kawakubo
Newbie level 3
hfss directivity
Hello all,
I am learning how to use HFSS to simulate the radiation pattern of antennas. As a first step, I created a model of a half-wavelength dipole. I tried to verify the simulation agrees with the theoretical value to check if the simulation is correct or not. I plotted the radiation pattern and it has a donut-like 3-d pattern as expected. However, the peak gain does not agree with the expected value (2.15dB)
I thought that the problem is due to incorrect setting on the radius of the radiaton boundary sphere. So, I did a parametric sweep with the radius of the radiation boundary as a sweeping variable. I expected the result converges to the theoretical one as the radius increases. But the simulated gain flucuates with the radius of the sphere between 1.7 and 2.2dB and it did not converge as opposed to what I expected. I am wondering why the result changes so much with the radius. I know that the recommended setting is lambda/4 away from the object. But I think the result should not change with the radius if it is larger than lambda/4.
Does anyone have any idea on what's wrong with my model?
Thanks in advance.
-Hiro
Hello all,
I am learning how to use HFSS to simulate the radiation pattern of antennas. As a first step, I created a model of a half-wavelength dipole. I tried to verify the simulation agrees with the theoretical value to check if the simulation is correct or not. I plotted the radiation pattern and it has a donut-like 3-d pattern as expected. However, the peak gain does not agree with the expected value (2.15dB)
I thought that the problem is due to incorrect setting on the radius of the radiaton boundary sphere. So, I did a parametric sweep with the radius of the radiation boundary as a sweeping variable. I expected the result converges to the theoretical one as the radius increases. But the simulated gain flucuates with the radius of the sphere between 1.7 and 2.2dB and it did not converge as opposed to what I expected. I am wondering why the result changes so much with the radius. I know that the recommended setting is lambda/4 away from the object. But I think the result should not change with the radius if it is larger than lambda/4.
Does anyone have any idea on what's wrong with my model?
Thanks in advance.
-Hiro