Create and Import Circuits

Circuits in the RF Design and Analysis App

In this app, you can create circuits that include RF components and RF networks. Networks can contain both components and other networks.

Note

In the circuit object command line interface, you create networks by building components and then connecting them together to form a network. In contrast, you build networks in the app by creating a network and then populating it with components.

Create RF Components

This section contains the following topics:

• Available RF Components

• Start the RF Design and Analysis App

• Add an RF Component to a Session

Available RF Components

The following table lists the RF components you can create using the app and the corresponding RF Toolbox™ object.

RF Component	Corresponding RF Object
Data File	rfckt.datafile
Delay Line	rfckt.delay
Coaxial Transmission Line	rfckt.coaxial
Coplanar Waveguide Transmission Line	rfckt.cpw
Microstrip Transmission Line	rfckt.mixer
Parallel-Plate Transmission Line	rfckt.parallelplate
Transmission Line	rfckt.txline
Two-Wire Transmission Line	rfckt.twowire
Series RLC	rfckt.seriesrlc
Shunt RLC	rfckt.shuntrlc
LC Bandpass Pi	rfckt.lcbandpasspi
LC Bandpass Tee	rfckt.lcbandpasstee
LC Bandstop Pi	rfckt.lcbandstoppi
LC Bandstop Tee	rfckt.lcbandstoptee
LC Highpass Pi	rfckt.lchighpasspi
LC Highpass Tee	rfckt.lchighpasstee
LC Lowpass Pi	rfckt.lclowpasspi
LC Lowpass Tee	rfckt.lclowpasspi

Start the RF Design and Analysis App

Type the following command at the MATLAB^® prompt to open the app window:

rftool

For more information about this user interface, see The RF Design and Analysis Window.

Add an RF Component to a Session

1. In the RF Component List pane, click Add to open the Create Network or Component dialog box.

   

2. In the Create Network or Component dialog box, select Component.

3. In the Component Name field, enter a name for the component. This name is used to identify the component in the RF Component List pane. For example, Microstrip Component.

4. From the Component Type menu, select the type of RF component you want to create. For example, Microstrip Transmission Line.

   

5. Adjust the parameter values as necessary.

   Note

   You can accept the default values for some or all of the parameters and then change them later. For information on modifying the parameter values of an existing component, see Modify Component Data.

6. Click OK.

   The app adds the component to your session.

   

Create RF Networks

You create an RF network using the app by adding a network to the session and then adding components to the network.

This section contains the following topics:

• Available RF Networks

• Add an RF Network to a Session

• Populate an RF Network

• Reorder Circuits Within a Network

Available RF Networks

The following table lists the RF networks you can create using the app.

RF Network	Corresponding RF Toolbox Object
Cascaded Network	rfckt.cascade
Series Connected Network	rfckt.series
Parallel Connected Network	rfckt.parallel
Hybrid Connected Network	rfckt.hybrid
Inverse Hybrid Connected Network	rfckt.hybridg

Add an RF Network to a Session

1. In the RF Component List pane, click Add to open the Create Network or Component dialog box.

   

2. In the Create Network or Component dialog box, select the Network option button.

3. In the Network Name field, enter a name for the component. This name is used to identify the network in the RF Component List pane. For example, Series1.

4. From the Network Type menu, select the type of RF network you want to create. For example, Series Connected Network.

   

5. Click OK.

   The RF Component List pane shows the new network.

   

Populate an RF Network

After you create a network using the app, you must populate it with RF components and networks. You insert a component or network into a network in much the same way you add one to a session.

To populate an RF network:

1. In the RF Component List pane, select the network component you want to modify. Then, in the Component Parameters pane, click Insert.

   

   The Insert Component or Network dialog box appears.

   

2. Click Component or Network in the Insert Component or Network dialog box to add either a component or a network.

   Enter the component or network name, and select the appropriate type. If you are inserting a component, modify the parameter values as necessary. See Add an RF Component to a Session or Add an RF Network to a Session for details.

As you insert components and networks into a network, they are reflected in the RF Component List and Component Parameters panes. The figure below shows an example of a cascaded network that contains two components and a network. The subnetwork, in turn, contains two components.

Reorder Circuits Within a Network

To change the order of the components and networks within a network:

1. In the RF Component List pane, select the network whose circuits you want to reorder.

2. In the Component Parameters pane, select the circuit whose position you want to change.

3. Click Up or Down until the circuit is where you want it.

To reverse the positions of Component1 and Network1 in the network shown in the following figure:

1. Select Network in the RF Component List pane.

2. Select Component1 in the Component Parameters pane.

3. Click Down in the Component Parameters pane.

Import RF Objects into the RF Design and Analysis App

The RF Design and Analysis app lets you import RF objects from your workspace and from files to the top level of your session. You can import the following types of objects:

• Complex component and network objects that you created in your workspace using RF Toolbox objects.

• Components and networks you exported into your workspace from another session.

  For information on exporting components and networks from another session, see Export RF Objects.

After you have imported an object, you can change its name and work with it as you would any other component or network.

This section contains the following topics:

• Import from the Workspace

• Import from a File into a Session

• Import from a File into a Network

Import from the Workspace

To import RF circuit objects from the MATLAB workspace into your session:

1. Select Import From Workspace from the File menu. The Import from Workspace dialog box appears. This dialog box lists the handles of all RF circuit (rfckt) objects in the workspace.

   

2. From the list of RF circuit objects, select the object you want to import, and click OK.

   The object is added to your session with the same name as the object handle. If there is already a circuit by that name, the app appends a numeral, starting with 1, to the new circuit name.

Import from a File into a Session

You can import RF components from the following types of files into the top level of your session:

• S2P

• Y2P

• Z2P

• H2P

To import a component from one of these files:

1. Select Import From File from the File menu. A file browser appears.

2. Select the file type you want to import.

3. Select the name of the file to import from the list of files in the browser.

   

4. Click Open to add the object to your session as a component.

   

   The name of the component is the file name without the extension. If there is already a component by that name, the app appends a numeral, starting with 1, to the new component name. The file name, including the extension, appears as the value of the component's File Name parameter. If the file is not on the MATLAB path, the value of the File Name parameter also contains the file path.

Import from a File into a Network

You can import RF components from the following types of files into a network:

• S2P

• Y2P

• Z2P

• H2P

To import an RF component from a file into a network:

1. Insert a Data File component into the network.

   For more information on how add a component to a network, see Populate an RF Network.

2. Specify the name of the file from which to import the component in one of two ways:

   • Select the file name in the file name and type in the Import from File dialog box, and click Open.

   • Click Cancel to get out of the Import from File dialog box, and enter the file name in the Value field across from the File Name parameter in the Insert Component or Network dialog box.

Model an RF Network shows this process.