Wideband Wide-Angle Scanning Phased Array Based on Miniaturized Metasurface Antenna
Yan Li, Shaoqiu Xiao
Abstract
Wideband wide-angle scanning metasurface phased arrays are studied in this article. To ensure grating lobe free across the entire operation frequency band and within a wide beam scanning range, a novel metasurface antenna miniaturization method based on metasurface dispersion characteristic analysis is first proposed. Unique metasurface dispersion curves with width independent and high slope characteristics are utilized to miniaturize the metasurface antenna. Compact radiating aperture of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.38\lambda _{\mathrm {h}} \times 0.42\lambda _{\mathrm {h}}$ </tex-math></inline-formula> and impedance bandwidth of 30.1% with broadside radiation are achieved, where <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda _{\text {h}}$ </tex-math></inline-formula> is the free space wavelength of the highest operation frequency. Subsequently, the proposed miniaturized metasurface elements are applied to construct linear and 2-D phased arrays to study their wide-angle beam scanning performance across the entire operation frequency band. Scanning blindness elimination and backward radiation suppression issues are discussed and addressed in arrays. Finally, proof-of-concept prototypes of two eight-element <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$H$ </tex-math></inline-formula> -plane, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$E$ </tex-math></inline-formula> -plane linear phased arrays, and an <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$8\times8\,\,2$ </tex-math></inline-formula> -D phased array achieve ±60° beam scanning range across the entire operation frequency band of more than 22% bandwidth.