Abstract
In this paper, a novel approach was used to design two-layer stacked high-gain microstrip antenna array with improved bandwidth and high aperture e-ciency. Cross Snow∞ake fractal microstrip patches were employed as radiation elements. Varieties of antenna arrays with difierent fractal iterations were optimized by using the Genetic Algorithm (GA) associated with 3D full-wave Finite Element Method (FEM) in order to investigate the in∞uence of the Cross Snow∞ake fractal radiators. As compared with the conventional square patches, the Cross Snow∞ake fractal conflguration provides extremely high ∞exibility to achieve a wideband performance and maintains higher aperture e-ciency at operating frequency band. A prototype antenna with 2£2 Cross Snow∞ake radiators was fabricated and measured. Both simulated and measured results show that the proposed antenna has some promising performances to be more specially, the measured impedance bandwidth is 22.9% (from 5.18GHz to 6.52GHz) when S11 < i10dB; the simulated gain is 12.0dBi and its corresponding aperture e-ciency is up to 87.4% at the working frequency 5.8GHz.
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