Abstract
This paper investigates the use of double concentric circular ring elements arranged in a sub-wavelength grid on a single layer of substrate, in an efiort to enhance the beam-scanning capability of re∞ectarrays. The work is done at 10GHz on a 405mm £ 405mm aperture. In addition to a broad gain bandwidth, the re∞ectarray with a sub-wavelength grid exhibits a superior beam-scanning performance compared to the one with ‚=2 grid. The measured results show that the re∞ectarray with 0:3‚ grid spacing achieves a 1-dB gain bandwidth of 22% with an aperture e-ciency of 56.6%. With the re∞ectarray flxed, this paper studies the possibility of beam scanning by displacing the feed horn laterally. The results show that beam scanning of §15 - is possible while preserving the broadband characteristics. It is also observed that a 1-dB gain bandwidth of 28% is achieved for the 0:3‚ array when the feed is displaced laterally with an angle of 30 - .
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