Ferromagnetic Absorbing Layer for PCB Component Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of unwanted crosstalk and electromagnetic interference (EMI) between components in densely packed printed circuit boards, particularly at radio frequencies, is exacerbated by the limitations of conventional shielding methods which are costly and space-intensive.
Innovation Solution
The use of a thin ferromagnetic absorbing layer or wall, integrated during packaging, to isolate components, which can be used alone or in conjunction with a conductive shield, reducing electromagnetic interference and crosstalk without increasing component spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional conductive shields are used to isolate components, then electromagnetic interference is reduced, but device complexity and cost increase
Solution Approach 1:
The patent changes the material parameter from conventional conductive shielding material to ferromagnetic absorbing material. This material substitution fundamentally alters the isolation mechanism from reflection-based (conductive) to absorption-based (ferromagnetic), reducing the need for complex shield structures while maintaining EMI protection effectiveness.
Solution Approach 2:
The patent extracts only the essential isolation function from complex conventional shields. By using ferromagnetic absorbing layers, the solution removes unnecessary shield structures, wire-bonds, and complex grounding systems, retaining only the critical EMI absorption capability needed for component isolation.
2Object-affected harmful factors
If conventional conductive shields are used to isolate components, then electromagnetic interference is reduced, but manufacturing cost increases
Solution Approach 1:
The patent changes the material parameter from expensive conventional conductive shielding material to cost-effective ferromagnetic absorbing material. This substitution reduces material costs while simplifying the manufacturing process by eliminating complex shield assembly operations and wire-bonding requirements.
Solution Approach 2:
The patent extracts only the essential isolation function from complex conventional shields. By using ferromagnetic absorbing layers, the solution removes unnecessary shield structures, wire-bonds, and complex grounding systems, retaining only the critical EMI absorption capability needed for component isolation.
3Area of stationary object
If components are placed closer together to increase density, then device compactness is improved, but crosstalk and electromagnetic interference increase
Solution Approach 1:
The patent introduces ferromagnetic absorbing layers as intermediary elements between closely spaced components. These layers act as mediators that absorb electromagnetic energy and prevent crosstalk, enabling components to be placed closer together without compromising signal integrity or increasing EMI.
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 approach allows for closer component placement without EMI, reducing the need for costly vertical shields and wire-bonds, while providing effective isolation and leakage current reduction.
Implementation Method 1
using a 'top' absorbing wall or layer that may be formed from ferromagnetic or other absorbing material
Implementation Method 2
formed from ferromagnetic or other absorbing material
Data Source
AI summary
Systems and methods for component isolation are disclosed. In one aspect, a “top” absorbing wall or layer may be formed from ferromagnetic or other absorbing material. This isolation wall may be positioned above components such as for example, filters (acoustic or otherwise), surface-mounted devices (SMDs), amplifiers (e.g., power amplifiers and low noise amplifiers), switches, or the like. The absorbing isolation layer may be introduced as part of an overmold package (or undermold (e.g., double-sided ball grid array (DSBGA)) and may be thinner than conventional Faraday cages or shields, allowing components to be placed in closer proximity without increasing crosstalk or electromagnetic interference (EMI). The absorbing wall may be used alone or in conjunction with a shield. Where a shield is used, the absorbing wall may help improve isolation and reduce leakage current that might otherwise appear on the shield.