Stylus Pen Antenna Layout to Reduce Hand-Holding Interference
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Solution Overview
Problem
The challenge in designing an antenna for a stylus pen is to minimize space occupation while maintaining performance, especially when integrated with existing metallic components, and to reduce the impact of hand holding during use.
Innovation Solution
The antenna is designed using existing metallic components of the stylus pen, such as a loop or planar inverted-F antenna, with parts located outside the pen barrel and connected via a through hole, and dual slot antennas are strategically placed near the pen nib and end parts to ensure performance across different usage scenarios, with the option to switch between them using a transmit antenna selection system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna is disposed inside the pen barrel, then the structure is compact, but the antenna performance is degraded due to hand holding impact
Solution Approach 1:
The antenna is segmented into two parts: a feed port located inside the pen barrel and a metallic radiator located outside the pen barrel. This segmentation allows the antenna to benefit from both compact integration (feed port inside) and reduced hand holding impact (radiator outside), resolving the contradiction between space occupation and antenna performance
Solution Approach 2:
A through hole in the pen barrel serves as an intermediary structure, allowing the metallic radiator to extend from inside to outside the pen barrel while maintaining structural integrity. This intermediary enables the antenna to achieve both compactness and performance by connecting the internal feed port with the external radiator
2Adaptability or versatility
If more functions are integrated into the stylus pen, then the functionality is enhanced, but the antenna layout space is reduced
Solution Approach 1:
The metallic components of the stylus pen (pen barrel, pen clip, etc.) are designed to serve dual purposes: maintaining structural integrity and aesthetic appearance while simultaneously functioning as the antenna radiator. This multi-functionality eliminates the need for separate antenna space, allowing more functions to be integrated without compromising antenna layout
Solution Approach 2:
The antenna function is merged with the existing metallic components of the stylus pen. The pen barrel, pen clip, or other metallic parts are designed to incorporate the radiator function, combining the structural and communication functions into a single integrated design, thereby saving space for additional features
3Volume of moving object
If the antenna is designed using existing metallic components, then the space occupation is reduced, but the manufacturing complexity increases
Solution Approach 1:
The existing metallic components of the stylus pen serve themselves as the antenna radiator, eliminating the need for separate antenna structures. The metallic pen barrel, pen clip, or other components inherently possess the electrical conductivity and geometric properties needed for radiation, allowing them to perform both their original function and antenna function without additional complexity
Data Source
AI summary
A stylus pen includes a pen barrel extending along a longitudinal axis, and the pen barrel includes a main body, a pen nib part disposed at one end of the main body, and a pen end part disposed at another end of the main body and that corresponds to the pen nib part; and an antenna disposed on the main body of the pen barrel, where at least one part of the antenna is located outside the pen barrel and is close to the pen nib part and/or the pen end part, and the antenna comprises a loop antenna or a planar inverted-F antenna close to the pen end part.