Filter group delay equalization device based on defected ground negative group delay unit

The invention provides a filter group delay equalization device based on defected ground negative group delay units. Comprising a dielectric substrate, and a first resonant coupling structure, a second resonant coupling structure, a first DGS open-circuit resonator, a second DGS open-circuit resonator, a first open-circuit stub resonator, a first port, a second port, a fourth open-circuit stub resonator, a fifth open-circuit stub resonator, a resistor R1 and a resistor R2 which are arranged on the dielectric substrate. The first DGS open-circuit resonator comprises a second open-circuit stub resonator and a first defected ground negative group delay unit; the second DGS open-circuit resonator comprises a third open-circuit stub resonator and a second defected ground negative group delay unit; the first defected ground negative group delay unit is located on the left side of the second open-circuit stub resonator; the second defected ground negative group delay unit is positioned on the right side of the third