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In a phased array system, what will have to change in a receiver's architecture if it needs to work for both linear and circular polarization?

I saw in the Beat – Ku Band specifications this statement:

Supports automatic circular polarization control by embedding 0o/90o phase controllable phase shifters.

Can anyone please explain to me why they used the phase shifter?

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Nothing systematic. The array elements need to be able to pick up the circular polarization, but the antenna gain comes from the phase difference, which doesn't care about polarization.

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    \$\begingroup\$ I am sorry but I could not get the idea why they needed the phase shifter and mentioned it that it is for circular polarization, Can u please elaborate a little, may be it is a basic concept but i am really struggling to grasp it \$\endgroup\$ Commented Feb 28, 2019 at 22:48
  • \$\begingroup\$ The phase shifting is for the two linear polarizations of the individual antennas. You can use two cross-polarized linear antennas with the same phase center, and link them with a phase shift and get a circularly polarized antenna. That applies to the individual antennas, but has nothing to do with the fact you might be using these antennas in an array. \$\endgroup\$ Commented Mar 1, 2019 at 7:26

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