Band-pass filter based on split ring microstrip line

The invention provides a band-pass filter with a new structure, which is achieved by a split ring microstrip line. The band-pass filter includes a microstrip line input-output interface and four coupling resonance loops which are all achieved by microstrip lines. The band-pass filter has the advantages of being steep in transition zone, small in insertion loss, good in standing wave, light in weight, small in volume, high in reliability, good in electric property, temperature stability and batch consistency of electric property, low in cost and capable of producing in bulk, and is applicable to occasions and related systems such as communications and satellite communications of corresponding millimeter-wave frequency bands, which have harsh requirements on volume, electric property, temperature stability and reliability.