RF Module Isolation via Recessed Resin and Post Electrodes
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Solution Overview
Problem
As radio-frequency modules are miniaturized, the distances between external connection terminals decrease, leading to deteriorated isolation characteristics, which affects the performance of mobile communication devices.
Innovation Solution
A radio-frequency module design featuring a module substrate with post electrodes spaced apart on one surface and covered by a resin member, where recesses are formed around the leading ends of the post electrodes to enhance isolation by creating spaces between them, reducing electromagnetic coupling and improving mechanical reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the radio-frequency module is reduced in size, then the module size is improved, but the isolation characteristics of external connection terminals deteriorate
Solution Approach 1:
The patent divides the resin member into multiple regions by forming recesses around specific post electrodes. This segmentation creates isolated zones that prevent electromagnetic coupling between adjacent terminals, allowing the module to maintain small size while preserving isolation characteristics through localized structural modifications.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the resin member. Specifically, recesses are formed around certain post electrodes (such as the first post electrode) to provide enhanced isolation, while other regions maintain the original solid resin structure. This local differentiation allows the module to achieve good isolation characteristics without compromising overall miniaturization.
2Area of stationary object
If post electrodes are spaced closer together, then the module area is reduced, but electromagnetic coupling between terminals increases
Solution Approach 1:
The recesses formed in the resin member act as intermediary structures between adjacent post electrodes. These recesses create physical and electromagnetic separation zones that reduce coupling effects, allowing the module to maintain compact area while minimizing harmful electromagnetic interactions between closely spaced terminals.
3Reliability
If recesses are formed around post electrodes, then isolation characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the physical parameters of the resin member by creating recesses with specific depth and width dimensions. By carefully controlling these parameters, the structure achieves improved isolation characteristics while maintaining compatibility with existing manufacturing processes, thus limiting the increase in manufacturing complexity.
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 configuration effectively improves the isolation characteristics of external connection terminals, suppressing interference and preventing short circuits, even in compact module designs, while maintaining mechanical strength and reliability.
Implementation Method 1
The plurality of post electrodes includes a first post electrode and a first recess recessed toward the second main surface and formed in at least part of a region of a surface of the resin member that surrounds a leading end part of the first post electrode... able to improve the isolation characteristics of external connection terminals
Data Source
AI summary
A module substrate has first and second main surfaces that on opposite sides of the module substrate, a resin member that covers the second main surface, and a plurality of post electrodes that are spaced apart from each other on the second main surface and penetrate through the resin member from the second main surface. The plurality of post electrodes includes a first post electrode and a first recess recessed toward the second main surface and formed in at least part of a region of the surface of the resin member that surrounds a leading end part of the first post electrode.