Coaxial Connector Waveguide Shielding for RF Ingress Reduction
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Solution Overview
Problem
Existing coaxial cable connectors, particularly F-Type connectors, allow unwanted RF ingress when left open, leading to signal interference in CATV and satellite television systems, and current solutions are either expensive, impractical, or mechanically unreliable.
Innovation Solution
The implementation of electromagnetic radiation shields, such as waveguides with specific geometries and materials, is used to restrict RF ingress into coaxial cable connectors, even when they are open, by redistributing electric charges and blocking unwanted frequencies through appropriate aperture sizes and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional connector shielding is used, then RF ingress is reduced, but device complexity and cost increase
Solution Approach 1:
The patent extracts the RF shielding function from the traditional connector body and implements it through a separate waveguide structure with specific aperture dimensions. This allows the shielding function to be added without fundamentally redesigning the entire connector, reducing overall complexity while maintaining effectiveness.
Solution Approach 2:
The patent changes the physical parameters of the waveguide aperture (specific dimensions and geometry) to create frequency-selective shielding. By carefully controlling the aperture size and shape, the waveguide blocks RF ingress in the 5-100 MHz range while maintaining compatibility with standard connector interfaces.
2Object-affected harmful factors
If multi-braid coaxial cables are used, then RF ingress is reduced, but cost and manufacturing complexity increase
Solution Approach 1:
The patent introduces a waveguide structure as an intermediary component between the connector and the cable system. This waveguide acts as a passive RF filter that blocks ingress signals without requiring changes to the cable construction itself, simplifying the overall manufacturing process compared to multi-braid cable assemblies.
3Object-affected harmful factors
If high pass filters are used, then low frequency RF ingress is reduced, but device complexity and insertion loss increase
Solution Approach 1:
The patent converts the waveguide aperture into a frequency-selective structure that naturally attenuates low frequency RF signals while passing higher frequency cable television signals. The same physical structure that could potentially block signals is designed with specific dimensions that exploit waveguide propagation characteristics to block harmful frequencies below 100 MHz while maintaining signal integrity for operational frequencies.
4Ease of operation
If connector ends are left open, then ease of operation is improved, but RF ingress increases
Solution Approach 1:
The patent implements preliminary RF shielding action by installing the waveguide structure in advance at the connector interface. This pre-installed waveguide provides continuous RF protection regardless of whether the connector is mated or open, eliminating the need for additional protective measures when connectors are left accessible.
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
This solution effectively reduces RF ingress by 20-40 dB, maintaining a good impedance match and preventing signal interference, while being more cost-effective and reliable than existing methods.
Implementation Method 1
electromagnetic radiation shields, such as waveguides with specific geometries and materials, is used to restrict RF ingress into coaxial cable connectors, even when they are open, by redistributing electric charges and blocking unwanted frequencies
Data Source
AI summary
A coaxial connector with an F female end shield is configured to restrict RF ingress.