Broadband Fabry-Pérot antenna with non-Foster metasurface - how to test the basic idea?

Recently, an idea of a broadband Fabry-Perot (FT) antenna, ground plane of which is replaced by a non-Foster surface has been introduced theoretically. In this contribution, a basic concept of FP antenna with non-Foster metasurface is renewed together Kith a brief analysts of stability issues. Finally, a simple ID hardware demonstrator, intended for experimental verification of the basic idea, is proposed.