Antenna Modeling for Inductive RFID Applications Using the Partial Element Equivalent Circuit Method

• Published in: IEEE transactions on magnetics Vol. 46; no. 8; pp. 2967 - 2970
• Main Authors: Scholz, Peter, Ackermann, Wolfgang, Weiland, Thomas, Reinhold, Christian
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.08.2010; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas; Coils; Computation; Coupling circuits; Cross-disciplinary physics: materials science; rheology; Equivalent circuits; Exact sciences and technology; Frequency dependence; Impedance; Inductance; Inductive coupling; Magnetism; Materials science; Mathematical models; Mutual coupling; Other topics in materials science; Parasitic capacitance; PEEC method; Physics; Proximity effect; Radio frequency identification; Radiofrequency identification; reduced order systems; RFID; spiral antennas; Three dimensional; spiral antennas; RFID; reduced order systems; Modelling; Application; Magnetic properties; Equivalent circuits; PEEC method
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2010.2043824

In this paper equivalent circuit models of inductive coupled radio frequency identification (RFID) antenna systems are extracted by means of the partial element equivalent circuit (PEEC) method. Each antenna impedance is analyzed separately regarding frequency dependent behavior including skin- and proximity effects as well as parasitic capacitances. On the contrary, the inductive coupling between any two coils is computed for an arbitrary 3D spatial arrangement by a filamentary mutual inductance computation technique, allowing for fast spatial sweeps. Both models are combined to a reduced equivalent circuit that maintains the topology of mutually coupled inductances. The described approach is tested with a conventional reader transponder arrangement and compared with the full PEEC models.