4.6 Article

A Compact Multibeam Folded Transmitarray Antenna at Ku-Band

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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2021.3064217

关键词

Antenna feeds; Transmitting antennas; Reflector antennas; Antenna radiation patterns; Metasurfaces; Lenses; Substrates; Bifocal principle; folded reflectarray antenna (FRA); folded transmitarray antenna (FTA); multibeam

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The letter presents a low-profile multibeam fully planar folded transmitarray antenna (FTA) based on the bifocal principle, which achieves high transmission efficiency and 3 b compensation phases. A new technique is proposed to improve the isolations among the feeding antennas, utilizing the multiplicity of the elements. Experimental results of a Ku-band multibeam FTA show a peak gain of 22.7 dBi and a scanning range of +/- 21 degrees, with a maximum feed isolation of 24 dB.
Multibeam antennas have found more and more applications in current and future communication systems. In this letter, a low-profile multibeam fully planar folded transmitarray antenna (FTA) based on the bifocal principle is proposed. It consists of a reflectarray, a transmitarray, and a group of identical planar feeding antennas. The transmitarray is developed with the metasurface and achieves high transmission efficiency and 3 b compensation phases. A new technique is proposed to improve the isolations among the feeding antennas by taking advantage of the multiplicity of the feeding elements. As an example, a multibeam FTA operating at the Ku-band was designed, fabricated, and tested. Experimental results achieve a peak gain of 22.7 dBi and a scanning range of +/- 21 degrees, with a maximum feed isolation of 24 dB.

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