Coaxial Connector Non-Circular Shielding for RF Ingress
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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 use of electromagnetic radiation shields, such as waveguides with specific geometries and materials, is implemented to restrict RF ingress by redistributing electric charges and blocking unwanted frequencies, even when the connector end is left open.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional connector shielding is used, then RF ingress reduction is achieved, but device complexity and cost increase
Solution Approach 1:
The patent changes the geometric parameters of the connector body itself, specifically creating a non-circular cross-section (such as square, rectangular, or oval) to inherently reduce RF ingress. This approach modifies the physical dimensions and shape parameters of the connector to achieve shielding effectiveness without adding complex external shielding structures, thereby resolving the contradiction between RF ingress reduction and device complexity
Solution Approach 2:
The patent extracts the shielding function from separate external shielding components and integrates it directly into the connector body structure. By making the connector body itself non-circular, the shielding capability is built-in rather than added as a separate component, reducing overall device complexity while maintaining RF ingress reduction
2Object-affected harmful factors
If multi-braid coaxial cables are used, then RF ingress reduction is achieved, but cost and manufacturing complexity increase
Solution Approach 1:
The patent applies preliminary anti-action by designing the connector body geometry to preemptively block RF ingress before it can enter the cable system. The non-circular cross-section creates inherent shielding that prevents RF signals from coupling into the connector, eliminating the need for complex multi-braid cable assemblies and simplifying the overall manufacturing process
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 harmful effect of non-circular geometry (which can cause impedance variations) into a beneficial shielding mechanism. The same geometric features that could potentially disrupt signal flow are configured to create effective RF ingress barriers, particularly at low frequencies, while maintaining acceptable impedance matching and minimizing insertion loss through proper design
4Ease of operation
If connector ends are left open for ease of operation, then ease of operation is improved, but RF ingress increases
Solution Approach 1:
The patent makes the connector self-protecting by designing the non-circular body structure to inherently provide RF ingress reduction even when the connector end is left open. The geometric configuration itself serves the dual function of mechanical connection and RF shielding, eliminating the need for additional protective components while maintaining ease of operation
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 solution effectively reduces RF ingress by 20-40 dB, maintaining a nominal connector impedance of 75 ohms and preventing low-frequency signal interference, thus improving signal quality and reducing noise in CATV distribution systems.
Implementation Method 1
The use of electromagnetic radiation shields, such as waveguides with specific geometries and materials, is implemented to restrict RF ingress 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.