Composite Substrate for Antenna Module with Magnetic Shielding
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Solution Overview
Problem
Conventional antenna modules in mobile devices face challenges with metal covers blocking wireless communication and near-field communication due to signal interference, and have complex preparation processes and high costs, especially when trying to integrate wireless charging, MST, and NFC functions.
Innovation Solution
A composite substrate is developed, comprising non-magnetic substrates with copper foils and a magnetic sheet made of magnetic powder and polymer resin, laminated in a roll-to-roll process to create a thin, cost-effective antenna module that integrates wireless charging, MST, and NFC functions without the need for a separate ferrite sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal cover is used to improve appearance and grip feeling, then aesthetic quality is improved, but wireless communication and near-field communication are blocked due to signal interference
Solution Approach 1:
The cover is divided into two distinct layers: an upper metal cover layer for aesthetic purposes and a lower magnetic sheet layer for electromagnetic shielding. This segmentation allows each layer to fulfill its specific function independently - the metal layer provides appearance quality while the magnetic sheet layer protects wireless communication signals from interference.
2Reliability
If conventional antenna modules with separate ferrite sheets are used to provide electromagnetic shielding, then shielding effectiveness is improved, but device thickness increases and preparation process becomes complicated
Solution Approach 1:
The magnetic sheet is integrated directly into the cover structure, merging the electromagnetic shielding function with the protective cover component. This eliminates the need for separate ferrite sheets and their associated mounting processes, thereby simplifying the overall preparation process while maintaining shielding effectiveness.
Solution Approach 2:
The cover is constructed as a composite structure combining metal material for aesthetic purposes with magnetic sheet material for electromagnetic shielding. This composite approach allows both functions - appearance quality and signal protection - to coexist within a single integrated component.
3Reliability
If conventional antenna modules with separate ferrite sheets are used to provide electromagnetic shielding, then shielding effectiveness is improved, but production cost increases
Solution Approach 1:
The magnetic sheet is merged into the cover structure itself, eliminating the need for separate ferrite sheet components and their associated procurement, handling, and assembly processes. This integration reduces the total bill of materials and simplifies production workflows, thereby lowering overall production costs while maintaining shielding effectiveness.
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
The solution reduces the thickness and production complexity of antenna modules, enabling slim device designs while providing effective electromagnetic shielding and multiple communication functions at a lower cost than conventional ferrite sheets.
Implementation Method 1
a magnetic sheet that is configured to be interposed between the first non-magnetic substrate and the second non-magnetic substrate
Implementation Method 2
the magnetic sheet and the first and second non-magnetic substrates, which are disposed on the upper and lower surfaces thereof, are integrated through a roll-to-roll process
Data Source
AI summary
The present disclosure provides a composite substrate for an antenna module, which includes: a first non-magnetic substrate that is configured to have a first copper foil; a second non-magnetic substrate that is configured to have a second copper foil; and a magnetic sheet that is configured to be interposed between the first non-magnetic substrate and the second non-magnetic substrate and that is configured to be integrally laminated with the non-magnetic substrates, and further provides a preparation method thereof. The present disclosure provides a simplification of a process, low costs, a slim design, and a grip-feeling of a metal material while providing functions of wireless charging, MST, and NFC.