Minimum Activation Power of a Passive UHF RFID Tags: a Low Cost Method

Silva, Samuel Bloch da; Correia, Anderson Ribeiro

doi:10.5028/jatm.v10.854

Cited by 2 publications

(3 citation statements)

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“…During the actual measurement process, the RFID reader transmits and changes its power gradually until a backscattered power is received from the tag. The threshold power P tx is the minimum required reader's transmitted power to activate the tag, and with reference to P tx , the tag turn-on power, usually called tag activation power or tag sensitivity P tag [12,13] can then be calculated as…”

Section: Resultsmentioning

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

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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.

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Section: Resultsmentioning

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

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show abstract

“…15 shows the simulated and measured axial ratio values for both antennas. The general purpose MSA and the MSA with NIM planar lens were submitted to the read range tests adapted from [2,13,35]. Separately, each antenna prototype is connected to the IF2 RFID Reader using a 4 m LMR-195 and fixed 1 m above the ground with their broadside aligned to an AD-237 tag.…”

Section: Resultsmentioning

confidence: 99%

“…In Fig. 16, an illustration of the read range test scenario can be seen adapted from [35]. The maximum read range d were first obtained with an AD-237 tag placed horizontally and then, vertically.…”

Section: Resultsmentioning

confidence: 99%

A Novel Gain-Enhanced Antenna With Metamaterial Planar Lens for Long-Range Uhf Rfid Applications

Moreira¹,

Martins²,

Ribeiro³

et al. 2019

PIER B

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A novel gain-enhanced microstrip antenna (MSA) with metamaterial planar lens for longrange radio frequency identification (RFID) applications for the 902-928 MHz UHF frequency band is proposed in this paper. The antenna is a combination of a new general-purpose circularly polarized MSA and a novel effective negative refractive index metamaterial (NIM) slab of 25 unit cells, arranged in a 5 × 5 layout, working as a planar lens for gain enhancement. The general-purpose MSA has an impedance frequency band of 828-1015 MHz, a maximum gain of 8.43 dBi at 915 MHz, an axial ratio frequency band of 896-931 MHz, and excellent performance for short and medium range RFID applications. The new infinite periodicity NIM slab has a negative refractive band of 886-1326 MHz, a negative electric permittivity band of 888-3406 MHz, and a negative magnetic permeability of band 885-1065 MHz. Together, the general-purpose MSA and the NIM planar lens results in the low-cost gain-enhanced antenna for long-range RFID applications, with an 843-993 MHz impedance frequency band and a maximum broadside gain enhancement of 48.27%, resulting in a 12.5 dBi gain at 902 MHz. Finally, the parametric studies conducted during the design process of the gain-enhanced antenna with metamaterial planar lens are presented.

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Minimum Activation Power of a Passive UHF RFID Tags: a Low Cost Method

Cited by 2 publications

References 0 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

A Novel Gain-Enhanced Antenna With Metamaterial Planar Lens for Long-Range Uhf Rfid Applications

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