Compact Crossed Dipole Antenna With Meandered Series Power Divider for UHF RFID Tag and Handheld Reader Devices
Compact Crossed Dipole Antenna With Meandered Series Power Divider for UHF RFID Tag and Handheld Reader Devices
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DOI：
10.1109/tap.2019.2905926
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发表时间：
2019-03
影响因子：
5.7
通讯作者：
D. Inserra;G. Wen
中科院分区：
文献类型：
--
作者：
D. Inserra;G. Wen
A low-profile and meandered crossed dipole antenna design for ultrahigh-frequency (UHF) radio-frequency identification (RFID) circularly polarized (CP) tag or handheld reader application is described in this communication. The crossed dipole CP condition is obtained by employing a series power divider meandered at the center of the dielectric substrate, and a surrounding ring which acts as a T-match network guarantees impedance matching. The series power divider alleviates the problem of using a balun when the crossed dipole is fed with a 50 $\Omega $ coaxial cable. A prototype has been manufactured on a $56\times 56\times0.4\,\,\text {mm}^{3}$ FR4 dielectric substrate, and the measurement results show a $S_{11}\le -10$ dB bandwidth of more than 14.4% (865.6–1000 MHz), an axial ratio (AR) ≤ 3 dB bandwidth of 2.8% (906–932 MHz) which can essentially cover the Federal communications commission (FCC) UHF RFID band, and a broadside RHCP peak gain of 1.4 dBic at 919 MHz. When the antenna is connected to an RFID tag chip, excellent read range performance within the whole 902–928 MHz bandwidth has been demonstrated (with maximum values of 7 and 9.9 m when interrogated with a linearly polarized and a CP reader antenna, respectively).
