| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 89 === In this thesis, we use the quasi-elliptic filter synthesis method, which produces a pair of zeros at finite frequencies to design highly selective bandpass filters. In addition, we use the microstrip square open-loop resonator as a basic unit to implement this kind of filter. We take advantage of cross coupling property of appropriately arranged resonators to produce a pair of finite frequency zeros. The key of designing this filter is to control the coupling and coupling character between two resonators precisely. Hence three basic resonator-coupling structures and the factors that affect the coupling are discussed. Then, two possible signal-feeding structures are discussed, too. Finally, we implement both four-resonator and eight-resonator filters, and the simulation results are in good agreement with the measurement results.
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