Improved Compact Broadband Bandpass Filter Using Branch Stubs Co - via Structure with Wide Stopband Characteristic
作者： Lih-Shan Chen , Ding-Bing Lin , Jian-Yi Li , Wen-Jeng Lin , Chin-Sheng Chang
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摘要: In this paper, a broadband bandpass filter (BPF) with superior spurious suppression over wide frequency range at least up to 20GHz -20 dB has been designed. The proposed designed using quarter-wavelength short stubs alternating branch co-via structure, and inserting the bandstop filters substitute for redundant connecting lines. Compare some traditional work by construct not only reduce size around 70% but also decrease radiation loss due complex meander configurations occurring in For prototype filter, center frequencies 4 GHz were selected. bandwidth of passband was between 1.95GHz 6.25 GHz, which insertion-loss amounts -1.5 dB. stopband is 8.2–20.3
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