Unit Cell for Reflectarrays Operating With Independent Dual Circular Polarizations
Résumé
A unit cell for dual-circularly-polarized (CP) re-
flectarrays illuminated by a dual-CP primary feed is designed
and validated experimentally around 8.5 GHz. It is composed of
two layers reflecting independently and simultaneously the two
incident circular polarizations. The first layer is a circular polarization
selective surface (CPSS) based on an enhanced version of
the original Pierrot’s cell with multiple wires bent in a crank-like
shape. The second layer is made of dipoles printed on a grounded
substrate; it is used to reflect the incident right-hand CP (RHCP)
wave transmitted through the CPSS with a 2-bit phase resolution.
This letter demonstrates that the sole association of both layers
is not sufficient to reach the expected behavior. An additional
optimization step is required to cancel out uncontrolled reflections
and improve isolation between both polarizations. The simulated
and measured characteristics are in good agreement for the two
circular polarizations
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