A kind of dielectric waveguide ceramic filter and its preparation method

Abstract

The invention provides a dielectric waveguide ceramic filter, comprising: an integrated negative coupling structure; at least one of the upper and lower surfaces of the integrated negative coupling structure is provided with a negative coupling blind hole, and at least one of the left and right surfaces is provided with a coupling Blind hole; the metal plating compounded on the surface of the integrated negative coupling structure. The dielectric waveguide ceramic filter provided by the present invention makes full use of three-dimensional space to set blind holes to obtain an effective and practical negative coupling structure, which not only solves the original situation that the upper and lower wall thicknesses may be thinner by loading blind holes between two resonators , and solve the situation that the wall thickness between the two blind holes is thinner by loading two blind holes between the two resonators and changing their distance to adjust the coupling amount, so as to make full use of the space of the product, and propose a A new negative coupling realization method; and it can form a product with good density uniformity and small deformation at one time, so that the product is stable and reliable, and meets the requirements of high-efficiency and mass production.

Description

technical field [0001] The present invention relates to the technical field of filters, and more specifically relates to a dielectric waveguide ceramic filter and a preparation method thereof. Background technique [0002] With the development of the communication field, the miniaturization, light weight and high performance of filters have gradually become a trend. Dielectric waveguide filters have the characteristics of small size, high Q value, and light weight, which meet the current development requirements of filters. Therefore, the design of dielectric waveguide filters has become a hot research topic in the current communication field. [0003] With the rapid development of microwave communication, dielectric waveguide filters are required to have better out-of-band attenuation, so the negative coupling design method that meets mass production has become the focus of filter research. However, due to the small size of the dielectric waveguide filter, the design of th...

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Problems solved by technology

However, due to the small size of the dielectric waveguide filter, the design of the negative coupling should fully consider the space of the product, and it is necessary to avoid the situation that the wall thickness of the product is thinner due to the large space occupied during the design, so the design of the negative coupling has also become a Difficulties of Dielectric Waveguide Filters

[0004] In the prior art, there are mainly two technologies for realizing the negative coupling of two resonators: (1) In the design, according to the amount of negative coupling required between the two resonators, the upper and lower surfaces between the two resonators Add a blind hole in between, and change the depth of the blind hole to make them reach the required amount of negative coupling; however, only by adding a blind hole to achieve the amount of negative coupling will eventually lead to the gap between the upper and lower surfaces of the product because the depth of the blind hole may be relatively deep. If the wall thickness is too thin, it is difficult to meet the actual mass production design requirements, so the adjustment by adding blind holes on the upper and lower surfaces has certain limitations

(2) In the design, according to the amount of negative coupling required between the two resonators, by adjusting the distance between the two blind holes or changing the depth of the two blind holes, they can achieve the required amount of negative coupling; Although the implementation method of negative coupling can solve the situation that the upper and lower walls may be thinner, it needs to reserve a larger position in the same space to meet the simultaneous existence of two blind holes in the same space. Under the premise of the current product miniaturization, it is not necessary There must be enough space between the two resonators to allow two blind holes to exist in one space at the same time, and two blind holes that are closer together also increase the difficulty of production, so they also have certain limitations

[0005] In addition, the dielectric waveguide filter in the prior art is usually formed by dry pressing. The density uniformity of the product obtained by this method is relatively poor, the deformation of the product after burning is large, and the hole cannot be formed on the side of the dielectric waveguide filter. Realized by CNC processing, low efficiency and poor precision

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