Inverted T-shaped blind hole ceramic dielectric filter and special die thereof

Abstract

The invention discloses an inverted T-shaped blind hole ceramic dielectric filter and a special mold thereof, belongs to the technical field of ceramic dielectric filters, and solves the problems that a plurality of resonance holes or coupling holes are formed in a single surface or multiple surfaces of a ceramic block in the prior art, the surface area of the ceramic block is occupied, and the overall size is increased. The inverted-T-shaped blind hole ceramic dielectric filter is characterized in that two upper holes are downwards formed in the upper surface of the ceramic plate body, lower holes are formed below the two upper holes respectively, the diameter of each lower hole is larger than that of each upper hole, the upper holes and the lower holes are integrally formed into an inverted-T-shaped blind hole in an injection molding mode, and meanwhile a special mold for the inverted-T-shaped blind hole ceramic dielectric filter is provided. The inverted-T-shaped blind hole with the diameter of the lower hole larger than that of the upper hole and the lower hole only communicated with the upper hole is formed through gel casting, a good foundation is provided for sintering and silver plating in the follow-up process, the dielectric constant and the Qf value are improved, insertion loss is reduced, electric energy is saved, and the requirements of 5G communication for miniaturization, light weight, low cost and high performance of the ceramic dielectric filter are met.

Description

technical field [0001] The invention belongs to the technical field of ceramic dielectric filters, in particular to an inverted T-shaped blind hole ceramic dielectric filter and a special mold thereof. Background technique [0002] As one of the core components of the radio frequency unit, the filter is used to eliminate interference clutter, to allow useful signals to pass through without attenuation as much as possible, and to attenuate unwanted signals as much as possible. With the development of communication systems, especially 5G communication, the demand for miniaturization, light weight, low cost, and high performance of filters is obvious. Since ceramic dielectric filters use ceramic substrates to be plated with silver to form resonators, multiple resonators and The coupling between each resonator forms a filter, which can meet the requirements of 5G communication for smaller and smaller filter sizes. An important indicator of ceramic dielectric filters is low inse...

AI Technical Summary

Problems solved by technology

However, the ceramic filter realizes its function by printing the circuit on the surface of the ceramic and welding it with the circuit board. In the prior art, a positive T-shaped hole is processed on the surface of the ceramic block, or multiple resonant holes or couplings are provided on one or more sides. The holes occupy the surface area of ​​the ceramic block. In order to ensure the function of the ceramic filter, the surface area of ​​the ceramic filter must be increased, and the depth of the blind hole will increase the thickness of the ceramic filter; the increase of the surface area and the thickness The increase of the ceramic filter leads to an increase in the overall volume of the ceramic filter, which is contrary to the requirements of 5G communication for the miniaturization and light weight of the filter

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