Coaxial Cable Assembly With Axial Locking for EMI-Resistant Data Links
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Solution Overview
Problem
Current data transmission technologies in automotive environments face challenges with electromagnetic interference, mechanical shocks, and vibrations, particularly at lower frequencies, limiting the reliability and efficiency of coaxial cables and twisted pair transmission lines.
Innovation Solution
A coaxial connector and cable assembly utilizing frequency modulation schemes like QPSK, CDMA, or OFDM, combined with a thin solid metal outer conductor and a circumferential attachment mechanism for improved shielding, allows for high-speed digital data transmission beyond 20 GBit/s with reduced electromagnetic interference and mechanical strain relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielded parallel pair or twisted pair cables are used to reduce common mode interference, then electromagnetic interference resistance is improved, but at higher frequencies the shield holes allow electromagnetic waves to ingress and signal to interference ratio deteriorates rapidly
Solution Approach 1:
The patent changes the operating frequency parameter from traditional low frequencies to frequencies above 2 GHz, where the skin effect provides natural shielding and the attenuation characteristics of coaxial cables become favorable, resolving the contradiction between shield effectiveness and signal integrity
Solution Approach 2:
The patent employs a composite coaxial cable structure with specific dielectric and conductor materials optimized for high-frequency operation, combining the benefits of shielding with minimal signal loss and interference ingress
2Object-affected harmful factors
If the outer conductor thickness is increased to reduce electromagnetic interference, then shielding effectiveness is improved, but cable weight and stiffness increase
Solution Approach 1:
The patent changes the operating frequency parameter to above 2 GHz, where the skin effect confines current to the surface of the conductor, allowing thin outer conductors to provide adequate shielding while maintaining cable flexibility and reducing weight
Solution Approach 2:
The patent replaces mechanical shielding (thick outer conductors) with electromagnetic shielding mechanisms (skin effect at high frequencies), achieving interference protection without increasing cable mass or stiffness
3Productivity
If data transmission rate is increased by increasing the number of polarity changes, then data throughput is improved, but operating frequency increases and susceptibility to interference worsens
Solution Approach 1:
The patent changes the modulation scheme parameter to use more complex modulation formats (QPSK, 16-QAM, 64-QAM, 256-QAM) that encode multiple bits per symbol, allowing high data rates without proportionally increasing the symbol rate and operating frequency
Solution Approach 2:
The patent transitions from amplitude-based modulation to complex quadrature amplitude modulation that utilizes both amplitude and phase dimensions, effectively doubling the information capacity per symbol and achieving high throughput without increasing frequency
4Productivity
If frequency modulation schemes like QPSK, CDMA, or OFDM are used for high-speed data transmission, then data transmission rate is improved beyond 20 GBit/s, but complexity of the transmission system increases
Solution Approach 1:
The patent introduces a dedicated modem device as an intermediary component that handles the complex frequency modulation and demodulation operations, isolating the complexity from the main transmission system and enabling high-speed communication through modular architecture
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 reliable, cost-efficient, high-immunity data transmission up to 30 GBit/s with reduced weight and cost, while maintaining flexibility and minimizing electromagnetic leakage, effectively addressing the limitations of existing technologies in harsh automotive environments.
Implementation Method 1
a first electrical signal associated with the digital data is converted into a data electrical signal and transmitted via a coaxial cable to a second location
Implementation Method 2
at least one repeater station is positioned along the coaxial cable restoring digital signals from the data electrical signals at the repeater station
Implementation Method 3
utilizing frequency modulation schemes like QPSK, CDMA, or OFDM, combined with a thin solid metal outer conductor
Data Source
AI summary
A coaxial connector and a coaxial cable forming a cable assembly. The coaxial connector includes a cable entry side for entry of the coaxial cable and an opposite coupling side for coupling with the coaxial counter connector along the connector axis. The coaxial connector includes an inner contact element electrically connected with an inner conductor of the coaxial cable; an outer contact element electrically connected with an outer conductor of the coaxial cable; a dielectric connector element radially arranged between the inner contact element and the outer contact element; a connector housing arranged around the outer contact element; wherein the inner contact element is axially locked against the dielectric connector element and the dielectric connector element is axially locked against the connector housing such that the coaxial cable is strain relieved in an axial direction with respect to the connector housing.