Affiliation:
1. Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 USA
2. Materials and Manufacturing Directorate Air Force Research Laboratory Wright‐Patterson AFB OH 45433‐7707 USA
3. Zeis Textiles Extension Wilson College of Textiles North Carolina State University Raleigh NC 27606 USA
4. Advanced Science Research Center City University of New York New York NY 10031 USA
5. Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY 13244 USA
Abstract
AbstractLightweight, low‐cost metasurfaces and reflectarrays that are easy to stow and deploy are desirable for many terrestrial and space‐based communications and sensing applications. This work demonstrates a lightweight, flexible metasurface platform based on flat‐knit textiles operating in the cm‐wave spectral range. By using a colorwork knitting approach called float‐jacquard knitting to directly integrate an array of resonant metallic antennas into a textile, two textile reflectarray devices, a metasurface lens (metalens), and a vortex‐beam generator are realized. Operating as a receiving antenna, the metalens focuses a collimated normal‐incidence beam to a diffraction‐limited, off‐broadside focal spot. Operating as a transmitting antenna, the metalens converts the divergent emission from a horn antenna into a collimated beam with peak measured directivity, gain, and efficiency of 21.30, 15.30, and −6.00 dB (25.12%), respectively. The vortex‐beam generating metasurface produces a focused vortex beam with a topological charge of m = 1 over a wide frequency range of 4.1–5.8 GHz. Strong specular reflection is observed for the textile reflectarrays, caused by wavy yarn floats on the backside of the float‐jacquard textiles. This work demonstrates a novel approach for the scalable production of flexible metasurfaces by leveraging commercially available yarns and well‐established knitting machinery and techniques.
Funder
National Science Foundation
Cited by
2 articles.
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