Bidirectional Radiated Circularly Polarized Annular-Ring Slot Antenna for Portable RFID Reader
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Bidirectional Radiated Circularly Polarized Annular-Ring Slot Antenna for Portable RFID ReaderAbstract
A novel single-layer, microstrip-toslotline transition technique for coupling a circularly polarized annular-ring slot antenna in the UHF band is presented. In the proposed design, circular polarization is generated using a proper asymmetry within the annular-ring slot structure and feeding the annular-ring slot using a slotline feed at 135° from the asymmetry. The direct slotline feed is used which is coupled to a 50-? microstrip line on the opposite side of the substrate. The asymmetry in the proposed design is a meandered-slot section and the proposed CP design is achieved by the two orthogonal linear modes of the annular-ring slot. Simulated and measured results indicate that the proposed structure can achieve good CP radiation performances, and an impedance bandwidth and a 3-dB axial-ratio bandwidth obtained for the design are about 17.6% and 3.72%, respectively.
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