| Summary: | 碩士 === 國立交通大學 === 電信工程系所 === 97 === In this thesis, a new filter structure has two passbands while exciting differential or common signals is proposed. In microstrip coupled lines, there are different characteristic impedances and phase velocities for even- and odd- mode signals. Using the characteristics, the filters can be realized with both stepped-impedance and uniform impedance resonators. By controlling the coupling strength of the coupled lines, the two passbands can be separated effectively. Based on the resonant characteristics of a stepped-impedance resonator, the first spurious harmonic can be higher than 2fo.
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