Dielectric filter

The invention relates to a dielectric filter, which comprises a dielectric block and a metal layer, wherein the dielectric block is in a right-angle parallelepiped shape and comprises an open-circuitend face, a short-circuit face opposite to the open-circuit end face, an upper surface, an electrode face, a left side face and a right side face, a plurality of resonant holes are arranged on the dielectric block in a penetrating way, one end of each resonant hole is arranged on the open-circuit end face, and the other end of each resonant hole is arranged on the short-circuit face, and the innerwall of each resonant hole is provided with a metal layer, the short circuit surface, the upper surface, the electrode surface, the left side surface and the right side surface are all provided withmetal layers, the metal layers of the resonant holes are electrically connected with the metal layers of the short-circuit surface, the open-circuit end face is provided with a metal pattern layer, the electrode face is provide