| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size and also to improve the isolation characteristic of a stacked branching filter. SOLUTION: The 1st and 2nd notch circuits 1 and 2 containing the inductance and capacitor components which are connected in parallel to each other are connected together at one of both ends of each notch circuit to construct a 1st high frequency input/output terminal. A low-pass filter circuit is connected to the other end of the circuit 1 and also to a 2nd high frequency input/output terminal T2. A high-pass filter circuit is connected to the other end of the circuit 2 and also to a 3rd high frequency input/output terminal T3. Then a 3rd notch circuit 3 to which an inductance component L4 and a capacitor component C5 are connected in series is connected between the terminal T3 and a ground electrode.
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