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New Farm, Australia

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Alpha Technologies Ltd. and Argus Technologies | Date: 2006-09-12

power supplies, rectifiers, and controllers for power systems.


Ye G.-P.,Zhanjiang Normal University | Wu Z.-H.,Argus Technologies
Progress In Electromagnetics Research M | Year: 2012

In this paper, transient electromagnetic scattering by general Chiral objects is investigated using time-domain integral equations with the Poggio, Miller, Chang, Harrington, Wu, and Tsai (PMCHWT) formulations. By introducing a pair of equivalent electric and magnetic currents, electromagnetic fields inside a homogeneous Chiral region can be represented by these sources over its boundary. The uncoupled equations are solved numerically by the Galerkin's method that involves separate spatial and temporal testing procedures. The scaled Laguerre functions are used as the temporal basis and testing functions. The use of the Laguerre functions completely removes the time variable from computation, and the results are stable even at late times. Numerical results are presented and compared with analytical results, and good agreements are observed. Source


Zhu H.,South China University of Technology | Wu Z.-H.,Argus Technologies | Zhang X.-Y.,South China University of Technology | Hu B.-J.,South China University of Technology
Progress In Electromagnetics Research B | Year: 2011

Electromagnetic radiation by dipole antenna loaded with general bi-isotropic objects is investigated using time-domain integral equations. By introducing pairs of equivalent electric and magnetic sources, electromagnetic fields inside a homogeneous bi-isotropic region can be represented by these sources over its boundary. A series of coupled surface integral equations are obtained after imposing boundary conditions. These equations are solved numerically by the Galerkin's method that involves separate spatial and temporal testing procedures. The scaled Laguerre functions are used as the temporal basis and testing functions. The use of the Laguerre functions completely removes the time variable from computation, and the results are stable even at late times. Numerical results are presented and compared with analytical results, and similarities and differences are observed. Source


Deng J.-Y.,Xidian University | Guo L.-X.,Xidian University | Yin Y.-Z.,Xidian University | Qiu J.,Argus Technologies | Wu Z.-S.,Xidian University
IEEE Transactions on Antennas and Propagation | Year: 2013

A novel tuned loop feed for patch antennas is described. The arrangement provides a symmetrical excitation of the patch with a double tuned response with enhanced bandwidth. The tuned loop together with the patch can be seen as a band pass filter comprising a series resonator and parallel resonator tuned to the same frequency. The tuned loop can easily be implemented as a microstrip PCB. A dual polarized patch antenna can be designed for diversity reception using this technique. Measured results are given, showing that this feed is effective in broadening the bandwidth of patch antennas. This configuration is a good candidate for radiating elements in cellular base station antennas. © 1963-2012 IEEE. Source


Wu Z.-H.,City University of Hong Kong | Wu Z.-H.,Argus Technologies | Yung E.K.-N.,City University of Hong Kong | Wang D.-X.,City University of Hong Kong | Bao J.,City University of Hong Kong
IEEE Transactions on Antennas and Propagation | Year: 2012

Electromagnetic scattering by general bi-isotropic objects is calculated by using the time-domain integral equations which are incorporated with the Poggio-Miller-Chang-Harrington- Wu-Tsai (PMCHWT) formulations. By introducing a pair of equivalent electric and magnetic sources, electromagnetic fields inside a homogeneous bi-isotropic region can be represented by these sources over its boundary after applying fields splitting method. A series of coupled surface integral equations are obtained after imposing boundary conditions. These equations are then solved numerically using the method of moment (MoM) which involves separate spatial and temporal testing procedures. The Rao-Wilton-Glisson (RWG) functions are used as the spatial expansion and testing functions, and the weighted Laguerre functions are derived as the temporal basis and testing functions. Numerical results such as transient currents, far scattered fields, and normalized radar cross sections are presented and compared with analytical results as well as MoM-based frequency-domain analysis, and good agreements are observed. © 2011 IEEE. Source

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