Antenna Filter Capacitance Detection for Human Proximity
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Solution Overview
Problem
Existing wireless communication devices face challenges in accurately detecting human proximity due to the requirement of separate human sensors, which complicates device miniaturization and can result in inadequate capacitance value detection.
Innovation Solution
A wireless communication module that incorporates an antenna and a first filter composed of distributed constant elements to function as a capacitance-detecting electrode, enabling accurate human body proximity detection without the need for additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate human sensor is installed to detect human body proximity, then detection function is achieved, but device size increases and manufacturing complexity increases
Solution Approach 1:
The patent combines the antenna and the human body detection sensor into a single integrated structure. The antenna serves dual purposes: wireless communication and capacitance-based proximity detection. This merging eliminates the need for separate sensor components while maintaining detection functionality, directly resolving the contradiction between achieving detection accuracy and reducing device complexity
Solution Approach 2:
The antenna is designed to perform multiple functions simultaneously: it acts as both a wireless communication element and a capacitance sensor for human body detection. By making the antenna universal, the patent eliminates the need for dedicated separate sensors, thereby reducing device complexity while preserving the human body detection capability
2Device complexity
If the antenna element is used as a capacitance detecting element, then device size is reduced, but detection accuracy decreases due to insufficient capacitance value
Solution Approach 1:
The patent segments the antenna structure into multiple conductive patterns arranged in specific configurations. By dividing the antenna into multiple segments or patterns, the total effective capacitance area is increased, which enhances the capacitance value available for detection while maintaining the integrated design that keeps device size small
Solution Approach 2:
The patent employs distributed constant elements arranged in specific geometric patterns (such as interdigitated or mesh structures) that increase the effective surface area and capacitance in a planar configuration. This dimensional arrangement allows the antenna to achieve sufficient capacitance value for accurate detection without increasing the overall device volume, thus resolving the contradiction between compact size and detection accuracy
3Measurement precision
If distributed constant elements are used as filter and electrode, then detection accuracy is improved, but radio communication signal interference may occur
Solution Approach 1:
The patent applies different properties to different parts of the distributed constant elements. The same structure serves as both a filter for radio frequencies and an electrode for capacitance detection, but with locally optimized characteristics. The distributed elements are designed to have frequency-selective properties that allow them to filter communication signals while remaining sensitive to capacitance changes for detection
Solution Approach 2:
The patent changes the electrical parameters of the distributed constant elements to achieve both filtering and detection functions. By carefully selecting the capacitance and inductance values of the distributed elements, the structure is tuned to reject radio communication frequencies while maintaining sensitivity to human body proximity capacitance changes, thus resolving the interference issue while preserving detection accuracy
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 configuration allows for high-accuracy human body detection in a compact design, preventing radio communication signal interference and reducing device size while maintaining effective proximity detection.
Implementation Method 1
an antenna and a first filter which is comprised of distributed constant elements as an electrode to detect capacitance
Implementation Method 2
uses an antenna and a first filter which is comprised of distributed constant elements as an electrode to detect capacitance
Data Source
AI summary
To provide a wireless communication module that implements the function to detect a human body in a conserved space and is capable of detecting a proximity to human bodies with high accuracy. A wireless communication module includes an antenna unit and a proximity detector which detects that a human body has approached the module. The antenna unit includes an antenna and a first filter which is comprised of distributed constant elements. The proximity detector for human bodies uses the antenna and the first filter as an electrode to detect capacitance.