University of Oulu

Putaala, J., Myllymäki, S., Kokkonen, M., & Jantunen, H. (2021). Resonator‐enhanced radiating cable for UHF RFID readers. Microwave and Optical Technology Letters, 63(7), 1842–1847.

Resonator‐enhanced radiating cable for UHF RFID readers

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Author: Putaala, Jussi1; Myllymäki, Sami1; Kokkonen, Mikko1;
Organizations: 1Microelectronics Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
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Language: English
Published: John Wiley & Sons, 2021
Publish Date: 2021-03-24


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 S21, 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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Series: Microwave and optical technology letters
ISSN: 0895-2477
ISSN-E: 1098-2760
ISSN-L: 0895-2477
Volume: 63
Issue: 7
Pages: 1842 - 1847
DOI: 10.1002/mop.32844
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been supported by Business Finland and companies participating in the Distributed RFID Network (DINO) project.
Copyright information: © 2021 The Authors. Microwave and Optical Technology Letters published by Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.