# gammams

Calculate source reflection coefficient of two-port network

## Syntax

``coefficient = gammams(s_params)``
``coefficient = gammams(hs)``

## Description

example

````coefficient = gammams(s_params)` calculates the source reflection coefficient of a two-port network required for simultaneous conjugate match.```
````coefficient = gammams(hs)` calculates the source reflection coefficient of the two-port network represented by the S-parameter object `hs`.```

## Examples

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Calculate the source reflection coefficient using network data from a file.

```ckt = read(rfckt.amplifier,'default.s2p'); s_params = ckt.NetworkData.Data; coefficient = gammams(s_params)```
```coefficient = 191×1 complex -0.7247 + 0.4813i -0.7324 + 0.4723i -0.7401 + 0.4632i -0.7478 + 0.4541i -0.7554 + 0.4449i -0.7630 + 0.4357i -0.7704 + 0.4264i -0.7778 + 0.4170i -0.7850 + 0.4075i -0.7921 + 0.3980i ⋮ ```

## Input Arguments

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Two-port S-parameters, specified as a complex 2-by-2-by-M array. M is the number of two-port S-parameters.

Data Types: `double`

Two-port network, specified as an S-parameter object.

Data Types: `function_handle`

## Output Arguments

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Source reflection coefficient, returned as a M element complex vector.

## Algorithms

The function calculates `coefficient` using the equation

`${\Gamma }_{MS}=\frac{{B}_{1}±\sqrt{{B}_{1}{}^{2}-4|{C}_{1}{}^{2}|}}{2{C}_{1}}$`

where

`$\begin{array}{c}{B}_{1}=1+|{S}_{11}{}^{2}|-|{S}_{22}{}^{2}|-|{\Delta }^{2}|\\ {C}_{1}={S}_{11}-\Delta \cdot {S}_{22}^{*}\\ \Delta ={S}_{11}{S}_{22}-{S}_{12}{S}_{21}\end{array}$`

Introduced before R2006a