Tubular Dielectric Waveguide With Inner Coating for Low-Loss mm-Wave Links
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Solution Overview
Problem
Current dielectric waveguide cables face challenges in achieving low attenuation and dispersion for high-speed data transmission in the mm-wave range, particularly with increasing data rates, and require smaller diameters and tighter bending radii, which are compromised by high permittivity core materials and polymer material dispersion.
Innovation Solution
A dielectric waveguide cable design featuring a tubular core with a low-loss material surrounded by a cladding with lower permittivity and an inner high permittivity layer, optimized for field confinement using a bandgap structure, allowing for smaller dimensions and reduced attenuation and dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high permittivity core materials are used to achieve field confinement, then field confinement is improved, but attenuation increases due to high dissipation factors
Solution Approach 1:
The patent applies local quality by creating a bandgap structure with alternating high and low permittivity regions on the inner surface of the tubular core. This localized variation in permittivity creates a photonic bandgap that confines fields without requiring the entire core to have high permittivity, thus avoiding the attenuation penalty while achieving effective field confinement.
Solution Approach 2:
The patent uses composite materials by combining dielectric materials with different permittivity values to form a layered bandgap structure. This composite approach allows the waveguide to achieve both field confinement (through the high permittivity layers) and low attenuation (through the low permittivity layers), resolving the contradiction between these two requirements.
2Volume of moving object
If smaller cable diameters are implemented, then device compactness is improved, but bending radius requirements become tighter and more difficult to meet
Solution Approach 1:
The patent changes the permittivity parameter distribution within the cable structure by implementing a bandgap structure with alternating high and low permittivity layers. This parameter optimization allows the electromagnetic fields to be confined more effectively, enabling the cable to maintain performance with smaller diameters while achieving tighter bending radii that would otherwise be impossible with conventional uniform structures.
3Stability of the object's composition
If polymer materials with high permittivity are used, then field confinement is improved, but dispersion increases due to material dispersion
Solution Approach 1:
The patent applies local quality by confining the high permittivity materials to specific localized regions (the bandgap layers) rather than using them throughout the entire cable structure. This localized application provides field confinement where needed while minimizing the overall material dispersion, as the low permittivity regions dominate the propagation path and have lower dispersion characteristics.
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 design achieves low attenuation (<5 dB/m) and dispersion (group delay variation <4 pico sec/m) over a wide bandwidth, enabling smaller cable diameters and tighter bending radii, improving transmission efficiency and reducing material dependency on high dissipation factors.
Implementation Method 1
The inner wall (18) is coated by a high permittivity dielectric (3) having, compared to the tubular core (2), a higher permittivity
Implementation Method 2
A dielectric waveguide cable design featuring a tubular core with a low-loss material surrounded by a cladding with lower permittivity
Data Source
AI summary
A dielectric wave guide cable (1) includes a tubular core (2) made from a low loss material having a certain permittivity. The tubular core (2) is encompassed by a cladding (3) having, compared to the tubular core (2), a lower permittivity. The tubular core (2) may be coated on the inside by a coating (3) having a higher permittivity. The cladding (3) may be encompassed by a jacket (4).