Conductive Resin Tape Shielding for Wide-Band Signal Cables
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Solution Overview
Problem
Signal transmission cables with transversely wound external conductors experience rapid signal attenuation and restricted frequency bands due to periodically discontinuous conductivity and difficulties in controlling the thickness of shield conductive members formed by applying liquid synthetic rubber.
Innovation Solution
A signal transmission cable with a band-shaped resin tape external conductor having an elongation percentage of at least 30% and volume resistivity of no more than 4×10−4 Ω·cm, wound around the insulator without a non-conductive layer at overlap parts, to prevent periodic discontinuity in conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a band-shaped tape external conductor is transversely wound around the insulator, then the cable structure is simple and easy to manufacture, but the conductivity becomes periodically discontinuous causing signal attenuation
Solution Approach 1:
The patent ensures continuous conductivity of the external conductor by making the resin tape itself conductive (volume resistivity ≤ 4×10^-4 Ω·cm) and by ensuring the overlap portions of the wound tape maintain conductive contact, eliminating the periodic discontinuity that would otherwise occur at the lap parts of the winding
2Stability of the object's composition
If liquid synthetic rubber is applied to form the shield conductive member, then flexibility is improved, but thickness control becomes difficult
Solution Approach 1:
The patent changes the physical state of the conductive material from liquid (synthetic rubber) to solid (resin tape), and adjusts the resin composition and tape thickness parameters to achieve both flexibility and precise thickness control in the external conductor
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 suppresses signal attenuation and maintains a wide frequency band by ensuring continuous conductivity and resistance to oxidation, enhancing the cable's signal transmission quality and manufacturing ease.
Implementation Method 1
an external conductor which is a band-shaped resin tape having characteristics of an elongation percentage of equal to or more than 30% and a volume resistivity of equal to or less than 4×10−4 Ω·cm
Data Source
AI summary
A signal transmission cable includes at least one internal conductor, an insulator, and an external conductor. The at least one internal conductor is formed in an elongated shape and is configured to transmit a signal. The insulator covers the internal conductor. The external conductor is a band-shaped resin tape having characteristics of an elongation percentage of equal to or more than 30% and a volume resistivity of equal to or less than 4×10−4 Ω·cm. The external conductor is configured to be wound around the insulator.