A filter chip includes multiple series-arm resonators arranged in series
arms of a ladder arrangement, and multiple parallel-arm resonators
arranged in parallel arms of the ladder arrangement. A common line is
connected to first electrodes of at least two parallel-arm resonators
among the multiple parallel-arm resonators. Second electrodes of said at
least two parallel-arm resonators are connected to associated series-arm
resonators among the multiple series-arm resonators.