Help! AIR BOX size in HFSS ?

[jadanz]

I can't find out the proper size of the air box in HFSS, cuz the result shows a quiet

big difference btw HFSS and sonnet. how to define the air box size?

i think the length more than wavelenght/4 doesn't work..it's troubling me to

define the air box in HFSS. Any expert can help? thx a lot !!!

And the file is attached in below.

 

[hamidmoghaddas]

hi
if simulating a planar structure, just the hight of air on substrate should be 10*h
(h: substrate thickness)
air box should completely contain all elements.
GOODLUCK

 

[dingjingfeng]

can you describe the difference between the Sonnet and HFSS with different size of air box?
if you calculate it as an inductor
I guess you result changes a little with different air box,and the inductane and Q of hfss is larger than Sonnet,right?

 

[hf1357]

hi
I sure the airbox size have large effect on return loss but a little effect on radation pattern.

 

[nicetapo]

Does the airbox around the structure have to be defined as radiation boundary? Or, shall I just select the faces of the airbox and define them to be radiation boundaries? I'm currently simulating microstrip lines.

 

[savedadogs]

Your answers are here

https://www.emtalk.com/tut_1.htm