Abstract
A new re∞ectarray conflguration is proposed for low-loss applications at millimeter waves. It is based on the use of dielectric resonator antennas (DRA) as radiating unit-cells. The phase response of the elementary cell is controlled by adjusting the length of a parasitic narrow metal strip printed on the top of each DRA. A 330 - phase dynamic range is obtained for DRAs made in rigid thermosetting plastic (r = 10). As the antenna radiating aperture is non ∞at, an original low-cost fabrication process is also introduced in order to fabricate the parasitic strips on the DRA surface. A 24 £ 24- element array radiating at broadside has been designed at 30GHz and characterized between 29 and 31GHz. The antenna gain reaches 28.3dBi at 31GHz, and the measured i1dB-gain radiation bandwidth is 5.2%. The 3.2dB loss observed between the measured gain and theoretical directivity is mainly due to the spillover loss (2.3dB). The total dielectric and conductor loss is less than 0.9dB.
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