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The simplicity and cost factor of millimeter-wave hardware restrict the implementation of near-field radar imaging systems in many applications. These drawbacks are exacerbated when using multiple antennas, each being connected to a dedicated sampling chain. To significantly alleviate these constraints, the use of analog multiplexing techniques appears inevitable. The choice of a suitable solution for a given application can be challenging. Among the available technologies, this study focuses on frequency beamsteering and space-frequency random scanning, comparing the characteristics and performances of these techniques in a radar imaging scenario in the 92-96GHz frequency band.
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Salah Skitioui, Thomas Fromentèze, Ettien Kpré, Christophe Gaquière, Cyril Decroze, "Study of analog multiplexing techniques applied to millimeter wave imaging," Proc. SPIE 12111, Passive and Active Millimeter-Wave Imaging XXV, 121110L (3 June 2022); https://doi.org/10.1117/12.2618632