Microstrip filter based on electromagnetic mixing coupling

The utility model discloses a microstrip filter based on electromagnetic mixing coupling, comprising a microstrip plate metalized through hole, a first resonator, a second resonator, a third resonator, an input port feeder line and an output port feeder line which are connected to the ground and positioned on the microstrip plate; the terminals of the first resonator, the second resonator and the third resonator are connected to the metalized through hole; the first resonator and the third resonator are symmetrical relative to the second resonator which is used as a center line; the input port feeder line and the output port feeder line are respectively symmetrically distributed on the outer sides of the first resonator and the third resonator. The microstrip filter can adjust the intensity of the magnetic coupling and the electric coupling and can further flexibly control the width of the filter, and is small in volume.