| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 98 === This thesis covers the development of a multi-function active antenna system which uses logic and switch control circuitry. One of the applications for this system is to be used in Wireless Local Network Area (WLAN) access point (AP) which will assist in improving communication quality and distance.
The main research is on the logic and switch circuitry. It uses the 89S52, the micro-controller, for processing the data. The system also comprises of an array antenna, and RF detection circuit. This thesis will also cover the designing of analog to digital converter (ADC) circuit, the antenna control switch circuit and how the whole system is controlled using C-language making it able to detect the user location.
This multi function active antenna system will combine the peripheral circuit elements. These elements include array antenna, signal strength analysis circuit, display circuit, power circuits for all components which include DVB-T. This project uses parts and components which are easily and commonly available, hence making it a low cost in design. This design also makes it very easy to integrate 2.4GHz WLAN applications.
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