MATLAB: How to cascade N-port S-parameters using the RF Toolbox

Question

I have a .s3p file with 3-port S-parameters that I would like to cascade into a network with 2-port S-parameters. I am unable to figure out how to put them together in the RF Toolbox.

Answer 1

This enhancement has been incorporated in Release 2007b (R2007b). For previous product releases, read below for any possible workarounds:

The ability to cascade N-port S-parameters is not available in RF Toolbox. RF Toolbox only supports cascading of two port networks only.

However, RF Toolbox does allow reading and writing of N-port data files, but any analysis routines of this data must be provided by the user.

The following is an example of writing and reading N-port S-parameter files.

nports=42;
h=rfckt.passive
h.NetworkData.Freq = [1;2]*1e9
h.NetworkData.Data = cat(3,rand(nports,nports)+j*rand(nports,nports),rand(nports,nports)+j*rand(nports,nports))
analyze(h,h.NetworkData.Freq)
write(h,['test.s' num2str(nports) 'p'])
h2=read(rfckt.passive, ['test.s' num2str(nports) 'p'])