A Dielectric Waveguide Filter and Its Port Coupling Structure

Abstract

The invention provides a dielectric waveguide filter and its port coupling structure, comprising a coupling inner core and a coupling port, the coupling inner core is located in a through hole penetrating inside the dielectric resonant cavity, and the coupling port is located outside the dielectric resonant cavity; the coupling inner The core includes a first part and a second part arranged sequentially in the through direction, the first part is a conductor, and the second part is a non-conductor, and the coupling strength of the coupling structure can be adjusted by adjusting the size ratio of the first part and the second part; the coupling port Including the inner conductor, the dielectric layer surrounding the inner conductor and the outer conductor surrounding the dielectric layer, the inner conductor is electrically connected to the first part, not only the adjustment method is flexible, convenient and fast, but also bidirectional adjustment; moreover, the coupling port can be used with the connector or It can be used with PCB boards and used in various places; in addition, the process of the port coupling structure provided by the present invention is simple, the requirements for equipment precision are low, and the production input cost and production cycle are greatly reduced.

Description

technical field [0001] The present invention relates to the technical field of filters, more specifically, to a dielectric waveguide filter and its port coupling structure. Background technique [0002] With the development of communication systems, the requirements for filters continue to increase. Limited by the cavity size and weight requirements, the miniaturization and weight reduction of filters has gradually become a trend. Using the high dielectric constant and high Q value of the material, the dielectric waveguide filter can greatly reduce the size and weight of the product, and also has the advantages of small temperature drift. [0003] At present, the port coupling of the dielectric waveguide filter mainly has the following realization forms: [0004] The first is the pattern coupling structure. The inner and outer patterns are added to the port cavity as conductors, and the middle pattern is used as an air medium to cooperate with the PCB board. This method ca...

AI Technical Summary

Problems solved by technology

This coupling method can not only be used in conjunction with connectors, but also in conjunction with PCB boards. However, this method of debugging has a certain one-way, and the coupling cannot be weakened after excessive hole depth debugging

[0006] That is to say, none of the existing port coupling structures can achieve flexible adjustment of the coupling strength.

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