Mini strip line resonator and microwave filter thereof

The invention relates to a micro band line resonator and the microwave filter thereof, belonging to the technical field of microwave communication equipment, where the micro band line resonator comprises three annuluses, one of which contains a gap, the middle parts of the three annuluses are mutually connected, an open end is formed on the two sides, and a bigger gap is formed inside the resonator. The microwave filter of the invention comprises plural micro band line resonator arrays, arranged in parallel and in order, and the input and output supply lines of the microwave filter are connected with the first and last resonators, respectively. The invention has the advantages of low losses, high out band prohibition, sharp transition belt, compact filter structure, small size of the whole, etc.