# Circulator

Model ideal frequency-independent circulators with S-parameters

Junctions

## Description

Use the Circulator block to model ideal passive three-port circulators in a circuit envelope environment.

## Dialog Box and Parameters

### Main Tab

Select component
• `Circulator clockwise`

The default option is `Circulator clockwise`. The s-parameter matrix for `Circulator clockwise` is:

$\left[\begin{array}{ccc}0& 0& 1\\ 1& 0& 0\\ 0& 1& 0\end{array}\right]$

When you select this option, the following parameter is available:

• Reference impedances (Ohm)

Specify the reference impedances of `Circulator clockwise` as a scalar or three-tuple. The default values are `50 Ohms`.

• `Circulator counter clockwise`

The s-parameter matrix for `Circulator counter clockwise` is:

$\left[\begin{array}{ccc}0& 1& 0\\ 0& 0& 1\\ 1& 0& 0\end{array}\right]$

When you select this option, the following parameter is available:

• Reference impedances (Ohm)

Specify the reference impedances of ```Circulator counter clockwise``` as a scalar or three-tuple. The default values are `50 Ohms`.

Ground and hide negative terminals

Select this option to internally ground and hide the negative terminals. Clear the option to expose the negative terminals. By exposing these terminals, you can connect them to other parts of your model.

By default, this option is selected.