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

POWER TRANSFER IN THE FRESNEL ZONE AT MM-WAVELENGTHS G.SCHAERER ABSTRACT The power transfer efficiency(ratio of received to trans - mitted power) between two elliptical antennas in the Fresnel zone is investigated experimentally. The design procedure for an optimum power transfer system is analyzed. Pyramidal horns in the foci of the ellipsoids enable an optimum phase illumination. Deviations

IMPORTANCE OF AMPLITUDE SCINTILLATIONS IN MILLIMETRIC RADIO LINKS E. Vilar and P.A. Matthews ' '""" . . \ Amplitude scintillations in millimetric/radio propagation are not usually considered by systems engineers I In this paper, the experimental measurements of these scintillations in a 36 GHz radio link have been fitted into a model suitable for the millimetric range. From it, the amplit

* ATMOSPHERIC EFFECTS ON TERRESTRIAL MILLIMETER-WAVE COMMUNICATIONS S. J. Dudzinsky, Jr. f millimeter-wave communications links that operate on paths through the atmosphere requires an understanding of atmospheric transmission losses, especially losses due to rainfall attenuation. This paper combines information on transmission properties of millimeter waves with meteorological data to derive a

THE DESIGN OF BARITT OSCILLATORS BASED ON LARGE-SIGNAL MEASUREMENTS. R. D. Pollard, ABSTRACT M. J. Howes and D. V. Morgan. The design of microwaveoscillators using solid-state, negativeresistance devices is considered from the point of view of the general criterion for a steady-state free-running oscillator circuit. The intersection of the circuit admittance locus with the large-signal "devi