(Single-axis tracking system) having a desired beam width in the tilt direction and the leakage of the waveguide slot array antenna (single-axis tracking system) having a desired beam width in the tilt direction by keeping the power-A plurality of radiating waveguides 1A to 1L each having a plurality of slots formed in parallel in the tube axis direction and arranged adjacently in parallel to each other and a plurality of radiating waveguides 1A to 1L connected to the radiating waveguides 1A to 1L And the feed waveguide 2 is rotated in a horizontal plane in the direction of the direction of the azimuth angle while the feed waveguide 2 is rotated along the first end of each of the radiation waveguides 1A to 1L, And a second portion 2B extending from the feeding portion 3 formed at the center of rotation of the leakage waveguide slot array antenna to the central portion of the first portion 2A, The waveguide 1A Slots formed 1L) at the same time the number of the cross-slot of these consisting of a cross-slot (4) having the same offset amount is set in a range from 13 17.
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