Simulation Analysis of Inter-digital Electrodes Sensor Based on HFSS

In the past few decades, as people have become more and more concerned about physical health, a large number of studies have been used to measure physiological information (such as heart rate, respiration, and blood pressure), which provides great value for predicting diseases. As a component of sensors, interdigital electrodes have developed rapidly in the field of sensors and are widely used in the field of biological detection. Moreover, interdigital electrodes can be non-invasive, low-cost, reliable, and not affected by environmental conditions, making interdigital electrodes’ performance more important. This paper proposes a method to simulate and optimize interdigital electrodes’ performance through HFSS. Firstly, the equivalent circuit model of the interdigital electrode is studied and calculated, and the initialization sensor parameters are obtained. Then the effects of electrode length, electrode width, spacing, and substrate thickness on the performance of interdigital electrodes are analyzed by simulation, and the interdigital electrode model is optimized to better detect some physiological information about the human body. In addition, the detection of human physiological information is simulated, which can provide a reference for future research.