| 摘要 |
PROBLEM TO BE SOLVED: To improve isolation between a second terminal and a third terminal. SOLUTION: For this Wilkinson circuit, a resistor connected between the second terminal 12 and the third terminal 13 is constituted of serially connected first resistance element R1 and second resistance element R2 and an LC parallel resonance circuit is connected between the connection point and the ground. The resonance frequency of the LC parallel resonance circuit is turned to the center frequency of a using frequency band and the LC parallel resonance circuit is prevented from adversely affecting the Wilkinson circuit. When the LC parallel resonance circuit is connected, the isolation between the second terminal 12 and the third terminal 13 is improved.
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