Single Pair Ethernet Cable Impedance Control
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Solution Overview
Problem
Conventional Single Pair Ethernet cables experience high impedance at lower frequencies, leading to return losses and reduced output, and existing solutions do not effectively reduce impedance or operate within the 0.1-20 MHz frequency range.
Innovation Solution
A Single Pair Ethernet cable design featuring twisted pairs of conductors with a specific insulation and metal shielding, including a polyolefin insulation layer and a net-like structure for the second metal layer, optimized for a frequency ratio of 4.77-12.25 and impedance greater than or equal to 80Ω, allowing operation between 0.1 MHz and 20 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If Single Pair Ethernet cable operates at lower frequencies, then material usage is reduced and installation is simplified, but impedance increases causing return losses and reduced output
Solution Approach 1:
The patent applies parameter changes by optimizing the frequency ratio (f0/ft) to be between 4.77 and 12.25, where f0 is the first resonant frequency and ft is the twist frequency. This specific parameter range enables the cable to maintain low impedance and reduced return losses while operating at lower frequencies (0.1-20 MHz), thus preserving electrical performance while using less material
Solution Approach 2:
The patent introduces dynamic characteristics by carefully controlling the twisting geometry and resonant frequency relationships. The twist frequency and resonant frequencies are dynamically related through the frequency ratio parameter, allowing the cable to adapt its electrical characteristics to maintain optimal performance across the operating frequency range
2Reliability
If Single Pair Ethernet cable uses higher impedance to reduce return losses, then signal integrity improves, but output and transmission capability decrease
Solution Approach 1:
The patent changes the impedance parameter by controlling the frequency ratio and geometric parameters of the twisted pair. Instead of using high impedance, the patent optimizes the frequency ratio (4.77-12.25) and geometric parameters to achieve low impedance operation, thereby maintaining both signal integrity and high output capability simultaneously
3Reliability
If conventional Ethernet cables use 2 or 4 pairs of conductors for high data rate transmission, then transmission reliability improves, but cable weight and complexity increase
Solution Approach 1:
The patent extracts the essential transmission function from multi-pair cables by implementing Single Pair Ethernet. It takes out only the necessary single twisted pair configuration while maintaining transmission reliability through optimized frequency ratio and geometric parameters, thereby reducing cable weight and complexity while preserving core functionality
Solution Approach 2:
The patent changes the transmission parameters by operating at optimized frequency ratios (4.77-12.25) and controlling geometric parameters of the single twisted pair. This enables reliable data transmission over a single pair, eliminating the need for multiple pairs and consequently reducing cable weight
4Ease of operation
If Single Pair Ethernet cable is designed for lean and lightweight construction, then ease of installation improves, but impedance control and return loss mitigation become difficult
Solution Approach 1:
The patent applies parameter changes by defining specific ranges for frequency ratio (4.77-12.25) and geometric parameters that simultaneously achieve lightweight construction and precise impedance control. These optimized parameters enable easy installation with a lean design while maintaining reliable impedance characteristics and reduced return losses
Data Source
AI summary
The present disclosure relates to a cable (100) comprising at least one twisted pair of conductors (102) and a sheath (110) encapsulating the at least one twisted pair of conductors (102). In particular, the at least one twisted pair of conductors (102) has a pair lay length and a pair impedance. Moreover, the at least one twisted pair of conductors (102) has a frequency ratio between 4.77-12.25. Furthermore, the frequency ratio is ratio of the pair impedance to the pair lay length. Further, the cable (100) can operate between 0.1 MHz to 20 MHz. Additionally, the cable (100) is a Single-Pair Ethernet cable. The cable (100) further comprises an insulation layer (104) at least partially covering each conductor of the at least one twisted pair of conductors (102). Additionally, the length of the conductor is 105-115% of cable length.