This paper presents the desig polarized (CP) antenna for Radio Freque (RFID) reader using the ring slot microstrip High Frequency (UHF) band. The propose consists of a ring slot microstrip antenna with placed on a FR4 substrate ( r ε = 4.5). The prot fabricated with a total size of 100 × 100 × 1.6 m measured impedance matching band of 830-9 measured rotating linear based circularly p patterns. Keywords-cicularly polarized antenna; a r antenna; UHF RFID reader.I.

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