Abstract

Recently, a frequency-diverse, metamaterial-based aperture has been introduced in the context of microwave and millimeter wave imaging. The generic form of the aperture is that of a parallel plate waveguide, in which complementary metamaterial elements patterned into the upper plate couple energy from the waveguide mode to the scene. To reliably predict the imaging performance of such an aperture prior to fabrication and experiments, it is necessary to have an accurate forward model that predicts radiation from the aperture, a model for scattering from an arbitrary target in the scene, and a set of image reconstruction approaches that allow scene estimation from an arbitrary set of measurements. Here, we introduce a forward model in which the metamaterial elements are approximated as polarizable magnetic dipoles, excited by the fields propagating within the waveguide. The dipoles used in the model can have arbitrarily assigned polarizability characteristics. Alternatively, fields measured from actual metamaterial samples can be decomposed into a set of effective dipole radiators, allowing the performance of actual samples to be quantitatively modeled and compared with simulated apertures. To confirm the validity of our model, we simulate measurements and scene reconstructions with a virtual multiaperture imaging system operating in the K-band spectrum (18–26.5 GHz) and compare its performance with an experimental system.

© 2015 Optical Society of America

Metamaterial microwave holographic imaging system

John Hunt, Jonah Gollub, Tom Driscoll, Guy Lipworth, Alex Mrozack, Matthew S. Reynolds, David J. Brady, and David R. Smith
J. Opt. Soc. Am. A 31(10) 2109-2119 (2014)

Frequency-diverse microwave imaging using planar Mills-Cross cavity apertures

Okan Yurduseven, Jonah N. Gollub, Daniel L. Marks, and David R. Smith
Opt. Express 24(8) 8907-8925 (2016)

Metamaterial apertures for coherent computational imaging on the physical layer

Guy Lipworth, Alex Mrozack, John Hunt, Daniel L. Marks, Tom Driscoll, David Brady, and David R. Smith
J. Opt. Soc. Am. A 30(8) 1603-1612 (2013)

Design considerations for a dynamic metamaterial aperture for computational imaging at microwave frequencies

Timothy Sleasman, Michael Boyarsky, Mohammadreza F. Imani, Jonah N. Gollub, and David R. Smith
J. Opt. Soc. Am. B 33(6) 1098-1111 (2016)

Generalized range migration algorithm for synthetic aperture radar image reconstruction of metasurface antenna measurements

Aaron V. Diebold, Laura Pulido-Mancera, Timothy Sleasman, Michael Boyarsky, Mohammadreza F. Imani, and David R. Smith
J. Opt. Soc. Am. B 34(12) 2610-2623 (2017)