Design of a Near-Field Focused Reflectarray Antenna for 2.4 GHz RFID Reader Applications

Chou, Hsi‐Tseng; Hung, Tso-Ming; Wang, Nannan; Chou, Hsi‐Hsir; Tung, Chia; Nepa, Paolo

doi:10.1109/tap.2010.2103030

Cited by 122 publications

(57 citation statements)

References 17 publications

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“…예를 들어, 그림 20과 같이 컨 베이어 벨트를 타고 움직이는 RFID 태그가 장착된 물건 을 근거리 영역에서 빔을 집중시키는 리더기 안테나를 통해 인식할 수 있다 [37] . 리플렉트어레이를 두 개의 초점 이 존재하는 타원 형태의 반사위상 분포를 갖도록 설계 하면, 이와 같이 근거리에서 빔을 집중시킬 수 있다.…”

Section: -2 Rfid 리더기용 안테나unclassified

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Researches on Microstrip Reflectarray Antennas

Yoon¹

2015

The Journal of Korean Institute of Electromagnetic Engineering

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Microstrip reflectarray is an antenna which controls its radiation pattern with a number of reflective elements. Conventionally, the reflectarray has been researched to replace curved reflector antennas. In this paper, design theories of reflectarray is briefly introduced, and research trends of high gain and broadband reflectarrays are reviewed. To improve the gain of the reflectarrays, it is required that the reflection phase errors on the reflectarray surface be minimized. For this purpose, sufficiently wide reflection phase range and low phase sensitivity should be realized with the designed element. For bandwidth improvement, the reflection phase of the element should be linear with the frequency variation. In this paper, various researches to improve the reflection phase characteristics of the element for high gain and broadband reflectarrays, such as multi-layer and single-layer multi-resonant structures, are reviewed. Also, dual-reflectarray configuration for compact antenna design is reviewed. Finally, various applications of reflectarrays such as contoured beam, near-field focusing, and RCS reduction are reviewed.

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Section: -2 Rfid 리더기용 안테나unclassified

“…21. Reflectarray with ellipsoidal reflection phase distribution for the realization of two foci [37] . .…”

Section: 그림 20 근거리에서 빔을 집중시키는 안테나를 이용한mentioning

confidence: 99%

Researches on Microstrip Reflectarray Antennas

Yoon¹

2015

The Journal of Korean Institute of Electromagnetic Engineering

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“…Arecibo reflector antennas [5] and quasi-optical lens antennas [6] were demonstrated capable of focusing fields as optical lens. In recent years, planar reflectors [7] and planar lens [8] were designed to focus near-fields. Leaky-wave lens is another type of well-studied configuration to achieve near-field focusing [9][10][11].…”

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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“…Radio frequency identification (RFID) is obtaining a growing interest to wirelessly track and identify objects due to its cheapness and reliability [2][3][4]. Now RFID finds many applications in lots of areas like pallet tracking, electronic toll collection, parking lot access, information industry, medical and defense [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Dual-band Dipole Antenna for 2.45 GHz and 5.8 GHz RFID Tag Application

Yu¹,

Ni²,

Xu³

2015

AEM

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In this paper, a dual-band dipole antenna for passive radio frequency identification (RFID) tag application at 2.45 GHz and 5.8 GHz is designed and optimized using HFSS 13. The proposed antenna is composed of a bent microstrip patch and a coupled rectangular microstrip patch. The optimal results of this antenna are obtained by sweeping antenna parameters. Its return losses reach to −18.7732 dB and −18.2514 dB at 2.45 GHz and 5.8 GHz, respectively. The bandwidths (Return loss <=−10 dB) are 2.42~2.50 GHz and 5.77~5.82 GHz. And the relative bandwidths are 3.3% and 0.9%. It shows good impedance, gain, and radiation characteristics for both bands of interest. Besides, the input impedance of the proposed antenna may be tuned flexibly to conjugate-match to that of the IC chip.

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Design of a Near-Field Focused Reflectarray Antenna for 2.4 GHz RFID Reader Applications

Cited by 122 publications

References 17 publications

Researches on Microstrip Reflectarray Antennas

Researches on Microstrip Reflectarray Antennas

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

Dual-band Dipole Antenna for 2.45 GHz and 5.8 GHz RFID Tag Application

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