A Fractal-Based Circularly Polarized UHF RFID Reader Antenna

Raviteja, Chinnambeti; Varadhan, Chitra; Kanagasabai, Malathi; Sarma, Aswathy K.; Velan, Sangeetha

doi:10.1109/lawp.2014.2308953

Cited by 41 publications

(18 citation statements)

References 10 publications

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“…3(b), the vertical stub acts as an important component for antenna performance. In fact, a ground plane stub of length l s is added to improve the AR of the given structure along with proper impedance matching [15]. So the vertical stub can be used to couple with the open-loop and the C-shaped monopole.…”

Section: Antenna Designmentioning

confidence: 99%

Broadband C-Shaped Circularly Polarized Monopole Antenna

Ding

Gao

Tang

et al. 2015

IEEE Trans. Antennas Propagat.

117

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A novel broadband monopole antenna with circular polarization (CP) is designed and fabricated. It consists of a C-shaped monopole, an open-loop on the backside of the monopole and a modified ground plane. By placing a rectangular open-loop coplanar with the ground plane and connecting a rectangular vertical stub to the ground plane, wide impedance bandwidth is achieved, and axial-ratio (AR) bandwidth of the antenna could be improved simultaneously. The measured results exhibit a 65.2% (4.14 GHz, 4.28-8.42 GHz) CP bandwidth, and the 10-dB impedance bandwidth is 87.7% (6.66 GHz, 4.26-10.92 GHz). Finally, by placing a reflector underneath the antenna with its structural dimensions unchanged, one can obtain unidirectional radiation patterns with greatly improved gains. The advantages of the proposed antenna are the simple structure, a compact size, and a broad 3-dB AR bandwidth. Index Terms-Circularly polarized (CP), axial-ratio (AR), broadband, monopole antenna.

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Section: Antenna Designmentioning

confidence: 99%

Broadband C-Shaped Circularly Polarized Monopole Antenna

Ding

Gao

Tang

et al. 2015

IEEE Trans. Antennas Propagat.

117

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show abstract

“…[1,2]. RFID is a non-contact auto-identification technology used to identify either static or mobile objects by electromagnetic coupling in the space [3].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the highperformance RFID reader antennas with the characteristics of compactness, low profile and especially circularly polarized feature are ever increasingly demanded in the practical RFID applications [3]. The general frequency band of UHF RFID system for global applications is 840-960 MHz, while different countries have different frequency divisions in the UHF band, such as 840.5-844.5 MHz and 920.5-924.5 MHz bands in China, 866-869 MHz and 920-925 MHz in Singapore, and 902-928 MHz in America [2].…”

Section: Introductionmentioning

confidence: 99%

First-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna With Simple Feeding Network for Uhf Rfid Reader

Yang¹,

Feng²,

Zheng³

2018

PIER Letters

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Abstract-A circularly polarized (CP) antenna with simple feeding network for ultra-high-frequency (UHF) radio-frequency identification (RFID) reader application is presented in this letter. The proposed antenna consists of a slot loop etched on the ground and a simple feeding network using bended microstrip lines. And the two parts of the antenna are printed on either sides of a thin substrate, thus a low-profile antenna is obtained. The slot loop is meandered based on the first-order Minkowski fractal technique for antenna size reduction. To generate circularly polarized radiation, two branches of the feeding network are designed to be orthorhombic with 90 • phase difference. The antenna is simulated and practically fabricated with a compact size of 80 × 80 × 1.6 mm 3 . The 10-dB impedance bandwidth and 3-dB axial-ratio (AR) bandwidth are measured to be 50 MHz (0.896-0.946 GHz) and 12 MHz (0.916-0.928 GHz), respectively. The measured peak gain exhibits stable value of 3 dBi over the impedance bandwidth. Furthermore, a wide 3-dB beamwidth of 120 • is achieved for the proposed antenna. Based on the above, this antenna is well suited for applications in UHF RFID handheld readers.

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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]. Generally speaking, in RFID system different frequency spectrums are allocated to different countries or regions.…”

Section: Introductionmentioning

confidence: 99%

“…Generally speaking, in RFID system different frequency spectrums are allocated to different countries or regions. For instance, 840.5~844.5 MHz and 920.5~924.5 MHz in China, 865~867 MHz in India, 902~928 MHz in Argentina and America, 866~869 MHz and 920~925 MHz in Singapore, and 952~955 MHz in Japan, and so on [6,7]. With the fast development of global economy, the exchanges of products made from different countries have become more and more frequent.…”

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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A Fractal-Based Circularly Polarized UHF RFID Reader Antenna

Cited by 41 publications

References 10 publications

Broadband C-Shaped Circularly Polarized Monopole Antenna

Broadband C-Shaped Circularly Polarized Monopole Antenna

First-Order Minkowski Fractal Circularly Polarized Slot Loop Antenna With Simple Feeding Network for Uhf Rfid Reader

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

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