The design of zone plates is an important topic in many areas of physics, such as optics,\nX-rays, microwaves or ultrasonics. In this paper, a zone plate design method, which provides high\nflexibility in the shaping of the focusing profile, is analyzed. This flexibility is achieved through the use\nof binary sequences that produce zone plates with different properties and applications. It is shown\nthat this binary-sequence method works properly at low wavelengths, but requires a modification\nterm to work accurately in high wavelength domains. This additional term extends this powerful\ndesign method to any wavelength. Simulation results show acoustic focusing profiles for Fresnel,\nFibonacci and Cantor zone plates operating at a wavelength of 1.5 mm without any distortion.
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