Is the ground plane of my antenna feasible? What changes should I make to get more accurate results?

Yolanda Gonzalez

Hello, 

I have a model of an inverted f antenna that has a ground plane with a distance of 9um from the circuit. I have attached the model for review. When simulating the model, I changed the substrate to an infinite substrate. 

Is the structure/formatting of my ground plane feasible? What changes should I make to my model to simulate more accurate results? 

Thanks, 

Yolanda Gonzalez 

mvogel

This may not be a good model to simulate in Feko with the Method of Moments or with MLFMM.

As a rule of thumb, when you have two metal layers with a certain vertical separation, for accurate results the triangles should not be larger than three to five times the separation. In your case, following that rule of thumb would give you many triangles; maybe too many to simulate efficiently.

As for the infinite substrate (good idea in principle), when the layer is extremely thin relative to the wavelength, the calculations lose accuracy. "Extremely thin" may be 1/1000 of the wavelength or less; I'm not sure. If I'm correct about this, then a substrate much less than 0.3 mm (300 um) would not be good to represent by an infinite substrate at 1 GHz.

The use of the finite-difference time-domain method results in too many voxels.

You might have a chance with the finite-element method; I did not try that.