Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 68, Issue 3, Pages 1533-1541Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2019.2957729
Keywords
Beam steering; diffraction; electromagnetic metasurfaces; metagratings; reflector antennas
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As opposed to metasurfaces, metagratings represent themselves sparse arrangements of scatterers. Established rigorous analytical models allow metagratings to overcome performance of metasurfaces in beam steering applications while handling less degrees of freedom. In this article, we deal with reflective metagratings that have only as few as one degree of freedom (represented by a reactively loaded thin wire) per each propagating diffraction order. We present a detailed design procedure and fabrication of three experimental samples capable of establishing prescribed diffraction patterns. The samples are experimentally studied in an anechoic chamber dedicated to radar cross-section bistatic measurements and results are compared with three-dimension full-wave numerical simulations. We identify and analyze factors affecting operating frequency range of metagratings suggest a strategy to increase the bandwidth.
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