Antenna Radiation Patterns

[bettisfr]

@S_Carroll

@bettisfr

@S_Carroll

For the benefit of others reading this thread, just to emphasise that you need to use Figure 3 as a reference to the labelling of the planes shown in Table 11.

Also, the radiation patterns were measured using a special horn measuring antenna, rather than with a ‘second’ DWM1001-Dev board, as you suggested, bettisfr.

When you have your product certified in a test lab, they rotate the product on a turntable with the measuring horn antenna oriented vertically (phi polarisation) and also with it oriented horizontally (theta polariasation) in order to find the maximum power. This is what’s presented in the datasheet - though it’s always challenging to present clearly!

Bettisfr,
It looks like an unusual application you have due to the way your nodes move relative to eachother. I would usually suggest trying to keep ranging devices facing eachother (in eachother’s azimuth, or XZ, planes) if at all possible, as this is how you maintain maximum omnidirectionality and location accuracy (as changes in gain lead to variation in ranging results). Are you implementing a TWR system with multiple anchors, or just ranging to a single node?

Now I’m only sending many string messages between a mobile antenna attached to a drone and a fixed antenna on the ground.
This is the first step.
The second step, is to range the node in the same way, that is, fixing an antenna on the ground and using a mobile flying antenna.

If possible, I think it would be good to have more than one fixed antenna on the ground and average the range results so that a less accurate range result when you’re in a null of one antenna can be compensated by a more accurate result from the other antenna.

Yes but by design, I will have one or more fixed antennas on the ground and one mobile flying antenna on the sky.
I will take distance measurements sufficiently apart from each antenna.
Finally I will apply trilateration for estimating the position of each antenna on the ground.

This is a strange application, I know… but it is research