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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.


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.


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.


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.


Patent
Argus Technologies | Date: 2012-09-28

Disclosed is an antenna system having an approximately omni-directional radiation pattern. The antenna system comprises an antenna comprising a plurality of columns disposed in parallel with equal spacing in a circular configuration. Each column comprises an elongated ground plane; an outwards-facing array comprising a plurality of antenna elements mounted on the ground plane iri a linear configuration parallel to the longitudinal edges of the ground plane, each antenna element comprises two feeds configured to produce orthogonally polarised radiation; a first input connected to the feeds configured for a first polarisation; and a second input connected to the feeds configured for a second, polarisation. The antenna system further comprises a feeding network comprising a first circuit network and a second circuit network. The first inputs of the columns are connected to respective outputs of the first circuit network, and the second inputs of the columns are connected to respective outputs of the second circuit network. Each circuit network is adapted to impart a phase shift to each of two inputs to the circuit network that increments between the outputs of the circuit network by a multiple of 360 divided by the number of columns.


Patent
Argus Technologies | Date: 2011-04-14

Wideband radiating elements, methods of transmitting and receiving signals using a wideband radiating element, standalone antennas, and array antennas are disclosed. The wideband radiating element (antenna) has wide bandwidth for a relatively constant beamwidth and comprises a section of waveguide, a patch radiator, and one or more tuned loops. The wideband radiating element may comprise: a section of waveguide, at least one dipole antenna element, and at least one tuned circuit. Each dipole antenna element is disposed within the waveguide section as a feed for the waveguide section.


Trademark
Andrew Llc and Argus Technologies | Date: 2013-01-08

Telecommunications apparatus, namely, antennas, amplifiers; apparatus for transmission or reproduction of sound or images; antennas for wireless based communication systems; parts, fittings and components for antennas, amplifiers and integrated antenna systems, namely, diplexers, network combiners, couplers, splitters, cable assemblies, cable termination panels, cable outdoor termination units, downtilt control kits and mounting kits; none of the foregoing goods includes cameras, projectors, photographic printers and enlargers and microfilm readers and none of the foregoing goods being DC power plants, rectifiers, DC/DC converters, power system controllers, low voltage load and battery disconnect, associated DC distribution equipment and buses and energy storage devices. Telecommunications consultation services in relation to antennas for use in cellular telephone networks and in other telecommunication systems, but excluding such services provided by way of railway infrastructure and the transmission of messages and data concerning goods in transit and their location by telephone and computer.


Argus Technologies | Entity website

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Argus Technologies | Entity website

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