A Near-Field UHF RFID Reader Antenna Without Dead Zones

Guo, Jiayin; Lan, Haokun; Yin, Yingzeng

doi:10.1109/icmmt.2018.8563873

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…The array antenna, however, meets the requirement for the desired application. Figures [25][26][27][28] show the simulated distribution of electric field components (Ex, Ey) at different heights for 1 × 2, 2 × 2, 1 × 4, and 2 × 4 array antennas, respectively. Figures [25][26][27][28] show that the number of antenna units affects the electric field strength; hence, there is a trade-off between the electric field strength (reading height) and the horizontal reading area during design.…”

Section: Arraymentioning

confidence: 99%

“…Figures [25][26][27][28] show the simulated distribution of electric field components (Ex, Ey) at different heights for 1 × 2, 2 × 2, 1 × 4, and 2 × 4 array antennas, respectively. Figures [25][26][27][28] show that the number of antenna units affects the electric field strength; hence, there is a trade-off between the electric field strength (reading height) and the horizontal reading area during design. The distribution of electric field components excited by the array antennas is uniform in the x-and y-directions, and the reading area is controllable.…”

Section: Arraymentioning

confidence: 99%

“…If the distribution of the electric field in a single direction is non-uniform, it will cause missed reading of the tags. The RFID reader antenna can be divided into a circularly polarized antenna [23], a multipolar antenna [24], a traveling-wave antenna [26], a standing-wave antenna [27], etc. The antennas all focus on the horizontal synthetic electric field and achieve the synthetic electric field uniform.…”

Section: The Electric Field Distribution Along X-axis(ex) and Y-axis(ey)mentioning

confidence: 99%

“…Coupled Mode Field Distribution along the X-/Y-axis Tag Test [15] Magnetic coupled Non-uniform Misread [23] Electric coupled Non-uniform Misread [24] Electric coupled Non-uniform Misread [26] Electric coupled Non-uniform Misread [27] Electric coupled Non-uniform Misread Proposed Electric coupled Uniform Accurate read…”

Section: Refmentioning

confidence: 99%

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A Novel Antenna for UHF RFID Near-Field Applications

Yao

et al. 2021

Electronics

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This paper proposed a novel antenna for ultra-high frequency (UHF) radio frequency identification (RFID) near-field applications with uniform distribution of the electric field along the x-axis (Ex), and the y-axis (Ey). The proposed antenna adopted a spiral structure to achieve broadband and multi-polarization. The novel antenna achieved good impedance matching within 860–960 MHz. Using a ground plate, the proposed antenna achieved low far-field gain and a maximum gain of less than −11 dBi. The component of the excited electric field Ex and Ey parallel to the antenna surface was uniformly distributed, and there was no zero point. The proposed antenna achieved a 100% read rate of tags parallel to its surface in the reading area of 150 mm × 150 mm × 220 mm. Simulation results were consistent with the results of real-world measurements, and the proposed antenna was suitable as a reader antenna in near-field applications. The polarization mode of RFID tags is mostly linear polarization, and the placement of tags in practical applications is diversified. Compared with the traditional RFID reader antenna, the proposed antenna achieves uniform electric field distribution parallel to the antenna surface, but the single-direction electric field has zero-reading points, which is easy to cause the misread of tags. The RFID tags can be read more accurately. To verify the scalability of the reading area of the spiral antenna unit, it was used for array design, and simulations were conducted using 1 × 2, 2 × 2,1 × 4, and 2 × 4 arrays. The component distribution of the electric field excited by the four array antennas in the x and y directions was uniform and the reading area was controllable. Therefore, the proposed spiral antenna has the expandability of the reading area and can meet the needs of different application scenarios by changing the number of array units. With the array extension, the matching network also extends, and the impedance characteristics of the array antenna are somewhat different, but they also meet the application requirements.

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Section: Arraymentioning

confidence: 99%

Section: Arraymentioning

confidence: 99%

Section: The Electric Field Distribution Along X-axis(ex) and Y-axis(ey)mentioning

confidence: 99%

Section: Refmentioning

confidence: 99%

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A Novel Antenna for UHF RFID Near-Field Applications

Yao

et al. 2021

Electronics

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“…Research has been performed in designing no surface dead zone antennae. [5] [6] [7] [8] The RFID reader transmits an electromagnetic signal of a full bandwidth less than 1 MHz hopping 75 or more channels 30 seconds by swiftly switching the carrier signals through the available ETSI frequency channels. Another solution is to use a circularly polarized antenna where a spiral beam rotating with time is emitted thus giving advantage for the reader to detect transponders in any orientation.…”

Section: Introductionmentioning

confidence: 99%

A Generalized 90° Out-of-Phase Wilkinson Power Divider for Dual Port UHF CP RFID Antennae with variable Port Distance

Sovis¹,

Jayasooriya²

2020

Preprint

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In this paper a microstrip Wilkinson power divider with a 90° phase delay at one output port is proposed to obtain circular polarization to feed a dual port RFID antenna. The 90° phase delay was obtained by embedding an extra quarter wavelength at one port of the Wilkinson power divider. The feeding circuit is then mounted on the ground plane of the microstrip antenna feeding the radiating patch directly through the ground plane and dielectric layer thus reducing any fringing effect and resulting a mechanically compact unit. The proposed feeding method offers better expectation of antenna performance with minimal attenuation and coupling losses. The design process generalizes geometric pa- rameters of the Wilkinson power divider for variable port distances. The paper considers both UK and US RFID center frequencies, 870 MHz and 915 MHz respectively. Numeri- cally computed values for geometric design parameters for both frequencies are tabled as future design tools for port distances varying from 18 mm up to 34 mm at 870 MHz and 17 mm up to 32 mm at 915 MHz. Simulation results indicate a return loss (S11) of -20 dB and -26 dB at 870 MHz and 915 MHz operational frequencies respectively at 270° angled quarter wavelength.

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Scalable Near-Field Fed Far-Field RAIN RFID Reader Antenna for Retail Checkout Counters

Parthiban

Seet

2020

IEEE J. Radio Freq. Identif.

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A Near-Field UHF RFID Reader Antenna Without Dead Zones

Cited by 4 publications

References 3 publications

A Novel Antenna for UHF RFID Near-Field Applications

A Novel Antenna for UHF RFID Near-Field Applications

<strong>A Generalized 90<sup><em>° </em></sup>Out-of-Phase Wilkinson Power Divider for Dual Port UHF CP RFID Antennae with variable Port Distance</strong>

Scalable Near-Field Fed Far-Field RAIN RFID Reader Antenna for Retail Checkout Counters

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A Near-Field UHF RFID Reader Antenna Without Dead Zones

Cited by 4 publications

References 3 publications

A Novel Antenna for UHF RFID Near-Field Applications

A Novel Antenna for UHF RFID Near-Field Applications

<strong>A Generalized 90<sup><em>&deg; </em></sup>Out-of-Phase Wilkinson Power Divider for Dual Port UHF CP RFID Antennae with variable Port Distance</strong>

Scalable Near-Field Fed Far-Field RAIN RFID Reader Antenna for Retail Checkout Counters

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<strong>A Generalized 90<sup><em>° </em></sup>Out-of-Phase Wilkinson Power Divider for Dual Port UHF CP RFID Antennae with variable Port Distance</strong>