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Bandwidth enhancement in compact dual open‐loop antenna for UHF near‐field RFID reader
Author(s) -
Chen HuaMing,
Lin YiFang,
Chen ChienHung,
Hsu JuiChan
Publication year - 2015
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.29254
Subject(s) - loop antenna , antenna tuner , ultra high frequency , electrical engineering , antenna measurement , bandwidth (computing) , patch antenna , microstrip antenna , microwave , antenna factor , impedance matching , multi band device , antenna (radio) , physics , electronic engineering , engineering , acoustics , optics , electrical impedance , telecommunications
ABSTRACT A compact dual open‐loop antenna is proposed to provide enhanced bandwidth in near‐field applications in the ultra‐high frequency band. The antenna generates a strong and uniform magnetic field in a near‐field zone of the smaller open‐loop antenna. For increased bandwidth, two open loops with individual half‐wavelength perimeters are etched on each side of an FR4 printed circuit board. The antenna was fabricated in a compact overall size (dimensions, 60 × 60 × 0.8 mm 3 ) and achieves an interrogation zone of 50 × 50 mm 2 with good impedance matching and uniform magnetic field distribution in a 888–932 MHz band. Performance tests indicate that the proposed antenna has a reading distance of up to 130 mm for near‐field applications and is suitable for radio frequency identification reader applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2008–2012, 2015