Dual-mode metamaterial transformation optics overcomes narrow bandwidth limitations of invisibility cloaks and similar devices

https://www.eurekalert.org/news-releases/1120369

"controlling light/ EM by mapping path to material's properties requires complex materials, overcome using simultaneously: Fabry-Pérot resonances (multiple frequency bands in all directions), Brewster-Effect transmission (ultra-broadband in single direction)... metallic slot cavities filled with dielectrics, >88.4% transparent across X-band, 70° viewing angle, nearly 100% efficiency reflecting light to source across X/ K-bands, 10X increased bandwidth... stealth technology, 6G/ 7G networks, advanced beam-steering"