Antenna Substrate Dielectric Loss Tangent Gap Control
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Solution Overview
Problem
Conventional antennas with a second resonator capacitively-coupled to a first resonator through a gap face a trade-off where narrowing the gap to reduce size degrades radiation efficiency due to increased capacitance.
Innovation Solution
The antenna incorporates a second resonator with a dielectric loss tangent of the substrate part greater than zero but less than or equal to 0.01, allowing for a reduction in gap size while maintaining or enhancing radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the gap between the first conductor part and second conductor part is narrowed to reduce antenna size, then the capacitance of the capacitively-coupling part is increased, but the radiation efficiency of the antenna is degraded
Solution Approach 1:
The patent applies parameter changes by controlling the dielectric loss tangent of the substrate material to be greater than zero and less than or equal to 0.01. This parameter control allows the gap to be narrowed for downsizing while maintaining radiation efficiency, as the low dielectric loss compensates for the increased capacitance effect. The substrate material is selected or designed to meet this specific dielectric loss tangent requirement, enabling both size reduction and efficiency maintenance.
2Length of stationary object
If the gap is narrowed to increase capacitance, then the antenna can be downsized, but the radiation efficiency is degraded
Solution Approach 1:
The patent resolves this contradiction by changing the dielectric parameter of the substrate material. By selecting a substrate with a dielectric loss tangent ≤ 0.01, the negative impact of narrowing the gap on radiation efficiency is counteracted. This allows the gap width to be reduced for compactness while the low dielectric loss ensures that energy is not excessively dissipated, thereby maintaining reliability in terms of radiation efficiency.
3Loss of energy
If the dielectric loss tangent is reduced to maintain radiation efficiency with a narrowed gap, then the antenna can be downsized without efficiency loss
Solution Approach 1:
The patent establishes a specific parameter range for the dielectric loss tangent (greater than zero and less than or equal to 0.01) that balances performance and manufacturability. This parameter specification enables antenna downsizing through gap narrowing while maintaining acceptable radiation efficiency. The defined range provides clear guidance for material selection, making the design process more straightforward despite the stringent requirement.
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 approach enables the downsizing of antennas while maintaining or improving radiation efficiency, even when the gap is narrowed, by controlling dielectric loss tangent.
Implementation Method 1
a second resonator that is fed power by the first resonator according to an electromagnetic field coupling with no contact
Implementation Method 2
a second conductor part capacitively-coupled to the first conductor part through a gap
Data Source
AI summary
An antenna includes a ground plane; a first resonator connected to a feeding point with reference to the ground plane; and a second resonator that is fed power by the first resonator according to an electromagnetic field coupling with no contact. The second resonator includes a first conductor part, and a second conductor part capacitively-coupled to the first conductor part through a gap. A dielectric loss tangent of a substrate part, on which the second resonator is formed, is greater than zero and less than or equal to 0.01.