COMPUTER RESONATOR AIDED DESIGN AND AlIGNMENT Of A TUNABlE lOW NOISE DIELECTRIC OSCIllATOR Norbert Loechel * ABSTRACT The design of a 4 GHz low noise microwave oscillator for use in carrier supplies for high capacity digital radio systems is described. The oscillator is based on planar circuit technology and a high Q dielectric resonator. The structure is well suited for modelling, compu

INJECTION Z.Golubicic* LOCKED DRO SYNCHRONIZED BY MULTITONE SIGNAL ABSTRACT Behaviour of the injection locked dielectrics resonator oscillator (ILDRO) synchronized by the external multitone signal was investigated. Subject of this investigation was the possibility of synchronization many DRO (at different frequencies) symultaneously. Principles of injection locking are also used for decreasing

A FAST NEWTON ALGORITHM FOR THE ANALYSIS AND DESIGN OF MICROWAVE OSCILLATORS AND VCOs Vittorio RIZZOLI (1) and Andrea NERI (2) ABSTRACT The paper introduces a second-generation harmonic-balance algorithm providing a very powerful simulation and design tool for microwave VCOs and oscillators of all kinds. The oscillator tuning characteristic is determined by a fast Newton iteration yielding order-o

STEP RESPONSE AND VERY LARGE-SIGNAL FETS AT PICOSECOND SCALES. MODELING OF A. Ouslimani, G. Vemet and R.Adde ABSTRACT (*) The step response of fast FETs is measured and simulated. A very large signal model is used where non linear parameters are described with 2Dlook-up numerical tables versus device internal voltages. Full dc and microwave FET characterization and high precision parameter ex

MULTI-FREQUENCY ANALYSIS OF NONLINEAR CIRCUITS USING ONE AND TWO- DIMENSIONAL SERIES EXPANSIONS Tapani Nirhi ABSTRACT A new analysis method for nonlinear circuits is presented. By representing nonlinear components with one- or two-dimensional series of orthogonal polynomials, circuits are analyzed solely in frequency domain. Improvement in computing efficiency is such that microwave circuits wit

A NEW APPROACH FEEDBACK TO THE ANALYSIS AND DESIGN OF MICROWAVE OSCILLATORS D. Elad, A. Madjar, A. Bar-Lev * ABSTRACT The direct use of the harmonic balance algorithm in oscillator design encounters several difficulties due to the oscillator being an autonomous system that determines its own frequency, power and harmonic content. The approach presented here analyzes an open loop version. of t

CHAOTIC BEHAVIOUR OF MICROWAVE CIRCUITS M. I. Sobhy, N. A. Butcher and A. A. A. Nasser* ABSTRACT One of the objectives of the paper is to make microwave engineers aware of the phenomenon of chaos and how it can occur in non-linear microwave circuits and systems. The paper explains the basic principles of chaotic behaviour and how to design non-chaotic circuits. Several case studies are presented

INTEGRATED MULTI-CHANNEL MULTI- FREQUENCY MICROSTRIP ANTENNA ARRAY MICHAEL NEGEV *, CLAUDE SAMSON* ABSTRACT This paper describes an integrated, multi-channel, multi-frequency microstrip antenna array confined to a given limited aperture. Integration of several channels has become important in the development of wide scan angle phased-array antennas that operate without the appearance of g

A NEW NE':CHOD }"OH DEEnGN ARRAY PROCESSOR OJ? "JIJ)}~BAND ADAP':CIVE LIU ZHONG AND GONG YAO-HUAN* _'\.BS'I'RACT This paper presents a new method for the design of wideband array processors based on Semi-Infinite Quadratic Optimization techniques. The method is to minimize array output power subject to linear functional inequatity constraints, which takes the frequency bandwidth into acco

MICROSTRIP PATCH ARRAY WITH MULTIPLE BEAMS P.S. Hall* and S.J. Vetterlein* ABSTRACT A novel multiple beam microstrip patch array is presented that combines the function of a beamformer and an array into one structure that gives a one dimensional beam set. The array comprises a set of series resonant patch arrays that are excited by a number of travelling wave feed lines. The beam directio