Wearable Antenna-Touchpad Layout for Cross-Body Link Stability
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Solution Overview
Problem
Wearable devices face challenges due to the competition for space between antennas and touchpads, leading to larger, cumbersome designs and connectivity issues caused by their close proximity, which affects performance and comfort.
Innovation Solution
A combined metal structure functions as both an antenna and a touchpad, positioned within the housing to be parallel to the PCB, with the PCB shielding the antenna from the body to prevent loss and enhance coupling, allowing for a more efficient and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate antenna and touchpad components are used, then functionality is provided, but device size increases and components compete for space
Solution Approach 1:
The patent combines the antenna and touchpad into a single integrated component structure. The antenna element is formed as part of the touchpad assembly, where the conductive traces that form the antenna are also the conductive elements that detect touch input. This merging eliminates the need for separate antenna and touchpad components, reducing the overall device area while maintaining both wireless communication and touch control functionality.
Solution Approach 2:
The integrated component serves multiple functions simultaneously: it acts as both an antenna for wireless signal transmission and reception, and as a touchpad for detecting user inputs. The same conductive structure that radiates electromagnetic signals also functions as the sensing element for touch detection, thereby providing universal functionality with a single component.
2Area of stationary object
If antenna and touchpad are positioned in close proximity, then space is saved, but connectivity issues arise between accessory and host device
Solution Approach 1:
By merging the antenna and touchpad into a single integrated component, the patent eliminates the proximity-induced interference problem. The integrated design ensures that the antenna traces and touch sensing elements are electrically isolated through the substrate material, preventing signal coupling issues while maintaining compact form factor. This resolves the connectivity reliability issue that arises when separate components are placed in close proximity.
3Area of stationary object
If antenna is positioned close to the body, then compact design is achieved, but body interference causes signal loss
Solution Approach 1:
The patent positions the integrated antenna-touchpad component specifically on the exterior surface of the housing, away from direct body contact areas. The design incorporates positioning strategies that place the antenna element in locations minimized for body proximity, such as on the outer shell surfaces that do not contact the user's body during wear. This local quality approach maintains compact design while reducing body-induced signal loss.
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
This solution enables improved performance and reduced size of wearable devices by eliminating the need for separate components, enhancing connectivity and reducing susceptibility to body interference, resulting in better user experience and reduced variability.
Implementation Method 1
The PCB may be configured to shield the metal structure from the human body
Implementation Method 2
When the metal structure receives an input, the metal structure may be configured to detect a change in capacitance
Implementation Method 3
An electric field between the PCB and the metal structure may extend in a direction transverse to a tangent of a longitudinal surface of the human body
Data Source
AI summary
The present disclosure provides a metal structure, or antenna radiator, for an accessory that is configured to function as both an antenna and an input control. The device may be a wearable device with a first surface shaped to be in contact with the human body and a second surface shaped to be exposed when the device is being worn. The antenna radiator may be located internally within the housing of the device and coupled to a printed circuit board (“PCB”). The PCB may be located between the antenna radiator and the surface of the housing such that the PCB may shield the antenna radiator from antenna loss due to the human body. An electric field may extend between the PCB and the antenna radiator. The fringe electric field may improve cross-head and cross-body connectivity between the accessory and another device.