Ultrawideband Metasurface Lenses Based on Off-Shifted Opposite Layers
2016 (English)In: IEEE Antennas and Wireless Propagation Letters, ISSN 1536-1225, E-ISSN 1548-5757, Vol. 15, 484-487 p.Article in journal (Refereed) PublishedText
Metasurfaces have demonstrated to be a low-cost solution for the development of directive antennas at high frequency. One of the opportunities of metasurfaces is the possibility to produce planar lenses. However, these lenses usually present a narrow band of operation. This limitation on bandwidth is more restrictive when the required range of refractive index is high. Here, we present a novel implementation of metasurfaces with low dispersion that can be employed for the design of ultrawide-band planar lenses. The implementation consists of two mirrored metasurfaces that are displaced exactly a half unit cell. This displacement produces two effects: It increases the equivalent refractive index of the fundamental mode and flattens its frequency dependence.
Place, publisher, year, edition, pages
2016. Vol. 15, 484-487 p.
Luneburg lens, metasurfaces, parallel-plate waveguide, ultrawideband lens
Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
IdentifiersURN: urn:nbn:se:kth:diva-185389DOI: 10.1109/LAWP.2015.2492678ISI: 000372419900010ScopusID: 2-s2.0-84964325564OAI: oai:DiVA.org:kth-185389DiVA: diva2:920484
QC 201604182016-04-182016-04-182016-04-18Bibliographically approved