AN OPTIMISED TWO GIGABIT DUAL GATE FET SWITCH FOR SATELLITE SYSTEMS USING QPSK MODULATORS H.J. Finlay ABSTRACT With the present trend for high quality digital modulation systems having fast modulation rates and low bit error rates it is beneficial to combine such features with low power consumption and size reduction. A suitable candidate, particularly for space applications, is the GaAs dua

70 MHZ TO 6 GHZ FET UP-CONVERTER P. Bura* ABSTRACT Performance of an MIC FET Up-Converter from 70 MHz IF to 6 GHz output, with to the Up-Converted output. 15 dBm output in the amplifier signal was measured circuit. from shows 3.5 dB conversion 0 dB conversion loss from gain the LO a FET capable of 21 dBm output 

LINEARIZATION OF RADIO-RELAY TRANSMITTERS BY A PREDISTORTION UPCONVERTER S. Lenz * ABSTRACT A new principle for linearizing a radio-relay transmitter is described. The method operates according to predistortion principle and uses two parallelconnected upconverters whose operation points are set differently. One of the mixers has a high intercept-point, while the other works in the nonlinear r

MIC IMAGE-REJECT FOR RADIO-LINK Ulrich H. Gysel AND -ENHANCEMENT MIXERS APPLICATIONS ABSTRACT A class of broadband image-reject and enhancement mixers for radio-link applications has been developed. The mixers are constructed in microwave-integra ted-circuit (MIC) fonn. Their design concept is explained and details of the actual implementation are presented. Typical perfonnances for 3.8 to 4.2

A BETTER UNDERSTANDING OF IMAGE RECOVERY MIXERS T.H. OXLEY AND P.L. LOWBRIDGE * ABSTRACT This paper discusses different forms of microwave mixers which exhibit image rejection characteristics using phasing techniques. Mixers operating in S, X and J(Ku) bands have been evaluated and the results are discussed. 

PERMITTIVITY DETERMINATION USING TIME-FILTERED ON BOUNDED DATA FROM ANTENNA-NEAR-FIELD MEASUREMENTS STRUCTURES by F. Caspers and H. Chaloupka ABSTRACT: Results of free space measurements on plane dielectric layerstructures are influenced by boundary inhomogeneities, if the structure is bounded. This influence may be eliminated by timefiltering, which often requires a configuration, where

APPLICATION LOCAL OF AN OPEN COAXIAL-LINE RESONATOR FOR THE DETERMINATION OF THE OF LOW-LOSS THIN SLABS AT MICROWAVE FREQUENCIES PERMITTIVITY H. Moschliring and I. Wolff ABSTRACT - A non-destructive method for the determination of the local dielectric constant of thin slab-like materials is investigated. The dielectric material is brought into the electromagnetic fringing field of a suitable

ACCURATEEXPERIMENTAL IDISE CHARACTERIZATION GaAs FEr's OF 20 GHz THROUGH THE USE OF THE NOISE WAVESM:>DEL. R. ~s (x), M. Milecan (xx) AT 18 AND ABSTRACT The noise tanperature mined as a function of FEr's at 18 and 20 GHz is experinentally deterof the source reflection factor through the use of the recently developed noise waves roodel. - . The nethod appears to be able to provide unbiased

THE MEASUREMENTOF MODULATION NOISE IN MICROWAVE OSCILLATORS Daniel J Esdale, Michael J Howes*and Roger D Pollard ABSTRACT A novel technique is described for the measurement of modulation noise in microwave oscillators. The basis of the system is a delay line discriminator employing a four-port junction, the system is readily set up and calibrated and is inherently broadband. It is easy to ope

PARALLEL-COUPLED-LINE SUBSTRATE MIC's. FILTERS FOR INVERTED-MICROSTRIP AND SUSPENDED- B. Easter and K.A. Merza. ABSTRACT An improved design procedure is outlined for parallel-coup led-resonator filters in non-homogeneous media such as inverted micros trip and suspended stripline. A modified filter section is used, comprising a parallelcoupled o.c. section in cascade with short un-coupled li