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Bespoke Lenses Based on Quasi-Conformal Transformation Optics Technique
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-4900-4788
2017 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 1558-2221, Vol. 65, no 5, 2256-2264 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, a systematic method to design a quasioptimum lens profile based on quasi-conformal transformation optics technique for a given excitation is presented. This method is applied to a number of conventional antennas, such as an aperture and a log-spiral slot. In all these configurations, an increase of the directivity is observed. Furthermore, using this method, a quasi-optimum graded index lens for a broadband enhanced leaky slot excitation is designed and the results are compared with a hyperhemispherical lens with and without matching layers. Our proposed methodology demonstrates to be able to increase the directivity, to reduce the sidelobes and the cross polarization in a broad bandwidth from 20 to 70 GHz. Due to the continuously changed dielectric constant of the lens profile, reflections are also reduced considerably inside the lens.

Place, publisher, year, edition, pages
IEEE, 2017. Vol. 65, no 5, 2256-2264 p.
Keyword [en]
Graded index (GRIN) lenses, lens antennas, quasi-conformal transformation optics (QCTO)
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Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-207892DOI: 10.1109/TAP.2017.2679494ISI: 000400922600014ScopusID: 2-s2.0-85018860865OAI: oai:DiVA.org:kth-207892DiVA: diva2:1103697
Note

QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved

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Ebrahimpouri, MahsaQuevedo-Teruel, Oscar
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