Double-Lined Faraday Cage Bag with Asymmetric Stitching
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Solution Overview
Problem
There is a need for a device that can easily and economically shield personal items such as cell phones, credit cards, and passports from unauthorized scanning and tracking using electromagnetic interference, particularly RF, infrared, and magnetic card decoders, to protect against identity theft and espionage.
Innovation Solution
A double-lined containment device with an outer and inner pocket formed from a fabric Faraday cage, where the stitching patterns of the inner and outer pockets are designed to avoid alignment, using a combination of folds and stitches to maintain shielding effectiveness, and a closure system with Velcro and additional hook and loop fasteners to prevent signal leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer containment device is used, then the device complexity is low, but the shielding effectiveness against electromagnetic interference is insufficient
Solution Approach 1:
The patent implements a nested double-lined structure where an inner pocket containing shielded items is placed within an outer pocket. Both layers are constructed with conductive fabric and stitching patterns that form interconnected Faraday cages. This nested configuration enhances shielding effectiveness by creating multiple barriers against electromagnetic interference, while the modular design allows each layer to be independently constructed and assembled.
Solution Approach 2:
The patent utilizes composite construction by combining conductive fabric material with metallic stitching threads to create the shielding layers. The conductive fabric provides the base shielding property, while the metallic stitching creates continuous conductive paths that reinforce the Faraday cage effect. This composite approach maximizes shielding effectiveness using materials that can be integrated into a flexible bag structure.
2Reliability
If stitching patterns are aligned between inner and outer pockets, then the manufacturing precision is improved, but the shielding effectiveness deteriorates due to signal leakage through aligned stitch holes
Solution Approach 1:
The patent deliberately employs asymmetric stitching patterns where the inner and outer pockets have different stitch hole positions and orientations. The inner pocket features a first pattern of stitches while the outer pocket has a second pattern that is intentionally misaligned and rotated relative to the first. This asymmetric arrangement prevents electromagnetic signals from passing through aligned holes in both layers, maintaining Faraday cage integrity while allowing independent optimization of each layer's stitching for manufacturing ease.
3Reliability
If a simple closure system is used, then the ease of operation is improved, but the shielding effectiveness deteriorates due to signal leakage at the opening
Solution Approach 1:
The patent implements a dynamic closure system using Velcro® brand hook and loop fasteners that allow the bag opening to be easily opened and closed by the user. When closed, the fasteners create a secure connection that maintains the shielding integrity by preventing signal leakage through the opening. The dynamic nature of this closure allows for convenient access while ensuring proper shielding when the bag is closed and zipped.
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 device effectively blocks electromagnetic interference, preventing unauthorized reading or tracking of personal information, ensuring that items inside remain secure and invisible to scanning technologies.
Implementation Method 1
The fabric which comprises a fabric Faraday cage
Data Source
AI summary
One embodiment of the present disclosure provides a shielding apparatus including a double-lined container having an outer pocket and an inner pocket mounted within the outer pocket. The inner and outer pockets each form an enclosure having a continuous closed edge interrupted by an opening. The continuous closed edge of the outer pocket is adjacent the continuous closed edge of the inner pocket, and the opening of the outer pocket is adjacent the opening of the inner pocket. The adjacent openings are interconnected and include a device for simultaneously opening and closing the interconnected adjacent openings. A first plurality of stitches and folds are included in the continuous closed edge of the inner pocket and a second plurality of stitches and folds are included in the continuous closed edge of the outer pocket.