A FREQUENCY STABILIZED GUNN OSCILLATOR WITH A LEUCOSAPPHIRE DIELECTRIC RESONATOR P.R.Stankov,R.I.Kozhuharov,I.Hr.Stanchev + ABSTRACT -------General design considerations for second harmonic Gunn oscillators are discussed and an approach to the problem of achieving high short-term frequency stability and spectral purity is presented. The construction and performance of an K-band oscillator i

AN UNUSUAL MICROWAVE MIXER ,. G. Tomassetti" ABSTRACT Some preliminary measurements on an unusual microwave mixer configuration are reported. The mixer employied a single gate, packaged GaAs FET in a novel coaxial mount. The L.O. power and the I.F. were fed to and taken from the drain while the input R.F. signal was connected to the gate. A conversion gain of 2 dB and 270K DSB "mixer" noise t

A MICROWAVE FREQUENCY HALVER WITH CONVERSION GAIN S.P. Stapleton and M.G. Stubbs ABSTRACT A novel frequency halver circuit is presented, based on the concept of parametric division using a Schottky diode. This technique utilizes the gate to source Schottky diodes of two FETs in a half frequency, resonant loop configuration. Measurements of such a frequency divider, for an input signal i

NEW CONFIGURATIONS TO REDUCE CONVERTED FM NOISE IN FET OSCILLATORS N. MAMODALY*,M. PRIGENT**, J. OBREGON** ABSTRACT To fulfill the low near carrier lators, thods FM noise characteristic required by the future new different FET oscilme- new structures have to be looked to improve FM noise characteristics for. This paper presents three in microwave FET oscillators. - A push-push multiplie

A TUNABLE FET AMPLIFIER IN INTEGRATING WAVEGUIDE TECHNOLOGY U. Meier, ABSTRACT J.H. Hinken* A novel low loss guiding structure (INWATE) is applied design of GaAs FET waveguide amplifiers. Experimental of a single stage amplifier show a gain characteristic 6.7 +- 0.15 dB within a relative bandwidth of 2.4 % at frequency of 10.15 GHz with an associated minimum noise of 3.6 dB (MGF 1302 : M

SDA, A NEW SOLUTION FOR TRANSCEIVERS G. M. Ritter* ABSTRACT SDA stands as a synonym for "Switchable Direction Amplifier". For such an amplifier the direction of amplification is controlled by the polarity of the applied DC voltages. The same principle may be extended build active mixers of switchable direction (SDMs). Therefore it is possible to operate a complete receiver front-end, consisting

A NEW SYSTEM FOR MICROWAVE HOLOGRAPHIC SERVICES G. Junkin, IMAGING OF BURIED A.P. Anderson ABSTRACT A new method for improving resolution without increasing operating frequency is proposed. This bistatic version of the holographic technique involves illuminating the buried services from a source antenna placed on, or implanted slightly below the interface. Resolution is improved by scanning in

NON-INVASIVE BY MICROWAVE R. Aitmehdi, MEASUREMENT PHASE OF LOSS FACTOR IN DIELECTRIC BODIES TOMOGRAPHY and S. Sali A.P. Anderson ABSTRACT The feasibility of phase tomography as a non-invasive measurement of loss factor is presented. Limitations of first order Born approximation using accurate simulation models are examined. 

APPLICATIONS OF SATELLITE MICROWAVE RADIOMETRY IN FINLAND M. Hallikainen and P. Jolma ABSTRACT Data from the Scanning Multichannel Microwave Radiometer (SMMR) onboard Nimbus-7 satellite were applied to (a) retrieval of the water equivalent of snow cover, (b) discrimination of forest and surface types, and (c) determination of the near-surface wind speed. Several water equivalent retriev

EFFICIENT MODELLING GAAS CIRCUITS TECHNIQUE OF LOSSY MICROSTRIP LINE SECTIONS IN DIGITAL N. Moisan, J.M. ABSTRACT Floc'h, J. Citerne+ An engineering solution based on an "ad hoc" synthesis of the impulse response, the forward and the backward characteristic impedances at a given terminal node is presented. The governing principle of this synthesis is to ensure a continuous transition fr