Ceramic dielectric waveguide filter

Abstract

The invention is applicable to the field of filters, and provides a ceramic dielectric waveguide filter. The ceramic dielectric waveguide filter includes at least one ceramic resonator. A first blindhole with an upward opening is arranged downward in the upper surface of the ceramic resonator, and a second blind hole with a downward opening is arranged upward in the lower surface. The first blindhole and the second blind hole are oppositely arranged, and the first blind hole and the second blind hole are both used for frequency tuning. On the premise of keeping the working mode frequency ofthe ceramic resonator unchanged, the frequency of part of adjacent high-order modes can be raised and kept away from the working frequency, so as to improve the far end suppression performance of thefilter. In addition, the depth required for the first blind hole of the ceramic resonator provided by the invention can be reduced the under the same design size and working frequency, so that the ceramic resonator can be machined and formed, electroplated and debugged in the later period more easily.

Description

technical field [0001] The invention belongs to the field of radio frequency and microwave filters in the field of wireless communication, in particular to a ceramic dielectric waveguide filter. Background technique [0002] A ceramic dielectric waveguide filter is a frequency selective device that uses a specific ceramic material as a carrier and consists of multiple ceramic resonators cascaded. With the rapid development of wireless communication technology, the market has increasingly stringent requirements on the performance and volume of communication base station equipment. Ceramic dielectric waveguide filters have broad application prospects in the future due to their compact size and relatively high quality factor. Since the resonant frequency of the high-order mode of the ceramic resonator is closer to the fundamental mode, the ceramic dielectric waveguide filter is often inferior to the traditional metal coaxial cavity filter in the far-end harmonic suppression pe...

AI Technical Summary

Problems solved by technology

Since the resonant frequency of the high-order mode of the ceramic resonator is closer to the fundamental mode, the ceramic dielectric waveguide filter is often inferior to the traditional metal coaxial cavity filter in the far-end harmonic suppression performance. If an additional cascaded low-pass filter is used to improve Far-end harmonics will sacrifice key indicators such as passband insertion loss and product size

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