Single-Port Multi-Touch Antenna for RF Touch and Swipe Sensing
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Solution Overview
Problem
Conventional consumer devices face challenges in efficiently utilizing limited form factors for both radio frequency communications and touch sensing due to constraints on physical volume and positioning of touch electrodes and antennas, leading to issues like false positives from environmental vibrations and the need for additional manufacturing steps for cosmetic antenna placement.
Innovation Solution
A single-port multi-touch (SPMT) antenna is used for both RF communications and touch sensing by measuring reflected power in the RF path caused by object proximity, enabling detection of multiple touch points and directional gestures without separate integrated circuits, utilizing multi-frequency monitoring and classification logic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate touch electrodes and antennas are used for touch sensing and RF communications, then touch detection accuracy is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent combines the antenna and touch electrode into a single integrated structure. The antenna elements serve dual purposes: RF signal transmission/reception and touch gesture detection. This merging eliminates the need for separate touch electrodes, reducing device complexity and manufacturing steps while maintaining both RF communication and touch sensing functionalities
Solution Approach 2:
The antenna elements are designed to perform multiple functions simultaneously. The same antenna structure that enables wireless communication also serves as the sensing element for detecting touch gestures, proximity, and orientation. This multi-functionality reduces the overall component count and simplifies the device architecture
2Shape
If cosmetic antenna placement is implemented, then device aesthetics are improved, but additional manufacturing steps are required
Solution Approach 1:
The antenna is integrated directly into the cosmetic surface layer of the device. The same layer that provides the cosmetic finish also contains the antenna elements, eliminating the need for separate antenna placement steps. This approach maintains device aesthetics while simplifying manufacturing by combining cosmetic and RF functions in a single layer
3Ease of operation
If traditional touch electrodes are used, then touch detection is achieved, but false positives from environmental vibrations occur
Solution Approach 1:
The patent replaces traditional mechanical touch electrodes with an electromagnetic-based antenna system for gesture detection. The antenna detects changes in electromagnetic field characteristics caused by gestures, rather than relying on mechanical contact or capacitive changes that are susceptible to vibration interference. This substitution improves reliability by eliminating false positives from environmental vibrations
4Volume of moving object
If limited form factor is constrained, then device portability is improved, but positioning of touch electrodes and antennas becomes difficult
Solution Approach 1:
The integration of antenna and touch electrode into a single element allows flexible positioning within the device's limited form factor. The unified structure can be placed in locations that optimize both RF performance and gesture detection capability, without requiring separate space allocation for distinct components. This merging enables effective component positioning in compact devices
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 SPMT antenna provides advanced touch and gesture detection with a single antenna, reducing manufacturing complexity and improving user experience by eliminating the need for separate touch circuitry and allowing gestures to be interpreted as user commands, enhancing device control.
Implementation Method 1
measuring reflected power in the RF path caused by object proximity
Data Source
AI summary
Technologies directed to antennas as sensors for touch and hover events are described. A wireless device can include a processing device with classification logic and a detection circuit located in a radio frequency (RF) path between a radio and an SPMT antenna. The wireless device can sample the analog voltage signal at a plurality of frequencies over a period of time to obtain digital data. The classification logic uses the digital data to classify one or more touch points caused by a presence of an object in proximity to the SPMT antenna over the period of time as a touch event or a gesture event. The processing device can perform an action in response to the touch event or gesture event.