| 摘要 |
The present invention relates generally to electronic devices, and more particularly to a system and method for radio frequency filters. According to one embodiment, a circuit comprises a plurality of filter circuits each having a first port, a second port, and a third port. In this case, the second port of the first filter circuit among the filter circuits is coupled to the first port of the second filter circuit among the filter circuits. Each of the filter circuits includes a first passive filter, a second passive filter, a first coupler, and a combining network. The first coupler includes an input port coupled to the first port, a separated port coupled to the second port, a first phase-shifted port coupled to the first passive filter, and a second phase-shifted port coupled to the second passive filter. The combining network includes a first input coupled to the first passive filter, a second input coupled to the second passive filter, and an output coupled to the third port. |
