| Summary: | 碩士 === 大同大學 === 通訊工程研究所 === 88 === The characteristics of four kinds of narrow bandpass filter are studied in this paper. They are coplanar waveguide coupled-line filter with floating strips, single H-shaped filter, dual H-shaped filter, and dual-mode square ring filter. The common characteristic is very narrow bandwidth about 1.5% ~ 3%. The software package IE3D version 5.23 is adapted to analyze them. Bandwidth, center frequency, return loss, and insertion loss of these filters are studied and are compared with measured results. We can adjust the size of the filter to get better results.
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