RF Filter Assemblies With Integrated Cavity Frames
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Solution Overview
Problem
Existing shielded enclosures for secure communications face challenges in reducing signal and power leakage through access panels and fasteners, which can compromise security against eavesdropping, especially in unsecured locations.
Innovation Solution
The use of optimized frames with cavities and receptacles reduces the number of fasteners needed to connect filters and components, minimizing leakage by allowing for precise and efficient integration of electronic and electrical components, and utilizing CAD-based designs and CNC machining for complex shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple fasteners (screws and bolts) are used to fasten filters to the metal frame, then the filters are securely connected to the assembly, but signal leakage increases through the fastener openings
Solution Approach 1:
The patent merges the functions of multiple fasteners into a single integrated cavity structure. The cavity receives and secures the filter assembly while eliminating the need for multiple discrete fasteners, thereby maintaining connection strength while reducing leakage paths.
Solution Approach 2:
The patent extracts the fastening function from the traditional screw-and-flange system and relocates it into the cavity structure itself. The cavity is designed to receive and secure the filter assembly through integrated features rather than external fasteners, removing the source of leakage.
2Reliability
If a flange is added to physically connect the power filter to the assembly, then the connection is secured, but the number of fasteners and potential leakage points increases
Solution Approach 1:
The patent combines the flange and fastener functions into the cavity structure itself. The cavity includes integrated features that physically connect and secure the power filter to the assembly without requiring separate flanges or multiple fasteners, thereby maintaining reliability while reducing complexity.
3Ease of manufacture
If traditional machined metal frames with multiple fasteners are used, then components can be connected, but communication signals may leak through the small openings
Solution Approach 1:
The patent replaces the mechanical fastener system with an integrated cavity structure that uses geometric interlocking and friction fit mechanisms. This substitution eliminates the need for holes and openings required by traditional fasteners, thereby preventing signal leakage while maintaining ease of assembly.
Data Source
AI summary
Novel assemblies for use in conjunction with RF shielded enclosures and the like include one or more RF power and signal filters connectibly inserted, attached to, or otherwise made a part of optimized cavities or receptacles formed within an optimized frame of the assembly. The use of optimized cavities or receptacles greatly reduces the number of exterior fasteners needed to connect filters to the assembly or the assembly to an enclosure which, in turn, reduces leakage. The optimized cavities or receptacles may be arranged in a compact manner in order to make optimum use of the available space on an optimized frame of the assembly.