How can I add lumped elements in IE3D

add lumped element in zeland

I can add lumped elements between two ports,but in many cases there cannot define two ports such as in dipole.
Thx!

If your structure is a differential feed like a dipole, you can define a differential port on it. After simulaiton, the s-parameters is represented as 1-terminal at the port. If you want to put a 2-terminal lumped element across the differential port on IE3D's MODUA simulator, you can put a CONNECTION to connect the only terminal at the port of the dipole to the 1st terminal of the lumped element. Then, you connect tehr 2nd terminal with a SHORT. It looks like this:

[1]---other port for feed----[sp]----port for dipole----o------||----o----[short]

You will get the correct results from MODUA. This scheme is discussed in the IE3D mannual. You can also perform mixed EM (on .geo modules) and circuit simulations (on lumped elements and s-parameters) on IE3D in this way. The topology looks strange. However, please consider the SHORT as the return path for the connection. It means that the lumped element (the cap) with one terminal connected to one terminal of the dipole, and the 2nd terminal connected to the return path of the dipole port.

thank you for advise.
I do surprise by the speed of ie3d and i can get precise solution in most times.But in some stacked configuration it didnot agree well with the measurement. Does ie3d use DCIM and make biggish apporximations to solve green function?
BTW,sometimes i will get dB_S11 large than 0,here is an example(when f=2.895Ghz). Can you explain it?
regards!

IE3D should be quite stable. It is considered as tbe most accurate and flexible EM simulator for many things. However, it may yield un-physical results if it is not setup properly. Most of the problems are in setting up the ports and this is common for all EM simulators, because ports do have some requirements. Thanks!

can u give me the print screen shots for adding a lumped elements in IE3D..... it will be great thank full if u send the print screen for procedure .