Ceramic waveguide filter and manufacturing method thereof

Abstract

The present invention provides a resonant cavity including a plurality of resonant cavities defined by a plurality of through partition walls, the plurality of through partition walls penetrating a single ceramic block to divide regions of the ceramic block according to a predetermined pattern, and at least one coupling hole which is formed between at least two adjacent resonant cavities among the plurality of resonant cavities and penetrates through the ceramic block, wherein a metal layer is formed on the inner side surface of the coupling hole, and at least one slot which is not provided with a metal layer is formed in a predetermined region, so that a parasitic mode can be suppressed by adjusting the formation position and thickness of the at least one slot. The invention provides a ceramic waveguide filter capable of adjusting the coupling level of capacitive coupling and a manufacturing method thereof.

Description

technical field [0001] The present invention relates to a ceramic waveguide filter, and more particularly to a low-loss, high-suppression ceramic waveguide filter. Background technique [0002] With the evolution of communication services, the speed of data transmission is increasing, so the system bandwidth needs to be widened, and the receiving sensitivity needs to be improved and the carrier interference (Interference) of other communication systems needs to be minimized. [0003] To this end, there is an increasing demand for low insertion loss, high rejection filters. Compared with other resonators such as dielectric resonators, coaxial resonators made of metal materials have advantages in terms of loss, size, and price, so they are mainly used to implement filters in mobile communication systems. [0004] However, due to the low power and miniaturization of base station systems such as Massive MIMO antennas, even using existing coaxial resonators, there are still limi...

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Problems solved by technology

[0012] However, the coupling groove that induces capacitive coupling is formed deeper than the resonant groove, so the thickness of the area where the coupling groove is formed in the ceramic block is very thin, so there is a possibility that this area may be damaged during sintering or handling

And the spurious mode (spurious mode) caused by the resonance of the coupling groove is formed in a frequency band lower than the passband, so there is a limitation that the rejection level (rejection level) in the low frequency band cannot satisfy the required standard

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