Differential Transmission Cable Module Using Single Core Coaxial Design
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Solution Overview
Problem
Existing differential signal transmission cables face challenges in reducing their outer diameter while maintaining transmission rate and distance, as decreasing the outer diameter increases electrical resistance or disrupts characteristic impedance, leading to decreased signal transmission.
Innovation Solution
A differential transmission cable module using a single core coaxial cable with one inner conductor and one outer conductor, where the outer conductor serves as both a return and ground, along with signal converters to facilitate differential signal transmission between electronic devices, allowing for a smaller outer diameter without compromising transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the outer diameter of the differential signal transmission cable is reduced, then the cable size is smaller, but the electrical resistance increases and characteristic impedance is disrupted, causing decreased transmission rate and distance
Solution Approach 1:
The patent combines the return conductor and ground conductor functions into a single outer conductor, reducing the cable structure from multiple conductors to a two-conductor system (inner signal conductor and outer conductor). This merging eliminates the need for separate ground conductors while maintaining electromagnetic shielding and reference potential, thereby reducing cable diameter without compromising transmission performance.
Solution Approach 2:
The outer conductor serves multiple functions simultaneously: it acts as the return path for differential current, provides electromagnetic shielding, and serves as the ground reference. This multi-functionality allows the cable to maintain reliable transmission characteristics with fewer conductors, enabling reduced outer diameter while preserving transmission rate and distance.
2Reliability
If three or more conductors are used for differential signal transmission, then noise cancellation and characteristic impedance control are achieved, but the cable structure becomes complex and larger
Solution Approach 1:
The patent merges the ground conductor function into the outer conductor structure, eliminating the need for separate ground conductors. The outer conductor is configured to provide both the return path and ground reference, reducing the cable from a three-conductor system to a two-conductor system while maintaining noise cancellation capabilities through differential signaling and impedance control.
Solution Approach 2:
The outer conductor is designed to perform multiple functions: serving as the return conductor for differential current, providing electromagnetic shielding against external interference, and establishing the ground reference potential. This multi-functional design simplifies the cable structure while maintaining noise resistance and impedance stability required for reliable transmission.
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 enables a smaller cable diameter without reducing the transmission rate or distance of differential signals, offering improved noise resistance and stability in high-frequency transmission.
Implementation Method 1
a differential transmission cable module used for transmitting a differential signal between electronic devices
Implementation Method 2
a dielectric covering an outer circumferential surface of the inner conductor
Data Source
AI summary
A differential transmission cable module used for transmitting a differential signal between electronic devices. The module includes a cable including one inner conductor, a dielectric covering the inner conductor, and an outer conductor covering the dielectric, a sending-end substrate provided at one end of the cable, and a receiving-end substrate provided at an other end of the cable. The sending-end substrate includes two sending-end signal conductors, a sending-end ground conductor, and a sending-end signal converter for converting a differential signal transmitted through the sending-end conductors into a differential signal transmitted through the inner and outer conductors. The receiving-end substrate includes two receiving-end signal conductors, a receiving-end ground conductor, and a receiving-end signal converter for converting the differential signal transmitted through the inner and outer conductors into a differential signal transmitted through the receiving-end conductors. The cable transmits a differential signal by the inner and outer conductors.