kae_jolie
Full Member level 4
1. If I am going to have a receive antenna in simulation model, why do I need a radiation box? The radiation box measures the power radiated, gain, etc....in the far field, but what if I have an antenna in far filed to measure all that?
2. Also, the minimum radiation box size of lambda/4 is not in the far field since minimum distance in far field is rff = 2 * (D)^2/lambda, where D is largest dimension of antenna.
Take for example lambda = 327mm and D=150mm,
lambda/4 = 82mm, and
rff = 138mm
So, basically the radiation box where radiation is measured is in the near field?!!! I am getting far-field measurements in HFSS when I simulate with a lambda/4 radiation box, are they not correct measurements?!!!
3. Final Question, what if I have a receive antenna in HFSS, how different will it be from the transmit antenna as far as setting up the source gap, etc...
I'd appreciate it if you hit all my 3 questions.
Thanks.
2. Also, the minimum radiation box size of lambda/4 is not in the far field since minimum distance in far field is rff = 2 * (D)^2/lambda, where D is largest dimension of antenna.
Take for example lambda = 327mm and D=150mm,
lambda/4 = 82mm, and
rff = 138mm
So, basically the radiation box where radiation is measured is in the near field?!!! I am getting far-field measurements in HFSS when I simulate with a lambda/4 radiation box, are they not correct measurements?!!!
3. Final Question, what if I have a receive antenna in HFSS, how different will it be from the transmit antenna as far as setting up the source gap, etc...
I'd appreciate it if you hit all my 3 questions.
Thanks.