Some routines, useful for spreadsheet development, are given next.įor the parameters considered below, the chain is assumed to contain a cascade of devices, which are (nominally) impedance matched. In addition, 'tookits' are available which provide aids to the system designer. Such a chart can be compiled manually : 139 or, more conveniently, by means of a computer program It has the advantage of highlighting key performance figures and also pin-pointing where possible problem areas may occur within the chain, which are not always apparent from a consideration of overall results. ![]() : 663 Scattering parameters avoid the need for ports to be open or short-circuited, which are difficult requirements to achieve at microwave frequencies.Ī system spreadsheet has been a popular way of displaying the important parameters of a chain, in a stage-by-stage manner, for the frequency range of interest. y-parameters or, for high frequency situations, scattering parameters, i.e. : 29 Examples are: impedance parameters, i.e.
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