A radiation electrode 132 is printed on the upper surface of the dielectric body, side surface thereof, and bottom surface thereof in a folded configuration. A feeding electrode 130 and ground electrode 134 are printed on the bottom surface of the antenna elements 124 . The feeding electrode 130 and radiation electrode 132 on the upper surface are opposed to each other as parallel planes. The ground electrode 134 and radiation electrode 132 are also opposite to each other as parallel planes. No electrode is formed on one of the side surfaces of the antenna element 124 that is opposed to the side surface at the side of which the radiation electrode 132 is folded.
1. An antenna device comprising:
an antenna element, which includes a dielectric body having substantially a rectangular solid shape on the surfaces of which a radiation electrode, a feeding electrode, and a ground electrode are formed; and
a printed board including a mounting area in which the antenna element is mounted and a ground pattern area formed around the mounting area, wherein
both the feeding electrode and the ground electrode are formed only on the bottom surface of the dielectric body,
the radiation electrode is formed on the upper surface of the dielectric body, a first side surface thereof, and bottom surface thereof in a folded configuration,
a second side surface opposite to the first side surface is configured as a non-electrode formation area, and
a part of the radiation electrode is formed on the upper part of both or one of the third and fourth side surfaces adjacent to the first and second side surfaces.
2. The antenna device according to claim 1 , wherein the radiation electrode is formed on the entirety of the upper surface.
3. The antenna device according to claim 1 , wherein the radiation electrode is formed on the entirety of the first side surface.
4. The antenna device according to claim 1 , wherein the ground electrode is formed as to be opposed to the radiation electrode with a gap having a predetermined width interposed therebetween on the bottom surface.