| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 99 === This paper proposes three designs of antennas. One is the research of the on-chip antenna, another is the research of the novel structure for the decreasing side-lobe and increasing beam steering range leaky-wave antenna, the other is the search of the low relationship multi-input multi-output antenna (MIMO).
For the first topic, a broadband millimeter-wave on-chip antenna is presented here. We design the proposed antenna by using the construction of monopole antenna. To reach the End-Fired radiation pattern, the reflector of the Yagi-Uda construction is used in the research. The proposed on-chip antenna has the combination of two constructions about monopole antenna and the part of the reflector in Yagi-Uda.
Then, the second topic, a novel structure for leaky-wave antenna, is introduced here.
To decrease back lobe, we can design slots on conventional leaky-wave antenna, and utilize the energy of the reflected wave of the leaky-wave antenna. Here, we design the monopole antenna on the open end of leaky-wave antenna. It can utilize the energy of the reflected wave of the leaky-wave antenna to composite the radiation pattern of leaky-wave antenna to increase frequency scanning range. Due to the reflected wave is guided to the monopole, the back lobe level can be decreased by the method.
Finally, the third topic, the high isolation multi-input multi-output (MIMO) antenna is presented. We use some method to decrease the relationship between two antennas like orthogonal quadrature hybrid and resonator. Because the MIMO antenna is designed to apply to the personal motion communication device, the radiation pattern is designed to be omni-directional.
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