Asymmetric Skin-to-Electrode Impedance Characteristics of Concentric Circular Ring Electrode for Monitoring of Electrical Activity of the Heart

In order to monitor electrical activity of the heart during daily life, we present an electrode which is composed of concentric circles. It was made from the basis of the Laplacian equation and implemented on PCB coated with gold. So that it does not cause the uncomfortable feeling of contact and possible skin troubles which are typical shortcoming of the conventional ECG measurement. The provided method utilized three concentric circles on FR-4 substrate, so new amplifier regarding measuring of small biological signal is considered which has the characteristics of asymmetric input impedance since are of concentric circular ring electrode is not identical. Thereby electrical activity of the heart was obtained successfully. However, its signal quality is a little bit degraded and the motion artifact still remains as a major problems as is in convention measurement. Certainly stable measurement setup was needed to reduce the motion artifact originated from variation in static electricity between skin and electrode interface