Title :
Wideband double-UT RFID tag antenna design
Author :
Tan, Juanjuan ; Li, Xiuping
Author_Institution :
Sch. of Electron. Eng., Beijing Univ. of Posts & Telecommun., Beijing
fDate :
Nov. 30 2008-Dec. 3 2008
Abstract :
A new double-UT tag antenna in UHF band is proposed by adding a double-U patch to a double-T antenna in order to obtain wideband performance. The original double-T antenna presents 80 MHz bandwidth under the condition of voltage standing wave ratio less than 2 (VSWR<2). Meanwhile, the new antenna shows bandwidth of 102 MHz (VSWR<2), with dimension of 89.2 mm times 29.0 mm, 1.93 dBi gain and 84deg half-power beamwidth (HPBW). The equivalent circuit is presented to explain the working principle of the double-UT tag antenna. The equivalent circuit model results and the Electromagnetic ( EM ) simulated results agree well. By tuning the double-T matching network, the new type antenna can be matched to different RFID chips.
Keywords :
UHF antennas; broadband antennas; equivalent circuits; impedance matching; microstrip antennas; radiofrequency identification; UHF band; bandwidth 102 MHz; bandwidth 80 MHz; double-T antenna; double-T matching network; double-U patch antenna; electromagnetic simulation; equivalent circuit; half-power beamwidth; impedance matching; size 29.0 mm; size 89.2 mm; voltage standing wave ratio; wideband double-UT RFID tag antenna design; Bandwidth; Broadband antennas; Circuit optimization; Circuit simulation; Electromagnetic modeling; Equivalent circuits; RFID tags; Radiofrequency identification; UHF antennas; Voltage; double-T antenna; double-U patch; double-UT antenna; impedance matching;
Conference_Titel :
Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Conference_Location :
Macao
Print_ISBN :
978-1-4244-2341-5
Electronic_ISBN :
978-1-4244-2342-2
DOI :
10.1109/APCCAS.2008.4746255
