Shield Terminal Air Chamber Dielectric Impedance
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Solution Overview
Problem
Shield terminals with low impedance face challenges in maintaining mechanical rigidity, as materials with low dielectric constants like polypropylene are undesirable for holding inner conductors due to their low mechanical strength.
Innovation Solution
A shield terminal design featuring a dielectric made of synthetic resin with air chambers and a dual-component structure, where one component is polybutylene terephthalate for high mechanical strength and the other is polypropylene or similar materials with lower dielectric constants, enhancing impedance without compromising rigidity by strategically placing air chambers and retaining portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a material with low dielectric constant (e.g., polypropylene) is used to enhance impedance, then impedance is improved, but mechanical rigidity deteriorates
Solution Approach 1:
The dielectric is constructed as a composite structure combining a first component (providing mechanical strength) and a second component (providing low dielectric constant). This composite approach allows simultaneous achievement of high mechanical rigidity and low dielectric constant for enhanced impedance.
Solution Approach 2:
Air chambers are strategically formed in specific regions of the dielectric wall, particularly in areas corresponding to the inner conductor body, to locally reduce dielectric constant and enhance impedance where needed, while maintaining mechanical strength in other critical areas.
2Strength
If the dielectric is made of high rigidity material to hold inner conductor, then mechanical rigidity is improved, but impedance deteriorates
Solution Approach 1:
Air chambers are formed in specific regions of the dielectric wall to locally reduce the dielectric constant in areas where mechanical support is less critical, thereby enhancing impedance without compromising overall mechanical rigidity.
Solution Approach 2:
The dielectric uses a composite structure where the first component provides mechanical strength and the second component (with lower dielectric constant) is combined with air chambers to reduce overall dielectric constant and enhance impedance.
3Reliability
If air chambers are added to enhance impedance, then impedance is improved, but device complexity increases
Solution Approach 1:
The dielectric is divided into multiple components (first component and second component) with air chambers integrated into the wall structure. This segmentation allows strategic placement of air chambers to enhance impedance while maintaining a manageable structural complexity through modular design.
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
This configuration effectively enhances impedance across the terminal while maintaining mechanical rigidity, ensuring reliable communication performance in high-speed communication circuits.
Implementation Method 1
Air has a lower dielectric constant than synthetic resin. The air chamber is formed in the wall constituting the conductor accommodation chamber. This enables an impedance to be enhanced even if the dielectric is made of a material having high rigidity.
Data Source
AI summary
A shield terminal (12) includes a dielectric (22) made of synthetic resin and formed with conductor accommodation chambers (39) inside, inner conductors (15) accommodated in the conductor accommodation chambers (39), an outer conductor (14) for surrounding the dielectric (22), and wall portions (24, 35) constituting the conductor accommodation chambers (39) and formed with air chambers (42, 43, 45 and 46). Focusing on the fact that air has a lower dielectric constant than synthetic resin, the air chambers (42, 43, 45 and 46) are formed in the wall portions (24, 35) constituting the conductor accommodation chambers (39). This enables an impedance to be enhanced even if the dielectric (22) is made of a material having high rigidity.