Gradient Index Metasurface Lens for Microwave Imaging

Datta, Srijan; Tamburrino, Antonello; Удпа, Лалита

doi:10.3390/s22218319

Cited by 6 publications

(2 citation statements)

References 51 publications

(57 reference statements)

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“…In the last two decades, following Veselago's seminal work on the focusing phenomenon of double-negative materials [18], numerous researchers have undertaken investigations into the properties of these materials for various applications [19], including MWI [20][21][22][23][24]. The utilization of an ideal Veselago lens (VL), a loss-less double-negative material with ϵ r = µ r = −1, in quantitative MWI, has been successfully demonstrated in previous research [25].…”

Section: Introductionmentioning

confidence: 99%

Assessing the potential of using a virtual Veselago lens in quantitative microwave imaging

Eini Keleshteri,

Okhmatovski,

Jeffrey

et al. 2024

Inverse Problems

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This study explores the potential of implementing the focusing properties of a virtual ideal Veselago lens within a standard free-space microwave imaging scenario. To achieve this, the virtual lens is introduced as an inhomogeneous numerical background for the inverse source problem. This numerical Vesealgo lens is incorporated into the incident and scattered field decomposition, resulting in a new data equation that involves the Veselago Lens Green's function. In addition to the contrast sources within the object-of-interest, the lens introduces virtual contrast sources along the lens boundaries that depend on the total tangential magnetic field. It is shown that a surface integral contribution that takes into account these surface contrast sources must be added to the collected free-space data before one can invert using the well-conditioned Veselago lens inversion operator. A preliminary investigation of the accuracy to which this surface integral contribution must be computed is performed using additive Gaussian noise. Results show that an error of less than one percent is required to achieve imaging performance similar to utilizing an actual Veselago lens. All results are performed within a 2D simulation environment.

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Section: Introductionmentioning

confidence: 99%

Assessing the potential of using a virtual Veselago lens in quantitative microwave imaging

Eini Keleshteri,

Okhmatovski,

Jeffrey

et al. 2024

Inverse Problems

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“…Lenses can focus incoming electromagnetic (EM) waves during transmission and reception [1]. The dielectric lens antenna uses its curved surface to focus/concentrate the RF energy.…”

mentioning

confidence: 99%

Optimal Dimensions and Performance Evaluation of a Truncated Spherical Dielectric Lens Antenna at X-Band Frequencies

Ali,

Ahsan,

Khairi

et al. 2024

Preprint

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This study presents the design and development of a truncated spherical dielec-tric lens antenna. The objective was to enhance and optimize the directivity and beamwidth of the feed antenna by adjusting the feed position around the focal point of the lens. Polyetrafluoroethylene (PTFE), with a dielectric constant of 2.1, was chosen as the lens medium. Simulations were conducted using CST Studio Suite over a frequency range of 8 to 12 GHz. Experimental validation was performed using a vector network analyzer (VNA) and an anechoic chamber. The optimized dimensions of the dielectric lens antenna were determined as follows: lens thickness (T) = 24.34 mm, center of curvature (R) = 55 mm, and lens aperture (L) = 110 mm. This configuration achieved a directivity of 21.9 dBi and a beamwidth of 13.1°. The resulting dielectric lens antenna exhibits a compact size, simple geometric shape, and ease of design and construction. These characteristics make it highly suitable for RF applications, particularly when energy concentration is required.

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