Adjustable directivity radio frequency coupler

An adjustable directional radio frequency coupler comprises a first sub directional coupler, a second sub directional coupler and at least one combiner, wherein the first sub-directional coupler comprises a first straight-through input end, a first straight-through output end, a first forward coupling end and a first reverse coupling end, and the second sub-directional coupler comprises a second straight-through input end, a second straight-through output end, a second forward coupling end and a second reverse coupling end; the first straight-through input end is connected with the antenna, the first straight-through output end is connected with the second straight-through input end, and the second straight-through output end is connected with an external element. Each combiner comprises two input ends and an output end, and the two input ends of the same combiner are respectively connected with the coupling ends with the same property in the first sub-directional coupler and the second sub-directional couple