| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 103 === This thesis consist of two parts: dual mode of feeding structure for single conductor strip leaky wave antenna and four ports beam switching antenna using capacitive gap coupled ACPW resonator.
In the first part, the dual mode of feeding structure for single conductor strip leaky wave antenna is proposed. There is a PEC/PMC wall assumed at the center of the single conductor strip. Firstly, in order to excite dual mode of single conductor leaky wave antenna, the broadband feeding structure which can generate out-of-phase and in-phase signal is designed. In second step, we combine the broadband feeding network and the single conductor strip leaky wave antenna, the antenna will have different radiation characteristic. One mode make main beam toward end fire direction, the other mode can make the radiation behave as long wire antenna.
In our second design, the four ports beam switching antenna using capacitive gap coupled ACPW resonator is proposed. The asymmetric ground of ACPW alters the ground current in purpose, which enhances the radiation from the structure. This characteristic can be well suited in antenna applications. We use the theory of band-pass filter to make this antenna. This antenna will generate different radiation pattern by different feeding signals. The antenna of ACPW structure is easily affected by CPW or micro-strip transmission line. Thus, four ports feeding network of strip-line form that can generate four kinds feeding signal to antenna is presented. The four ports feeding network of strip-line form that can generate four kinds feeding signal to antenna is presented. When the feeding network combine with the antenna using ACPW resonator coupled capacitive gap, we can obtain the beam switching antenna by feeding different port.
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