Circulator

Model ideal frequency-independent circulators with S-parameters

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库:
RF Blockset / Circuit Envelope / Junctions

Description

Use theCirculatorblock 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. TheCirculatorblock can circulate the signal in clockwise or counterclockwise direction depending on the parameter selection.

Parameters

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`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 isCirculator clockwise. The s-parameter matrix forCirculator clockwiseis:
$[\begin{matrix} 0 & 0 & 1 \\ 1 & 0 & 0 \\ 0 & 1 & 0 \end{matrix}]$
Circulator counter clockwise
的参数矩阵Circulator counter clockwiseis:
$[\begin{matrix} 0 & 1 & 0 \\ 0 & 0 & 1 \\ 1 & 0 & 0 \end{matrix}]$
Tee H-plane (S11=0)
的参数矩阵Tee H-plane (S11=0)is:
$(\begin{matrix} 0 & 1 & 0 \\ 1 & 0 & 0 \\ 0 & 0 & 1 \end{matrix})$
Reciprocal phase shifter
的参数矩阵Reciprocal phase shifteris:
$(\begin{matrix} 0 & p h a s e_{12} & 0 \\ p h a s e_{12} & 0 & 0 \\ 0 & 0 & p h a s e_{33} \end{matrix}) (\frac{- j}{\sqrt{2}})$

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

Reference impedance of circulator, specified as a scalar or 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

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.

Model Examples

100 Watt TR Module for S-Band Applications

Use the RF Blockset™ Circuit Envelope library to simulate a 100 Watt transmit and receive (TR) module. Three TR switches provide isolation between the transmitter and receiver and share a common path and components between both chains. You simulate the output power of transmit and receive chains and derive the achieved isolation.

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Introduced in R2014a

Circulator

Description

Parameters

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

Reference impedances (Ohm)— Reference impedance of circulator50(default) | positive scalar | three-tuple vector

Phase shift, ports 1 and 2 (rad)— Angle to shift phase of signal in port 1 and port 20(default) | positive scalar

Phase shift, ports 3 (rad)— Angle to shift phase of signal in port 30(default) | positive scalar

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