A Wideband and Dual-Polarized Millimeter-Wave Antenna With Single-Layered Geometry and Low Profile

Abstract

This paper reports the design of a novel wideband and dual-polarized millimeter-wave antenna with single-layered geometry and low profile. The antenna is mainly composed of a square patch and two inverted-F antennas (IFAs), and they are located in the same substrate layer. Wide bandwidth has been achieved by taking advantage of the dual resonances generated by patch and IFA modes. The antenna feed is constructed by a through pin connecting to the corresponding IFA and, therefore, leading to a dual-polarized antenna performance as well as a single-layered antenna structure with a low profile of 0.07 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> . An L-shaped metal strip has been introduced in order to improve the port isolation. The design concept has been verified by prototyping and testing a 2×2 array antenna in the Ka band. It has been demonstrated that the proposed 2×2 array antenna has a 21% bandwidth with average total efficiency higher than 72% and realized gain up to 11.1 dBi.