The Experts below are selected from a list of 4212 Experts worldwide ranked by ideXlab platform
Zhongxiang Shen - One of the best experts on this subject based on the ideXlab platform.
-
UHF RFID Reader Antenna with Four Sub-Arrays for Near-Field and Far-Field Operations
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO), 2020Co-Authors: Zhongxiang Shen, Wong Loke LoongAbstract:A simple UHF RFID Reader Antenna is designed with four 1×2 Sub-arrays. Measured results show that an impedance bandwidth from 880 to 938 MHz is obtained, which can fully cover the UHF RFID working frequency (902 to 928 MHz). These four Sub-arrays could not only provide four strong E-field distributions around the near-zone region, but also have good far-field radiation patterns within the whole working band. This UHF RFID Reader Antenna can avoid the risk of tag dislocation in train tracking and positioning system.
-
dual band shared aperture uhf uwb rfid Reader Antenna of circular polarization
IEEE Transactions on Antennas and Propagation, 2018Co-Authors: Jun Zhang, Zhongxiang ShenAbstract:A dual-port, dual-band, and circularly polarized (CP) radio frequency identification Reader Antenna is designed to operate at both ultrahigh frequency (UHF) and lower ultra-wideband (UWB) bands for indoor positioning systems. In conjunction with a properly selected quadruple feed network, a shared aperture using the concept of hybrid mode is utilized for broadening the Antenna bandwidth. The concept is demonstrated to achieve a high gain, wideband, and CP operation within a low profile. The measured overlapping 3-dB axis ratio (AR) bandwidth and 10-dB impedance bandwidth for the UHF band ranges from 0.918 to 0.926 GHz with a minimum in-band Antenna gain of 9 dBic. The measured overlapping 3-dB AR bandwidth and 10-dB impedance bandwidth covers from 3 to 5.2 GHz with a minimum in-band gain of 9 dBic in the lower UWB band (i.e., 3.1–4.8 GHz). The gain suppression near the two wireless local area network bands (i.e., 2.45 and 5.8 GHz) is more than 20 dB. The isolation between two ports is larger than 25 dB over the UHF and lower UWB bands, respectively.
-
compact and high gain uhf uwb rfid Reader Antenna
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Jun Zhang, Zhongxiang ShenAbstract:A linearly polarized, dual-port, and dual-band radio frequency identification Reader Antenna is designed to simultaneously operate at ultrahigh frequency (UHF) and ultra-wideband bands for positioning systems. A hybrid design using patch and slot structures within a shared radiating aperture is proposed and demonstrated to achieve a high gain and wideband operation with a limited profile. The size of the total Antenna is 200 mm $\times200$ mm $\times10$ mm. The measured impedance bandwidth of the UHF Antenna ranges from 0.890 to 0.907 GHz with a minimum Antenna gain of 9 dBi. The measured impedance bandwidth of the ultra-wideband Antenna can cover the frequency band from 3 to 4.99 GHz with a minimum Antenna gain of 9 dBi. The Antenna gains near two WLAN bands are less than −15 dBi at 2.45 GHz and −5 dBi at 5.8 GHz, respectively. The mutual coupling between the two ports is less than −30 dB over the two bands.
Jun Zhang - One of the best experts on this subject based on the ideXlab platform.
-
dual band shared aperture uhf uwb rfid Reader Antenna of circular polarization
IEEE Transactions on Antennas and Propagation, 2018Co-Authors: Jun Zhang, Zhongxiang ShenAbstract:A dual-port, dual-band, and circularly polarized (CP) radio frequency identification Reader Antenna is designed to operate at both ultrahigh frequency (UHF) and lower ultra-wideband (UWB) bands for indoor positioning systems. In conjunction with a properly selected quadruple feed network, a shared aperture using the concept of hybrid mode is utilized for broadening the Antenna bandwidth. The concept is demonstrated to achieve a high gain, wideband, and CP operation within a low profile. The measured overlapping 3-dB axis ratio (AR) bandwidth and 10-dB impedance bandwidth for the UHF band ranges from 0.918 to 0.926 GHz with a minimum in-band Antenna gain of 9 dBic. The measured overlapping 3-dB AR bandwidth and 10-dB impedance bandwidth covers from 3 to 5.2 GHz with a minimum in-band gain of 9 dBic in the lower UWB band (i.e., 3.1–4.8 GHz). The gain suppression near the two wireless local area network bands (i.e., 2.45 and 5.8 GHz) is more than 20 dB. The isolation between two ports is larger than 25 dB over the UHF and lower UWB bands, respectively.
-
compact and high gain uhf uwb rfid Reader Antenna
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Jun Zhang, Zhongxiang ShenAbstract:A linearly polarized, dual-port, and dual-band radio frequency identification Reader Antenna is designed to simultaneously operate at ultrahigh frequency (UHF) and ultra-wideband bands for positioning systems. A hybrid design using patch and slot structures within a shared radiating aperture is proposed and demonstrated to achieve a high gain and wideband operation with a limited profile. The size of the total Antenna is 200 mm $\times200$ mm $\times10$ mm. The measured impedance bandwidth of the UHF Antenna ranges from 0.890 to 0.907 GHz with a minimum Antenna gain of 9 dBi. The measured impedance bandwidth of the ultra-wideband Antenna can cover the frequency band from 3 to 4.99 GHz with a minimum Antenna gain of 9 dBi. The Antenna gains near two WLAN bands are less than −15 dBi at 2.45 GHz and −5 dBi at 5.8 GHz, respectively. The mutual coupling between the two ports is less than −30 dB over the two bands.
Xiao Dong Chen - One of the best experts on this subject based on the ideXlab platform.
-
A Novel Multi-polarization UHF RFID Reader Antenna for Near-field Applications
2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting, 2020Co-Authors: Xiaojuan Ren, Yuan Yao, Yishan Liang, Xiao Dong ChenAbstract:A novel multi-polarized UHF RFID Reader Antenna for near-field applications is presented. Based on capacitive coupling and standing-wave structure, the Antenna is designed and fabricated by microstrip lines. By designing the number of units that consists of an Antenna, the interrogated area can be adjusted flexibly and easily. In the interrogated area, the Antenna can generate uniform and multi-polarization electric field distributions to detect arbitrarily oriented linearly polarized tags in the horizontal plane. The measured results show that the Antenna achieves impedance matching from 893 to 935 MHz.
-
design of a multipolarized rfid Reader Antenna for uhf near field applications
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yuan Yao, Yishan Liang, Xiao Dong ChenAbstract:This paper presents our investigation into a novel ultrahigh-frequency (UHF) radio frequency identification (RFID) multipolarized Reader Antenna based on a pair of symmetrical meandering open-ended microstrip lines for near-field applications. The near-field and multipolarization operation is achieved by introducing a 90° phase shift between the currents flowing along the opposite side of two branches. The proposed Antenna is shown to generate a uniform and strong electric field in its near-field region within a reading volume: $450~\text {mm} \times 450~\text {mm} \times 350$ mm ( $\text {width} \times \text {length} \times \text {height}$ ). The simulated and measured impedance bandwidths (−10 dB) agree very well, ranging from 825 to 965 MHz and covering the UHF RFID standard. In addition, it exhibits a low far-field gain, avoiding to misreading the tags outside the near-field region. The fabricated Antenna was fully tested with multiple tag Antennas that are placed in different orientations and even in a conveyor system, demonstrating a 100% reading rate of arbitrarily oriented tags within the reading zone.
-
a meander line uhf rfid Reader Antenna for near field applications
IEEE Transactions on Antennas and Propagation, 2017Co-Authors: Yuan Yao, Caixia Cui, Xiao Dong ChenAbstract:A novel ultrahigh frequency radio frequency identification Reader Antenna based on electromagnetic coupling between two open-ended microstrip (MS) meander lines for near-field applications is investigated in this paper. The corresponding currents flowing along the two MS meander lines are reversed in phase with approximately identical amplitudes. Meander-line units are introduced to achieve a uniform distribution of strong magnetic and electric fields. The performance of an Antenna prototype comprised of six pairs of meander lines is analyzed. The proposed Antenna simultaneously exhibits a uniform magnetic field distribution with a reading region of 480 mm $\times200$ mm $\times20$ mm and a uniform linear electric field distribution with a reading region of 480 mm $\times420$ mm $\times300$ mm. The proposed Antenna exhibits a low far-field gain, and has a bandwidth from 914 to 929 MHz. Both simulated and measured results have shown a good performance of the Antenna.
-
Design of a broadband UHF near-field RFID Reader Antenna
2016 IEEE International Conference on Microwave and Millimeter Wave Technology (ICMMT), 2016Co-Authors: Junsheng Yu, Xiao Dong Chen, Limei Qi, Zhijiao Chen, Hai Wang, Cheng YangAbstract:A wideband UHF RFID Reader Antenna with Wilkinson power divider and the composite left and right hand (CRLH) transmission lines is proposed. The Antenna is composed of a Wilkinson power divider, CRLH transmission lines, and two open-ended microstrip meander lines. The traditional Wilkinson power divider has a 1/4 wavelength band microstrip transmission line, as transmission line is a narrow band, it is not a broadband device. The Wilkinson power divider and the CRLH transmission lines are used to expand the bandwidth of the Antenna and to make a 180 degree phase shift. The proposed Antenna works from 860 MHz to 960 MHz with S11 less than -27 dB, including the entire UHF RFID band. Due to the wide band characteristic of the Antenna, it can be widely used in the different countries.
-
Design of a novel UHF RFID Reader Antenna for near-field applications
2015 IEEE International Symposium on Antennas and Propagation & USNC URSI National Radio Science Meeting, 2015Co-Authors: Caixia Cui, Yuan Yao, Xiao Dong ChenAbstract:A UHF RFID Reader Antenna for near-field applications is presented in this paper. The design is based on EM coupling between two open-ended microstrip meander lines. The corresponding currents flowing along the two microstrip meander lines are reverse direction with approximately identical amplitudes. The impedance bandwidth of the proposed Antenna is 15 MHz, from 914 MHz to 929 MHz. The results show that the Antenna has uniform magnetic field with the reading region of 200 mm × 480 mm × 20 mm and uniform linear electric field with the reading region of 420 mm × 420 mm × 300 mm. Due to the unique characteristics of the Antenna, it's suitable for the commercial near-field applications.
Philippe Pannier - One of the best experts on this subject based on the ideXlab platform.
-
Design of an Ultra-Wideband UHF RFID Reader Antenna for Wearable Ankle Tracking Applications
Progress In Electromagnetics Research C, 2020Co-Authors: Khodor Jebbawi, Matthieu Egels, Philippe PannierAbstract:In this paper, a broadband Reader Antenna is designed and manufactured for wearable ankle strap applications. The frequency range covered for S 11 < −10 dB is from 850 MHz to 1650 MHz with dipole like radiation pattern in free space. The proposed broadband Antenna is manufactured with a semi-flex (Taconic RF-35) and flexible (Kapton) substrates. A good agreement between simulations and measurements has been achieved. Prototypes performances have been tested by measuring the reading distance. The maximum reading distance obtained is about 1.46 m at 865 MHz with an output power of the transmitter (P T X) of 25 dBm. Results of functional RFID test show that the proposed Antenna can be used as an RFID Reader Antenna when it is placed on the ankle of the human body.
-
Design of an ultra-wideband UHF RFID Reader Antenna for wearable ankle tracking applications
2019Co-Authors: Khodor Jebbawi, Matthieu Egels, Philippe PannierAbstract:In this paper, an ultra-wideband (UWB) UHF RFID Reader Antenna is designed and manufactured for wearable ankle strap applications. The frequency range covered for a S 11 r ) and a 1.52 mm thickness (h). Many prototypes have been manufactured and a good agreement between simulations and measurements has been achieved. Prototype performance has been tested by measuring the reading distance. It is found that the proposed Antenna can be used as a RFID Reader Antenna when it is placed on the ankle of the human body.
Norbahiah Misran - One of the best experts on this subject based on the ideXlab platform.
-
A wideband UHF RFID Reader Antenna
2011 IEEE International RF & Microwave Conference, 2011Co-Authors: J. J. Tiang, M. T. Islam, Norbahiah Misran, J. S. Mandeep, C. L. ChooAbstract:This paper presents a new wideband RFID Reader Antenna for UHF application. By applying log periodic Antenna theory, the proposed Antenna is achieved by employing three loop wire elements and fed by a pair of crisscross feed line. The proposed Antenna exhibits wide bandwidth of 25.2 % operating frequency at UHF band from 811 MHz to 1046 MHz. The return loss and radiation pattern of the proposed Antenna are presented.
-
Design analysis of a dual frequency RFID Reader Antenna
International Review of Electrical Engineering-iree, 2010Co-Authors: Ahmed Toaha Mobashsher, Mohammad Tariqul Islam, Norbahiah MisranAbstract:In this paper, the analysis of design, fabrication and measurement of a high gain dual frequency RFID Reader Antenna, proposed for ISM bands of 2.45GHz and 5.8GHz, is discussed with overall explanations. The Antenna is composed of a U-shaped copper strip with unequal arm, a printed rectangular ring and the ground plane. The Antenna operates over 2.37GHz to 2.49GHz, of 120MHz for the lower band; while the upper band exhibits good impedance bandwidth of 420MHz (from 5.55GHz to 5.97GHz), where return loss of -10dB is taken as the reference for both bands. The U-shaped feeding strip excites the rectangular ring effectively by providing a good impedance matching with over 98% of efficiency in both the frequency bands and also 9.56 and 10.17dBi gain in the lower and higher frequency band, respectively. Furthermore, the analytical parametric study facilitates more elaboration of the design and optimization processes for the Antenna researchers.
