FRESNEL REFLECTOR ANTENNA Russian patent published in 2014 - IPC H01Q21/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio engineering, in particular, to antenna equipment, and can be used in various radar stations, radio communication stations that use two distant frequency ranges, for instance, S- and -M-bands. The Fresnel reflector antenna contains a primary feed element 1, that forms spherical electromagnetic waves of two distant frequency ranges, a zone surface 2, formed by a set of non-transparent circular zones 7, 9, 11, 13, 15, semi-transparent circular zones 8, 10, 12, 14, 16, 17, 19, 21 and transparent circular zones 18, 20, 22. The total number of zones is equal to the number of circular zones for the maximum operating frequency. The said surface is located at the side of a dielectric layer 3, exposed to the electromagnetic wave radiated by the feed element 1. On the other side of the dielectric layer 3 a semi-transparent grid 4 is located, which consists of conductors, set in parallel. The antenna also contains the second dielectric layer 5, located between the grid 4 and a metallic screen 6.

EFFECT: expansion of the antenna functionality due to the operation in two distant frequency ranges with one radiating opening, and provision of the radiating pattern characteristics, close to the maximum ones in both frequency ranges.

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