Horn antenna having a dielectric insert with a wide-based cone section

摘要

An antenna for transmitting microwaves is provided, which radiates microwaves to be transmitted as far as possible uncorrupted into free space and operates in a low-loss manner, having a circular waveguide (13) short-circuited at the end on one side, in which circular waveguide a transmitting element (15, 33) for feeding in microwaves is arranged, a funnel-shaped horn (25) adjoining an open end of the circular waveguide (13), the radius of which horn increases in the direction facing away from the circular waveguide, and an insert (27) made of a dielectric, which insert has a first cylindrical section (29), which fills the circular waveguide (13), and which insert has a conical section (31), whose tip points in the direction facing away from the circular waveguide and whose base area has a diameter which is greater than a diameter of the cylindrical section (29).