Cable Tap Biasing Structure for Grounding and RF Shielding
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Solution Overview
Problem
Cable taps in coaxial cable television networks experience RF interference due to loss of contact between housing portions, leading to RF energy escape and interference with wireless communications when the RF gasket and environmental seal lose contact.
Innovation Solution
A cable tap with a biasing portion configured to maintain an electrical ground between loosely coupled housing portions, using a coil spring to ensure conductive contact and provide enhanced RF shielding, even when the housing portions are not tightly secured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the face plate and back box are securely fastened together, then RF shielding and environmental sealing are maintained, but the device requires more assembly steps and fastening components
Solution Approach 1:
The patent changes the mechanical state parameter of the housing portions from rigid fixed connection to flexible biased connection. The biasing portion maintains continuous contact between housing portions through elastic force, ensuring RF shielding effectiveness without requiring multiple fasteners or complex assembly structures.
Solution Approach 2:
The biasing portion automatically maintains electrical contact between housing portions through its inherent elastic recovery. The system self-regulates the contact pressure to ensure grounding and RF shielding without requiring external fastening mechanisms or additional assembly steps.
2Ease of operation
If fasteners are not tightened fully, then assembly is easier and faster, but RF gasket and environmental seal lose contact causing RF interference
Solution Approach 1:
The biasing portion is pre-configured with elastic elements that provide continuous contact pressure between housing portions. This beforehand cushioning ensures that even if fasteners are not tightly secured, the biasing portion maintains sufficient pressure on the RF gasket and environmental seal to prevent RF interference.
Solution Approach 2:
The patent introduces elastic deformation as a parameter change mechanism. The biasing portion utilizes elastic recovery to maintain contact pressure, allowing the system to tolerate variations in fastening torque while consistently preventing RF leakage.
3Productivity
If housing portions are loosely coupled, then device assembly is simpler and faster, but electrical contact is lost leading to grounding issues and RF leakage
Solution Approach 1:
The biasing portion ensures continuous electrical contact between housing portions through its elastic recovery mechanism. This continuous contact maintains grounding and RF shielding effectiveness throughout the device lifecycle, regardless of assembly tightness or operational vibrations.
Solution Approach 2:
The patent employs elastic elements within the biasing portion that function as flexible components. These elastic elements deform to maintain contact between housing portions, ensuring continuous electrical connection for grounding without requiring rigid fixed connections.
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
Prevents RF interference by maintaining electrical contact and grounding, ensuring effective RF shielding and reducing interference even in loose conditions.
Implementation Method 1
a biasing portion structurally configured to maintain an electrically conductive connection between the first housing portion and the second housing portion
Implementation Method 2
biasing portion structurally configured to maintain electrical contact between a first housing portion and a second housing portion to provide grounding
Data Source
AI summary
A cable tap structurally configured to maintain an electrical ground between loosely coupled housing portions to prevent or inhibit radio frequency interference. The cable tap may include a first housing portion structurally configured to connect to an input communication cable, a second housing portion structurally configured to connect an output communication cable, a signal processing portion structurally configured to receive and process a signal from the input communication cable and route a processed signal to the output communication cable; and a biasing portion structurally configured to maintain an electrically conductive connection between the first housing portion and the second housing portion when the first housing portion is loosely coupled with the second housing portion and the signal processing portion is receiving the signal from the input communication cable so as to ground the first housing portion to the second housing portion and provide enhanced RF shielding.