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

Abstract

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.

Planar MIMO antenna for mmWave applications: Evolution, present status & future scope

“…Hence this can be obtained through Multiple-Input-Multiple-Output (MIMO) antennas at the mmWave band [ 40 ]. The discussion of array antennas is out of scope in this article as these antennas are categories based on feeding techniques [ [41] , [42] , [43] , [44] ] and reconfigurability [ [45] , [46] , [47] ]. Hence, the focus of this review article is restricted to planar MIMO antennas because these antennas perform better in terms of gain, bandwidth, directivity, and data rate.…”