Strip-Shaped Ground Circuit for Antenna Miniaturization
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Solution Overview
Problem
Conventional electronic devices face a reduction in antenna radiation efficiency when miniaturizing the antenna module, leading to shorter signal transmission distances due to the design of the antenna ground plate within the circuit board.
Innovation Solution
A circuit board design with a strip-shaped ground circuit occupying at most 50% of the ground surface area, featuring annular bodies with gaps, improves antenna radiation efficiency by optimizing the placement and distribution of the ground circuit along the edges of the circuit board, allowing for continued miniaturization while maintaining efficient signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna module is miniaturized to meet portability requirements, then the size and weight of the electronic device are reduced, but the antenna radiation efficiency decreases
Solution Approach 1:
The ground circuit is moved from a two-dimensional planar configuration to a three-dimensional configuration by routing it through the thickness of the circuit board (from first surface to second surface). This vertical dimensionality change allows the ground circuit to provide sufficient grounding area and electrical connection without occupying excessive planar space, thereby maintaining antenna radiation efficiency while enabling antenna module miniaturization.
Solution Approach 2:
The ground circuit is nested within the circuit board structure itself, utilizing the board's thickness and internal layers. The ground circuit path is embedded through the circuit board body, connecting the first surface to the second surface, effectively nesting the grounding function within the existing structural envelope rather than adding external ground plates.
2Volume of moving object
If the antenna module is miniaturized, then the electronic device becomes more compact, but the signal transmission distance is reduced
Solution Approach 1:
By transitioning the ground circuit to a three-dimensional configuration through the circuit board thickness, the invention maintains effective grounding without increasing the antenna's planar dimensions. This preserves the antenna's ability to transmit signals over required distances while achieving miniaturization of the overall antenna module.
3Ease of manufacture
If a conventional antenna ground plate design is used, then the antenna module can be assembled, but the ground circuit occupies excessive area and reduces antenna radiation efficiency
Solution Approach 1:
The ground circuit is routed vertically through the circuit board thickness rather than extending horizontally on the surface. This dimensional change reduces the planar area occupied by the ground circuit from potentially large surface areas to a compact path through the board's thickness, maintaining manufacturability while dramatically improving antenna radiation efficiency.
Solution Approach 2:
The ground circuit is segmented into multiple sections along its path through the circuit board, including vertical segments through the board thickness and horizontal segments on the surfaces. This segmentation allows the ground circuit to achieve effective electrical connection while minimizing the continuous area it occupies on any single plane.
Data Source
AI summary
An electronic device is provided, in which an antenna module for receiving and transmitting radiation signals is disposed on a mounting surface of a circuit board, and an inner layer of the circuit board is formed with a ground surface to arrange a strip-shaped ground circuit along the edges of the ground surface so that the ground circuit occupies at most 50% of the area of the ground surface to improve antenna radiation efficiency.