X-BAND GaAs MESFET OSCILLATORS FOR MIC PURPOSES R. Stahlmann + ABSTRACT GaAs MESFETs with 200 µm gate width were examined for MIC oscillator purposes without using external high Q-resonators. Using the small different was tested ration. signal the equivalent small circuit The common with field gate 15 elements were effect valid for opeup to the x-band signal parameters derived oscillato

MICROWAVE FIELD OBJEC TS . INFLUENCE ON SOME CHEMICAL AND BIOLOGICAL A.I. Tereshchenko ABSTRACT The investigation of the microwave field influence on substance has reached such a level when it is possible to make an attempt of the definite generalisation of some questions on the basis of particular results.Among these questions are the defrostation of biological objects and the technological

GALERKIN -METHOD CALCULATION OF THE PROPAGATION WAVEGUIDE CONSTANT IN A GYROELECTRIC INHOMOGENEOUS E. PIC and H. LUONG * ABSTRACT A Galerkin-method calculation is presented for propagation study in a semiconductor loaded waveguide with transverse magnetization. The surface impedance tensor of the semiconducting plate is first evaluated from transmission-line theory. The boundary conditi

FERRITE AND SEMI CONDUCTOR RECIPROCAL PHASE SHIFTERS IN MILLIMETER RANGE X B. CHAN SONG LINT, A. PRIOU ,(I.E.E.E. member) ABSTRACT : in 4 millimeter figure of 35 degrees/dB results are New reciprocal ferrite and semi-conductor phase shifters wavelengths are described. The experimental works indicate a merit of about 90 degrees/dB for the ferrite device and about for the semiconductor dev

GYROTROPIC SUSCEPTIBILITY OF POLYCRYSTALLINE REMANENT STATE. FERRITES MAGNETIZED AT L. Courtois, J. Fernandez *. r.f. in and Abstract: Taking into account the internal dipolar effect, the susceptibility tensor is calculated for polycrystalline ferrite three magnetization states: at saturation, at remanent state, unmagnetized. The use of ferrites and garnets is limited in VHF range by the low

ANALYTICAL STUDY OF HELICAL LATCHING FERRITE FRASER STRUCTURE K.F. Ivanov +) ABSTRACT The propagation of circularly symmetrical mode in an infinitely long thin-wire helix, wound on a latching ferritecylinder, magnetised azimuthally to remanence and surrounded by homogeneous, isotropic, lossless dielectric and perfectly conducting metallic shield is studied analytically. The characteristic equa

IMPROVED MICROSTRIP CIRCULATOR DESIGN BY MODIFIED RESONANCE COMPUTATIONS Norbert Krause ABSTRACT Microstrip substrates circular disc resonators with pure dielectric interest in the field or gyrotropic of MIC's. To evalu- are of some practical ate the resonance frequencies especially of those, realized on ferrimagnetic materials, a new approach was made, giving better accuracy than the commonl

MAGNETOSTATIC SURFACE WAVE GROUP DELAY EQUALIZER L. COURTOIS + - J.R. MAHIEU ++ ABSTRACT In telecommunication systems (by hertzian wave or circular waveguide) the transmitted signals are liable to important modifications due particularly to the variation of the group delay introduced by the transmission support and the equipments. It is therefore necessary conditions, to use group in ord

OPTIMIZATION OF NON-RECIPROCAL CENTIMETER-WAVELENGTH DEVICES USING n-TYPE GERMANIUM SLABS. . F. GAUTlITER - M. BESSE - Y. GARAULT ABSTRACT The propagation constant of rectangular waveguides partially loaded with different n-germanium slabs placed on various isotropic substrates and subjected to a magnetic induction B parallel to the dielectric-semiconductor interface are computed by Schglk

A NEW ELLIPTICALLY SHAPED BEAM ANTENNA (**) (*) Salvatore DE PADOVA, Enrico PAGANA, Giorgio ROSENGA ABSTRACT A new reflector antenna having a shaped main beam with elliptical cross section is introduced. Antennas with shaped main beams are required on board the satellite in order to save power and avoid interferences. The shape of the main beam must be such as to cover the earth zone to be ser