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Vol. 228, Issue 12, December 2018, pp. 71-78




Geometry Dependence of the Response of Inter-digital Capacitive Structures:
A Finite Element Analysis

1 Sheeja P. George, 2 Johney Issac and 3 Jacob Philip

1 College of Engineering, Chengannur, Alappuzha, 689121, Kerala, India
2 Department of Instrumentation, Cochin University of Science and Technology, Cochin, 682022, Kerala, India
3 Amal Jyothi College of Engineering, Kanjirappally, Kottayam 686518, Kerala, India
1 Tel.: +91-949-595-6861

1 E-mail: sheejapgmanoj@yahoo.com


Received: 19 July 2018 /Accepted: 30 November 2018 /Published: 31 December 2018

Digital Sensors and Sensor Sysstems


Abstract: Inter-digital capacitive sensors with planar geometry are under development for a variety of applications. Variations in the geometry of such planar inter-digital capacitive transducer structures exhibit changes in their response in terms of the corresponding capacitance variations. In this work we present a performance evaluation of the response of inter-digital capacitive structures based on the differences in the geometry of their inter-penetrating comb patterns. All the geometries under consideration are fabricated following the same procedure on printed circuit boards made of FR4. The capacitance values for each configuration have been measured directly. The capacitance values for the same configurations have been evaluated by simulation using the Finite element analysis tool, ANSYS. Parameters like finger spacing, relative permittivity and medium thickness have been varied in simulation and system performance analyzed. A comparison between measured and simulated values have been carried out and the results are presented. The results enable one to predict the capacitance values and sensor performance of IDC structures of this type. The procedure can be adapted to other types of structures as well.


Keywords: Inter-digital capacitive structures, Inter-digital transducers, Inter-penetrating comb patterns, Finite element analysis.


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