Planar negative refractive index media using periodically L-C loaded transmission lines

Eleftheriades, George V.; Iyer, Ashwin K.; Kremer, P.C.

doi:10.1109/tmtt.2002.805197

Cited by 1,283 publications

(759 citation statements)

References 13 publications

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“…The central tile has a fifth port connected to a central point within it. Each tile is constructed so that they all have the same characteristic impedance [14] , and the phase of is [12]. When the input port is excited, the central node voltages of each tile are equal in both amplitude and phase and this means that the amplitude of waves emanating from the output ports will have equal magnitude, and that the input impedance of the input port (port 0) will be [12].…”

Section: Tessellated Metamaterials Structurementioning

confidence: 99%

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Implementation of a Microstrip Square Planar <formula formulatype="inline"><tex Notation="TeX">$N$</tex></formula>-Way Metamaterial Power Divider

Eccleston

Zong

2009

IEEE Trans. Microwave Theory Techn.

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Abstract-This paper describes a compact square-shaped 20-way metamaterial power divider implemented in microstrip technology and lumped capacitors and inductors. The divider comprises 12 square tiles exhibiting left-handed behavior and 13 square tiles exhibiting right-handed behavior arranged in a checkerboard tessellation (or mosaic). The divider relies upon the infinite wavelength phenomena in two dimensions and this requires the left-handed tiles have an insertion phase between any two of its sides equal to, but with opposite sign, of that of the right-handed tiles. To achieve tessellation, both tile types must be the same size. The design method is based upon an analytic formulation, and was applied to the realization of a 20-way power divider operating at 1 GHz that uses surface-mount lumped components. The resulting divider was 50 mm by 50 mm. Over a 10% bandwidth, the measured insertion loss was less than 1.3 dB, the measured couplings track within 1 dB and 6 , and the measured input port return loss and isolation was greater than 20 dB. This level of isolation was achieved without isolation resistors. Equal in-phase power division to output ports on the square-shaped periphery allows compact integration with other planar circuit modules in a combined amplifier. The design method can be extended to -way power division where is an odd integer multiple of 4.Index Terms-Infinite wavelength, left-handed materials, metamaterials, microstrip, microwave circuits, negative refractive index, power combining, power dividers.

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Section: Tessellated Metamaterials Structurementioning

confidence: 99%

“…8(a)] can be treated as 2-D periodic structures. Similar to [14], one can use 1-D periodic structure analysis [17] to analyze the 2-D structure. If the tessellation of Fig.…”

Section: Design Of the Tessellated Metamaterialsmentioning

confidence: 99%

Implementation of a Microstrip Square Planar <formula formulatype="inline"><tex Notation="TeX">$N$</tex></formula>-Way Metamaterial Power Divider

Eccleston

Zong

2009

IEEE Trans. Microwave Theory Techn.

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“…Recently, metamaterial based composite right/left-handed (CRLH) transmission line has introduced a new method for designing and miniaturizing multiband microwave devices due to its unique phase response [6]. Moreover, CRLH transmission line is utilized in designing a single wideband bandpass filter [7][8][9][10]. For instance, in [11] and [12] an ultra-wideband bandpass filter is achieved by adopting the concept of balanced CRLH-TL to obtain a single band pass filter without any gap between right-and left-handed passbands.…”

Section: Introductionmentioning

confidence: 99%

Compact Dual-Wideband Bandpass Filter Using CSRR Based Extended Right/Left-Handed Transmission Line

Fathi¹,

Atlasbaf²,

Forooraghi³

2018

PIER C

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Abstract-In this paper a miniaturized dual wideband bandpass filter is designed by the modified extended composite right/left-handed transmission line (ECRLH-TL) under balanced conditions in each right/left-hand passbands. A novel equivalent circuit is proposed to provide the design and an implementation of ECRLH unit-cell by means of the complementary, split ring resonator (CSRR) on the ground plane. Since CSRR is utilized as an alternative to implementing one of the resonators of ECRLH unit-cell, the size and complexity of the structure can be consequently reduced. An example of a dual band pass filter with 3 dB frequency bands from 3.2 to 4.8 GHz and from 6 to 7 GHz is investigated. There is a good agreement among circuit, electromagnetic simulations and measured results in both passbands. The measured insertion loss is better than 0.5 and 1 dB in first and second bands central frequency, respectively. The group delay which is an important factor in wideband communications is about 0.62 ns and 0.71 ns, respectively, in the first and second band central frequencies. The final dimensions of the miniaturized filter are reduced to 8.88 mm × 8.18 mm.

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“…Microwave periodic structures have gained increasing attention during last few decades due to their interesting propagation characteristics [1,2]. The upper and lower limits of the bandgap (or stopband) of such a microwave structure depend on the lattice structure, periodicity (lattice constant) and the geometrical configuration of the unit cell.…”

Section: Introductionmentioning

confidence: 99%

Equivalent-Circuit Models for Efficient Transmission and Dispersion Analyses of Multi-State Periodic Structures

Matekovits

Thalakotuna²,

Hay

et al. 2015

PIER

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Abstract-An equivalent-circuit model for a reconfigurable unit cell is proposed. This circuit model facilitates fast prediction of scattering parameters and dispersion analyses of a reconfigurable periodic structure. The cutoff frequencies obtained using equivalent-circuit models are in excellent agreement with those from measurements and full-wave numerical simulations. The proposed circuit model is then modified to include non-ideal, commercial RF FET switches. The effect of such a switch in each state, On or Off, is modeled by a frequency-dependant impedance, derived from the scattering parameters of the switch. The proposed technique can be used to analyze a reconfigurable periodic structure with any type of switches. For the structure with 24 unit cells considered here, the equivalent circuit model is about five orders of magnitude faster than full-wave simulations.

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Planar negative refractive index media using periodically L-C loaded transmission lines

Cited by 1,283 publications

References 13 publications

Implementation of a Microstrip Square Planar <formula formulatype="inline"><tex Notation="TeX">$N$</tex></formula>-Way Metamaterial Power Divider

Implementation of a Microstrip Square Planar <formula formulatype="inline"><tex Notation="TeX">$N$</tex></formula>-Way Metamaterial Power Divider

Compact Dual-Wideband Bandpass Filter Using CSRR Based Extended Right/Left-Handed Transmission Line

Equivalent-Circuit Models for Efficient Transmission and Dispersion Analyses of Multi-State Periodic Structures

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