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Compact circularly polarized circular microstrip tag antenna mountable on metallic surface
Author(s) -
Kuo ShangHuang,
Chen HorngDean,
Pan ShanCheng,
Tseng YenMing,
Jheng JingLun
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27480
Subject(s) - microstrip antenna , patch antenna , microstrip , circular polarization , return loss , optics , bandwidth (computing) , axial ratio , microwave , physics , electrical engineering , materials science , antenna (radio) , engineering , telecommunications
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