The models are made from a liquid-gel material that mimics the human body’s complex relative permittivity, dielectric constant, loss factor, and conductivity. Specifically, they will help to assess the transmission of electromagnetic waves in the UWB (ultra-wide band) frequency between 3.1 and 10.6 GHz. They were created in response to growing interest in medical devices such as sensors and monitoring systems that are implanted in the body. These tiny devices are a cutting-edge, non-invasive way to diagnose and treat certain medical conditions. They communicate wirelessly through the body’s tissue. The synthetic models will help minimize the number of tests on animals and humans.