Shielded High-Speed Communication Jack for Impedance Matching
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Solution Overview
Problem
Existing communication jacks, such as RJ45 jacks, are limited in their ability to maintain consistent signal quality at high frequencies due to unaddressed reactance issues, leading to signal degradation and failure, particularly in high-speed data transmission applications.
Innovation Solution
A high-speed communication jack design featuring a flexible circuit board with matched traces and capacitors, along with a shielding case, to create a balanced, radio frequency-tuned circuit that adjusts impedance and filters common mode noise, preventing signal reflections and enhancing data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RJ45 jack design is used, then ease of manufacture and standardization are maintained, but signal quality degrades at high frequencies due to unaddressed reactance issues
Solution Approach 1:
The patent changes the electrical parameters of the jack by introducing capacitors connected to each contact element and ground element, and by creating balanced radio frequency-tuned circuits. This transforms the jack from a simple connector into an impedance-matched, frequency-tuned device that maintains signal integrity at high frequencies up to 40 GHz and beyond.
Solution Approach 2:
The patent introduces capacitors as intermediary components between the contact elements and ground elements. These capacitors act as mediators that tune the electrical characteristics of the jack, creating balanced radio frequency circuits that cancel out inductive reactance and maintain consistent impedance across high frequency ranges.
2Productivity
If high frequency transmission is implemented, then data throughput increases, but signal reflections and interference increase due to impedance mismatch
Solution Approach 1:
The patent changes the impedance parameters of the jack by incorporating capacitors that create radio frequency-tuned circuits. This transforms the electrical characteristics of the jack to achieve impedance matching with high frequency cables, thereby minimizing signal reflections and allowing data throughput to reach 40 gigabits and beyond without degradation.
Solution Approach 2:
The patent converts the harmful inductive reactance that naturally occurs in jack contacts into a beneficial effect by adding capacitors that create resonant circuits. At the tuned radio frequency, the capacitive reactance cancels the inductive reactance, transforming the potential source of signal degradation into a mechanism that enhances signal transmission at high frequencies.
3Object-affected harmful factors
If shielding is added to reduce noise, then signal interference decreases, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the shielding function with the existing jack structure by integrating capacitors and ground elements into the contact assembly. Rather than adding separate shielding components, the design combines noise reduction functionality with the essential electrical contacts, maintaining ease of manufacture while achieving superior noise rejection for high frequency signals.
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 transmission of high-speed data signals up to 40 gigabits and beyond by minimizing signal interference and maintaining consistent impedance, thus overcoming the limitations of traditional jacks in high-frequency applications.
Implementation Method 1
a capacitor may be formed in each via by a trace layer and a return signal layer embedded in a dielectric layer
Implementation Method 2
a shielding case surrounding the housing, and a flexible circuit board between the shielding case and the housing
Data Source
AI summary
A circuit board for a high speed communication jack including a rigid circuit board in the housing having a substrate, a plurality of vias extending through the substrate with each via being configured to accommodate a pin on the housing, a plurality of traces on a middle layer in the substrate, with each trace extending from a corresponding one of the plurality of vias, a first shielding layer on a first side of the middle layer in the substrate, a second shielding layer on a second side of the middle layer in the substrate, and a third shielding layer adjacent to the second shielding layer.