TM dielectric resonator is metallized on the ceramic surface to realize one-sided or two-sided contact between the resonator and the cavity. Compared with traditional metal filters, TM mode dielectric resonators made of microwave dielectric ceramics have the advantages of small volume, light weight, high Q value and small temperature drift coefficient; Compared with TE mode dielectric resonator, its volume is smaller. Products can be customized according to customer index requirements.