A non-contact low passive intermodulation waveguide connection structure and design method

Abstract

The invention discloses a non-contact low passive intermodulation waveguide connection structure and a design method. Periodic metal protrusions are designed on the outer wall of the waveguide as a first connection part. A stepped waveguide with matching dimensions is designed at the end of the other waveguide as the second connection part. The first connection part is embedded in the second connection part, and an internal non-contact waveguide connection structure is formed through mechanical connection. Calculate the parameters such as the size of the convex body and the internal spacing of the connecting structure to obtain the appropriate electromagnetic band gap characteristics and realize the suppression of electromagnetic leakage in the structural gap. The non-contact low passive intermodulation waveguide connection structure proposed in the present invention realizes the internal non-contact of the waveguide connection without affecting the electromagnetic transmission, eliminates the contact nonlinearity of the traditional connection, and effectively suppresses the passive intermodulation effect. And reduce the requirements on materials, processing and assembly technology. At the same time, it has the advantages of broadband, compact structure, strong tolerance, etc., and can be applied to various high-power and low passive intermodulation microwave components and test systems.

Description

technical field [0001] The invention relates to a non-contact low passive intermodulation waveguide connection structure and design method, which can be used in various high-power low passive intermodulation microwave components and test systems, and belongs to the field of microwave technology. Background technique [0002] Passive Intermodulation (PIM) effect is an important interference phenomenon in communication systems, which widely exists in various high-power microwave passive components and connection structures. The main mechanism of passive intermodulation is contact nonlinearity and material nonlinearity. Material nonlinearity can be avoided by choosing appropriate materials, while contact nonlinearity generally exists in various microwave passive structures. The waveguide structure is one of the most widely used structural forms in various high-power microwave systems, and the waveguide flange connection is the primary factor for passive intermodulation in the w...

AI Technical Summary

Problems solved by technology

In addition to the structure of the pressurized table, the high-pressure flange also needs to ensure a high enough smoothness of the contact surface and precise torque tightening, which has high requirements for processing and assembly technology, and due to the existence of contact, it is impossible to fundamentally eliminate contact nonlinearity , there is a long-term reliability problem

The dielectric film isolation method cannot be used in actual products due to reliability issues

Although the choke (choke) flange avoids part of the electrical contact, but because its main structure is a quarter-wavelength choke slot, it cannot achieve broadband performance, and the working bandwidth is narrow, which is also limited in practical applications.

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