| 摘要 |
A band pass filter circuit, wherein the band pass filter passes a frequency band between a first cutoff frequency and a second cutoff frequency with respect to an input frequency of an input signal, the band pass filter circuit includes: a first resonant circuit; a second resonant circuit; a third resonant circuit; at least one of a capacitive circuit and an inductive circuit. The first resonant circuit is connected to a signal line in series and sets a first resonant frequency as the first cutoff frequency. The second resonant circuit is connected to the signal line in series and sets a second resonant frequency as the second cutoff frequency. The third resonant circuit is connected to the signal line in parallel at a node where the first and second resonant circuits are connected, and sets a third resonant frequency as a band-pass center frequency between the first and second cutoff frequencies.
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