CRLH metamaterial leaky-wave and resonant antennas

Caloz, Christophe; Itoh, T.; Rennings, Andreas

doi:10.1109/map.2008.4674709

Cited by 319 publications

(162 citation statements)

References 34 publications

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“…Large isolation is achieved with this design, especially around the nulls of radiation of the unmodulated case, which are shifted by the applied modulation. Better performance in this operation without frequency conversion is expected for more directive beamwidths, which may be achieved with a longer line, and using leaky-wave antennas that are based on zeroth-order diffraction, such as composite right-/ left-handed transmission lines (30)(31)(32).…”

Section: Resultsmentioning

confidence: 99%

Breaking temporal symmetries for emission and absorption

Hadad

Soric

Alù

2016

Proc. Natl. Acad. Sci. U.S.A.

256

177

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Time-reversal symmetries impose stringent constraints on emission and absorption. Antennas, from radiofrequencies to optics, are bound to transmit and receive signals equally well from the same direction, making a directive antenna prone to receive echoes and reflections. Similarly, in thermodynamics Kirchhoff's law dictates that the absorptivity and emissivity are bound to be equal in reciprocal systems at equilibrium, e(ω, θ) = a(ω, θ), with important consequences for thermal management and energy applications. This bound requires that a good absorber emits a portion of the absorbed energy back to the source, limiting its overall efficiency. Recent works have shown that weak time modulation or mechanical motion in suitably designed structures may largely break reciprocity and time-reversal symmetry. Here we show theoretically and experimentally that a spatiotemporally modulated device can be designed to have drastically different emission and absorption properties. The proposed concept may provide significant advances for compact and efficient radiofrequency communication systems, as well as for energy harvesting and thermal management when translated to infrared frequencies.

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Section: Resultsmentioning

confidence: 99%

Breaking temporal symmetries for emission and absorption

Hadad

Soric

Alù

2016

Proc. Natl. Acad. Sci. U.S.A.

256

177

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“…A metamaterial is a kind of artificial periodic structure with unique properties, which are not or hardly found in nature [6,7]. As a kind of planar metamaterial, composite right/left handed transmission lines (CRLH-TL) [8] are widely used in antenna and circuit design, since it is easy to fabricate them on standard printed circuit board (PCB) [9]. A hotspot research field is the operation of the antenna at zeroth-order resonance (ZOR), where the wavelength is infinite, so that its operating frequency is independent of its physical size [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…As a kind of planar metamaterial, composite right/left handed transmission lines (CRLH-TL) [8] are widely used in antenna and circuit design, since it is easy to fabricate them on standard printed circuit board (PCB) [9]. A hotspot research field is the operation of the antenna at zeroth-order resonance (ZOR), where the wavelength is infinite, so that its operating frequency is independent of its physical size [8,9]. The ZOR antenna can be designed much smaller than half a wavelength, enabling a very compact size [10,11], or much larger than half a wavelength, in order to reach high directivity [12].…”

Section: Introductionmentioning

confidence: 99%

Meta-Loaded Circular Sector Patch Antenna

Yan¹,

Vandenbosch²

2016

PIER

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Abstract-A circular sector patch antenna loaded with a periodic metamaterial topology is presented. Several shapes of the circular sector patch are analyzed, and the input impedances and radiation patterns are compared. The topology reveals a nearly constant resonant frequency at zeroth-order resonance (ZOR) while the radiation performance approaches the one of the ZOR full circular patch antenna. Compared with rectangular and circular patch antennas, the sector patch offers more tuning possibilities. A matching network can be easily introduced to enhance the impedance bandwidth. Apart from the ZOR characteristics, this topology can also support a quasi-monopolar pattern at multiple modes. A semicircular patch operating at 4.1 GHz together with an impedance matching network and a dual-band semicircular patch antenna are fabricated and measured.

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“…The continuous transition from LH to RH, in the dispersion curve of a CRLH MTM, is called the balanced condition. The periodic structure of CRLH unit cells in the balanced condition leads to a CRLH LWA [1]. The CRLH transmission line can also be bent into a circle to realize a ring antenna [2].…”

Section: Introductionmentioning

confidence: 99%

Modelling of a BST-0.5 Idc With Application in Electronically Scanned CRLH Lwa

Ramezanpour¹,

Nikmehr²,

Poorziad³

2011

PIER B

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Abstract-Modeling of a ferroelectric interdigital capacitor (IDC) and its incorporating in composite right/left-handed (CRLH) unit cells is represented. To evaluate the capacitance of a multi-layered IDC structures, conformal mapping and partial capacitance methods are utilized. Furthermore, the partial displacement method is utilized to calculate the electric field distribution and the its relation in the ferroelectric layer to applied voltage is obtained. Using this relation in a phenomenological model, dependency of the relative permittivity of ferroelectric on the applied voltage is obtained. The designed unit cell is comprised of IDCs and spiral inductors. To alter the propagation constant of the unit cell by varying the applied voltage, a thin layer of Ba 0.5 Sr 0.5 T iO 3 (BST-0.5) ferroelectric is incorporated underneath an IDC, called BST-0.5 varactor. The periodic structure based on the designed unit cell leads to a CRLH LWA. The Tunability of the periodic structure with three unit cell is demonstrated by varying the relative permittivity of the ferroelectric layer.

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CRLH metamaterial leaky-wave and resonant antennas

Cited by 319 publications

References 34 publications

Breaking temporal symmetries for emission and absorption

Breaking temporal symmetries for emission and absorption

Meta-Loaded Circular Sector Patch Antenna

Modelling of a BST-0.5 Idc With Application in Electronically Scanned CRLH Lwa

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