How do I do a push-pull port?

Geometry Elements - Ports

 Em sums the total current going into all the positive ports with the same port number and sets that equal to the total current going out of all the ports with that same negative port number. Thus the name ”balanced”, or ”push-pull,” port. This type of port is also referred to as an ''odd mode'' port. An example is shown below.

Notice that both ground ports have been labeled ”-1”, while the signal port is labeled ”1”. This represents a balanced port. Any number of ports can have the same positive or negative labels.

For a detailed discussion with more detail on how an odd mode port is modeled in Sonnet, see Using Even and Odd Mode Parameters.

To set up these ports, you would do the following:

1. Select Tools => Add Metalization => Polygon from the project editor main menu and add the metal for the coplanar waveguide short circuit.

     

2. Click on the Add Ports button in the project editor tool box while holding down the shift key. This allows you to add multiple port. Click on the middle digit first so that its port is number 1.



3. Click on port 2, then click on Port 3 while holding down the control key to select both the ports. They are highlighted as a result.

 

4. Select Modify => Port Properties from the project editor main menu. The Port Properties dialog box appears. ''Mixed'' appears in the Port number text entry box.

5. Enter ''-1'' in the Port Number text entry box, then click on the OK button to close the dialog box and apply the new port numbers. Your circuit appears as below.