| 摘要 |
PURPOSE:To obtain a stable HPF having a few amount of dispersion, by connecting a stripline type inductor having a length of <=lambdag/4, whose stripline length can be adjusted by a movable metal, between two chip type capacitors. CONSTITUTION:Chip type capacitors 4a and 4b are arranged on striplines SL2a-2c provided on a dielectric substrate 1. An Sh type inductor 5 having the length of <=lambdag/4 is connected between the SL2, and an earth electrode 6 connecting to the earth 3 passing through a through hole 7. A part between the appropriate intermediate point 5c of the SL of the inductor 5, and the electrode 6, is soldered with a movable metallic piece 8. Therefore, since the inductance value of the inductor 5 is decided by a length between 5a and 5c, the shape of the inductor 5 is formed in a zigzag pattern, and it is possible to change the inductance value, and to adjust the cut off frequency of the HPF by moving the metallic piece 8, and changing the position of the intermediate point 5c. In this way, unrequired radiation is reduced, and an enough attenuating quantity can be obtained, and the HPF easy to be adjusted and with high reliability, can be obtained.
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