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2011 IEEE International Symposium on Antennas and Propagation(APSURSI 2011)

作者： Ming-Feng Xue Jian-Ming Jin Charles Macon Steven Wong Mark Kragalott Center for Computational Electromagnetics University of Illinois at Urbana-Champaign Urbana IL 61801 Air Force Research Laboratory Wright-Patterson Air Force Base OH 45433 High Performance Technologies Inc. Wright-Patterson Air Force Base OH 45433 Naval Research Laboratory Washington DC 20375

ISBN: (纸本)9781424495627;9781424495634

The electromagnetic dual-primal finite element tearing and interconnecting (FETI-DPEM) method is a non-overlapping domain decomposition method developed for the finite element analysis of large-scale electromagnetic problems. The method is particularly suitable for simulating large finite arrays because the geometrical repetitions of an array structure can be exploited to further enhance the computation performance. The method has been applied to the simulation of phased-array antennas in addition to other finite array structures. This paper presents the first experimental validation of this method for the simulation of a highly complicated realistic phased-array antenna. The antenna geometry is described in detail and the comparison between the simulated solution and experimental measurement is presented.

关键词： Vivaldi antenna phased array dual-polarized experimental measurement FETI-DPEM simulating Antenna arrays array structure ANTENNA Testing and Measurement Finite ELECTROMAGNETIC antenna phased arrays

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Radiative Properties in Planar Printed Vivaldi Antenna array

Radiative Properties in Planar Printed Vivaldi Antenna Array

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IEEE International Symposium on Antennas and Propagation

作者： Maria C. Gonzalez Electrical and Computer Engineering Department University of California Davis California

ISBN: (纸本)9781467304610

An array of three Vivaldi antennas, also called a planar horn design, is constructed using standard planar printing technology. The frequency range studied is between 2 and 12 GHz. The advantage of these structures is the design simplicity, cheap cost, small size, low weight, and portability for mobile applications. The characteristics of the pattern in the E and H planes for the individual antenna element and the array structure are presented here. For array structure, the separation between elements is a critical parameter that determines the mutual coupling and the overall array pattern in the far field due to the phase difference between antenna elements. The dependency of the beamwidth on the distance of separation between antenna elements is presented.

关键词： antenna element Vivaldi antennas array structure phase difference Planar Beam width critical parameter Portability Mutual coupling far-field arrays frequency ranges

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Ku-band Hybrid Phased array Antennas for Mobile Satellite Communication Systems

Ku-band Hybrid Phased Array Antennas for Mobile Satellite Co...

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European Conference on Antennas and Propagation

作者： Ferdinando Tiezzi Stefano Vaccaro Daniel Llorens Cesar Dominguez Manuel Fajardo JAST SA PSE-C

ISBN: (纸本)9781467321877

This paper presents an overview of the results of the development of a Ku-Band electronically steerable array antenna for Mobile Satellite Communications. The antenna is based on hybrid mechanical-electronic steerable array architecture. A summary of the design of a transmit/receive dual-aperture antenna and the latest validation results are presented. The antenna is applicable to broadband bi-directional SatCom systems and is particularly suitable for seamless installation on aircrafts and ground vehicles.

关键词： Ku-band Antenna Electronic Phased array Automatic Tracking Mobile Satellite Communication Bi-directional Superhigh frequency Satellite communication systems mobile satellite communication TWO-COMPONENT ANTENNA AUTOMATIC TRACKING antennae array structure Ground vehicles Aircraft antenna phased arrays

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Fistulography: A useful imaging modality for identifying the exact location and extent of complete branchial fistulas

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Ear, Nose and Throat Journal 2009年第9期88卷 1090-1094页

作者： Bist, Sampan Singh Varshney, Saurabh Kumar, Rakesh Gupta, Nitin Department of ENT-Head and Neck Surgery Himalayan Institute of Medical Sciences HIHT University Doiwala Dehradun Jolly Grant India

The patient underwent excision of the branchial fistula via a combined transcervical and transoral approach under general anesthesia. Because of the proximity of the tract to the patient's carotid arteries, a vas... 详细信息

关键词： Neck apparatus Diagnostic Imaging teratologic Developmental diagnostic imaging ARCHES fistulography Fistula lower part mucus discharge acute infection Neck Endoderm array structure

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An Efficient Architecture for Floating-Point Eigenvalue Decomposition 22

An Efficient Architecture for Floating-Point Eigenvalue Deco...

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22nd IEEE Annual International Symposium on Field-Programmable Custom Computing Machines ((FCCM)

作者： Wang, Xinying Zambreno, Joseph Iowa State Univ Dept Elect & Comp Engn Ames IA 50011 USA

ISBN: (纸本)9781479951116

Eigenvalue decomposition (EVD) is a widely-used factorization tool to perform principal component analysis, and has been employed for dimensionality reduction and pattern recognition in many scientific and engineering applications, such as image processing, text mining and wireless communications. EVD is considered computationally expensive, and as software implementations have not been able to meet the performance requirements of many real-time applications, the use of reconfigurable computing technology has shown promise in accelerating this type of computation. In this paper, we present an efficient FPGA-based double-precision floating-point architecture for EVD, which can efficiently analyze large-scale matrices. Our experimental results using an FPGA-based hybrid acceleration system indicate the efficiency of our novel array architecture, with dimension-dependent speedups over an optimized software implementation that range from 1.5x to 15.45x in terms of computation time.

关键词： arrays Field programmable gate arrays Jacobian matrices Matrix decomposition Singular value decomposition Symmetric matrices Eigenvalue Problem FPGA Systolic Architecture Field programmable gate arrays Symmetric matrix matrix decomposition Jacobian matrix EVD Singular value decomposition software implementation FLOATING POINTS array structure Computing technology arrays

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Wide-Angle Scanning Phased array Based on Microstrip Magnetic Dipole Yagi Sub-arrays

Wide-Angle Scanning Phased Array Based on Microstrip Magneti...

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IEEE International Symposium on Antennas and Propagation

作者： Ya-Qing Wen Bing-Zhong Wang Xiao Ding Ren Wang Inst. of Appl. Phys. Univ. of Electron. & Sci. Technol. of China Chengdu China

ISBN: (纸本)9781479978168

In order to extend scanning range of a microstrip planar phased array, a novel array structure based on microstrip magnetic dipole Yagi (MMD-Yagi) sub-arrays is presented in this paper. The MMD-Yagi sub-array antenna has a radiation pattern with double main lobes, which results in the coverage of 3dB beam-width reaching up to ±75°. A microstrip phased array composed of 8 MMD-Yagi sub-arrays with a large metal ground can scan its main lobe from -78° to +77° in the elevation plane with a gain fluctuation less than 4dB.

关键词： superconducting microstrips gain ripple Radiation patterns phased array main lobe array structure dipoles metal grinding planar phased array Coverage

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Overlapped digital subarray architecture for multiple beam phased array radar

Overlapped digital subarray architecture for multiple beam p...

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European Conference on Antennas and Propagation

作者： J. Herd S. Duffy MIT Lincoln Laboratory

ISBN: (纸本)9781457702501

MIT Lincoln Laboratory is conducting a technology demonstration of affordable Multifunction Phased array Radar (MPAR) technology for Next Generation air traffic control and national weather surveillance services. Aggressive cost and performance goals have been established for the system. The array architecture and its realization using custom Transmit and Receive Integrated Circuits and a panel-based Line Replaceable Unit (LRU) will be presented. A program plan for risk reduction and system demonstration will be outlined.

关键词： phased array radar multi-beam array structure array radar subarray Risk Reduction Programme planning

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Broadside 6-element Series-Fed Slot-Coupled Microstrip Antenna array

Broadside 6-element Series-Fed Slot-Coupled Microstrip Anten...

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IEEE International Symposium on Antennas and Propagation

作者： Bojana Zivanovic Thomas Weller Carlos Costas Center for Wireless and Microwave Information Systems University of South Florida Tampa FL USA Raytheon Company St. Petersburg FL USA

ISBN: (纸本)9781467304610

A C-band, six-element slot-coupled microstrip antenna array is presented. The array architecture employs a dual series feeding mechanism, where opposite ends of the array are fed with equal but anti-phase signals in order to maintain a broadside pattern over frequency. This approach facilitates the use of the 6-element panel in high gain, omni-directional arrays for airborne applications that require frequency-hopping capability. The elevation pattern stability is shown from 4.5 GHz to 5.5 GHz and the measured gain of the array is 12.6 dB.

关键词： microstrip antenna arrays array structure series-fed REVERSE PHASE arrays series feed

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Novel 3-D array Configuration based on CRLB Formulation for High-Resolution DOA Estimation

Novel 3-D Array Configuration based on CRLB Formulation for ...

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International Symposium on Antennas and Propagation

作者： Hiroki Moriya Koichi Ichige Hiroyuki Arai Takahiro Hayashi Hiromi Matsuno Masayuki Nakano Department of Electrical and Computer Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan Wireless Platform Laboratory KDDI R&D Laboratories 2-1-15 Ohara Fujimino Saitama 356-8502

ISBN: (纸本)9781467310017

Direction-Of-Arrival (DOA) estimation is one of significant techniques for high-speed mobile communication to know wave propagation environment [1]. High resolution DOA estimation algorithms like MUSIC [2], and ESPRIT [3] have already been widely used in many wireless communication applications. Generally planar array structures are used for 2-D DOA estimation. Planar arrays often well estimate azimuth angles but cannot well estimate elevation angles because of short antenna aperture in elevation direction. Therefore we try to develop a 3-D array configuration which well estimate both azimuth and elevation angles.

关键词： Direction of arrival estimation aperture antennas azimuth mobile communication Planar antennas wave propagation Angle array structure Azimuthal angle COMMUNICATIONS APPLICATION

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Influence of antenna array constellation on the accuracy of angle-of-arrival estimation in a multipath environment

Influence of antenna array constellation on the accuracy of ...

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WSA 2015;19th International ITG Workshop on Smart Antennas

作者： Thomas Lindner Niels Hadaschik Lucila Patino-Studencka Joern Thielecke Friedrich-Alexander-Universitat Erlangen-Nurnberg (FAU) Institute of Information Technology (Communication Electronics) Fraunhofer Institute for Integrated Circuits (IIS)

Angle-of-arrival estimation is a widely used localisation method. However, multipath propagation leads to decreased performance. In this paper an expression for the Cramer- Rao lower bound for angle-of-arrival estimation with a known transmitted signal in a two path environment is derived. The influence of array structure on the achievable accuracy and the capability of signal separation is investigated. It is shown that sparse array structures provide a lower Cramer-Rao bound as long as uniqueness is preserved.

关键词： Angle-of-arrival array structure Multipath propagation Cramer-Rao lower bound Multipath propagation Angle of arrival array structure Direction of arrival estimation Cramer-Rao bounds Source separation Antenna arrays

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