Patent ID: 8508417

Claim:
An antenna comprising: an antenna element including a dielectric base having a feeding radiation electrode formed on the dielectric base; a substrate having a ground electrode and an ungrounded area in which no ground electrode is formed provided at an end portion of the substrate, the antenna element being provided in the ungrounded area of the substrate; and a first extension element, wherein the feeding radiation electrode has a feeding terminal at a feeding end thereof and extends along a surface of the dielectric base in a helical or looped manner so as to return to a position adjacent to the feeding terminal, the feeding radiation electrode has a first external terminal at a position on the dielectric base substantially corresponding to a node of the distribution of voltage intensity of a harmonic wave distributed in the feeding radiation electrode, the substrate includes a first external-terminal electrode to which the first external terminal is connected, and the first extension element extends from the first external-terminal electrode so as to be separated from the ground electrode.