Compact Circularly Polarized Multiband Antennas for RFID Applications

Abstract EN

This paper presents multiband circularly polarized (CP) antennas forradio frequency identification (RFID).

A coax-fed and a microstrip-line-fed antennas having optimized cross-slots in their patches are firstdesigned for dual-band CP operation.

The microstrip-line-fed design is then modified, by incorporating a U-shaped slot in its partial groundplane, to achieve additional operation band with a CP characteristic.

Simulation and measured results of the presented designs are reported.

The measured results are in accordance with the computed ones.

The compact size and CP property make these designs suitable for RFIDapplications.