# Problem with using periodic simulation in CST Microwave Studio

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#### R90

##### Newbie level 3
Good Morning ..
I Was Facing A Problem That I Wanted To Simulate A Part Of The Structure (Leaky Wave Antenna) Using The Periodic Simulation (Periodic Boundary Conditions)
So I Would Like To Know The Specifications Which Should Be Applied For This Simulation To Run Successfully .. Note That I Have Tried It Once But It Gave Me Out Wrong Results
And Some Doctors Told Me That The Problem Is With The Boundaries That It Must Be The Same Size As The Structure Itself .. I Tried Doing This But It Gave Me Out A Warning
Telling Me That The Ports Shouldn't Touch The Boundary Box.
Best Regards ..
Thank You !

#### letsgo_buffalo

##### Newbie level 2
If you are using CST there is a boundary condition for periodicity. as long as you have your frequency range setup it should automatically size the boundary box.

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