A filter circuit includes a first resonator and a second resonator each
having a different resonance frequency. The first resonator is included
in a first block, and the second resonator is included in a second block.
The first block further includes a first delay unit connected to the
first resonator. An input terminal divides an input signal to the first
block and the second block. An output terminal combines signals passing
through the first block and the second block and outputs the combined
signal. The first delay unit converts a phase difference between the
signals passing through the first block and the second block to
reverse-phase or nearly reverse-phase.