I have a need to change 4 antennas phase in the 2.4 GHz frequency to form a main lobe in different directions.
I can't figure out which components I need to use to get the desired result.
Thank you in advance for your help.
You might try looking at the ADL5390 vector modulator. There are a few drawbacks going with this part as it is an active design so a bit power hungry and needs an external 90 degree hybrid to get the input signal into quadrature.
There may be some passive solutions out there, but I don't know of any offhand.