Need help in design of Ultrawide band antenna using IE3D.

I find it difficult to design UWB antenna in IE3D having finite ground plane.
Can someone please help me by telling which type of ports to be used for the microstrip feed with finite ground plane and how to make a finite ground plane as in IE3D, by default, the ground plane is infinite and so is there a chance to edit its properties and make it finite?

Waiting 4 reply....

Hello,

Maybe you found the solution already.

You have to make the layer 0 conductivity zero, this removes the infinite ground. All ground you will draw after that will be meshed an treated as any other metallic structure that you put into your design.

you can (as far as I know) only use the localized feed schemes (horizontal or vertical localized ports) in case of limited ground.

Note that to have reasonable results from a microstrip over a limited ground, you should align the segments in the strip with the segments in the groundplane under it. The reason for that is when you draw a microstrip of about 3mm wide over a limited ground plane, the ground plane under the microstrip is mostly meshed with far bigger segments. Because of these big segments, the simulator cannot calculate the steep current density variations that you have in a ground plane under a microstrip.

Other option is to leave the finite ground, but remove lots of it by drawing planes. As you know drawing planes in an infinite ground, is like cutting planes out of the infinite ground.

By doing this, you can still use the feeding schemes for infinite ground. The disadvantage of this is that because of this ground plane, you will get a distorted radiation pattern as, for example, horizontally polarized waves do not propagate along a infinite ground plane.