Too few frequency points to read a systematical behavior into the measurements, I think It might be an oscillating phase.It seems, the phase center is centered within the aperture and first moves backward with frequency. Further increase of frequency then shifts it forward.
I suspect that your waveguide em-excitation mode changes. Are you sure it is not (upper freq is almost twice of lower one).Hi biff44, well phase center acutally does change with frequency.
This is pretty much a problem if antennas are part of distance sensors or tracking/imaging sensors.
I am just wondering why the dependency is not "straight". It moves back and forth...
https://www.nsi-mi.com/images/Techn...Phase-Center Determination and Adjustment.pdf
Thanks.
@Terminator3: Other simulations from 75 to 110 GHz (mono mode operation) give the same results.
@juppydu: Calculationof CoP is done by CST. Angular range is not a parameter, but angle-step=1 degree.
I will check the phase ...
Dear juppydu,
boresight means CST will use the main field component that is alligned to the theta (elevation) direction - should be fine for our setup.
We use +/-15 degree=30 degree around the main propagation direction.
The phase center calculation differs for elevation and azimuth (E- and H-plane), using the setting EH (both) just gives the mean value (see attachment).
After all, I think the calculations are correct.
Thanks, -e
one interesting thing....if you are transmitting with a quarterwave monopole over a ground plane, and the receivig antenna dipps below that plane, there is a sudden 180 degree phase shift. That surprised me the first time i saw it.
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