Printed Aperiodic Cavity for Computational and Microwave Imaging

Yurduseven, Okan; Gowda, Vinay R.; Gollub, Jonah N.; Smith, David R.

doi:10.1109/lmwc.2016.2548443

Cited by 101 publications

(56 citation statements)

References 11 publications

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“…According to Reference [9], in order to reduce the mutual coherences, an interesting option is to construct the modes as independent and identically distributed as random variables. Thus various antenna structures have been proposed for MCI by intuitively randomizing resonant cavity structures or element resonant properties, such as mode-mixing cavity [10], printed aperiodic cavity with irises distributed in a Fibonacci pattern [11], disordered cavity with dynamically tuneable impedance source [12] and printed metasurface with subwavelength metallic cylinders in the cavity [13]. These antennas have shown that the mutual coherences in the measurement matrix can be effectively reduced by introducing disorder and randomness in the antenna structures.…”

Section: Introductionmentioning

confidence: 99%

On the Coherence Relationship between Measurement Matrices and Equivalent Radiation Sources in Microwave Computational Imaging Applications

Guan

Chen

2019

Applied Sciences

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In recent years, computational imaging, which encodes scene information into a set of measurements, has become a research focus in the field of microwave imaging. As with other typical inverse problems, the key challenge is to reduce the mutual coherences in the measurement matrix which is composed of measurement modes. Since the modes are synthesized by antennas, there is a great deal of interest in the antenna optimization for the reduction. The mechanism underlying the generation of the coherences is critical for the optimization; however, relevant research is still inadequate. In this paper, we try to address the research gap by relating the coherences to the antennas’ equivalent radiation sources via spectral Green’s dyad. We demonstrate that the coherences in the measurement matrix are dependent on the spatial spectral coherences of the sources, while in this relationship the imaging scenario acts as a spectral low-pass filter. Increasing the imaging range narrows the spectral constraint, which eventually increases the coherences in the measurement matrix. Full-wave electromagnetic simulations are performed for validation. We hope that our work provides a possible direction for the antenna optimization in microwave computational imaging (MCI) applications and motivates further research in this field.

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Section: Introductionmentioning

confidence: 99%

On the Coherence Relationship between Measurement Matrices and Equivalent Radiation Sources in Microwave Computational Imaging Applications

Guan

Chen

2019

Applied Sciences

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“…Various works have recently investigated the effects of spatial sampling in array imaging and the potential of using sparse elements with aperiodic arrangements [10], [52]. Our physical aperture is electrically-large and therefore is not necessarily subject to the usual λ/2 sampling rate, but the aperture is filled inhomogeneously with fields falling off as the distance from the center increases.…”

Section: B Spatial Samplingmentioning

confidence: 99%

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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“…In Kang et al [6], a ground-folded slot antenna was proposed to enhance the gain and reduce the backward radiation of a microwave image. In Yurduseven et al [7], a frequency-diverse aperture was proposed…”

Section: Introductionmentioning

confidence: 99%

Food Security Sensing System Using a Waveguide Antenna Microwave Imaging through an Example of an Egg

Tai

Hung

et al. 2020

Sensors

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In this paper, we present a form of food security sensing using a waveguide antenna microwave imaging system through an example of an egg. A waveguide antenna system with a frequency range of 7–13 GHz and a maximum gain of 17.37 dBi was proposed. The maximum scanning area of the waveguide antenna microwave imaging sensing system is 30 × 30 cm2. In order to study the resolution and sensitivity of the waveguide antenna microwave imaging sensing system, the circular and triangular high-k materials (with the same thickness but with different dielectric constants of the materials) were used as the testing sample for observing the microwave images. By using the proposed waveguide antenna microwave imaging sensing system, the high-k materials with different dielectric constants and shapes could be easily sensed. Therefore, the waveguide antenna microwave imaging sensing system could be potentially used for applications in rapid, non-destructive food security sensing. Regarding the example of an egg, the proposed waveguide antenna microwave imaging sensing system could effectively identify the health status of many eggs very quickly. The proposed waveguide antenna microwave imaging sensing system provides a simple, non-destructive, effective, and rapid method for food security applications.

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Printed Aperiodic Cavity for Computational and Microwave Imaging

Cited by 101 publications

References 11 publications

On the Coherence Relationship between Measurement Matrices and Equivalent Radiation Sources in Microwave Computational Imaging Applications

On the Coherence Relationship between Measurement Matrices and Equivalent Radiation Sources in Microwave Computational Imaging Applications

Experimental Synthetic Aperture Radar With Dynamic Metasurfaces

Food Security Sensing System Using a Waveguide Antenna Microwave Imaging through an Example of an Egg

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