Towards a new antenna paradigm with waveform-selective metasurfaces

https://techxplore.com/news/2023-02-antenna-paradigm-waveform-selective-metasurfaces.html

"selectively transmits incoming signals in response to pulse width, applied to antenna design... non-linear metasurfaces change response properties of antenna for waves of same frequency but with different waveforms... selectively receiving/transmitting surface and free-space waves... steering of a main beam, receiving signals under simultaneous incidence, and building a mutual communication system without needing a frequency change or an external power supply"