Book

This book presents the fundamental concepts, design methodologies, and analysis of millimeter-wave Butler matrices for switched-beam antenna applications. It covers the principles of beamforming networks, microwave components, phase shifters, couplers, and antenna array integration. The proposed antenna system is designed to operate at 35 GHz. Initially, an inset-fed microstrip patch antenna is designed and analyzed as the radiating element. Subsequently, a passive beam-switching network based on a 4 × 4 Butler Matrix is designed and modeled at the same operating frequency. The outputs of the Butler Matrix are connected to a linear 1 × 4 antenna array to achieve beam steering at four different angular directions: +15°, −15°, +45°, and −45°. The complete antenna system is modeled and simulated using Ansys HFSS, a three-dimensional electromagnetic simulation tool. The book provides a systematic approach to the design, integration, and simulation of a millimeter-wave switched-beam antenna system for applications requiring directional radiation and electronic beam switching.