A NOVEL CIRCULAR POLARIZATION RFID READER ANTENNA WITH A MULTI-BENDING FEEDING STRIP FOR HANDHELD APPLICATIONS

This paper proposes a novel corner-fed Circular Polariza- tion (CP) reader antenna for handheld Ultra-High Frequency (UHF) Radio Frequency Identiflcation (RFID) application. The CP mecha- nism is accomplished by a multi-bending feeding strip located at corner of a high dielectric constant (K = 60) ceramic substrate. By using the high dielectric substrate, the dimension of the proposed antenna can be efiectively reduced to 27 £ 27 £ 4mm 3 , which consists of a top radiat- ing patch, an antenna ground plane, a coupling multi-bending feeding strip, and a SMA connector for RF input. The top radiating patch is printed on the top surface of the ceramic substrate and the antenna ground plane is formed on the opposite side. The central frequency of resonant band can be easily controlled by adjusting the size of the top radiating patch. By optimizing the coupling feeding mechanism, not only impedance matching can be achieved for bandwidth operation in Taiwan's UHF RFID band, but also two orthogonal fleld components

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