| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 105 === In this thesis, a miniaturized smart MIMO antenna using reconfigurable frequency selective reflectors is proposed. This antenna can be applied to Wireless Access Point. The operating frequency is 2.4GHz to 2.5GHz in Wi-Fi band and the radiation efficiency is 40% ~ 70%. The size of substrate is 120mm x 120mm x 0.8mm, and the actual antenna size is 120mm x 120mm x 12.3mm, compared to the center frequency of 2.45GHz, is 0.98λx 0.98λx 0.1λ. The combination of the reconfigurable frequency selective reflector’s characteristics between reflection and radiation is designed to reduce the occupied area of the smart antenna unit and the performance of smart antenna unit is not affected by each other. In addition, this antenna can display different radiation patterns by using one to multipath switching feeding network to change each reconfigurable frequency selective reflector’s characteristic, and offer the best signal strength according to the position of the user in different directions.
In this thesis, the design of the MIMO antenna structure is also proposed. The smart MIMO antenna can judge the best switching combination of the reconfigurable frequency selective reflectors with algorithm in communication, if the antenna is installed at indoor environment existing big obstacles like pillars, furniture, etc. With this advantage, the smart MIMO antenna has higher abilities about adaptability and flexibility.
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