Periodically loaded transmission line with effective negative refractive index and negative group velocity

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

doi:10.1109/aps.2003.1217561

Cited by 47 publications

(37 citation statements)

References 23 publications

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“…Several experiments confirmed the physical existence of the superluminal and NGD phenomena with negative refractive index media [32][33][34][35][36][37]. In the presence of losses, the NGD generated by NGD passive media is accompanied by excessive losses [15][16][38][39][40]. So, the applications are still limited in low frequencies.…”

Section: Introductionmentioning

confidence: 93%

“…The first experimental verification of this NGV phenomenon was performed in 1982, by Chu and Wong by using laser pulses propagating a GaP:N sample as shown in [8]. To verify the existence and illustrate the significance of this extraordinary phenomenon, many theoretical and experimental demonstrations were performed [8][9][10][11][12][13][14][15][16]. This counterintuitive phenomenon was explained from the pulse reshaping because of constructive and destructive interferences in the frequency band of anomalous dispersion.…”

Section: Introductionmentioning

confidence: 99%

“…This counterintuitive phenomenon was explained from the pulse reshaping because of constructive and destructive interferences in the frequency band of anomalous dispersion. In this region, it was shown several times, that the group refractive index ) (ω g n can become negative [12][13][14][15][16][17][18]. In this case, the group velocity, which is defined as:…”

Section: Introductionmentioning

confidence: 99%

“…It was stated that the NGD effect does not contradict the causality principle [19][20][21][22][23][24][25][26]. In addition, the left-handed (LH) lumped passive circuit capable to generate NGD effect for microwave signals up to GHz has been introduced by the group of Mojahedi [15][16]. The topology of this circuit was established from the 1D metamaterials modelling of the array split ring resonators having simultaneously negative permittivity and negative permeability.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

Ravelo

2013

AEM

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This paper focus is on the neutralization technique of the unwanted parasitic effects on radio frequencies (RF) and digital electronic circuits. Most of parasitic effects induced in these circuits can be modeled by RC-and LC-networks. For canceling these disturbing effects, we can proceed with operation as transfer function neutralization in the considered operating frequency bands. The neutralization presented in this paper is developed by using first, a lefthanded (LH) and negative group delay (NGD) circuits inspired from metamaterials. The theoretical approach illustrating the RC-and LC-effects neutralization is described. Synthesis relations enabling to determine the elements of required LH and NGD circuit correctors in function of the perturbation parameters are established. Numerical and experimental demonstrators are presented to validate the technique proposed.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

Ravelo

2013

AEM

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“…The paper also serves as an introduction to the design and operation of the metamaterialsbased devices [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] which will be analyzed using the proposed method along with their conventional equivalents. We develop a systematic nodal analysis approach based on the Kirchhoff's current rule which is tailored to the high frequency networks by ABCD matrix representation of the circuit branches.…”

Section: Introductionmentioning

confidence: 99%

The Forward Transmission Matrix (Ftm) Method for S-Parameter Analysis of Microwave Circuits and Their Metamaterial Counterparts

Siddiqui¹

2016

PIER B

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Abstract-In classical Electromagnetics textbooks, microwave circuits such as circulators, couplers, and filters are solved by non-systematic approaches such as even-odd mode analysis. Hence an electrical engineering student coming from the conventional circuit theory background encounters difficulties in understanding and solving microwave circuits. In this paper, we propose a modified node voltage analysis method in which the circuit branches are represented by their forward transmission matrices so that the electromagnetic wave propagation is taken care of. The Kirchhoff's current rule, tailored for high frequencies, is applied to formulate the simultaneous node voltage equations which are subsequently solved by matrix inversion. The proposed forward transmission matrix (FTM) method is applied to evaluate the S-parameters of some well-known microwave devices including the recently-developed metamaterial-based circuits. The FTM node analysis is a natural extension of the classical node analysis which is taught in the early stages of an Electrical Engineering program. Hence we anticipate that the proposed method will ease up the conceptual transition of electrical engineering students and academicians from the low-frequency alternating current circuits to high frequency RF and microwave circuits.

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Synthesis of frequency-independent phase shifters using negative group delay active circuit

Ravelo

Pérennec

Roy

2010

Int J RF and Microwave Comp Aid Eng

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This article describes a synthesis method dedicated to the design of frequency-independent phase shifters (PSs). This innovative PS structure consists in a transmission line cascaded with a negative group delay (NGD) active circuit so that the absolute constant group delays generated by both of them are identical but of opposite signs. So, in principle, it exhibits a constant overall phase and a group delay close to zero. Broadband linear positive phase slopes are obtained through use of an NGD active circuit whose characteristics are recalled prior to the extraction of the PS synthesis relations. The design and simulations of a PS of compact size are reported. The experimental results confirm the expected frequency-independent transmission-phase value of 145 6 10 with an insertion gain of 2 6 2 dB over a 160% relative frequency band. At last, future prospects allowed by the specific properties of this PS are presented.

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Periodically loaded transmission line with effective negative refractive index and negative group velocity

Cited by 47 publications

References 23 publications

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

Neutralization of LC- and RC-Disturbances with Left-Handed and NGD Effects

The Forward Transmission Matrix (Ftm) Method for S-Parameter Analysis of Microwave Circuits and Their Metamaterial Counterparts

Synthesis of frequency-independent phase shifters using negative group delay active circuit

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