THE INMARSAT SECOND GENERATION COMMUNICATIONS PAYLOAD D.K.BANKS, E.GAMBARUTO, B.KRINSKY ABSTRACT This paper considers the design and technology of the communications payload, its requirements and some measured performances. The paper also outlines the essentials of the INMARSAT system and the types of services that will be provided using the second generation satellites. 

VERY SMALL APERTURE RECEIVE C-'BAND MOBILE Tfi:RMINAL Ali E. Atia*, Paul Ebert*, and Victor Schendeler* ABSTRACT The design and performance (with emphasis on the RF section) of a Mobile Communications Receiver, capable of receiving data at a rate of 1200 bits per second directly from a standard C-Band. Satellite (4 GHz) are described. The Bit Error Rate of this receiver is better than 10-

FREQUENCY-DEPENDENT CHARACTERISTICS OF AN ASYMMETRIC SUSPENDED STRIPLINE AND ITS OPEN END DISCONTINUITY FOR MILLIMETER WAVE APPLICATIONS J ACHKAR*, 0 PICON*, V FOUAD HANNA*, J CITERNE** ABSTRACT The dominant and higher order modes in an asymmetric suspended stripline (ASSL) are accurately described from a thorough spectral-domain approach. Then, using the modal analysis, coupling coefficients betw

EFFECTS OF ASYMMETRY IN SHIELDED MICROSTRIP TRANSMISSION LINES 1 12 K D Dumbell, S R Pennock, T E Rozzi' . ABSTRACT The modes of a shielded microstrip transmission line are determined by a variational method which is also suitable for the analysis of multiple strips and lines embedded in multiple dielectric layers. For the case of an asymmetric strip the modes are compared with experimental

CONDUCTOR LOSS CALCULATION OF SUPERCONDUCTING LOSS EQUIVALENCE MICROSTRIP METHOD LINE USING A PHENOMENOLOGICAL Hai- Young Lee, Keon-Shik Kong and Tatsuo Itoh * Absttact A new approach is presented to calculate the conductor loss of the microstrip line with a superconductor. In this method, two-fluid model for a superconductor is combined with the phenomenological loss equivalence method. Th

A NOVEL APPLICATION SPACE-SPECTRAL DOMAIN TO THREE-DIMENSIONAL APPROACH MICjMMIC AND ITS CIRCUITS University Ke Wu and Ruediger Vahldieck Department of Electrical and Computer Engineering of Victoria, P.O. Box 1700, Victoria, B.C. Canada V8W 2Y2 Abstract A novel Space-Spectral Domain Approach (SSDA) has been developed to ana.lyze spatial three-dimensional discontinuity problems in MIC /MMI

ANALYSIS OF MULTILAYER IRREGULAR William P. Harokopus, Jr., Pisti B. Katehi* MICROSTRIP DISCONTINUITIES ABSTRACT A full-electromagnetic analysis of open microstrip discontinuities on layered dielectric substrates is presented. The space domain method of moments formulation accounts fully for all electromagnetic coupling, and space and surface wave radiation. This versatile formulation has the p

A BROADBAND SINGLE-SIDEBAND B.J. CLIMER MIXER WITH LOW SPURIOUS -- LEVELS ABSTRACT A miniature image rejection mixer has been made which covers It is in suspended microstrip form using quartz substrates local oscillator is applied to a fin-line port resulting in low novel microstrip to fin-line transition is used. the KA Band. for durability. spurious outputs. The A 

GAAS MONOUTIllC BAIANCED MIXER FOR C BAND DIRECf DEMODUIATION RECEIVER I. Telliez, P. Chaumas, C. Rumelhard, G. Pataut ABSTRACf : This paper describes the performances of a GaAs monolithic balanced mixer for C band direct demodulation receiver front-end. Direct demodulation implies design choices, such as the use of Schottky diodes and a 1800 balanced configuration. The coupler used is a monoli

MONOLITIDC GaAs BLANKING UPCONVERTER Kumar Melvin West, Scott Vincelette, Michael Goss and Mahesh ABSTRACT is described to 2.5 GHz. The upconverter consists of a wideband FET double balanced mixer, La and IF input amplifiers, a novel actively matched 1800 phase splitter and an RF amplifier. The upconverter provides a conversion gain of 8 dB, input and output VSWRs of less than 1.6 and a 40 dB