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An Offset-Fed X-Band Reflectarray Antenna Using a Modified Element Rotation Technique

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5 Author(s)
Yu, A. ; Dept. of Electr. Eng., Univ. of Mississippi, Oxford, MS, USA ; Yang, F. ; Elsherbeni, A.Z. ; Huang, J.
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An X-band circularly polarized reflectarray antenna with an offset feed is designed, fabricated, and measured. The proposed design features the use of split square ring elements with a modified element rotation technique for phase compensation, which allows the rotation of the slot instead of the element itself. This is crucial in single-layer multiband reflectarray antenna designs where it is desired to minimize the effectively occupied area by individual elements. A design flow chart of the reflectarray antenna is summarized, and the element/system design procedure is presented in details. A reflectarray prototype was measured in a near field measurement system, which operates at 8.4 GHz with a gain of 30.4 dB and an aperture efficiency of 53.7%. Both the axial ratio bandwidth (AR <; 3 dB) and the 3 dB gain bandwidth are 6%.

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Antennas and Propagation, IEEE Transactions on  (Volume:60 ,  Issue: 3 )