A Focused Planar Microstrip Array for 2.4 GHz RFID Readers

Buffi, Alice; Serra, Andrea; Nepa, Paolo; Chou, Hsi‐Tseng; Manara, Giuliano

doi:10.1109/tap.2010.2044331

Cited by 203 publications

(107 citation statements)

References 18 publications

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“…The phase of the feeding currents has been adjusted to maximize the radiated field at a distance Ro=40 cm (7.73λo) from the antenna aperture. For the NFfocused phased array, the phase shift for the i th element can be calculated from [11] …”

Section: ×8 Dielectric Resonator Antenna Elements (4×4 Sub-arrays)mentioning

confidence: 99%

“…NF-Focusing is used in RFID to increase the field incident on the tags at allowed effective isotropic radiated power (EIRP) kept constant [11]. Dielectric resonator antennas (DRAs) have attracted broad attention in many applications due to their many attractive features in terms of high radiation efficiency, wide bandwidth, light weight, small size and low profile [12].…”

Section: Introductionmentioning

confidence: 99%

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Near-Field Focusing Dielectric Resonator Antenna Array for Fixed RFID Readers

Saber¹,

Hend²,

Kamal³

2011

Int. j. radio freq. identify. wirel. sens. netw.

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Section: ×8 Dielectric Resonator Antenna Elements (4×4 Sub-arrays)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Near-Field Focusing Dielectric Resonator Antenna Array for Fixed RFID Readers

Saber¹,

Hend²,

Kamal³

2011

Int. j. radio freq. identify. wirel. sens. netw.

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“…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

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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.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Sharma

Zuazola

Martínez

et al. 2014

Antennas Wirel. Propag. Lett.

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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.

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A Focused Planar Microstrip Array for 2.4 GHz RFID Readers

Cited by 203 publications

References 18 publications

Near-Field Focusing Dielectric Resonator Antenna Array for Fixed RFID Readers

Near-Field Focusing Dielectric Resonator Antenna Array for Fixed RFID Readers

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

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

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