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dc.contributor.authorChou, Hai Chengen_US
dc.contributor.authorTung, Nai-Lunen_US
dc.contributor.authorKehn, Malcolm Ng Mouen_US
dc.date.accessioned2019-04-02T05:57:52Z-
dc.date.available2019-04-02T05:57:52Z-
dc.date.issued2018-09-01en_US
dc.identifier.issn0018-926Xen_US
dc.identifier.urihttp://dx.doi.org/10.1109/TAP.2018.2845550en_US
dc.identifier.urihttp://hdl.handle.net/11536/148112-
dc.description.abstractIn this communication, we study the use of metasurfaces comprising circular metallic patches printed on a grounded dielectric substrate to design and synthesize the double-focus generalized Luneburg lens (DF-GLL) at microwave frequencies. When illuminated by incident plane waves arriving from not just one but numerous azimuth angles, the simulated design displays two clear focal spots toward all directions, thereby exhibiting rotational symmetry which facilitates beam switching and scanning. How such circular patch elements compare with square ones is also investigated in terms of the range over which refractive indices can be synthesized as well as the bandwidths of both focal points produced by DF-GLLs composed of patches bearing those two shapes. When operated as a radiating antenna instead, for which excitation source feeds are placed at the two focal spots aligned along the azimuth angle pertaining to that intended beam direction, strong directivilies toward all directions are achieved as simulated radiation patterns show. A prototype of the design was also manufactured and measurement results agree well with predictions by simulations, particularly in terms of realizing two distinct focal points toward several azimuth directions.en_US
dc.language.isoen_USen_US
dc.subjectDaible-focusen_US
dc.subjectLuneburg lensen_US
dc.subjectmetasurfaceen_US
dc.titleThe Double-Focus Generalized Luneburg Lens Design and Synthesis Using Metasurfacesen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TAP.2018.2845550en_US
dc.identifier.journalIEEE TRANSACTIONS ON ANTENNAS AND PROPAGATIONen_US
dc.citation.volume66en_US
dc.citation.spage4936en_US
dc.citation.epage4941en_US
dc.contributor.department電子工程學系及電子研究所zh_TW
dc.contributor.departmentDepartment of Electronics Engineering and Institute of Electronicsen_US
dc.identifier.wosnumberWOS:000444018400060en_US
dc.citation.woscount0en_US
Appears in Collections:Articles