Passive Metasurface Antenna with Perfect Aperture Efficiency

Budhu, Jordan; Grbic, Anthony

doi:10.1109/metamaterials52332.2021.9577163

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…2 allows us to predict and engineer the radiation pattern of the MTS using a modified version of the well known VSIE framework [60] originally proposed to model mixed conductive and dielectric structures. It was recently adopted to design metasurface antennas [39]- [41], [47]- [51]. For completeness, this approach is reviewed here, along with some of our proposed augmentations.…”

Section: B Volume-surface Integral Equations Formulationmentioning

confidence: 99%

“…In contrast to holographic modulated impedance MTSs, these devices are capable of truly arbitrary beam-forming, since they do not assume any functional form for the aperture fields. In particular, some of the aforementioned designs [39], [41] leverage a single electric impedance MTS backed by a ground plane, meaning they are easier to fabricate and can be less lossy than other implementations that rely on multilayer transmissive HMSs. Their exceptional beam-forming capability can be explained by the fact that the ground plane shorts out the contribution of the effective electric currents to the far-field.…”

mentioning

confidence: 99%

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Extreme Beam-Forming With Impedance Metasurfaces Featuring Embedded Sources and Auxiliary Surface Wave Optimization

Ataloglou

Hum

et al. 2022

IEEE Access

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We present the end-to-end design of compact passive and lossless metasurface antennas with integrated feeds. The complete low-profile system consists of a single-layered reactive impedance metasurface on top of a grounded dielectric substrate, and is fed by sources which are embedded inside the substrate. The top impedance layer is implemented with an array of printed metallic wires, each of which is periodically loaded with subwavelength reactive elements (e.g. printed capacitors). An accurate and efficient volumesurface integral equation-based model of the device is developed, and used as the basis for the rapid optimization of the wire impedances, with the goal of producing the desired radiation characteristics. It is found that the optimized designs leverage tailored surface waves to facilitate the realization of extreme field transformations. In particular, we present surfaces capable of wide-angle beamforming up to 60 • offbroadside with nearly 100% aperture efficiency. We also demonstrate a multi-input, multi-output, antenna with two embedded sources emitting independent beams at ±20 • . The output beams each exhibits an aperture efficiency of around 90%, despite sharing the same physical aperture. Our design framework is supplemented by several feasibility-related constraints, which can significantly enhance the power efficiency as well as the bandwidth of the metasurface antennas when they are implemented in practice. Utilizing these constraints, a Chebyshev pattern antenna with a side lobe level of −20 dB is designed with realistic loaded wires and validated with full-wave simulations. The obtained radiation pattern confirms the ability of the developed framework for arbitrary beam-shaping. The realized power efficiency (limited by copper and dielectric losses) is over 93% and the 3-dB directivity bandwidth slightly over 6%.

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Section: B Volume-surface Integral Equations Formulationmentioning

confidence: 99%

mentioning

confidence: 99%

Extreme Beam-Forming With Impedance Metasurfaces Featuring Embedded Sources and Auxiliary Surface Wave Optimization

Ataloglou

Hum

et al. 2022

IEEE Access

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“…) where the operator '𝑇' denotes matrix transpose. The polarizabilities of each of the particles presented in this subsection will adhere to (53). We begin with the reciprocal Omega particle.…”

Section: A Reciprocal Magnetoelectric Particlesmentioning

confidence: 99%

“…Another application of metasurfaces is in enhanced antenna design. For example, in [53], [111], [112], a metasurface antenna is designed to achieve perfect (100%) aperture efficiency. In [49], the metasurface antenna consists of a patterned metallic cladding supported by a grounded dielectric substrate and fed by an infinite electric line source placed within the substrate, as seen in Fig.…”

Section: H Perfect Antennasmentioning

confidence: 99%

“…Over the past year, nonlocal designs that are passive and lossless have been reported that overcome the local power conservation restriction of earlier designs. These boundaries require only global power conservation to ensure passivity but allow perfect field transformation [33], [38], [39], [42]- [53] or perfect mode conversion [54]- [57]. These passive and lossless designs truly allow unrestricted reciprocal and lossless field transformations.…”

Section: Introductionmentioning

confidence: 99%

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A Rigorous Approach to Designing Reflectarrays

Budhu

Grbic

2019

2019 23rd International Conference on Applied Electromagnetics and Communications (ICECOM)

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In recent years, new functionality and unprecedented wavefront control has been enabled by the introduction of bianisotropic metasurfaces. A bianisotropic metasurface is characterized by an electric response, a magnetic response, and an electro-magnetic/magneto-electric response. In general, these metasurfaces consists of an array of metallic or dielectric particles located within a subwavelength thick host medium, and are approximated and modelled as infinitely-thin, idealized sheet boundaries defined along a surface. An appropriate sheet boundary condition which effectively models the tangential field discontinuity due to the array of magnetoelectric inclusions is the Generalized Sheet Transition Condition or GSTC. Several forms of the GSTC appear in literature. Here, we present each interpretation and show how they are related. Synthesis approaches unique to each form are overviewed. By utilizing the GSTC in metasurface design, new possibilities emerge which are not possible with conventional design techniques incorporating only electric or only magnetic responses. Since the metasurfaces are designed using bianisotropic boundary conditions, they must be realized using particles which contain magnetoelectric responses. This review article discusses the design of metasurfaces using the GSTC, and the bianisotropic particles used to realize GSTC's. Further, it discusses new and recent applications that have emerged due to bianisotropy, and future prospects in metasurface design using bianisotropic boundary conditions. The intent is to provide a comprehensive overview of metasurface design involving bianisotropy and for this review article to serve as a starting point for engineers and scientist that wish to introduce bianisotropy into metasurface design.

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