A Method for Determining the Length of the Spacer Membrane in a Filter Resonant Cavity

Abstract

The invention provides a determination method for membrane lengths between filter resonant cavities, and relates to the technical field of electronics. Data of the lengths of membranes and the number of turns of spiral coils and the like between the resonant cavities are obtained through simulation software; a basic filter shell is manufactured according to a simulation result; sleeve membranes of different lengths are manufactured; and the sleeve membranes of different lengths are used for debugging in a matching manner to obtain the final membrane lengths. The determination process for the lengths of the four membranes between the filter resonant cavities is reversible, and can be realized quickly through sleeve membrane replacement; in the test process, the plating layer in each cavity is not damaged; the suppression indexes can be adjusted accurately; the subsequently debugged insertion loss indexes are more accurate relatively; the test process can be completed by only depending on a detection instrument; the sample and the sleeve membranes are low in material cost in the manufacturing process; a low electroplating cost is realized, and the material can be recycled; and in addition, the method and the technological steps are simple, and the reversible adjustment function, high practicability, good use effect and convenience in popularization and use can be realized.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a method for determining the length of a filter diaphragm. Background technique [0002] The length of the four diaphragms between the resonant cavities of the five-section spiral filter is the key dimension that determines the out-of-band suppression index of the filter. After the simulation of the filter cavity is completed, the four diaphragms between the filter resonant cavities need to be Adjust the length of a diaphragm and the difference between the two pairs of diaphragms. After the length of the diaphragm of the resonant cavity of the filter is determined, the insertion loss and return loss indicators can be adjusted. [0003] There are two existing methods for determining the lengths of the four diaphragms between filter resonant cavities: [0004] One method is to make the four diaphragms the longest resonant cavity according to the simulation results, and then gr...

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Problems solved by technology

[0004] One method is to make the four diaphragms the longest resonant cavity according to the simulation results, and then gradually reduce the length of the four diaphragms with a milling machine; the other method is to make the four diaphragms the shortest resonant cavity according to the simulation results. Then gradually lengthen the four diaphragms gradually with copper skin with self-adhesive glue. This process is repeated, takes a long time, wastes resources, and it is difficult to accurately determine the final size.

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