AddDjordjevicSarkarMaterial
===========================
```{function}  AddDjordjevicSarkarMaterial(CSX, matName, varargin)
```
Full definition:
```{code-block} matlab
function [CSX] = AddDjordjevicSarkarMaterial(CSX, matName, varargin)
```

Add a wideband dielectric material to a CSX struct using a multi-term
Debye fit of the Djordjevic–Sarkar model.

Calculates Debye parameters from a single (eps_r, tanD) measurement via
`calcDjordjevicSarkarApprox` and adds the material to the CSX struct.

- CSX          : CSX struct to which the material will be added
- matName      : String name of the material

required name-value pairs:
- 'fMeas'     : Measurement frequency [Hz]
- 'epsRMeas'  : Relative permittivity ε_r at 'fMeas'
- 'tandMeas'  : Loss tangent tan(δ) at 'fMeas'
- 'f2'        : Upper corner frequency of the Djordjevic–Sarkar model [Hz]

optional name-value pairs:
- 'lowFreqEvalType': Low-frequency behavior:
                     0 = use 'f1' (default), typical Djordjevic–Sarkar
                     1 = use 'epsRdc'
- 'f1'             : Lower corner frequency [Hz] (used if `lowFreqEvalType` = 0)
- 'epsRdc'         : Permittivity at DC (used if `lowFreqEvalType` = 1)
- 'sigmaDC'        : DC conductivity [S/m]
- 'nTermsPerDec'   : Number of Debye terms per frequency decade
- 'plotEn'         : Enable/Disable plots of the model

output:
- CSX : Updated CSX struct including the defined wideband dielectric material

note:
- Internally uses `calcDjordjevicSarkarApprox` to generate model parameters.
- See `calcDjordjevicSarkarApprox` for detailed description of the model
  fitting.

example:

    CSX = AddDjordjevicSarkarMaterial(CSX, 'MyMaterial', ...
        'fMeas', 1e9, 'epsRMeas', 4.2, 'tandMeas', 0.02, ...
        'f1', 1e6, 'f2', 200e9);

See also: calcDjordjevicSarkarApprox, AddDebyeMaterial

Version History:
v1.0  2025-06-30  Tobias Ammann  Initial version