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

Sleasman, Timothy; Boyarsky, Michael; Imani, Mohammadreza F.; Gollub, Jonah N.; Smith, David R.

doi:10.1364/josab.33.001098

Cited by 109 publications

(71 citation statements)

References 41 publications

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“…Historically, SAR has been employed from aircraft and satellite systems but the technique has increasingly been applied in cases where the standoff distance is significantly shorter. Holographic imaging systems [32], [56] for security screening [6], [8], [9], [30], [31] and feature-specific imaging [57], [58] are of increasing interest and the dynamic metasurface aperture is posed to make important contributions across the entire field of microwave sensing. …”

Section: Discussionmentioning

confidence: 99%

“…Evidently, the ideal cross-range resolution is in excellent agreement with the experimental ones obtained using spotlight and diverse pattern stripmap. There is noticeable discrepancy in the range result however; this is due to the unleveled power spectrum emitted from the metasurface antenna, which has higher radiated power at lower frequencies [31].…”

Section: Comparisons With Diverse Pattern Stripmapmentioning

confidence: 97%

“…While it seems fair that the diverse pattern case uses a similar number of measurements (i.e. 11 masks), we know that the aperture can image with fewer measurements in this modality [25], [31]. As such, we use a new set of 3 masks at each z position.…”

Section: Crosswise-motional Imagingmentioning

confidence: 99%

“…For this purpose, we take advantage of the dynamic metasurface presented in [31], which is shown in Fig. 2.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental Synthetic Aperture Radar With Dynamic Metasurfaces

Sleasman

Boyarsky

Pulido-Mancera

et al. 2017

IEEE Trans. Antennas Propagat.

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Abstract-We investigate the use of a dynamic metasurface as the transmitting antenna for a synthetic aperture radar (SAR) imaging system. The dynamic metasurface consists of a onedimensional microstrip waveguide with complementary electric resonator (cELC) elements patterned into the upper conductor. Integrated into each of the cELCs are two diodes that can be used to shift each cELC resonance out of band with an applied voltage. The aperture is designed to operate at K band frequencies (17.5 to 20.3 GHz), with a bandwidth of 2.8 GHz. We experimentally demonstrate imaging with a fabricated metasurface aperture using existing SAR modalities, showing image quality comparable to traditional antennas. The agility of this aperture allows it to operate in spotlight and stripmap SAR modes, as well as in a third modality inspired by computational imaging strategies. We describe its operation in detail, demonstrate high-quality imaging in both 2D and 3D, and examine various trade-offs governing the integration of dynamic metasurfaces in future SAR imaging platforms.

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Section: Discussionmentioning

confidence: 99%

Section: Comparisons With Diverse Pattern Stripmapmentioning

confidence: 97%

Section: Crosswise-motional Imagingmentioning

confidence: 99%

“…For this purpose, we take advantage of the dynamic metasurface presented in [31], which is shown in Fig. 2.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Synthetic Aperture Radar With Dynamic Metasurfaces

Sleasman

Boyarsky

Pulido-Mancera

et al. 2017

IEEE Trans. Antennas Propagat.

Self Cite

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“…These measurement modes are composed of radiated field patterns of the metamaterial aperture antenna (MAA) at different frequencies. For image reconstruction schemes, which use an arbitrary set of measurement modes, it is essential that the modes are as orthogonal to each other as possible [4] so that the correlation of the modes or field patterns is small [5][6][7]. Since the measurement modes are indexed by frequency, the low correlation of field patterns can be interpreted as far-field patterns with strong frequency diversity.…”

Section: Introductionmentioning

confidence: 99%

Measurement Matrix Analysis and Radiation Improvement of a Metamaterial Aperture Antenna for Coherent Computational Imaging

Kou

Tian

et al. 2017

Applied Sciences

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Abstract:A metamaterial aperture antenna (MAA) that generates frequency-diverse radiation field patterns has been introduced in the context of microwave wave imaging to perform compressive image reconstruction. This paper presents a new metamateriapl aperture design, which includes two kinds of metamaterial elements with random distribution. One is a high-Q resonant element whose resonant frequency is agile, and the other one is a low-Q element that has a high radiation efficiency across frequency band. Numerical simulations and measurements show that the radiation efficiency of up to 60% can be achieved for the MAA and the far-field patterns owns good orthogonality, when using the complementary electric-field-coupled (CELC) element and the complementary Jerusalem cross (CJC) element with a random distribution ratio of 4 to 1, which could be effectively used to reconstruct the target scattering scene.

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An End‐Fed Programmable Metasurface Based on Substrate Integrated Waveguide for Novel Phased Array

et al. 2023

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A programmable metasurface antenna based on electrically tunable elements operating in 5G millimeter‐wave band, which has the features of low cost, easy manufacturing, low profile, easy integration with planar circuits, is proposed herein. The prototype consists of a 128‐element metasurface array, an 8‐channel beamforming chip as equal amplitude power divider networks, and a control network. Elements mounted with varactors to realize different states are controlled by DC bias signal from the back of a printed circuit board (PCB). By assigning different voltage values, array coding can be dynamically changed, thereby realizing beam steering. Both element dimensions and its location along substrate integrated waveguide (SIW) are optimized to better antenna performance. Experiment results show that the proposed metasurface can achieve not only the scanning range of ±70° for unidirectional beam in azimuth and ±40° in elevation but also ±50° for dual beam in azimuth. The whole prototype is fabricated based on PCB technologies, and good agreements among simulated and measured results are obtained. The proposed electrically tunable metasurface array is a good alternative to the traditional expensive phased array and has a great potential application prospect in radar and communication systems.

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

Cited by 109 publications

References 41 publications

Experimental Synthetic Aperture Radar With Dynamic Metasurfaces

Experimental Synthetic Aperture Radar With Dynamic Metasurfaces

Measurement Matrix Analysis and Radiation Improvement of a Metamaterial Aperture Antenna for Coherent Computational Imaging

An End‐Fed Programmable Metasurface Based on Substrate Integrated Waveguide for Novel Phased Array

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