Title :
Wideband RFID Tag Antenna for Metallic Surfaces Using Proximity-Coupled Feed
Author :
Son, Hae-Won ; Jeong, Seung-Hwan
Author_Institution :
Div. of Electron. & Inf. Eng., Chonbuk Nat. Univ., Jeonju, South Korea
fDate :
7/3/1905 12:00:00 AM
Abstract :
A low-cost, wideband patch antenna for radio frequency identification tags mountable on metallic surfaces is presented. A novel proximity-coupled feed structure, in which the direction of the microstrip feed line is parallel to that of the resonant length of the radiating patch and one end of the feed line is shorted to the ground, is proposed to perform simple and wideband impedance matching between the antenna and tag chip without any additional matching networks. The proposed design is verified by simulation and measurement. The measured 3-dB return-loss bandwidth is about 49 MHz, which totally covers the 26-MHz bandwidth requirement in North America. The measured read range is about 8.9 m when the tag antenna is mounted on a metal plate with a size of 200 × 200 mm2.
Keywords :
antenna feeds; antenna radiation patterns; broadband antennas; electromagnetic coupling; impedance matching; microstrip antennas; radiofrequency identification; frequency 26 MHz; low cost wideband patch antenna; matching network; metal plate; metallic surface; microstrip feed line; patch radiation; proximity coupled feed structure; radio frequency identification tags; resonant length; return loss bandwidth; tag chip; wideband RFID tag antenna; wideband impedance matching; Antenna feeds; Antenna measurements; Bandwidth; Impedance; Radiofrequency identification; Surface impedance; Proximity-coupled feed; radio frequency identification (RFID); tag antenna; wideband antenna;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2011.2148151
