ELECTROMAGNETIC NON-PERTURBING MICROPROBES A. DEFICIS, A. PRIOU (+) ABSTRACT: Since recherches temperature 1971, the Microwave Department of the 'Centre d'etudes et de de Toulouse' is effecting research on the problem of measuring and power density in electromagnetic fields. of obtaining a dielectric waves was studied. microprobe not interfering with The possibility electromagnetic 

A~THOD MILLIMETER M. Spalla TO MEASURE THE CHARACTERISTICS WAVES Tamburello, L. Zanforlin + OF BIOLOGICAL. MATERIALS AT o,C. ABSTRACT - A new method of biological sample characterization at millimeter waves has been studied to verify and extend Webb's experimental results. This method, based on interferometric measurements, is suitable to obtain an absorption spectrum of a living bacteria

MEASUREMENTS OF 0.915, 2.45 and 9.0 GHz ABSORPTION IN THE HUMAN EYE L-E.Paulsson ABSTRACT The absorption of microwave power on the axis of the eye was measured at 0.915, 2.45 and 9.0 GHz on a model of a human head. The absorbed power shows an essentially exponential decrease with the distance from the cornea at 9.0 GHz. At 2.45 and 0.915 a maximum in the absorbed power pattern occurs within the

NOISE SUPPRESSION IN MICROWAVE IMAGERY BY EXPLOITATION OF THE MTF APPROACH TO HUMANVISION A.P. Anderson,* P.R. Armstrong,* J.C. Bennett,* + and J.E.W. Mayhew ABSTRACT Optimised presentation of images from a microwave holographic system is essential, particularly the suppression of the effects of noise on the human visual system. Recent research into the human visual system has led to Fourie

A 'MICROWAVE EYE' CAN BE ALMOST HUMAN A.P. Anderson and S.J. Mawani ABSTRACT Microwave imagery is commonly accepted to have inherently lower resolution than optical systems produce, and small scale microwave imaging systems should be particularly poor in this respect. Since Man is an optical imaging system, and also the ultimate recognition system, it is interesting to compare his performance

SPHERICAL NEAR-FIELD FAR-FIELD TECHNIQUES* Frank Jensen** and Flemming Holm Larsen*** ABSTRACT Spherical wave expansions are well suited to transform measured near-field data of an antenna to far-field data. In this paper a comparison between techniques for obtaining spherical wave expansions from near-field measurements is presented. The techniques are compared with respect to requirements

A NEW LOOK PROBLEMS AT THE INTEGRAL EQUATION SOLUTION OF HIGH FREQUENCY DIFFRACTION Raj Mittra ABSTRACT In this paper we report a transform method for combining the integral equation and high frequency asymptotic techniques, e.g., the geometrical theory of diffraction or GTD. The method takes advantage of the fact that the Fourier transform of the unknown surface current distribution is p

INTEGRAL EQUATION FOBMU~ION RADIATION ~cay FOR PREDICTION 0"' FAR-PIELD PATTERNS FROM NEAR-FIELD MEASUREMENTS mRAND ABSTRACT An integral equation formulation in which the plane wave spectrum functions of a measured aperture appear as the unknowns is presented. Solutions to this equation are obtained by expanding the unknwons into sampling series and enforcing the equation at a finite number

TRANSIENT Karl Jorg FIELDS OF RADIATING and Klaus STRUCTURES D. Rech* Langenberg ABSTRACT A rather simple and general analysis allows calculation of the exact transient near- and far-fields of thin loop antennas, thin linear antennas and apertures directly in the time domain without the knowledge of the time harmonic field. A numerical method (SEM) is used to derive the influence of the anten

MICROWAVE IMAGING OF ROTATING OBJECTS WITH NARROWBAND SIG NALS H. Gniss, K. Magura ABSTRACT The experimental investigations as described in this paper are based upon the evaluation of image-field distributions from the scattered fields of rotating objects measured at 36 GHz. Starting with a discussion of the reconstructing formalism and a suitable conversion into Fourier integral form, which is