Selective RF Module Shielding for Antenna Isolation
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Solution Overview
Problem
As more components are integrated into radio frequency modules, effectively shielding them from electromagnetic interference in a compact and efficient manner becomes challenging, particularly in ensuring that only the radio frequency components are shielded while allowing antennas to remain unshielded to prevent interference with signal transmission and reception.
Innovation Solution
A packaged radio frequency module design featuring a shielding structure with a shielding layer and wire bonds that surrounds the radio frequency component but leaves the antenna unshielded, using a method that involves forming a conductive layer over the module and selectively removing it using laser techniques or masking processes to create a shielding layer over the component while maintaining antenna exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding structure is formed around the radio frequency component, then electromagnetic interference protection is improved, but the complexity of shielding multiple integrated components efficiently deteriorates
Solution Approach 1:
The shielding structure is segmented into multiple functional parts: a cavity structure forming the main shielding enclosure, a via structure providing vertical shielding and grounding connections, and a pad structure creating localized shielding zones. This segmentation allows each component to be optimized independently for its specific shielding function, reducing overall complexity while maintaining effective electromagnetic interference protection across multiple integrated components.
2Productivity
If the antenna is left unshielded, then signal transmission and reception efficiency is improved, but the risk of electromagnetic interference from other components deteriorates
Solution Approach 1:
The shielding structure implements local quality by creating a cavity structure that selectively shields specific regions around the radio frequency component while leaving the antenna region unshielded. The via structure provides localized grounding at critical points, and the pad structure creates localized shielding zones. This allows the antenna to maintain full signal transmission and reception efficiency while the radio frequency component receives targeted electromagnetic interference protection where it is most needed.
3Volume of moving object
If more components are integrated into the module, then functionality and compactness are improved, but the difficulty of shielding components from each other deteriorates
Solution Approach 1:
The shielding structure employs a nested configuration where the pad structure is integrated within the via structure, which in turn is integrated within the cavity structure. The pad structure forms innermost shielding zones around critical component areas, the via structure provides intermediate vertical shielding and grounding connections, and the cavity structure creates the outermost enclosing shielding environment. This nested arrangement enables effective shielding of multiple integrated components within a compact footprint, as each nested layer addresses interference at different spatial scales and orientations.
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 provides effective RF isolation for the component while allowing the antenna to function without interference, enabling efficient signal transmission and reception while maintaining a compact module size.
Implementation Method 1
A shielding structure can be formed around a radio frequency component. The shielding structure can shield the radio frequency component from electromagnetic radiation that is external to the shielding structure.
Implementation Method 2
selectively removing it using laser techniques
Data Source
AI summary
Aspects of this disclosure relate to methods of selectively shielded radio frequency modules. A radio frequency module can be provided with a radio frequency component and an antenna. A shielding layer can be formed over a portion of the radio frequency module such that the radio frequency component is shielded by the shielding layer and the antenna is unshielded by the shielding layer.