Analysis, Design, an‎d Simulation of a Multi-Beam Leaky-Wave Antenna (LWA) with Various Polarizations Based on Holographic Technique

5/27/2026 12:00:00 AM

Multi-beam antennas for satellite communications typically provide continuous coverage over a specified field of view using high-gain, pencil-shaped beams. They are vital components in future wireless communication networks. These antennas, with the ability to generate multiple radiation patterns, enable the transmission an‎d reception of signals from different directions, thereby significantly enhancing the efficiency an‎d capacity of communication networks. They offer numerous advantages that make them attractive for various applications in wireless communications an‎d technologies. Furthermore, reviews an‎d literature surveys indicate that leaky-wave antennas, capable of simultaneously supporting multiple polarizations, have recently attracted considerable attention from researchers. This thesis aims to apply the holographic technique an‎d aperture field estimation method in leaky-wave radiating structures with multiple radiation beams, controlling the radiation behavior of the leaky-wave antenna (LWA) through appropriate hologram surface design. Initially, an isotropic holographic LWA is designed an‎d synthesized. To achieve this, a square patch unit cell exhibiting isotropic behavior against surface waves an‎d a monopole launcher as the reference wave source are used to create an omnidirectional conical radiation pattern. In the next step, the aperture field estimation method is employed to implement a multi-beam LWA with various polarizations. To control the polarization of the radiated beams, anisotropic unit cells (rectangular an‎d circular slotted) are utilized to realize the hologram surface in the multi-beam LWA. The advantage of this method over the holographic technique is the simultaneous control of amplitude, phase, an‎d polarization of the aperture field, providing the designer with significant freedom to synthesize diverse beams. The Floquet expansion method, also mentioned, is used for analyzing holographic antennas. Analysis results show that this method can be applied with suitable accuracy an‎d speed for very large structures. Finally, by fabricating an‎d testing a prototype of the designed antennas, the validity of the design procedure is eva‎luated. Good agreement between simulation an‎d measurement results confirms the reliability of the employed design method.

اصل هولوگرافي , روش تخمين ميدان دهانه , آنتن موج نشتي چند پرتويي , سطوح مدوله‌شده امپدانسي

Holographic-principle , Aperture Field Estimation Method , Multi-beam Leaky-wave Antenna , Impedance Modulated Surfaces

Azadkhnghah

Dr. Abdolali