Abstract: The present invention relates to a dielectric waveguide filter, comprising a dielectric substrate, wherein the dielectric substrate comprises a plurality of resonators; the plurality of resonators are connected to each other; the dielectric substrate further comprises a negative coupling blind hole; the negative coupling blind hole is arranged at a joint between two adjacent resonators; the two adjacent resonators are respectively provided with a tuning blind hole; and the tuning blind hole of one of the two adjacent resonators is connected to the negative coupling blind hole by a first coupling structure. The present invention can effectively suppress parasitic coupling of the dielectric waveguide filter.

Abstract: The present invention relates to a dielectric waveguide filter, comprising a dielectric substrate, wherein the dielectric substrate comprises a plurality of resonators; the plurality of resonators are connected to each other; the dielectric substrate further comprises a negative coupling blind hole; the negative coupling blind hole is arranged at a joint between two adjacent resonators; the two adjacent resonators are respectively provided with a tuning blind hole; and the tuning blind hole of one of the two adjacent resonators is connected to the negative coupling blind hole by a first coupling structure. The present invention can effectively suppress parasitic coupling of the dielectric waveguide filter.

Abstract: Provided is a cavity filter that is one of radio frequency filters. The cavity filter includes a printed circuit board (PCB) substrate including a micro band layer, metal layers for grounding, which are arranged on both surfaces of the PCB substrate, having the micro band layer interposed therebetween, a plurality of standard cavity modules which are arranged on the both surfaces of the PCB substrate, in each of which an open side surface is fixed and sealed onto the metal layer, and a plurality of coupling windows, in each of which a part of the metal layer for grounding is removed to expose a part of the PCB substrate.

Abstract: Provided is a cavity filter that is one of radio frequency filters. The cavity filter includes a printed circuit board (PCB) substrate including a micro band layer, metal layers for grounding, which are arranged on both surfaces of the PCB substrate, having the micro band layer interposed therebetween, a plurality of standard cavity modules which are arranged on the both surfaces of the PCB substrate, in each of which an open side surface is fixed and sealed onto the metal layer, and a plurality of coupling windows, in each of which a part of the metal layer for grounding is removed to expose a part of the PCB substrate.