NFC Antenna Shielding Structure for Thin Electronic Housings
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Solution Overview
Problem
Existing electronic devices face challenges in providing good contactless point-to-point data transmission while maintaining a thin overall thickness, particularly due to interference from motherboard components affecting near field communication antenna modules.
Innovation Solution
The electronic device incorporates a metal shielding cover with an accommodating groove for the near field communication antenna module, which is separated from the motherboard, and a shielding member with through holes to allow signal transmission, while maintaining structural strength and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the near field communication antenna module is integrated with the motherboard, then the device structure is simplified, but the antenna performance is degraded due to interference from motherboard components
Solution Approach 1:
The patent introduces a shielding member as an intermediary component between the NFC antenna module and the motherboard. This shielding member with through holes allows the antenna signal to pass through while blocking interference from motherboard components, thus resolving the contradiction between structural integration and performance isolation
Solution Approach 2:
The patent segments the NFC antenna module from the motherboard by providing it with an independent accommodating groove and shielding structure. This segmentation allows the antenna to be physically separated and electrically isolated from interfering components while maintaining overall device integration
2Reliability
If a shielding structure is added to protect the NFC antenna from interference, then the antenna performance is improved, but the device thickness increases
Solution Approach 1:
The patent embeds the shielding member and accommodating groove structure within the existing device layers. The shielding member is positioned between the antenna module and motherboard, nesting the protective function within the existing device thickness rather than adding external layers
Solution Approach 2:
The shielding member is designed as a thin structure with through holes that provides effective electromagnetic shielding while maintaining minimal thickness. This thin film approach allows the shielding function to be integrated without significantly increasing the overall device thickness
3Strength
If the shielding member has a solid structure, then the structural strength is maintained, but the signal transmission is blocked
Solution Approach 1:
The shielding member is designed with a porous structure consisting of through holes that allow NFC signals to pass through while maintaining structural integrity. The patterned arrangement of holes provides both signal transmission pathways and structural support
4Length of moving object
If the NFC antenna module is placed closer to the surface, then the reading distance is improved, but the interference from motherboard components increases
Solution Approach 1:
The shielding member serves as an intermediary that enables the antenna to be positioned closer to the device surface for improved reading distance while simultaneously blocking interference from motherboard components located beneath the shielding structure
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 enhances the performance of the near field communication antenna module by shielding interference, improving radiation power and coverage, and allowing contactless data transmission without increasing the device's thickness, with reading distances exceeding 15 mm and meeting NFC Forum specifications.
Implementation Method 1
the metal shielding cover separates the motherboard and the near field communication antenna module, the metal shielding cover may effectively shield the influence of parts on the motherboard on the near field communication antenna module
Implementation Method 2
The through holes of the sensing area may allow a radiation signal of the near field communication antenna module to pass through, so as to perform contactless point-to-point data transmission
Data Source
AI summary
An electronic device includes a motherboard, a metal shielding cover, a near field communication (NFC) antenna module, and a shielding member. The metal shielding cover covers one side of the motherboard and includes a top surface away from the motherboard and an accommodating groove recessed in the top surface. The near field communication antenna module is disposed in the accommodating groove, and the near field communication antenna module is signal-connected to the motherboard. The shielding member is disposed on the top surface and includes a sensing area corresponding to the near field communication antenna module. The sensing area includes multiple through holes and a support structure located between the through holes.