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Compact shorted C‐shaped patch antenna for ultrahigh frequency radio frequency identification tags mounted on a metallic plate
Author(s) -
Nguyen MinhTan,
Lin YiFang,
Chang ChunHsien,
Chen ChienHung,
Chen HuaMing
Publication year - 2021
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.22595
Subject(s) - antenna (radio) , radio frequency identification , ultra high frequency , ground plane , antenna tuner , acoustics , resonator , patch antenna , electrical impedance , electrical engineering , radio frequency , materials science , microstrip antenna , coaxial antenna , physics , engineering , computer science , computer security
This paper describes an ultrahigh frequency (UHF) tag antenna mounted on a metallic plate for radio frequency identification (RFID). The impedance of the proposed antenna can be tuned using various methods. The compact patch antenna consists of a C‐shaped resonator and a ground plane connected to a small shorting wall and is connected to a feeding loop in the middle of the C‐shaped resonator. Etching a couple of slits close to the shorting wall and a slot in the center of the C‐shaped resonator provided a flexible method for adjustment to match the conjugate impedance with the UCODE 8/8 m chip (13 − j191 Ω at 915 MHz). The optimal design with an overall size of 30 × 30 × 3 mm 3 (0.092 λ 0 × 0.092 λ 0 × 0.0092 λ 0 ) yielded a high power transmission coefficient of 91% and reading range of 6.4 m for the effective isotropic radiated power (EIRP) of 4.0 W when the tag antenna was mounted on a 220 × 220 mm 2 metal plate. The proposed antenna was designed at standard frequency bands of the Federal Communications Commission (FCC, 902‐928 MHz) for North America and Taiwan. Antenna fabrication and testing were performed, which revealed that the measured data were in good agreement with the simulation results.