CAPACITIVE AND INDUCTIVE CROSS COUPLING STRUCTURE AND DIELECTRIC WAVEGUIDE FILTER

摘要

The present invention provides a capacitive and inductive cross coupling structure and a dielectric waveguide filter. The capacitive cross coupling structure comprises a dielectric body provided with four resonance parts which are distributed in a matrix and are provided with resonance blind holes, and further comprises four adjusting structures located between the adjacent resonance parts on edges of the matrix, and a coupling blind groove located in the middle of the matrix, with the length direction consistent with the connecting line direction of the two non-adjacent resonance parts. The depth of the coupling blind groove is larger than a half of the thickness of the dielectric body. The resonant blind hole and the adjusting structure are provided on the dielectric body to adjust the resonant frequency of the resonant part. The depth of the coupling blind groove is greater than a half of the thickness of the dielectric body, so that the structure is a capacitive cross coupling structure. The resonance blind holes are placed in a matrix mode, it is guaranteed that the connecting line directions of the coupling blind grooves and the non-adjacent resonance parts are consistent, a pair of zero points can be generated, and therefore the good frequency-selection characteristic and out-of-band rejection performance are provided, and the production quality of products is guaranteed.