Transverse electromagnetic (TEM)-mode coaxial dielectric ceramic filter and manufacturing method for same

Abstract

The invention discloses a transverse electromagnetic (TEM)-mode coaxial dielectric ceramic filter, which comprises a dielectric ceramic block and a surface metal layer. Two dielectric ceramic bodies (21 and 22) are bonded by glass frit, and are sintered to form the dielectric ceramic block. Two grooves (29) with rectangular sections are formed on the bonded face of one dielectric ceramic body (21). After the two dielectric ceramic bodies are bonded, coupling holes (28) are formed. Coupling internal electrodes (31) are arranged on the bonded face of the other dielectric ceramic body (22). The manufacturing method comprises the following steps of: manufacturing the coupling internal electrodes and coupling external electrodes at positions at which the grooves are reserved to form cavities on a large dielectric ceramic block, bonding two large dielectric ceramic pieces by using the glass frit, and sintering the bonded large dielectric ceramic pieces into a whole; cutting the large dielectric ceramic block into strip-shaped dielectric ceramic bodies, and manufacturing side electrodes; and cutting the strip-like dielectric ceramic bodies into single elements, and manufacturing end electrodes. The manufactured product has high dimensional accuracy and high parameter consistency. The coupling internal electrodes on the bonded faces can be designed according to needs, so that the performance of the product can be further improved, and design flexibility can be enhanced.

Description

technical field [0001] The invention relates to a structure of a TEM mode coaxial dielectric ceramic filter and a manufacturing method thereof. Background technique [0002] TEM mode (transverse electromagnetic wave mode) coaxial dielectric ceramic filter can be used in wireless communication, navigation, RFID, radar, base station and other equipment. The junction of the traditional TEM mode coaxial dielectric ceramic filter is as follows figure 1 As shown, a dielectric ceramic block 11 and a surface metal layer 12 are included. The center of the dielectric ceramic block has two cavities 14 through which both ends are connected. The surface metal layer 12 includes an input electrode, an output electrode 15 and a surface electrode 13 . This TEM mode coaxial dielectric filter is usually molded by dry pressing or hot pressing, and then sintered to form the final dielectric body. Due to factors such as pressure changes during molding and inconsistent shrinkage during sinteri...

AI Technical Summary

Problems solved by technology

Due to factors such as pressure changes during molding and inconsistent shrinkage during sintering, it will affect the consistency of the final product batch

For products with a large length, there is still a problem that the shrinkage in the middle position is greater than that at both ends, resulting in irregular deformation.

Moreover, when manufacturing dielectric filter products of different sizes, different molding dies need to be processed, the production cycle is longer and the cost is higher

Images