Abstract
A compact circularly polarized circular microstrip tag antenna designed for RFID UHF band is presented.The proposed tag antenna is excited by using microstrip-line coupling-feed method. By choosing the proper lengths of two short-circuited arc microstrip lines and its coupling distance, good complex impedance matching can be obtained. Moreover, a cross slot of unequal arm lengths embedded in a circular patch is used to achieve compact circularly polarized operation. The measured 10-dB return-loss bandwidth of the tag antenna is 40 MHz (901–941 MHz), while the 3-dB axial-ratio bandwidth is 6 MHz (912–918 MHz). Further experiment shows that the tag antenna can provide a significantly increased reading range when mounted on a metallic surface. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1107–1112, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27480
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