Dual Manifold Synchronously Abstract feed High Power Multiplexers Tunable, Channels. Prof. J.D. Rhodes OBE F.Eng. with Interacting, Design techniques exist for fixed tuned interacting channel multiplexers with direct or manifold feeds e.g. [1,2]. With the growth of cellular communications the need has arisen for frequency plans to be modified continually to accommodate growth and daily demand

A LOW INTERMODULATION DIRECTIONAL COUPLER AND LOG AMPLIFIER FOR HIGH POWER VSWR MEASUREMENT Christopher Abstract There is a clear requirement for the measurement of feeder I. Mobbs1 and antenna VSWR in all high power and high integrity communication systems. Most base stations for new cellular (8SM, PCN etc) systems have such measurement systems. The new digital modulation schemes make these meas

RADIOWAVE PROPAGATION IN OFFICE BUILDINGS AND UNDERGROUND HALLS Jaakko Lahteenmaki * ABSTRACT Radiowave propagation measurements at 1.7 GHz for indoor mobile systems are described. A coherent pulse measurement is used to measure path loss and complex power delay profile of the radio channel. The results show that path loss and delay spread are highly dependent on building architecture and material

A FREQUENCY SCANNING COMMUNICATIONS CONCEPT FOR AERONAUTICAL SATELLITE K. Markus*, A. Roederer*, M. Shelley**, D. Brain** ABSTRACT A frequency scanning satellite payload concept for aeronautical passenger communication at Ka-band is presented. Aeronautical passenger communications services via satellite at Kaband have been frequently considered, but no practical system has yet been implement

Satellite I PCN Compatibility for Worldwide Mobility based on Resonant Sun - Synchronous Orbits Cionaith J. Cullen\ R. Thfazolli'. Prof. B.G. Evansl Abstract This paper reviews some basic equations of motion and coverage of satellites in earth orbit as well as examining satellite constellation design techniques. Specific orbit properties are highlighted and their applicability to constellation de

LIBRARY OF PARASITIC ELEMENTS MODELS FOR MMICs and MHMICs N. Hassame, R. Mezui-Mintsa, A. Boudiaf, A. Konczykowska and H. Wang ABSTRACT A simple method based on the partial element equivalent circuit theory (PEEC) has been established to estimate the inductance coefficients of short links (gold wire, ribbons connections and vias). Interconnection structures are decomposed into segments, which ar

ON THE ASPECTS OF SELECTING THE SYMMETRICALC ONDENSED NODE OR THE EXPANDED NODE MODELLING FOR ELECTROMAGNETIC SIMULATIONS . . M.Celuch-Marcysiak , W.K.Gwarek ABSTRACT: In view of recent research showing equivalence between various versions of the FD-TD and TLM methods we propose that comparative studies of time domain methods be now directed towards distinguishing Expanded Node modelling and Symm

SYSTEM IDENTIFICATION OF (M)MIC-COMPONENTS METHOD FOR TRANSIENT ANALYSIS USING TIME ITERATIVE METHODS W. Kuempel and I. Wolff ABSTRACT This paper presents a technique for considerably reducing the required time steps of time-domain field simulations using modern digital signal processing techniques. The procedure leads to a simple model of the investigated structure in form of a digital filter

A 1.5 GBaud/sec Serial Richard C. Walkert, Link Monolithic Jieh Tsorng Wut Chip Set Benny Lai*, Cheryl Stoutt, Abstract A 1.5 GBaud/s serial data link comprised of a 2-chip set capable of transporting up to 21 parallel bits was successfully fabricated using a 25 GHz peak ft silicon bipolar process. This link features a new encoding scheme which allows DC balance in the serial stream, as wel

A COMPARISON BETWEEN THREE GaAs MONOLITHIC TRANS IMPEDANCE AMPLIFIERS FOR OPTICAL COMMUNICATION SYSTEMS J.A. Casao, P. Dorta, J.L. Caceres, M. Salazar-Palma, J. Perez (*) G. Orengo, C. Paoloni, F. Giannini (**) ABSTRACT Three different GaAs Monolithic Transimpedance Amplifier topologies for low noise and high speed optical communication systems are compared. The first one consists of a simple ca