Planar Shared Antenna Structure for NFC and UHF-RFID Reader Applications

Wang, Meng-Shuang; Guo, Yong‐Xin; Wu, Wen

doi:10.1109/tap.2017.2742552

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…Figures [13][14][15][16] are the simulated Ez distributions of the three-branch antenna at different heights with different dielectric thicknesses. ey are obtained on the same scale.…”

Section: Parameter Analysismentioning

confidence: 99%

“…In order to read linearly polarized tags arbitrarily placed in the reading area, it is required that the electric field generated by the reader antenna be uniform and controllable in three-dimensional space. e circularly polarized antenna [13,14] can radiate and receive circularly polarized waves. e multipolarized near-field reader antenna [15] can provide a strong and uniform electric field distribution in the area to be read and has a low far-field gain.…”

Section: Introductionmentioning

confidence: 99%

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Novel UHF RFID Near-Field Reader Antenna with Uniform Vertical Electric Field Distribution

Chen

Ren

Zhao

et al. 2020

International Journal of Antennas and Propagation

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This paper presents two novel UHF RFID near-field reader antennas with uniform vertical electric field distribution. The two antennas have the following common characteristics. First, the radiating parts of the two antennas are simulated and fabricated by the microstrip lines and work using the leakage wave principle of microstrip lines. Second, the end of microstrip lines match the load to form a traveling wave mode of operation, so the two antennas have broadband characteristics. Third, both antennas are fed in a coaxial manner at the center of the antenna. The simulation and measurement results can show that the proposed three-branch antenna and four-branch antenna achieve good impedance matching in the range of 883–960 MHz and 870–960 MHz, respectively, and achieve uniform distribution of the vertical electric field component in a certain area. The reading areas of the three-branch antenna and the four-branch antenna are 70 mm × 70 mm × 90 mm and 100 mm × 100 mm × 120 mm (length × width × height), respectively. Due to the introduction of the ground plate, the antenna gain is low, which meets the design requirements of near-field antennas.

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“…Figures [13][14][15][16] are the simulated Ez distributions of the three-branch antenna at different heights with different dielectric thicknesses. ey are obtained on the same scale.…”

Section: Parameter Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel UHF RFID Near-Field Reader Antenna with Uniform Vertical Electric Field Distribution

Chen

Ren

Zhao

et al. 2020

International Journal of Antennas and Propagation

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“…Multi-polarized near-field reader antennas [22][23][24] have a strong and uniform electric field distribution in the reading area and low gain in the far field; however, their reading area is fixed and cannot be expanded. Consequently, a multi-polarized antenna with an expandable reading area was proposed in [25].…”

Section: Introductionmentioning

confidence: 99%

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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“…In [1], the authors proposed a circularly polarized antenna and a two-turn coil for UHF-RFID reader and NFC applications. In [2], the NFC square coil antenna was fabricated on the opposite side of the UHF RFID reader patch antenna for mobile phones.…”

Section: Introductionmentioning

confidence: 99%

“…The antennas are proposed in [1]- [22] for near-and farfield communication applications. However, the antennas in novel RFID system demand the integration of both nearand far-field operations into the same system.…”

Section: Introductionmentioning

confidence: 99%

IoT-Linked Integrated NFC and Dual Band UHF/2.45 GHz RFID Reader Antenna Scheme

Romputtal

Phongcharoenpanich

2019

IEEE Access

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This research proposes a system board of integrated antenna scheme of near-field communication (NFC) and dual band ultra-high frequency (UHF, 920-925 MHz)/2.45 GHz radio frequency identification (RFID) reader antennas for Internet of Things (IoT) applications. The integrated antenna scheme is capable of simultaneous execution of NFC and UHF RFID functions whereby the NFC and UHF RFID modules, which are serially connected to a microcontroller with Wi-Fi module (NodeMCU), read the universal identification (UID) of NFC and UHF RFID tags. The data are then forwarded to a cloud server via Internet of Things (IoT) and are viewable on smartphones using Blynk mobile application via IoT. To realize the optimal antenna design, simulations were carried out using CST Studio Suite. Prototype antennas were subsequently fabricated and integrated into the system board for IoT-linked near-and farfield communication. The simulation and measured results are in good agreement. The NFC reader antenna resonates at 13.56 MHz, and the dual band UHF/2.45 GHz RFID reader antenna achieves the 920-925 MHz and microwave (MW) bands with high isolation. The novelty of the proposed integrated NFC and UHF RFID antenna scheme lies in the use of cloud technology to store real-time and archival data, in place of traditional servers. The integrated antenna scheme could achieve the NFC, UHF, and MW frequency bands, rendering it ideal for IoT applications.INDEX TERMS Near field communication (NFC), radio frequency identification (RFID), NFC antenna, ultra-high frequency (UHF) reader antenna, dual band antenna, Internet of Things (IoT).

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Planar Shared Antenna Structure for NFC and UHF-RFID Reader Applications

Cited by 10 publications

References 21 publications

Novel UHF RFID Near-Field Reader Antenna with Uniform Vertical Electric Field Distribution

Novel UHF RFID Near-Field Reader Antenna with Uniform Vertical Electric Field Distribution

A Novel Antenna for UHF RFID Near-Field Applications

IoT-Linked Integrated NFC and Dual Band UHF/2.45 GHz RFID Reader Antenna Scheme

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