Title :
A compact RFID tag antenna using miniaturized patch structure for metallic object applications
Author :
Chen-Hsuan Chiang ; Tzu-Heng Cheng ; Shih-Yuan Chen
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
A compact RFID tag antenna suitable for metallic object applications is proposed. The antenna structure is based on a quarter-wavelength patch with one end open and the other short-circuited. Narrowing the vertical shorting wall can adjust the input impedance of the antenna while exciting the same resonant mode. The patch length can be further reduced by applying a pair of vertical thin strips or small inductance at the upper ends of the resonating edges. Besides, a section of high-impedance line is connected in series with the patch to increase the input inductance. A prototype design of dimensions 60 mm × 30 mm is designed for conjugate matched to the Alien H3 RFID tag chip at 915 MHz. It is fabricated on a 1.6-mm FR4 substrate, assembled with the Alien chip, and mounted onto a 150 mm × 150 mm metallic sheet. The prototype is tested to have a maximum read range of 70-cm, comparable to the 200-cm read range of a commercially available RFID Alien tag measured under the same setup but without the metallic sheet.
Keywords :
UHF antennas; antenna testing; microstrip antennas; radiofrequency identification; Alien H3 RFID tag chip; FR4 substrate; antenna testing; compact RFID tag antenna; frequency 915 MHz; metallic object application; metallic sheet; miniaturized patch structure; quarter-wavelength patch antenna; size 1.6 mm; size 200 cm; size 70 cm; vertical shorting wall; vertical thin strip; Antenna measurements; Antennas; Impedance; Inductance; Prototypes; Radio frequency; Radiofrequency identification;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE
Conference_Location :
Memphis, TN
Print_ISBN :
978-1-4799-3538-3
DOI :
10.1109/APS.2014.6905081