IE3D port asignment problem

balaguru thavamani

Hi,

I am trying to set up a problem in IE3D where there is an edge-fed loaded patch antenna. The problem is this: after setting up advanced extension differential port on the microstrip I would like to insert a probe feed to patch, however the program gives me an error: "unable to build the probe-feeds with error code (ic=1)".

This problem only occurs when I use the finite ground plane. In the case of infinite one, everything is fine.

Please help.

Thnx.

ie3d differential ports

hi,
I didnt completely understand your problem.R u trying for dual feed antenna?
can u upload the screen shots of the reference document and your IE3D structure so that i can try to solve your problem.

ie3d ver 11 probe-feed to patch

Hi balaguru thavamani,

Thank you for your response.

Well, it is actually not a dual-feed,.I am loading the antenna with a capacitor. In order to do that, as it's suggested in the manual, I have to EM simulate the structure with two ports and then in MODUA I should "Add Parameter Module", add one cap on to the feed, short it and resimulate, but I can not even set up a probe feed when working with finite ground plane and a differential Advanced Extension port.

I suspect there is some conflict , that I am not aware of, between those two types of ports (Advanced Extension and Vertical Localized (probe feed)).

May be there is some other way to include vertically positioned lumped element in between two layers in the model where finite ground plane is used?

Thanks again.

ie3d port ground reference

Hi,

Both vertical localized and probe feed are of different types.
In such cases u can try one vertical localized port and one probe feed port.
After simulation u can remove probe feed port to add lumped element in modua and then resimulate it in modua.
Still if u find any problem u can send me the structure i'll try to resolve.

ie3d vertival localised

Hi, junta99:

I believe either the "probe-feed to patch" parameters are not correct or you may not define the finite ground plane correctly. You can send your .geo file and tell your "probe-feed to patch" parameters to me (jian@zeland.com) and I can help you. Regards.

port connection in ie3d

Hi jian,

Thank you for your suggestions. I have actually tried to use Zeland's original sample file: "meander4.geo" where ground plane supposed to be well defined. Even with this file the probe-feed to patch can not be added and the following error message comes up: "Some ports are detected to be invalid and they are removed!"

As for defining the probe-feed to patch, it seems to be quite straightforward, I usually accept the default settings for negative and positive levels. I have also have tried all dividing options and several numbers of divisions of a circle. No luck.

I would really appreciate if you could simply test meander4.geo file by adding probe-feed to patch port anywhere between the track and the ground.

Thank you.

Added after 7 minutes:

Hi balaguru thavamani,

I agree with you on the lumped element addition and simulation.

As for vertical localized and probe feed I must disagree. If you build a single probe feed on a finite or an infinite ground plane and then check Port->Ports properties you will see that probe feed is actually vertical localized port.

As for my problem could you please check "meander4.geo" file as described in my previous post. It might be my PC's problem, otherwise seems like an incorrect ports setup or a bug.

Thank you.

define probe feed in ie3d

Instead of differential port u can use vertical localized port by selecting the trace vertices and by following the path Adv edit -> Build via connection on edges.
Probe feed can also be possible.
I've assigned vertical localised port and probe feed to that mentioned example.Find the attached file of the above mentioned configuration.

For proper understanding go through IE3D Manual chapter-7&16.

ie3d port

Hi Guys,

Thanks go to balaguru thavamani for pointing out that vertical localized ports should be used instead of differential advanced extension. Much appreciated.

Went through most of the manual, no mentioning of different port conflicts found. Does it mean that in IE3D the ports in the structure must be of the same type? Or is it just differential advanced Extension port that requires extra care?

ie3d error

junta99 said:

Does it mean that in IE3D the ports in the structure must be of the same type? Or is it just differential advanced Extension port that requires extra care?

Click to expand...

Ports might not be of same type.
Extra care should be taken while assigning differential port.
Find the attached meander_4.geo structure with vertical Localized port and Probe Feed.

automatic port zeland

As it was mentioned earlier probe feed and vertical polarized are ports of the same type:

REF: ie3d_manual, App. I, p.10, quote: "Probe-Feed to Patch: It is an automatic way to build a Vertical Localized port."

My questions are still valid: Does it mean that in IE3D the ports in the structure must be of the same type? Or is it just differential advanced Extension port that requires extra care?

differential extension port

Hi, junta99: It is not necessary to be the same type. For the "invalid port is detected..." after a geometry operation, it is possible that the complicated operation changes the geometryso sigficantly that IE3D/MGRID can not recover the port after the operation. It should not happen much especially in the latest edition. However, such situation can't be completely avoided because polygons and ports are different objects, and port objects are dependent upon polygon objects. When some sophisicated operations are done on polygons objects, it may affect the port objects. The dependency has been well taken care of in IE3D/MGRID while there is still seldom possibility some difficulty is encountered. When such case happen, you just try to re-define the dropped ports. Regards.