MILLIMETRIC LOW NOISE PREAMP-MIXERS WAVEGUIDE TRANSMISSION SYSTEMS FOR APPLICATION WITH CIRCULAR MAHIEU Jean-Rene - HENAN Jean-Paul L/ ABSTRACT Preamp-mixer specifications are defined by system considerations. Technological developments are described for realization of low noise millimetric mixers using chip Schottky diodes in honeycomb structure. Similar diodes can be used either in micro



MICROWAVE SA TELLITE RECEIVER FOR ESRO ORBITAL TEST P. de BA YSER 0 / Yl \I Abstract A 14 GHZ receiver designed for OTS is show n. After a quick survey of critical specifications, pointing out which ones have got an impact on the design choice and reasons of choices are explained. A short theoretical point is discussed: how overall performances of a receiver can be deduced from performa

A MULTIBEAM CASSEGRAIN ANTENNA H. Gniss and E. Zocher ABSTRACT This paper deals with generation of a multibeam pattern for three-dimensional radar surveillance by a stacked feed horn system installed in a Cassegrain antenna. Although its effective f/D-ratio is relatively high compared with the corresponding one of the primarily feed paraboloid, lateral displacement of feed horns in the focal pla

CYLINDRICAL PARALLEL-PLATE M. Uhlmann PHASED ARRAY WITH PIN-DIODE CONTROLLED FEEDING SYSTEM. Abstract: A comparison of feeding systems for Cylindrical Phased Arrays presently known shows that most of them have the serious disadvantages of complexity and relatively high losses. This is due to the requirement of controlling not only the phase, but also the amplitude distribution over the arr

A New Numerical Approach to Planar Phased Arrays. L.P. Ligthart. ABSTRACT In examining the directivity characteristics of planar phased arrays, an expression in the form of a double summation approximation to the double integration of the array pattern is conventionally used. This procedure is computing time-intensive. In this paper an exact closed-form expression for the directivity functi



SIDELOBE-REDUCTION TECHNIQUE FOR ARRAYS WITH BLOCK PHASE EXCITATION David K. Cheng * and Naohisa Goto t ABSTRACT Block phase excitation in a large phased array reduces circuit complexity and system cost but results in high side lobes in certain directions. This paper introduces a technique for determining the locations and levels of the prominent sidelobes when each phase shifter is used t

MICROSTRIP COMB LINE FILTERS Roland Briechle + ABSTRACT The known design procedures for comb line filters are applicable only to filters using TEM-mode transmission line systems. Synthesis procedures for comb line filters using coupled microstrip transmission lines must take into account the unequality of the phase velocities of the fundamental modes on such a system. Such a method is presen

A NUMERICAL METHOD FOR THE DESIGN OF n-MICROSTRIP FILTERS R. De Leo - M. De Sario ABSTRACT A numerical arbitrary parallel the the design The function. strip lines method and more are taken evaluation the is reported structures generally into for the design like the hairpin, losses hybrid of filters composed of n-microstrip accuracy meander, and the half-wave coupled in with structures. I