scholarly journals Wideband Negative Permittivity and Double Negative Fishnet-Mushroom-Like Metamaterial in X-Band Waveguide

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Ahmed Mahmood ◽  
Golge Ogucu Yetkin ◽  
Cumali Sabah
Keyword(s):  
Dielectric Substrate ◽  
Negative Permittivity ◽  
Negative Permeability ◽  
Double Negative ◽  
Characteristic Parameters ◽  
Electromagnetic Band Gap ◽  
Left Handed ◽  
X Band ◽  
Metallic Parts ◽  
Good Agreement

A Fishnet-Mushroom-like metamaterial electromagnetic behaviour is represented in S-parameters numerically and experimentally for X-band frequencies arena. The design has introduced a dielectric substrate as a host with metallic parts. The proposed design is predicted to provide the electromagnetic band gap characterization with desired reiterative characteristic parameters, negative permittivity, and negative permeability exhibiting a double negative left-handed region, which is identified with the X-band regime with good agreement between the simulated and the measured results.

scholarly journals NESTED CIRCULAR ELLIPTICAL SHAPED MIXED LOOP RESONATOR BASED BANDPASS FILTER FOR MICROWAVE APPLICATIONS / PENAPIS JALUR BERASASKAN CAMPURAN GEGELUNG PENYALUN BERBENTUK SARANG BULAT UNTUK APLIKASI GELOMBANG MIKRO

2020 ◽  
Vol 82 (2) ◽  
Author(s):  
Mohammad Rashed Iqbal Farque ◽  
Md. Jubaer Alam ◽  
Muhamad Roszaini Roslan ◽  
Mohammad Tariqul Islam
Keyword(s):  
Refractive Index ◽  
Relative Permittivity ◽  
Bandpass Filter ◽  
Dielectric Substrate ◽  
Simulation Software ◽  
Double Negative ◽  
Scattering Parameters ◽  
Current Distributions ◽  
X Band ◽  
Microwave Applications

An elliptical thumb printed nested circular mixed loop resonator (MLR) is introduced in this article to design a multiple bandpass filter for microwave applications. The proposed structure is composed of a series of loop resonators on a Rogers RT-5880 dielectric substrate, where the overall system is developed into a 377Ω framework. Similar structure is designed on both sides of the substrate and an investigation is made on scattering parameters, relative permittivity, permeability, refractive index and current distributions. The 12 ´ 14 mm2 structure is designed and evaluated by a simulation software CST microwave studio and the metamaterial characteristics have been classified by Nicolson-Ross-Weir method at the filtering frequencies. The proposed filter shows resonances at 2.65 GHz, 5.85 GHz, 7.12 GHz, and 8.59 GHz, and the measured results are compared with the simulated ones. With a favorable design and double-negative characteristics, this design is suitable for multiple bandpass filter particularly for S, C, and X-band applications.

scholarly journals A Novel Tunable Triple-Band Left-Handed Metamaterial

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Si Li ◽  
Atef Z. Elsherbeni ◽  
Wenhua Yu ◽  
Wenxing Li ◽  
Yunlong Mao
Keyword(s):  
Current Density ◽  
Surface Current ◽  
Wide Band ◽  
The Other ◽  
Negative Permittivity ◽  
Negative Permeability ◽  
Surface Current Density ◽  
Density Distributions ◽  
Left Handed ◽  
Triple Band

A novel tunable triple-band left-handed metamaterial (LHM) composed of a single-loop resonator (SLR) and a variable capacitor-loaded short wire pair (CL-SWP) printed on both sides of a substrate is presented in this paper. The CL-SWP-based metamaterial (MTM) is a novel single-sided LHM. It is theoretically analyzed capable of extracting tunable negative permeability and a wide-band negative permittivity. We ran simulations for the CL-SWP-based MTM, the SLR-based MTM, and the proposed LHM. Together with the measured results, it is identified that this novel LHM exhibits a tunable triple-band left-handed (LH) property. With the increase of the loaded capacitance, one LH band is relatively stable, while the other two are moving towards lower frequencies with their bandwidth getting wider and narrower, respectively. The surface current density distributions indicate that the first LH band is mainly decided by the SLR, one of the rest 2 LH bands is mainly decided by the CL-SWP, and the other one is decided by the SLR and CL-SWP together.

POSSIBLE EXISTENCE OF GRANULAR LEFT-HANDED MATERIALS BASED ON BRUGGEMAN FORMALISM

2010 ◽  
Vol 24 (27) ◽  
pp. 5469-5474
Author(s):  
WEIKAI XU ◽  
YANZHANG DONG ◽  
SHUTIAN LIU
Keyword(s):  
Negative Permittivity ◽  
Negative Permeability ◽  
Left Handed ◽  
Two Component ◽  
Current Stage

In the current stage, left-handed material (LHM) has aroused wide interest based on several basic prototypes such as metamaterials. In this work, we have theoretically investigated the possible existence of granular LHM by using the Bruggeman formalism. The Wiener bounds and the Hashin–Shtrikman bounds were invoked and some examples were represented. We had found that when the dissipations are increased adequately, the estimates of the Bruggeman formalism will lie within the two bounds rigorously, even if the two permittivities have real parts of opposite signs. Thus, one particulate LHM may be achieved by choosing the two component mediums with negative permittivity and negative permeability, respectively.

Double Negative Optical Metamaterial with All-Dielectric Fishnet Structure

2013 ◽  
Vol 873 ◽  
pp. 813-818 ◽  
Author(s):  
Chu Wen Lan ◽  
Xiao Jian Fu ◽  
Xiao Ming Liu ◽  
Bo Li ◽  
Ji Zhou
Keyword(s):  
High Performance ◽  
Figure Of Merit ◽  
Negative Refraction ◽  
Wide Band ◽  
Negative Permeability ◽  
Double Negative ◽  
Negative Index ◽  
Left Handed ◽  
Silicon Based ◽  
Multilayer Dielectric

An all-dielectric fishnet metamaterial (DFM) composed of multilayer dielectric structure with periodically patterned holes is proposed to generate left-handed behavior in optical frequency region. Different from the metallic fishnet negative index metamaterial realized by coupling the neighbouring functional layers along the propagation direction, this DFM owes its simultaneous negative permeability and permittivity to the hybrid coupled resonances in the same layer. Based on this configration, a wide-band and polarization-independent negative refraction with maximum figure of merit as large as 13.85 is obtained by a silicon-based DFM at 450 nm wavelength. Simple and easy to fabricate, this concept is believed to provide an alternative route to realize high-performance negative index metamateirals at optical frequencies.

The Left-Handed Properties of the Composite Medium Composed of Ferrite Cubes’ Array and Copper Net

2010 ◽  
Vol 434-435 ◽  
pp. 343-345 ◽  
Author(s):  
Li Hui Zhang ◽  
Yang Bai ◽  
Jin Xu Li ◽  
Li Jie Qiao
Keyword(s):  
Negative Refraction ◽  
Composite Medium ◽  
Negative Permittivity ◽  
Electromagnetic Properties ◽  
Pass Band ◽  
Negative Permeability ◽  
Wave Amplification ◽  
Left Handed ◽  
Negative Role ◽  
Difference Time

Left-handed material (LHM), whose permittivity and permeability are both negative, has attracted much attention due to its exotic electromagnetic properties, such as negative refraction, backward wave propagation and evanescent wave amplification. The microwave left-handed property of a composite medium composed of ferrite cubes’ array and copper net was studied using the method of finite difference time domain in this paper. An obvious left-handed pass band emerged when ferrite cubes were combined with longitudinal copper wires, because the ferrite produced negative permeability by the ferromagnetic resonance and the copper wires produced negative permittivity by the plasma. With the addition of horizontal copper wires, the transmission intensity of the pass band was gradually weakened. It can be concluded that the horizontal wires played a negative role in realizing the composite LHM with ferrite cubes and copper net. This work gives an instructive direction to the fabrication of 3D LHMs.

scholarly journals Resonance Characteristics and Effective Parameters of New Left Hand Metamaterial

2015 ◽  
Vol 15 (3) ◽  
pp. 497
Author(s):  
Rajni Rajni ◽  
Anupma Marwaha
Keyword(s):  
Negative Refraction ◽  
New Left ◽  
Unit Cell ◽  
Negative Permittivity ◽  
Negative Permeability ◽  
Double Negative ◽  
Electric Conduction ◽  
Effective Parameters ◽  
Left Hand ◽  
Material Parameters

It is essential to alter effective electromagnetic parameters of a material to enhance its response. In the present work, we propose a novel Left Hand Metamaterial (LHM) structure comprising dual turn spiral resonator (DTSR) and capacitance loaded strips (CLS). This structure is numerically explored to examine the resonance and effective material parameters i.e. permeability and permittivity. The negative refraction in the unit cell is confirmed with identification of double negative region (negative permittivity, ε and negative permeability, µ ) on placing the unit cell in a waveguide with well defined Perfect Electric Conduction/Perfect Magnetic Conduction boundary conditions.

A Novel Compact UWB Bandpass Filter with Quad-Notched Bands Based on S-SCRLHs Resonator

Frequenz ◽  
2015 ◽  
Vol 69 (7-8) ◽  
Author(s):  
Changming Xie ◽  
Chunhua Wang
Keyword(s):  
Satellite Communication ◽  
Bandpass Filter ◽  
Ultra Wideband ◽  
Left Handed ◽  
X Band ◽  
Compact Size ◽  
Quad Notched Bands ◽  
Good Agreement

AbstractA novel compact ultra-wideband (UWB) bandpass filter (BPF) with a quad band-notched function using S-SCRLHs (splitted simplified composite right/left-handed) resonator is presented. The S-SCRLHs resonator, which exhibits quadruple resonance, is realized by coupling double S-SCRLH resonator. The S-SCRLHs resonator is integrated into a conventional UWB BPF. The notched frequencies can be adjusted according to specification by altering the S-SCRLHs resonator. Band-rejected filtering properties around the C-band satellite communication band, 5.2 GHz WLAN band and the X-band satellite communication band are generated. The notching frequencies are located at 4.2/5.2/6.3/7.8 GHz. Both simulated and measured results are provided with good agreement. Compared with other BPFs, the proposed BPF has the advantages of compact size, multi-stopband and good selectivity.

An octagonal split ring resonator-based double negative metamaterial for S-, X- and Ku-band applications

2021 ◽  
pp. 146442072110171
Author(s):  
Ismatul N Idrus ◽  
Mohammad RI Faruque ◽  
Sabirin Abdullah ◽  
Mohammad T Islam ◽  
Mayeen U Khandaker ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Satellite Communication ◽  
Dielectric Substrate ◽  
Split Ring Resonator ◽  
Circular Ring ◽  
New Combination ◽  
Double Negative ◽  
X Band ◽  
Resonance Frequencies ◽  
Ku Band

This study aimed to produce a miniaturised double negative metamaterial with a lower resonance frequency. Therefore, a new combination of a multi-circular ring connected with octagonal shape ring metamaterial was developed on a 9 × 9 mm2 dielectric substrate material with a thickness of 1.6 mm, named the Flame Retardant 4 (FR-4). While the selected frequency ranged between 0 and 18 GHz for the unit and array metamaterial design. Numerical simulation was used for the design and analysis of the proposed metamaterial. A few analysis were performed to validate the performance of the new design including the analyses of the different dimensions of the substrate and varying widths of the split gaps. The proposed design structure manifested resonance frequencies at S, X and Ku-bands. The resonance frequency at S-band (3.31 GHz) and X-band (8.60 GHz) presented double-negative (DNG) metamaterial behaviour while X-band (11.93 GHz) and Ku-band (12.99 GHz) presented single-negative (SNG) medium characteristics. The simulation and measured results almost coincided with each other. The compactness of the proposed design was proven by the effective medium ratio (EMR) of 10.07. In conclusion, the miniaturised structure can be accredited for satellite communication and radar applications.

scholarly journals Depiction and analysis of a modified theta shaped double negative metamaterial for satellite application

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 839-847 ◽  
Author(s):  
Md. Jubaer Alam ◽  
Mohammad Rashed Iqbal Faruque ◽  
Taya Allen ◽  
Sabirin Abdullah ◽  
Mohammad Tariqul Islam ◽  
...  
Keyword(s):  
Satellite Communication ◽  
Negative Refraction ◽  
Dielectric Substrate ◽  
Unit Cell ◽  
Negative Permittivity ◽  
Basic Unit ◽  
Double Negative ◽  
Metamaterial Structure ◽  
Wide Range ◽  
Array Structures

Abstract In this article, a modified Theta shaped, compact double negative metamaterial structure is designed and presented for satellite communication. Two oppositely faced E-shaped resonators are connected with the substantial Theta to complete the structure. A low profile dielectric substrate FR-4 is used to design the 9 × 9 mm2 unit cell which has a succinct structure where the attainment of the resonator is explored both integrally and experimentally. The proposed metamaterial has a transmission coefficient of 13 GHz (bandwidth) with a 500 MHz band gap at the middle. A correlation is made between the basic unit-cell and array structures, and a comparison is shown among 1 × 2, 2 × 2, and 4 × 4 array structures with 1 × 2, 2 × 2, and 4 × 4 unit-cell configurations to validate the performance of the proposed metamaterial. It has also been observed by the Nicolson–Ross–Weir approach at the resonating frequencies. The effective electromagnetic parameters retrieved from the simulation of the S-parameters imply that the metamaterial structure shows negative refraction bands. The structure shows negative permittivity at 2.60 to 5.16 GHz, 6.63 to 9.31 GHz and 13.03 to 16.18 GHz and negative permeability at 7.74 to 13.07 GHz and 13.88 to 16.55 GHz, respectively. It exhibits double-negative phenomena at X and Ku bands with a frequency range of about 1.17 GHz (8.14 – 9.31 GHz) and 1.42 GHz (13.80 – 15.22 GHz), respectively. Having an auspicious design and wide range double negative characteristics, this structure can be applied to satellite communication.

A New Double Negative Metamaterial for C-Band Microwave Applications

2014 ◽  
Vol 974 ◽  
pp. 33-37 ◽  
Author(s):  
Sunbeam Islam Sikder ◽  
Rashed Iqbal Faruque Mohammad ◽  
Tariqul Islam Mohammad
Keyword(s):  
Cell Structure ◽  
Simulation Software ◽  
Unit Cell ◽  
Negative Permittivity ◽  
Ring Resonators ◽  
Electromagnetic Properties ◽  
Negative Permeability ◽  
Double Negative ◽  
Electromagnetic Structure ◽  
Transmission Parameters

Metamaterials are artificial materials that show extra ordinary electromagnetic properties which are not available in nature. It has opened a new era in the field of material science. It can be defined as an exotic electromagnetic structure that may show both negative permittivity and negative permeability simultaneously within a frequency range. Metamaterials with simultaneous negative permeability and permittivity are called Double Negative Metamaterials (DNG). In this paper, a new metamaterial unit cell structure has been proposed that exhibits resonance within frequency of C-band and shows a negative permeability and permittivity at that resonant frequency. In the proposed structure, two separate split ring resonators and a metallic bar has been used. A commercially available simulation software CST Microwave Studio has been used to get the reflection and transmission parameters for the unit cell.

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