Circulator

Model ideal frequency-independent circulators with S-parameters

Libraries:
RF Blockset / Circuit Envelope / Junctions

Description

Use the Circulator block to model ideal passive three-port circulators in a circuit envelope environment. Circulators are used to control signal direction and flow inside an RF circuit. The Circulator block can circulate the signal in clockwise or counterclockwise direction depending on the parameter selection.

Examples

100 Watt TR Module for S-Band Applications

Simulate a 100 Watt transmit and receive (TR) module.

Open Script

Parameters

expand all

Select component — Circulator direction
`Circulator clockwise` (default) | `Circulator counter clockwise` | `Tee H-plane (S11=0)` | `Reciprocal phase shifter`

Circulator direction, specified as:

Circulator clockwise
The default option is Circulator clockwise. The s-parameter matrix for Circulator clockwise is:
$[\begin{matrix} 0 & 0 & 1 \\ 1 & 0 & 0 \\ 0 & 1 & 0 \end{matrix}]$
Circulator counter clockwise
The s-parameter matrix for Circulator counter clockwise is:
$[\begin{matrix} 0 & 1 & 0 \\ 0 & 0 & 1 \\ 1 & 0 & 0 \end{matrix}]$
Tee H-plane (S11=0)
The s-parameter matrix for Tee H-plane (S11=0) is:
$(\begin{matrix} 0 & 1 & 0 \\ 1 & 0 & 0 \\ 0 & 0 & 1 \end{matrix})$
Reciprocal phase shifter
The s-parameter matrix for Reciprocal phase shifter is:
$(\begin{matrix} 0 & p h a s e_{12} & 0 \\ p h a s e_{12} & 0 & 0 \\ 0 & 0 & p h a s e_{33} \end{matrix}) (\frac{- j}{\sqrt{2}})$

Reference impedances (Ohm) — Reference impedance of circulator
`50` (default) | positive scalar | three-tuple vector

Reference impedance of circulator, specified as a positive scalar or three-tuple vector.

Note

When the reference impedances of all the ports are not equal, the model inside the Circulator block is normalized to 50 ohms.

Phase shift, ports 1 and 2 (rad) — Angle to shift phase of signal in port 1 and port 2
`0` (default) | positive scalar

Angle to shift the phase of the signal in port 1 and port 2, specified as a positive scalar in radians.

Phase shift, ports 3 (rad) — Angle to shift phase of signal in port 3
`0` (default) | positive scalar

Angle to shift the phase of the signal in port 3, specified as a positive scalar in radians.

Ground and hide negative terminals — Ground RF circuit terminals
`on` (default) | `off`

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

By default, this option is selected.

Version History

Introduced in R2014a

Circulator

Description

Examples

100 Watt TR Module for S-Band Applications

Parameters

Select component — Circulator direction Circulator clockwise (default) | Circulator counter clockwise | Tee H-plane (S11=0) | Reciprocal phase shifter

Reference impedances (Ohm) — Reference impedance of circulator 50 (default) | positive scalar | three-tuple vector

Phase shift, ports 1 and 2 (rad) — Angle to shift phase of signal in port 1 and port 2 0 (default) | positive scalar

Phase shift, ports 3 (rad) — Angle to shift phase of signal in port 3 0 (default) | positive scalar