Abstract
A wideband phase shifting surface (PSS) antenna is presented with stable and large quasi-nondiffraction range. The operation principles and design procedures for the wideband near-held focusing antenna with large depth-of-field are introduced. Then, the difference between the depth-of-field (Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> )fixed and the half-power beamwidth-fixed wideband design is demonstrated. As an example, a wideband Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> -fixed PSS antenna is designed and fabricated. Phase shifts of PSS elements are synthesized by using a least mean-square error minimization method to approximate the ideal phase shift on the aperture of the antenna within the entire bandwidth. The developed prototype can be used as a Z <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> -fixed beam launcher from 26.5 to 30.5 GHz. This type of antenna can be easily fabricated with the standard Printed Circuit Board process and fed by a horn antenna with an arbitrary polarization. The proposed structure has unique advantages: wideband applicable, large depth-of-field, and variable polarizations.
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