Circuit system and method for improving antenna isolation, and communication device

Abstract

The application provides a circuit system and method for improving antenna isolation, and a communication device. The circuit system comprises a first antenna and a second antenna with spatial electromagnetic coupling; a first power dividing network, a first transceiving end of which is used for inputting or outputting a radio frequency signal, the first power dividing network comprising a first branch and a second branch connected in parallel to the first transceiving end, and the second branch being connected to the first antenna through a first matching network; a second power dividing network, a first transceiving end of which is used for inputting or outputting a radio frequency signal, the second power dividing network comprising a third branch and a fourth branch connected in parallel to the first transceiving end, and the fourth branch being connected to the second antenna through a second matching network; and a phase shifter connected between the first branch of the first power dividing network and the third branch of the second power dividing network. The application adds a controllable electrical path, so that the energy transmitted by the electrical path and the energy coupled in space are equal in amplitude and opposite in phase at the target antenna, thereby improving the isolation.

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