scholarly journals Negative refraction index of the quantum lossy left-handed transmission lines affected by the displaced squeezed Fock state and dissipation

2017 ◽  
Vol 105 ◽  
pp. 209-215 ◽  
Author(s):  
Shun-Cai Zhao ◽  
Xiao-Jing Wei ◽  
Qi-Xuan Wu
Keyword(s):  
Transmission Lines ◽  
Negative Refraction ◽  
Refraction Index ◽  
Left Handed ◽  
Fock State ◽  
Negative Refraction Index

Quantum Effects on Negative Refraction Index of Mesoscopic Left-Handed Transmission Line in Thermal Fock State

2017 ◽  
Vol 46 (4) ◽  
pp. 419002
Author(s):  
郭宏伟 GUO Hong-wei ◽  
赵顺才 ZHAO Shun-cai ◽  
魏晓菁 WEI Xiao-jing ◽  
贾靖 JIA Jing
Keyword(s):  
Transmission Line ◽  
Negative Refraction ◽  
Quantum Effects ◽  
Refraction Index ◽  
Left Handed ◽  
Fock State ◽  
Negative Refraction Index

scholarly journals Design of High-Gain and Beam Steering Antennas Using a New Planar Folded-Line Metamaterial Structure

2014 ◽  
Vol 2014 ◽  
pp. 1-16 ◽  
Author(s):  
Minh Thuy Le ◽  
Quoc Cuong Nguyen ◽  
Tan Phu Vuong
Keyword(s):  
Microstrip Antenna ◽  
Negative Refraction ◽  
Beam Steering ◽  
Effective Permittivity ◽  
Refraction Index ◽  
High Gain ◽  
Left Handed ◽  
Novel Structure ◽  
Negative Refraction Index ◽  
Line Analysis

In the last few years, there has been growing interest in employing metamaterials (MTMs) to enhance antenna gain. In this paper we proposed a novel structure of planar folded-line left-handed metamaterial (FL-LHM) and applied it to improve the gain of three 5.8 GHz microstrip antenna types: a circularly polarized patch antenna, an antenna array, and a beam steering antenna. The planar FL-LHM structure was designed based on transmission line analysis. Their scattering parameters were obtained using a numerical model; the negative effective permittivity and permeability were then calculated from these parameters for the assessment of negative refraction index region. The S11and radiation patterns of three fabricated antennas were measured; these results matched well with the simulation. We observed that the gain was increased up to 3 dBi for all the antennas. In addition, we were also able to maintain the circular polarization as well as the steering of the antenna without changing its dimensions.

scholarly journals Equivalence between positive and negative refractive index materials in electrostatic cloaks

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Xingcai Li ◽  
Juan Wang ◽  
Jinghong Zhang
Keyword(s):  
Refractive Index ◽  
Negative Refraction ◽  
Negative Refractive Index ◽  
Analytical Formula ◽  
Refraction Index ◽  
Dielectric Materials ◽  
Static Field ◽  
Colloid Science ◽  
Negative Refraction Index ◽  
Equivalence Relationship

AbstractWe investigate, both theoretically and numerically, the equivalence relationship between the positive and negative refraction index dielectric materials in electrostatic invisibility cloak. We have derived an analytical formula that enables fast calculate the corresponding positive dielectric constant from the negative refraction index material. The numerical results show that the negative refraction index material can be replaced by the positive refractive index materials in the static field cloak. This offers some new viewpoints for designing new sensing systems and devices in physics, colloid science, and engineering applications.

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