EFFICIENT COMPUTATION OF BOUNDARY VALUE PROBLEMS USING CONFORMAL TRANSFORMATIONS COMBINED WITH NUMERICAL TECHNIQUES Ralph Levy* ABSTRACT This paper describes a new approach to the solution of two-dimensional boundary value problems which eliminates the disadvantages and combines the advantages of both conformal transformations and numerical methods. The conformal transformations are used to rem

THE ANALYSIS A.F.Bur§uk t OF COMB-LINE STRUCTURES BY ELECTROMAGNETIC FIELD THEORY Abstract: The paper examines the propagation characteristics of TEM coupledbar structures in waveguide or between ground planes. For meeting the boundary conditions, the structure is divided into three sub-regions, for each of which solutions of Maxwell's equations are obtained. To find the frequencies of pass-b

RECTANGULAR WAVEGUIDESOF THE "HOLLOWDIELECTRIC CANAL" CLASS Yu.N. Kazantsev, O.A. Kharlashkin ABSTRACT. This paper describes a number of oversized rectangular waveguides with impedance walls, so-called "the hollow dielectric canal waveguides" (EDC-waveguides). Attenuation in HDC-waveguides reduces with decreasing the wavelength, that makes it possible to use these waveguides in millimetre, sub

BROADBAND PHASE TRANSFORMER MODULATORWITH A BRANCH LINE COUPLER - Jan Komisarczuk . ABSTRACT. The paper presents a way and results of the computer aided optimization of the phase modulators to attain almost flat phase shift about the centre frequency. the modulator consists of the branch line coupler-transformer and of PIN diodes. There are many parameters of the circuit namely structure and



THE CANONICAL COUP):.ER : A NEW APPROACH TO MICROWAVE COUPLER DESIGN. P.R. Rigg and J.E. Carroll. ABSTRACT. Mutually coupled transmission lines are described by inductance and capacitance matrices. Such a system can be reduced to a canonical matrix form which provides the basis for a new design technique. Expressions are given for the scattering parameters in terms of the line parameters ena

SYNTHESIS OF BROADBAND SYMMETRIC BINARY POWER DIVIDERS L. Nystrom ABSTRACT paper describes the synthesis of broadband symmetric binary power dividing trees. The synthesis is made with the even and odd modes. The different modes are optimized together with the isolating resistances as variables. The synthesis is done by a minimization of the absolute value of the reflection coefficient for

EXACT DESIGN OF THE MARCHAND BALUN J.R. CLOETE* ABSTRACT Exact methods for the synthesis of commensurate length distributed networks are used to compute the circuit element values of three implementations of the Marchand balun. One of these is a new implementation which incorporates a quarter-wave line at both the balanced and unbalanced ports. As a result, the practical operating range of t

A LOW-COST APPLICATIONS Bengt CONTINUOUS L-BAND PHASE SHIFTER/ATTENUATOR FOR LOW POWER U1riksson ABSTRACT A simple continuous phase shifter and attenuator module for L-band applications is presented. The phase shift and the attenuation can be continuously varied over 360° and 20 dB, respectively. The phase shifter is a hybrid unit, consisting of a 180° discrete PIN diode phase shifter and a

RECENT ADVANCES IN BEAM LEAD DIODE MIXERS FOR MILLI~lliTER SYSTEMS APPLICATIONS APOSTLE G. CARDIASMENOS ABSTRACT This paper describes ongoing development of suspended strip1ine mixers at 30, 35, 40-50, 60, 94 and 140 GHz. These mixers, exhibiting the lowest commercially available noise figures, have been designed specifically for millimeter wave systems requirements. They utilize advanced beam le