| 摘要 |
The present invention relates to a radio frequency filter, wherein a new form of a filter with characteristics different from a general filter is obtained by coupling a hybrid coupler with the general filter. As for the construction thereof, the radio frequency filter includes: a coupler which receives an input signal via a first port for distributing the same to be output to a second port and a third port, and synthesizes signals input via the second port and the third port according to corresponding phases for outputting the same to the first port or a fourth port as output signals of the radio frequency filter; and a first filter section connected to the second and third ports of the coupler respectively at the first and second ports thereof and having preset frequency filtering characteristics. |
