The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2007
Filed:
Sep. 18, 2006
Yusuke Nakamura, Fukushima-ken, JP;
Yusuke Nakamura, Fukushima-ken, JP;
ALPS Electric Co., Ltd., Ota-Ku, Tokyo, JP;
Abstract
An antenna device includes a substrate formed of a dielectric body or a magnetic body, first to third radiation conductors wound in spirals around outer circumferential surfaces of the substrate, a plurality of capacitance elements spread over the first radiation conductor and the second radiation conductor, and a high-frequency switch interposed between feed ends. The feed ends are selectively connected to a high-frequency circuit via the high-frequency switch connected to a tuner. Since the total length of the second and third radiation conductors connected in series with each other is longer than that of the first radiation conductor, the first radiation conductor is capable of resonating in a high band and the second and third radiation conductors are capable of resonating in a low band. By changing the capacitances of the variable capacitance elements from the tuner side, a resonant frequency can be changed within a selected frequency band.