scholarly journals Wider frequency domain for negative refraction index in a quantized composite right–left handed transmission line

2018 ◽  
Vol 27 (6) ◽  
pp. 068102 ◽  
Author(s):  
Qi-Xuan Wu ◽  
Shun-Cai Zhao
Keyword(s):  
Transmission Line ◽  
Frequency Domain ◽  
Negative Refraction ◽  
Refraction Index ◽  
Left Handed ◽  
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.

Sign in / Sign up

Export Citation Format

Share Document