Unit Cell Block for 3-D Isotropic Negative-Index Metamaterials Impedance-Matched to Free Space by Using Dielectric Cubes and Metallic Mesh

2018 ◽  
Author(s):  
Takuya Yamaguchi ◽  
Takumi Ishiyama ◽  
Tetsuya Ueda ◽  
Tatsuo Itoh
Keyword(s):  
Free Space ◽  
Unit Cell ◽  
Cell Block ◽  
Negative Index ◽  
Metallic Mesh

Free space microwave focusing by a negative-index gradient lens

2006 ◽  
Author(s):  
T. Driscoll ◽  
D. N. Basov ◽  
P. M. Rye ◽  
S. Nemat-Nasser ◽  
D. Schurig ◽  
...  
Keyword(s):  
Free Space ◽  
Negative Index ◽  
Index Gradient

scholarly journals Controlling Refraction Using Sub-Wavelength Resonators

2018 ◽  
Vol 8 (10) ◽  
pp. 1942
Author(s):  
Yue Chen ◽  
Robert Lipton
Keyword(s):  
Frequency Dependence ◽  
Free Space ◽  
Near Infrared ◽  
Center Frequency ◽  
Negative Index ◽  
Index Properties ◽  
Frequency Bands ◽  
Transmitted Signal ◽  
Sub Wavelength

We construct metamaterials from sub-wavelength nonmagnetic resonators and consider the refraction of incoming signals traveling from free space into the metamaterial. We show that the direction of the transmitted signal is a function of its center frequency and bandwidth. The directionality of the transmitted signal and its frequency dependence is shown to be explicitly controlled by sub-wavelength resonances that can be calculated from the geometry of the sub-wavelength scatters. We outline how to construct a medium with both positive and negative index properties across different frequency bands in the near infrared and optical regime.

Free space measured loss comparison of single and double Ring resonators for negative index media

2007 ◽  
Author(s):  
John S. Derov ◽  
Beverly W. Turchinetz ◽  
James W. Dean ◽  
Everett E. Crisman ◽  
Alvin J. Drehman
Keyword(s):  
Free Space ◽  
Ring Resonators ◽  
Negative Index ◽  
Double Ring

Free-space microwave focusing by a negative-index gradient lens

2006 ◽  
Vol 88 (8) ◽  
pp. 081101 ◽  
Author(s):  
T. Driscoll ◽  
D. N. Basov ◽  
A. F. Starr ◽  
P. M. Rye ◽  
S. Nemat-Nasser ◽  
...  
Keyword(s):  
Free Space ◽  
Negative Index ◽  
Index Gradient

scholarly journals Enhancement of inductance along metallic mesh wires in three-dimensional quasi-isotropic metamaterials using high-ε dielectric particles for impedance-matching with free space

2019 ◽  
Vol 6 ◽  
pp. 21
Author(s):  
Takuya Yamaguchi ◽  
Takumi Ishiyama ◽  
Tetsuya Ueda ◽  
Tatsuo Itoh
Keyword(s):  
Free Space ◽  
Composite Structures ◽  
Impedance Matching ◽  
Effective Permittivity ◽  
Three Dimensional ◽  
Wave Impedance ◽  
Negative Permittivity ◽  
Patterned Structures ◽  
Unit Cells ◽  
Metallic Mesh

In this paper, we consider cube-shaped unit cells including high-ε dielectric cubes under magnetic dipole-like resonance placed at the center and metallic mesh wires for negative permittivity to construct three-dimensional quasi-isotropic metamaterials in the microwave region. Basically, such structures suffer from their low wave impedance due to inclusion of high-ε materials. To reduce effective permittivity of the composite structures, we propose to insert additional inductance into the metallic mesh. For the insertion of lumped inductors along the wires, dispersion diagram and the Bloch-impedance are numerically estimated, and converted to effective permittivity and permeability. The numerical simulation results clearly show almost 3-D isotropic propagation characteristics in a specific frequency region and enhancement of the Bloch-impedance close to free space in the left-handed region. The lumped inductors are replaced by meander-line strip patterns for practical configurations. The metallic patterned structures also achieve the enhanced Bloch impedance that is well-matched to free space.

scholarly journals A Miniaturized Antenna with Negative Index Metamaterial Based on Modified SRR and CLS Unit Cell for UWB Microwave Imaging Applications

Materials ◽  
2015 ◽  
Vol 8 (2) ◽  
pp. 392-407 ◽  
Author(s):  
Md. Islam ◽  
Mohammad Islam ◽  
Md. Samsuzzaman ◽  
Mohammad Faruque ◽  
Norbahiah Misran ◽  
...  
Keyword(s):  
Microwave Imaging ◽  
Unit Cell ◽  
Negative Index ◽  
Miniaturized Antenna

Sensitivity and the available free space per molecule in the unit cell

2011 ◽  
Vol 17 (10) ◽  
pp. 2569-2574 ◽  
Author(s):  
Miroslav Pospíšil ◽  
Pavel Vávra ◽  
Monica C. Concha ◽  
Jane S. Murray ◽  
Peter Politzer
Keyword(s):  
Free Space ◽  
Unit Cell

Polarization-independent single-layer ultra-wideband frequency-selective surface

2015 ◽  
Vol 9 (1) ◽  
pp. 93-97 ◽  
Author(s):  
Ramprabhu Sivasamy ◽  
Balaji Moorthy ◽  
Malathi Kanagasabai ◽  
Jithila V. George ◽  
Livya Lawrance ◽  
...  
Keyword(s):  
Free Space ◽  
Single Layer ◽  
Normal Incidence ◽  
Frequency Selective Surface ◽  
Unit Cell ◽  
Ultra Wideband ◽  
Attenuation Level ◽  
Wide Range ◽  
Frequency Selective ◽  
Polarization Independent

An ultra-wideband (UWB) frequency-selective surface (FSS) exhibiting band rejection characteristic is presented in this paper. The proposed unit cell has the size of 14 × 14 mm2 which is approximately 0.18 × 0.18 λo, where λo corresponds to free space wavelength at the lower cut-off frequency. The proposed UWB FSS consists of a single-layer substrate and provides 20 dB attenuation level for a wide bandwidth of 7.53 GHz at the normal incidence. The proposed FSS is polarization independent and also provides angular-independent operation for the EM wave incidences of 15°, 30° and 45° with 11.5 dB attenuation over a wide range from 4 to 14 GHz.

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