Broadband transmission-type reconfigurable intelligent surface unit with side edge coupled feeding

The invention discloses a broadband transmission type reconfigurable intelligent surface unit with side edge coupled feeding, and relates to the technical field of signal transmission. Comprising a transmitting layer, a receiving layer, a first PIN diode, a second PIN diode and a metal through hole, the metal through hole penetrates through the transmitting layer and the receiving layer, and a metal ground is arranged between the transmitting layer and the receiving layer; according to the invention, the transmitting layer and the receiving layer excite a plurality of resonant modes by using coupled feed so as to expand the working bandwidth; the two PIN diodes are reversely fixed on a receiving layer, and the current direction is controlled by electrically controlling alternate on and off of the PIN diodes, so that a stable 180-degree phase difference in a working frequency band is generated by utilizing a current reversal mechanism. And meanwhile, the PIN diode is placed on the second feeder line to realize