Textured Electrode Layout for Sensitive Electric Field Sensing
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Solution Overview
Problem
The sensitivity of electrodes used in quasi-static electric field measurement systems is low, particularly in systems employing solid electrodes, which limits their effectiveness in detecting disturbances caused by objects entering the electric field.
Innovation Solution
The electrode arrangement includes a nonconductive substrate with a first conductive layer for the receiving electrode and a second conductive layer for the transmitting electrode, where the second electrode covers a larger area and is textured to reduce capacitance between the electrodes, such as through hash or hatch patterns, cut-out areas, or grooves, enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid electrodes are used in quasi-static electric field measurement systems, then the structure is simple and manufacturing is easy, but the sensitivity is low
Solution Approach 1:
The transmitting electrode is segmented into multiple conductive elements arranged in a grid pattern, transforming a solid electrode into a structured array. This segmentation reduces the capacitance between transmitting and receiving electrodes while maintaining the overall electrode area, thereby improving sensitivity without excessive complexity
Solution Approach 2:
Different regions of the electrode structure are assigned different functions: the transmitting electrode grid provides field generation with reduced capacitance, while the receiving electrode maintains full area for optimal signal detection. This local differentiation optimizes both sensitivity and functionality
2Area of stationary object
If the transmitting electrode covers a larger area, then the electric field coverage is improved, but the capacitance between transmitting and receiving electrodes increases reducing sensitivity
Solution Approach 1:
The large-area transmitting electrode is divided into a grid of conductive elements separated by nonconductive material. This segmentation maintains the overall large area for broad electric field coverage while reducing the effective capacitance by introducing nonconductive spacing between conductive regions
Solution Approach 2:
The electrode structure uses composite construction with conductive materials for field generation and nonconductive materials for spacing and support. This composite approach allows the transmitting electrode to maintain large area coverage while the nonconductive portions reduce parasitic capacitance to the receiving electrode
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 design significantly improves the sensitivity of the electric field sensor system, allowing for more accurate detection of objects, such as a user's hand, by minimizing capacitance and optimizing signal sensitivity.
Implementation Method 1
the first and/or second electrode is textured to reduce the capacitance between the first and second electrode
Implementation Method 2
The field may be generated by a 30-200 kHz, in particular a 70-140 kHz or a 40-115 kHz, signal and thus is quasi-static in the near field
Data Source
AI summary
An electrode arrangement for an electric field sensor device with a transmitting electrode and at least one receiving electrode may have a nonconductive substrate having a first conductive layer and a second conductive layer. A first electrode is arranged within the first conductive layer, wherein the first electrode is a receiving electrode of the electric field sensor device, and a second electrode is arranged within the second conductive layer, wherein the second electrode is a transmitting electrode of the electric field sensor device wherein the second electrode covers a larger area than the first electrode and wherein the second electrode is textured to reduce the capacitance between the first and second electrode.