November 8, 2018 at 9:21 pmIsadoraSubscriber
I was wondering if I can get help on setting up transmitting antenna and receiving antenna spacing with far field without using extremely memory heavy simulations. I found some examples using integral equations(IE) to reduce the solution in free space but I'm not sure how to set it up properly for our application, especially for boundaries of two antennas and the air between them.
As for what I tried, two separate air boxes with FE-BI boundaries are used. But how to deal with the air between them, and does the air need extra boundary settings? Besides, I also tried using only one large radiation box for two antennas, however,the radiation pattern shows rough and periodic surface, which looks like the effect caused by reflection from the receiving antenna.For these two situations, the couplings are different by around 7dB.
I always get the radiation pattern of Tx array as shown in the picture, in one air box and two FE-BI boxes too. I wonder if this rough surface pattern is normal, or caused by reflection from Rx antenna.
Thank you in advance.
November 8, 2018 at 9:45 pmmfallahpAnsys Employee
User can define two boxes around each antenna and assign FEBI to each box. The solver will use IE to capture the interaction between the boxes and it will (by default) assume the medium between the boxes is air (user does not need to define it).
To check the radiation pattern calculation accuracy, user can increase the FEBI box size and see if that impacts the pattern.
To see Rx pattern, user can visit "Edit Source" option and change the excitation (turn off Tx and turn on Rx). Right click on "Excitations" in "Project Manager" and click on "Edit Source".
November 8, 2018 at 9:49 pmslouieAnsys Employee
No need to create large air box around the two antennas which have FEBI around them. Everything outside of FEBI box(es) is considered to be free space.
November 8, 2018 at 10:30 pmIsadoraSubscriber
Thank you for answers. So with the two FE-BI boxes, no matter how much the distance is, the simulator take them as far field spacing? Or the distance matters? As for the radiation pattern I showed, it seems look like getting reflection from Rx, since the surface is rough and periodic. If this is caused by reflection, is this inevitable?
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