Progress In Electromagnetics Research M
ISSN: 1937-8726
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By M. Kanesan, D. V. Thiel, and S. O'Keefe

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Dipole antennas on a substrate without a ground plane are common in wireless sensor networks and RFID applications. This paper reviews a number of theoretical approaches to solving for the effective permittivity when the substrate material is thin. The surface impedance and slab waveguide propagation techniques are compared to a capacitive solution and an insulated wire antenna. The insulated wire method gives most accurate results (< 3.5%) and was verified using numerical modeling and experimental work. Measurements on a planar straight dipole on FR4 (fc = 1.50 GHz) compare favorably with the antenna modelled without the substrate and scaled using the insulated wire technique at (fc = 1.49 GHz). The method can be readily incorporate the effect of an RFID antenna on a thin plastic film placed on a wide variety of lossy and lossless objects.

M. Kanesan, D. V. Thiel, and S. O'Keefe, "A Robust Method of Calculating the Effective Length of a Conductive Strip on an Ungrounded Dielectric Substrate," Progress In Electromagnetics Research M, Vol. 35, 57-66, 2014.

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