40 WATT 16 GHz pumED GUNN DIODE OSCILLATOR Stevens, R., Tarrant, D., ~ers, F.A. ABSTRACT Very high peak power levels at microwave frequencies can be generated from several semiconductor devices (Gunn diodes, L.S.A. mode devices, TRAPATT's etc.) but some of these devices are only little removed from laboratory devices, and are limited in frequency. The Gunn device is the most practical and

GUNN AND IMPATT AMPLIFIERS FOR COMMUNICATIONS SYSTEMS H. C. Bowers ABSTRACT This paper discusses the use of negative resistance Gunn and IMPATT diodes in amplifier circuits. The operation of these diodes, their characteristics, design of circuits using them, and performance of these circuits is presented. The performance characteristics of these amplifiers pertinent to their use in frequency an



STABLE AMPLIFICATION AND HIGH CURRENT DROP GaAs Tills BISTABLE SWITCHING IN SUPERCRITICAL S.H. Izadpanah*, B. Jeppsson**, P. Jeppesen*** and P. Js6ndrup*** ABSTRACT Bistable switching with current drops of 40% and switching ps are obtained in pulsed operation of 10µm supercritically GaAs Transferred Electron Devices (TEDs). When CW-operated vices exhibit a 5-17 GHz bandwidth for the stable

GEOMETRIC MAGNE10RESISTANCE (GMR) AS A 1'OOL fOR CHARACTERIZING InP TRANSFERRED ELECTRON DEVICES. W. J. bevlin, :M. J. Howes and D. V. 'Morgan. used to evaluate contact properties devices. Devices made on the same dot, Ag/Sn and Ag, have respectbarrier behaviour in their I-V as a function of bias, µ(V). a low height barrier, series with the barrier has been fitted device and the results used to th

NOISE MEASURE OF GaAs AND InP TRANSFERRED ELECTRON AMPLIFIERS J.E. Sitch. P.N. Robson ABSTRACT The noise measures of both GaAs and InP transferred electron amplifiers are initially calculated analytically for the case of uniform electric field and free carrier concentration and are shown to have minimum values for nol products of about l0^llcm-2. Noise measures for devices having realist

DESIGN ELECTRON AND.PERFORMANCE OSCILLATORS OF INDIUM PHOSPHIDE MILLIMETRE WAVE TRANSFERRED D.M. Brookbanks and P.M. White ABSTRACT Indium Phosphide TEO's giving up to 1/4 Watt C.W. power at 28.5 GHz with an efficiency of 3% have been prepared by an Integral Heat Sink technique. Efficiencies of 5.5% pulsed at 32.5 GHz and 2% C.W. at 50 GHz have also been observed. The device and circuit

MEASUREMENTS OF ATMOSPHERIC ATTENUATION PATH AT 230 GHz USING A SUN TRACKER G.T.Wrixon ON AN EARTH SPACE ABSTRACT Measurements of attenuation at 230 GHz through the total atmosphere due to the presence of oxygen and water vapour molecules, clouds and rain are presented and discussed. The measurements were carried out using a specially designed superhetrodyne receiver mounted on a sun tracker. S

A COMPLETE STUDY OF THE ACCURACY OF THE COMPUTED ATMOSPHERIC ATTENUATION BY RADIOMETRIC MEASUREMENTS VORST x Jacques VAN VYVE and Andre VANDER ABSTRACT For future communications, measurements are carried out to predict the effect of the earth's atmosphere on microwave propagation above 10 GHz. In the case of satellite links, radiometers are used for their reliability and low cost to monitor

DEPOLARIZATION MEASUREMENTS AT 12 GHZ P.W. SOBIESKI x ABSTRACT A 2 Km long horizontal link, at 12 GHz, is set up to provide measurements of depolarization. CW signal is sequentially (each 1msec) transmitted in vertical, horizontal and canted (45°) polarization. Synchroneous detection allows to determine co- and crosspolar fields, in amplitude and phase, in "cartesian" form. Fields are express