Double beam radar antenna includes two adjacent sources with microwave lens and polarisation filter

摘要

The antenna includes a microwave lens (1) with two sources on and near the focus. A polarisation filter (41) is located on the side of the lens opposite the sources. The output profile of (71) of the prism can be adapted to compensate aberrations caused by defocusing the sources. The antenna includes a microwave lens (1) having a first source (S1) located near to the lens focus, and a second source (S2) located at a distance (d) from the focus, near to the plane which is perpendicular to the focal axis (3). A polarisation filter (41) is located on the side of the lens opposite the sources. The two sources have orthogonal polarisation's, the first source (S1) having a polarisation substantially perpendicular to the prism plates. The output profile of (71) of the prism can be adapted to compensate aberrations caused by defocusing the sources. The profile can be symmetrical relative to a point (P) passing through the focal axis of the lens, with a convex part and a concave part.