Conductive Concrete Power-Line Filter for EMP Attenuation
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Solution Overview
Problem
Existing electromagnetic (EM) protection methods for electronic devices, such as shielded enclosures and traditional filters, are costly and prone to degradation, failing to effectively attenuate high induced currents from EMP events and EM pulses, while TEMPEST filters require expensive multi-stage designs and surge protectors suffer from cumulative degradation.
Innovation Solution
A conductive concrete structure with embedded electrical cables, utilizing conductive carbon, magnetic, and metallic materials, providing a lossy transmission line that absorbs and attenuates EM waves, reducing high induced currents to safe levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-stage filter design is used, then TEMPEST filter performance is achieved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses conductive concrete as a composite material containing conductive aggregates (metallic particles, fibers, or mesh) embedded in a concrete matrix. This single composite material structure replaces complex multi-stage traditional filter designs, achieving TEMPEST filtering performance through the inherent electromagnetic shielding properties of the conductive concrete while significantly reducing device complexity
Solution Approach 2:
The conductive concrete structure serves multiple functions simultaneously: it provides structural support, electromagnetic shielding, and TEMPEST filtering in a single element. This multi-functionality eliminates the need for separate filter stages and components, reducing overall system complexity while maintaining reliable TEMPEST protection
2Reliability
If surge protectors are used, then protection against EMP events is provided, but cumulative degradation shortens life expectancy
Solution Approach 1:
The conductive concrete structure is designed as a durable, maintenance-free shielding solution that does not suffer from cumulative degradation like traditional surge protectors. The concrete matrix protects the conductive aggregates, allowing the structure to withstand repeated EMP events without performance degradation, effectively providing indefinite service life
Solution Approach 2:
The patent changes the fundamental parameter of protection mechanism from active surge suppression (which degrades) to passive electromagnetic shielding through conductive concrete. This parameter change transforms the protection system from one that degrades with use to one that maintains consistent shielding effectiveness throughout its service life
3Reliability
If shielded enclosures with traditional filters are used, then HEMP protection is achieved, but cost increases significantly
Solution Approach 1:
The conductive concrete serves as both the shielding enclosure material and the filtering medium simultaneously. By embedding conductive aggregates in the concrete matrix, the structure provides inherent HEMP protection and TEMPEST filtering without requiring additional expensive filter components, significantly reducing overall system cost
Solution Approach 2:
The patent merges the functions of shielded enclosure construction and electromagnetic filtering into a single integrated conductive concrete structure. This consolidation eliminates the need for separate shielded enclosure materials and traditional filter banks, reducing both material costs and installation complexity while maintaining effective HEMP protection
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 conductive concrete structure effectively attenuates EM pulses by up to 60 dB, protecting electronic devices from EMP events and TEMPEST threats, while being cost-effective and durable, without the need for expensive components or surge protectors.
Implementation Method 1
The conductive concrete structure effectively attenuates EM pulses by up to 60 dB, protecting electronic devices from EMP events and TEMPEST threats
Implementation Method 2
The radiated EM field can also induce high energy pulses coupled onto power lines and signal cables with peak currents as high as 2.5 kA over 500 ns FWHM
Implementation Method 3
The conductive concrete structure is characterized by an electrical conductivity greater than 0.5 siemens per meter, providing a lossy transmission line that absorbs and attenuates EM waves
Data Source
AI summary
An electrical filter is disclosed. The electrical filter can include a conductive concrete structure including at least one of a conductive carbon material, a magnetic material, or a conductive metallic material. The conductive concrete structure is characterized by an electrical conductivity greater than 0.5 siemens per meter. The electrical filter also includes at least one electrical cable disposed within the conductive concrete structure. The at least one electrical cable includes an input to receive an electrical signal and an output to output an attenuated electrical signal.