Polarized Antenna Pattern Layout for Stable Resonance in Small Antennas
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Solution Overview
Problem
Existing antenna devices face challenges in reducing size while maintaining performance, particularly due to manufacturing variations that affect resonance frequency and directivity.
Innovation Solution
The antenna device incorporates a dielectric substrate with antenna patterns that include narrower line patterns and pattern-removed regions, which reduce capacitance and increase inductance, allowing for a smaller size and minimizing the impact of manufacturing variations on resonance frequency and directivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna element size is reduced to achieve higher operation frequency, then the antenna size is reduced, but the performance becomes more sensitive to manufacturing variations
Solution Approach 1:
The patent changes the geometric parameters of the antenna pattern by introducing pattern-removed regions and narrower line patterns. This modifies the electrical characteristics (capacitance and inductance) of the antenna element, allowing it to resonate at the desired frequency while being less sensitive to manufacturing tolerances. The specific parameter changes include reducing the width of line patterns in certain regions and removing patterns in other regions to achieve the optimal balance between size and manufacturing robustness.
2Volume of moving object
If narrower line patterns are used to reduce capacitance, then the antenna size is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent segments the antenna pattern into different regions with different line widths. Instead of using a uniform narrow line pattern throughout, the design incorporates both narrower line patterns (to reduce capacitance) and pattern-removed regions (to adjust inductance). This segmentation allows the antenna to achieve the desired electrical characteristics while distributing the manufacturing tolerance requirements across different regions, reducing the overall sensitivity to any single dimension's precision.
3Reliability
If pattern-removed regions are introduced to increase inductance, then the resonance frequency is stabilized, but the device complexity increases
Solution Approach 1:
The patent applies local quality by introducing pattern-removed regions in specific locations on the antenna pattern. These removed regions are strategically placed to increase the inductance in areas where it is most needed for frequency stabilization. Rather than uniformly complicating the entire antenna structure, the design selectively modifies only the necessary regions, thereby achieving resonance frequency stability while minimizing the overall increase in device complexity.
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 enables a reduction in antenna size while stabilizing resonance frequency and directivity, even with manufacturing variations, as demonstrated by simulation results showing minimal frequency shifts and directional stability.
Implementation Method 1
The antenna patterns resonate in one or more resonance directions to incident waves having an operating frequency of the antenna part, thereby generating emitted waves having polarized waves different from those of transmitted/received waves
Data Source
AI summary
An antenna device includes a dielectric substrate having a first surface on which an antenna part is formed and a second surface on which a base plate is formed. The antenna part has one or more antenna patterns configured to act as radiating elements. The antenna patterns resonate in one or more resonance directions to incident waves having an operating frequency of the antenna part, thereby generating emitted waves having polarized waves different from those of transmitted/received waves which are transmitted/received by the antenna part. For each of the resonance directions, the antenna patterns include at least one line pattern having a width which is narrower than the total width of the antenna patterns in a direction perpendicular to the resonance direction.