Analytical Approach for Metasurface Matching Layer Design for Electric Field Maximization in Biological Tissues

The application of an electromagnetic field inside biological tissues can be advantageous in several applications, from physiological parameters monitoring to microwave imaging. In those cases, the maximization of the transmitted signal is desired. Therefore, designing a matching layer able to reduce unwanted reflections at the air/skin interface is a relevant issue. The employment of a metasurface can be useful since it may reduce the thickness of the matching layer. Here we propose an analytical method for the design of matching layers to maximize the electric field inside the muscle tissue. Two cases are considered: when the matching layer consists of solely a dielectric, and when a metasurface is placed upon a dielectric substrate.