how to set the aluminium ground plane in ie3d

hello i want to know that can i set the aluminium plate as ground plane with thickness in ie3d. in a paper which i m considering this is mention "An Aluminum plate with dimensions of 1.397λ0 ×1.257λ0 and thickness of 1 mm is used as the ground plane"
i know how to set the ground plane in ie3d but i dont know how to set this aluminium ground plane.please somebody help me in this

regrads sameer

Hello,

A limited sized ground plane you create as a rectangle, in the same way as another polygon. Make sure that the "layer 0" conductivity is zero. You can set this in the "basic parameters" section. You can change the thickness and conductivity for each metallic layer. When you are done, there will be no horizontal line across the indication for the layer 0.

If you can avoid limited sized ground planes, it is better to do so. An infinite ground plane isn't meshed and polygons (for example microstrips) close to the infinite ground plane will result in good simulation results.

However a limited sized ground plane (in fact just a polygon) has to be meshed as any other polygon. You may know that for conductors close to a ground plane, the return current is strongest right under the conductor (for example microstrip) and reduces rapidly at increasing distance from the conductor. To make sure the simulator will simulate this correctly, the mesh close to the conductor must be detailed enough, while at distance from the trace, the mesh size may be increased.

When you have a trace (or antenna element) at about 0.01*lambda from a meshed ground plane, and use 20 segments/wavelength, it will go wrong. As the segment size will be about 0.05*lambda in the ground plane, the simulation cannot determine the current density change versus distance for the ground plane. Results will be useless. To get useful results, you should use a very fine mesh (< 0.01*lambda, looong simulation run times), or draw the mesh under the trace yourself (this is a time consuming option also, but will give good results) to force small meshing close to the traces that are close to the limited size ground plane.

If you are interested in s-parameters only, and you use traces close to the ground plane, you can use another approach. Set layer zero as a conductor (so infinite groundplane) and cut away sufficient space around the ground plane you want. You may know that drawing polygons in an infinite ground layer is in fact removing metal. This procedure will create an isolated non-meshed ground plane within an infinite ground plane. You get accurate results for S-parameters, with fast run times, but horizontal polarized waves will not propagate along an infinite ground plane. This will result in wrong radiation patterns for antennas that produce horizontal polarized radiation in the XY plane.

Don't make the space around your ground plane too large, as this empty space will be meshed.

I hope this long post will help you somewhat.

hello

i have one request to u
if i send you the .geo file (ie3d) of my designed antenna, can u plz set the meshing frequency and the cells/wavelength bcause i have so much confusion of seting meshing and cell per wavelength.

when i set meshing frequency 3 and cells per wave length 20 then ie3d doesnt simulate the design, it gives some error of "allocating matrix" then i set the cells per wavelentgh 16"

so i want you to plz set the mesing frequency and cell/wave length for me and then me send me the file then i will simulate the design

i will b very thankful to you

regards sameer