Patent ID: 7639202

Claim:
An antenna apparatus comprising: a substrate having a GND pattern land and a power supply pattern land disposed on a same surface; an antenna element including an external element that has a helically extending portion extending away from a land formation surface of the substrate and an internal element that has another helically extending portion extending along an axis of the external element at an inside of the external element in a detached manner from the external element; and a retainer in contact with the external element and the internal element on the land formation surface for retaining the external element and the internal element in a predetermined positional relationship with each other, wherein one of the two elements included in the antenna element serves as a signal line and an other of the two elements included in the antenna element serves as a GND line, the retainer is made of a dielectric material, each of the external element and the internal element has a surface mount portion that is, as a connecting end to the helically extending portion, substantially parallel with the land formation surface of the substrate on one end that is used for fixation on the substrate, and the surface mount portion of each of the two elements is connected to respectively different lands.