To provide an antenna capable of being brought into a mounting state where capacitive coupling to the ground of a wiring board is reduced, in relation to an antenna used for a wireless device or the like.
An antenna element 21 is formed into an element having a spiral structure part of a triangle in the side view which links in the order from a lower-surface linear part 23 having the front end used as a power feed part, through a rear surface linear part 24 and an upper L-shaped part 25, thereafter a first tilt part 26A, a rear first linear part 27A, an upper first crank part 28B and so on, and is arranged on an arrangement surface with hill parts each connecting lower corner parts of the spiral adjacent to each other. Thereby, the antenna element can be brought into a mounting state where, for instance, a third tilt part 26C becoming a side part of the arrangement part and the triangle is arranged at a position distant from the ground 11 of the wiring board 10 by a predetermined distance, and can provide various kinds of excellent antenna characteristics by reducing the capacitive coupling to the ground 11.
Hiroki Naito
Daisuke Nagano