Dielectric Waveguide Crosstalk Reduction Using Split Ring Resonators
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Solution Overview
Problem
High-speed data transmission over short distances using differential signaling is limited by noise and radiated emissions, while fiber optics, though capable of higher speeds, requires expensive and bulky optical transmitters and receivers.
Innovation Solution
A dielectric waveguide layer with a higher dielectric constant core and lower constant cladding, coupled with periodic resonators, to contain electromagnetic signals and mitigate cross-talk, enabling high-speed data transmission without the need for optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If differential signaling is used for short high speed buses, then noise and radiated emissions are reduced, but the effective transmission length is limited
Solution Approach 1:
The patent introduces dielectric waveguides as an intermediary transmission medium between differential signaling and fiber optics. The waveguides use total internal reflection at the core-cladding interface to confine and guide electromagnetic signals, enabling extended transmission distances while maintaining signal integrity and reducing noise interference characteristic of differential signaling.
Solution Approach 2:
The patent changes the transmission medium from traditional copper traces to dielectric waveguides with specific refractive index parameters. By selecting core materials with higher dielectric constants than the cladding (e.g., core: 2.0-4.0, cladding: 1.4-1.6), the system achieves better signal confinement and reduced electromagnetic interference, extending effective transmission length.
2Speed
If fiber optics is used for high speed data transmission, then transmission speed and distance are improved, but device cost and space requirements increase
Solution Approach 1:
The patent replaces expensive optical transmitters and receivers with simpler dielectric waveguide structures that can be integrated into existing PCB manufacturing processes. The waveguides use standard dielectric materials and can be fabricated using conventional semiconductor manufacturing techniques, significantly reducing component cost and system complexity while achieving comparable transmission performance.
Solution Approach 2:
The dielectric waveguide structure serves multiple functions: it guides electromagnetic signals over long distances, provides mechanical support, and can be integrated with standard electronic components. This multi-functionality eliminates the need for separate optical transmitters and receivers, reducing device complexity while maintaining high-speed transmission capabilities.
3Area of stationary object
If multiple dielectric waveguides are placed close together, then space efficiency is improved, but cross talk between waveguides increases
Solution Approach 1:
The patent applies local quality by creating a distinct cladding layer with lower dielectric constant surrounding each waveguide core. This local modification of the electromagnetic environment confines the evanescent fields within each waveguide, preventing interaction between adjacent waveguides and reducing cross talk while maintaining compact spacing.
Solution Approach 2:
The patent converts the potentially harmful evanescent field leakage into a beneficial confinement mechanism. By designing the cladding layer with specific dielectric properties, the evanescent fields that would normally cause cross talk are instead reflected back into the core through total internal reflection, reducing cross talk while enabling closer waveguide spacing.
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 effectively contains electromagnetic signals within the core, reducing noise and emissions, and allows for high-speed data transmission (up to 70 Gb/s) over longer distances without the use of expensive optical transmitters and receivers.
Implementation Method 1
a first dielectric core forming a first dielectric waveguide, a second dielectric core forming a second dielectric waveguide, and a cladding disposed between the first and second dielectric cores where a material of the first core has a higher dielectric constant than a material of the cladding
Implementation Method 2
a periodic resonator disposed in the cladding between the first and second dielectric cores, the periodic resonator including a plurality of resonating structures arranged in an array and where each of the plurality of resonating structures is configured to resonate at a common resonant frequency
Data Source
AI summary
Embodiments herein describe a high-speed communication channel in a PCB that includes a dielectric waveguide sandwiched between two ground layers. The dielectric waveguide includes a core and a cladding where the material of the core has a higher dielectric constant than the material of the cladding. Thus, electromagnetic signals propagating in the core are internally reflected at the interface between the core and cladding such that the electromagnetic signals are primary contained in the core.