scholarly journals Effective description of THz localized waveguide resonance through metal film with split ring resonator holes: zero refractive index

2010 ◽  
Vol 18 (24) ◽  
pp. 25371 ◽  
Author(s):  
Jin-Kyu Yang ◽  
Chul Kang ◽  
Ikbu Sohn ◽  
Chul-Sik Kee
Keyword(s):  
Refractive Index ◽  
Metal Film ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Localized Waveguide Resonance ◽  
Effective Description ◽  
Waveguide Resonance

Lattice density effect on the negative refractive index of a uniaxial metamaterial

2009 ◽  
Vol 1223 ◽  
Author(s):  
Claudio Amabile ◽  
Enrico Prati
Keyword(s):  
Refractive Index ◽  
Ring Resonator ◽  
Negative Refractive Index ◽  
Microwave Frequency ◽  
Split Ring Resonator ◽  
Collective Effects ◽  
Pass Band ◽  
Lattice Period ◽  
Split Ring ◽  
Lattice Density

ABSTRACTNegative refractive index materials tuned at n = -1 are believed to realize perfect lensing of real and evanescent modes. Metamaterials are the natural candidates to realize negative refractive index by the inversion of the effective dielectric permittiviy and magnetic permeability. The effect of the density on the tuning in the proximity of n = -1 is studied in order to find viable solutions to the issue of discretization of the lattice which correspondingly produces steps in the electromagnetic parameters of metamaterials. We study the microwave frequency negative refractive index of a metamaterial as a function of the density of the lattice period. The negative refractive index is realized by means of a waveguide filled with a split ring resonator lattice, exploited below the cut off frequency of the waveguide. We discuss the pass-band behaviour and the collective effects on the negative refractive index.

scholarly journals Bandwidth and gain enhancement of a circular microstrip antenna using a DNG split ring resonator radome

2019 ◽  
Vol 8 (2) ◽  
pp. 637-643
Author(s):  
Ojo Rasheed ◽  
Mohd Faizal Jamlos ◽  
Ping Jack Soh ◽  
Mohd Aminudin Jamlos ◽  
Muammar Mohamad Isa
Keyword(s):  
Refractive Index ◽  
Microstrip Antenna ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Negative Permittivity ◽  
Double Negative ◽  
Split Ring ◽  
Circular Patch ◽  
Gain Enhancement ◽  
Circular Microstrip Antenna

This paper present the design of a circular patch microstrip antenna with enhancement in terms of bandwidth and gain using a dielectric double negative (DNG) split ring metamaterial radome. This radome is positioned on top of the CP antenna operating from 5.2 GHz to 6.4 GHz. The metamaterial radome comprises of two alternate split rings of negative permittivity, permeability and refractive index. The circular microstrip antenna bandwidth of 430 MHz has been realized by the presence of DNG metamaterial radome compared to 220 MHz without the radome. The gain has been increased as well from 1.84 dBi to 3.87 dBi.

Characteristics of Left Handed Materials

2021 ◽  
Vol 19 (11) ◽  
pp. 01-14
Author(s):  
Thill A. Kadhum Al-Musawi ◽  
Samira Adnan Mahdi ◽  
Sundus Yaseen Hasan AL-Asadi
Keyword(s):  
Computer Simulation ◽  
Refractive Index ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Negative Permittivity ◽  
Split Ring ◽  
Left Handed ◽  
Artificial Materials ◽  
Permittivity And Permeability ◽  
Gap Width

Researchers have been interested in studying so-called Left-Handed Metamaterials LHM, which are artificial materials. These materials have unusual characteristics, like negative permittivity and permeability, and therefore negative index. This paper has been discussed some characteristics of LHM by designing a square split ring resonator SRR and simulating with CST microwave studio (Computer Simulation Technology) to get S-parameters. The broadband frequencies (0-30) GHz were taking to specify the effective range of frequencies to work with, which was found to be between (8- 14) GHz. Then, the parameters of SRR have been varied such as split width on, gap width, metal width, rod width and metal material. The measurements show some of parameters have been affected the values of resonance frequency and the others are not. Also, the negative values of permittivity, permeability, and refractive index have been approved.

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