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A hybrid technique for accurate modeling of very large antenna arrays including edge effects

A hybrid technique for accurate modeling of very large anten...

引用

IEEE Conference on Aerospace

作者： K.F. Sabet K.Y. Sze D. Chun EMAG Technologies Inc. Ann Arbor MI USA

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Implementation of the Z matrix interpolation in the method of moments for analysis of transient antennas excited by UWB pulses

Implementation of the Z matrix interpolation in the method o...

引用

International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, iWAT

作者： A.A. Lestari International Research Centre for Telecommunications and Radar (IRCTR) Faculty of Electrical Engineering Mathematics and Computer Science Dew University of Technology Delft Netherlands

In this paper, we implement the Z matrix interpolation technique for ultra-wideband (UWB) transient analysis of antennas excited by short pulses. This kind of analysis usually requires a much larger frequency range in comparison with analysis of wideband time-harmonic antennas. Due to stronger variation of currents at low frequencies down to DC, generally more frequency points are needed in the frequency range. In this work, we attempt to find a general rule of thumb for determining the optimal selection of frequencies for analysis of antennas excited by UWB pulses, using MoM with the Z matrix interpolation technique.

关键词： Transient analysis Interpolation Moment methods Ultra wideband antennas Frequency Transmission line matrix methods message-oriented middleware Radar antennas Time domain analysis Impedance

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Performance comparison of high-gain horn antennas

Performance comparison of high-gain horn antennas

引用

Antennas and Propagation Society International Symposium

作者： E. Lier J. Matthews Lockheed Martin Commercial Space Systems Newtown PA USA

High gain horns are used in multi-feed (cluster feed) reflector antennas, producing less spillover loss than conventional horns like dual-mode or corrugated horns. They can also be employed as an antenna element in limited-scan phased arrays, generating high aperture efficiency and good scan performance, and as a feed for quasi-optical amplifier arrays. The most promising high gain horns, high-gain hybrid-mode or "hard" horns and multi-mode horns, are compared with respect to their bandwidth potential. High-gain horns have, in general, considerably lower bandwidth than low-gain horns or "soft" horns. They have decreasing bandwidth and increasing aperture efficiency with increasing aperture diameter and with increasing dielectric constant of the wall material (hard horns). For apertures of about 3/spl lambda/, the hard corrugated horn yields the largest bandwidth, while for 4/spl lambda/ apertures, hard and multi-dielectric horns all exhibit similar bandwidth. The hard horns under study, although they are not optimized, exhibit approximately 50% higher bandwidth than the optimized multi-mode horns. The multi-dielectric horn yields considerably higher aperture efficiency than the other horns. The comparison study is not considered complete because of limited data being available.

关键词： Horn antennas Apertures Bandwidth Phased arrays message-oriented middleware Antenna feeds Antenna arrays Dielectric constant Dielectric materials Strips

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Physically-based method of moments for double-line-fed structures

Physically-based method of moments for double-line-fed struc...

引用

Asia-Pacific Conference on Microwave

作者： Xian Qi Lin Zhi Guo Qian Tie Jun Cui Center for Computational Electromagnetics and State Key Laboratory of Millimeter Waves South-East University Nanjing China

ISBN: (纸本)078039433X

In this paper, a physically-based numerical model is proposed to analyze single/double line-fed patch antennas and circuits based on the method of moments (MOM), where the number of unknowns can be significantly reduced using simplified meshes. In the proposed model, two kinds of new basis functions are used to describe the currents on the feedlines and the feedline-patch junctions. The accuracy and efficiency of the improved MOM model are illustrated by numerical results.

关键词： Moment methods message-oriented middleware Microstrip Numerical models Computational electromagnetics Laboratories Millimeter wave circuits Millimeter wave technology Patch antennas Integral equations

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Enhancing radio coverage inside buildings

Enhancing radio coverage inside buildings

引用

Antennas and Propagation Society International Symposium

作者： D.C. Kemp C. Martel M. Philippakis M.W. Shelley R.A. Pearson I. Llewellyn ERA Technology Limited Surrey UK

ISBN: (纸本)0780388836

In radio networks, cell sizes are determined by the power needed to provide an acceptable signal-to-noise ratio to a certain percentage of a given coverage zone. Propagation within buildings introduces losses to the system. If the losses can be minimised, it is possible to use lower power levels, while still covering the same region, and increase the overall spectrum efficiency of the network. Theoretical and experimental work has been performed to show that propagation within buildings can be greatly improved by using techniques based on frequency selective surfaces (FSS). A novel structure is proposed that has the potential to enhance the propagation in corridors and stairwells. The structure, mode conversion FSS (MC-FSS), is highly efficient and converts and re-radiates the specular energy in a predefined direction away from the specular direction. The structure can easily be retrofitted into existing buildings, with minimal structural impact, and can be fabricated using very low cost materials. The technology has been demonstrated at 870 MHz but could be very useful for much higher frequency applications, for example future MM-wave wireless LAN systems.

关键词： Frequency selective surfaces Radio frequency Buildings message-oriented middleware Packaging Bridges Radio network Signal to noise ratio Propagation losses Electromagnetic wave absorption

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An alert communication infrastructure for a decentralized attack prevention framework

An alert communication infrastructure for a decentralized at...

引用

International Carnahan Conference on Security Technology

作者： J. Garcia J. Borrell M.A. Jaeger G. Muhl DEIC Autonomous University of Barcelona Bellaterra Catalonia Spain KBS Berlin University of Technology Berlin Germany

The cooperation between the different entities of a decentralized prevention system can be solved efficiently using the publish/subscribe communication model. Here, clients can share and correlate alert information about the systems they monitor. In this paper, we present the advantages and convenience in using this communication model for a general decentralized prevention framework. Additionally, we outline the design for a specific architecture, and evaluate our design using a freely available publish/subscribe message oriented middleware

关键词： Peer to peer computing message-oriented middleware Communication system security Computer security message passing Routing Knowledge based systems Monitoring Information security Computer networks

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Hierarchical and federated network management for tactical environments

Hierarchical and federated network management for tactical e...

引用

MILCOM, Military Communications Conference

作者： H. El-Damhougy H. Yousefi'zadeh D. Lofquist R. Sackman J. Crowley The Boeing Company USA Boeing Co Chicago IL US

Global information grid (GIG) is becoming a reality with emerging state-of-the-art communication system infrastructure. In this paper, we describe issues facing both global and tactical network managers. We also propose a model for developing a global network management architecture. The main elements of our proposed model include network management (NM) concept of operations (CONOPS), requirement space, technical reference architecture, reference design, and implementation/development framework. We further describe the key areas that an integrated NM CONOPS must address.

关键词： Environmental management Technology management Writing message-oriented middleware Monitoring Open systems Network topology Protocols Distributed control Control systems

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Enhancing presentation level integration of remote applications and services in Web portals

Enhancing presentation level integration of remote applicati...

引用

IEEE International Conference on Services Computing (SCC)

作者： R. Weinreich T. Ziebermayr University of Linz Austria

Web portals are a means for presentation level integration of enterprise applications and services. We describe an approach for enhancing presentation level integration in Web portals by supporting communication between presentation level components. The approach is based on established standards in this area and allows the exchange of structured XML-data between local and remote applications and services. Since the approach is mostly declarative, it can also be used for improving integration of already existing presentation components.

关键词： Portals Logic User interfaces Engines Standardization Web services Web pages Information systems Database systems message-oriented middleware

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Fast FEM analysis of patch antenna using well-conditioned asymptotic waveform evaluation

Fast FEM analysis of patch antenna using well-conditioned as...

引用

Antennas and Propagation Society International Symposium

作者： Yong-ling Ban Zai-ping Nie College of Electronic Engineering University of Electronic Science and Technology Chengdu China

ISBN: (纸本)0780388836

The vector finite element-boundary integral method is adopted to formulate the radiation problem for the cavity-backed patch antenna. A robust well-conditioned asymptotic waveform evaluation (WCAWE) is employed to realize fast computing of input impedance of the patch antenna over a wide frequency band. Numerical results are presented to illustrate the robustness of the WCAWE.

关键词： Patch antennas Frequency Impedance Robustness Finite element methods Dielectric substrates Integral equations Taylor series message-oriented middleware Bandwidth

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Adaptive cross approximation for MOM matrix fill for PC problem sizes to 157000 unknowns

Adaptive cross approximation for MOM matrix fill for PC prob...

引用

IEEE/ACES International Conference on Wireless Communications and Applied Computational Electromagnetics

作者： J. Shaeffer F. Canning Marietta GA USA Simply Sparse슮 Technologies Morgantown WV USA

Recent work on sparse MOM codes for PC applications has reduced LU matrix factorization time to significantly less than matrix fill for problem unknowns approaching 200,000. This paper reports on the use and results of applying the recently developed adaptive cross approximation for significantly reducing MOM matrix fill time. Results suggest that when problem sizes approach 500,000 unknowns, matrix fill can be reduced from 100 to 10 hours on a modern PC.

关键词： message-oriented middleware Sparse matrices Matrix decomposition Canning Personal communication networks Computer interfaces Large-scale systems Testing Contracts Singular value decomposition

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