scholarly journals HIGH GAIN SLOTTED WAVEGUIDE ANTENNA BASED ON BEAM FOCUSING USING ELECTRICALLY SPLIT RING RESONATOR METASURFACE EMPLOYING NEGATIVE REFRACTIVE INDEX MEDIUM

2017 ◽  
Vol 79 ◽  
pp. 115-126
Author(s):  
Adel A. A. Abdelrehim ◽  
Hooshang Ghafouri-Shiraz
Keyword(s):  
Refractive Index ◽  
Ring Resonator ◽  
Negative Refractive Index ◽  
High Gain ◽  
Split Ring Resonator ◽  
Split Ring ◽  
Beam Focusing ◽  
Slotted Waveguide

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.

Analysis and Design of High Gain NRI Superstrate Based Antenna for RF Energy Harvesting System

2016 ◽  
Vol 2 (3) ◽  
pp. 647
Author(s):  
K.K.A. Devi ◽  
C. H. Ng
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Effective Permittivity ◽  
Resonant Cavity ◽  
High Gain ◽  
Split Ring Resonator ◽  
Unit Cell ◽  
Impedance Match ◽  
Strip Line ◽  
Analysis And Design

<p>A high gain patch antenna inspired by 4 layers of negative refractive index (NRI) metamaterial superstrate is proposed to operate at downlink radio frequency (RF) band (935 MHz to 960 MHz of GSM 900). The metamaterial unit cell consists of a nested split ring resonator (SRR) and strip line laminated on other side of FR4 substrate. The effective permittivity and permeability of the proposed unit cell are designed synchronously to approach zero, which leads the NRI superstrate to have impedance match with zero and negative refractive index.The NRI superstrate is studied using Fabry-Perot (F-P) resonant cavity. The gain is improved by 82.48% at the air gap of 55 mm in the desired frequency band.Therefore, the gain of the antenna is effectively enhanced based on the negative refractive index metamaterial. The measured radiation pattern and S parameter results also showed that it has good agreement with the simulation results.</p>

Gain Improvement of Microstrip Patch Antenna Using CLS Split Ring Resonator Metamaterial

Frequenz ◽  
2015 ◽  
Vol 69 (3-4) ◽  
Author(s):  
Pankaj Rameshchandra Katiyar ◽  
Wan Nor Liza Binti Wan Mahadi
Keyword(s):  
Patch Antenna ◽  
Ring Resonator ◽  
Split Ring Resonator ◽  
Microstrip Patch Antenna ◽  
Electromagnetic Energy ◽  
Anechoic Chamber ◽  
Far Field ◽  
Split Ring ◽  
Beam Focusing ◽  
Microstrip Patch

AbstractMetamaterials are artificial materials with negative permittivity and permeability. Metamaterials due to their unique negative parameter are capable of focusing the electromagnetic energy incident upon them. This focusing of electromagnetic energy is used to increase the gain of microstrip patch antenna. A capacitive loaded strip (CLS)-loaded split ring resonator is used to form a multilayer array of metamaterial and used in front of microstrip patch antenna to enhance far-field gain of antenna. An accurate simulation model is created and analyzed using CST. The simulated model is then fabricated and measured in fully anechoic chamber for validation. The far-field gain of regular patch antenna with and without metamaterial is measured in anechoic chamber. The increase in gain by 4 dB is measured at 95 mm from antenna. The beam focusing property is also evident from 3 dB beamwidth of antenna which is reduced to 42.01°.

scholarly journals A Metamaterial Backed Dipole Antenna for High Gain Directional Communications

2016 ◽  
Vol 5 (1) ◽  
pp. 9
Author(s):  
V. P. Sarin ◽  
M. P. Jayakrishnan ◽  
C. K. Aanandan ◽  
M. Pezholil ◽  
V. Kesavath
Keyword(s):  
Dielectric Constant ◽  
Ring Resonator ◽  
Low Cost ◽  
High Gain ◽  
Split Ring Resonator ◽  
Dipole Antenna ◽  
Metamaterial Structure ◽  
Split Ring ◽  
Reflection Phase ◽  
Continuous Wire

The enhanced radiation performance of a dipole antenna backed by the split ring resonator-continuous wire pair array working in the H┴ excitation scenario is presented in this paper.  The H┴ excitation scenario of the metamaterial is used to get zero reflection phase resulting in enhanced gain performance. The two layer meta-structure along with the dipole is fabricated on a low cost substrate of dielectric constant 4.4 and height 1mm. The reflection properties of the metamaterial structure and its effect on the radiation performance of the dipole antenna are presented in this paper.

scholarly journals Effect of Stripline Number on Resonant Frequency of Hexagonal Split Ring Resonator Metamaterial

2020 ◽  
Vol 9 (1) ◽  
pp. 26-30
Author(s):  
Romi Fadli Syahputra ◽  
Yan Soerbakti ◽  
Riad Syech ◽  
Erman Taer ◽  
Saktioto Saktioto
Keyword(s):  
Electromagnetic Field ◽  
Resonant Frequency ◽  
Ring Resonator ◽  
Negative Refractive Index ◽  
Split Ring Resonator ◽  
Electromagnetic Properties ◽  
Strip Line ◽  
Frequency Range ◽  
Split Ring ◽  
Resonant Frequency Shift

Piranti-piranti elektronik maupun optoelektronik yang efisien dan responsif saat ini tengah masif dikembangkan dalam beragam bentuk dan jenis. Meta-material merupakan rancangan optoelektronik yang unik dengan sifat elektromagnetik yang tidak ditemukan secara alami, salah satunya adalah peristiwa indeks bias negatif. Eksplorasi terhadap banyak ragam struktur metamaterial sangat penting dilakukan untuk mengidentifikasi karakteristik tiap struktur. Salah satu struktur metamaterial yang menarik dikaji adalah bentuk heksagonal. Penelitian ini menginvestigasi karakteristik frekuensi resonan dan distribusi medan elektromagnetik metamaterial split ring resonator heksagonal (SRR-H) yang dikombinasikan dengan stripe line (SL) berupa logam tembaga. Lebih lanjut, jumlah SL divariasikan dari 0 - 5 unit dan disimulasikan dalam medium udara dalam rentang frekuensi 1 – 7,5 GHz. Hasil simulasi menunjukan adanya pergeseran frekuensi resonan untuk tiap penambahan SL dalam rentang frekuensi 4,31 – 5,82 GHz. Sebaran medan listrik cenderung terpusat pada cincin resonator sedangkan medan magnet cenderung terdistribusi pada SL. Desain metamaterial SRR-H dengan 3 SL memberikan respon disipasi energi yang terkecil dengan medan E maksimum 2,59 kV×m-1 dan medan H maksimum 8,69 A×m-1. Desain SRR-H ini cukup potensial untuk diaplikasikan sebagai antena gelombang elektomagnetik yang efisien dan juga sebagai biosensor. Efficient and responsive electronic and optoelectronic devices are currently being massively developed in various forms and types. Metamaterial is a unique optoelectronic design with electromagnetic properties that are not found naturally, one of its properties is a negative refractive index. Exploration of different types of metamaterial structures is very important to identify the characteristics of each structure. One of the interesting metamaterial structures is a hexagonal shape. This research investigates the resonant frequency characteristics and electromagnetic field distribution of split-ring resonator (SRR-H) hexagonal-shaped metamaterial which is combined with the copper stripe line (SL). Furthermore, the number of SL is varied from 0 to 5 units and simulated in the air medium in frequency range of 1 - 7.5 GHz. The simulation results show a resonant frequency shift occurred for each SL combination in the 4.31 - 5.82 GHz frequency range. The distribution of the electric field tends to be concentrated on the resonator while the magnetic field tends to be distributed on the SL. The SRR-H metamaterial with 3 SL provides the smallest energy dissipation response with a maximum E field of 2.59 kV×m-1 and a maximum H field of 8.69 A×m-1. The SRR-H design is potential enough to be applied as an efficient electromagnetic wave antenna and also as a biosensor.Keywords: Metamaterials, SRR-H, strip line, resonant frequency, electromagnetic field

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