A 60 GHz code-modulated interferometric imaging system using a phased array

Vikas Chauhan; Haekyo Seo; Kevin Greene; Dong Gun Kam; Brian Floyd

doi:10.1117/12.2565589

23 April 2020 A 60 GHz code-modulated interferometric imaging system using a phased array

Vikas Chauhan, Haekyo Seo, Kevin Greene, Dong Gun Kam, Brian Floyd

Proceedings Volume 11411, Passive and Active Millimeter-Wave Imaging XXIII; 1141104 (2020) https://doi.org/10.1117/12.2565589
Event: SPIE Defense + Commercial Sensing, 2020, Online Only

Abstract

This paper presents a millimeter-wave code-modulated interferometric imaging system, which is a lens-less approach to realizing imagers using repurposed phased arrays. To use a phased array as an interferometer, incoming signals are code modulated using phase shifters, multiplexed using a power combiner, and processed through a shared receiver chain. An interference pattern is then obtained by a squaring operation, from which complex visibilities can be demodulated. Here, a four-element 60-GHz phased array chip is packaged with slot antennas, and a single 60-GHz output is measured using a power detector. This scalar measurement is then demodulated to obtain the interferometric visibilities. The four-element phased array is thinned to obtain a 13-pixel image and the system is demonstrated through a point-source detected at different locations.

Citation Download Citation

Vikas Chauhan, Haekyo Seo, Kevin Greene, Dong Gun Kam, and Brian Floyd "A 60 GHz code-modulated interferometric imaging system using a phased array", Proc. SPIE 11411, Passive and Active Millimeter-Wave Imaging XXIII, 1141104 (23 April 2020); https://doi.org/10.1117/12.2565589

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