Band-pass filter and miniaturized CQ topological structure thereof

The invention discloses a band-pass filter and a miniaturized CQ topological structure thereof, the band-pass filter comprises the miniaturized CQ topological structure, an input feed unit, an output feed unit, a first microstrip line and a second microstrip line, and the input feed unit and the output feed unit are respectively coupled with the miniaturized CQ topological structure in a non-contact manner; the miniaturized CQ topological structure comprises a first double-resonator unit, a second double-resonator unit and a cross coupling unit which are arranged on the surface of a dielectric substrate, the first double-resonator unit comprises a first resonator and a second resonator, and the second double-resonator unit comprises a third resonator and a fourth resonator. Each resonator is a quarter-wavelength resonator with one end open-circuited and the other end short-circuited, the short-circuit end is connected to the metal ground on the back of the dielectric substrate through a metalized grounding vi