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In this contribution a short review is given on thermal analysis of hybrid circuits using 2‐D, 3‐D and time‐dependent models. It will be shown which models are necessary to be included in a CAD system for hybrid circuit design.

In this paper the temperature distribution in hybrid circuits will be studied in two different ways. First of all the results of numerical simulations obtained with the programs PROMETHEE and HYBRITHERM will be shown. Secondly, experimental temperature plots obtained with infra‐red thermography will be compared with the theoretical results. The influence of the substrate material (epoxy, glass, Al2O3, AlN and BeO) on the temperature distribution will be demonstrated. Various ways of cooling will also be considered. It will be shown that using high quality substrates such as AlN or BeO is not always useful from a thermal point of view.

In this contribution a linear thermal model for hybrid circuits is presented. Both the heat dissipated in screen printed resistors and in mounted components such as transistors and integrated circuits is taken into account.

A review is given of the several heat transfer phenomena occurring in hybrid circuits. Most attention is devoted to the non‐linear properties. Some theoretical simulations and experimental results are discussed.

Computer algebra or symbolic manipulation is nothing else than performing analytical calculations with the help of a computer. This offers the advantage that lengthy and complicated calculations can be carried out without errors in a very short time. Computer algebra techniques have also been applied to solve electrical networks. This offers particular advantages for hybrid circuit design, as will be outlined extensively in this paper.

An analytical theory based on a perturbation approach is presented to model planar resistors with a stochastic edge. The theoretical analysis is confirmed by Monte Carlo simulations.

The purpose of this paper is to develop a capacitor fully integrated into a wearable textile fabric for the application on smart clothing.

A small capacitor with stainless steel yarns as the electrodes and poly-(3,4–ethylenedioxythiophene): polystryrene sulphonate (PEDOT:PSS) as the dielectric material has been made, integrated into a textile fabric. The electric performance of the capacitor was analyzed and compared with other kinds of electric capacitors.

The fabricated small, PEDOT:PSS capacitor could finally power a calculator for 37 s with the energy stored in it.

This finding is of an important significance for a further development on the capacitor with a better performance.

A finite difference method is presented to calculate the potential distribution in a trimmed resistor. The numerical results are used to study the influence of trimming on the power density distribution and the noise performance.

This paper describes a simple test configuration which allows an analytical solution for thermal analysis. Comparison with experimental measurements has been undertaken and complete agreement has been found.

The present paper describes a relaxation technique to calculate the two dimensional temperature distribution of a hybrid circuit made on a ceramic substrate. The method calculates the potential and power density distribution in the resistors before the temperature is evaluated so that special effects due to trimming cuts can be analysed.