A novel miniature monopole tag antenna for passive UHF RFID applications

• Published in: Microwave and optical technology letters Vol. 52; no. 12; pp. 2770 - 2772
• Main Authors: Liu, Hsien-Wen, Ku, Chia-Hao, Yang, Chang-Fa, Wang, Te-Shun
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.12.2010
• Subjects: Antennas; Circuit design; EIRP; Microwaves; Miniature; monopole; Monopoles; quasi-lumped; Radio frequency identification; Reproduction; RFID; tag antenna; UHF
• ISSN: 0895-2477; 1098-2760; 1098-2760
• DOI: 10.1002/mop.25596

A novel miniature monopole tag antenna for passive Ultra‐High Frequency (UHF) radio frequency identification (RFID) operation is presented.The antenna possesses a two‐sided structure that is printed on an FR4 substrate and fed by a 50‐Ω microstrip line. By properly using helical strips and vias, the antenna size can be reduced to a small volume of 10 (L) × 9.5 (W) × 0.8 (H) mm3 to be easily integrated within various portable devices. A miniaturized quasi‐lumped circuit is also designed to attain a good impedance matching between the antenna and the chip. Experimental results demonstrate that the antenna has a suitable operating band about 914–939 MHz and also quite omnidirectional radiation pattern with appreciable gain. Moreover, the proposed compact tag antenna, capable of achieving a maximum readable range of about 5.6 m with an EIRP equal to 4 W, is well suited for RFID applications. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2770–2772, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25596