Antenna Grounding Segmentation for Metal Plane Coupling
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Solution Overview
Problem
The presence of a large metal plane in wireless communication devices, such as notebook computers, affects the impedance matching and radiation patterns of monopole antennas, making it difficult to improve antenna efficiency, reduce size, and increase bandwidth.
Innovation Solution
An antenna structure that includes a radiation element and a grounding element with an L shape, where the grounding element's third section is substantially parallel to the radiation element's first section, allowing for adjusted current direction and reduced coupling effects from the metal plane, thereby improving impedance matching and radiation patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a large metal plane is used in the housing, then structural strength and shielding are improved, but antenna impedance matching and radiation patterns deteriorate due to coupling effects
Solution Approach 1:
The grounding element is segmented into multiple sections (first grounding section, second grounding section, third grounding section) instead of using a continuous large metal plane. This segmentation reduces the coupling effect while maintaining the necessary grounding function and structural support.
Solution Approach 2:
The grounding element acts as an intermediary between the radiation element and the metal plane housing. By positioning and configuring the grounding element specifically, it mediates the interaction between the antenna and the metal plane, reducing harmful coupling effects while maintaining structural integrity.
2Volume of moving object
If antenna size is reduced, then device integration is improved, but antenna efficiency and bandwidth deteriorate
Solution Approach 1:
The antenna structure extends in multiple dimensions with the radiation element having first, second, and third sections oriented in different directions. This multi-dimensional configuration allows the antenna to achieve sufficient radiation efficiency and bandwidth within a compact volume by utilizing spatial distribution rather than increasing single-dimension size.
Solution Approach 2:
Different sections of the radiation element and grounding element have different lengths and orientations optimized for their specific functions. The first section, second section, and third section each have tailored dimensions to optimize local radiation characteristics while maintaining overall compactness and efficiency.
3Ease of manufacture
If a conventional monopole antenna is used, then manufacturing simplicity is maintained, but antenna performance deteriorates due to metal plane coupling
Solution Approach 1:
The grounding system is segmented into multiple discrete sections rather than using a continuous ground plane, which simplifies manufacturing while reducing coupling effects. The segmented grounding elements can be independently positioned and connected, maintaining ease of assembly while improving radiation pattern quality.
Data Source
AI summary
An antenna structure includes a radiation element, a grounding element, and a feeding point. The radiation element includes a first section and a second section coupled to the first section. The grounding element includes a third section and a fourth section coupled to the third section. The third section is substantially parallel to the first section. The feeding point is coupled between the second section of the radiation element and the fourth section of the grounding element.