Two-dimensional fractal metasurface and its application to low profile circularly polarized antennas

T. Cai, G.-M. Wang, J.F. Zhao and M. Yao

Journal of Electromagnetic Waves and Applications, 2015, vol. 29, issue 3, 410-423

Abstract: Two-dimensional (2D) Wunderlich-shaped fractal reactive impedance surface (WRIS) is designed and extensively investigated to reduce the dielectric substrate thickness without deteriorating the electromagnetic characteristic. Slot resonators, Hilbert-shaped complementary single ring resonator (HCSRR), and the complementary three-turns spiral resonator have been used to achieve antenna miniaturization and also to render the circularly polarized (CP) wave. For demonstration, WRIS-inspired HCSRR- and TCSR-loaded CP antennas are optimized, fabricated, and measured. Numerical and experimental results indicate that both antennas owe compact size smaller than 0.18λ0 × 0.25λ0 × 0.017λ0, exhibit comparable impedance, and axial ratio (AR) bandwidth better than 1.60% and pure CP performances. Furthermore, the antennas are free of metallic via holes and easy of fabrication, indicating promising applications in wireless communication systems.

Date: 2015
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DOI: 10.1080/09205071.2015.1005177

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