PRIMARY RADIATOR

PROBLEM TO BE SOLVED: To provide a primary radiator whose performance can be stabilized by suppressing a cavity generated inside a dielectric feeder. SOLUTION: A holding part 11a and a radiating part 11b are integrally formed in a dielectric feeder 11 made of synthetic resin. The holding part 11a is held at the opening edge of a waveguide 10, and a radiating part 11b is projected from the opening edge of the waveguide 10. Then, a plurality of bottomed holes 18 which have a depth of about 3/4 wavelength of the free space wavelength λ of a radio wave are formed on the edge face of the radiating part 11b, and those bottomed holes 18 are arrayed on orthogonal 2 straight lines P and Q crossing at almost 45 degrees with both probes 12 and 13. COPYRIGHT: (C)2004,JPO