Analysis and Design of Low-Profile Reconfigurable Leaky-Wave Antennas Based on Substrate Integrated Waveguide for 5G Millimeter-Wave Applications

Abstract

5G millimeter-wave (mm-wave) applications have several challenges, such as detection accuracy, interference from other channels, high path loss, covering several users in a dense area, and vulnerability to the environmental conditions. Several antenna technologies were proposed in this dissertation to address some of the above-mentioned challenges in 5G applications with a focus on wireless networks and vehicle to everything (V2X) communications.Leaky-wave antennas (LWAs) are suitable candidates for 5G mm-wave applications due to their beam-scanning capability, compactness, low cost, and ease of fabrication.Substrate integrated waveguide (SIW) and half-mode substrate integrated waveguide (HMSIW) are suitable candidates for realizing LWAs because of their low-profile and integration capability.Several design approaches were introduced in this dissertation to improve the performance of SIW/HMSIW LWAs in 5G mm-wave applications. Some of the proposed antennas have a relatively wide beam-scanning range, suitable for radar systems and V2X communications, while others have small beam-squint, suitable for point-to-point communications and seeker antennas.Tapering the side aperture of an HMSIW and the feed transition of a SIW resulted in side-lobe level (SLL) reduction to enhance the detection accuracy and reduce sensitivity to interference. Applying the proposed methods reduced the SLL of an HMSIW LWA and a SIW LWA to -11.2 dB and -11.4 dB, respectively, in the mm-wave frequency band. I want to thank my wonderful family, Mr. Saeed Javanbakht, Mrs. Mozhdeh Etminan, and Ms. Ayda Javanbakht, for all their supports. I also want to thank my magnificent supervisors, Prof. Barry Syrett, Prof. Rony E. Amaya, and Prof. Jafar Shaker, for their supports and guidance during my Ph.D. studies, as they are like mentors and role models to me. I am grateful to the Ph.D. examination committee, Prof. Dereck McNamara, Prof.