A reflectarray antenna composed of double square rings of variable lengths printed on a conductor‐backed substrate is proposed for reflectarray‐bandwidth enhancement. Using this technique, a single‐layer reflectarray of a wider bandwidth compared to conventional single‐layer reflectarrays is designed, fabricated, and measured. The measured results demonstrate a radiation efficiency close to 52% and 1‐dB gain bandwidth of 9%, centered at 22 GHz.
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Chaharmir et al. (2006) studied this question.
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