RF Front-End Module Packaging With Cavity-Forming Adhesive Layout
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Solution Overview
Problem
The existing packaging structures for RF front-end modules, particularly those containing SAW and BAW filter chips, suffer from low reliability due to inadequate formation of a cavity structure between the chip and the substrate, leading to potential failures and performance issues.
Innovation Solution
A packaging structure for RF front-end modules that includes a substrate with a support structure and adhesive parts to form a cavity between the filter chip and the substrate, using a first adhesive part to cover the side surface of the filter chip and extend to the top surface, and a filling material to encapsulate the chip and support structure, while minimizing excessive adhesive usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive is applied to cover the entire side surface of the filter chip to form a cavity structure, then the cavity formation is improved, but the adhesive usage becomes excessive and costs increase
Solution Approach 1:
The adhesive is applied selectively to specific regions rather than the entire side surface of the filter chip. The adhesive layer covers the bottom surface of the filter chip and extends to only a portion of the side surface, specifically the region adjacent to the substrate, forming a cavity structure where needed while avoiding excessive adhesive application in areas where it is not required.
2Reliability
If adhesive covers the entire side surface of the filter chip, then cavity structure is formed, but the manufacturing process becomes more complex
Solution Approach 1:
The adhesive application is localized to specific regions: the bottom surface of the filter chip and a portion of the side surface adjacent to the substrate. This selective application simplifies the manufacturing process by reducing the complexity of adhesive patterning while still achieving the required cavity structure formation in the critical areas.
3Reliability
If adhesive extends to the top surface of the filter chip to ensure cavity formation, then reliability is improved, but material efficiency decreases
Solution Approach 1:
The adhesive extends to a portion of the side surface of the filter chip, specifically the region adjacent to the substrate where cavity formation is required, rather than covering the entire side surface or extending to the top surface. This localized application maintains cavity structure integrity in the necessary areas while minimizing adhesive material consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures the formation of a reliable cavity structure, enhances material efficiency, and improves the overall reliability of the RF front-end module by reducing the risk of cracking and unintended interconnections.
Implementation Method 1
a first adhesive part, at least partially mounted on the support structure and covering at least part of the side surface of the first filter chip
Data Source
AI summary
The present application belongs to the field of packaging technology, and particularly relates to a packaging structure for an RF front-end module. Through the interaction of the support structure and the first adhesive part arranged on the substrate, a cavity structure is formed between the first filter chip and the first surface of the substrate. Moreover, the first adhesive part does not require excessive area coverage, allowing for material savings. This design ensures the formation of a cavity between the filter chip and the substrate while maintaining cost efficiency, and it also improves the reliability of the packaging structure of an RF front-end module.