Broadband cloaking of selected objects in the microwave regime with a volumetric cloak comprising layered networks of transmission lines

Alitalo, Pekka; Luukkonen, Olli; Bongard, F.; Zürcher, J. F.; Mosig, J. R.; Tretyakov, Sergei

doi:10.1109/aps.2009.5171859

Cited by 7 publications

(10 citation statements)

References 7 publications

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“…The experiments and the transmission measurements for the empty waveguide and the TL and MP cloaks shown in Fig. 1a,b have been already reported, 10,11,14 demonstrating good transmission properties around 3 GHz. Here we compare these experimental results with the numerical results obtained for the CT cloak of the same dimension.…”

Section: Measured and Simulated Transmission Datamentioning

confidence: 56%

“…Although the cloaked object in this case is a two-dimensional array of metal rods, it should be noted that with the same cloak also a more complicated three-dimensional object can be cloaked. 8,11,12…”

Section: A Transmission-line Cloakmentioning

confidence: 99%

“…We study three cloaking methods: The coordinate-transformation (CT) cloak, 5,6 the transmission-line (TL) cloak, [9][10][11][12] and the metal-plate (MP) cloak. 13,14 Due to the moderate dispersion in the TL and MP cloaks, we expect that the cloaking bandwidth is wider and pulse distortion is mitigated in these cloaks, as compared to the CT cloak.…”

Section: Introductionmentioning

confidence: 99%

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Cloaking a metal object from an electromagnetic pulse: A comparison between various cloaking techniques

Alitalo

Kettunen

Tretyakov

2010

Journal of Applied Physics

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Electromagnetic cloaks are devices that can be used to reduce the total scattering cross section of various objects. An ideal cloak removes all scattering from an object and thus makes this object "invisible" to the electromagnetic fields that impinge on the object. However, ideal cloaking appears to be possible only at a single frequency. To study cloaking from an electromagnetic pulse, we consider propagation of a pulse inside a waveguide with a cloaked metal object inside. There are several ways to achieve cloaking, and in this paper, we study three such methods, namely, the coordinate-transformation cloak, the transmission-line cloak, and the metal-plate cloak. In the case of the two last cloaks, pulse propagation is studied using experimental data, whereas the coordinate-transformation cloak is studied with numerical simulations. The results show that, at least in the studied cases where the cloaked object's diameter is smaller than the wavelength, the cloaks based on transmission-line meshes and metal plates have wider bandwidth than the coordinate-transformation cloak and are thus more efficient in hiding objects from electromagnetic pulses.

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Section: Measured and Simulated Transmission Datamentioning

confidence: 56%

Section: A Transmission-line Cloakmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cloaking a metal object from an electromagnetic pulse: A comparison between various cloaking techniques

Alitalo

Kettunen

Tretyakov

2010

Journal of Applied Physics

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“…These models are based on the networks of metamaterial waveguides, which control propagation of the electromagnetic signals within a given 3D volume. Examples of this approach may be found in couple of recent experimental realizations of electromagnetic cloaking [4,5]. The goal of our paper is to demonstrate that the latter approach to "optical space" design with metamaterials is also very powerful, and it may supplement the more common approach of continuous engineering of ε ι k and μik tensors.…”

mentioning

confidence: 99%

“…In fact, similar technique is also applicable to lattice models of other higher dimensional D>4 spaces, since higher dimensional lattices can be projected onto 3D space in a similar manner [7]. However, we must emphasize that the lattice models used in such applications as cloaking must be large enough to emulate "continuous" space [4,5].…”

mentioning

confidence: 99%

Lattice models of nontrivial “optical spaces” based on metamaterial waveguides

Smolyaninov

Smolyaninov²

2011

Opt. Lett.

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Received Month X, XXXX; revised Month X, XXXX; accepted Month X, XXXX; posted Month X, XXXX (Doc. ID XXXXX); published Month X, XXXX Metamaterials are being used to model various exotic "optical spaces" for such applications as novel lenses and cloaking. While most effort is directed towards engineering of continuously changing dielectric permittivity and magnetic permeability tensors, an alternative approach may be based on lattices of metamaterial waveguides. Here we demonstrate the power of the latter technique by presenting metamaterial lattice models of various 4D spaces.OCIS Codes: 160.3918 Electromagnetic metamaterials can be used to emulate highly unusual "optical spaces" enabling such applications as novel transformation optics (TO) based lenses and cloaking [1][2][3]. This development is enabled by the newfound freedom of continuous control of the local dielectric permittivity εik and magnetic permeability μik tensors in electromagnetic metamaterials. Even though less prominent, another direction in metamaterial research may be characterized as "lattice-based metamaterial models". These models are based on the networks of metamaterial waveguides, which control propagation of the electromagnetic signals within a given 3D volume. Examples of this approach may be found in couple of recent experimental realizations of electromagnetic cloaking [4,5]. The goal of our paper is to demonstrate that the latter approach to "optical space" design with metamaterials is also very powerful, and it may supplement the more common approach of continuous engineering of ε ι k and μik tensors. For example, lattice-based metamaterial designs allow straightforward realization of various non-Euclidean "optical spaces", which were suggested as a pathway to broadband cloaking [6]. We demonstrate the ultimate power of lattice-based approach by presenting metamaterial lattice models of various hypercubic 4D spaces, which are impossible to emulate using conventional transformation optics. While our claim may seem unusual, we must point out that "hypercubic network architectures" for multiprocessor computing are being widely described in computer engineering literature. It is well known that hypercubic lattice networks of any spatial dimension D can be projected onto 3D space. Moreover, many of these hypercubic networks had been realized in the experiment [7]. An obvious advantage of implementing a lattice-based 4D metamaterial "optical hyperspace" is that any 3D nonEuclidean space may easily fit into such 4D space [8]. Therefore, a natural platform for the proposed nonEuclidean broadband TO designs will be provided.The simplest model of a 4D lattice projected onto regular 3D space is presented in Fig.1, which shows a perspective projection of an elementary unit of a 4D hypercubic spatial lattice, and a perspective projection of 2x2x2x2 region of the hypercubic lattice onto a region of 3D space. The elementary unit is filled with metal, except for the black lines, which represent pieces of thin single mode coaxial waveguides, wh...

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Mantle cloaking for decoupling of interleaved phased antenna arrays in 5G applications

Pawar¹,

Bernety²,

Skinner³

et al. 2020

INTERNATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF COMBUSTION AND PROCESSES IN EXTREME ENVIRONMENTS (COMPHYSCHEM’20-21) and V

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Broadband cloaking of selected objects in the microwave regime with a volumetric cloak comprising layered networks of transmission lines

Cited by 7 publications

References 7 publications

Cloaking a metal object from an electromagnetic pulse: A comparison between various cloaking techniques

Cloaking a metal object from an electromagnetic pulse: A comparison between various cloaking techniques

Lattice models of nontrivial “optical spaces” based on metamaterial waveguides

Mantle cloaking for decoupling of interleaved phased antenna arrays in 5G applications

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