Capacitive coupling structure of dielectric filter, design method and dielectric filter

Abstract

The invention relates to a capacitive coupling structure of a dielectric filter, a design method and the dielectric filter. The capacitive coupling structure comprises a dielectric block and a metal layer. On one hand, the capacitive coupling bandwidth of the capacitive coupling structure of the dielectric filter needs to be adjusted, the distance H1 between a bottom wall of a first blind hole anda second surface is changed to correspondingly adjust, specifically, for example, a narrow-band dielectric filter is manufactured, the bandwidth of capacitive coupling is reduced by increasing the distance H1 between the bottom wall of the first blind hole and the second surface, the distance H1 with a large enough numerical value can be selected to process the narrow-band dielectric filter, so that production and processing can be facilitated, and the production efficiency is relatively high, on the other hand, a hole wall of a conical hole section is obliquely arranged relative to a first surface, so that the metal layer can be conveniently formed on the hole wall of the first blind hole, a cutting tool (including a cutter, laser and the like) can be conveniently adopted to perform machining operation on the metal layer of the conical hole section, and the production efficiency can be further improved.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a capacitive coupling structure of a dielectric filter, a design method and the dielectric filter. Background technique [0002] A dielectric filter is a microwave filter that uses a dielectric resonator to achieve frequency selection through multi-stage coupling. The surface of the dielectric filter is covered with a metal layer, and the electromagnetic wave is confined in the dielectric body to form a standing wave oscillation. Traditionally, the capacitive coupling structure of a dielectric filter includes a dielectric body. The medium body is provided with a medium cavity, and a through hole is provided through the bottom wall of the medium cavity, and a closed annular gap is provided on the hole wall of the through hole, the bottom wall of the medium cavity, or the metal layer on the surface of the medium cavity, so as to To achieve the purpose of capacitive coupling. How...

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Problems solved by technology

However, for a narrow-band dielectric filter, when the bandwidth of capacitive coupling needs to be reduced, the depth H1 of the through hole is correspondingly reduced. When the depth H1 of the through hole is reduced to 0.1mm, it will cause inconvenience. Manufacture and form through holes and closed annular gaps on the dielectric body, the production is difficult and the production efficiency is low

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