| 摘要 |
PROBLEM TO BE SOLVED: To enhance an insertion loss characteristic of an isolator that is one of major components of a mobile communication unit such as an automobile telephone set and a portable telephone set used at VHF/UHF band by improving the magnetization distribution of a ferrite disk in the isolator. SOLUTION: In the irreversible circuit element consisting of a center conductor section 4, where three strip lines are placed in contact onto an upper face of a ferrite disk at an angular distance of 120 degrees through electric insulation, one terminal of which is connected to a matching capacitor and the other terminal of which is connected to a ground face 3, the matching capacitors, a termination resistor 24 connected in parallel with one of the three matching capacitors, input output terminals 22, 23, ground terminals 25, 26, and magnetic cases 1, 14 that have shield and magnetic path effects, a dielectric layer with an excellent high frequency characteristic is placed between a lower side of the ferrite disk and the ground face 3 opposite thereto.
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