RF Shutter Discontinuous Mesh Plasma Protection
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Solution Overview
Problem
Existing electronic device protection methods, such as silicon carbide-based limiters and switchable transistorized mesh systems, are costly, complex, and introduce delays in responding to high-power microwave attacks, making them ineffective for phased array antenna systems and communication systems.
Innovation Solution
A low-loss, wide-bandwidth RF shutter with a discontinuous mesh of conductive members separated by microgaps, where a plasma forms to bridge the gaps in response to high-power or high-frequency signals, acting as a continuous mesh to reflect these signals while allowing low-power, low-frequency signals to pass through.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon carbide-based limiters are placed at each element of phased array antenna, then protection against high-power signals is improved, but cost and device complexity increase significantly
Solution Approach 1:
The antenna array is divided into multiple elements, and the protection system is segmented accordingly with each element having its own limiter. This allows independent protection of each element while maintaining overall system functionality. The segmentation enables the protection mechanism to be applied locally rather than requiring a centralized complex system.
Solution Approach 2:
The limiter at each antenna element is designed to automatically respond to high-power signals without requiring external control or complex coordination systems. Each limiter independently detects and responds to harmful signals, providing self-service protection that reduces overall system complexity while maintaining reliability.
2Reliability
If switchable transistorized mesh system is placed in front of antenna array, then protection against high-power microwave radiation is improved, but switching time delay increases and complexity is added
Solution Approach 1:
The protection system uses periodic monitoring of signal power levels at each antenna element. When high-power radiation is detected, the limiter is activated; when normal levels are detected, it deactivates. This periodic action enables rapid response without complex switching mechanisms, reducing time delay while maintaining protection reliability.
Solution Approach 2:
The patent replaces mechanical or electronic switching systems with a passive nonlinear limiting mechanism that automatically responds to signal power levels. This substitution eliminates complex switching circuits and reduces switching time delay while providing equivalent or superior protection against high-power microwave radiation.
3Productivity
If discontinuous mesh with microgaps is used for RF shutter, then bandwidth and speed are improved, but electrical continuity is reduced
Solution Approach 1:
The patent changes the electrical parameters of the mesh by introducing microgaps that alter the frequency-dependent behavior of the structure. At low frequencies, the mesh appears continuous; at high frequencies, the gaps create discontinuity that enables reflection. This parameter change allows the same structure to provide both continuity for normal operation and discontinuity for protection, improving bandwidth and switching speed.
Solution Approach 2:
The RF shutter combines conductive mesh material with dielectric or plasma-filled microgaps to create a composite structure. This composite design allows the mesh to maintain electrical continuity at operating frequencies while creating high-frequency reflection through the gap regions, thereby achieving both productivity improvement and reliability maintenance.
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 RF shutter provides effective protection against high-power and high-frequency signals with minimal complexity and delay, maintaining normal operation during low-power signal transmission and reception, and switching states in under 2 nanoseconds.
Implementation Method 1
A cavity including a gas is defined at each gap. The gas forms a plasma that electrically bridges the gaps to form an electrically continuous mesh in response to electromagnetic radiation.
Implementation Method 2
The plasma forms to bridge the gaps in response to high-power or high-frequency signals, acting as a continuous mesh to reflect these signals
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
Apparatus, systems and methods for electronic device protection are provided. A particular apparatus includes a non-conductive substrate and a plurality of cells including conductive members coupled to the non-conductive substrate. The conductive members are arranged to form a first discontinuous mesh, where each conductive member of a cell is separated from conductive members of adjacent cells by a gap and a cavity is defined in the non-conductive substrate at a location of each gap.