Abstract
As of today, the application of space-time modulated media has been limited to parametric amplification, nonreciprocity, and frequency mixing. This article exhibits the functionality of the space-time modulated medium as a surface-wave antenna and demonstrates that a space-time modulated medium makes a perfect antenna. We first present the analytical solution for electromagnetic fields inside a space-time modulated medium. The analytical solution reveals the existence of surface-waves in such a medium as well as their temporal and spatial frequencies. We next introduce the concept of space-time surface-wave antenna system, where the transition of space-wave to surface-wave is utilized for a pure signal receive. The analytical solution is supported by FDTD numerical simulation of the medium, which gives a more in-depth insight into the analysis of the structure. The study is expected to pave the way for further study on the application of space-time media in antenna systems.
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