Diseño y simulación de diferentes configuraciones geometrías de electrodos interdigitales

Abstract

Currently the need to optimize the size, energy efficiency and the design of different electronic devices are an everlasting task of engineers for the different applications in electronic circuits that are now part of our lives. Among these components, the capacitor, which is a device capable of storing electrical energy, and specifically the coplanar interdigital capacitor, that consists in positive and negative electrodes distributed in the form of a comb in the same plane on a dielectric substrate is a useful sensor for measuring distances, detecting objects and sensing humidity, temperature, etc. In this work, the simulation of several designs of interdigital electrodes (IDE) was carried out, varying the width of the electrodes (w) and the thickness of the dielectric substrate (t) for a distance between electrodes (d) of 100um and a rectangular work area of 32mm2. The designs were divided into two geometric configurations, a horizontal shape of 4mmx8mm and a vertical shape of 8mmx4mm, that is, two different lengths of the electrodes (3800um and 7800um). The simulated dielectric material was silicon oxide and gold electrodes.