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IEEE Photonics Conference (IPC)

作者： V. Vusirikala B. Gopalan S. Kareenahalli M. Dagenais C.E.C. Wood D. Stone Department of Electrical Engineering and Joint Program for Advanced Electronic Materials University of Maryland College Park MD USA Laboratory of Physical Science College Park MD USA

In this paper, we propose and demonstrate a simple GaAs-AlGaAs SQW laser employing conventional growth and processing techniques. In this laser, the transverse spot size has been increased by the use of a diluted waveguide (Al mole fractions are graded from 30% in the core to 31% in the cladding). This laser butt-couples into a cleaved single mode fiber with only -2.8 dB loss, and has a -3 dB excess loss misalignment tolerance of /spl plusmn/3.4 /spl mu/m in the lateral and /spl plusmn/1.6 /spl mu/m in the transverse directions. The laser showed a T/sub 0/ of 112 K, indicating that the leakage of carriers is not very significant.

关键词： Optical coupling Gallium arsenide Fiber lasers Laser modes Laser theory Laser beams Semiconductor lasers Waveguide lasers Educational institutions Molecular beam epitaxial growth

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PARALLEL AND DISTRIBUTED TLM COMPUTATION WITH SIGNAL-PROCESSING FOR ELECTROMAGNETIC-FIELD MODELING

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INTERNATIONAL JOURNAL OF NUMERICAL MODELLING-ELECTRONIC NETWORKS DEVICES AND FIELDS 1995年第3-4期8卷 169-185页

作者： SO, PPM ESWARAPPA, C HOEFER, WJR NSERC/MPR Teltech Research Chair in RF Engineering Department of Electrical and Computer Engineering University of Victoria Victoria British Columbia V8W 3P6 Canada Poman So received his B.Sc. degree in computer science and physics from the University of Toronto Toronto Onatario Canada in 1985. He obtained his B.A. Sc. and M.A.Sc. degrees in electrical engineering (summa cum laude) from the University of Ottawa Ottawa Ontario Canada in 1987 and 1989 respectively. Mr So was a research engineer in the University of Ottawa from January 1989 to October 1991 his research interests included CAD techniques of microwave circuits and numerical methods for electromagnetic wave modelling. He specialized in the development of electromagnetic engineering CAD software and successfully implemented a number of electromagnetic wave simulators based on the two-dimensional and three-dimensional transmission-line matrix methods. From August 1990 to February 1991 he accompanied Professor W. J. R. Hoefer to Rome Italy and Sophia Antiopolas France. During that time he implemented a parallel version of the 3D-TLM simulator for the CM-2 Connection Machine using C-Star and X Windows Library. He is a research engineer and a Ph.D. student at the University of Victoria Victoria British Columbia Canada. He ported the 2D- and 3D-TLM simulators to DECmpp 1200 massively parallel computer using MPL C and C++. He also combined OSA90/hope a commercially available microwave CAD program with a 2D-TLM simulation module for geometry optimization using the Datapipe technique of OSA90/hope. Recently he has developed a distributed client-server computing technique for the TLM method this technique could accelerate the TLM simulation by more than an order of magnitude. Channabasappa Eswarappa received the M.Tech. degree in electrical engineering from the Indian Institute of Technology Kanpur India in 1983 and Ph. D. degree from the University of Ottawa Canada in 1990. He worked as an Assistant Executive Engineer and later as

This paper describes the implementation of transmission-line matrix (TLM) method algorithms on a massively parallel computer (DECmpp 12000), the technique of distributed computing in the UNIX environment, and the combination of TLM analysis with Prony's method as well as with autoregressive moving average (ARMA) digital signal processing for electromagnetic field modelling. By combining these advanced computation techniques, typical electromagnetic field modelling of microwave structures by TLM analysis can be accelerated by a few orders of magnitude.

关键词： Mathematical models

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Pearl Harbor Naval Base's donut-free bilge and oily wastewater disposal program

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NAVAL ENGINEERS JOURNAL 1995年第6期107卷 65-77页

作者： Gensure, JR Lieutenant John R. Gensure USN:is an Engineering Dufy Officer attached to Pearl Harbor Naval Shipyard and is currently serving as the Business and Strategic Planning Office's Submarine Business Operations Division Officer. Since 1992 he has played a major role in the development of the shipyaRD's bilge and oily wastewater disposal program. Previously he served aboard the USS Benjamin Franklin (SSBN 640) where he qualified for his Submarine Gold Dolphins and received two Navy Achievement Medals and the Battle Efficiency “E.” Lt. Gensure graduated with a Bachelor of Science degree in Physics from the U.S. Naval Academy in 1986 and a Master of Science degree in Electrical Engineering from the Naval Postgraduate School in 1992. He is a member of Sigma Pi Sigma and Eta Kappa Nu hmoraries a member of the U.S. Naval Institute and a life member of the American Sociefy of Naval Engineers (ASNE).

In April 1991, the Chief of Naval Operations directed all Naval activities to eliminate the use of Oil Disposal Rafts (donuts) as soon as possible for the disposal of bilge and oily wastewater. Pearl Harbor Naval Shipyard removed its donuts from service in 1991, and as of 1 October 1994, all donuts have been removed from service throughout the Pearl Harbor Naval Complex. Bilge and oily wastewater are composed of approximately 96 percent water, 3 percent oil, and 1 percent sludge. Oils and metals in suspension prevent bilge and oily wastewater from being processed via conventional indus trial wastewater or used oil treatment facilities. In December 1992, Pearl Harbor Oily Waste/Waste Oil (OWWO) Task Force initiated a Bilge and Oily Wastewater Management Plan based on the utilization of Bilge and Oily Wastewater Treatment Trains for the treatment of bilge and oily wastewater. The Treatment Trains processes influent wastewater, producing solidified sludge, used oil, and treated effluent wastewater that meets federal and state discharge limits for sewage disposal. During the period December 1992 to July 1995, Pearl Harbor Naval Base's Treatment Trains successfully processed over 11.6 million gallons of bilge and oily wastewater realizing an estimated cost savings of between $2.0 and $5.0 million over contracting out for the same service.

关键词： Wastewater disposal

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Abstract

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Pflügers Archiv 1996年第6期431卷 R322-R356页

作者： L. J. Andries S. U. Sys A. L. Meulemans J. A. J. Schuurkes B. Vanheel J. Van de Voorde P. De Smet J. Li W. Van Driessche B. Flamion S. Foulon M. Abramow P. Calders W. Eechaute E. Lacroix I. Weyne D. Hoeben C. Burvenich P. Fransen D. Van Bedaf M. Demolder R. Ouedraogo P. Lebrun A. Herchuelz M. -H. Antoine S. Vandenput D. Votion N. Anciaux D. H. Duvivier T. Art P. Lekeux Y. Ghafir M. Geurts E. Hermans J. -M. Maloteaux B. Perrad B. Noel F. Lagache J. L. Bister R. Paquay G. Derycke M. A. Vandermeir S. de Brouwer C. -A. Porret N. Stergiopulos J. -J. Meister M. Verbeke N. Lameire N. M. De Clerck J. De Schuytter J. Tytgato G. Buyse J. Eggermont G. Droogmans B. Nilius P. Daenens S. Salomone O. Feron C. Dessy N. Morel T. Godfraind A. M. Aloisi P. Sacerdote L. Lodi G. Carli C. Carobi G. Garinei U. C. Miniaci P. Scotto M. Sabatino P. Sardo L. Iurato V. La Grutta M. A. Bagni G. Cecchi E. Cecchini F. Colomo P. Garzella R. Bottinelli S. D. H. Harridge M. Canepari C. Reggiani Saltin Reggiani D. Bambagioni G. Fanò G, Menchetti P. Danieli-Betto A. Esposito R. Betto A. Megighian M. Midrio D. Danieli Betto C. Orizio D. Liberati C. Locatelli D. De Grandis A. Veicsteinas D. Angoli D. Delia E. Wanke M. Bramucci A. Miano L. Quassinti E. Maccari O. Murri D. Amici G. Cibelli S. Jüngling S. Schoch H. H. Gerdest G. Thiel I. Demori C. Bottazzi A. Voci E. Fugassa A. Barreca F. Minuto G. Gallo S. Fulle S. Belia G. Menchetti M. Cacchio G. Gastaldi U. Laforenza G. Ferrari G. Rindi M. G. Doni E. Padoin O. Residori M. Cesaro L. Toma A. Rubini F Mutinelli L. Paulesu R. Romagnolie M. Cintorino P. Pippia M. A. Meloni L. Sciola A. Spano M. Cogoli-Greuter A. Cogoli A. Sardini G. M. Mintenig M. A. Valverde F. V. Sepùlveda D. R. Gill S. C. Hyde C. F. Higgins P. A. McNaughton A. Spena M. T. Arcuri S. Bonofiglio R. Chimenti C. Covello T. De Cicco S. Mazzulla G. Martino A. Tottene A. Moretti D. Pietrobon M. C. Baccari F. Calamai G. Staderini E. Cova R. Marelli P. Sommi U. Ventura A. M. Lombardi R. Fabris C. Pagano G. Federspil R. Vettor R. Mancinelli P. To Laboratory of Physiology RUCA University of Antwerp Belgium Dept. of Gastroint. Pharmacol. Janssen Research Foundation Beerse Belgium Department of Physiology and Physipathology University of Gent De Pintelaan 185 Gent Belgium Laboratory of Physiology K. U. Leuven Leuven Belgium Laboratory of Pathophysiology University of Bruxelles (ULB) Brussels Belgium Laboratory of Normal and Pathological Physiology University of Gent Belgium Department of Physiology Biochemistry and Biometrics Faculty of Veterinary Medicine University of Ghent Merelbeke Belgium Laboratory of Physiology University of Antwerp (RUCA) Antwerp Belgium Lab. de Pharmacodynamie et de Thérapeutique Université Libre de Bruxelles Bruxelles Belgique Laboratory for Functional Investigation Faculty of Veterinary Medicine University of Liége Liège Belgium Laboratory for Functional Investigation Faculty of Veterinary Medicine University of Liège Liège Belgium Laboratory of Pharmacology Catholic University of Louvain Brussels Laboratoire de Physiologie Animale FUNDP Namur Laboratory of animal Physiology Facultés universitaires Notre-Dame de la Paix Namur Belgium Biomedical Engineering Laboratory Swiss Federal Institute of Technology Lausanne Switzerland RUCA University of Antwerp Antwerp Belgium Laboratory of Physiology Laboratory of Toxicology University of Leuven Leuven Belgium Laboratoire de Pharmacologie Université Catholique de Louvain Bruxelles Belgium Istituto di Fisiologia Umana Università degli Studi Siena Dipartimento di Farmacologia Università degli Studi di Milano Milano Istituto di Fisiologia Umana Università di Perugia Perugia Dipartimento di Medicina Sperimentale Università di Reggio Calabria Laboratorio di Fisiologia Umana Catanzaro Istituto di Fisiologia umana Palermo Dipartimento di Scienze Fisiologiche Università di Firenze Firenze Dipartimento Biologia Cellulare e Molecolare (sez. Fisiologia e Biofisica) Università di Perugia Perugia Istituto di Fisiologia Umana Univer

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Angled-facet high-power diffraction-limited tapered semiconductor amplifier

Angled-facet high-power diffraction-limited tapered semicond...

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IEEE Photonics Conference (IPC)

作者： P.S. Yeh C.C. Lu S. Merritt P. Heim S.H. Cho C. Dauga S. Fox C.E.C. Wood M. Dagenais Department of Electrical Engineering and Joint Program for Advanced Electronics Materials University of Maryland College Park MD USA Laboratory of Physical Science MD USA

Summary form only given. Tapered semiconductor amplifiers have successfully demonstrated high-power diffraction-limited emission. So far, all these amplifiers had normal incidence facets coated with antireflection (AR) coating to prevent self-oscillation. In this work, an angled-facet high-power diffraction-limited tapered GaAs-AlGaAs QW semiconductor amplifier operating at 809-nm was realized. Due to the angled facet structure, any residual reflection from the facets is fed back at a small angle with the signal propagation direction.

关键词： Diffraction Semiconductor optical amplifiers High power amplifiers Pulse amplifiers Power amplifiers Optical amplifiers Power generation Educational institutions Coatings Optical propagation

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New project to support scientific collaboration electronically

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Eos, Transactions American Geophysical Union 1994年第26期75卷 289-298页

作者： Clauer, C.R. Rasmussen, C.E. Niciejewski, R.J. Killeen, T.L. Kelly, J.D. Zambre, Y. Rosenberg, T.J. Stauning, P. Friis‐Christensen, E. Mende, S.B. Weymouth, T.E. Prakash, A. McDaniel, S.E. Olson, G.M. Finholt, T.A. Atkins, D.E. University of Michigan Space Physics Research Laboratory Ann Arbor Michigan 48109 United States SRI International Geoscience and Engineering Center Menlo Park California 94025 333 Ravenswood Ave United States University of Maryland Institute for Physical Science and Technology College Park Maryland 20742 United States Danish Meteorological Institute Solar Terrestrial Physics Division Copenhagen Denmark Lockheed Palo Alto Research Laboratory Palo Alto California 94304 3251 Hanover St United States University of Michigan Dep. of Electrical Engineering and Computer Science Ann Arbor Michigan 48109 United States University of Michigan Cognitive Science and Machine Intelligence Laboratory Ann Arbor Michigan 48109 701 Tappan United States University of Michigan School of Information and Library Studies Ann Arbor Michigan 48109 304 W. Engineering United States

A new multidisciplinary effort is linking research in the upper atmospheric and space, computer, and behavioral sciences to develop a prototype electronic environment for conducting team science worldwide. A real‐world electronic collaboration testbed has been established to support scientific work centered around the experimental operations being conducted with instruments from the Sondrestrom Upper Atmospheric Research Facility in Kangerlussuaq, Greenland. Such group computing environments will become an important component of the National Information Infrastructure initiative, which is envisioned as the high‐performance communications infrastructure to support national scientific research. ©1994. American Geophysical Union. All Rights Reserved.

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ACQUISITION REFORM AND BEST PRODUCT PROCUREMENT - AN engineering VIEW

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NAVAL ENGINEERS JOURNAL 1994年第6期106卷 41-57页

作者： FISHER, DA SKOLNICK, A He has been involved with several weapon system developments. Among these were the Trident II fire control and navigation systems the BSY-I Anti-Submarine Warfare System and the Navy standard computers (UYK44 and EMSP). He served as manager of the Digital Circuits Engineering Branch and was then appointed as manager of the Automatic Test Equipment (ATE) Technology Division. As manager of the ATE Technology Division he was responsible for the SP-23 Fire Control System Support Project the SP-24 Navigation Project and the Fleet Progressive Maintenance Program (2M/ATE). This Division was responsible for selection and application of electronic product technology and for developing fleet test and repair techniques. He holds a B.S. in Electrical Engineering from the University of Evansville and is currently pursuing a Masters of Public Administration at Indiana University-Purdue University Indianapolis. Dr. Alfred Skolnick:retired from the Navy in 1983 with the rank of captain. He is president of System Science Consultants (SSC) specializing in strategic planning technical program definition technology assessment and engineering analyses on selected matters of national interest. Dr. Skolnick taught mathematics and management sciences at University of Virginia and Marymount University. He is adjunct faculty at Northern Virginia Community College. From 1985 to 1989 he was president of the American Society of Naval Engineers. In the Navy he served at Applied Physics Laboratory/The Johns Hopkins University then aboard USSBoston(CAG-1) and played leading roles in several weapon system developments inertial navigation (Polaris) deep submergence (DSRV) and advanced ship designs (SES). He later was director Combat System Integration Naval Sea Systems Command and head Combat Projects Naval Ship Engineering Center. In 1975 he became a major project manager and led the Navy's High Energy Lasers Program in 1981 he was assigned all Navy Directed Energy Weapons development efforts. He was vice president advanced tech

The military services are being moved in the direction of performance-based specifications and standards. They are being steered against dictating ''how to'' produce an item since such action forecloses on the ability to gain access to components or technology that may have a commercial equivalent. Why should the engineering community embrace the new approach? Aside from the obvious weight of it being approved policy, therefore currently mandated, it warrants examination because it is the correct approach at this time when applied to appropriate products. Military specifications and standards are to be displaced then, by acceptable alternative contractor design solutions. Industry bidders will be allowed to propose the particular design details, permitting procurement flexibility by contractually citing only system level or interface requirements, both physical and functional. Hopefully, this can broaden the industrial base and increase competition with reduced costs to follow. Conceptually, the approach appears both performance-sensible and cost-attractive (there are, of course, consequent risks) but how does implementation proceed? Is it possible to pursue the goals envisioned along paths that are not in themselves experimental? Can the American postulate, minimal loss of life and limb to U.S. military people, continue to be honored? Experience and track record elsewhere imply encouraging possibilities in select situations-useful prospects are identified and discussed in practical terms.

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THE CALLING(SM) NETWORK - A GLOBAL WIRELESS COMMUNICATION-SYSTEM

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第1期12卷 45-61页

作者： TUCK, EF PATTERSON, DP STUART, JR LAWRENCE, MH Calling Communications Corporation. 1900 West Garvey Ave South. Suite 200 West Covina CA 91790 USA. Chairman of Calling Communications Corporation. He is also the Managing Director of Kinship Venture Management Inc. the general partner of Kinship Partners 11 and a General Partner of Boundary the general partner of The Boundary Fund. As a venture capitalist he has founded or participated in founding several telecommunications companies including Calling Communications Corporation Magellan Systems Corporation manufactures of Global Positioning System receivers Applied Digital Access manufacturer of DS-3 test access and network performance monitoring equipment Endgate Technology Corporation specialists in satellite phased array antennas and Poynting Systems Corporation. now a division of Reliance Corporation manufacturers of fibre optic transport equipment. He was a founder of Kebby Microwave Corporation where he invented the first solid-state. frequency-modulated commercial microwave link system. The company was acquired by ITT Corporation where he rose to the position of V.P. and Technical Director of ITT North America Telecommunications Inc. Subsequently he was V.P. of Marketing and Engineering at American Telecommunications Inc. (ATC). He was founding Director of American Telecom Inc. a joint venture between ATC and Fujitsu and has served on more than 20 boards of directors including those of three public companies. He has authored articles on microwave engineering and telephone signalling and was a contributor to Reference Data For Radio Engineers. He is a graduate of the University of Missouri at Rolla where he was later awarded an honorary Professional degree and serves on its Academy of Electrical Engineering. Mr Tuck is a Senior Member of the IEEE a Fellow of the Institution of Engineers (Australia) a Professional Member of the AIAA and a registered professional engineer in three states. More than 25 years of experience in the telecommunications industry where he has been responsibl

There is a very large demand for basic telephone service in developing nations, and remote parts of industrialized nations, which cannot be met by conventional wireline and cellular systems. This is the world's largest unserved market. We describe a system which uses recent advances in active phased arrays, fast-packet switching technology, adaptive routeing, and light spacecraft technology, in part based on the work of the Jet Propulsion Laboratory and on recently-declassified work done on the Strategic Defense Initiative, to make it possible to address this market with a global telephone network based on a large low-Earth-orbit constellation of identical satellites. A telephone utility can use such a network to provide the same modern basic and enhanced telephone services offered by telephone utilities in the urban centres of fully-industrialized nations. Economies of scale permit capital and operating costs per subscriber low enough to provide a service to all subscribers, regardless of location, at prices comparable to the same services in urban areas of industrialized nations, while generating operating profits great enough to attract the capital needed for its construction. The bandwidth needed to support the capacity needed to gain these economies of scale requires that the system use K(alpha)-band frequencies. This choice of frequencies places unusual constraints on the network design, and in particular forces the use of a large number of satellites. Global demand for basic and enhanced telephone service is great enough to support at least three networks of the size described herein. The volume of advanced components, and services such as launch services, required to construct and replace these networks is sufficient to propel certain industries to market leadership positions in the early 21st Century.

关键词： LOW EARTH ORBIT SATELLITE COMMUNICATIONS FAST PACKET SWITCHING EARTH FIXED CELLS ADAPTIVE ROUTEING LIGHT SPACECRAFT K(A) BAND PHASED-ARRAY ANTENNAS

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Effects of aging on polyimide: a model for dielectric behavior (of relative humidity sensors)

Effects of aging on polyimide: a model for dielectric behavi...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： A.R.K. Ralston M.C. Buncick D.D. Denton T.E. Boltshauser J.M. Funk H.P. Baltes Department of Electrical and Computer Engineering and Materials Science Program University of Wisconsin Madison Madison WI USA Physical Electronics Laboratory Swiss Federal Institute of Technology Zurich Switzerland

Quantifying the effect of moisture on the electrical properties of thin dielectric films requires the use of a model that takes into account the geometry of the test structure and the dielectric properties of the air layer above the device. Using this approach, it was found that the electrical properties of dry PI (polyimide) do not change substantially after six weeks of aging at 85 degrees C/85% RH (relative humidity). The dielectric permittivity of PI as a function of %RH increased with aging for excitation frequencies between 12 Hz and 100 kHz. This increase is correlated with observed changes in the surface chemistry of the aged PI film. Shifts in ESCA peak intensities indicate oxidation of the PI surface and deimidization with aging. Possible mechanisms for the observed changes in dielectric properties with aging include a change in the morphology of the bulk PI, resulting in a decreased surface to volume ratio, increased water absorption, a change in the interaction of absorbed water with the PI matrix, and dielectric interfacial effects.< >

关键词： Aging Polyimides Surface morphology Water Moisture Dielectric films Solid modeling Geometry Testing Dielectric devices

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FULL-WAVE SOLUTION OF DIELECTRIC LOADED WAVE-GUIDES AND SHIELDED MICROSTRIPS UTILIZING FINITE-DIFFERENCE AND THE CONJUGATE-GRADIENT METHOD

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INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE COMPUTER-AIDED engineering 1991年第4期1卷 346-357页

作者： NARAYANAN, V MANELA, M LADE, RK SARKAR, TK Department of Electrical and Computer Engineering Syracuse University Syracuse New York 13244-1240 Viswanathan Narayanan was born in Bangalore India on December 14 1965. He received the BE degree in Electronics and Communications from B.M.S. College of Engineering Bangalore in 1988. He joined the Department of Electrical Engineering at Syracuse University for his graduate studies in 1989 where he is currently a research assistant. His research interests are in microwave measurements numerical electromagnetics and signal processing. Biographies and photos are not available for M. Manela and R. K. Lade. Tapan K. Sarkar (Sf69-M'76-SM'X1) was born in Calcutta. India on August 2 1948. He received the BTech degree from the Indian Institute of Technology Kharagpur India in 1969 the MScE degree from the University of New Brunswick Fredericton Canada in 1971. and the MS and PhD degrees from Syracuse University. Syracuse NY in 1975. From 1975-1976 he was with the TACO Division of the General Instruments Corporation. He was with the Rochester Institute of Technology (Rochester NY) from 1976-1985. He was a Research Fellow at the Gordon Mckay Laboratory Harvard University Cambridge MA from 1977 to 1978. He is now a Professor in the Department of Electrical and Computer Engineering Syracuse University. His current research interests deal with numerical solutions of operator equations arising in electromagnetics and signal processing with application to system design. He obtained one of the “ best solution” awards in May 1977 at the Rome Air Development Center (RADC) Spectral Estimation Workshop. He has authored or coauthored more than 154 journal articles and conference papers and has written chapters in eight books. Dr. Sarkar is a registered professional engineer in the state of New York. He received the Best Paper Award of the IEEE Transactions on Electromagnetic Compatibility in 1979. He was an Associate Editor for feature articles of the lEEE Antennas arid Propagation Sociefy Newsletter and was

Dynamic analysis of waveguide structures containing dielectric and metal strips is presented. The analysis utilizes a finite difference frequency domain procedure to reduce the problem to a symmetric matrix eigenvalue problem. Since the matrix is also sparse, the eigenvalue problem can be solved quickly and efficiently using the conjugate gradient method resulting in considerable savings in computer storage and time. Comparison is made with the analytical solution for the loaded dielectric waveguide case. For the microstrip case, we get both waveguide modes and quasi-TEM modes. The quasi-TEM modes in the limit of zero frequency are checked with the static analysis which also uses finite difference. Some of the quasi-TEM modes are spurious. This article describes their origin and discusses how to eliminate them. Numerical results are presented to illustrate the principles.

关键词： Waveguides

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