| Summary: | 碩士 === 元智大學 === 通訊工程學系 === 101 === Broadband technology was developed quickly with modern high-speed and high-quality communicating transmission. There are a lot of challenges for this kind of emerging technology. How to design an antenna element, enabling it to work efficiency over broadband frequency. The other challenge is to layout broadband antenna feeding systems, which include feeding network、converter、coupler and phase shifter. Using Butler Matrix is able to have accurate output phase and level. Moreover, due to the simple and easy characteristic of the circuit structure designing, it’s more easy to accomplish. Using a microstrip can be used to make circuit integration much more east and achievable.
This thesis is about the research of Butler Matrix. It can be divided into two parts, one is as the starting point for a single frequency 12.45GHz used in military satellite communications, and the other is structure of Butler Matrix designed to two- layer broadband LTE frequency band for mobile communication requirements future. This will provide a platform for a new generation of mobile wireless broadband technology. These two kind of Butler Matrix have been implementing and measuring to verify the simulation results, and broadband Butler Matrix can reach 0.7GHz ~ 2.7GHz proportioned bandwidth. All kinds of Butler Matrix are with directional antennas. We used Quasi-Yagi antenna for 12.45GHz band, the advantages of Quasi-Yagi antenna are easy to layout and low cost. And we used Vivaldi antenna for LTE band. Finishing implementation, Butler Matrix are produced by engraving machine, and Vivaldi antenna is manufactured with etching machine. Eventually, using chamber(non-reflective laboratory) measurement system from Yuan Ze University communications center that provides verified far-field pattern. The results of measurement have been consistent with the simulation.
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