Preliminary Study of Mutual Coupling Effect on a Passive RFID Antenna Array


The communication quality between an RFID tag and a reader in a RFID network is affected by several factors including the distance between a reader and a tag, orientation of the antennas, and scattering from neighbor tags. Some studies have analyzed those factors and their impact on a read-rate of RFID systems. However, they neglected the effect of a mutual coupling among neighbor tags. In this paper, we formulate the driving currents of a RFID antenna array considering the mutual impedance among tags. Afterwards, we both measure and simulate the mutual impedance for the used RFID tag that is Alien 9640 Squiggle Inlay and we compare the result with half wave dipoles which we construct. Simulation results show that current distribution on tags increases when compared with the case that mutual coupling is not considered among tags.

Meeting Name

IEEE International Instrumentation and Measurement Technology Conference: Instrumentation and Measurement for Life (2013: May 6-9, Minneapolis, MN)


Electrical and Computer Engineering

Keywords and Phrases

Antenna Array; Mutual Coupling; RFID Systems; Communication Quality; Current Distribution; Driving Current; Half-Wave Dipole; Mutual Impedance; Electric Impedance; Instruments; Radio Frequency Identification (RFID); Measurements

International Standard Book Number (ISBN)


International Standard Serial Number (ISSN)


Document Type

Article - Conference proceedings

Document Version


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© 2013 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 May 2013