emchild
Newbie level 1
I am having problems simulating an antenna that radiates into a lossy medium in HFSS. The antenna is a microstrip patch antenna. I am using HFSS to simulate the performance of the antenna.
I performed a simulation of the antenna in a radiation box composed of free space and the results (e.g. S11, radiation patterns, gain vs. freq) obtained are correct. I used radiation boundary conditions and the size of my radiation box is at least lambda/4 from the radiating structure.
For the lossy case simulation, I assigned the lossy material properties to the radiation box. Again, I'm using radiation boundary conditions and the lambda/4 dimension spec. I checked for convergence. However, the results that I obtain do not make sense. For example, the gain vs. freq plot depends on the size of the radiation box. The imaginary input impedance plot seems to be off by some orders of magnitude from what it should be.
Has anyone had problems in the past with HFSS and radiation into lossy media? Are there some settings that I should be aware of and am missing when it comes to simulating in lossy materials instead of free space radiation boxes?
Regards!
I performed a simulation of the antenna in a radiation box composed of free space and the results (e.g. S11, radiation patterns, gain vs. freq) obtained are correct. I used radiation boundary conditions and the size of my radiation box is at least lambda/4 from the radiating structure.
For the lossy case simulation, I assigned the lossy material properties to the radiation box. Again, I'm using radiation boundary conditions and the lambda/4 dimension spec. I checked for convergence. However, the results that I obtain do not make sense. For example, the gain vs. freq plot depends on the size of the radiation box. The imaginary input impedance plot seems to be off by some orders of magnitude from what it should be.
Has anyone had problems in the past with HFSS and radiation into lossy media? Are there some settings that I should be aware of and am missing when it comes to simulating in lossy materials instead of free space radiation boxes?
Regards!