Dielectric Waveguide PTFE Permittivity Attenuation
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Solution Overview
Problem
Dielectric waveguides for millimeter and submillimeter waves face high attenuation due to the use of metallic core wires, which limits their transmission efficiency, and existing polytetrafluoroethylene (PTFE) materials have not effectively balanced high permittivity with low loss tangent for improved signal confinement.
Innovation Solution
A dielectric waveguide is developed using a PTFE molded article with a permittivity of 2.05 or higher and a loss tangent of 1.20 × 10^-4 or lower, combined with a dielectric layer of lower permittivity, creating a significant permittivity difference to enhance electromagnetic wave confinement and transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic core wire is used in dielectric waveguide, then the waveguide can transmit microwaves, but attenuation becomes too high for millimeter waves and submillimeter waves
Solution Approach 1:
The invention extracts and removes the metallic core wire from the waveguide structure, replacing it entirely with dielectric materials. This elimination of metal components directly addresses the high attenuation problem for millimeter and submillimeter waves while maintaining transmission capability through dielectric waveguide modes.
Solution Approach 2:
The invention substitutes the metallic conduction mechanism with a dielectric waveguide mechanism. Instead of relying on metal surfaces to guide electromagnetic waves, the system uses dielectric materials with specific permittivity characteristics to confine and guide the waves, thereby reducing attenuation at higher frequencies.
2Loss of energy
If polytetrafluoroethylene is used as insulating coating layer material, then dielectric loss is reduced, but balancing electric characteristics with processability requires controlled heating treatment
Solution Approach 1:
The invention changes the heating treatment parameters of polytetrafluoroethylene to achieve optimal balance between electric characteristics and processability. By controlling the heating temperature and duration, the patent optimizes the crystallinity and physical properties of PTFE to simultaneously reduce dielectric loss and maintain manufacturability.
Solution Approach 2:
The invention uses polytetrafluoroethylene as a composite dielectric material in the waveguide structure, leveraging its low dielectric loss properties. The material is integrated into the dielectric waveguide design to minimize energy attenuation while maintaining structural integrity and processability through controlled thermal treatment.
3Reliability
If permittivity difference between center portion and outer layer is increased, then electromagnetic wave confinement effect is enhanced, but obtaining polytetrafluoroethylene material with both high permittivity and low loss tangent becomes difficult
Solution Approach 1:
The invention applies local quality by creating a dielectric waveguide structure with spatially varying permittivity characteristics. The center portion and outer layer use different dielectric materials or configurations to achieve the desired permittivity difference for effective wave confinement, while each region is optimized to maintain low loss tangent properties.
Solution Approach 2:
The invention employs composite dielectric materials to achieve both high permittivity and low loss tangent simultaneously. By combining materials with complementary properties or using graded composite structures, the patent overcomes the difficulty of finding single materials that satisfy both high signal confinement and low energy loss requirements.
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 achieves high transmission efficiency for millimeter and submillimeter waves by increasing the permittivity difference between the center and outer layers, reducing attenuation, and maintaining low loss tangent, thereby improving the overall performance of dielectric waveguides.
Implementation Method 1
a polytetrafluoroethylene molded article that has a permittivity of 2.05 or higher at 2.45 GHz or 12 GHz, a loss tangent of 1.20 × 10^-4 or lower
Implementation Method 2
a loss tangent of 1.20 × 10^-4 or lower
Data Source
Figure 1~3
Figure 4
AI summary
The present invention provides a dielectric waveguide having excellent transmission efficiency. The dielectric waveguide includes a polytetrafluoroethylene molded article that has a permittivity of 2.05 or higher at 2.45 GHz or 12 GHz, a loss tangent of 1.20 × 10-4 or lower at 2.45 GHz or 12 GHz, and a hardness of 95 or higher.