Coaxial Connector Ingress Reduction Shield Waveguide
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Solution Overview
Problem
Conventional F-Type coaxial cable connectors fail to effectively reduce RF ingress when left open, leading to signal interference in cable television and satellite television systems, with existing solutions being 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 attenuating unwanted frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional connector shielding is used, then RF ingress is reduced to some extent, but the shielding effectiveness is insufficient and connectors remain vulnerable when left open
Solution Approach 1:
A waveguide barrier is introduced as an intermediary element between the external environment and the connector internals. This waveguide acts as a mediator that selectively blocks RF ingress while allowing the connector to remain open for normal operation. The waveguide creates an electromagnetic barrier without requiring physical enclosure of the connector.
Solution Approach 2:
The electrical parameters of the connector environment are changed by introducing the waveguide barrier, which modifies the electromagnetic field distribution. The waveguide changes the effective impedance and shielding characteristics of the open connector, transforming it from a vulnerable state to a protected state while maintaining operational functionality.
2Object-affected harmful factors
If multi-braid coaxial cables are used, then RF ingress is reduced, but cable flexibility and installation ease are compromised
Solution Approach 1:
The RF protection function is extracted from the cable structure itself and relocated to the connector interface. Instead of relying on the cable's multi-braid construction, the waveguide barrier is placed at the connector to provide shielding, allowing the cable to maintain its standard flexible single-braid construction for easy installation.
Solution Approach 2:
The waveguide barrier serves as an intermediary shielding element at the connector interface, separating the cable from the connector internals. This intermediary provides the necessary RF protection without requiring changes to the cable construction, thereby preserving cable flexibility and installation ease.
3Object-affected harmful factors
If high pass filters are installed, then low frequency RF ingress is limited, but system complexity and cost increase
Solution Approach 1:
The filtering function is extracted from separate electronic filter components and integrated into the mechanical waveguide structure. The waveguide's geometry itself provides the frequency-selective blocking action, eliminating the need for additional electronic high pass filter components and reducing overall system complexity.
Solution Approach 2:
Electronic filtering components are replaced with a mechanical waveguide structure that provides equivalent or superior frequency-selective blocking. The waveguide's physical dimensions and geometry create the necessary electromagnetic filtering effect, substituting mechanical design for electronic filtering circuitry.
4Object-affected harmful factors
If connector aperture is reduced to block RF ingress, then shielding effectiveness improves, but signal transmission capability is degraded
Solution Approach 1:
The aperture is segmented into two functional zones: an outer region occupied by the waveguide barrier that blocks RF ingress, and an inner region that maintains the necessary opening for signal transmission. The waveguide creates an annular blocking structure that preserves the central transmission path, allowing signal passage while blocking harmful RF frequencies.
Solution Approach 2:
Different regions of the aperture are given different functional qualities. The waveguide occupies the outer aperture region to provide RF blocking, while the inner aperture region maintains open quality for signal transmission. This local differentiation allows simultaneous RF protection and signal passage without compromising either function.
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 approach significantly reduces RF ingress by 20-40 dB at frequencies below 100 MHz while maintaining a nominal 75 ohm impedance, effectively addressing the issue of signal interference in CATV and satellite TV systems without significant degradation of the connector's operational performance.
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 attenuating unwanted frequencies
Implementation Method 2
waveguides with specific geometries and materials, is used to restrict RF ingress into coaxial cable connectors... attenuating unwanted frequencies
Data Source
Figure 1~2
Figure 3A~3C
Figure 4~5
AI summary
The present invention relates to s coaxial connector having a technical feature of a shield against unwanted radio frequency transfer in coaxial cable installations. Effective shields include perforated structures such as screens, fabrics, perforated plates, and perforated disks. In effect, these shields are waveguides tending to attenuate and/or reject passage of certain frequencies. An embodiment of the invention provides a smaller entry hole of 2 to 3.5 mm with a nominal thickness of between 0.5 to 1.5 mm. This combination of hole size and thickness acts as a waveguide to restrict ingress of low frequencies, typically under 100Mhz by 20-40dB of that of an open-ended F port.