Compact Circularly Polarized Meandered-Loop Antenna for UHF-Band RFID Tag

Chen, Horng‐Dean; Sim, Chow‐Yen‐Desmond; Tsai, Ching-Han; Kuo, Colin

doi:10.1109/lawp.2016.2518215

Cited by 31 publications

(25 citation statements)

References 6 publications

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“…To realize CP radiation, most tag antennas [8][9][10][11][12][13][14][15][16][17][18][19][20] have been designed only for far-field radiation in UHF band. e CP tag antennas for UHF-RFID band with modified slit [8][9][10] and slot [11,12] are proposed.…”

Section: Introductionmentioning

confidence: 99%

Near-Field HF-RFID and CMA-Based Circularly Polarized Far-Field UHF-RFID Integrated Tag Antenna

Sakonkanapong

Phongcharoenpanich

2020

International Journal of Antennas and Propagation

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This research proposes an integrated high-frequency (HF) and ultrahigh-frequency (UHF) passive radio frequency identification (RFID) tag antenna for near-field (13.56 MHz) and far-field (920–925 MHz) communication. This tag antenna is advantageous for the applications with lossy material in the near-field communication and mitigates polarization loss in the far-field communications. The HF-RFID tag antenna is of square spiral structure, and the circularly polarized UHF-RFID structure consists of a square loop radiator with cascading loop feeding and shorted stub. The structure of HF-RFID tag antenna situated inside the circularly polarized UHF-RFID tag can avoid the significant effect of the near-field magnetic coupling from the square loop. The UHF-RFID tag antenna is realized by using characteristic mode analysis for wideband circular polarization. The HF-RFID structure is conjugate-matched with NXP NT3H2111 chip, and the UHF-RFID structure is conjugate-matched with NXP G2X chip. Simulations were carried out, and an antenna prototype was fabricated. The experimental results reveal that the radiation pattern of UHF-RFID tag antenna is bidirectional with a gain of 0.31 dBic. The impedance bandwidth covers the frequency range of 903–944 MHz, and the axial ratio in boresight direction at 922.5 MHz is 1.67 dB, with the axial ratio bandwidth over 863–938 MHz. The maximum near-field and far-field reading ranges are 4.9 cm and 8.7 m. The proposed integrated dual-band passive tag antenna is operationally ideal for HF-RFID and UHF-RFID applications.

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Section: Introductionmentioning

confidence: 99%

Near-Field HF-RFID and CMA-Based Circularly Polarized Far-Field UHF-RFID Integrated Tag Antenna

Sakonkanapong

Phongcharoenpanich

2020

International Journal of Antennas and Propagation

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“…In literature, there are many solutions available to solve this problem of platform tolerant UHF RFID tag especially for counter metallic surface effects [12,13]. In [14], a dual layer PIFA antenna was introduced for platform tolerant applications.…”

Section: Introductionmentioning

confidence: 99%

Tunable Platform Tolerant Antenna Design for RFID and IoT Applications Using Characteristic Mode Analysis

Sharif

Ouyang

Yang

et al. 2018

Wireless Communications and Mobile Computing

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Radio frequency identification (RFID) is a key technology to realize IoT (Internet of Things) dreams. RFID technology has been emerging in sensing, identification, tracking, and localization of goods. In order to tag a huge number of things, it is cost-effective to use one RFID antenna for tagging different things. Therefore, in this paper a platform tolerant RFID tag antenna with tunable capability is proposed. The proposed tag antenna is designed and optimized using characteristic mode analysis (CMA). Moreover, this tag antenna consists of a folded patch wrapped around FR 4 substrate and a feeding loop element printed on a paper substrate. The inductive feeding loop is stacked over folded patch and it provides impedance match with RFID chip. Because of separate radiating and feeding element, this tag antenna has a versatility of impedance matching with any RFID chip. Furthermore, this tag is able to cover American RFID band (902–928 MHz) and can be tuned to European RFID band (865–868 MHz) by adding tunable strips. In order to demonstrate platform tolerant operation, the read range of RFID tag is measured by mounting it on different materials. The maximum read range of RFID tag is 4.5 m in free space or on dielectrics and 6.5 m above 200 × 200 mm2 metal plate, respectively.

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“…Furthermore, a compact circularly polarized structure of UHF RFID tag antenna has been presented by Lu and Chang in Reference by introducing a Y‐shaped slit and two orthogonal N‐shaped slits to provide wider half power operating bandwidth (135 MHz); but the obtained 3‐dB AR bandwidth is less than 10 MHz. Square‐loop and meandered‐loop CP antennas have also been studied for long read range UHF RFID systems. The meandered‐loop antenna exhibits antenna size miniaturization in comparison to square‐loop antenna.…”

Section: Introductionmentioning

confidence: 99%

“…Square‐loop and meandered‐loop CP antennas have also been studied for long read range UHF RFID systems. The meandered‐loop antenna exhibits antenna size miniaturization in comparison to square‐loop antenna. A CP square ring tag with meander strip is proposed for the automatic toll collection system which reported 64% smaller size than the antennas attached to safety glass but it has only 8.3 m read range.…”

Section: Introductionmentioning

confidence: 99%

Linearly tapered meander line cross dipole circularly polarized antenna for UHF RFID tag applications

Bhaskar

Singh

2018

Int J RF Microw Comput Aided Eng

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In this article, a circularly polarized antenna for ultra‐high frequency radio frequency identification (RFID) tag is presented. The circular polarization is realized by two orthogonal, unequal length linearly tapered meander line cross dipoles. The meander structure with capacitive tip loading is used for size miniaturization of the antenna. A modified T‐match network is employed to feed the cross dipole structure. The measured 10‐dB return loss bandwidth of the cross dipole antenna is 17 MHz (908‐923 MHz) and the corresponding 3‐dB axial ratio bandwidth is 6 MHz (912‐918 MHz). The overall size of the proposed antenna is 0.17λ0 × 0.17λ0 at 915 MHz. The maximum read range between the reader and the tag with the proposed antenna is 4.7 m larger than the analogous linearly polarized tag antenna due to the reduction in polarization loss between the tag and reader antennas. Thus, a maximum read range of 15.66 m with the gain of 1.28 dBic is achieved at 915 MHz.

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Compact Circularly Polarized Meandered-Loop Antenna for UHF-Band RFID Tag

Cited by 31 publications

References 6 publications

Near-Field HF-RFID and CMA-Based Circularly Polarized Far-Field UHF-RFID Integrated Tag Antenna

Near-Field HF-RFID and CMA-Based Circularly Polarized Far-Field UHF-RFID Integrated Tag Antenna

Tunable Platform Tolerant Antenna Design for RFID and IoT Applications Using Characteristic Mode Analysis

Linearly tapered meander line cross dipole circularly polarized antenna for UHF RFID tag applications

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