| 摘要 |
A diplexer with an impedance matching function reduces a manufacturing cost and minimizes a product size by comprising a circuit by the tuning of a lumped element composed of a capacitor and an inductor. A high band terminal has a first characteristic impedance value and the high band signal is applied to the high band terminal. A low band terminal has a second characteristic impedance value which is greater than the first characteristic impedance and the low band signal is applied to the low band terminal. The mixing signal formed by mixing the high band signal and the low band signal is applied to a mixing terminal. The mixing terminal has the second characteristic impedance value. A high pass filter part(140) is composed of a capacitor and an inductor and passes through the high band signal by impedance-matching in a connection line formed between the high band terminal and the mixing terminal. A low-pass filter part(150) is composed of the capacitor and the inductor and is equipped in the connection line formed between the low band terminal and the mixing terminal, and passes through the low band signal. |
