Wearable Antenna Capacitance Sensing for Wrist Posture Detection
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Solution Overview
Problem
Existing wearable devices face challenges with optical sensors requiring high optical path sealing and capacitive sensors needing separate design, which are volume-limited in miniaturized smart devices, necessitating additional components that complicate assembly and design.
Innovation Solution
An antenna apparatus for smart wearable devices utilizing an antenna base, watchband, and antenna body to determine wearing posture through detection capacitance, adjusting capacitance values for optimal performance based on user hand orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensors are used for wearing detection, then detection accuracy is improved, but device complexity and assembly difficulty increase due to high optical path sealing requirements and additional filter components
Solution Approach 1:
The patent combines the antenna structure with the wearing detection function by utilizing the antenna base and watchband as capacitive sensing elements. The antenna base serves dual purposes: as part of the antenna structure for wireless communication and as one electrode of the detection capacitor, while the watchband forms the other electrode. This integration eliminates the need for separate optical sensors and filter components, reducing assembly complexity while maintaining detection capability
Solution Approach 2:
The antenna base is designed to serve multiple functions: it acts as part of the antenna for wireless signal transmission and reception, serves as an electrode for capacitive sensing, and provides structural support. This multi-functionality reduces the number of components needed and simplifies the overall device structure, directly addressing the assembly complexity issue
2Device complexity
If capacitive sensors are used for wearing detection, then device structure is simplified, but sensing capacitor design requires separate consideration and is constrained by device volume
Solution Approach 1:
The patent merges the sensing capacitor design with the existing antenna structure. The antenna base and watchband, which are already present in the device, are utilized as the capacitor electrodes. This approach eliminates the need for separate sensing capacitor components, thereby simplifying the structure and reducing the volume required for sensing functionality
3Measurement precision
If additional sensor components are added for wearing detection, then detection capability is improved, but device volume and design complexity increase
Solution Approach 1:
The antenna base is designed to serve multiple functions: it acts as part of the antenna for wireless signal transmission and reception, serves as an electrode for capacitive sensing, and provides structural support. This multi-functionality reduces the number of components needed and simplifies the overall device structure
Solution Approach 2:
The patent combines the antenna structure with the wearing detection function by utilizing the antenna base and watchband as capacitive sensing elements. This integration eliminates the need for separate optical sensors and filter components, reducing assembly complexity while maintaining detection capability
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
Enables accurate detection of wearing posture without additional sensors, optimizing antenna performance for left or right hand use, reducing device size and complexity while maintaining efficient wireless communication.
Implementation Method 1
an antenna body coupled to the antenna base... the antenna body and the antenna base constitute a detection capacitance
Data Source
AI summary
Disclosed are an antenna apparatus for a smart wearable device and a smart wearable device. The antenna apparatus for the smart wearable device includes an antenna base, a watchband electrically connected to the antenna base, an antenna body coupled to the antenna base, and a wearing posture detection circuit electrically connected to the antenna body. When the smart wearable device is worn on a user, a length formed from a tangent point between the watchband and a user's arm to a connection point between the watchband and the antenna base is a first length, and the wearing posture detection circuit is configured to determine worn posture of the smart wearable device according to the first length.