NUMERICAL EVIDENCE AND TM WAVES FOR HYSTERESIS IN NONLINEAR SLAB-GUIDED TE A. C. P. Zabeu ABSTRACT *, J. R. Souza * By means of finite difference methods, together with variational techniques, solutions are obtained for both TE and TM waves guided by dielectric slabs surrounded by arbitrarily nonlinear material, illustrating the onset of bistability and hysteresis. The method relies on a

A NOVEL FINITE-ELEMENT DIELECTRIC WAVEGUIDES METHOD FOR PROPAGATION ANALYSIS OF OPEN J. Svedin * ABSTRACT A modified finite-element method for propagation analysis of open dielectric waveguides, such as optical fibers and integrated optical waveguides, is presented. The method is based on the full vectorial finite-element fonnulation (Svedin [6]), which has been found to be absent of spurio

NEW DISCRETIZATION METHOD L-MAD AND ITS APPLICATION TO WAVEGUIDE STRUCTURES WITH METALLIC, DIELECTRIC AND FERRITE INSERTS T I Nikolskaya, V V Nikolskii* ABSTRACT A new discretization method L-MAD is developed. Its efficiency is numerically verified. The programs package is made for modeling of waveguide structures including metallic, dielectric and ferrite (gyrotropic) elements. Discontinuities ca

EFFICIENT COMPUTER-AIDED DESIGN OF WIDEBAND STEPPED WAVEGUIDE F. Alessandri, PHASE SHIFTERS M. Mongiardo, G. Schiavon, R. Sorrentino! ABSTRACT An improved mode-matching technique is developed for the efficient CAD of waveguide stepped components. The method is applied to the design of a modified type of phase shifter using both E- and H-plane steps. The latters allow more compact structures

MICROWAVE AND MILLIMETRE-WAVE STARING ARRAY TECHNOLOGY C.J.Alder*, P.R.C.Collins**, J.Warner*, and A.R.Webb*. R.J.Davis*, R.D.Hodges*, L.D.Irving*, ABSTRACT This paper describes a multiple-beam, focal plane array technology which has evolved from microwave lens-fed receiver research, and has been developed to demonstrate a 35 GHz staring array radar. The key features of any sensor which exp

LENS-FED ANTENNAS MICROWAVE AND MILLIMETRE-WAVE RECEIVERS WITH INTEGRAL C.J.Alder, C.R.Brewitt-Taylor, M.Dixon, R.D.Hodges, L.D.Irving, and H.D.Rees * ABSTRACT A family of microwave receivers is described with antenna and semiconductor components integrated on a common substrate, in a space small enough for packing into arrays. The antenna pattern is suitable for feeding via a diel

THE DESIGN OF MILLIMETRE-WAVE LENSES FOR FOCAL PLANE ARRAY RECEIVERS A.P. Wood* and C.A. Leming* ABSTRACT Lens design techniques used routinely in the visible and infrared wavebands have been applied to millimetre-wave lenses used in conjunction with focal plane array technology. A brief description of the lens designers art given and modifications necessary for its implementation at long wav

DIGITAL LOOP-PRESET FREQUENCY SYNTHESIZER Y oshiaki Tarusawa, Yasushi Yamao and Sigeki Saito ABSTRUcr A new high-speed frequency switching PLL synthesizer is presented that employs a digital loop-preset (DLP) technique. Its DLP function is realized by using a digital to analog converter (DAC), an analog to digital converter (AD C) and a resettable prescaler. These rapidly preset the PLL

HEMT Matthias CONTROL CIRCUITS FOR MONOLITHIC loP APPLICATIONS Weiss, Dimitris Pavlidis and Geok Ing Ng ABSTRACT InA1As/lnGaAs HEMT control circuits are studied for monolithic InP applications. Experimental characteristics are presented for bridged-, T- and -topologies. Best performance is obtained for single-cell attenuators. (DC to 26.5 GHz with 30 dB dynamic range and -19 dB return loss

DIGITAL PHASE-SHIFf QUADRATIIRE FRONTEND FOR 1.0- INPlITS UP TO 6 GHz P. Weger 1,2) L. Treitinger 2) K Ehinger 2) E. Bonek 1) ABS TRACf A digital phase-shift quadrature been built with Si-bipolar circuits. this technology is presented. frontend operating up to Experimental results are 6 GHz LO-frequencies given and the potential has for