A GaAs FEr DESIGNED FOR MAXDlUMFLEXIBILITY IN ELECTRICAL PERFORMANCE M. Bujatti and M. Massani ABSTRACT A simple process has been developped which enables us to produce GaAs FET's with enough flexibility in the geometry to adjust for a wide range of circuits requirements. In order to gain control on the active layer we used ion implantation on semi-insulating substrates. Results obtained an e

OF THE NOISE PARAMETERS OF THE GaAs MESFET ON TECHNOLOGY, PARASITIC COMPONENTS AND BIAS CONDITIONS IN THE FREDEPENDENCE QUENCY RANGE UP TO 12 GHz + Chr. Tsironis and H. Beneking Abstract A procedure is described, which permits the theoretical determination of the influence of bias conditions, technological parameters and parasitic components on noise behaviour of microwave GaAs-MESFETs in the GHz

RECENT ADVANCES IN SOLID STATE MICROWAVE DEVICES G. Gibbons ABS 1RACT In this paper recent advances in three areas of microwave solid state devices will be discussed, namely GaAs FETs, InP TEDs and Si TRAPATTs. A common factor in advancing the performance capability and yields of these devices has been improvements in materials technology. GaAs FET noise figures below 1.5 dB are now achievable

LOW-LOSS WAVEGUIDEFILTER WITH IMPROVEDFAR-SELECTIVITY G.Reiter and V. Geleji ABSTRACT A rectangular waveguide. bandpass filter with improved harmonic suppression is described.The first resonator of the filter is made in an evanescent-mode guide section. This combined construction keeps the passband losses low and a significant improvement in the stopband performance can be achieved.Calculation

MULTI-PATH NETWORKS I SHAPING N D Kenyon A NOVELAPPROACHTO LINEAR-PHASE FILTERING AND ABSTRACT The paper presents a novel approach to the design of filtering and shaping networks having perfectly linear phase response and good input match at all frequencies, albeit with appreciable transmission loss. The method involves the provision of several transmission paths between the input and the out

A NEW CLASS OF DUAL-M0DE MICROWAVE FILTERS FOR SPACE APPLICATION S. Kallianteris +, C.~. Kudsia +, and M.N.S. Swamy t Abstract A new class of direct-coupled cavity bandpass filters having the same number of equi-ripple attenuation-zeros as the order of the filter and an attenuation-pole on either side of passband is described. Filters are configured in dual-mode structure operating in th

THE DEVELOPMENT OF CIRCULAR WAVEGUIDE TEgN MODE FILTERS I.L. Powell, * B.K. Watson*, and J. Weale* R. A. Waldront *GEC-Marconi Electronics Ltd., Marconi Research Loboratories, Great Baddow, Chelmsford, Essex, U.K. tDirector of Studies, Ulster College, The Northern Ireland Polytechnic, Jordanstown, Co. Antrim, N. Ireland. ABSTRACT Unwanted circularly symmetric modes of the TEON family are generat

APPROXIMATE SYNTHESIS OF TEM MODE TRANSMISSION-TYPE DIRECTIONAL FILTERS J.L.B. Walker ABSTRACT An approximate synthesis technique is described for TEM mode transmission-type directional filters for which only a hand-held electronic calculator is required to compute the element values. In the example given the element values differ by less than 1.5% from the values calculated by an exact techniq

EXACT EFFICIENCY EVALUATION IN LOADED DIFFUSED OPTICAL WAVEGUIDE MODULATORS V.Andresciani, M.N.Armenise, M.De Sario ABSTRACT In this tric crystal sion method. in the first the second paper, we consider in order The multilayer the optical film is parallel. spacing an overlayed structure cases erfc diffused LiNbO to design axis a planar-type modulator by the mode 3 ferroelecconver- is a

THE THEORY FOR THE DIELECTRIC LASERS SLAB WAVEGUIDE WITH COMPLEX REFRACTIVE INDEX APPLIill TO GaAs Jens Buus * ABSTRACT In this paper we investigate the homogeneous dielectric slab waveguide in the case of complex dielectric constants. A method for calculating the field distribution in a dielectric waveguide with an arbitrary symmetrical variation in the refractive index is developed, and