# s2s

Convert S-parameters to S-parameters with different impedance

## Syntax

``s_params_new = s2s(s_params,z0)``
``s_params_new = s2s(s_params,z0,z0_new)``

## Description

````s_params_new = s2s(s_params,z0)` converts the scattering parameters with reference impedance `z0` to the scattering parameters with a default reference impedance of 50 ohms. ```

example

````s_params_new = s2s(s_params,z0,z0_new)` converts the scattering parameters with reference impedance `z0` into the scattering parameters with reference impedance `z0_new`.```

## Examples

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Define a matrix of S-parameters.

```s_11 = 0.61*exp(1i*165/180*pi); s_21 = 3.72*exp(1i*59/180*pi); s_12 = 0.05*exp(1i*42/180*pi); s_22 = 0.45*exp(1i*(-48/180)*pi); s_params = [s_11 s_12; s_21 s_22]; z0 = 50; z0_new = 40;```

Convert to S-parameters with different impedance.

`s_params_new = s2s(s_params,z0,z0_new)`
```s_params_new = 2×2 complex -0.5039 + 0.1563i 0.0373 + 0.0349i 1.8929 + 3.2940i 0.4150 - 0.3286i ```

## Input Arguments

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N-port S-Parameters, specified as an N-by-N-by-M array of complex numbers, where M represents the number of frequency points of N-port S-parameters.

Reference impedance of N-port S-parameters, specified in scalar as ohms.

Note

`z0` must be a positive real scalar or vector. If `z0` is a vector, then the vector must be equal to the number of network parameter data points or frequency vector.

Reference impedance of S-parameters, specified in scalar as ohms.

## Output Arguments

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N-port hybrid S-parameters, returned as an N-by-N-by-M array of complex numbers, where M represents the number of frequency points of N-port hybrid S-parameters.

## Alternatives

The `newref` function changes the reference impedance of S-parameters objects.

## References

[1] Reveyrand, T. “Multiport Conversions between S, Z, Y, h, ABCD, and T Parameters.” 2018 International Workshop on Integrated Nonlinear Microwave and Millimetre-Wave Circuits (INMMIC), IEEE, 2018, pp. 1–3. DOI.org (Crossref), doi:10.1109/INMMIC.2018.8430023.

## Version History

Introduced before R2006a