Abstract: In one embodiment, an electrical isolator includes a first electrical component and a second electrical component configured to wirelessly communicate electrical signals with each other. The electrical isolator includes an isolation barrier that has one or more dielectric layers that electrically isolate the first electrical component from the second electrical component. The electrical isolator further includes one or more dielectric layers between a substrate on which the isolator is mounted and the isolation barrier, where the one or more dielectric layers between the substrate and the isolation barrier include (1) one or more thin dielectric layers; and (2) one or more thick dielectric layers that reduce a parasitic electrical coupling between the substrate and at least one of the first electrical component and the second electrical component.