| 摘要 |
PURPOSE: An RF(Radio Frequency) filter is provided to receive various wireless communication services through one radio equipment by selectively transmitting and receiving the various frequency bands of radio frequency signals. CONSTITUTION: A first port(110), a second port(120), and a third port(130) transmit and receive a radio frequency signal to the outside. A first filter section(140) filters the radio frequency signal inputted through the first port. A second filter section(150) filters the radio frequency signal inputted through the third port. A switching section(160) controls the opening or short circuit of the second port and the third port. The switching section filters the first radio frequency signal inputted through the first port. An impedance matching section(170) matches input impedance with output impedance to the first filter section. The impedance matching section matches the input impedance with the output impedance to the second filter section. |
