; p. 4326
• Main Authors: Lv, Qinyi, Yang, Yu-Hang, Zhou, Shi-Gang, Shao, Chan, Zhou, Deyun, Sim, Chow-Yen-Desmond
• Format: Journal Article
• Language: English
• Published: MDPI 24.06.2021; MDPI AG
• Subjects: dual circularly polarized (CP); dual linearly polarized; millimeter wave (mm-wave); single layer
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s21134326

A single-layer ±45° dual-polarized directional array antenna for millimeter wave (mm-wave) applications is designed in this communication. Based on the theory of orthogonal circularly polarized (CP) wave multiplexing, two ports of a series-fed dual CP array are fed with equal amplitudes, and the array can radiate a linearly polarized wave with ±45° polarization orientations through the adjustment of the feeding phase difference. As the two ports of the series-fed array are simultaneously excited, the antenna can achieve directional radiation. In addition, the cross-polarization level of the array can be effectively suppressed by placing two series-fed arrays side by side. A prototype of the designed array antenna operating at 30 GHz is fabricated and measured; the working bandwidth of the proposed antenna is approximately 3.5%. Owing to its simple structure and directional radiation, the proposed antenna array is a competitive candidate for mm-wave applications.