| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-pass filter which is compact, has large attenuation and can be used in a microwave band by making the attenuation large without being made large-sized. SOLUTION: In a distribution constant type low-pass filter having an outer conductor formed by a metal cylinder and a center conductor formed by a metal solid body, wherein the center conductor is inserted into the outer conductor, and the center conductor is configured of a high impedance part formed a metallic column arranged so as to be continuous along the center axis of the outer conductor and a disk-shaped low impedance part extending radially toward an outer diameter side centering on the high impedance part, the low-pass filter being formed such that the high impedance part and the low impedance part alternately continue, a bent part is formed by bending the area of top ends of at least one low impedance parts so as to be parallel with the high impedance part, and one or more parallel C circuits are made to be a parallel LC circuit. COPYRIGHT: (C)2011,JPO&INPIT
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