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2-11 GHz Dual Polarization Antenna for Terrestrial Radio Links

2-11 GHz Dual Polarization Antenna for Terrestrial Radio Lin...

引用

European conference on Microwave

作者： D. Savini P. Bielli CSELT Torino Italy CSELT - Centro Studi e Laboratori Telecomunicazioni S.p.A. Via G. Reiss Romoli 274 - 10148 TORINO (ITALY)

the paper presents the design criteria and the electrical characteristics of a terrestrial radio link antenna operating simultaneously, with dual linear polarization, at 2 and 11 GHz frequency bands. the antenna consists of a 4m parabolic reflector with a double grid shaped dichroic subreflector which is the most innovative component, theoretically designed and optimized by means of a reliable electromagnetic model. the performance are comparable with the typical values of radio link antennas operating at single band. Both electrical and cost requirements have been considered in the choice of the candidate configuration.

关键词： Radio link Electric variables Electromagnetic wave polarization Frequency Reflector antennas Antenna accessories Antenna theory Design optimization Reliability theory Electromagnetic modeling

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the Analysis of Resonance Phenomenon in Dielectric Bodies using the Discrete Source Method

The Analysis of Resonance Phenomenon in Dielectric Bodies us...

引用

European conference on Microwave

作者： Ju. A. Eremin A.G. Sveshnikov USSR Academy of Science Moscow Russia

We consider the problem of developing an efficient numerical technics for solving the problem of resonance phenomenon in electromagnetic wave scattering by dielectric bodies. the discrete source method is used, and its main points are formulated. A resonance absorbtion of electromagnetic energy by biological scatterers is investigated. Some new phenomenon are discovered. Also the problem of identification of a dielectric scatterer immersed in dissipative half-space is considered.

关键词： Resonance Dielectrics Electromagnetic scattering Mathematical model Boundary value problems Electromagnetic radiation Biological system modeling Electromagnetic propagation Dosimetry Electromagnetic analysis

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On Wafer Automatic three Ports Measurement system for MMIC Circuits and Dual Gate FETs

On Wafer Automatic Three Ports Measurement System for MMIC C...

引用

European conference on Microwave

作者： N. Boulanger C. Rumelhard B. Carnez L. Boulanger C. Sentubery Thomson Composants Microondes Orsay France

Recent advances in monolithic design point out the need for accurate and repeatible "S" parameters measurements of three ports RF circuits such as dual gate FETs. this paper presents an automatic on wafer three ports system for frequencies up to 26.5 GHz consisting of a two ports Network Analyser and wafer probes, that is used to provide RF measurements of three ports devices and to extract the model of dual gate FETs. On wafer calibration method including the open short load and transmission technique with on GaAs standards is used, probe techniques for making the best possible on wafer measurements and a range of measurement applications are examined.

关键词： MMICs Circuits FETs Radio frequency Probes Scattering parameters Frequency measurement Semiconductor device modeling Calibration Gallium arsenide

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Temperature non-uniformities in a silicon test square during rapid thermal processing

Temperature non-uniformities in a silicon test square during...

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European conference on Solid-State Device Research (ESSDERC)

作者： A G O'Neill D Boys S K Jones C Hill Department of Electrical and Electronic Engineering University of Newcastle UK Plessey Research Caswell Limited Towcester Northamptonshire UK

Rapid thermal processing of a small process square placed on a susceptor wafer of controlled emissivity is investigated. Under these conditions the process square is hotter than the susceptor wafer. Finite element modelling is compared with experimental data and used to predict the subsequently observed changes in process square temperature as its size and the condition of the susceptor wafer are changed.

关键词： Silicon Rapid thermal processing system testing Temperature distribution thermal conductivity Partial differential equations Finite element methods Semiconductor device modeling Temperature control Temperature measurement

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Temperature behaviour of CMOS devices built on SIMOX substrates

Temperature behaviour of CMOS devices built on SIMOX substra...

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European conference on Solid-State Device Research (ESSDERC)

作者： J Belz G Burbach H Vogt W Zimmenmarnn Fraunhofer Institute of Microelectronic Circuits and Systems Finkenstr. 61 D-4100 Duisburg FRG Fraunhofer Institute of Microelectronic Circuits and System Duisburg Germany

CMOS devices have been built on SIMOX substrates. the device characteristics are examined in the temperature range from room remprature up to 300°C. the degradation of the threshold voltage and the carrier mobility are comparable for bulk-and SOI-devices, but at 300° C the off-state currents of the SOI-devices aCre three orders of magnitude less than those of the bulk counterparts. the capability of SOI-devices for high temperature applications will be shown.

关键词： Temperature distribution Silicon threshold voltage Insulation Semiconductor films Doping Semiconductor process modeling Predictive models Capacitance Microelectronics

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10GHz Band Compact Phase Locked Oscillator with Low Phase Noise

10GHz Band Compact Phase Locked Oscillator with Low Phase No...

引用

European conference on Microwave

作者： Tomozo Ohta Masao Miyazaki Kaoru Okabe Atsushi Ashida Sharp Corporation Telecommunication Research and Development Center Tenri Nara Japan Sharp Corporation Telecommunication Research and Development Center (2613-1 Ichinomoto-cho Tenri-shi NARA 632 JAPAN)

the small-sized and light-weighted 10GHz band Phase Locked Oscillator(PLO) with superior characteristics, cost effectiveness and high productivity have been newly developed for satellite communication systems such as VSAT. the PLO is composed of three circuit modules, the small-sized 2.7GHz band VCO module, the x4 frequency multiple module and the PLL/Power suplly module. the output phase noise characteristics is evaluted in theoretically by simple noise model considering the phase noises generated in the divider, the phase-detector, the VCO and others. the measured phase noise of PLO is in good agreement with the calculated. the characteristics of the PLO are -75dBc/Hz at 100Hz, -84dBc/Hz at 10KHz in the phase noise and less than ±2ppm(-40~+60°C) in the frequency stability. the volume is about 110cc and the weight is 185g.

关键词： Phase noise Voltage-controlled oscillators Frequency Costs Productivity Satellite communication Phase locked loops Circuit noise Noise generators Power system modeling

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An Assessment of thermoelectric Conversion for the Erato 20 kWe Space Power system

An Assessment of Thermoelectric Conversion for the Erato 20 ...

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Intersociety conference on Energy Conversion Engineering (IECEC)

作者： J.-M. Tournier M.S. EI-Genk F.O. Carre Institute for Space Nuclear Power Studies Chemical and Nuclear Engineering Department University of New Mexico Albuquerque NM USA Centre dE28099Etudes Nucleaires de Saclay Commissariat a lE28099Energie Atomique Gif-sur-Yvette France

Mass optimization studies are performed within the framework of the French ERATO space nuclear power program to investigate the suitability of thermoelectric converters for an LMFBR-derivative system. Results indicated that a PbTe converter in conjunction with conventional LMFBR, having a core exit temperature <907 K and cooled by NaK (78%), offers a competitive option. the total mass of the ERATO-TE system for a beginning-of-life nominal power of 25 kWe is 2600 kg. this mass is comparable to that of the reference system with a closed Brayton converter. In addition to the inherent reliability of TE converters, the radiator area (~ 110 m/sup 2/) and total mass of the ERATO-TE system represents 73 percent of the maximum radiator area compatible with the ARIANE-V launcher, and about 50 percent of the launch capacity to high earth orbit, respectively.

关键词： thermoelectricity Power systems Tellurium Temperature Nonlinear equations Space technology Inductors Power system modeling Steady-state Semiconductor materials

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Optimized silicon low-voltage power MOSFET's for high-frequency power conversion

Optimized silicon low-voltage power MOSFET's for high-freque...

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Annual IEEE conference on Power Electronics Specialists (PESC)

作者： K. Shenai C.S. Korman J.P. Walden A.J. Yerman B.J. Baliga General Electric Corporate Research and Development Center Schenectady NY USA Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

the specific results obtained from a systematic optimization of low-voltage silicon power MOSFET technologies are discussed. the areas discussed include system impact, unit cell optimization, device and process modeling, fabrication technology development, and measured results. the device technologies optimized include 30 V, 50 V, and 100 V vertical power DMOSFETs with refractory silicide gate and contact metallizations. Devices with the lowest specific on-resistance, the lowest specific input capacitance, and optimized switching performance have been fabricated with excellent wafer yield. these results represent the best high-frequency switching performance based on silicon material technology ever reported.< >

关键词： Silicon MOSFET circuits Power MOSFET Semiconductor device modeling Power system modeling Fabrication Area measurement Silicides Metallization Capacitance

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modeling and analysis of computer power systems

Modeling and analysis of computer power systems

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Annual IEEE conference on Power Electronics Specialists (PESC)

作者： H.N. Chandra V.J. thottuvelil Digital Equipment Corporation Maynard MA USA

Two techniques for time-domain analysis, cycle-by-cycle simulation of switched linear circuits and state-space averaging, are discussed in the context of modeling computer power systems. these techniques are compared by studying the output voltage response of a single DC-to-DC power converter to a transient load. Measured data are used to validate the simulated results. Simulation CPU times are also presented along with a discussion on the pros and cons of each approach. Predicting the response to line and load transients of a much larger system composed of three paralleled DC-to-DC converters is studied using state-space averaged models implemented in SPICE.< >

关键词： Power system modeling Power system analysis computing Power system simulation Power system transients Computational modeling Circuit simulation Power system measurements Context modeling DC-DC power converters Time domain analysis

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Computer-aided dynamic performance prediction of electronically switched loads-permanent magnet generator systems

Computer-aided dynamic performance prediction of electronica...

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Annual IEEE conference on Power Electronics Specialists (PESC)

作者： A.A. Arkadan N.A. Demerdash Marquette University Milwaukee WI USA Clarkson University Potsdam NY USA

A method for modeling permanent-magnet AC generator systems with electronically switched loads is presented. Continuous switching of the associated power electronics results in continuous change in the machine system topologies. the network modeling of such systems was done on an instantaneous basis in the time domain. In this approach, the effects of magnetic circuit nonlinearities and space harmonics due to stator slotting and rotor saliency were taken into account. this generalized method was used to predict the dynamic performance of a two-pole, 75 kVA, 208 V, 24000 rev/min permanent-magnet generator system, as well as to study the effects of electronic component failure and the effects of damping circuits on the system power.< >

关键词： Power system modeling AC generators Power electronics Network topology Circuit topology Magnetic circuits Stators Rotors Nonlinear dynamical systems Permanent magnet motors

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