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

A NEW METHOD OF THE Dr P.F. FOR SUPPRESSING APERTURE THE AXIAL DIVERGENCE ZONE OF G.T.D. IN THE STUDY CIRCULAR COMBES IN ITS RAYLEIGH's X ABSTRACT For a circular radiating aperture, the G.T.D. diverges on the axial caustic. We show that the caustic correcting factor proposed by Keller can only be used in farfield zone for, in near field zone, it gives different (and inacurrate) results i

LUNEBERG REFLECTORS OPERATING IN CIRCULAR POLARIZATION F. DACHERT - J. GELIN ABSTRACT The polarizers of radars operating such a way that this type of radar berg reflectors. in circular polarization are built in cannot be tested with traditional Lune- We describe here a new class of Luneberg reflectors equipped with a special reflecting structure made up of a grating of metal wires and a me

DUAL-POLARISED REFLECTOR MODE GENERATOR FOR CROSS-POLAR CCMPENSATION IN OFFSET PARABOLIC .ANTENNAS B. K. WATSON, A. W. RUDGE and N. A. .ADATIA ABSTRACT It has been recently shown that the depolarisation and beam-squinting effects exhibited by offset parabolic reflector antennas can be suppressed by means of techniques based upon focal-plane field matching and the use of higher-order wavegu

REAL TIME INFRARED DETECTION OF SURFACE CURRENT DENSITY DISTRIBUTIONS Robert W. Burton* ABSTRACT The current density detection and accurate measurement by probes of surface distributions is a tedious and costly experimental pro- A technique for the rapid measurement of the magnitude of these distributions by an infrared scanner is presented. By utilizing the small but significant 12R hea