RADAR ANTENNA

PROBLEM TO BE SOLVED: To provide a radar antenna where an installation area of a transmis sion reception section can be increased, a degree of freedom of the layout is increased and the shield effect is enhanced without the need for a special shield structure. SOLUTION: A shield case 6 consists of a flat base plate 6a on which a transmission reception section 2 is mounted and of a cover 6b that is freely attached to/detached from the base plate 6a. A circulator 23 to an upper face 23a of which an opening 23b in coaxial connection is formed. A support section 6d is provided to an upper position of the circulator 23 and a coaxial body 20 is fixedly supported in the inside and connects with an antenna 3. The height of the circulator 23 is selected nearly equal to a height of an inner face of the cover 6b, and a shield use choke 6f and a shield packing 27 are provided and shielded to a position with a prescribed diameter around a connection end face of the opening 23b and the coaxial body 20 in a torus shape respectively.