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Andrenko A.S.,SYSU CMU Shunde International Joint Research Institute
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2015

This paper presents the design of UHF RFID read/write (R/W) antenna for the variety of smart shelf retail applications. Antenna operation is based on the EM coupling between the open-ended or shorted MS feed line and periodic planar metal strips of certain layout. The proposed antenna can be easily customized for the required volume of smart shelf RFID interrogation. Several antenna prototypes have been designed, produced and measured. The antenna performance has been evaluated in UHF RFID system for the simultaneous detection of arbitrary oriented tagged apparel items placed on the antenna surface. The proposed antenna demonstrates excellent ability to provide strong and uniform E-field distribution at the distances up to 50 cm form the antenna surface. © 2015 IEEE.

Li M.,Sun Yat Sen University | Li M.,SYSU CMU Shunde International Joint Research Institute
ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings | Year: 2015

This paper presents a generalized i-vector representation framework using the mixture of Gaussian (MoG) factor analysis for speaker verification. Conventionally, a single standard factor analysis is adopted to generate a low rank total variability subspace where the mean supervector is assumed to be Gaussian distributed. The energy that can't be represented by the low rank space is modeled by a single multivariate Gaussian. However, due to the sparsity of the frame level posterior probability and the short duration characteristics, some dimensions of the first-order statistics may not be Gaussian distributed. Therefore, we replace the single Gaussian with a mixture of Gaussians to better represent the residual energy. Experimental results on the NIST SRE 2010 condition 5 female task and the RSR 2015 part 1 female task show that the MoG i-vector outperforms the i-vector baseline by more than 10% relatively for both text independent and text dependent speaker verification tasks, respectively. © 2015 IEEE.

Zhang J.,Sun Yat Sen University | Long Y.,SYSU CMU Shunde International Joint Research Institute
IEEE Transactions on Antennas and Propagation | Year: 2014

A novel dual-layer electrically small radio-frequency-identification (RFID) tag antenna is proposed for metallic object applications. With a proximity-coupled feed method, two rotationally symmetric loaded via-patches are fed through an embedded dual-element planar inverted-F antenna (PIFA) array. With this configuration, the antenna volume is reduced to 0.08 λ × 0.04 λ × 0.007 λ while the measured antenna gain is 0.08 dBi at the frequency of 923 MHz. Studies demonstrate that the proposed antenna is a good candidate for ultra-high-frequency RFID tags to be mounted on metallic surfaces, especially in size-constrained scenarios. Meanwhile, a figure of merit, namely, NBG, is presented, with which a comparison among electrically small tag antennas is carried out. Finally, several guidelines are given out to facilitate the miniaturization of RFID tag antennas for metallic object applications. © 2014 IEEE.

Zhang J.,Sun Yat Sen University | Long Y.,SYSU CMU Shunde International Joint Research Institute
IEEE Antennas and Wireless Propagation Letters | Year: 2013

In this letter, a dual-layer radio frequency identification (RFID) tag antenna is proposed. By embedding a slotted via-patch in the middle layer, the proposed antenna is miniaturized to a total volume of 28×14×3.2 mm3. At the same time, the loaded via-patch makes the antenna input impedance be flexibly tuned in a large scale. Moreover, an equivalent circuit model is given out to explicate how this via-patch functions. The measured read ranges with and without a metallic plate were 1.8 and 2 m, respectively, which implies the proposed antenna is a good candidate in metallic object applications, especially in size-constrained scenarios. © 2002-2011 IEEE.

Andrenko A.S.,SYSU CMU Shunde International Joint Research Institute
Proceedings of the 2015 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications, IEEE APWC 2015 | Year: 2015

This paper presents the EM analysis and design of a frequency reconfigurable antenna for the mobile handset and wireless terminal applications. The proposed antenna has a simple planar layout and utilizes RF switches to provide the multiband frequency reconfigurable capabilities. Two designs are presented and their multimode antenna performances within the 0.8 to 2.45 GHz band are analyzed in terms of current density distributions and radiation characteristics. © 2015 IEEE.

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