U-Shaped Inductively Coupled Feed UHF RFID Tag Antenna With DMS for Metal Objects

Erman, Fuad; Hanafi, Effariza; Lim, Eng-Hock; Mahyiddin, Wan Amirul Wan Mohd; Harun, Sulaiman Wadi; Umair, Hassan; Soboh, Rawan S.M.

doi:10.1109/lawp.2020.2981960

Cited by 11 publications

(10 citation statements)

References 20 publications

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“…The reading distance dropped to 4.56 𝑚 when 𝑊 𝑥 changed from 20 to 10 cm due to the effect on the electrical flux strength at 𝜃 = 0 °, which is only affected while varying Wx as shown in Fig. 9(b) [38]. These results indicate that the resonant frequency is still stable when the dimensions of metallic surface are changed, in other words, the RFID tag response to reader still appears over same frequency range while either 𝐿 𝑦 or 𝑊 𝑥 of metallic surface are varied.…”

Section: Resultsmentioning

confidence: 98%

Low-Profile Interdigitated UHF RFID Tag Antenna for Metallic Objects

et al. 2022

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This article presents a novel miniature interdigitated ultra-high frequency (UHF) radio frequency identification (RFID) tag antenna that can be placed on metallic objects. The tag structure comprises two horizontal strip lines, each loaded with seven identical open stubs, and an integrated circuit (IC) chip connected directly to the feed lines in the middle of the structure. The perfect match to the IC chip's impedance is realized by adjusting the length of the loaded open stubs and the spaces between the stubs. Molding the antenna's geometry can be applied to realize conjugated impedance with any sort of IC chip due to the flexibility of the tag structure. It is fabricated on a Polytetrafluoroethylene (PTFE) slab. Moreover, its structure does not involve any metallic vias or shorting walls, which makes its construction simple and suitable for mass production. The tag of the size of 55.2 𝑚𝑚 × 44.2 𝑚𝑚 × 1.5 𝑚𝑚 yields a total realized gain of −4.11 dB at the operating frequency while being placed on a 20 𝑐𝑚 × 20 𝑐𝑚 metallic plate. The measured detection distance is 8.14 m on metallic objects. A good match between the measured and simulated results is observed.INDEX TERMS Impedance matching, interdigitated structure, metal mountable tag antenna, miniature UHF tag antenna.

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Section: Resultsmentioning

confidence: 98%

Low-Profile Interdigitated UHF RFID Tag Antenna for Metallic Objects

et al. 2022

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“…The equivalent circuit tag antenna with T-match feed line is depicted in Figure 2 [17]. The input impedance of the proposed antenna in Figure 1, is given as [18] 𝑍 𝑎 = 𝑅 𝑎 + 𝑗𝑋 𝑎 = 𝑍 𝑡 + 𝑍 𝑐𝑡𝑝 + (2𝜋𝑓𝑀) 2 𝑍 𝑚 (1) where Zt is the T-match feeder impedance, Zctp is the impedance of the capacitive tip loading, Zm is the meandered line impedance and M is the inductive mutual coupling between the T-match feeder and radiating body including meandered line and capacitive tip loading. The transfer power coefficient,  is given by [19] :…”

Section: Figure 1 Proposed Rfid Tag Antenna Configurationmentioning

confidence: 99%

Design of a Flexible T-Matched Feed UHF RFID Tag Antenna

Miswadi

Rahman

Subahir

et al. 2022

J. Phys.: Conf. Ser.

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A flexible radio frequency identification (RFID) tag antenna with a T-match feeder is proposed in this paper. The T-match feed acts as the conjugate network matching of the tag antenna and 0.99 of power transfer coefficient was achieved. By incorporating a meander line and capacitive tip loading technique, the compact size is realized with a wide bandwidth of 44MHz that can cover the RFID spectrum allocated for the Malaysia region, from 919 to 923 MHz. The proposed antenna is printed on the flexible polyethene terephthalate (PET) substrate with a dimension of 90mm × 24mm × 0.143mm. By employing 4W EIRP power, the detection distance of 29.15m in free space. The proposed meandered line and capacitive tip loading tag antenna with T-match feed line is beneficial to be part of the RFID systems because of their compactness, wide bandwidth and high-power transfer coefficient.

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“…To solve the problem introduced by the metallic surface, various antenna structures with antimetal effects have been proposed. There are many solutions to the inability of the tag antenna on the metallic surface, such as the electromagnetic bandgap (EBG), 1 the artificial magnetic conductor (AMC), 2 increasing the thickness of the label, 3,4 and the microstrip antenna structures 5–12 . EBG, for example in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…There are many solutions to the inability of the tag antenna on the metallic surface, such as the electromagnetic bandgap (EBG), 1 the artificial magnetic conductor (AMC), 2 increasing the thickness of the label, 3,4 and the microstrip antenna structures. [5][6][7][8][9][10][11][12] EBG, for example in Ref. [1], is a periodic structure that can enhance the radiation capability of the antenna by controlling the propagation of electromagnetic waves.…”

Section: Introductionmentioning

confidence: 99%

“…3 However, these approaches often lead to a large thickness of labels. 4 Last, the authors 5 propose a structure based on the defect microstrip surface technique, which can excite the microstrip patch effectively by using a time-varying electric field. There are a few other methods using microstrip structure that might give us some inspiration, such as loading with a nonresonating ring underneath, 6 using folded patch, [7][8][9][10] placing four identical planar inverted-L antennas (PILAs) in rotational symmetry constellation, 11 and using high permittivity substrates.…”

Section: Introductionmentioning

confidence: 99%

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A broadband antimetal UHF tag antenna based on symmetric resonator structures

Chen

Wang

Jiang

et al. 2022

Micro & Optical Tech Letters

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A novel broadband ultra-high frequency radio frequency identification (RFID) tag antenna attached to the metallic surface is proposed in this paper.A rectangular wide slot combined with a U-shaped thin slot outside is adopted in the proposed antenna, and the size of the patch can be reduced by adjusting the length of the U-shaped slot. Furthermore, a pair of symmetric resonator structures inside the rectangular slot are connected to both ends of the chip, which can excite a new resonant mode to broaden the frequency band. All the structures above are realized by etching rectangular slits on the same surface. The antenna has the advantages of wideband, simple processing, and good reading distance, and the 10 dB bandwidth of the antenna is 30 MHz (from 895 to 925 MHz), with a maximum directional gain of −3.5 dB. The reading distance can reach more than 5.4 m on a metallic surface.

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U-Shaped Inductively Coupled Feed UHF RFID Tag Antenna With DMS for Metal Objects

Cited by 11 publications

References 20 publications

Low-Profile Interdigitated UHF RFID Tag Antenna for Metallic Objects

Low-Profile Interdigitated UHF RFID Tag Antenna for Metallic Objects

Design of a Flexible T-Matched Feed UHF RFID Tag Antenna

A broadband antimetal UHF tag antenna based on symmetric resonator structures

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