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Generating Information-Diverse Microwave Speckle Patterns Inside a Room at a Single Frequency With a Dynamic Metasurface Aperture

Mizrahi, Oren S. and Imani, Mohammadreza F. and Gollub, Jonah N. and Smith, David R. (2020) Generating Information-Diverse Microwave Speckle Patterns Inside a Room at a Single Frequency With a Dynamic Metasurface Aperture. IEEE Access, 8 . pp. 36829-36835. ISSN 2169-3536. doi:10.1109/access.2020.2974441.

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We demonstrate that dynamic metasurface apertures (DMAs) are capable of generating a multitude of highly uncorrelated speckle patterns in a typical residential environment at a single frequency. We use a DMA implemented as an electrically-large cavity excited by a single port and loaded with many individually-addressable tunable metamaterial radiators. We placed such a DMA in one corner of a plywood-walled L-shape room transmitting microwave signals at 19 GHz as we changed the tuning states of the metamaterial radiators. In another corner, in the non-line-of-sight of the DMA, we conducted a scan of the field generated by the DMA. For comparison, we also performed a similar test where the DMA was replaced by a simple dipole antenna with fixed pattern but generating a signal that spanned 19-24 GHz. Using singular value decomposition of the scanned data, we demonstrate that the DMA can generate a multitude of highly uncorrelated speckle patterns at a single frequency. In contrast, a dipole antenna with a fixed pattern can only generate such a highly uncorrelated set of patterns when operating over a large bandwidth. The experimental results of this paper suggest that DMAs can be used to capture a diversity of information at a single frequency which can be used for single frequency computational imaging systems, NLOS motion detection, gesture recognition systems, and more.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mizrahi, Oren S.0000-0003-4271-8822
Imani, Mohammadreza F.0000-0003-2619-6358
Gollub, Jonah N.0000-0002-3941-1478
Smith, David R.0000-0002-4832-6208
Additional Information:© 2020 IEEE. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see Received January 31, 2020, accepted February 13, 2020, date of publication February 17, 2020, date of current version March 2, 2020. The information, data, or work presented herein was funded in part by the Advanced Research Projects Agency-Energy (ARPA-E), US Department of Energy, under Award Number DE-AR0000937. This work was completed when O.S.M. was with the Center for Metamaterials and Integrated Plasmonics, Duke University.
Funding AgencyGrant Number
Advanced Research Projects Agency-Energy (ARPA-E)DE-AR0000937
Subject Keywords:Antenna radiation patterns, radio frequency, sensors, antenna arrays, metamaterials
Record Number:CaltechAUTHORS:20200220-160137658
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Official Citation:O. S. Mizrahi, M. F. Imani, J. N. Gollub and D. R. Smith, "Generating Information-Diverse Microwave Speckle Patterns Inside a Room at a Single Frequency With a Dynamic Metasurface Aperture," in IEEE Access, vol. 8, pp. 36829-36835, 2020. doi: 10.1109/ACCESS.2020.2974441
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101439
Deposited By: Tony Diaz
Deposited On:21 Feb 2020 00:12
Last Modified:16 Nov 2021 18:02

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