Wearable Antenna Frame Layout Against Body Wave Absorption
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Solution Overview
Problem
Wearable devices with metal casings as antennas face challenges in reducing size and maintaining efficiency due to electromagnetic wave absorption by the human body when worn.
Innovation Solution
A wearable device design featuring a conductive bottom shell, a conductive frame acting as an antenna, an insulating member, and a circuit board, where the insulating member separates the conductive bottom shell from the conductive frame, and the conductive bottom shell is positioned between the human body and the antenna to reduce wave absorption, enhancing antenna efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the metal casing is used as an antenna, then the device size can be reduced, but the antenna efficiency deteriorates due to electromagnetic wave absorption by the human body
Solution Approach 1:
The patent divides the conductive structure into separate components: a conductive frame serving as the antenna and a conductive bottom shell serving as a reflective plate. This segmentation allows each component to perform its specific function independently, with the bottom shell reflecting electromagnetic waves to improve antenna efficiency while the frame maintains the device's compact size.
Solution Approach 2:
An insulating member is introduced as an intermediary between the conductive frame (antenna) and the conductive bottom shell (reflective plate). This insulating member prevents direct electrical contact while allowing the bottom shell to function as a reflective surface, thereby improving antenna efficiency without compromising the compact design.
2Shape
If the antenna is designed inside the metal casing, then the appearance can be fine-looking, but the device size reduction becomes difficult
Solution Approach 1:
The conductive frame serves dual functions: it provides the structural framework for the device and simultaneously acts as the antenna element. This multi-functionality allows the antenna to be integrated into the device structure without adding extra components, maintaining a fine-looking appearance while enabling size reduction.
Solution Approach 2:
The patent merges the antenna function with the conductive frame structure. By making the frame itself the antenna element, the design eliminates the need for separate antenna components, thereby maintaining aesthetic appearance while reducing overall device size.
3Reliability
If the wearable device is worn on the human body, then the antenna efficiency deteriorates due to electromagnetic wave absorption, but the device must remain compact
Solution Approach 1:
The patent converts the harmful effect of the human body absorbing electromagnetic waves into a beneficial effect by using the conductive bottom shell as a reflective plate. The reflective plate redirects electromagnetic waves that would otherwise be absorbed by the human body, improving antenna efficiency while maintaining the compact wearable design.
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
The design allows for a compact wearable device with improved antenna efficiency by minimizing electromagnetic wave absorption, maintaining performance while providing a fine-looking appearance.
Implementation Method 1
The conductive bottom shell may be configured to reflect the energy of the antenna to converge the energy
Implementation Method 2
the conductive frame is adapted to resonate at a first frequency band, and the length from the feeding terminal to the first ground terminal is one-half wavelength of the first frequency band
Data Source
AI summary
A wearable device includes a conductive bottom shell, a conductive frame, an insulating member, and a circuit board. The conductive frame is disposed above the conductive bottom shell and separated from the conductive bottom shell. The conductive frame functions as an antenna and includes a feeding terminal and a first ground terminal. The insulating member is disposed between the conductive bottom shell and the conductive frame and prevents the conductive bottom shell from conducting electricity to the conductive frame. The circuit board is disposed inside the conductive frame, separated from the conductive bottom shell and disposed between the insulating member and the conductive frame. The feeding terminal and the first ground terminal are electrically connected to the circuit board.