A general method for deriving Volterra functional description of nonlinear networks is presented. The approach used, based on noncommutative generating power series, differs from the nonlinear transfer function one and leads to a simple generalization of Heaviside's symbolic calculus. Moreover, this method has the advantage of being easily implementable on computers. 



This tutorial paper reviews some fundamental principles in applying the Modal Analysis accompanied by the Spectral Domain Approach to the solution of a broad class of three dimensional uniaxial discontinuity problems. It is shown that this combination offers efficient computation of coupling coefficients between eigenmodes at a discontinuity. A case study of a finline complex discontinuity is pres



This paper describes the use of stationary functionals, written in terms of complex phasor high frequency fields, to set up finite element schemes for solving electromagnetic problems associated with cavities or waveguides loaded with lossy or active material. Attention is focussed upon problems with truly three-dimensional geometry. It is described how scattering parameters of objects within wave

A number of numerical techniques are described for the analysis of passive components. Fundamental concepts and typical applications are presented and discussed. A list of references is included for representative works reported in literature. 

UsinG the specific methods of transient electromagnetic field some new aspects of microstrip antennas are discussed. The transient response, the input impedance, the realizability and the possibility of an equivalent circuit of these antennas are presented. 

Microstrip antennas in a wire grid configuration are investigated. To this end, the current distribution along printed wire antennas can be computed by means of Sommerfeld type integrals, requiring particular analytical and numerical treatment on account of surface wave modes. The results are then generalized to microstrip antennas and compared with those obtained via a time domain analysis. 

Results for a microstrip disc and a new disc and ring element used as reflector feeds are given. The disc and ring feed gives improved performance over the disc having a-24dB cross polarisation level over a 7%bandwidth when used to feed an F/D = 0.3 reflector. Results are comparable to those previously obtained for small microstrip array feeds. 

The design and operation of a measurement system intended for the automatic, on-wafer r.f. characterisation of GaAs monolithic microwave integrated circuits is described. Results are presented for an entire 2 inch wafer of S-band GaAs minutes per chip. ICS which have been measured at a rate of 3~