| Summary: | 博士 === 國立交通大學 === 電信工程系所 === 95 === In this thesis, the shaped-beam antennas were investigated systematically using theoretical analysis and experimental measurement. The basic structure of the shaped-beam antenna contains a line source, taken as an excitation source, embedded in an air substrate sandwiched between a metal reflector and a grating made of metallic or dielectric material. Due to the contribution of leaky wave caused by the grating and direct wave radiating directly from the line source, such a shaped-beam antenna can radiate uniform electromagnetic field pattern over a rectangular plane in front of the antenna. In addition to the fabrication and measurement for the radiation characteristics of this antenna, the rigorous mode-matching method was employed to study the electromagnetic fields within the structure and the radiation far-field pattern, as well. Furthermore, the sensitivity analysis for the parameters including the geometric structure and electrical property of the dielectric material was taken into account to understand the tolerance of this antenna during fabrication. Since this antenna can radiate uniform coverage over a rectangle footprint, it can be a good candidate for serving as the antenna of a hyper LAN (local area network) access point in millimeter wave applications.
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