| 摘要 |
PROBLEM TO BE SOLVED: To provide a high frequency coupler whose isolation characteristic can be enhanced. SOLUTION: In the high frequency coupler 20 of this embodiment, an impedance matching circuit (capacitors C11, C12) to match a line impedance when viewing from other end P3 of a sub line SL while one end P4 of the sub line SL is connected to a prescribed termination resistor RL with a prescribed value of 50 ohms is layered in a multilayered board. Selecting the impedance of a side of a circuit network connected to the other end P3 of the sub line SL to be the prescribed value of 50 ohms matches the impedance of the both. Since the sub line SL can output a high frequency signal coupled with the sub line SL from the sub line SL to the circuit network without waste, the amount of the high frequency signal supplied to the one end P4 of the sub line SL can be reduced. Thus, the isolation characteristic can be enhanced.
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