Time-Domain Measurement of Negative Group Delay in Negative-Refractive-Index Transmission-Line Metamaterials

Siddiqui, Omar; Erickson, S.J.; Eleftheriades, George V.; Mojahedi, Mo

doi:10.1109/tmtt.2004.827018

Cited by 92 publications

(82 citation statements)

References 20 publications

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“…The negative index behavior of this medium was later corroborated by an experiment in which a wave was shown to refract negatively at the interface between this structure and air [5]. This work led to an eruption of papers on the topic of LHMs [6][7][8][9][10]. In general, the transmission magnitude for propagation through a medium is used to determine whether the medium is LHM or not.…”

Section: Introductionmentioning

confidence: 84%

Determining the sign of the index in metamaterials composed of split ring resonators and strip wires using dispersion diagrams or the insertion phase

2005

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Using full wave simulations the behavior of two structures composed of split ring resonators (SRRs) and strip wires (SWs) is examined. In the region where the real parts of the permittivity and permeability are both expected to be negative both structures exhibit a transmission peak, a property which is generally assumed to imply a negative index of refraction. However, through an analysis of the dispersion characteristics and insertion phase of the two structures it is shown that only the index in the first structure, in which the SRRs and SWs are printed on opposite sides of a dielectric substrate, is negative in the passband. In the second structure, in which SRRs and SWs are printed on the same side of the substrate, the index in the passband is positive. Therefore the emergence of transmission peaks does not provide sufficient evidence of the existence of a negative index of refraction. To determine the correct sign of the index two methods are investigated. The first uses the transmission phase for propagation through various lengths of the structure and the second utilizes its dispersion diagrams. The dependence of the sign of the index on the dimensions of the unit cell size is also examined.

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Section: Introductionmentioning

confidence: 84%

Determining the sign of the index in metamaterials composed of split ring resonators and strip wires using dispersion diagrams or the insertion phase

2005

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“…It was pointed up by many research works that with NGD passive devices [30][31][32][33], the apparition of the NGD is generally accompanied with excessive losses in the operating frequency band. To compensate the losses, an active electronic topology is herein deeply investigated.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, the main roadblock of this application for the numerous high speed submicron systems that such a topology is limited to some MHz. Hence, passive microwave NGD lumped circuits, capable to operate up to GHz, have been proposed by the groups of Lucyszyn [30], Broomfield [31] and of Eleftheriades [32][33]. But, due to the excessive inherent losses and the narrow bandwidth systematically associated to the generation of significant NGD value, this circuit is inoperable in many electronic systems.…”

Section: Introductionmentioning

confidence: 99%

Demonstration of negative signal delay with short-duration transient pulse

Ravelo

2011

Eur. Phys. J. Appl. Phys.

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“…According to a wide and rich discussion in the literature [26][27][28][29][30][31][32][33][34], in this section we use (8) with the measured data of S 21 to study the propagation of the signal reported in (7) in the artificial TL described in Section 3.…”

Section: Analyzed Signalsmentioning

confidence: 99%