A dielectric rod E.M. model for welllogging applications Thllio Rozzi, Leonardo Zappelli Dipartimento di Elettronica ed Automatica Universita di Ancona, Via Breece Bianche 60131 Ancona - Italy E-Mail: zappelli-anvaxl.unian.it Fax: +39 71 2804334 Abstract The propagation of electromagnetic fields in borehole in presence of perturbations is analyzed by means of coupled mode theory based on the guide

A 125-180 GHz fixed-tuned SIS mixer for radioastronomy A Karpov, J Blondel, P Pasturel, K H Gundlach. IRAM, 300 rue de la Piscine, F - 38406 St. Martin d'Heres, France. Tel. (33) 76 82 49 00 Fax (33)-76-51-59-38 E-mail: karpov-iram.fr Abstract A fixed-tuned SIS mixer covering an instantaneous band of 45% around 150 GHz has been developed for radioastronomy. A new type of coplanar tuning circuit fo

Upgrade of the Westerbork synthesis radio telescope: The multi frequency front end GHTan Netherlands Foundation for Research in Astronomy, Dwingeloo Radio Observatory, PO Box 2, 7990 AA Dwingeloo, The Netherlands. Abstract The performance of a novel front end system, the Multi Frequency Front End (MFFE), for use in a synthesis radio telescope is discussed. This front end covers 9 frequency bands i

Evaluation of trellis coded modulation effects in time-selective fading mobile radio channel Milica Pejanovic, Zoran Veljovic and Zoran Petrovic. Faculty of electrical engineering, University of Montenegro, 81000 Podgorica, Yugoslavia. Abstract In this paper effects of trellis coded modulation in mobile radio systems are evaluated. The specific channel with timeselective fading process is consider

A physical wide-band propagation model for outdoor mobile radio communications Wei Zhang Helsinki University of Technology, Institute of Radio Communications, Radio Laboratory, Otakaari 5A, FIN 02150 Espoo, FINLAND. TEL.: +3580451 2255 FAX: +3580451 2152 E-Mail: WZH-radio.hut.fi Abstract This new work makes a physical wide-band propagation model for outdoor mobile radio communications. First, the

Analysis of a rotationally symmetric cellular phone with a monopole antenna Robert Leijon, Per-Simon Kildal* Ahmed Kishk** *Antenna Group, Department of Microwave Technology, Chalmers University of Technology, Sweden. **University of Mississippi, USA. Abstract A rotationally symmetric cellular phone with a monopole antenna is comprehensively analysed. The radiation efficiency is studied as a funct

Comparison of wideband measurements with antenna and radiating cable as transmitting elements in an indoor environment Torsten Englert, Ralf Kattenbach and Henning Friichting RF-Techniques / Communication Systems, University of Kassel, 34109 Kassel, Germany E-mail: engl-hfk.e-technik.uni-kassel.de Abstract This paper reports on wideband measurements at 900MHz with a bandwidth of 600MHz in an indoo

L-band internally matched front-end Si-MMIC Noriharu Yoshitada Suematsu, Masayoshi Ono, Shunji Kubo., Hisayasu Sato.., Iyama and Osami Ishida Information Technology R&D Center, Mitsubishi Electric Corp. 5-1-1 Ofuna, Kamakura-city, Kanagawa 247,JAPAN * ULSI Laboratory, Mitsubishi Electric Corp. 41 Mizuhara, Itami-city, Hyogo 664,JAPAN ** System LSI Laboratory, Mitsubishi Electric Corp. 4-1 Mizuhar

Correlation between gate current and RF power performances of millimeter HEMT's C Gaquiere, B Bonte, E Bourcier and Y Crosnier Institut d'Electronique et de Microelectronique du Nord U.M.R. - C.N.R.S. 9929, Departement Hyperfrequences et Semiconducteurs, Avenue Poincare, B.P. 69, 59652 VILLENEUVE D' ASCQ CEDEX - FRANCE Abstract An original study on the power limitations of PHEMT's is presented usi

26th EuMC. 9-12 September 1996 . Hotel Hilton Atrium. Prague. Czech Republic Simultaneous electrical and thermal modeling of mm-wave FETs A Abdipour and A Pacaud. Dept of Radioelectricity and Electronics, Supelec, Plateau de Moulon-91192 Gif-Sur-Yvette Cedex, France. Abstract This paper describes simultaneous electrical and thermal modeling of signal and noise properties of the millimeterwave FET