Capacitive Network Signal Coupling Circuit for High-Frequency Ethernet
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Solution Overview
Problem
Conventional network connectors have low fabrication efficiency, high costs, and unstable signal strength due to labor-intensive coil winding, leading to increased signal attenuation at higher frequencies, which limits network transmission speed and stability.
Innovation Solution
A network signal coupling circuit with coupling modules comprising capacitors and equivalent resistors in a π loop configuration, allowing for automatic assembly and impedance matching, enhancing signal coupling performance as frequency increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If transformer coils are used for signal coupling in network connectors, then signal isolation and coupling can be achieved, but signal attenuation increases at higher frequencies, limiting network transmission speed
Solution Approach 1:
The patent changes the fundamental parameter of the coupling component from inductive (transformer coils) to capacitive (coupling capacitors). Capacitive reactance decreases with increasing frequency (Xc = 1/(2πfC)), unlike inductive reactance which increases with frequency. This parameter change enables effective signal coupling at high frequencies (1 Gbps and above) while reducing signal attenuation, directly resolving the contradiction between transmission speed and signal loss.
2Ease of manufacture
If labor-intensive coil winding is used in conventional network connectors, then transformer and filter coils can be fabricated, but fabrication efficiency is low and production cost is high
Solution Approach 1:
The patent replaces the mechanical coil winding process with automated SMT (Surface Mount Technology) placement of capacitors and resistors. Instead of manually or semi-automatically winding wires into complex coil structures, the invention uses standard capacitive components that can be precisely and rapidly placed by automated pick-and-place machines, dramatically improving fabrication efficiency and enabling high-volume production.
Solution Approach 2:
The patent extracts the complex coil winding operation from the network connector fabrication process. By removing the transformer coil structure and replacing it with simple capacitor-resistor networks, the invention eliminates the labor-intensive winding step entirely, allowing for fully automated assembly and significantly reducing manufacturing complexity.
3Manufacturing precision
If labor-intensive coil winding is used in conventional network connectors, then transformer coils can be fabricated, but product quality stability is affected due to inability to accurately control coil winding tightness and number of turns
Solution Approach 1:
The patent replaces the mechanical coil winding process with automated SMT placement of standard capacitive components. This substitution eliminates variability in winding tightness and turn count, as capacitors are placed with precise positioning accuracy by automated equipment. The resulting product quality is highly stable and repeatable, directly addressing the quality consistency issues of manual coil fabrication.
4Adaptability or versatility
If transformer coils with predetermined inductance are used, then signal coupling from primary to secondary side can be achieved, but the working frequency bandwidth is limited to a relatively narrow range
Solution Approach 1:
The patent changes the frequency-dependent behavior of the coupling mechanism by using capacitors instead of inductors. Capacitive reactance decreases as frequency increases, providing better coupling performance at higher frequencies. This allows the network connector to reliably support a wide frequency bandwidth from low speeds (10 Mbps) to high speeds (10 Gbps and above), making the design adaptable to evolving network standards while maintaining reliable signal coupling across all frequencies.
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 improves signal coupling performance and reduces signal attenuation at higher frequencies, enabling faster and more stable network transmission speeds beyond 1 Gbps by leveraging the increasing strength of capacitors with frequency.
Implementation Method 1
uses coupling modules to enhance the signal coupling performance subject to the characteristic of capacitors that the strength increases when the frequency rises
Data Source
AI summary
A network signal coupling circuit installed in a circuit board and electrically coupled between a network-on-chip and a network connector is disclosed to include a coupling module installed each channel thereof, each coupling module including two capacitors respectively electrically connected in series to the two circuits of the respective channel, two sets of equivalent resistors respectively electrically connected in parallel to opposing ends of the capacitors, and two signal equivalent grounding terminals respectively electrically connected to the two sets of equivalent resistors; by means of the characteristic of the capacitors that the strength increases when the frequency rises, the signal coupling performance of the signal coupling circuit is relatively enhanced when the applied network frequency is increased.