Why is the radiation pattern not oriented to the 0 degree?

[imtiaz369]

Why is the radiation pattern not oriented to the 0 degree? I got this raditaion pattern after simulation, but I wonder to know that why is the radiation pattern not oriented to the 0 degree instead of 90 dgree?

 

[volker@muehlhaus]

The 0° in your diagram corresponds to z-axis. It seems that your antenna is oriented differently in xyz axis.

 

[imtiaz369]

It is the xyz plane of my antenna. Could you please help me to fix it??

And, is my radiation pattern is wrong??

 

[imtiaz369]

Could you please help me, how I should explain this radiation pattern? where is the θ & Φ?

And, this radiation pattern is oriented toward 90 degrees, how can I change it to 0 degrees?



I've also attached my antenna coordinates here!

 

[volker@muehlhaus]

where is the θ & Φ?

You can find the orientation of theta and phi in the xyz axis here (and hopefully in HFSS manual):

https://de.mathworks.com/help/examples/phased/win64/xxLobes.phitheta_hfss.png

Your antenna has main beam at theta=90° and phi=0°, that is in the xy plane (PCB plane) and not upwards in z direction. No problem with that, if you show the antenna and related xyz coordinate system.

If you insist to "fix" this and get main beam at theta=0°: You could rotate the complete model so that the antenna radiates to z axis, but there might be easier solutions. My EM solver (Empire XPU) has a feature to rotate antenna patterns in postprocessing, maybe HFSS has a similar feature.

 

[vfone]

Why you don't rotate the entire physical structure and point the directive pattern to whatever direction you want.

 

[volker@muehlhaus]

Why you don't rotate the entire physical structure and point the directive pattern to whatever direction you want.

This is what I meant by "rotate the complete model so that the antenna radiates to z axis".

I think the problem here was to understand that Theta=0 in the antenna pattern display is fixed (z-axis), no matter where the antenna radiates.