BROADBAND LINEAR SSB-UPCONVERTER WITH ELECTRONICALLY-CONTROLLED LO-SUPPRESSION FOR 16 QAM APPLICATIONS AT 4 GHz W. Schiller* ABSTRACT A simple method to improve the local oscillator suppression of mixer circuits in a broadband manner will be presented. The dependencies of temperature, power and voltage changes will be shown. Finally the construction and performance of a 4-GHz SSB-upconverter using

NOISE FIGURE AND ASSOCIATED CONVERSION GAIN OF A MICROWAVE MESFET GATE MIXER G.K. Tie* and C.S. Aitchison* ABSTRACT The noise figure of a microwave MESFET mixer has been calculated for the first time. This paper presents the theoretical and experimental results of the noise figure and conversion gain of a microwave MESFET mixer. The effects of the RF circuit at the mixer's output side and

OPTIMUM DESIGN OF SINGLE SIDEBAND FIN-LINE MIXERS WITH FILTERS Dr. T. Berceli, V. Geleji, Mrs. T. Kolumban ABSTRACT In the paper optimun design of SSB fin-line mixers is dealt with. The effects of mixer, filter and coupling parts are investigated in detail with respect to overall performance. The optimum design procedure proved to be very effective according to the experiments made on the develop

A DOUBLE BROAD BALANCED 'IILINE ftIXER WITH IF BANDWIDTH CAPABILITY R. Knoechel ABSTRACT: A novel double balanced mixer (DBft) design is reported, which is suitable to cover very broad IF-bandwidths, and overcomes the problem of IF-bandwidth restriction, co.mon to many other DBft's. The mixer utilizes bilateral finline at the RF-input and a tapered balun at the IF-output. The circuit can be

CHARACTERISTICS OF MilliMETER-WAVE INTERFACE SCHOTTKY DIODES WITH MICROClUSTER E. ~ ~ ~~ ~~ ~~~ Kollberg~, H. Zirath", M.V. Schneider"", A.Y. Chon", A. Jelenski""" ABSTRACT We present experimental evidence that a single Schottky diode on GaAs is an agglomerate of paralleled microjunctions with different barrier heights and saturation currents. The current-voltage characteristic of the

THE DEPENDENCE OF THE STATISTICS SCATTERER PROPERTIES IN MICROWAVE OF THE DETECTED INTENSITY ON THE IMAGING C. J. Ol~ver . * ABSTRACT A model is proposed for surface scattering of electromagnetic waves which combines the effects of scatterer bunching and Poisson number fluctuations due to a restricted number of scatterers lying within the illuminated region. The fluctuating scatterer density

MICROWAVE IMAGING USING AN IMPULSE SIGNAL F.N. KONG * and S. EVANS * ABSTRACT It is shown how the EM field over an object plane can be synthesised from a time domain record of the far-field radiation off the axis of symmetry. Two off-axis observations are sufficient to synthesise a two-dimensional distribution and the spatial resolution attainable (independent of distance) depends on the ti

A MULTI STATIC AT 35 GHz TWO-DIMENSIONAL MILLIMETER WAVE IMAGING SYSTEM M. Bockmair * , J. Detlefsen * ABSTRACT First experimental results for a short range millimeterwave imaging system are reported, which uses four homodyne receivers positioned along a linear aperture in order to get azimuthal resolution. The radial distance is additionally evaluated by switching between two frequencies i

REALTIME 70 GHZ-IMAGING SYSTEM FOR CLOSE RANGE APPLICATIONS + * H. Brand, E. Kreutzer, M. Vogel + ABSTRACT The design principles for real time microwave imaging systems with multiple-target capability in close range applications are discussed. Target movements in usual traffic situations should be recognized even in severe weather conditions. An experimental approach to the problem leads to a

A MICROWAVE DIFFRACTION TOMOGRAPHY SYSTEM FOR BIOMEDICAL APPLICATIONS G. PERONNET , Ch. PICHOT , J.Ch. BOLOMEY C. SZELES**, Y. MICHEL** J.L. GUERQUIN-KERN***, M. GAUTHERIE*** * * *, L. JOFRE * , A. IZADNEGAHDAR * ABSTRACT This paper describes a 3 GHz experimental set-up for quasi real time tomography of biological media. Experiments on animal organs illustrate the main features of t