Magnetic-Field Coupling Characteristics of Ferrite-Coil Antennas for Low-Frequency RFID Applications
Low-frequency technology has been widely used for detecting
objects placed underground. Low-frequency radio-frequency
identification (RFID) systems provide the advantage of better
propagation in lossy materials such as rocks and soil. In this
paper, we assume that buried objects will be tagged with low
frequency RFID passive transponders and that a reader with the
large single-loop antenna will be used to detect the objects. We
propose new orientation-insensitive transponder's antenna.
Simulated and measured results obtained from fabricated
antennas based on the new design show some advantage over the
traditional design. The new antenna offers a more uniform
magnetic field pattern.
Keywords: Low-frequency RFID, double-rod, ferrite core, coils
Download Full-Text
