RFID system exploiting large metal objects as near field UHF RFID antennas

Yang, Shuai; Crisp, Michael; Penty, R.V.; White, I.H.

doi:10.1109/rfid.2017.7945593

Cited by 2 publications

(2 citation statements)

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“…To enhance the cable's RF properties various solutions have been presented. [1][2][3][4][5][6][7][8][9][10] These include, for example, a mathematical approach to help suppressing all ineffective radiation harmonics in an LCX, 1 while in another study, the shapes and sizes of slots in an LCX and their effect on radiating properties were investigated. 2 A maximum read range of 0.6 m using a passive RFID tag with a 6.12 m long LCX with triangular slots on both sides of a meandering slot and with 0.25 W output power was also reported.…”

Section: Introductionmentioning

confidence: 99%

“…8 A solution with a long, thin metal bar acting as a near field antenna for tags placed along the bar was also reported. 9 According to this publication, the proposed system was expected to be functional at over 30 m. In a corridor type space a 5.4 m long LCX in measuring RFID tags was demonstrated. 10 Optimized RF coverage can be achieved by using resonators on the cable, with customizable locations, resulting in tunable radiation intensity along with it.…”

Section: Introductionmentioning

confidence: 99%

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Resonator‐enhanced radiating cable for UHF RFID readers

Putaala

Myllymäki

Kokkonen

et al. 2021

Micro & Optical Tech Letters

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An antenna cable for enhancing and adjusting radio coverage is proposed. The presented solution is applied to the UHF RFID range of 866 MHz. With this leaky-wave antenna cable, radio coverage can be efficient and customizable. A 10 × 100 mm resonator patch is attached on an opening on the cable's outer conductor to improve its radiating properties. The effect of its displacement is studied through simulations and measurements. The alignment affects both resonance frequency and signal strength. One resonator increases the radiated power by 2 dB (37%), multipliable by adding resonators. However, alignment accuracy of millimeters is needed in many cases. The greatest effect in both operating frequency and transmission loss magnitude comes from lifting the resonator from the cable's surface, averagely being 7.6% and 8.6% per mm in measured operating frequency and linear magnitude of S 21 , respectively. Smallest changes are observed when moving the resonator along the cable, being 0.8% and 0.7% per mm, respectively.

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