International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)
183 A Improved Hairpin-Comb Bandpass Filter with Tapped Open Stubs
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Tapped open stubs are applied to the hairpin-comb bandpass filters to improve the skirt selectivity on both sides of the passband. Two attenuation poles are produced by this new structure. The upper band pole is introduced by the hairpin-comb structure. The lower band pole is introduced by the tapped open stubs. All these features are confirmed by measured results.