| 摘要 |
PROBLEM TO BE SOLVED: To provide a coaxial LPF (low pass filter) whose circuit can be prevented from being large without requiring a new place due to the arrangement of the LPF, whose structure is simple and which is easily manufactured. SOLUTION: Insulators 30, 31, 32 and 33 between an inner conductor 10 and an outer conductor 20 of the coaxial type cable 30 are a combination structure of a plurality of dielectrics with dielectric constants different in a line direction, and the inner conductor constitutes a low pass filter as a uniform path or a path with little shape difference. Since, in the configuration, dielectric constants of the dielectrics are basically changed, and a combination of dielectric constants of the dielectrics equivalently forms a capacitor and inductance, the path of the inner conductor does not have to hold an extreme difference in size so that sufficiently excellent LPF characteristic can be realized with a simple structure. COPYRIGHT: (C)2006,JPO&NCIPI
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