Multi-port broadband cancellation type sensor based on composite right/left hand transmission line

The invention discloses a multi-port broadband cancellation type sensor based on a composite right/left hand transmission line. The multi-port broadband cancellation type sensor comprises a first annular coupler, a second annular coupler and two connecting lines, two ends of the two connecting lines are respectively connected with two signal output ports of the first annular coupler and a signal input port of the second annular coupler, and the other three ports of the first annular coupler and the second annular coupler can be set as ports of the sensor or tail end loading matching loads according to requirements, therefore, the sensor can be freely tuned among double ports, three ports, four ports and five ports; composite left and right hand branches are respectively loaded in the two connecting lines and are used as a test area, a microfluidic channel is arranged in the test area, and the microfluidic channel is provided with a liquid sample inlet and a liquid sample outlet. The sensor is high in sensitiv