Three-cavity packaging shield box for microwave filter and method for producing same

Abstract

The invention is a microwave filter tri-cavity package screening box and its producing method, installing two plug-type filter active screening barriers on the base of a filter box, and the box base is uniformly separated y the two barriers into three-cavity package screening box; a superconductive material layer and a gold-plated layer at the bottom of filter working piece are terminated at the end of medium filter screening cavity body; it is composed of the following procedures: 1. fixedly welding the filter working piece in the cavity of filter base; 2. welding two standard SMA connectors of the filter working piece;3. fixing two active screening barriers in locating sockets of the box base to form screening cavity closed around filter soldered dots; 4. installing a box cover on the box base. The advantages of the invention: adopting a structure with three independent isolating screening cavities, forming two screening cavities in two input-output soldered dots of the filter, reducing the bad effect of the filter soldered dots on the filter performance, and increasing product yield.

Description

(1) Technical field: [0001] The invention relates to a microwave filter shielding box and a production method thereof, in particular to a microwave filter three-cavity packaging shielding box suitable for ordinary microstrip line microwave filters and high-temperature superconducting microwave filters and a production method thereof . (two) background technology: [0002] For microwave filters, the size and shape of the inner cavity of the packaging box and the welding and assembly of the filter working pieces will have a greater impact on the performance of the filter. However, microwave design software is currently being used to analyze the frequency characteristics of the filter. In computer simulation, generally only the planar circuit structure of the filter work piece can be simulated, and it is difficult to carry out quantitative and accurate calculation of the welding points of the filter work piece, but often the welding inconsistency of the welding point part cause...

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Problems solved by technology

[0002] For microwave filters, the size and shape of the inner cavity of the packaging box and the welding and assembly of the filter working pieces will have a greater impact on the performance of the filter. However, microwave design software is currently being used to analyze the frequency characteristics of the filter. In computer simulation, generally only the planar circuit structure of the filter work piece can be simulated, and it is difficult to carry out quantitative and accurate calculation of the welding points of the filter work piece, but often the welding inconsistency of the welding point part causes the filter The performance of the filter deteriorates, resulting in a low yield of the filter

At the same time, within the operating frequency range of the microwave filter, the applied 50 ohm port matching impedance has strict requirements on the width of the microstrip transmission line, so the size and position of the solder joints of the filter work piece are subject to greater influence. The limitation caused great inconvenience to both design and production

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