A capacitively-loaded loop antenna for UHF near-field RFID reader applications

Author

Dhaouadi, M. ; Mabrouk, M. ; Vuong, T.P. ; de Souza, A.C. ; Ghazel, A.

Author_Institution

GRESCOM Lab., Univ. of Carthage, Carthage, Tunisia

fYear

2015

fDate

25-28 Jan. 2015

Firstpage

193

Lastpage

195

Abstract

In this work, we present a compact capacitively-loaded loop antenna for Ultra-High Frequency (UHF) near-field radio frequency identification (RFID) reader applications. The antenna structure is composed by folded-dipole loop structure with two C-arms and miniaturized to small size of 40 × 36 × 1.6 mm³ for RFID applications. Our bandwidth measurement of antenna prototype is 10.5 MHz from 865-875.5 MHz with reflection coefficient less than 10 dB, which covers all of Europe RFID Band (865-868 MHz). Furthermore, a capacitive loading through two C-arms is created inside the loop antenna and has an effect of increasing the electrical length of the antenna structure. Therefore, the proposed antenna can be dedicated to different UHF RFID bands by varying the C-arm parameters. The measured reading capability of our antenna is up to 7 cm for near-field RFID Tag, and our measurements show this antenna is suitable for UHF near-field RFID reader applications.

Keywords

HF antennas; UHF antennas; dipole antennas; loop antennas; radiofrequency identification; C-arm parameters; Europe RFID band; UHF RFID bands; UHF near-field RFID reader applications; bandwidth 10.5 MHz; bandwidth measurement; compact capacitively-loaded loop antenna; electrical length; folded-dipole loop structure; frequency 865 MHz to 868 MHz; near-field RFID tag; reflection coefficient; ultra-high frequency near-field radio frequency identification reader; Antenna measurements; Dipole antennas; Frequency measurement; Loss measurement; Radiofrequency identification; UHF antennas; UHF measurements; Near-field; RF identification (RFID); reader antenna;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Symposium (RWS), 2015 IEEE

Conference_Location

San Diego, CA

Type

conf

DOI

10.1109/RWS.2015.7129755

Filename

7129755