Coupling-Feed Circularly Polarized RFID Tag Antenna Mountable on Metallic Surface
Operability of Folded Microstrip Patch-Type Tag Antenna in the UHF RFID Bands Within 865-928 MHz
A circularly polarized planar antenna modified for passive UHF RFID
Novel Compact Circularly Polarized Square Microstrip Antenna
The art of UHF RFID antenna design: impedance-matching and size-reduction techniques
The history of RFID