Technical Developments for Sidelobes Suppression of Millimeter Wave Array Antennas

In terms of 5G mobile broadband technology, the application of millimeter wave is one of the key components, and phased array antenna has been an important way to realize high gain. Therefore, the suppression of the side-lobes of array antenna with millimeter wave frequency has become a major issue in antenna design. This paper focuses on the design of array antennas, dividing into two parts. (1) Analysis of array antenna design which reduces sidelobes: We first propose a design having a resistive plate placed at the array antenna aperture, so that the main beam can radiate smoothly without affecting the beam scanning. In terms of reducing side lobes, the electromagnetic wave can be attenuated by the resistive plate we design. We also design a set of resistive horn edge and rolled edge to be placed along the edges of array antenna to reduce the edge diffraction effect. (2) The development of using numerical genetic algorithm (GA) on the suppression of side-lobes of array antenna: This paper develops a radiation optimization algorithm for the resistive plate placed on the array antenna implemented in a practical numerical electromagnetic method as a design tool for developing 5G radio frequency array antennas.