Waves in Fractional Dual Planar Waveguides Containing Chiral Nihility Metamaterial

Naqvi, A.; Hussain, Akhtar; Naqvi, Qaisar Abbas

doi:10.1163/156939310792149614

Cited by 41 publications

(28 citation statements)

References 26 publications

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“…The dispersion characteristics obtained by (8) and the azimuthal interaction impedance characteristics obtained by (10), closely agree with those obtained using HFSS -a commercially available simulation software -within 0.1% and 0.5% (Fig. 2), respectively, in both the configurations, for the typically chosen TE 01 mode (Fig.…”

Section: Resultssupporting

confidence: 76%

“…In general, in the present analysis one can calculate K θ,0 at any radial location within disc-free region where the electric field would be maximum for the beam-wave interaction with gyrating electron beam in the standpoint application of the structure in a gyro-TWT. For the purpose of optimizing the beam position in both the configurations, the azimuthal interaction impedance characteristics are plotted for various sets of structure parameters in TE 01 mode taking beam radius as a parameter and it has been found that K θ,0 maximizes around middle of the disc-free region, i.e., r = (r C (8) same as given in [31], thus the dispersion relation (8) passes to that for thick discloaded circular waveguide [31] (without coaxial insert), which further for the special case of T → 0 passes to that for infinitely thin discloaded circular waveguide [30]. Dispersion and azimuthal interaction impedance characteristics of disc-loaded-coaxial waveguide in configurations A (solid curve) and B (broken curve), typically for TE 01 mode excitation, obtained using present analysis validated against those obtained using HFSS.…”

Section: Resultsmentioning

confidence: 99%

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Beam-Absent Analysis of Disc-Loaded-Coaxial Waveguide for Application in Gyro-TWT (Part-1)

Kesari¹

2010

PIER

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Abstract-The electromagnetic field analysis of the disc-loadedcoaxial waveguide in two configurations was developed in TE-mode for its potential application in the fast-wave regime using the field matching technique at the cylindrical interface between disc-free and disc-occupied structure regions. The space harmonics were considered for the axial periodicity and the azimuthal harmonics were ignored for azimuthal symmetry of the present configurations. The dispersion and azimuthal interaction impedance characteristics obtained by present analysis were validated against those obtained by simulation software -HFSS within 0.1% and 0.5%, respectively. In special cases, the disc-loaded-coaxial structure reverts to well known conventional structures. The effect of structure parameters on the shape of dispersion characteristics was investigated in order to obtain a wideband-coalescence between the beam-and waveguide-mode dispersion characteristics, required for the wideband device performance, without deteriorating the azimuthal interaction impedance value.

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Section: Resultssupporting

confidence: 76%

Section: Resultsmentioning

confidence: 99%

Beam-Absent Analysis of Disc-Loaded-Coaxial Waveguide for Application in Gyro-TWT (Part-1)

Kesari¹

2010

PIER

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“…During the past several years, chiral metamaterials as a kind of artificial materials has attracted an enormous amount of interest that could be used to achieve many customized functionalities, such as the negative refraction and giant optical activity [10][11][12][13][14][15][16][17][18][19][20], and many other applications [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The constitutive equations for chiral media assuming a time harmonic dependence e jωt are [1]:…”

Section: Introductionmentioning

confidence: 99%

Application of Chiral Layers and Metamaterials for the Reduction of Radar Cross Section

Tehrani¹,

Abdolali²,

Zarifi³

et al. 2013

PIER

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Abstract-In this paper, the applications of chiral layers and metamaterials as radar absorbing materials are investigated. A perfect electric conductor plate covered by a chiral metamaterial is considered and after the formulation of the problem, reflection of the structure under an oblique plane wave incidence of arbitrary polarization is investigated. Then several examples of the applications of chiral layers in nondispersive, dispersive, and chiral nihility conditions are provided to design of zero reflection coatings. Finally, application of chiral metamaterial structures as microwave absorbers is discussed. In some of the provided examples, the method of genetic algorithm is used to optimize chiral coatings for the minimization of co-and cross reflected power.

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“…Study of nihility/chiral nihility metamaterials is a topic of current research by several researchers [46][47][48][49][50][51][52][53][54][55][56][57]. Naqvi contributed many research articles on chiral nihility and fractional dual solutions in chiral nihility metamaterial [51][52][53][54][55][56][57].…”

Section: Introductionmentioning

confidence: 99%

Fields in Fractional Parallel Plate D'b', Db' and d'B Waveguides

Gulistan¹,

Majeed²,

Syed³

2013

PIER B

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Abstract-D B , DB and D B boundary conditions are used to investigate the resulting field patterns inside a parallel plate waveguide. The D B boundary conditions are accomodated by assigning the behavior of perfect magnetic conductor (PMC) for transverse electric mode (TE) and that of perfect electric conductor (PEC) for transverse magnetic (TM) mode, to the boundary, respectively. Likewise, DB boundary conditions are incorporated by assuming the behavior of boundary as PMC for both the TE mode and TM mode. Finally D B boundary conditions are realized by assigning PEC characteristic to the boundary for both TE and TM modes. A general wave propagating inside the parallel plate waveguide is assumed and decomposed into TE and TM modes for the purpose of analysis. Fractional curl operator has been used to study the fractional parallel plate D B , DB and D B waveguides for different values of fractional parameter α. Behavior of the field patterns in the waveguides are studied with respect to the fractional parameter α describing the order of the fractionalization.

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Waves in Fractional Dual Planar Waveguides Containing Chiral Nihility Metamaterial

Cited by 41 publications

References 26 publications

Beam-Absent Analysis of Disc-Loaded-Coaxial Waveguide for Application in Gyro-TWT (Part-1)

Beam-Absent Analysis of Disc-Loaded-Coaxial Waveguide for Application in Gyro-TWT (Part-1)

Application of Chiral Layers and Metamaterials for the Reduction of Radar Cross Section

Fields in Fractional Parallel Plate D'b', Db' and d'B Waveguides

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