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

NOVEL MICROWAVE TECHNIQUE FOR INDUSTRIAL MEASUREMENTS Wolfram Schilz ABSTRACT: Based on traditional microwave techniques a new branch is rapidly growing: The application of microwaves for industrial measurements and process control. In many cases microwaves are superior to other methods because of the specific microwave behaviour of materials and the possibility of contact-free, remote probing.



COMPACT LOW LOSS L-BAND DIPLEXER FOR SPACE APPLICATIONS E. Andersen, ABSTRACT M. Mathiesen, J. Wested For application in satellite multibeam arrays, a compact low loss diplexer has been developed.' Branch filters using temperature compensated cylindrical dielectric resonators mounted in a circular cut-off waveguide give a mechanically simple and robust construction with excellent on boar

AN 18 CHANNEL, PHASE-MATCHED, SINGLE-CONVERSION UPCONVERTER FROM 30MHzTO Author: A.A. Goaaher L-BAND ABSTRACT An 18 channel, phase-matched Upconverter has been developed Space and Defence Systems Ltd. The Upconverter translates separate IF signals from 30MHz to L-Band while maintaining phase and amplitude relationships. by the Marconi 18 the channel To ease phase tracking problems a sub-harmoni

L-BAND GaAs FET AMPLIFIER L. NEVIN* I. AND R. WONG* ABSTRACT Low noise GaAs FET amplifier performance is enhanced at 1-2 GHz frequencies through the use of source inductance feedback. A simple circuit model predicts noise and signal performance and is used to derive matching circuits for the amplifier design. A 1-2 GHz single stage amplifier, designed on the basis of the modeled results, demon

BIPOLAR AND F.E.T. COMMUNITY POWER AMPLIFIER FOR A 2.6 GHz TELEVISION TRANSPONDER Authors: J.A. Vaughan, F.G. Sawyer and M.J. WiZZiams. ABSTRACT This paper describes the'design of 2.6 GHz, high gain, high power transistor amplifiers for use in a satellite transponder for a community television and radio broadcast service. Two power amplifiers are described: internally matched * A Class