TY - JOUR
T1 - A Wideband Single-Fed, Circularly-Polarized Patch Antenna with Enhanced Axial Ratio Bandwidth for UHF RFID Reader Applications
AU - Li, Junlong
AU - Liu, Hui
AU - Zhang, Shuai
AU - Luo, Miaohui
AU - Zhang, Yuan
AU - He, Sailing
PY - 2018/10
Y1 - 2018/10
N2 - A wideband single-fed, circularly-polarized patch antenna with enhanced axial ratio bandwidth for RFID reader application is proposed. The antenna consists of a modified half E-shaped patch, a near-field resonant parasitic (NFRP) patch, and four rotated vertical metallic plates on the ground plane. The metallic plates surrounding the main radiator of the modified half E-shaped patch antenna are fabricated vertically on the ground plane. The operating frequency of the antenna decreases substantially with the vertical metallic plates, which is important for miniaturization of RFID applications. With an elliptical slot and a cut on the modified half E-shaped patch, antenna impedance bandwidth and CP performance both improve. A truncated corner patch as an NFRP element can generate an additional CP radiation mode and further enhances the axial ratio and impedance bandwidth. The measured results show that the antenna has an impedance bandwidth of 14.2% (833-960MHz), a 3-dB AR bandwidth of 9.0% (846-926MHz), and an average gain of 7.3 dBi over a 3dB AR bandwidth. The proposed antenna has a compact size and a low profile ( 0.45λ×0.45λ×0.074λ).
AB - A wideband single-fed, circularly-polarized patch antenna with enhanced axial ratio bandwidth for RFID reader application is proposed. The antenna consists of a modified half E-shaped patch, a near-field resonant parasitic (NFRP) patch, and four rotated vertical metallic plates on the ground plane. The metallic plates surrounding the main radiator of the modified half E-shaped patch antenna are fabricated vertically on the ground plane. The operating frequency of the antenna decreases substantially with the vertical metallic plates, which is important for miniaturization of RFID applications. With an elliptical slot and a cut on the modified half E-shaped patch, antenna impedance bandwidth and CP performance both improve. A truncated corner patch as an NFRP element can generate an additional CP radiation mode and further enhances the axial ratio and impedance bandwidth. The measured results show that the antenna has an impedance bandwidth of 14.2% (833-960MHz), a 3-dB AR bandwidth of 9.0% (846-926MHz), and an average gain of 7.3 dBi over a 3dB AR bandwidth. The proposed antenna has a compact size and a low profile ( 0.45λ×0.45λ×0.074λ).
KW - Circular polarization
KW - Compact
KW - Low profile
KW - Modified half E-shaped patch antenna
KW - UHF radio frequency identification
KW - Vertical rotated metallic plate
UR - http://www.scopus.com/inward/record.url?scp=85054410826&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2018.2872692
DO - 10.1109/ACCESS.2018.2872692
M3 - Journal article
SN - 2169-3536
VL - 6
SP - 55883
EP - 55892
JO - IEEE Access
JF - IEEE Access
M1 - 8478196
ER -