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Flexible wideband UHF RFID tag antenna for curved metal surfaces

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3 Author(s)
Son, H.-W. ; Div. of Electron. & Inf. Eng., Chonbuk Nat. Univ., Jeonju, South Korea ; Jeon, H.-G. ; Cho, J.-H.

A low-cost, wideband, flexible antenna for radio frequency identification tags mountable on curved metal surfaces is presented. The antenna consists of a label-type patch adhering to a flexible polyvinyl chloride substrate. A novel balanced feed method using two orthogonal slits on the patch is proposed to perform simple and wideband impedance matching between the antenna and a tag chip. A prototype antenna was fabricated and tested with a commercial tag chip. It has a 3 dB return loss bandwidth of 70 MHz and a uniform read range of over 9.7 m in the 902 - 928 MHz range when it is mounted on a cylindrical metal plate with a radius of curvature of 150 mm.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 13 )