Folded Patch Antenna With Tunable Inductive Slots and Stubs for UHF Tag Design

Ng, Wai-Hau; Lim, Eng-Hock; Bong, Fwee-Leong; Chung, Boon-Kuan

doi:10.1109/tap.2018.2821702

Cited by 43 publications

(24 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…No signal is detected in the reverse side due to the existence of the backing copper plate. Detailed description on the measurement processes can also be found in [6].…”

Section: Resultsmentioning

confidence: 99%

“…These antennas are thin, simple to design, and low costs as they do not require extra shorting vias or walls which are usually fabricated by using the PCB processes. Usually, a tag antenna is required to have multiple tuning mechanisms for bringing down its resonance to the regulated UHF band [6]. Most of the tag antennas, however, are not able to provide impromptu tuning capabilities, as it is very difficult to change some of the small physical structures as soon as an antenna is made.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Compact Metal-Mountable Uhf Rfid Tag Antenna With Two Large C-Shaped Slots for on-the-Fly Tuning

Bong¹,

Thirappa²,

Lim³

et al. 2021

PIER M

Self Cite

View full text Add to dashboard Cite

A compact folded-patch UHF RFID tag antenna (30 mm × 30 mm × 3 mm or 0.0912λ × 0.0912λ × 0.009λ) is proposed for metallic surface applications. Two large C-shaped slots, which can be easily tuned by adjusting their lengths, are incorporated into the folded-patch for providing tuning mechanisms that can be employed in the production line for tuning the tag resonant frequency on the fly. The slots are tactfully embedded into the patch structure so that they occupy no footprint. The slots are large enough so that their lengths can be easily adjusted by employing a penknife and some copper tapes. This provides an impromptu tuning mechanism so that the tag resonant frequency can be easily corrected in the production line. With reference to the effective isotropic radiated power of 4 W, the proposed tag antenna can be read from 10 m on metal. The read range is found to be able to go beyond 5.5 m when the tag is placed on a dielectric with permittivity ranging from 1 to 12.

show abstract

“…No signal is detected in the reverse side due to the existence of the backing copper plate. Detailed description on the measurement processes can also be found in [6].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact Metal-Mountable Uhf Rfid Tag Antenna With Two Large C-Shaped Slots for on-the-Fly Tuning

Bong¹,

Thirappa²,

Lim³

et al. 2021

PIER M

Self Cite

View full text Add to dashboard Cite

show abstract

“…Meanwhile, the works presented in refs. [24][25][26]28,32,37] have used folding polyethylene terephthalate (PET) around the foam without requiring any metallic vias or shorting pins. However, the best achieved realized gain is 1 dB for the designed work in ref.…”

Section: Simulated and Measured Resultsmentioning

confidence: 99%

“…The resonance frequency of an electrically small tag antenna is known to be commonly high, thus making it crucial for the operating frequency to be shifted down for utilization over UHF band frequencies. The designed procedure requires the current path to be increased by adding the additional arms and outer strip lines, whereby inductance of the tag antenna is increased by raising the surface current density [32], as illustrated in Figure 2. The first stage is initialized by simulating the folded dipole having two symmetric C-shaped resonators only, in which the IC chip is attached in the gap (G = 0.5 mm) between the resonators.…”

Section: Design Stagesmentioning

confidence: 99%

Miniature Compact Folded Dipole for Metal Mountable UHF RFID Tag Antenna

et al. 2019

Self Cite

View full text Add to dashboard Cite

This article describes the design of an Ultra-High Frequency (UHF) miniature folded dipole Radio Frequency Identification (RFID) tag antenna that can be mountable on metallic objects. The compact tag antenna is formed from symmetric C-shaped resonators connected with additional arms embedded into the outer strip lines for miniaturization purposes. It is loaded with outer strip lines, resulting in a flexible tuning method that is capable of matching the integrated circuit (IC) chip’s impedance. The proposed tag is fabricated on a single layer of Polytetrafluoroethylene (PTFE) substrate. It has simple structure and does not require any metallic vias or shorting plate. The miniature tag antenna with a size of 82.75 × 19.5 × 1.5 mm 3 yields a total realized gain of − 0.53 dB at the resonance frequency when attached to a 40 × 40 cm 2 metal plate. The presented design utilizes a European RFID band, and the simulated results of realized gain, read range, and input impedance are verified with measurement results.

show abstract

“…The input impedance of the outer strip line can be calculated from equation 5in Lee et al [32]. In other words, the presence of the outer strip lines intensifies the surface current in the folded dipole arms, thereby enhancing the antenna's inductance [33]. Further increasing the current paths would require adding strip lines on the outer sides.…”

Section: Parametric Studymentioning

confidence: 99%

Low-profile folded dipole UHF RFID tag antenna with outer strip lines for metal mounting application

Erman¹,

Hanafi²,

Lim³

et al. 2020

Turk J Elec Eng & Comp Sci

Self Cite

View full text Add to dashboard Cite

A metal mountable UHF RFID tag antenna with a low-profile folded dipole structure is proposed. It is fabricated on a single layer of polytetrafluoroethylene (PTFE) dielectric laminate. It is composed of two symmetrical C-shape resonators integrated with the outer strip lines. The IC chip's terminals are connected directly to the center of the C-shaped resonators. The outer strip lines are integrated with the C-shaped resonators, which function to lower the reflection coefficient so as to match the IC chip impedance. In particular, the outer strip lines increase the inductive reactance of the antenna impedance in order to realize IC chip impedance. The design has a simple structure, due to the fact that it lacks any metallic vias. Moreover, the gain of the tag antenna can be enhanced when positioned on a large metallic sheet. Installed on a 40 × 40 cm 2 metallic plate, the total gain of the proposed tag antenna is 3 dB, with a maximum reading range of 5.77 m, while it is 3.92 m in free space. The simulation results were in excellent agreement with the fabricated design results.

show abstract

Folded Patch Antenna With Tunable Inductive Slots and Stubs for UHF Tag Design

Cited by 43 publications

References 30 publications

Compact Metal-Mountable Uhf Rfid Tag Antenna With Two Large C-Shaped Slots for on-the-Fly Tuning

Compact Metal-Mountable Uhf Rfid Tag Antenna With Two Large C-Shaped Slots for on-the-Fly Tuning

Miniature Compact Folded Dipole for Metal Mountable UHF RFID Tag Antenna

Low-profile folded dipole UHF RFID tag antenna with outer strip lines for metal mounting application

Contact Info

Product

Resources

About