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This article describes a circularly polarized 2 × 2 microstrip antenna array with corporate feeding to be used at K‐Band (18.7‐19.2 GHz) as a reflectarray feed. A design approach is proposed for the improvement of axial ratio and impedance bandwidths of circularly polarized microstrip antenna arrays with sequential rotation. A parametric analysis is also proposed to evaluate accurately the array phase center position. An array prototype has been designed, fabricated, and tested. The good agreement obtained between simulation and experimental results provides validation of the design approach and proof of the proposed concept.

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