Tunable Near-Field Focused Circular Phase-Array Antenna for 5.8-GHz RFID Applications

Siragusa, Romain; Lemaître-Auger, Pierre; Tedjini, Smaïl

doi:10.1109/lawp.2011.2108632

Cited by 70 publications

(35 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As we consider distances of F between 0.4 to 2 m, according to [9], the focus is in the far-field of each dipole element. Therefore the E-field vector of every dipole in isolation can be expressed using a local spherical coordinate system [10]:…”

Section: A the 3-d Vector Projection -Analytical Modelmentioning

confidence: 99%

“…In rectangularly-configured arrays [4], this can be performed by phase shifts between the array elements, but since one phase shifter per element is required, the feeding network becomes complex. In contrast, a circularly-configured array [9] offers a reduced complexity since all the array elements of a circle are equidistant from the focus, and therefore, only one phase shifter per circle is required. In [9] a NF Focused Circular Array (NF-FCA) antenna for 5.8GHz RFID applications consisting of 24 radially oriented array elements (planar printed dipoles) distributed along the periphery of 3 concentric circles (8 elements per circle) was presented.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, a circularly-configured array [9] offers a reduced complexity since all the array elements of a circle are equidistant from the focus, and therefore, only one phase shifter per circle is required. In [9] a NF Focused Circular Array (NF-FCA) antenna for 5.8GHz RFID applications consisting of 24 radially oriented array elements (planar printed dipoles) distributed along the periphery of 3 concentric circles (8 elements per circle) was presented. The appropriate phase distribution of the circles confined the radiated energy to the focus.…”

Section: Introductionmentioning

confidence: 99%

“…The appropriate phase distribution of the circles confined the radiated energy to the focus. In this paper, the antenna presented in [9], hereby defined as the initial design, is optimized for an enhanced focalization. In Section II-A, the E-fields generated by each dipole of the array are modelled analytically in a 3-D coordinate system.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimal E-Field Vector Combination for a Highly Focused Antenna-Array

Sharma

Zuazola

Martínez

et al. 2014

Antennas Wirel. Propag. Lett.

View full text Add to dashboard Cite

This is an accepted pre-published version of this paper. © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. AbstractA near-field highly focused circular phased-array antenna for 5.8 GHz Radio Frequency IDentification (RFID) applications is presented. The Electric field (E-field) at the focus is enhanced by a constructive vector combination in a three dimensional (3-D) coordinate system. The array dipoles of the antenna are oriented to enhance the energy confinement at the focus, and the radii of the circular array is optimized for lower sidelobe levels. As a result, the proposed design achieves an enhanced focalization of ≈ 4dB with reduced sidelobe levels of ≈ 12dB compared to earlier designs.

show abstract

Section: A the 3-d Vector Projection -Analytical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimal E-Field Vector Combination for a Highly Focused Antenna-Array

Sharma

Zuazola

Martínez

et al. 2014

Antennas Wirel. Propag. Lett.

View full text Add to dashboard Cite

show abstract

“…Leaky-wave lens is another type of well-studied configuration to achieve near-field focusing [9][10][11]. Many researchers take advantage of planar antenna array (composed of microstrip elements, for instance) to achieve focusing in the near-zone [12][13][14][15][16][17][18][19][20]. Compared to the above methods, retro-reflective beamforming technique focuses electromagnetic fields with the aid of pilot signal such that the focal point coincides with the location from which the pilot signal is broadcasted, thus is more suitable for wireless power transmission applications [3,21,22].…”

Section: Introductionmentioning

confidence: 99%

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Wang¹,

Ruan²,

Lu³

2016

PIER

View full text Add to dashboard Cite

Abstract-This paper studies the difference between retro-directive beamforming technique and retroreflective beamforming technique in the context of wireless power transmission applications. In all of our studies, a wireless power receiver broadcasts continuous-wave pilot signal; the wireless power transmitter receives and analyzes the pilot signal; finally, the wireless power transmitter transmits continuous-wave power with phase profile conjugate to that of the received pilot signal. Our study demonstrates that a linear equi-spaced antenna array configuration employed by the wireless power transmitter behaves as a retro-directive beamformer when the wireless power receiver resides in the far-zone of the wireless power transmitter, whereas it behaves as a retro-reflective beamformer when the wireless power receiver is not in the far-zone. This paper further investigates two types of array configurations other than linear equi-spaced array when the wireless power transmitter behaves as a retro-reflective beamformer. One is a V-shaped array, which is obtained by deforming the linear equi-spaced array to a "V" shape. The other is termed "perturbed array:" on the basis of linear equi-spaced array, all the elements' locations are perturbed randomly. It is particularly interesting to compare the equi-spaced array and perturbed array. When the wireless power receiver resides 5 or 6 wavelengths away, a 6-element equi-spaced array and a 6-element perturbed array produce the same power level at the near-zone focal point, but the maximum far-zone gain associated with the perturbed array is 1 dB lower than the equi-spaced array. All the conclusions drawn in this paper are supported by numerical results as well as experimental results.

show abstract

Impact of amplitude weights on power focusing for near-field-focused planar arrays

Wang

Gao

et al. 2018

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

Near‐field‐focused (NFF) arrays have gained great interest owing to its ability to focus the electromagnetic power at a point near to the antenna. The power focusing can basically be reflected by the sidelobe level and the area of the −3‐dB focal spot at the focal plane. For an ordinary NFF array with the given phase tapering, it would be an effective way to realize the changing of focused power by controlling the feeding‐current amplitude of the array element. In this article, the effects of the amplitude weights of array element rings on the power focusing with reference to an original NFF array are investigated to address this issue. The focus is on the power focusing changing introduced by amplitude weights changing of element rings, in which different cases of amplitude weights changing are considered. The results from amplitude weights changing are compared with that from an original amplitude weights combination, and compared among those from different cases of amplitude weights changing.

show abstract

Tunable Near-Field Focused Circular Phase-Array Antenna for 5.8-GHz RFID Applications

Cited by 70 publications

References 11 publications

Optimal E-Field Vector Combination for a Highly Focused Antenna-Array

Optimal E-Field Vector Combination for a Highly Focused Antenna-Array

Retro-Directive Beamforming Versus Retro-Reflective Beamforming With Applications in Wireless Power Transmission

Impact of amplitude weights on power focusing for near-field-focused planar arrays

Contact Info

Product

Resources

About