University of Oulu

M. Kokkonen, S. Myllymäki, J. Putaala and H. Jantunen, "A Resonator Enhanced UHF RFID Antenna Cable for Inventory and Warehouse Applications," in IEEE Journal of Radio Frequency Identification, vol. 6, pp. 128-133, 2022, doi: 10.1109/JRFID.2021.3135047.

A resonator enhanced UHF RFID antenna cable for inventory and warehouse applications

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Author: Kokkonen, Mikko1; Myllymäki, Sami1; Putaala, Jussi1;
Organizations: 1Microelectronics Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2022-06-21


Structures to improve the RF properties of leaky coaxial cables (LCX) are proposed. These resonator structures are optimized for UHF RFID frequency of 866 MHz; however, they are applicable also to other frequencies of interest by redimensioning with corresponding data. Simulations of leaky coaxial cables with resonators (denoted “RCX”) show to improve the antenna gain, which is verified also by measurements. Compared to traditional LCX, RCX have increased radiating power capability while the shape of the propagated wave is also controlled. Cables are simulated with lengths 2.1 m and 6.4 m where the number of radiating slots and resonators is varied. RCXs exhibit a much higher radiation capability than LCXs. The radiation efficiency for RCXs is between 40% ⋯60 % whereas an LCX has only 0.2% efficiency. Simulations are complemented with measurements of the 2.1 m cables. A 30x improvement of the read range of passive RFID tags are reported in tests, from 0.05 m to 1.5 m along the resonator cable. The cable length can be extended so that the signal is carried to the radiating point of the cable using conventional, i.e., non-radiating coaxial cable.

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Series: IEEE journal of radio frequency identification
ISSN: 2469-7281
ISSN-E: 2469-7281
ISSN-L: 2469-7281
Volume: 6
Pages: 128 - 133
DOI: 10.1109/JRFID.2021.3135047
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research was done in DINO and LAPA projects which were funded by Business Finland.
Copyright information: © 2022 The Authors. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see