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Proceedings Paper

Reflectarray for 120-GHz beam steering application: design, simulations, and measurements
Author(s): Aleksi Tamminen; Juha Ala-Laurinaho; David Gomes-Martins; Janne Häkli; Päivi Koivisto; Mikko Kärkkäinen; Sampo Mäkelä; Pekka Pursula; Pekka Rantakari; Markku Sipilä; Jussi Säily; Reijo Tuovinen; Mikko Varonen; Kari A. I. Halonen; Arttu Luukanen; Antti V. Räisänen
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Paper Abstract

Development of a 120-GHz FMCW radar with a reflectarray as focusing element is described. The reflectarray is realized on a 150-mm silicon wafer and it has 3700 phase-modulating elements on it. The phase shifters have four discrete values to cover full phase modulation with 90° steps. The reflectarray element is realized with a conductor-backed coplanar waveguide patch antenna with a phase shifter coupled to it. The required phase modulation for each reflectarray element is determined with an in-house physical optics simulation combined with genetic-algorithm-based optimization. The reflectarrays are developed in two stages. First, preliminary reflectarrays with static phase shifters have been manufactured and tested at 120-GHz antenna measurement range. The static reflectarrays are found to perform as designed in their capability to steer the beam to a desired direction and to a distance of 3 m. The reflectarrays have -3-dB beam width from 1.1° to 1.3° depending on the beam tilt. After the preliminary verification with the static phase shifters, the reflectarrays will be assembled together with actively controlled MEMS-based phase shifters. The MEMS switches are controlled with dedicated high-voltage CMOS electronics, forming a system-in-a-package (SiP). First, the MEMS phase shifters are modeled, are being fabricated, and will be measured separately to verify their phase-shifting capability.

Paper Details

Date Published: 8 May 2012
PDF: 11 pages
Proc. SPIE 8362, Passive and Active Millimeter-Wave Imaging XV, 836205 (8 May 2012); doi: 10.1117/12.924167
Show Author Affiliations
Aleksi Tamminen, Aalto Univ. (Finland)
Juha Ala-Laurinaho, Aalto Univ. (Finland)
David Gomes-Martins, VTT Technical Research Ctr. of Finland (Finland)
Janne Häkli, VTT Technical Research Ctr. of Finland (Finland)
Päivi Koivisto, VTT Technical Research Ctr. of Finland (Finland)
Mikko Kärkkäinen, Aalto Univ. (Finland)
Sampo Mäkelä, Aalto Univ. (Finland)
Pekka Pursula, VTT Technical Research Ctr. of Finland (Finland)
Pekka Rantakari, VTT Technical Research Ctr. of Finland (Finland)
Markku Sipilä, VTT Technical Research Ctr. of Finland (Finland)
Jussi Säily, VTT Technical Research Ctr. of Finland (Finland)
Reijo Tuovinen, VTT Technical Research Ctr. of Finland (Finland)
Mikko Varonen, Aalto Univ. (Finland)
Kari A. I. Halonen, Aalto Univ. (Finland)
Arttu Luukanen, VTT Technical Research Ctr. of Finland (Finland)
Antti V. Räisänen, Aalto Univ. (Finland)

Published in SPIE Proceedings Vol. 8362:
Passive and Active Millimeter-Wave Imaging XV
David A. Wikner; Arttu R. Luukanen, Editor(s)

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