| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a non-reciprocal circuit element which can improve an isolation property without increasing an insertion loss. Ž<P>SOLUTION: The non-reciprocal circuit element has a ferrite 32 to which a direct current magnetic field is applied by a permanent magnet, and a first center electrode 35 and a second center electrode 36 arranged in the ferrite 32. One end of the first center electrode 35 is connected to an input port P1, and the other end is connected to an output port P2. One end of the second center electrode 36 is connected to the output port P2 and the other end is connected to a ground port P3. A capacitor C1 and a resistor R are connected between the input port P1 and the output port P2, and also a capacitor C3 and an inductor L3 which are chip-type elements constituting an LC resonant circuit and mounted on a circuit substrate are connected between the input port P1 and the output port P2 in series with the resistor R. The capacitor C3 and the inductor L3 are connected through a strip line SL1 formed on the circuit substrate. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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