Antenna-Based Proximity Sensing for Compact Wireless Devices
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Solution Overview
Problem
Conventional proximity sensors hinder miniaturization and increase power consumption in wireless devices by requiring openings or windows for signal emission and continuous detection.
Innovation Solution
A proximity sensor utilizing an antenna electrode and detecting circuitry to detect electrical parameters, such as capacitance or return loss, to determine the distance between the device and a user's body part, eliminating the need for signal emission and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional proximity sensor is used for proximity detection, then proximity sensing function is achieved, but device size increases and power consumption increases
Solution Approach 1:
The patent combines the proximity detection function with the existing antenna structure by using the antenna as the detection electrode. The antenna serves dual purposes: wireless communication and proximity sensing. This merging eliminates the need for a separate proximity sensor component, thereby reducing device size while maintaining detection functionality.
Solution Approach 2:
The antenna is designed to perform multiple functions simultaneously: it acts as both a wireless communication antenna and a proximity detection sensor. By making the antenna universal for both communication and sensing purposes, the patent avoids adding extra components, thus reducing overall device volume.
2Measurement precision
If a conventional proximity sensor is used for proximity detection, then proximity sensing function is achieved, but power consumption increases
Solution Approach 1:
The patent merges the proximity detection function with the antenna, allowing the antenna to serve as the detection electrode. This eliminates the need for a separate power supply and control circuitry for a dedicated proximity sensor, thereby reducing overall power consumption while maintaining detection accuracy.
Solution Approach 2:
The antenna performs proximity detection using its own structure and electrical characteristics without requiring external detection components. The antenna's capacitance changes naturally due to proximity effects, and these changes are detected through existing RF circuitry, making the system self-sufficient and reducing power requirements.
3Measurement precision
If separate detection components are added for proximity sensing, then detection accuracy is improved, but device miniaturization is hindered
Solution Approach 1:
The patent merges the proximity detection electrode with the antenna structure, eliminating the need for separate detection components. The antenna itself becomes the sensing element, reducing component quantity and simplifying device architecture while maintaining detection accuracy through capacitance-based sensing.
4Measurement precision
If conventional proximity sensor components are used, then proximity detection is achieved, but component re-usage and downscaling are limited
Solution Approach 1:
The antenna is designed to be universal, serving both wireless communication and proximity detection functions. This multi-functionality allows the same component to be reused for different purposes, enhancing adaptability and enabling downscaling by eliminating the need for dedicated proximity sensor components.
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 significant miniaturization and reduced power consumption by integrating the proximity sensor with the device's antenna, allowing for compact design and efficient operation without emissions.
Implementation Method 1
the electrical parameter reflects capacitance between the antenna electrode and a referential point, and the detecting circuitry includes capacitance sensing circuitry configured to detect the capacitance
Data Source
AI summary
Disclosed are a proximity sensor, a method for sensing proximity of a wireless device to a body part of a user, and a wireless device. The proximity sensor includes an antenna electrode and detecting circuitry. The antenna electrode serves as at least a part of an antenna of the wireless device. The detecting circuitry is electrically coupled to the antenna electrode, and is configured to detect an electrical parameter of the antenna electrode and output an operating signal based on the electrical parameter. A distance between the antenna electrode and a body part of a user is determined based on the operating signal.