# October 1992, Volume 1, Number 1

**J. Machac**
[full-text]

A New Version of the Microstrip to Waveguide Transition

A new version of the microstrip-to-waveguide transition is described and analyzed. It is the E-plane transition, where the stripe probe is substituted by a rectangular patch. The structure is very simple, easily adjustable, it has a broad band and there is no need to use an impedance transformer. This transition has been analyzed using the method of minimal autonomous blocks and the integral equation method. The obtained results were compared with experimental data. The agreement is good.

**V. Bilik**
[full-text]

Calibrating the Six-Port Reflectometer Using a Matched Load And Four Unity-Reflection Standards (Part 1)

An alternative six-port calibration procedure is described using an ideal matched load and four unity reflection standards. Not only offset short or open circuits can be used as the reflection standards but also arbitrary reactances, such as inductors or capacitors. A different mathematical approach is employed to obtain the calibration equations.

**T.Dostal, J.Mikula**
[full-text]

Signal-Flow Graph Network Analysis

A novel type of signal-flow graph is presented creating minimum number of nodes for independent voltages only. The graph will be derived by inspection of the network using special transforming T-graphs. The method is useful for the analysis of medium-size active and switched networks.

**J. Turan**
[full-text]

An Acoustic Object Recognition System

This paper presents the results of a study on use rapid transform to analysis of acoustic echo signals in an acoustic object recognition system. The echo signals are analysed in the time invariant rapid transform domain and compared with reference patterns stored in memory. The application of fast shift invariant rapid transform in signal classification increases the capability of the system to distinguish and identify different objects.

**D. Biolek**
[full-text]

Multi-Step Numerical Laplace Inversion

An accurate numerical Laplace inversion algorithm is presented. In comparison with original multi-step inversion method, some improvements are made. The concrete Turbo Pascal routines are introduced.