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[SOLVED] why dip come on elevation pattern?

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Manjuladevi

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Hi,
I have got measured radiation patterns for 3.3-4.2G Omni antenna.
Im giving 3Elements with .83lambda spacing between each dipole.
1638434129894.png

why this main lobe dip came ?
Kindly help me.
 

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Usually the reason of this dip in the array pattern is due to a random phase error(s) in the phase shifters which are used in an antenna array to steer the beam.
If your array do not have phase shifters (not interested in steering the beam), still may have a phase difference due to the feed traces of antenna elements.
 

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