Abstract
This paper presents the design of millimeter wave (mm-Wave) antenna arrays with beam-scanning capabilities and potential use for fifth generation (5G) applications. We begin with a fixed-beam low-profile antenna array, which has a wide bandwidth and high gain in the millimeter-wave (mm-wave) band, and then go on to add the beam-scanning feature to the array. The proposed antenna covers most of the Ka-band, has a bandwidth of 10 GHz and exhibits a maximum gain of approximately 25 dB for the array dimension investigated, which exhibits good aperture efficiency. Next, the array is modified by using a beam scanning technique, which enables it to carry out a 2D beam scan at a fixed frequency, without using conventional phase shifters that are lossy as well as costly at mm waves. The issue of circular polarization (CP) is also investigated and CP is achieved by adding transverse radiating elements to the aperture array. Illustrative designs of the proposed antennas are included in the paper.