Low passive intermodulation waveguide flange and design method thereof

Abstract

The invention discloses a low passive intermodulation waveguide flange and a design method thereof. Through designing periodic metal convex bodies on conventional flange surfaces, a non-contact structure is formed by arranging the metal convex bodies with another flange surface at a certain distance; through designing and calculating the parameters such as the size of the metal convex bodies and the distance between flanges, appropriate electromagnetic forbidden band characteristics are obtained; therefore, the suppression of electromagnetic wave leakage in flange clearance is realized, and the waveguide flange which is not contacted internally is formed combined with the mechanical connection structure. According to the passive intermodulation waveguide flange disclosed by the invention,through constructing the non-contact electromagnetic band-gap structure, the non-contact between flanges is realized without affecting the transmission of electromagnetic waves between waveguides, thecontact nonlinearity is eliminated, the passive intermodulation effect is effectively suppressed, and the requirements for materials, electroplating, machining and assembly technology are reduced. Meanwhile, the passive intermodulation waveguide flange disclosed by the invention has a wide working bandwidth, which can completely cover the corresponding waveguide working bandwidth, and can be applied to various high-power low intermodulation microwave components and test systems.

Description

technical field [0001] The invention belongs to the field of microwave technology, in particular to a low passive intermodulation waveguide flange and a design method. 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. In order to ensure the normal operation of the communication system, it is necessary to take effective passive intermodulation suppression measures. 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 int...

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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 relia

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