Utilization of Anisotropic Metamaterial Layers in Waveguide Miniaturization and Transitions

Özgün, Özlem; Kuzuoğlu, Mustafa

doi:10.1109/lmwc.2007.908039

Cited by 58 publications

(31 citation statements)

References 8 publications

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“…3 shows the scattering from the same geometry except that the metamaterial shell has ½Λ ðρ;ϕÞ with negative Δ ρ as computed from Eq. (9). Note that, although the frontal reflection is still strongly suppressed at first, Fig.…”

Section: B Simulations and Backscattering Resultsmentioning

confidence: 84%

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Impedance-matched absorbers and optical pseudo black holes

2011

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We investigate the design of metamaterial blueprints for impedance-matched (reflectionless) absorbers over nonplanar surfaces in connection with optical pseudo black holes. The presence of some fundamental constraints on the existence of reflectionless absorber media at nonplanar surfaces are discussed based on analytical properties of the associated constitutive tensors on the complex ω (angular frequency) plane. In view of such constraints, some new metamaterial blueprints of near-reflectionless absorbers are suggested for integration into optical pseudo black hole devices.

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Section: B Simulations and Backscattering Resultsmentioning

confidence: 84%

“…Media derived from transformation optics typically have inhomogeneous and anisotropic permittivity ½ϵ and permeability ½μ tensors [6][7][8][9][10]. In contrast, most previously proposed media for optical black holes consisted of nonmagnetic isotropic media [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Impedance-matched absorbers and optical pseudo black holes

2011

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“…We hasten to point out, however, that this type of performance is perfectly well suited for modern radar systems, symbolically depicted in Figure 13, where only the scattering in the reflection region is of concern [36][37][38].…”

Section: Rcs Reduction For Practical Targets By Using a Modification mentioning

confidence: 99%

DESIGN OF ABSORPTIVE COATINGS FOR ARBITRARILY SHAPED TARGETS FOR REDUCTION OF RADAR CROSS SECTION (RCS) USING AN ALTERNATIVE TO THE TRANSFORMATION OPTICS (TO) ALGORITHM (Invited Paper)

Mittra¹,

Zhou²

2014

PIER

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Abstract-In this paper we present an alternative approach to addressing the problem of scattering reduction for radar targets, which have recently been dealt with by using the Transformation Optics (TO) algorithm which typically calls for the use of Metamaterials (MTMs) that are inherently narrowband, dispersive and highly sensitive to polarization as well as to the incident angle. The present design utilizes realistic lossy materials that can be conveniently fabricated in the laboratory, and are wideband as well as relatively insensitive to polarization and incident angle of the incoming wave. A modified interpretation of the TO algorithm is presented and is employed the design of RCS-reducing absorbers for arbitrarily shaped targets, and not just for canonical shapes, e.g., cylinders, for which cloaks have been designed by using the TO. The paper also briefly examines the topic of performance enhancement of absorbers by using graphene materials and embedded Frequency Structure Surfaces (FSSs). We begin by presenting the design procedure for planar absorbers, and then examine how well those designs perform for arbitrarily-shaped objects. Finally, we discuss how the planar design can be modified by tailoring the material parameters of the coating for specific object shapes. A number of test cases are included as examples to illustrate the application of the proposed design methodology, which is a modification of the classical TO paradigm.

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“…A number of examples have been included to illustrate the performances achieved by the absorbing blankets designed by using the developed technique. The interested reader may refer to the publications appearing in [31][32][33][34][35] for related information on the topic discussed in this work.…”

Section: ⅳ Conclusionmentioning

confidence: 99%

Application of Transformation Electromagnetics to Cloak Design and Reduction of Radar Cross Section

Mittra¹,

Zhou²

2013

Journal of electromagnetic engineering and science

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In this paper we present an alternative approach to addressing the problem of designing cloaks for radar targets, which have been dealt with in the past by using the transformation optics (TO) algorithm. The present design utilizes realistic materials, which can be fabricated in the laboratory, and are wideband as well as relatively insensitive to polarization and incident angle of the incoming wave. The design strategy, presented herein, circumvents the need to use metamaterials for cloak designs that are inherently narrowband, dispersive and highly sensitive to polarization and incident angle. A new interpretation of the TO algorithm is presented and is employed for the design of radar cross section-reducing absorbers for arbitrary targets, and not just for canonical shapes, e.g., cylinders. The topic of performance enhancement of the absorbers by using graphene materials and embedded frequency structure surfaces is briefly mentioned. The design procedure for planar absorbing covers is presented and their performance as wrappers of general objects is discussed. A number of test cases are included as examples to illustrate the application of the proposed design methodology, which is a modification of the classical TO paradigm.

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Utilization of Anisotropic Metamaterial Layers in Waveguide Miniaturization and Transitions

Cited by 58 publications

References 8 publications

Impedance-matched absorbers and optical pseudo black holes

Impedance-matched absorbers and optical pseudo black holes

DESIGN OF ABSORPTIVE COATINGS FOR ARBITRARILY SHAPED TARGETS FOR REDUCTION OF RADAR CROSS SECTION (RCS) USING AN ALTERNATIVE TO THE TRANSFORMATION OPTICS (TO) ALGORITHM (Invited Paper)

Application of Transformation Electromagnetics to Cloak Design and Reduction of Radar Cross Section

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