Shielded Enclosure with Low-Pass Filter for EMI Protection
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Solution Overview
Problem
Portable storage devices are vulnerable to data loss due to exposure to high levels of electromagnetic interference (EMI) such as electromagnetic pulses (EMPs) or intentional electromagnetic interference (IEMI), which existing protective enclosures fail to adequately shield against, particularly through power inputs and communication lines.
Innovation Solution
An electromagnetically shielded enclosure with a low-pass filter is designed to prevent spurious or intentional conductive high-frequency electromagnetic energy from entering the interior volume, using a combination of shielded walls and filters to protect both portable storage devices and network-attached storage systems from radiative and conductive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing protective enclosures are used to protect portable storage devices, then physical damage protection is provided, but electromagnetic interference protection is insufficient
Solution Approach 1:
The patent implements nested electromagnetic shielding by placing a storage device inside an inner enclosure, which is itself contained within an outer enclosure. Both enclosures have electromagnetic shielding properties, creating multiple layers of protection. This nested structure allows the device to benefit from cumulative shielding effectiveness while maintaining portability and physical protection.
2Object-affected harmful factors
If electromagnetic shielding is enhanced to block high-frequency electromagnetic energy, then data protection against EMP and IEMI is improved, but signal transmission through communicative connections may be affected
Solution Approach 1:
The patent applies electromagnetic shielding selectively to specific areas rather than uniformly throughout the entire enclosure. The shielding materials and structures are concentrated at critical locations where electromagnetic interference is most likely to penetrate, such as seams, joints, and connection points. This localized approach maintains signal transmission quality while providing effective protection against radiative electromagnetic energy.
Solution Approach 2:
The patent introduces electromagnetic filters as intermediary components between the external environment and the shielded interior. These filters are positioned at communicative connections and power inputs to selectively block harmful high-frequency electromagnetic energy while allowing legitimate signal transmission. The filters act as mediators that distinguish between protective shielding requirements and operational signal needs.
3Object-affected harmful factors
If electromagnetic filters are added to block conductive high-frequency energy, then data protection against IEMI is improved, but device complexity increases
Solution Approach 1:
The patent designs electromagnetic filters that serve multiple functions simultaneously. The same filter components block conductive high-frequency electromagnetic energy from both power inputs and communicative connections, while also providing some degree of radiative shielding. This multi-functionality reduces the overall number of separate components needed, thereby limiting the increase in device complexity while maintaining comprehensive protection.
Data Source
AI summary
Electromagnetically shielded portable storage devices are disclosed. One such device includes an electromagnetically shielded enclosure having an interior volume, the electromagnetically shielded enclosure including a plurality of shielded walls and sized to be manually carried by a person. The interior volume of the enclosure is isolated from high-frequency electromagnetic energy generated external to the enclosure. The device includes at least one storage device positioned within the interior volume, and at least one communicative connection extending from the at least one storage device to a communicative socket accessible external to the electromagnetically shielded enclosure. The at least one communicative connection is configured to allow access to the storage device by a computing system external to the electromagnetically shielded enclosure. The device also includes an electrical filter positioned at least partially within the electromagnetically shielded enclosure, and including a low-pass filter selected to prevent spurious or intentional conductive high-frequency electromagnetic energy from entering the interior volume via the communicative connection.