Antenna lens comprising a dielectric component diffractive suitable shaping a wavefront microwave

摘要

A lens antenna including at least one diffractive dielectric component capable of shaping a microwave frequency wave front having a wavelength comprised in a range from 1 millimeter to 50 centimeters, said diffractive dielectric component including a plurality of main microstructures formed in a substrate material with a substrate refractive index so as to form an artificial material of an effective refractive index, each main microstructure having a size of less than a target wavelength taken from said range of wavelengths, said main microstructures being laid out per zones, so as to make a surface filling level vary, the effective refractive index being a function of said surface filling level, the layout being such that the effective refractive index varies inside said one zone of said diffractive dielectric component quasi monotonously between a minimum value and a maximum value less than or equal to the substrate refractive index.

主权项

1. A lens antenna including at least one diffractive dielectric component possessing a focal point and configured to shape a microwave frequency wavefront emitted by a microwave frequency source having a wavelength comprised in a range from 1 mm to 50 centimeters, the microwave frequency source being located in proximity to the focal point of the diffractive dielectric component,
wherein said diffractive dielectric component includes a plurality of main microstructures formed in a substrate material with a substrate refractive index (ns) so as to form an artificial material with an effective refractive index (n), each main microstructure having a size (d) smaller than a target wavelength (λ0) taken from said range of wavelengths, said main microstructures being laid out per zones, so as to make a surface filling level vary, the effective refractive index (n) being a function of said surface filling level, the layout being such that the effective refractive index (n) varies inside at least one of said zones of said diffractive dielectric component quasi monotonously between a minimum value and a maximum value less than or equal to the substrate refractive index (ns).