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Capacitance Characteristics of Glass-Embedded Interdigitated Capacitors for Touch Sensing Applications.

Apichart Kaewcharoen1,2, Kirote Arpanutud3, Prayoot Akkaraekthalin4

  • 1High Frequency Systems Laboratory, King Mongkut's University of Technology North Bangkok, Bangkok 10800, Thailand.

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|November 27, 2025
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Summary
This summary is machine-generated.

This study explores glass-embedded interdigitated capacitive sensors (IDCS) for touch sensing. Wider electrodes enhance touch sensitivity and uniformity in smart-glass applications.

Keywords:
capacitance modelingequivalent circuit modelingglass-embedded structureinterdigitated capacitive sensortouch sensing

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Human-Computer Interaction

Background:

  • Interdigitated capacitive sensors (IDCS) are crucial for touch-sensing interfaces.
  • Optimizing electrode geometry is key for performance in smart-glass applications.

Purpose of the Study:

  • Investigate capacitance characteristics of glass-embedded IDCS for touch sensing.
  • Analyze baseline and touch-induced capacitance variations.
  • Provide guidelines for optimizing electrode geometry.

Main Methods:

  • Developed a multilayer analytical model for baseline capacitance calculation.
  • Utilized experimental validation with sensor prototypes.
  • Employed an equivalent circuit model for the touched state.

Main Results:

  • Baseline capacitance decreased with increasing electrode width (28.6 pF to 12 pF).
  • Touch-induced capacitance change ranged from 0.6-0.9 pF.
  • Touch sensitivity increased with electrode width (1.7-4.6% to 5-7.6%).

Conclusions:

  • Narrower electrodes yield higher absolute capacitance.
  • Wider electrodes improve touch sensitivity and uniformity.
  • The proposed IDCS configuration is practical for glass-integrated touch sensors.