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:
May. 14, 2002
Filed:
Jan. 03, 2000
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An antenna device used in mobile communication apparatus such as cellular phones, and which achieves good transmission and reception of information in more than one frequency band. Easy and wide ranging adjustment of the impedance properties of the antenna as well as their productive mass production is allowed. The antenna device includes a) a spiral-shaped first antenna element ( ) of which one end is open and the other end is electrically connected to a high frequency circuit inside a communication terminal; and b) a second antenna element ( ) having both ends being open, and which is insulated from and disposed on either outer or inner surface of the first antenna element ( ). The impedance properties of an antenna can be adjusted by changing the disposing position of the second antenna element ( ).