Coupler and coupling circuit thereof, and communication device

The invention is suitable for the technical field of communication, and provides a coupler and a coupling circuit thereof, and a communication device. The coupling circuit comprises: n coupling ends, wherein n is an integer greater than 1; a power distribution unit, which is arranged between and connected with the first end of a coupling line and the coupling ends, wherein the power distribution unit comprises n output ends, and the power distribution unit is used for averagely distributing the power of a first coupling signal to obtain n second coupling signals with equal power and outputting the n second coupling signals through the n output ends respectively; and n first power regulation units, wherein each first power regulation unit is arranged between and connected with one output end and one coupling end of the power distribution unit, and the first power regulation units are used for performing power regulation on the second coupling signals output by the power distribution unit to obtain target signa