Abstract
This paper presents a broadband, low-profile, and planar reflectarray antenna based on an achromatic metasurface. The achromatic metasurface has advantageous broadband focusing capabilities compared to conventional reflectarrays. Six types of unit cells offering versatile phase responses are employed to design an achromatic metasurface optimized by a convolutional algorithm. A broadband achromatic reflectarray antenna with a diameter of 270 mm is simulated, fabricated, and tested. The test results agree well with the simulated results. Notably, the 3-dB realized gain of the reflectarray antenna reaches a fractional bandwidth of 58.2% at a range of 8.9 GHz to 16.2 GHz. Furthermore, the reflectarray antenna significantly enhances the feeding antenna’s gain from 7.3 GHz to 17 GHz. The reflecting metasurface also has a low profile of 0.11 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> , where λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> is the wavelength in free space at 7.3 GHz. With excellent broadband performance, high gain, low profile and ease of fabrication, the developed reflectarray antenna serves as a promising device for long-distance integrated communication systems.
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