30 March 2004 2D scanning Rotman lens structure for smart collision avoidance sensors
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Although electronically scanned antenna arrays can provide effective mm-wave search radar sensors, their high cost and complexity are leading to the consideration of alternative beam-forming arrangements. Rotman lenses offer a compact, rugged, reliable, alternative solution. This paper considers the design of a microstrip based Rotman lens for high-resolution, frequency-controlled scanning applications. Its implementation in microstrip is attractive because this technology is low-cost, conformal, and lightweight. A sensor designed for operation at 77 GHz is presented and an ~80° azimuthal scan over a 30 GHz bandwidth is demonstrated.
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Leonard T. Hall, Hedley J. Hansen, Derek Abbott, "2D scanning Rotman lens structure for smart collision avoidance sensors", Proc. SPIE 5274, Microelectronics: Design, Technology, and Packaging, (30 March 2004); doi: 10.1117/12.527948; https://doi.org/10.1117/12.527948

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