Design and realisation of an electrically small Huygens source for circular polarisation

Alitalo, Pekka; Karilainen, Antti; Niemi, Teemu; Simovski, Constantin; Tretyakov, Sergei

doi:10.1049/iet-map.2010.0524

Cited by 41 publications

(35 citation statements)

References 14 publications

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“…When they oscillate in-phase, the scattered fields are mainly in the direction of the incoming wave, with zero-backward radiated power, ('first Kerker' or 'zero-backward intensity condition') and correspond to an ideal 'Huygens' secondary source 9 . Such sources are interesting as elements of electrically small antennas 10,11 . Correspondingly, at the 'second Kerker condition' (or 'near-zeroforward intensity condition') the dipoles are out-of-phase, ('Huygens reflector'), which opens intriguing applications for metamaterials and cloaking 12 .…”

mentioning

confidence: 99%

Magnetic and electric coherence in forward- and back-scattered electromagnetic waves by a single dielectric subwavelength sphere

et al. 2012

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Magnetodielectric small spheres present unusual electromagnetic scattering features, theoretically predicted a few decades ago. However, achieving such behaviour has remained elusive, due to the non-magnetic character of natural optical materials or the difficulty in obtaining low-loss highly permeable magnetic materials in the gigahertz regime. Here we present unambiguous experimental evidence that a single low-loss dielectric subwavelength sphere of moderate refractive index (n ¼ 4 like some semiconductors at near-infrared) radiates fields identical to those from equal amplitude crossed electric and magnetic dipoles, and indistinguishable from those of ideal magnetodielectric spheres. The measured scattering radiation patterns and degree of linear polarization (3-9 GHz/33-100 mm range) show that, by appropriately tuning the a/l ratio, zero-backward ('Huygens' source) or almost zeroforward ('Huygens' reflector) radiated power can be obtained. These Kerker scattering conditions only depend on a/l. Our results open new technological challenges from nanoand micro-photonics to science and engineering of antennas, metamaterials and electromagnetic devices.

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confidence: 99%

Magnetic and electric coherence in forward- and back-scattered electromagnetic waves by a single dielectric subwavelength sphere

et al. 2012

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“…In order to address this issue, several ways of developing directive ESAs have been proposed. These ways, for instance, include: using electrically small reflectors [3][4][5] or directors [6], associating with ground plane [7,8], arranging ESA elements in linear array [9], and constructing Huygens source antennas [10][11][12]. On the other hand, it well known that circularly polarized (CP) radiation has been used to combat multi-path interferences or fading, mitigate polarization mismatch losses, and reduce Faraday rotation effects caused by the ionosphere.…”

Section: Introductionmentioning

confidence: 99%

Electrically-Small Circularly-Polarized Quasi-Yagi Antenna

Ta¹

2018

PIER Letters

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Abstract-In this letter, an electrically-small circularly polarized (CP) quasi-Yagi antenna is presented. It is composed of three elements; i.e., a compact single-feed crossed-dipole antenna acted as the driver and two parasitic elements acted as the reflector and director, respectively. Each arm of all elements contains a meander line with an arrowhead ending to realize compactness. The driver has double vacant-quarter printed rings incorporated into it to generate the CP radiation. The parasitic elements are incorporated with the crossed-dipole driver to not only produce a directive radiation, but also broaden the antenna bandwidth. The final design with overall size of 35 mm × 35 mm × 27 mm (0.184λ o × 0.184λ o × 0.142λ o at 1.575 GHz, ka = 0.93) a measured 10-dB bandwidth of 19.23% (1.476-1.790 GHz), 3-dB axial ratio bandwidth of 7.67% (1.505-1.625 GHz), a broadside gain of 3.0 ± 0.2 dBic, and the maximum front-to-back ratio of 8.2 dB. The proposed antenna is applicable to a variety of wireless system operating near 1.575 GHz, such as Global Positioning Systems, Global Navigation Satellite Systems, as well as international maritime satellite organization (Inmarsat) networks.

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“…With proper spatial alignment, a unidirectional beam with up to 4.8 dBi gain can be produced, while using simple antenna shapes [2][3][4]. This comes from the fact that although a monopole/dipole and a loop produce almost the same pattern shape, their polarization is orthogonal.…”

Section: Introductionmentioning

confidence: 99%

“…Although the proposed work is larger and more bulky than the CP antennas presented in [3][4], it offers a much greater degree of pattern reconfiguration. …”

Section: Introductionmentioning

confidence: 99%

Towards circularly polarized reconfigurable huygens source

Narbudowicz

Ammann²,

Heberling

2015

2015 IEEE International Symposium on Antennas and Propagation &Amp; USNC/URSI National Radio Science Meeting

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Abstract-The paper investigates an array of two reconfigurable circularly-polarized antennas with omnidirectional radiation pattern. The results are based on a previously reported antenna, which offers a steerable dipolelike radiation pattern. Its capabilities allow reception of a signal from practically any direction with steering realized by rotation of the pattern around a single axis. In this paper we propose to extend this functionality by forming an array of two such antennas oriented as a Huygens source. Simulations demonstrate six distinctive radiation patterns, each illuminating a different sector of the surrounding sphere. This allows increased antenna gain and simplification of the steering algorithm for future applications. The proposed antenna can be implemented for both MIMO and beamsteering.

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Design and realisation of an electrically small Huygens source for circular polarisation

Cited by 41 publications

References 14 publications

Magnetic and electric coherence in forward- and back-scattered electromagnetic waves by a single dielectric subwavelength sphere

Magnetic and electric coherence in forward- and back-scattered electromagnetic waves by a single dielectric subwavelength sphere

Electrically-Small Circularly-Polarized Quasi-Yagi Antenna

Towards circularly polarized reconfigurable huygens source

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