| Summary: | 碩士 === 東海大學 === 電機工程學系 === 106 === In this study, we proposed 5 different wideband bandpass filter which are all based on the stub loaded bandpass filter. They are type I (single stepped-impedance transmission line), type II (double stepped-impedance transmission line), type III (π shape transmission line), type IV (single T shape transmission line) and type V (double T shape transmission line). By using ABCD matrix, the transmission line of stub-loaded bandpass filter can be replaced by these 5 types transmission lines.
Type I and type II filter are separately using single stepped impedance lines and double stepped impedance lines. Both of them have advantages such as compactness and wide stopband. Type III filter is using π shape transmission lines, this filter has advantage such as compactness. Type IV and type V are separately using single T transmission lines and double T transmission lines, both of them have the advantages such as compactness and wide stopband.
These five types filters all have simulation and measured results, and a good agreement between simulations and measured results. Hence, if the requirement is wideband, compactness and wide stopband bandpass filter, these five filters are effective and feasible.
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