Design and Simulation of Antennas for Millimeter-Wave Communication Systems /

Abstract

Design an antenna in the Milli-Meter Wave (MMW) band could be a very hard task, the designing rules that are used in the designing process for the low band frequencies do not apply in case of high frequencies (from 30 GHz to 300 GHz) which is called Extremely High Frequency (EHF) band. The main objective of this thesis is to propose a technique that could make the designing process in MMW band much easier than before. The main idea of the proposed technique is designing new antennas based on a previously designed one called the reference antennas in order not to start from scratch every time a desired antenna is designed. This technique is applied and tested to design several antennas both single and dual band antenna designs. The utilization of proposed technique proved that it is fast, generic, easy and reliable one. For the single band designed antennas, four high performance antennas are designed and simulated based on this approach using IE3D simulation tool. The reference antenna operates at 77 GHz; its frequency is transformed to make the antennas operate at 35 GHz, 60 GHz, 94 GHz and 120 GHz for each design. For the dual band antennas, the reference antenna operates at dual band of 77 GHz and 98 GHz. Then by applying the same approach, three antennas are designed and simulated based on the previously designed reference one using CST Microwave Studio. The resulted desired first antenna works at dual band of 60 GHz and 77 GHz, the second one works at dual band of 77 GHz and 94 GHz and the last one works at dual band of 94 GHz and 120 GHz. Some modifications are applied to the mentioned technique and to the design in order to increase the limit of operation for the designed MMW dual band antenna and to make maximum benefits from the design without the need to design antennas from scratch; this was demonstrated by two examples, first antenna operate at 60 and 72 GHz while the second one operates at 90 and 117 GHz. I After proving the validity of this technique through this work; the designing process will be easier, especially the optimization step, which could be done also by applying this approach instead of tedious optimization based on the HF software packages.