Low-insertion-loss high-balance-degree high-directionality coupler based on IPD technology

The invention discloses a low-insertion-loss high-balance-degree high-directionality coupler based on an IPD technology. The low-insertion-loss high-balance-degree high-directionality coupler comprises a dielectric layer, a metal interconnection line, a metal floor, an input/output port and an isolation port. The metal interconnection line comprises n metal interconnection line units, each metal interconnection line unit adopts a symmetrical spiral structure, and a spiral line of the metal interconnection line unit comprises a middle metal line, and a first coupling line and a second coupling line which are respectively positioned on two sides of the middle metal line; the first coupling line and the second coupling line are not in contact with the middle metal line. According to the invention, energy coupling of the coupler can be effectively controlled by adopting the double-line coupling structure, and the isolation degree between the isolation ports is high by adopting the double-line coupling structure,