a question about ie3d

when the source magnitude of a antenna port equals zero, Is it equivalent that the antenna loaded by Zs?

Yes. IE3D allows you to define source magnitnude, phase and termination at each port. Depending upon what values you define, you can get any kind of combinations. This is a more general implementation.

thank you for your reply!
if i had defined the lumped element loads in all antenna ports in modua, then how can i define the plane excitation to run simulation?
thx again.

You can not use MODUA to simulate a structure with planewave excitation. MODUA is a circuit simulator. It can only handle ports and it can not handle planewave excitation. To do what you want, you can define the ports and planewave on the layout editor (MGRID) and simulate it there. Then, you can use the post processor (MGRID in CURIVEW mode) to display the current and near filed and find the radiation pattern with lumped elements connected to the ports. On the latest IE3D, you can even make Tx and Rx antennas so that you can use the Tx antenna to excite the Rx antenna and find the receiving power and waveform on the Rx antenna.

Hi jian

When the modeler of IE3D will be parameterized ?

PL

Hi, Plasma:

The current release of IE3D has two modelers. The MGRID and IE3DLibrary. MGRID is not supposed to be parameterized because it is dealing with low level objects such as veritces and polygons. The IE3DLIBRARY is parameterized completely on version 11. IE3DLibrary is dealing with high level objects such as a T-junction, an edge couled filter etc. The user can associate a dimension of an object with the tuning variables of the whole project. When the tuning variables of the project are changed, the dimensions of all the objects are automatically updated. We have an example of building a LPF with its dimensions completely based upon variables in the IE3D 11 manual. The next IE3Dlibrary will be able to handle hierachy which means that you can define a project and the project can be used as an object of another project.

Hi jian


What I mean that if I choose rectangle. in the dimension box. put letters or names instead of numbers then another dialog box will open to assign the default dimension to it.
Now when I'll open the parameter table I'll have the ability to change the dimension of the rectangle by changing the default dimension. And all the vertex attached to it will move accordingly with the rectangle.

Is it possible to add pull of edge?

PL

Yes. The IE3DLibrary allows you to define tuning variables (TVs). Then, you can define Global Variabels (GVs). A GV can be a formula of TVs. GVs can be seen by any objects. Then, each object has its Local Variabels (LVs). Each LV of an object can can be a formula of the TVs and the GVs and other LVs of the same object, while it can not refer the LVs of other objects. In case, there is any recurrsion happens, the IE3DLirbary will tell the user. Then, you can do a sweep of TVs for EM tuning or use the TVs for optimizaiton variables to control the whole geometry. Such a scheme is implemented into IE3DLibrary since the relesae of IE3D 11. What do you mean pull of edge. Do you mean that you want to select an edge of an object and pull change its locations. This will be a little bit difficult on the IE3DLibrary because it needs to change by parameters. However, it is possible we can implement it. On MGRID, you can grab the vertices of a polygons and drag it to anyway. Anyway, MGRID handles low level objects and it is easy for MGRID. We hope we can combine the two in the future.

Hi jian

Yes. that what I mean. for now I'm using the vertices of a polygons to drag it.

PL

I know. There are differnet levels of objects we need to work on. MGRID of IE3D is dealing vertices and polygons. They are low level objects which are the building blocks of large objects. It is nice MGRID can control the small details. However, as you can see, it is tedious to control many details in one shot. We have to go to the higher level objects and it is where the IE3DLIBRARY comes in. On the IE3DLIBRARY, we describe structures as some basic objects such as a T-junction, a Y-junction with its parameters adjustable by tuning variables. However, it is not easy to change a specific polygon or vertex inside an IE3DLibrary object. Both MGRID and IE3DLIBRARY are useful. We should be able to combine them in a near future. Thanks!

Hi,jian!
Here is another question, how can i conform the via is electrically connected to the infinite ground?
In some case, such as EBG structure, i had to move(or copy) the patch as well as vias frequently, how can i check this connection?
thanks!!

Hi, Wusen:

Please check the VIEW->SHOW GROUND CONNECTION command. It will show you the connection in read color if there is a connection between a via and the ground. Regards,

Hi Jian,

I am following your replies in this forum. I can't stop myself from appreciating you for your prompt replies and great work.

Hats off. Please do continue.

In a single layer structure, i had used the "Adv Edit->Build Hole and vias from Selected Polygons" to build vias between patch and the infinite ground, why did it show no connection?

Hi, Maverick09: Thank you very much for your comments.

Hi, Wusen: The command is for both building holes and vias. If you do not see connection, it may mean that you forgot to check the BUILD VIA CONNECTION option. If you check it, it is supposed to build some vertical polygons between the infinite ground and the patch level. This command has been in MGRID for years and it is quite solid.

Hi jian,
There is only the "Build vias between holes on different layers" check box and i had check it.
I think the answer lies that i also check "Fill the hole" option, when i use "Clear the hole" option instead, i can see the red line which denotes the connection to the infinite ground.

Yes. It is the option. The option allows you the option of filling the built the built hole(s) or leaving the hole(s) as it is. It shouild not affect the connection. You can send me the .geo file(jian@zeland.com).