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AWR2544LOPEVM: How to Determine the Polarization Direction of the LOP Port ?

Part Number: AWR2544LOPEVM

Hi,

    From the datasheet and evm pcb document, i can get much detail information about  LOP port, but i don't know how to determine the polarization direction of the LOP port, there's no electric field direction, so when i make a new waveguide antenna, the signal‘s phase between  different LOP ports may differ by 180°, the second pic shows the electric field direction of the LOP port as i desired, so i want to know how can i  determine the polarization direction of the LOP port of AWR2544LOPEVM.

Thank you !