DIRECTIVE MICROSTRIP ANTENNAS D.MarkopoulOS*, P.Catechi ABSTRACT Planar, directive, X band antennas were constructed with wide microstrips printed on phainolic paper substrates. Every microstrip functions as a cavity with loses due to radiation from the slots formed between their wide edjes and the earth plane. A number of approximations, mentioned below, form the theory of their opperation. A

VARIPHASE COUPLER Jeffrey T. Nemit ABSTRACT A new approach to the design and construction of phased array antennas has been developed which utilizes a device called a "Variphase Coupler". This device provides variable-phase coupling to a waveguide-type radiator from an integral waveguide feed, by means of diode-controlled waveguide slots. The principal advantage of this approach is that it comb

SATELLITE MENT COMMUNICATION SYSTEMS - STATE OF THE ART AND DEVELOP TRENDS - Telespazio - Rome, Italy By S. Tirro ABSTRACT In connection with the present development trends of the technology, and with the subsequent service rendering capability, the role of communication satellites in future is discussed. Three basic types of systems are considered: for Mobile communications for Point-to-

SELF-ADJUSTABLE MICROWAVE HOMODYNE CIRCUIT FOR ON-LINE SIMULTANEOUS ATTENUATION AND PHASE MEASUREMENTS Jerzy Kalinski Abstract: A chopped subcarrier method and a self-adjustable microwave homodyne circuit for simultaneous on-line attenuation and phase measurement under industrial conditions is presented. Substantial independence of measurement results on such metrological parameters of the circui

COMPLEX PERMITTIVITY OF MOROCCAN PHOSPHATE CONTENT. AS FUNCTION OF MOISTURE M. NAJIM*. M. ZYOUTE. K.NAJIM and T. OUAZZANI ABSTRACT This paper deals with the experimental results of hertrian spectrum analysis of phosphate as function of moisture content. A study has been developed in the microwaves frequencies range the results of this study has been used to built a moisture rate controlle



A MICROWAVE SPECTROMETER IN INDUSTRIAL B. Schiek, APPLICATIONS - SUITABLE FOR GAS ANALYSIS T. Paukner, W. Schilz * ABSTRACT: A compact spectrometer has been developed, operating between 18 and 26 GHz, suitable for industrial gas analysis in process and pollution control. The system is all solid state and may operate automatically. Care has been taken to minimize the system noise figure, amon

BROADBANDING OF A SUBMILLIMETRE-WAVE BACKWARD-WAVE OSCILLATOR R. Bonnefoy*, G. Kantorowicz** ABSTRACT and P. Palluel** As a consequence of the interest shown by astronomers for observation on board a space platform in the submillimetre-wave range, the European Space Agency has initiated a research and development programme on components required for advanced submillimetre-wave heterodyne detect

A ONE MEGAWATT, SEVEN PER CENT BANDWIDTH, PULSED KLYSTRON AMPLIFIER PERRING, D., PHILLIPS, G. and RANDALL, J.P. ABST RACT The paper reports on aspects of the design of a broadband klystron amplifier currently going into production. The tube has a low interception gridded gun, an overlapping mode extended interaction output section and a seven cavity buncher section. The design of buncher secti

A TRIPLE-POWER-MODE ADVANCED 11-GHz TWT D. Henry*, ABSTRACT A. Pelletier* and R. Strauss** Described is an advanced-performance 11-GHz TWT, developed by THOMSON-CSF for INTELSAT. Intended for future communicationsatellite programs, this TWT is based on an existing spacequalified tube (a 20-watt/11-GHz model), but has been designed for operation at three different power levels:20, 8 and 4 wat