| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antenna device that is made compact and is excellent in manufacturability. SOLUTION: The antenna device includes: a tapered conductor plate 20 in a single-sided shape, in which conductor width in a direction perpendicular to parallel planes 10 continuously decreases to form a tapered slot line between the parallel plates 10; a third conductor plate 30 provided at the side having wider conductor width of the tapered conductor plate 20 not in contact with the tapered conductor plate 20 between the parallel plates 10; and a coaxial line 40 having an internal conductor 41 for supplying the power to the tapered conductor plate 20 at the side having wider conductor width, and an external conductor 42 which is an opposite phase to the tapered conductor plate 20 and supplies the power to the third conductor plate 30, wherein a notch 21 is formed at a corner formed between one side of the first conductor plate 11 side and one side of the wider conductor width of the tapered conductor plate 20, and the coaxial line 40 is arranged at the position at which the electric length of a closed line comprising the tapered conductor plate 20, the first conductor plate 11, the third conductor plate 30 and the internal conductor 41 is almost 1/2 wavelength with respect to an operating frequency. COPYRIGHT: (C)2011,JPO&INPIT
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