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Dual-polarized square-shaped offset-fed reflectarray antenna with high gain and high bandwidth in the 60 GHz domain

: Visentin, T.; Keusgen, W.; Weiler, R.

European Association on Antennas and Propagation -EurAAP-; Institute of Electrical and Electronics Engineers -IEEE-:
9th European Conference on Antennas and Propagation, EuCAP 2015. Vol.2 : Lisbon, Portugal, 13 - 17 April 2015
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4799-7051-3
ISBN: 978-88-907018-5-6
European Conference on Antennas and Propagation (EuCAP) <9, 2015, Lisbon>
Fraunhofer HHI ()

This paper presents the design, fabrication, simulation and measurement of a compact dual-polarized, high gain and high bandwidth offset-fed reflectarray antenna operating at 60GHz. The square-shaped reflectarray antenna focusses two wide feed antenna beams with orthogonal linear polarizations into one narrow and dual-polarized main beam. At first, the design procedure is described. This includes the choice of a convenient double-layer unit cell comprising variable-sized crossed dipoles, the aperture efficiency optimization and the transfer of the needed progressive phase distribution to the scattering elements. Next, 3-D full-wave computer simulation results demonstrate the feasibility of the design. Promising nearfield measurement results of a fabricated reflectarray antenna validate the concept and show a high bandwidth of 8GHz and a high gain of more than 33 dBi.