A broadband reflectarray antenna with double square rings

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. © 2006 Government of Canada. Exclusive worldwide publication rights in the article have been transferred to Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1317–1320, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21630