Calculating S-parameters of a waveguide using mode matching

[adel_48]

Mode Matching Code

Hi,

Does anyone have a code to calculate the s-parameters of a waveguide discontinuity using mode matching.

I have used the following procedure but the solution does not converge:

1. Arrange the modes according to their cutoff.
2. Use certain number of modes in one of the waveguides then find the required number of modes in the second using a convergence technique (e.g. their area ratio)
3. calculate the inner & mutual products
4. use the relations between the inner & mutual products and the generalized scatternig matrix to calculate the s-paprameters.

do you think their is something missing in the algorithm or is it just some 'silly' mistake some where in the code.

Thanks in advance.

 

[loucy]

Re: Mode Matching Code

The procedure is sound. But tell us what is the discontinuity?

 

[adel_48]

Re: Mode Matching Code

I am trying to model two types of discontinuities actually a rectangular to circular (which is the main part) and a rectangular to rectangular double step discontinuity.

But any code will be helpful.