L.-H. YehJEAN-FU KIANG2018-09-102018-09-102014-01https://www.scopus.com/inward/record.uri?eid=2-s2.0-84905669762&doi=10.2528%2fPIERM14061606&partnerID=40&md5=1692b2764b93e8d37a07177c05d90d48A tunable metasurface composed of multiple resonant units is proposed, with each unit containing a block of SrTiO3 ferroelectric and a periodical copper-wire structure. The local transmission coefficient of the metasurface can be controlled by tuning the permittivity of SrTiO3 via a bias voltage. A tunable metasurface is simulated to steer the beam direction at the angles of 30° and 14.47°, respectively. Another one is simulated to focus the wave beam at the focal lengths of 2λ0 and 4λ0, respectively.Strontium titanates; Wire; Beam direction; Copper wires; Focal lengths; Metasurface; Metasurfaces; Microwave tunable; Transmission coefficients; Wave beams; Ferroelectric materialsjournal article10.2528/PIERM140616062-s2.0-84905669762