An architecture for active metamaterial particles and experimental validation at RF

Popa, Bogdan Ioan; Cummer, Steven A.

doi:10.1002/mop.22789

Cited by 34 publications

(28 citation statements)

References 16 publications

(18 reference statements)

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“…Using the architecture described in 10 and employed in 12 , we design a structure composed of arrays of the identical unit cells presented in Figure 1(b). The cell consists of a loop excited by the magnetic field in the incident wave and a monopole (the T-shaped element) that interacts with the electric field.…”

Section: Non-reciprocal Active Metamaterialsmentioning

confidence: 99%

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Nonreciprocal active metamaterials

Popa

Cummer

2012

Phys. Rev. B

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We show experimentally that active electromagnetic metamaterials are suitable for the implementation of a large class of non-reciprocal media characterized by magneto-electric constitutive parameters that cannot be achieved in passive materials. We design, fabricate and characterize an isolator made of such an active metamaterial slab and show that it is essentially transparent to microwaves propagating in one direction and opaque in the opposite direction.

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Section: Non-reciprocal Active Metamaterialsmentioning

confidence: 99%

“…This began with external tunability of a resonant response 1-6 and has since moved into new areas such as enhanced nonlinear behavior [7][8][9] and externally powered active metamaterials [10][11][12][13] . Integrating external power into metamaterials is recognized to enable material properties that do not exist in their passive counterparts, such as gain.…”

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confidence: 99%

Nonreciprocal active metamaterials

Popa

Cummer

2012

Phys. Rev. B

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“…Active metamaterials (i.e., metamaterials formed by introducing gain devices such as transistors or operational amplifiers into their inclusions and, hence, unit cells) for RF frequencies have been designed by a team at Duke [122]. These principles have been used by them to realize lossless magnetic [123] and non-reciprocal [124] microwave metamaterials.…”

Section: Active and Extreme Contributionsmentioning

confidence: 99%

Metamaterials: The early years in the USA

Ziolkowski

2014

EPJ Appl. Metamat.

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-Metamaterials are artificial materials formed by embedding highly subwavelength inclusions in a host medium, which yield homogenized permittivity and permeability values. By design they offer the promise of exotic physics responses not generally available with naturally occurring materials, as well as the ability to tailor their properties to specific applications. The initial years of discovery emphasized confirming many of their exotic properties and exploring their actual potential for science and engineering applications. These seed efforts have born the sweet fruit enjoyed by the current generation of metamaterials scientists and engineers. This review will emphasize the initial investigative forays in the USA that supported and encouraged the development of the metamaterials era and the subsequent recognition that they do have significant advantages for practical applications.

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“…1,2 Based on his research, others have made advances to the study of metamaterials across the electromagnetic spectrum. [3][4][5][6] In, 7 Hand and Cummer use barium strontium titanate thin film capacitors as external components to shift the resonant frequency. For an application example, an invisibility cloak at radio frequencies (RF) diverts signals around an object rendering it undetectable.…”

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confidence: 99%

Low-loss meta-atom for improved resonance response

2012

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Measurements of a meta-atom integrated with a low noise amplifier into the split-ring resonator are presented. A comparison is made between baseline meta-atoms and one integrated with a GaAs low noise amplifier. S-parameter measurements in a RF strip-line show the resonant frequency location. The resonance null is more prominent for the integrated meta-atom. Biasing the low noise amplifier from 0 to 7 VDC showed that the resonant null improved with biasing voltage. As the biasing voltage increases, the transmission null reduced from -11.82 to -23.21 dB for biases from 0 to 7 VDC at resonant frequency

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An architecture for active metamaterial particles and experimental validation at RF

Cited by 34 publications

References 16 publications

Nonreciprocal active metamaterials

Nonreciprocal active metamaterials

Metamaterials: The early years in the USA

Low-loss meta-atom for improved resonance response

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