PURPOSE:To provide a plane antenna for receiving a satellite broadcasting with a high efficiency by forming the outline form of an annular slot to a rectangle having a specific dimension and diagonally cutting a pair of angles of in the diagonal direction of the square form of a specific dimension to form a patch element. CONSTITUTION:The outline form of the annular slot 7 is formed to the rectangle having the long side (a) of a length of 14-16mm, the short side (b) of the length of 12-14mm and the difference in the length therebetween of above 0.5mm, the patch element 6 is constituted by diagonally cutting off the pair of the angles in the diagonal direction of the square form having one side of the length of 6-8mm and the respective length of a non-cut part (d) is defined to be 1-4mm. Thereby, the antenna gain of 31+ or -0.3dBi is obtained throughout the band of 11.7-12.2GHz.
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