Balanced filter and duplexer

摘要

A balanced filter includes: a filter (10) that has at least one unbalanced signal terminal (T1) ; a balun (40) that is a lumped parameter balun that inputs or outputs signals with different phases generated based on a signal input or output from the unbalanced signal terminal (T1) of the filter (10), the balun (40) being formed with an integrated passive device; and a mounting unit in which the filter (10) and the balun (40) are flip-chip mounted.