A Metasurface Design for Enhancing In-Body Signal Transmission in Biomedical Microwave Imaging

In this paper, we present a metasurface for improving signal penetration inside biological medium and reducing the reflection at the air-tissue interface for microwave imaging applications. We started from the design of a common bow-tie antenna working at 2.56 GHz and then we developed a
$\boldsymbol{5\times 5}$
metasurface to be interposed between the antenna and the tissue. The numerical simulation demonstrated that the transmission coefficient in presence of the designed metasurface is 6.8 dB higher than the isolated bow-tie case. Moreover, the combination of compactness and easy fabrication makes this design appropriate for future integration in portable systems.