BANDPASS FILTER WITH MULTIPLE ATTENUATION POLES

专利名称：BANDPASS FILTER WITH MULTIPLE

ATTENUATION POLES

发明人：KUNDU, ARUN, CHANDRA申请号：US2006037854申请日：20060929

公开号：WO2007064391A3公开日：20070802

摘要：A bandpass filter includes a combline bandpass filter including tapped-line input(114) and output (115) terminals, at least three resonators (110, 111, 112) , and a loadingcapacitor (121, 131, 141) for each resonator. The bandpass filter further includes aplurality of loading inductors (122, 132, 142) , each loading inductor being connectedbetween one of the resonators and its respective loading capacitor; and a direct couplingcapacitor (150) connected between any two of the at least three resonators that areseparated by at least one other resonator. By adding a direct coupling capacitor to acombline bandpass filter, an additional lower-passband side attenuation pole is created.The attenuation and rolloff characteristics of the lower-passband side can be controlledby altering the value of the direct coupling capacitance. By adding loading inductors to acombline bandpass filter, an upper-passband side attenuation pole is created.

申请人：TDK CORPORATION,KUNDU, ARUN, CHANDRA

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