| 摘要 |
PROBLEM TO BE SOLVED: To provide a band pass filter comprising a plurality of resonators whose spurious response can be suppressed over a very wide frequency. SOLUTION: The higher order resonance frequency of the resonators 2 being the components of the band pass filter are deviated from each other. For example, in each resonator 2 comprising a cascade connection of a low impedance line 3, a high impedance line 4 and a low impedance line 3, the low impedance line 5 of a small length is placed to the high impedance line block of at least one resonator and any of the characteristic impedance, the length, and the position of the low impedance line 5 is made different among the resonators 2.
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