Biometric Sensor Electrode Assembly for Wearable Antenna Coupling
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Solution Overview
Problem
Wearable computing devices face challenges in integrating necessary components due to limited form factor, particularly in improving the operation of antennas within these devices.
Innovation Solution
A sensor assembly is integrated into wearable computing devices, featuring biometric sensor circuits, electrodes, and an antenna electrically coupled to improve radiation efficiency without additional space requirements, using conductive foam pads and metallic electrodes for RF coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional antenna components are added to improve radiation efficiency, then antenna performance is improved, but device form factor constraints are violated
Solution Approach 1:
The patent combines the antenna with existing biometric sensor electrode structures, merging two separate functions (biometric sensing and antenna operation) into a single integrated assembly. This allows the antenna to benefit from the electrode's conductive properties and spatial arrangement without requiring additional dedicated antenna components, thereby improving radiation efficiency while maintaining compact form factor constraints
Solution Approach 2:
The electrode structure serves dual purposes: it functions as both a biometric sensor component for health monitoring and as an antenna element for wireless communication. This multi-functionality eliminates the need for separate antenna components, resolving the contradiction between improving antenna performance and maintaining limited device volume
2Volume of moving object
If antenna components are integrated into existing structures, then space is saved, but manufacturing complexity increases
Solution Approach 1:
The patent divides the electrode structure into distinct functional segments (signal electrode, reference electrode, and antenna element) that can be independently fabricated and then assembled. This segmentation allows each component to be optimized separately during manufacturing while still achieving integrated functionality, thereby reducing overall manufacturing complexity compared to creating a fully integrated monolithic structure
Solution Approach 2:
The patent introduces conductive foam pads as intermediary elements that facilitate electrical coupling between the electrode structures and the antenna. These foam pads serve as flexible connectors that simplify the assembly process by providing easy-to-implement electrical connections without requiring complex soldering or direct bonding, thus easing manufacturing while maintaining compact integration
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 solution enhances antenna radiation efficiency by at least 2 decibels, particularly in LTE frequency bands, while maintaining aesthetic appeal and functional integration with biometric sensor circuits.
Implementation Method 1
the antenna can be radio-frequency coupled to the one or more electrodes
Data Source
AI summary
A sensor assembly is provided. The sensor assembly includes a printed circuit board and one or more biometric sensor circuits coupled to the printed circuit board. The sensor assembly includes a cover having one or more electrodes disposed on an outer side of the cover coupled to one or more electrical traces disposed on an inner side of the cover. The one or more electrical traces are electrically coupled to the one or more biometric sensor circuits. The sensor assembly also includes an antenna electrically coupled to the one or more electrodes. Wearable computing devices incorporating the sensor assembly are also provided.