Using MLFMM solver to simulate an array of microstrip patch antennas

AGirlHasNoName

I am trying to simulate a 4x4 array of microstrip patch antennas. First, the simulation was done on an infinite ground plane which resulted in 15.65 dBi of boresight gain. However, on replacing the infinite ground plane with a finite one (and solving the model with MLFMM solver to reduce computation time), the radiation pattern undergoes complete degradation with no mainlobe whatsoever. Why is this happening?

 

The same model has been simulated using other commercially available EM solvers on finite ground planes, and the results obtained are as expected. I am attaching a figure that compares the radiation pattern, of the 4x4 array on finite ground plane in the YZ-plane (phi = 90 deg plane), obtained via different EM solvers. The .cfx files for the 4x4 array are also attached.

 

Thank you in advance.

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Mel

You don't have any metallic (PEC) faces in the model, they are all dielectric surfaces.

 

Have a look at the ExampleGuide models 'Example-A09-Circular_Microstrip_Patch_with_Coupled_Feed' and 'Example-A10-Aperture_Coupled_Patch_Antenna' that will show you how to do this.