A low profile double-layer polarizer structure is presented for planar patch antennas to obtain circular polarization in 3.5 GHz WiMAX band (3.4-3.6 GHz 5.7% bandwidth). Each polarizer layer is composed of 45 tilted metallic strips on a printed circuit. A bandwidth widening is obtained due to a significant reduction of the distance between polarizer and patches. The associated effects from the interaction of the two structures have been studied. A 2 2 array prototype has been implemented and measured, with a 8% average bandwidth in reflection and dual linear/circular polarization.
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Masa‐Campos et al. (2009) studied this question.
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