Broadband Reflectarray Antennas Using Double-Layer Subwavelength Patch Elements

This letter investigates a novel bandwidth improvement method, which combines the multilayer approach with the subwavelength element technique. A new definition of phase error has been introduced to quantitatively analyze the performance of the reflectarray elements. It is shown that double-layer su...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2010, Vol.9, p.1139-1142
Main Authors: Nayeri, P, Fan Yang, Elsherbeni, A Z
Format: Article
Language:English
Subjects:
Bandwidth
broadband
Broadband antennas
Broadband communication
double-layer
Fabrication
Gain
Phased arrays
reflectarray
Reflector antennas
subwavelength
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Summary:This letter investigates a novel bandwidth improvement method, which combines the multilayer approach with the subwavelength element technique. A new definition of phase error has been introduced to quantitatively analyze the performance of the reflectarray elements. It is shown that double-layer subwavelength elements exhibit a superior phase performance across the band, namely an increased phase range and a reduced phase error over frequency. Numerical analysis is then performed to calculate the bandwidth of reflectarray antennas using these elements, where the practical fabrication tolerances at high frequencies are considered. Finally, a 1-dB gain bandwidth of 19.1% has been demonstrated for a double-layer -band reflectarray using elements with a periodicity of λ/4.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2010.2094178