Fabry-Pérot antenna-transmitter based on active metasurface: One-dimensional proof-of-concept demonstrator

Although non-Foster broadband metamaterials have been demonstrated both theoretically and experimentally, this concept is still challenging due to inherent stability problems. On the other hand, there is a recent idea of using the unstable non-Foster elements in a broadband tunable radiating system. Here, we propose a concept of a self-oscillating tunable Fabry-Pérot antenna, and verify it by measurements on 1D experimental demonstrator.