| 摘要 |
PURPOSE: To constitute a low-pass filter that is easy to build, excellent in vibration resistance and in impact resistance and can suppress the effect of a spurious resonance peak. CONSTITUTION: The inner conductors are made integrally connecting a plurality of cylindrical inner conductors 101 to 111 each different in diameter. This inner conductor is disposed inside an outer conductor whose ends are Πa and Πb in diameters with different sizes in half way. The axial lengths len 107, 109, 111 of the inner conductors 107, 109, 111 which form a high impedance section are made shorter than the aixal lengths len 101, 103, 105 of the other inner conductors 101, 103, 105 which form the other high impedance section. The diameters of the inner conductors 101, 103, 105, 107, 109, 111 are made larger than the predetermined minimum.
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