Communication device, dielectric filter and capacitive coupling structure and design method thereof

Abstract

The invention relates to a communication device, a dielectric filter and a capacitive coupling structure and a design method thereof. The capacitive coupling structure of the dielectric filter comprises a dielectric block. In the production process, on one hand, the deviation between the depth H1 of the capacitive coupling hole and the depth H2 of the frequency modulation hole is within 20%, the situation that the density difference of hole bottoms of all holes of a green body formed by pressing through a mold is too large due to the large hole depth difference can be avoided, and then the situation that in the green body firing process, the deformation difference of all the holes is large can be avoided; in other words, it can be guaranteed that the difference between the depth of the capacitive coupling hole and the depth of the frequency modulation hole is small after the firing step and is within the preset range, so that the product production quality is high, the mold size does not need to be repeatedly adjusted, and production and manufacturing are convenient; and on the other hand, the thickness of the bottom wall of the capacitive coupling hole is relatively increased, so that the quality problem of deformation of the bottom wall of the capacitive coupling hole due to relatively small wall thickness in the firing process of the green body can be avoided, namely, the product quality of the dielectric block obtained by firing the green body can be ensured.

Description

technical field [0001] The invention relates to the technical field of filters, in particular to a communication device, a dielectric filter, a capacitive coupling structure and a design method thereof. 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 dielectric body is provided with two frequency modulation holes and a capacitive coupling hole arranged between the two frequency modulation holes. However, for narrow-band dielectric filters, when the bandwidth of capacitive coupling needs to be reduced, the depth of the capacitive coupling hole should be increased accordingly. However, when...

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Problems solved by technology

In this way, when the dielectric body is sintered and formed, the bottom wall of the capacitive coupling hole is prone to deformation, which makes it inconvenient to process and form a capacitive coupling hole that meets the requirements on the dielectric body. The product quality cannot be guaranteed, the production is difficult, and the production efficiency lower

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