Open AccessCompact folded square‐loop antenna for reading near‐field RFID tags in blood sample tracking system
Author(s) -
Lin Y.F.,
Liao C.T.,
Chen H.M.,
Jiang Z.D.
Publication year - 2017
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2017.1859
Subject(s) - loop antenna , antenna (radio) , loop (graph theory) , square (algebra) , radio frequency identification , interrogation , dual loop , tracking (education) , sample (material) , reading (process) , electrical engineering , power (physics) , acoustics , optics , computer science , antenna factor , physics , antenna measurement , engineering , mathematics , pedagogy , computer security , law , history , archaeology , psychology , geometry , quantum mechanics , political science , thermodynamics , combinatorics
A highly compact (25 × 25 × 0.8 mm 3 ) dual‐band folded square‐loop antenna is proposed for reading near‐field RF identification (RFID) tags. The antenna has a strong and uniform magnetic field in the near‐field zone of the square loop. The side length of the square loop (∼ λ /16) generates resonant frequencies in two conventional modes (0.5 λ and 1.0 λ ). Experimental interrogation of a small RFID button tag attached to a blood sample collection tube showed that the antenna has a small interrogation zone (15 × 15 mm 2 ), which avoids unnecessary interrogation. Experiments also showed that with an input power of 25 dBm, the antenna can tag at a distance of up to 40 mm, which confirmed its suitability for reading button‐type RFID tags attached to blood sample collection tubes and other specimen containers.