Hi,
I have two transmit antennae and one receive antenna placed in between them (All are Half Wave Dipoles). The spacing between the antennae is in the order of a wavelength. Both transmit antennae transmit at the same frequency and the receive antenna would receive some of this power as it is tuned to the same frequency. I set this up in HFSS as follows:
The Half Wave dipole antennae are created as per the video tutorial given by ANSYS (See link). Used PEC for the antennae arms and a small feed gap in between. Used a lumped port for each antennae. The entire structure is surrounded by a radiating boundary (vaccum). I used edit sources to set the scaling factor of the antenna used as receiver to zero. Solution type is Driven Modal.
Questions:
Is this setup sufficient to model the situation? Will setting scaling factors to 1 for transmitter and 0 for receiver suffice?
How can I determine the received power due to both the transmit antennae in the receiver? I think the S parameters should give me an idea of the power transfer between individual transmitter-receiver pairs, but I want to study the effect of constructive/destructive interference due to the two transmit antenna on the received power. So how will I obtain this metric?
P.S: I am using HFSS 13.0.
https://www.youtube.com/watch?v=dUC720AJvK0
Hello Mohan,
i think you can use Friis equation, because the relation between the transmit and receive power is usually given by Friis free space equations.
best regards
Thank you for the response. I don't think Friis equation will be appicable here because as I understand it, interference occurs in the field level. The electric fields add to produce a total electric field, and same is the case for magnetic field. Then we get the power from the total fields using the equation for power density (0.5*E x H).
If the Friis equation is used, the only choice is to superpose the powers, which would not give the desired result. It would not account for interference.
Is there a way to get the power absorbed by the receiver antenna? Or maybe to determine the electric field that is incident in that antenna?
Hi,
I understand your problem, there is no need to apply friis equation even it is the best way.
By calculating the values of S21 and S11, you can directly calculate the received power, power loss, transmitted power etc., by comparing S parameters with incident power, reflected power. Using power, you can directly calculate the electric field and magnetic field with the help of poyting theorem.
Thnaks and All The Best,
Hi , have you tired: the Results/create far field reports/Rec plots/ antenna parameters/ radiated power ?
Were you able to run your simulations? If so, how did you go about it?
I have also tried the same thing but the thing is that the plane wave source uses a Floquet port and the antenna is using a lumped port. So measurement through two different types of ports seems to be difficult. Can anyone give the solution for this?
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