Compact dual-band bandpass filter with controllable bandwidths using stub-loaded multiple-mode resonator
作者： F.C. Chen , Q.X. Chu , Z.H. Li , X.H. Wu
DOI: 10.1049/IET-MAP.2011.0523
关键词:
摘要: A compact microstrip-line dual-band bandpass filter using a stub-loaded multiple-mode resonator is presented. This formed by loading three stubs (one short-circuited and two open-circuited stubs) in shunt to simple uniform impedance the centre symmetrical locations, respectively. By properly adjusting lengths of stubs, first resonant modes this can be allocated within passband, whereas third fourth second passband filter. results formulation novel with compact-size high isolation between passbands incorporating source-load coupling. Two coupling paths are used control bandwidth each independently. To illustrate concept, filters different frequency ratios designed, fabricated measured. Simulated measured found good agreement other, showing that rejection level 15 dB up more than four times obtained.
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