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. 11, 2001
Filed:
Aug. 21, 1997
Harufumi Mandai, Takatsuki, JP;
Teruhisa Tsuru, Kameoka, JP;
Abstract
An antenna includes a spirally wound conductor composed of a copper wire or a covered copper wire, and a covering material consisting essentially of a resin or a resin mixture with 1<&egr;≦10. At least part of the conductor is covered with the covering material. One end of the conductor leads to the outside of the covering material to form an external terminal. Another end of the conductor forms a free end in the covering material. In addition, a method for adjusting the resonant frequency of the antenna includes at least the step of changing a winding interval of a part of the conductor which is not covered with the covering material or the step of covering with the covering material a part of the conductor which is not covered with the covering material, or both. Furthermore, the antenna preferably satisfies the following numerical expression: 1.3≦l/a·n ≦4 where l represents the coil length of said conductor; a represents the diameter of said conductor; and n represents the number of turns of said conductor.