A Monolithic Voltage Controlled Directional Coupler M.J.Cryan, P.R. Shepherd, S.R.Pennock School of Electronic and Electrical Engineering, University of Bath, Claverton Down, Bath, BA2 7AY. ABSTRACT A wide FET is considered as a voltage controlled di. rectional coupler. A model for the device has been developed taking into account the distributed nature of the device. Measured and modelled six por

MONOLITHIC DESIGN CONCEPTS FOR NOVEL MICROWAVE PLANAR ACTIVE FILTERS L. BILLONNET - A. BRUCHER - C. CENAC - M. DELMOND - Ph. MEUNIER B. JARRY - P. GUILLON I.R.C.O,M - Universite de Limoges 123, Avenue Albert Thomas 87060 Limoges Cedex FRANCE Tel: 55-45-72-63 Fax: 55-45-75-14 - - S.E. SUSSMAN-FORT Department of Electrical Engineering State University of New York at Stony Brook Stony Brook, New Y

SUB-MILLIW ATT DC POWER DOUBLE BALANCED DOWN MIXER AND SUBHARMONIC PHASE DETECTOR FOR L-BAND APPLICATIONS i M. ~Chn1~tz,ETH Ziirich~Lab. for E~{J:;ields and Microwave Electronics, Gloriastr.35, CH-809ZZurich, Swi~r1and; FAX +41 I 632 II 98; Tel +41 1'63254 OS' ( ABS~cr : A very low power double balanced mixer with a conversion gain of 17 dB at 1 GHz has been designed. It consists of a common

ESTIMATION OF MELTING-SNOW COMMUNICATION LINKS LAYER ATTENUATION AND SCATTERING ON MICROWAVE M.M.Z. Kharadly and RA Hulays Department .ofElectrical Engineering, University of British Columbia ABSTRACT The presence of the melting-snow layer has significant effects on propagation in two respects, which should be considered in the design of microwave satellite and terrestrial communication links.

BACKWARD AND FORWARD SCATTERING BY THE MELTING LAYER COMPOSED OBLATE SPHEROIDAL HYDROMETEORS AT 5-100 GHz' W Zhang Helsinki University of Technology, Radio Laboratory/Institute of Radio Communications, 5A, FIN 02150 Espoo, FINLAND. TEL.: +3580451 2255; FAX: +3580451 2152; e-mail: WZH-radio.hut.fi ABSTRACT OF Otakaari This paper reports the study of the differential reflectivity, specific attenu

DEVELOPMENT OF A PROPAGATION MODEL FOR THE DESIGN OF LOW AVAILABILITY SATELLITE COMMUNICATION SYSTEMS+ F. Barbaliscial, M. Boumisl, A. Martelluccil, F. Mazzengal, J. P.V. Poiares Baptista2 (1) Fond.'1ZioneUgo Bordoni, Viale Europa 190,00144, Roma, Italy Tel. +39 6 5480 2119 , Fax +39 6 54804401 (2) ESAIESTEC, P.O. Box 299, Noordwijk, The Netherlands , Tel. +311719 84319. Fax +31171917400 ABSTRACT

VARIABILITY AND DYNAMIC CHARACTERISTICS OF ATTENUA TION DERIVED BY GROUND-BASED MICROWAVE RADIOMETER. Ennanno FIONDA 1, Antonio MARTELLUCCI1, Ed R. WESTW ATER2 (1) Fondazione Ugo Bordoni (FUB), Roma, Italy Tel. +39 (6) 5480-2118; Fax +39 (6) 5480-4401; E~Mail fubdptl-itcaspur.earn (2) NOAAlERLlETL, Boulder, CO, USA Tel. +1 (303) 497-6527; Fax +1 (303) 497-6978; E-Mail ewestyvater-wpl.erl.gov ,:. i

A 20/30/50 GHz RADIOMETER FOR USE IN THE ITALSAT PROPAGATION EXPERIMENT B.N. Lyonsl and A.V. Bosisi02 1 - Farran Technology Ltd., Ballincollig,Co. Cork, Ireland. 2 - PolitecnicQ di Milano, Dipartimento di Elettronica e Informazione, Italy. , , , ' ~", ,'. .ABSTRACT ." . . ~ c, . A new 20/30/50 GHz radiometer has been developed for use in a propagation experiment to characteriseatmospheric at

MICROWAVE PROPAGATION IN VEGETATION MEDIA A Hammoudeh and M AL-Nuaimi University of Glamorgan-UK ABSTRACT Attenuation of microwave signals at 11.2 GHz through a conifer wood and a regularly planted apple orchard is investigated. The measured attenuation values were modelled as a function which represents the loss L in dB asL= Kd* where d is .thefoliage depth in metres and k is a constant. The ba

ANALYSIS OF tRANSIENT RESPONSE OF COUPLED NONuNIFORM TRANSMISSION IJNES USING MODIFIED CENTRAL DIFFERENCE METHOD Kazuhito Murakami* and Junya Ishii** ... * Computing Center, Kinki University'" ** Department of Electronic System an~ Information Bngineering, KinkiUniversity ,\ ~... .... '" , ., -. , ,~ ABSTRACT: In this paper that the pulse expression. propagation we present the modified ce