A metasurface to focus antenna beam at offset angle

Muhammad U. Afzal, Karu P. Esselle, Ali Lalbakhsh

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

19 Citations (Scopus)


This paper explains the design of a metasurface that tilts and focuses the broadside beam of an ordinary antenna to an offset angle. The design is based on the theory of near-field phase transformation, which has been demonstrated in our previous publications. In the final design, the metasurface is simply stacked above the base antenna within its near-field region - for the purpose of demonstration the base antenna is a classical resonant-cavity antenna (RCA). The metasurface transforms the arbitrary phase distribution of the field, radiated by the RCA, at its input into a linearly increasing phase at its output, thus tilting and focusing the RCA beam. The metasurface is made of spatially distributed printed cells for locally introducing a specific phase shift. With the metasurface, the RCA beam points at a 20° elevation angle and is 8 dB more directive with significantly reduced 3dB beamwidth.

Original languageEnglish
Title of host publication2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC)
Subtitle of host publicationproceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages4
ISBN (Electronic)9789082598735
ISBN (Print)9781538637647
Publication statusPublished - 2018
Event2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018 - Gran Canaria, Spain
Duration: 28 May 20181 Jun 2018


Conference2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018
CityGran Canaria


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