Error while trying to simulate slot antenna on infinte ground plane with CMA method

Boxi

Hello, 

I am trying to simulate slot antenna in an infinite ground plane through characteristic mode analysis in FeKO 2025. The design contains 4 slots on infinite ground plane under the condition of multilayer planar substrate.

I set the slot with the "Planar Grenn's function aperture" solution method. In the user guide, it shows that the CMA can be used in aforementioned model, however, it shows the following error "Only MoM solution methods are supported in Characteristic modes".

The thing I can not understand is although there is an error the simulation is finished, however, when I check the results, I can not find anything.

I really need some advice to solve this problem.

Attached is my design.

slot on infinte GND.cfx

Any help will be highly appreciated.

Thanks 

Shannon_Mistry

Hi @Boxi,

Thank you for sharing the details and the screenshots.

I will look further into the error message in CADFEKO related to not being able to use CMA with Planar Green's Function.

Regarding the message in POSTFEKO, this typically happens in Characteristic Mode Analysis when only a few modes are requested. In that case, the "Mode 1" you try to plot may not exist at every frequency, or it may represent a different physical mode at different frequencies.

To resolve this, request for more modes in CADFEKO. You can use the Macro in POSTFEKO to plot the modes.:

I increased the requested modes and plotted them in POSTFEKO as below for the model you shared:

R