BALANCE FILTER AND BRANCHING FILTER

摘要

PROBLEM TO BE SOLVED: To provide a balance filter or a branching filter which can significantly improve the amplitude balance or the phase balance. SOLUTION: The balance filter and branching filter have a filter (10) with at least one unbalanced-type signal terminal, a lumped constant-type balun (40) for inputting or outputting signals, which are input or output from an unbalanced-type signal terminal (T1) of the filter as signals with different phases, and a ground inductor (LG2) connected in between the ground and a node (NG2) common to at least one ground terminal of the filter and at least one ground terminal of the balun. COPYRIGHT: (C)2008,JPO&INPIT