| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 106 === In this thesis, a low cost Fresnel Zone Plate lens antenna was designed, fabricated and measured. The antenna under consideration consists of a horn antenna for generating the spherical wave front, and a Fresnel Zone Plate lens for converting the spherical wave front into the plane wave in far field. Specifically, such a class of Fresnel Zone structures was implemented on a low-cost dielectric substrate, FR4, which is commonly used in microwave region. Different from the guided-wave structure, the wave is scattering, which includes the transmission and reflection, by the thin dielectric slab rather than propagating within it; thus, the energy absorbed by the lossy dielectric is relatively less significant. Additionally, the free-standing dielectric slab is a Fabry-Perot-like structure, the dielectric thickness has to be properly chosen to obtain maximum transmission in the operation frequency bandwidth.
Furthermore, the offset Fresnel Zone Plate lens was also developed to have the main-beam radiate toward an offset angle. This author has implemented several deformed Fresnel Zone plate lenses for observing the offset radiation main-beam angles; the agreement between the measured and simulated results, in general, is good.
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