A plurality of gate lines formed on an insulating substrate, each gate line including a pad for connection to an external device; a plurality of data lines intersecting the gate lines and insulated from the gate lines, each data line including a pad for connection to an external device; and a conductor overlapping at least one of the gate lines and the data lines are included. The system is implemented with a sampler of sufficient aperture bandwidth to capture the signal in question, operated at a clock frequency, dynamically chosen as a function of fLO and the desired fIF, to minimize in-band intermodulation products. Therefore, in the process of returning empty containers, each of the containers can be detached and form a whole piece, so as to reduce the space occupied.