# Creating the Model

Create the model in CADFEKO. Define any ports and sources required for the model. Specify the operating frequency or frequency range for the model.

1. Define the following variables:
• freq = 30e6 (The operating frequency.)
• lambda = c0/freq (The wavelength in free space.)
• rBig = 1 (Radius of revolution.)
• rSmall = 0.1 (The pipe radius.)