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Chao Qin

Bio: Chao Qin is an academic researcher from University of Wisconsin-Madison. The author has contributed to research in topics: Metamaterial & Split-ring resonator. The author has an hindex of 3, co-authored 5 publications receiving 25 citations.

Papers
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Journal ArticleDOI
TL;DR: A range of novel phenomena including partial focusing and splitting into multiple transmitted beams are observed and it is demonstrated that while some of these experimentally observed effects can be described within the approximation of an effective medium, a deeper understanding of the experimental results requires a rigorous study of internal eigenmodes of the lattice of resonators.
Abstract: We study experimentally propagation of electromagnetic waves through a slab of uniaxial magnetic metamaterial. We observe a range of novel phenomena including partial focusing and splitting into multiple transmitted beams. We demonstrate that while some of these experimentally observed effects can be described within the approximation of an effective medium, a deeper understanding of the experimental results requires a rigorous study of internal eigenmodes of the lattice of resonators.

12 citations

Journal ArticleDOI
TL;DR: In this paper, the design, microfabrication, and characterization of V-band transmission lines, having a wide left-handed passband between 42 and 73 GHz, was presented.

10 citations

Proceedings ArticleDOI
03 Jun 2007
TL;DR: In this paper, a mushroom-type left-handed transmission line constructed using a microfabrication method was reported, which also yields new opportunities to reduce the structure dimensions, and consequently increase the operating frequency.
Abstract: We report a mushroom-type left-handed transmission line constructed using a microfabrication method, which also yields new opportunities to reduce the structure dimensions, and consequently, increase the operating frequency. Comprehensive characterization using both S-parameter measurement and full wave electromagnetic simulation shows a wide left-handed pass band between 37 and 60 GHz.

4 citations

Proceedings ArticleDOI
17 Jun 2007
TL;DR: In this article, the excitation of magnetoinductive waves in uniaxial composite metamaterial structures composed of split-ring resonators (SRRs) was studied both theoretically and experimentally.
Abstract: This paper studies both theoretically and experimentally, the excitation of magnetoinductive waves in uniaxial composite metamaterial structures composed of split-ring resonators (SRRs). A slab of a magnetic metamaterial is excited by a monopole antenna and analyse the beam structure behind the slab. Though the scale of the composite constituents are much smaller then the wavelength of radiation, the approximation based on an effective medium fails to describe all observed effects, including the multiple beam splitting. A numerical algorithm is developed for describing the lattices of SRRs in terms of interacting dipoles, and confirm qualitatively the effects observed in experiment.
Proceedings ArticleDOI
09 Jun 2007
TL;DR: In this paper, the authors investigate both theoretically and experimentally, the situation that exists when magnetoinductive waves are efficiently generated in uniaxial composite metamaterial structures composed of SRRs.
Abstract: In this paper, we investigate both theoretically and experimentally, the situation that exists when magnetoinductive waves are efficiently generated in uniaxial composite metamaterial structures composed of SRRs. We excite a slab of a magnetic metamaterial using a monopole antenna and analyze the beam structure behind the slab. Although the scale of the composite constituents are much smaller then the wavelength of radiation, we observe that an approximation based on an effective medium fails to describe all observed effects, including the multiple beam splitting. We develop a numerical algorithm for describing the lattices of SRRs in terms of interacting dipoles, and confirm qualitatively the effects observed in experiments.

Cited by
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Journal ArticleDOI
TL;DR: In this paper, a double periodic composite right/left-handed (CRLH) substrate integrated waveguide (SIW) is proposed based on the transmission line theory, and a new leaky-wave radiation is observed at low frequency below the left-handed passband.
Abstract: A double periodic composite right/left-handed ( DP-CRLH ) substrate integrated waveguide (SIW) is proposed based on the transmission line theory. A new leaky-wave radiation is observed at low frequency below the left-handed passband in addition to the composite right/left-handed property. First, the equivalent circuit of the proposed structure is analyzed, and dispersion characteristics are obtained including the expression for the cutoff frequencies. It is noted that transmission lines double periodically loaded with either alternate capacitances, or alternate inductances will contribute the new leaky-wave behavior. Next, SIW implementation of a DP-CRLH transmission line is designed and illustrated with simulated and experimentally demonstrated results. The electric field distribution plots are extracted from a full-wave simulation tool and exhibit the forward and backward wave propagation in the new leaky-wave region and the typical left-handed region, respectively. Finally, a compact leaky-wave antenna based on the DP-CRLH SIW is designed, and the radiation characteristics are tested and demonstrated to exhibit forward radiation at the new leaky-wave region from 5.2 to 5.8 GHz (covering IEEE 802.11a band) and frequency scanning from backward to forward directions in the left-handed and conventional right-handed region from 12.6 to 17.8 GHz.

87 citations

Journal ArticleDOI
TL;DR: In this article, a review of the nonlinear left-handed metamaterials (LHMs) is presented, where the authors consider a model system that combines nonlinearity (dependence of the permittivity and permeability on the magnitude of the propagating field) with the anomalous dispersion exhibited by LHM.
Abstract: Metamaterials, exhibiting simultaneously negative permittivity e and permeability μ, more commonly referred to as left-handed metamaterials (LHMs) and also known as negative-index materials, have received substantial attention in the scientific and engineering communities [1]. Most studies of LHMs (and electromagnetic metamaterials in general) have been in the linear regime of wave propagation and have already inspired new types of microwave circuits and devices. The results of these studies have already been the subject of numerous reviews and books.This review covers a less explored but rapidly developing area of investigation involving media that combine nonlinearity (dependence of the permittivity and permeability on the magnitude of the propagating field) with the anomalous dispersion exhibited by LHM. The nonlinear phenomena in such media will be considered on the example of a model system: the nonlinear left-handed transmission line. These nonlinear phenomena include parametric generation and amplification, harmonic and subharmonic generation as well as modulational instabilities and envelope solitons.

72 citations

Journal ArticleDOI
TL;DR: In this paper, a review of recent developments in magnetic plasmonics arising from the coupling effect in metamaterials is given, where it is shown that the coupling between these units produces multiple discrete resonance modes due to hybridization.
Abstract: Magnetic metamaterials consist of magnetic resonators smaller in size than their excitation wavelengths. Their unique electromagnetic properties were characterized by the effective media theory at the early stage. However, the effective media model does not take into account the interactions between magnetic elements; thus, the effective properties of bulk metamaterials are the result of the “averaged effect” of many uncoupled resonators. In recent years, it has been shown that the interaction between magnetic resonators could lead to some novel phenomena and interesting applications that do not exist in conventional uncoupled metamaterials. In this paper, we will give a review of recent developments in magnetic plasmonics arising from the coupling effect in metamaterials. For the system composed of several identical magnetic resonators, the coupling between these units produces multiple discrete resonance modes due to hybridization. In the case of a system comprising an infinite number of magnetic elements, these multiple discrete resonances can be extended to form a continuous frequency band by strong coupling. This kind of broadband and tunable magnetic metamaterial may have interesting applications. Many novel metamaterials and nanophotonic devices could be developed from coupled resonator systems in the future. (© 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

71 citations

Journal ArticleDOI
TL;DR: In this article, an artificial transmission line unit cell is presented based on the so-called composite right/left handed transmission line, implemented on a microelectromechanical system process on glass, and is suitable for applications such as reconfigurable leaky-wave antennas and series feed networks.
Abstract: An artificial transmission line unit cell is presented based on the so-called composite right/left handed transmission line. It is implemented on a microelectromechanical system process on glass, and is suitable for applications such as reconfigurable leaky-wave antennas and series feed networks. The device presents state-of-the-art performance in terms of differential phase shift over losses (38deg/dB at 14 GHz) and quasi-zero drive power consumption. It is monolithic and has a total footprint of 4 mm2.

32 citations

Journal ArticleDOI
TL;DR: In this article, the role played by the longitudinal and transverse coupling effects in the electromagnetic properties of stacked split ring resonator (SRR) arrays operating at microwave frequencies was investigated.
Abstract: We report on free space transmission experiments carried out on stacked split ring resonator (SRRs) arrays operating at microwave frequencies. We start from the case of a single frequency selective surface which exhibits a rejection at the SRR resonance frequency. By stacking SRR arrays in the propagation direction, we then show experimentally the possibility to induce a transmission band just below this resonance frequency. Full wave analysis shows the role played by the longitudinal and transverse coupling efiects in the electromagnetic properties of such bulk metamaterials, with the appearance of a transmission band resulting from an artiflcial magnetic activity.

18 citations