| 摘要 |
The present invention relates to a radio frequency filter comprising a coupler (310) for receiving an input signal through a first port, dividing the input signal, outputting the divided signals through second and third ports, combining signals received through the second and third ports according to phases of the signals, and outputting the combined signal through the first port or as an output signal of the RF filter through a fourth port; and a first filter unit (320) having a first port connected to the second port of the coupler and a second port connected to the third port of the coupler, for having a predetermined frequency filtering characteristic, wherein the first filter unit comprises a first filter (3210) having one end connected to the first port of the first filter unit and the other end that is opened, a second filter (3220) having one end connected to the second port of the first filter unit and a phase shifter (3230) having one end connected to the other end of the second filter and the other end that is opened. |
