MICROMAVE SHAPING FILTER FOR DIGITAL SATELLITE COMMUNICATIONS L. Accatino (*), R.J. Cameron (**) ABSTRACT The introduction of transmission zeros into the well-known all-pole Butterworth transfer function leads to prototype filters having attenuation peaks outside the passband and full band equalisation of the group delay still retaining the typical well-matched reflection. Such kinds of filters p

12 GHz I.F. AMPLIFIER FOR THE ITALSAT GLOBAL PAYLOAD P. Galante - G. Brambilla - S. Cecchi - E. Mazzola (*) ABSTRACT This paper describes to be used in the ITALSAT. The IFA features Mode 2 as linear, the 12 GHz Intermediate Frequency global coverage payload of the modes: Mode gain, amplifier. Mode 2 is 1 as limiting accomplished Amplifier (IFA) Italian Satellite amplifier by a and Switch

A LINEARIZED L-BAND 200 WATT TWT AMPLIFIER FOR MULTICARRIER OPERATION J. Czech * Abstract In communication satellite transponders for mobile users, very powerful transmitters with multicarrier (linear) operation capability and high RF to DC efficiency are demanded. The travelling wave tube amplifier (TWTA) is the best candidate for high efficiency, but the linearity has to be improved by u

A GaAs MMIC MODULATOR FOR SATELLITE COMMUNICATION APPLICATIONS M. Cuhaci and M.G. Stubbs ABSTRACT This paper presents the results of a monolithic, 12 GHz BPSK modulator which utilizes FETs as the switching elements. The performance of a QPSK modulator using two of the MMIC chips is also presented, of key components to be used in a fully-integrated version and the results are discussed.

MEASUREMENT OF THE COMPLEX PERMITTIVITY OF CURVED DIELECTRIC RADOME SPECIMENS USING AN OPEN RESONATOR W.F.P. Chan and B. Chambers Abstract A technique for the measurement of the complex permittivity of curved dielectric radome specimens using an open resonator is reported. By using perturbation theory, a modified compensation term has been derived to deal with relatively large deviation of the sp

AN EXPERIMENTAL TECHNIQUE TO EVALUATE THE COMPLEX PERMITTIVITY SAMPLES OF MICROWAVE SUBSTRATES. D. Higginbottom, M.J. Howes and J.R. Richardsont OF SMALL ABSTRACT Perturbation theory is applied to a rectangular resonant cavity to measure the complex permittivity of small rectangular samples of microwave circuit substrates at X-band frequencies. The technique employed is non-contacting and requir

A COMPUTERCONTROLLED HOMODYNENETWORKANALYSER WITH PHASE SHIFT KEYING AND ERROR CORRECTION FOR 26.5 - 40 GHz JORGEN SCHNEIDER AND BURKHARD SCHIEK ABSTRACT This paper presents a homodyne network analyser working over the full Kaband (26.5 - 40 GHz). The system employs three cascaded binary phase shifters and downconverts the modulated RF-signal to the baseband, where it is processed by a microcompu

A LOW-COST PHASE-MEASUREMENT SCALAR NETWORK-ANALYZERS EXTENSION FOR B.Neumeyer * I. Abstract This paper presents the extension of a scalar Network-Analyzer to a Vector-Network-Analyzer by a simple phase-measurement module. A complete phase-error correction is shown with one matched load and four (offset) shorts as calibration standards. Experimental results measured from 26,5 to 40 GHz confi

A PORTABLE SIX-PORT - NETWORK ANALYZER IN X AND KA BAND- - APPLICATION M.Malkomes~ R.Walsdo~f~ F.Reiffert~ D.Seidenberg~ P.Pogatzki B§§IBB~I The design and performance of a portable 6-port network analyzer is presented. A data acquisition concept utilizing high performance electronic integrated circuitry together with integrated microstrip and fin-line 6-port detector modules have been d