Antenna device
AssigneeSaab AB
InventorOla Forslund
Life of this patent
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Abstract
An antenna device including a reflectarray with array antenna elements, and an outer feed provided with a waveguide and a widening funnel which in a widened end carries a waveguide aperture for illumination of the reflectarray. The antenna device eliminates or at least reduces a position dependence of an antenna lobe with respect to frequency. Furthermore, the antenna device presents a low monostatic radar cross section and compactness. To this end the antenna device is fed offset and is provided with a device for movement of a phase center of the antenna with a frequency relative to the waveguide aperture of the feed in the vicinity of the waveguide aperture.
Claims10
An antenna devices comprising:
- a reflectarray comprising array antenna elements,
- an outer feed provided comprising a waveguide, wherein the feed is arranged to illuminate the reflectarray in an offset arrangement,
- a widening funnel comprising a widened end including a waveguide aperture for illumination of the reflectarray, and
- a device for movement of a phase center of the antenna feed with a frequency relative to the waveguide aperture of the feed is arranged in the vicinity of the waveguide aperture.
The device wherein the feed comprises at least two rectangular waveguides feeding the antenna elements of the compact array antenna.
Dependencies are inferred from the claim text.