COMPUTER PHYSICAL AIDED DEVICE DESIGN MODELS AND CHARACTERISATION OF MMIC OSCILLATORS USING Christopher M Snowden ABSTRACT A computer aided design and characterisation technique, based on comprehensive physical device models, is described which has been applied to MMIC oscillator circuits. The technique uses time-domain device and circuit simulations to predict the frequency, po

A 2 STAGE X-BAND LOW-NOISE AMPLIFIER GALLIUM ARSENIDE IC C.W. Suckling ABSTRACT A two-stage GaAs IC low noise amplifier has been developed to cover the 7-11 GHz frequency range, which encompasses both the 7.25-7.75 GHz satellite downlink band and the 9-10 GHz radar band. This paper will describe the design, layout and measured performance of this circuit, including the variation in its ga

CC1v1PUIER-AIDED DESIGN OF MICROWAVE INfEGRAJ'ED CIRCUITS M.I. Sobhy and A.K. Jastrzebski Abstract: This paper describes a general computer program for the analysis and design of passive, active and non-linear lumped/distributed circuits. This program is particularly suitable for the analysis of active microwave networks and GaAs integrated circuits. 

HIGHLY EFFICIENT FEEDING NETWORK Aleksandar Nesic*, TWO-DIMENSIONAL PRINTED ANTENNA ARRAY WITH A NEW Velimir Trifunovic* and Branka Jokanovic* ABSTRACT A printed broadside two-dimensional array of anti resonant dipoles at the frequency of 17 GHz with a gain of 28 dB is presented. A new concept of radiating elements and subarrays feeding is applied, thus providing high efficiency. The ar

BEAM FORMING NETWORK FOR A MULTIBEAM ANTENNA AT 20 GHz Doro G. * , De Gennaro F. * , Lisi M. ** ,Roederer A.*** ABSTRACT A multibeam antenna, which generates 115 Area Beams for European Continuous Coverage and 12 City Beams to cover 12 main ground stations, has been defined. Area and City Beams are generated by the same array of feeds and are isolated through polarization discrimination. On

3-D MULTIPLE BEAM FORMING LENSES FOR PLANAR ARRAYS G.C. Sole and M.S. Smith* ABSTRACT Theoretical multiple beam patterns for a planar array with 4 diameter are presented, with a three dimensional "bootlace" lens feed. The waveguide fed lens is 6 long, and provides beams scanned to ± in both 30º principal planes, with predicted sidelobes < 23dB. - 

BEAM STEERING METHOD WITH IMPROVED SIDELOBE DIELECTRIC WEDGES FOR SATELLITE TV RECEPTION C D McEwen and M R Khan RESPONSE USING ABSTRACT: The paper describes a method of steering a beam in two dimensions using a pair of dielectric wedges placed in front of an antenna. Theoretical studies show that beam steering can be achieved together with a slight improvement in the sidelobe level. Measured r

POWER CALCULATIONS IN CLOSED MICROWAVE SYSTEMS M. DE POURCQ ABSTRACT The field and power distribution in a closed microwave system are calculated using a variational principle and three-dimensional finite elements. The system may contain linear, lossy, arbitrarily shaped, isotropic and inhomogeneous materials. The accuracy is tested on an example which can be solved analytically. Besides som

SENSOR FOR MEASURING THE MASS PER UNIT AREA OF A DIELECTRIC LAYER Ebbe Nyfors, ABSTRACT Pertti Vainikainen A sensor for non-contact measurements of the thickness or mass per unit area of a dielectric layer has been developed. It has been constructed for measuring a cake of wooden particles on a steel band in the particle board industry. The sensor is suspended at a distance above the layer of

DETERMINATION OF MOISTURE COMPARED WITH CAPACITIVE, INFRARED AND CONDUCTIVE MEASUREMENT METHODS. COMPARISON OF ON-LINE MEASUREMENTS AT COAL PREPARATION PLANTS. MICROWAVE Albert Klein* ABSTRACT The accuracy of microwave, capacitive, infrared and conductive measurements was tested under industrial conditions with regard to on-line determination of moisture in coal. The test was carried out on a