Tuning bolt ground connection structure and RF cavity filter including same

Abstract

Disclosed are a tuning bolt ground connection structure and an RF cavity filter including the same. The disclosed filter comprises: a housing in which at least one cavity is defined; a cover which is coupled to the upper part of the housing; at least one resonator which is received in at least one cavity; at least one hole which is formed on the cover; at least one ground bolt formed with a screw thread on a portion of its outer surface and having a central hole; and at least one tuning bolt inserted into the inside of the housing through the center hole along screw threads formed on the inner surface of the center hole, wherein a flange section in contact with the lower part of the cover and the tuning bolt is formed in the lower part of the ground bolt.; According to the disclosed filter, the generation of PIMD can be minimized in the tuning bolt ground connection structure and sufficient ground area is obtained. Furthermore, there is less impact to the outside environment such as by vibrations.

Description

technical field [0001] The present invention relates to an RF cavity filter, in particular to a ground connection structure of a tuning bolt provided on the RF cavity filter. Background technique [0002] A filter is a device that passes only signals in a specific frequency band among input frequency signals, and is realized in various forms. The bandpass frequency of an RF filter is determined by the inductance and capacitance components of the filter, and the operation of adjusting the filter characteristics such as the bandpass frequency and bandwidth of the filter is called tuning. [0003] figure 1 is a block diagram showing an existing RF cavity filter. [0004] refer to figure 1 , the existing RF cavity filter includes a housing 100 , an input interface 102 , an output interface 104 , a cover 106 , a plurality of cavities 108 and a resonator 110 . [0005] An RF filter is a device that passes only signals in a specific frequency band among input frequency signals,...

AI Technical Summary

Problems solved by technology

[0020] image 3 In the existing tuning bolt grounding structure shown, there are many contact surfaces between metals, especially the grounding part and the filter cover are combined by rivets, which belongs to the structure with non-linear increase in contact. This structure cannot solve the mutual fabrication of distorted signals ( PIMD) related issues

[0021] Moreover, since the grounding part and the tuning bolt are in a line contact state, the contact area is small, and a sufficient grounding effect cannot be achieved, and there is a problem that it is difficult to adapt to external environments such as vibrations.

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