Phase-agile branch-line couplers using metamaterial lines

Islam, R.; Eleftheriades, George V.

doi:10.1109/lmwc.2004.829277

Cited by 45 publications

(27 citation statements)

References 10 publications

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“…If we define the enhancement of power density at broadside of the antenna as the ratio between its maximum power density radiated at broadside and the power density radiated at broadside by a unit amplitude electric line source in free space [which is equal to ], we have (25) Therefore, the enhancement-fractional-bandwidth product EFBW at broadside is (26) This means that, by letting the normalized attenuation constant have small values (e.g., through the use of thick slabs), a large radiated power density at broadside (25) can be obtained, but at the expense of having a very small fractional bandwidth (24). Note that the enhancement factor increases as decreases, though the bandwidth FBW decreases even faster.…”

Section: A Leaky-wave Explanation Of the Optimum Radiation Conditionmentioning

confidence: 99%

Analysis of Directive Radiation From a Line Source in a Metamaterial Slab With Low Permittivity

Lovat

Burghignoli

Capolino

et al. 2006

IEEE Trans. Antennas Propagat.

167

120

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Section: A Leaky-wave Explanation Of the Optimum Radiation Conditionmentioning

confidence: 99%

Analysis of Directive Radiation From a Line Source in a Metamaterial Slab With Low Permittivity

Lovat

Burghignoli

Capolino

et al. 2006

IEEE Trans. Antennas Propagat.

167

120

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“…This is more than a 70% reduction in size when compared to the branch-line coupler using microstrip lines with the same substrate setup. The overall size reduction is comparable to the branch-line couplers using composite right/left-handed (CRLH) metamaterial transmission lines [27], [28]. The full-wave simulation results of a microstrip branch-line coupler and a miniaturized EBG-based coupler are shown in Fig.…”

Section: B Design Examples As a Branch-line Coupler Based On The Quamentioning

confidence: 94%

Design Considerations of Miniaturized Least Dispersive Periodic Slow-Wave Structures

Zhou

Yang

2008

IEEE Trans. Microwave Theory Techn.

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Abstract-Slow-wave structures using distributed periodic inductive and capacitive loadings have found many microwave circuit applications as left-handed (bandpass) or right-handed (lowpass) transmission lines. A large slow-wave factor (SWF) could result in a much smaller passive component, but also a much lower bandgap (cutoff) frequency and a larger dispersion. This paper addresses the issues and the design tradeoff between the SWF, group delay (dispersion), and the cutoff frequency of a right-handed (lowpass) quasi-lumped transmission line. A new two-layer transmission line structure using 3-D substrate metallization with an SWF of 5.8 is designed. A prototype of a 3-GHz branch-line coupler with a 70% size reduction using such a transmission line structure is fabricated and tested.Index Terms-Branch-line coupler, dispersion, electromagnetic bandgap (EBG), periodic structures, slow wave.

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“…Since the early 2000s, various microwave engineering applications of the LH concept have been proposed in the literature [65][66][67][68]. So, innovative microwave devices (filter, antenna, power divider, coupler…) were designed [65][66][67][68].…”

Section: Lc-effect Cancellation With Lh Active Circuitsmentioning

confidence: 99%

“…So, innovative microwave devices (filter, antenna, power divider, coupler…) were designed [65][66][67][68]. At the beginning, the LH-circuits were inspired thanks to the analogy with the metamaterials susceptible to operate with negative phase-and/or group-velocities [69][70][71].…”

Section: Lc-effect Cancellation With Lh Active Circuitsmentioning

confidence: 99%

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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Phase-agile branch-line couplers using metamaterial lines

Cited by 45 publications

References 10 publications

Analysis of Directive Radiation From a Line Source in a Metamaterial Slab With Low Permittivity

Analysis of Directive Radiation From a Line Source in a Metamaterial Slab With Low Permittivity

Design Considerations of Miniaturized Least Dispersive Periodic Slow-Wave Structures

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

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