| Summary: | 博士 === 逢甲大學 === 電機與通訊工程博士學位學程 === 102 === The dissertation presents fractal theories, experiments and antenna design for Minkowski-island-based (MIB) fractal patch and complementary Minkowski-island-based (CMIB) fractal patch. Two antennas are discussed in this dissertation. The first antenna is a compact single-feed stack antenna consisting of a MIB fractal patch with perturbation element for circular polarization (CP) application, also proves the MIB fractal which can reduce antenna&;#39;s area. The second antenna is a single-feed stack antenna consisting of a complementary MIB (CMIB) fractal patch with perturbation element for dual-band and dual circular polarization applications, also presents a new transformation which can be expressed in mathematical form for complementary MIB fractal. Three steps for antenna design are as follow: first, to use fractal theories as designing rules such as fractal dimension, fractal iteration, and to use a mathematical form as being expressed MIB and CMIB fractal geometries. Second, by using commercial software of ANSYS HFSS to analysis antenna&;#39;s features such as AR spectrum, current distribution, radiation patterns, and reflection coefficient. Finally, experiment, verify and discuss by an investigation on those antenna&;#39;s features. The antenna configuration is makeed with double-layer FR4 glass-fiber board. The lower layer is fed by a 50Ω microstrip line with aperture-coupled to the upper fractal patch. The upper layer is fractal patch, and using perturbation element to excite orthogonal mode for CP operation.
|
|---|
