Cable Entry Arrangement for Shielded Satellite Terminals
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Solution Overview
Problem
Existing cable entry solutions for electromagnetically shielded containers are often bulky and heavy, limiting the compactness of mobile equipment such as satellite terminals, and may also lead to signal quality issues due to vibration-induced loosening of connectors.
Innovation Solution
A slim and compact cable entry arrangement that includes a base member with a channel for the cable and at least one sealing member, such as electrically conductive epoxy resin or an electrically conductive lid, to securely and shieldingly pass cables into an electromagnetically shielded container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional cable entry solutions are used, then electromagnetic shielding is maintained, but the device size and weight increase
Solution Approach 1:
The cable entry arrangement is segmented into distinct functional components: a base member with a channel, a sealing member for galvanic connection, and a cable guide structure. This segmentation allows each component to be optimized independently for compactness while maintaining the overall shielding integrity through precise alignment and connection of the segments.
Solution Approach 2:
The patent employs thin-walled base members and sealing members that provide sufficient electromagnetic shielding while minimizing volume. The cable channel is designed as a slender structure that guides the cable through the shielded container wall with minimal protrusion, reducing the overall device footprint while maintaining shielding effectiveness.
2Reliability
If connectors are used to pass cables through shielded containers, then signal transmission is enabled, but vibration causes loosening and signal quality degradation
Solution Approach 1:
The sealing member performs multiple functions simultaneously: it provides galvanic connection between the cable shielding and the container, seals the cable entry point to maintain shielding integrity, and mechanically secures the cable in place. This merging of functions eliminates the need for separate connectors that could loosen under vibration.
Solution Approach 2:
The patent replaces traditional mechanical connectors with a sealing member that uses galvanic connection and sealing mechanisms. This substitution eliminates moving parts and threaded connections that are susceptible to vibration-induced loosening, providing a more stable and reliable signal transmission path.
3Ease of operation
If cables are routed through container walls, then electrical connection is established, but shielding leakage occurs
Solution Approach 1:
The base member acts as an intermediary structure that facilitates cable routing through the shielded container wall while maintaining shielding integrity. It provides a dedicated channel that guides the cable through the wall with minimal disruption to the electromagnetic field, and the sealing member further mediates the connection between the cable shielding and the container.
Solution Approach 2:
The sealing member establishes an equipotential connection between the cable shielding and the shielded container by providing a galvanic path. This ensures that both surfaces are at the same electrical potential, eliminating voltage differences that could cause electromagnetic interference or shielding leakage.
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 allows for a more compact and portable design of electromagnetically shielded containers and satellite terminals while maintaining effective electromagnetic interference (EMI) and radio-frequency interference (RFI) shielding and ensuring reliable signal transmission.
Implementation Method 1
One way to protect electronic devices from EMI and RFI is to use the Faraday cage principle by implementing radio frequency (RF) shielding to safeguard devices and equipment from the harmful effects brought by RF interference. A Faraday cage is a continuous and conductive enclosure made of wire mesh or screens that blocks static and non-static electromagnetic fields.
Implementation Method 2
The at least one sealing member is adapted to retain the cable in the channel and galvanically connect a cable shielding of the cable to the wall of the electromagnetically shielded container
Data Source
Figure 1~3b
Figure 3c~4b
Figure 5~7
AI summary
A cable entry arrangement passes the conductors of a cable (200) into an electromagnetically shielded container (500). The cable entry arrangement receives the cable (200) with a symmetry axis thereof being parallel to a wall (510) of the container (500). The cable entry arrangement (100) includes a base member (115) and at least one sealing member (525). The base member (115) contains a channel (125) adapted to lead the cable (200) with its symmetry axis parallel to the wall (510) from an inlet end (126) of the base member (115) to a through-opening (515) in the wall (510). The at least one sealing member (525) retains the cable (200) in the channel (125) and galvanically connects a cable shielding (210) of the cable (200) to the wall (510).