Patent ID: 8648672
Filing Date: 2014-02-11
Classification: H03H

Abstract:
1. A filter for forming a plurality of attenuation bands which are determined based on each one of a plurality of transmission bands assigned to communication common carriers in a higher band side or a lower band side than a pass band, the filter comprising: element parts generating series resonance at frequencies each corresponding to the plurality of attenuation bands, said element parts forming sets of element parts, comprising sets constituted by a plurality of said element parts connected to the same electric potential point in a signal path so as to provide a plurality of parallel arms themselves, in order to form the respective plurality of attenuation bands; said sets of element parts constituted by a plurality of said element parts connected to the signal path in a plurality of stages; and an inductor for phase inversion provided in the signal path between said sets of element parts adjacent to each other.