Shielding Box With Wave-Absorbing Layer for RF Signal Attenuation
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Solution Overview
Problem
Existing RF shielding technologies fail to completely isolate radio frequency signals, allowing electronic equipment to connect to WiFi hotspots or Bluetooth devices despite being placed in a shielding box.
Innovation Solution
A shielding box with a layered structure comprising a wave-absorbing layer, multiple metal layers of different materials, and a conductive fabric layer that attenuates RF signals by absorbing and refracting them, controlling the transmission and reception distances of RF signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple shielding box structure is used, then the device complexity is reduced, but the RF signal isolation effectiveness deteriorates
Solution Approach 1:
The shielding box is divided into multiple functional layers: a first shielding layer with conductive mesh pattern, a second shielding layer with solid metal coating, and a third shielding layer with conductive pattern. This segmentation allows each layer to contribute differently to RF signal blocking, achieving comprehensive shielding effectiveness while maintaining structural manageability
Solution Approach 2:
The patent employs composite shielding structure combining different materials and patterns: conductive mesh, solid metal coating, and conductive patterns on flexible substrates. This composite approach leverages the complementary strengths of each material type to achieve superior RF signal isolation that cannot be obtained with a single material
2Reliability
If multiple metal layers of different materials are used, then the RF signal attenuation effectiveness is improved, but the device complexity increases
Solution Approach 1:
The shielding box is divided into multiple functional layers: a first shielding layer with conductive mesh pattern, a second shielding layer with solid metal coating, and a third shielding layer with conductive pattern. This segmentation allows each layer to contribute differently to RF signal blocking, achieving comprehensive shielding effectiveness while maintaining structural manageability
Solution Approach 2:
Different regions of the shielding box employ different shielding mechanisms: the first layer uses conductive mesh for general shielding, the second layer uses solid metal coating for enhanced blocking, and the third layer uses conductive patterns for additional attenuation. Each layer's local structure is optimized for its specific shielding function
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
Effectively reduces the transmission and reception distances of RF signals, preventing connections to WiFi hotspots and Bluetooth devices while allowing controlled signal propagation, demonstrated by specific distance reductions.
Implementation Method 1
the wave-absorbing layer 10 can absorb and refract the RF signal to reduce a transmission distance of the RF signal
Implementation Method 2
the wave-absorbing layer 10 can absorb and refract the RF signal to reduce a transmission distance of the RF signal
Implementation Method 3
the first metal layer 20, the conductive fabric layer 30, the second metal layer 40, and the third metal layer 50 can further attenuate the RF signal
Data Source
AI summary
A shielding box configured for regulating a transmission distance of a radio frequency (RF) signal of an electronic device is used as a container of the electronic device. The shielding box includes a box body. The box body includes a wave-absorbing layer, a first metal layer, a conductive fabric layer, a second metal layer, and a third metal layer in that order from inside to outside. An RF signal attenuation system and method are also provided.