AndreyG
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Most likely but not necessarily. For example patch with truncated corners does not use phase shifter yet generates CP.... but there must be a phase shifter on the bottom side then.
It's not the truncate corners, it's the asymmetrical feed position that makes the 90° phase shift required for circular polarisation. Something similar will be used in the photo.Most likely but not necessarily. For example patch with truncated corners does not use phase shifter yet generates CP.