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:
Jul. 04, 2006
Filed:
Jan. 21, 2005
Makoto Shigihara, Fukushima-ken, JP;
Yusuke Nakamura, Fukushima-ken, JP;
Makoto Shigihara, Fukushima-ken, JP;
Yusuke Nakamura, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention provides an antenna device capable of automatically obtaining excellent receiving sensitivity over a wide band. The antenna device comprises a rod-shaped base made of a dielectric material or a magnetic material; a stripe-shape radiating conductor divided into a plurality of radiating conductors wound around the base; and variable capacitive elements provided to correnspond to the same number of the radiating conductors. The radiating conductors and the variable capacitive elements are alternatively arranged on the base and are connected in series to each other, the radiating conductor having its one end connected to the variable capacitive element serves as an opening side and the variable capacitive element having its one end connected to the radiating conductor serves as a signal feeding side, and capacitance values of the variable capacitive elements increase or decrease in the same direction to be tuned to a predetermined frequency.