Surface acoustic wave filter ceramic package with special shielding effect and method

Abstract

The invention relates to a surface acoustic wave filter ceramic package with a special shielding effect and a method. The surface acoustic wave filter comprises a ceramic substrate and a surface acoustic wave filter chip, the ceramic substrate is provided with a grounding metal part. An electrode is arranged on a circuit loop of the surface acoustic wave filter chip and is connected to a ground metal portion located on the ceramic substrate through a gold ball, wherein the surface of the surface acoustic wave filter chip is coated with a layer of white glue dry film, the edge of the white gluedry film is fixed on a grounding metal part on the upper surface of the ceramic substrate, a metal film layer is arranged outside the white glue dry film, the edge of the white glue dry film is alsofixed on the grounding metal part on the upper surface of the ceramic substrate, and a layer of black glue dry film is arranged outside the metal film layer. According to the invention, the shieldingeffect is good, the size application range is large, the cost is reduced and the product size is reduced by adopting a gold ball embedding mode, and the grounding metal part of the ceramic base is connected with the sputtering metal layer in series to realize the special shielding effect of ceramic packaging, so that the attenuation characteristic of the product is improved, and the product yieldis greatly improved.

Description

technical field [0001] The invention relates to the technical field of surface acoustic wave filter packaging, in particular to a surface acoustic wave filter ceramic package and method with a special shielding effect. Background technique [0002] A surface acoustic wave filter is a frequency-selective device made of surface acoustic wave effect and resonance characteristics. In the prior art, surface acoustic wave filter packaging products are widely used in automotive electronics, radar, communication systems, navigation and In the field of remote sensing equipment, electromagnetic interference refers to any electromagnetic phenomenon that will reduce the performance of a device, equipment or system, or may have adverse effects on living things or substances, in the conduction or electromagnetic field accompanied by the action of voltage and current. Due to the effect of electromagnetic interference, when the signal of the packaged product of the surface acoustic wave fil...

AI Technical Summary

Problems solved by technology

Due to the effect of electromagnetic interference, when the signal of the packaged product of the surface acoustic wave filter propagates in the transmission medium, part of the energy will be converted into heat energy or absorbed by the transmission medium, resulting in a continuous weakening of the signal strength, that is, attenuation, which affects the product yield. , while the current surface acoustic wave filter packaging products have poor shielding effect and serious attenuation

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