Electrically small supergain end‐fire arrays

Yaghjian, Arthur D.; O'Donnell, T.H.; Altshuler, E.E.; Best, Steven

doi:10.1029/2007rs003747

Cited by 126 publications

(119 citation statements)

References 41 publications

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“…Moreover, the fact that significantly different responses are obtained with numerically similar coefficients emphasizes the stringent fabrication tolerances associated with the construction of superdirective devices [45].…”

Section: Theorymentioning

confidence: 99%

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Superbackscattering nanoparticle dimers

et al. 2015

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The theory and design of superbackscattering nanoparticle dimers are presented. We analytically derive the optimal configurations and the upper bound of their backscattering cross-sections. In particular, it is demonstrated that electrically small nanoparticle dimers can enhance the backscattering by a factor of 6.25 with respect to single dipolar particles. We demonstrate that optimal designs approaching this theoretical limit can be found by using a simple circuit model. The study of practical implementations based on plasmonic and high-permittivity particles reveal that fourfold enhancement factors might be attainable even with realistic losses.

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Section: Theorymentioning

confidence: 99%

“…Following a similar philosophy, the present work investigates the design of superbackscattering nanoparticle dimers. These geometries have been selected in view of previous positive experiences with two-element superdirective antenna arrays [44][45][46][47] and plasmonic dimers [48].…”

Section: Introductionmentioning

confidence: 99%

Superbackscattering nanoparticle dimers

et al. 2015

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“…Detailing the current behaviors, it was found that as the frequencies were made to overlap, the currents became more out of phase to achieve the high FTBR. Consequently, it was decided to try shorting out one element, as one would for achieving high directivity with an end-fire array [4][5][6][7][8].…”

Section: D Magnetic Ez Antennamentioning

confidence: 99%

“…These include, for example, end-fire arrays [5][6][7][8], electromagnetic band-gap (EBG) structures [9], high impedance surfaces and artificial magnetic conductors [10][11][12][13], nearfield resonant parasitic (NFRP) elements [14][15][16], nonFoster circuit-augmented antennas [17], two-element NFRP antenna arrays [18,19], and Huygens sources [20][21][22][23][24][25]. The metamaterial-inspired NFRP antenna designs have led to the realization of many performance enhancements of compact systems.…”

Section: Introductionmentioning

confidence: 99%

The directivity of a compact antenna: an unforgettable figure of merit

Ziolkowski

2017

EPJ Appl. Metamat.

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Abstract. When an electrically small antenna is conceived, designed, simulated, and tested, the main emphasis is usually placed immediately on its impedance bandwidth and radiation efficiency. All too often it is assumed that its directivity will only be that of a Hertzian dipole and, hence, its directivity becomes a minor consideration. This is particularly true if such a compact antenna radiates in the presence of a large ground plane. Attention is typically focused on the radiator and its size, while the ground plane is forgotten. This has become a too frequent occurrence when antennas, such as patch antennas that have been augmented with metamaterial structures, are explored. In this paper, it is demonstrated that while the ground plane has little impact on the resonance frequency and impedance bandwidth of patch antennas or metamaterial-inspired three-dimensional magnetic EZ antennas, it has a huge impact on their directivity performance. Moreover, it is demonstrated that with both a metamaterialinspired two-element array and a related Huygens dipole antenna, one can achieve broadside-radiating electrically small systems that have high directivities. Several common and original designs are used to highlight these issues and to emphasize why a fundamental figure of merit such as directivity should never be overlooked.

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“…The commonly used first-order probes for spherical nearfield antenna measurements are conical horns fed by a circular waveguide operating in the fundamental TE 11 -mode regime. The waveguides are made long enough so that they function as effective filters for higher-order modes inevitably excited at their feed section.…”

mentioning

confidence: 99%

Superdirective Magnetic Dipole Array as a First-Order Probe for Spherical Near-Field Antenna Measurements

Kim

Pivnenko

Breinbjerg

2012

IEEE Trans. Antennas Propagat.

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Abstract-The theory as well as numerical and experimental results are presented for a superdirective array composed of closely spaced electrically small resonant magnetic dipole elements. The array operates on a metal ground plane and can exhibit a maximum directivity of 11.5 dBi, 15.2 dBi, and 17.8 dBi (including 3 dB due to the ground plane), for 2, 3, and 4 magnetic dipoles, respectively. The array is self-resonant and is directly excited by a 50-ohm coaxial cable through the ground plane. The array radiates essentially the |µ| = 1 spherical modes, which, despite a narrow bandwidth, makes it an excellent firstorder probe for spherical near-field antenna measurements at low frequencies.Index Terms-Electrically small antennas, supergain array, superdirectivity, magnetic dipole, spherical near-field antenna measurements, first-order probe

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Electrically small supergain end‐fire arrays

Cited by 126 publications

References 41 publications

Superbackscattering nanoparticle dimers

Superbackscattering nanoparticle dimers

The directivity of a compact antenna: an unforgettable figure of merit

Superdirective Magnetic Dipole Array as a First-Order Probe for Spherical Near-Field Antenna Measurements

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