, HIGH-PERFORMANCE MICR0STRIF;COMPONENTS FOR MOBILE-RADIO ANTENNA SYSTEMS A. Angelucci, P. Audagnotto, P. Corda, F. Piarulli, B. Piovano CSELT.. CENTRO ,STUDI! E LABORA'J'OR1- TELECOMUNICAZIONI ~i G.REISS ROMQLI,,274..10143,-TORINO-IT,A.LY ., ,I \' f... f I ~ This paper presents the development of high performance multiport hybrid networks based on the Butler-matrix and a new type of phase-s

THE NON-CONTACTING FEEDING STRUCTURES OF THE PRINTED ANTENNAS .~., " Wojciech J. Krzysztofik, Technical University QfWrodaw, POLAND The feeding mechanism of the printed antenna elements via electromagnetic coupling with a printed tramsmission line is \investigated. Three novel methods of excitation, namely proximity coupled patch antenna (PCP A), proximity-coupled iradiating aperture (PCRA), an

High Perform~ce Analogue MMIC Control Devices for Adaptive Phased Array Applications. s. Lucyszyn and I. D. Robertson Communications Research Group Department of Electronic and Electrical Engineering King's College, University of London, Strand, London, WC2R 2LS, UK Tel.: + 44 71 8732390; Fax: + 44 71 8364781 ABSTRACT Three different MMIC analogue reflection~type control devices are presented. The

Low loss power splitter for antenna beam forming networks using probes in a waveguide M. Dich and M. Dahl Mortensen Electromagnetics Institute, Technical University of Denmark Building 348, DK-2800 Lyngby, Denmark Telephone +45 4288 1444 Fax +45 4593 1634 1 ABSTRACT The design of a low loss one-to-four power splitter suitable for beam forming networks in antenna arrays is presented. The power s

BROADBAND, LOW-NOISE ACTIVE RECEIVING MICROSTRIP ANTENNA Wilfried University Grabherr D-89069 and Wolfgang Ulm, Germany Menzel of Ulm, Microwave Techniques, ABSTRACT An active receiving microstrip antenna. operating around 10 GHz with a GaAs MESFET as active part of the antenna is presented. With the design proposed here, low-noise active receiving antennas with considerably improved bandwidth

MODIFIED RECTANGULAR PATCH RADIATOR FOR MICROSTRIP ACTIVE ANTENNAS J. Bartolic, Z. Sipus, D. Bonefacic, E. Zentner Faculty of Electrical Engineering University of Zagreb Av. Vukovar 39, HR-41000 Zagreb, Croatia ABSTRACT The applicability of a modified rectangular microstrip patch radiator for active antenna with orieport active element has been demonstrated. The modified rectangular patch antenna

60. GHz-BAND ACTIVE PATCH ANTENNA FOR SPATIAL POWER COMBINING EUROPEAN MOBILE COMMUNICATION SYSTEMS David S4nchez-Hemmdez and Ian Robertson ARRAYS IN CommunicationsResearch Group . Department of Elootronic and Electrical Engineering ,. . King's College, University of I;.ondon. Strand, London WC2R .2LS, UK. Phone:, + 44 71 8732898 Fax: + 44 71 8364781, e-mail: udee321-uk.ac.kcl.cc.bay . :' Abstra

AN IMPROVED PLANAR ARRAY PATTERN SYNTHESIS FOR SPACE COMMUNICATION APPLICATIONS F. Ares*, S. R. Rengarajan** and E. Moreno* * Departamento de Ffsica Aplicada, Facultad de Pfsica, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Spain. Fax: (34) 81520676, Tel. (34) 81 563100, Ext 4016. e-mail: f~S-usc.es ** Department of Electrical and Computer Engineering, California State Univ

SYNTHESIS OF ANTENNA PATTERNS WITH IMPOSED NEAR-FIELD AND THEIR APPLICATION H. Steyskal Rome Laboratory /ERA 31 Grenier Street, Hanscom AFB, MA 01731-3010, USA Tel: (617) 377 2052 Fax: (617) 3775040 NULLS ABSTRACT A pattern synthesis method, which incorporates deterministic nulls in the radiative near-field of an array, is presented The problem isformulated as a constrained least-mean-square app

DESIGN AND PERFORMANCE OF CONFORMAL MICROSTRIP PATCH ARRA YS ON CYLINDRICAL SURF ACES F. Rostan, G. Gottwald, W. Wiesbeck Institut flir H~hstfrequenztechnik und Elektronik University of Karlsruhe, Kaiserstr. 12, 76128 Karlsruhe, Germany (Telephone: +49721/608-2522 Telefax:+49721/691865) ABSTRACT Conformal microstrip patch, arrays are used in many applications for mobile communications pertaining t