Dielectric filter unit and dielectric filter

Abstract

The invention discloses a dielectric filter unit and a dielectric filter. the dielectric filter unit comprises a first dielectric resonant cavity and a second dielectric resonant cavity, and the upper end face or the lower end face of the first dielectric resonant cavity is provided with a first frequency hole; the second dielectric resonant cavity is connected with the first dielectric resonant cavity, a second frequency hole is formed in the upper end face or the lower end face of the second dielectric resonant cavity, a coupling groove is formed in the joint of the first dielectric resonant cavity and the second dielectric resonant cavity, and a third frequency hole is further formed in the joint of the first dielectric resonant cavity and the second dielectric resonant cavity. And the third frequency hole is matched with the coupling groove, so that a third resonant mode is excited in the double-cavity structure, and the dielectric filter completes realization of three transmission modes under the condition that only the physical forms and the volume sizes of the two cavities are used, thereby achieving the performance of a third-order filter, generating an out-of-band transmission zero point at the same time, and having relatively high debuggeability and producibility.

Description

technical field [0001] The invention relates to the field of communication equipment, in particular to a dielectric filter unit and a dielectric filter. Background technique [0002] When the electromagnetic wave propagates in a material with high dielectric constant, its wavelength can be shortened. Using this theory, dielectric materials can be used instead of traditional metal materials. Under the same index, the volume of the filter can be reduced. Research on dielectric filters has always been a hot spot in the communication industry. Filters are important components of wireless communication products, and dielectric filters are of great significance to the miniaturization of communication products. [0003] Dielectric filters are usually composed of multiple resonant cavities. The more resonant cavities, the higher the order of the filter, and the better the suppression performance, but it often leads to the larger size of the dielectric filter. At present, the genera...

AI Technical Summary

Problems solved by technology

[0003] Dielectric filters are usually composed of multiple resonant cavities. The more resonant cavities, the higher the order of the filter, and the better the suppression performance, but it often leads to the larger size of the dielectric filter. At present, the general dielectric filter cannot Taking into account the requirements of volume, multi-resonance mode and suppression performance

Images