Broadband transmission below the cutoff frequency of a waveguide loaded with resonant scatterer arrays

Lubkowski, Grzegorz; Damm, Christian; Bandlow, Bastian; Schuhmann, Rolf; Schüßler, Martin; Weiland, Thomas

doi:10.1049/iet-map:20050322

Cited by 18 publications

(10 citation statements)

References 12 publications

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“…The improvement from 3.1 dB/cm to 0.5 db/cm using narrowband double-stub tuners was reported in the original study (Hrabar et al, 2005a). A recent study (Lubkowski et al, 2007) reported an insertion loss lower than 0.4 dB/cm in a wide operation band, which was achieved by the optimization of the design parameters.…”

Section: Experimental Investigationmentioning

confidence: 72%

Subwavelength Guiding of Electromagnetic Energy in Waveguide Filled with Anisotropic Mu-Negative Metamaterial

Hrabar

Zaluski

2008

Electromagnetics

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A counter-intuitive phenomenon of propagation below cut-off in a waveguide filled with an anisotropic mu-negative metamaterial is investigated analytically, numerically, and experimentally. It is shown that the equivalent plane waves that make up the waveguide mode are inhomogeneous, and this fact is responsible for subwavelength guiding of electromagnetic energy. It was also found that the microscopic ('in-cell') magnetic field distribution in a waveguide filled with split-ring resonators may significantly differ from the distribution in the homogenized waveguide. However, spatial averaging of a numerically calculated magnetic field across the unit cell yielded a distribution that was very similar to the distribution in the continuous mu-negative material. Experimental waveguides filled with split-ring resonators were prototyped in the 8-GHz band, and measurement results were found to be in good agreement with all analytical and numerical predictions. This shows that it is indeed possible to interpret the waveguide filled with split-ring resonators as a homogenized waveguide filled with a continuous anisotropic mu-negative metamaterial.

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Section: Experimental Investigationmentioning

confidence: 72%

Subwavelength Guiding of Electromagnetic Energy in Waveguide Filled with Anisotropic Mu-Negative Metamaterial

Hrabar

Zaluski

2008

Electromagnetics

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“…To experimentally verify the possibility for obtaining the desired bandwidth below the cutoff frequency of the waveguide, the arrays build of metamaterial elements are fabricated using photo lithography and wet etching process [13].…”

Section: Resultsmentioning

confidence: 99%

Metamaterial Loaded Waveguides for Miniaturized Filter Applications

Lubkowski¹,

Damm²,

Bandlow³

et al. 2008

Frequenz

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The metamaterial loaded waveguides offer the possibility to obtain desired transmission characteristics below the cutoff frequency of the hollow waveguide. This property allows for the design and fabrication of narrowband and broadband miniaturized waveguide filters. The metamaterial inclusions are designed with CAD tools and fabricated in the form of resonant elements arrays loading the X-band rectangular waveguide. The experimental results are compared with the simulations validating the proposed design approach.

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“…This work was further extensively studied by Hrabar et al [3]. A lot of researches have been done to improve bandwidth and insertion loss of this below cutoff transmission such as [4].…”

Section: Introductionmentioning

confidence: 94%

“…The spread and narrow path of each of these divisions can be computed by the equations (1) and (2) respectively. Finally using the inference rules, the computed narrow paths and spreads, the output can be calculated by equation (4). The ALM based extracted coupling surfaces are shown in Fig.…”

Section: Coupling Factor Modeling Using Almmentioning

confidence: 99%

Active learning method for designing miniaturized waveguide filters loaded by broadside-coupled split ring resonators

Rezaee

Esfahani

Knoechel

et al. 2011

2011 International Conference on Electromagnetics in Advanced Applications

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 This paper focuses on the design and fabrication of miniaturized rectangular waveguide bandpass filters which are loaded by broadside-coupled split ring resonators. The conventional coupling matrix approach is proposed to design these kinds of filters. Also the time consuming process of coupling factor computation which is based on full wave simulations is replaced by a very fast and accurate fuzzy based method which is named active learning method (ALM). Therefore coupling factor computation time decreases to several minutes instead of several hours in the conventional approach while keeping accuracy. Using the ALM-based extracted coupling factor surfaces two Chebychev bandpass filters were designed and fabricated. A very good agreement between simulation and measurement results shows the accuracy of the proposed method.

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Broadband transmission below the cutoff frequency of a waveguide loaded with resonant scatterer arrays

Cited by 18 publications

References 12 publications

Subwavelength Guiding of Electromagnetic Energy in Waveguide Filled with Anisotropic Mu-Negative Metamaterial

Subwavelength Guiding of Electromagnetic Energy in Waveguide Filled with Anisotropic Mu-Negative Metamaterial

Metamaterial Loaded Waveguides for Miniaturized Filter Applications

Active learning method for designing miniaturized waveguide filters loaded by broadside-coupled split ring resonators

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