Patent ID: 8159404

Claim:
A multi-frequency antenna comprising: an insulation support member formed in a rod shape, the support member having a first end, a central axis, an outer periphery, and a plurality of groove portions, each groove portion having a predetermined length formed on the outer periphery of the support member, the plurality of groove portions extending from the first end of the support member and substantially parallel to the central axis of the support member, the plurality of groove portions being formed at equal circular intervals with each other; a helical element wound around the outer periphery of the support member, the helical element being configured to have power supplied from a first end of the helical element and the helical element being operable in a first frequency band; a plurality of line-shaped elements, each of the plurality of line-shaped elements being disposed in respective groove portion of the plurality of groove portions formed in the support member, each of the plurality of line-shaped elements being configured to have power supplied from a first end of each of the plurality of line-shaped elements and each of the plurality of the line-shaped elements being operable in a frequency band that is different from the first frequency band; and an element fitting fitted with the first end of the support member, electrically connected to the first end of the helical element and to the first end of each of the plurality of line-shaped elements, and having an attachment portion formed in a lower portion of the element fitting, wherein the element fitting is configured to supply power to the helical element and the plurality of line-shaped elements, the only portion of each of the plurality of the line-shaped elements that electrically connects to the helical element is the first end of each of the plurality of the line-shaped elements, and at least one of the plurality of groove portions has no line-shaped element disposed therein.