Antenna Impedance Sensing for Touch and Gesture Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional consumer devices face challenges in detecting touch and gesture interactions due to limited form factor constraints and the need for separate integrated circuits for antenna and touch sensing, leading to false positives and increased real estate usage.
Innovation Solution
Utilizing antennas as sensors (A2S) to detect touch and gesture events by processing A2S signals and microphone signals through a neural network classifier, combining preprocessing techniques to improve accuracy and replace accelerometer-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate integrated circuits are used for antenna and touch sensing, then touch sensing functionality is achieved, but device complexity and hardware real estate increase
Solution Approach 1:
The patent combines antenna and touch sensing functions into a single integrated circuit. The antenna element serves dual purposes: wireless communication and capacitive touch sensing. The same conductive structures and circuitry are used for both RF transmission and touch detection, eliminating the need for separate touch sensing circuits and reducing overall device complexity and hardware footprint.
Solution Approach 2:
The antenna is designed to perform multiple functions simultaneously: it acts as both a wireless communication antenna and a capacitive touch sensor. The conductive antenna elements can detect touch events through changes in capacitance while maintaining their primary function of transmitting and receiving RF signals, thereby providing universal functionality with a single component.
2Adaptability or versatility
If accelerometer-based systems are used for gesture detection, then gesture detection capability is achieved, but false positives increase and hardware requirements increase
Solution Approach 1:
The patent replaces mechanical accelerometer-based gesture detection with capacitive touch sensing. Instead of using mechanical sensors that detect motion and acceleration, the system uses capacitive changes in the antenna structure to detect touch and gesture events. This substitution eliminates the mechanical components and their associated false positive issues while maintaining gesture detection functionality.
Solution Approach 2:
The antenna structure itself serves as the touch sensor without requiring separate sensing elements. The capacitive properties of the antenna elements directly detect touch events, allowing the communication component to self-serve the additional function of gesture detection. This eliminates the need for separate accelerometer hardware and reduces the overall system complexity.
3Power
If antenna structures are optimized for wireless communication, then communication performance is improved, but touch sensing accuracy deteriorates
Solution Approach 1:
The patent applies different design optimizations to different portions of the antenna structure. Certain segments are optimized for RF performance with continuous conductive paths, while other segments incorporate discontinuities or gaps that enhance capacitive coupling for touch sensing. This local differentiation allows each portion of the antenna to excel at its primary function while contributing to the overall dual-functionality of the structure.
Solution Approach 2:
The patent modifies antenna design parameters such as conductor width, gap dimensions, and substrate properties to achieve optimal balance between communication and touch sensing. By adjusting these parameters, the antenna maintains sufficient RF performance while creating enhanced capacitive coupling regions that improve touch sensing accuracy. The design parameters are tuned to allow both functions to operate effectively from the same structure.
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 touch and gesture events with reduced hardware requirements, enhancing user interaction capabilities and reducing false positives.
Implementation Method 1
the characteristics of the antenna change when it is approached by an object, such as a finger or palm of a user
Data Source
AI summary
Technologies directed to providing event detection using Antennas as Sensors (A2S) and microphone signals are described. One method of operating a device includes receiving audio data corresponding to audio captured by at least one microphone of the device, and impedance data from an Antenna as Sensor (A2S) system of the device, the impedance data is digital data representing impedance changes of an antenna captured by the A2S system. The method determines, using the audio data and the impedance data and a machine learning (ML) model, a user input event representing a physical interaction event with the device. The method performs an action in response to the user input event.