Dielectric waveguide filter

The invention provides a dielectric waveguide filter. The dielectric waveguide filter comprises three interconnected dielectric waveguide resonant cavities and a metallization groove, and the metallization groove is arranged across the interface of two adjacent dielectric waveguide resonant cavities and is connected with the two adjacent dielectric waveguide resonant cavities. A ridge waveguide structure is formed between the metallization groove and the metallization top surface of the dielectric waveguide filter, all the dielectric waveguide resonators work in a TE101 mode during work, and the electric field of the ridge waveguide structure is perpendicular to the metallization top surface of the dielectric waveguide filter. The TE101 mode electric field utilized by the two adjacent dielectric waveguide resonant cavities is also perpendicular to the metallized top surface of the dielectric waveguide filter, so that one resonant cavity in the two adjacent dielectric waveguide resonantcavities can excite the