This paper presents the design and prototyping of a low profile circularly polarized antenna for UHF RFID readers. This antenna has a very low profile, a low cost structure and is composed of two dipoles with 90° phase shift. In addition, to reduce the back beam radiation an artificial magnetic conductor surface (AMC) witch introduce a 0° of phase refection is used. The maximum gain is 1 dBi and the axial ratio around 3 dB in the UHF ETSI band. The overall size of the antenna is 157 mm × 157 mm × 3.2 mm.
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