Reflectarray for 120-GHz beam steering application: design, simulations, and measurements

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

doi:10.1117/12.924167

8 May 2012 Reflectarray for 120-GHz beam steering application: design, simulations, and measurements

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

Author Affiliations +

Proceedings Volume 8362, Passive and Active Millimeter-Wave Imaging XV; 836205 (2012) https://doi.org/10.1117/12.924167
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

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.

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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, and Antti V. Räisänen "Reflectarray for 120-GHz beam steering application: design, simulations, and measurements", Proc. SPIE 8362, Passive and Active Millimeter-Wave Imaging XV, 836205 (8 May 2012); https://doi.org/10.1117/12.924167

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