| Summary: | 碩士 === 國立聯合大學 === 電子工程學系碩士班 === 101 === Microwave filter design frequently uses a lumped-element lowpass prototype, and a series of skills of transformation and approximation are then applied to achieve a distributed circuit that is suitable for layout realization. During the design process, filter’s design specifications are degraded,especially filter bandwidth. In order to enhance the bandwidth forecast, new method was proposed in a literature to reduce the shrinkage of bandwidth, and it was applied for the design of wideband parallel-coupled microstrip bandpass filter. In this paper, the proposed method is used to design two versions of filter that centered at 4GHz and having 50% fractional bandwidth. The circuit parameters of one of the two designs are determined by classical method, and the other one is determined by the literature-proposed method. Layouts of both designed are examined by electromagnetic simulator, implemented and verified by measurements.
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