Design of wideband RFID tag antenna for metallic surfaces

RFID Antennas – Possibilities and Limitations

“…Fabricating efficient MSAs from low-loss microwave substrates is therefore not possible for general RFID applications. Some low cost materials, such as foam, have been used as MSA substrate for RFID [15] but no cheaper alternative solution has been proposed for the conducting parts. Unlike a conventional dipole-type antenna, the MSA is a structure with two conducting layers acting as a resonance cavity and which is thus much more sensitive to ohmic losses in the substrate and conductors than for the simple one-layer antennas investigated previously.…”

Design of Antennas for RFID Application

“…Other types of tag antenna mounted on the metallic objects, such as the inverted-F antenna and its modifications are also popular. For the details about these antennas, refer to Kim et al, 2005;Son et al, 2006;Ukkonen, Sydänheimo et al, 2004;Hirvonen et al, 2004;and Ukkonen, Engels et al, 2004. …”

Design of a Wideband Inductively Coupled Loop Feed Patch Antenna for UHF RFID Tag

“…When mounted on metal objects, the metal plane will act as an extension of its ground plane hence giving little effect to the antenna performance. Several microstrip an-tennas for UHF RFID tag have been proposed by [9][10][11][12][13]. However, they exhibit narrow bandwidth.…”