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. 16, 2003
Filed:
Jul. 23, 2002
Henry H. Nguyen, Fort Worth, TX (US);
Michael S. Pieper, Fort Worth, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A multi-frequency antenna apparatus includes an open-ended slot antenna ( ) operable at high frequencies, cascaded in series with a antenna element ( ) operable at low frequencies, results in two distinct antennas fed by a single excitation port ( ). A U-shaped conductive strip ( ) defining the slot antenna ( ) has a ground connection ( ) at one end near the open-ended side of the slot antenna ( ) and a virtual feed point ( ) on the other end coupled to the antenna element ( ). The electrical length from the ground connection ( ) to the feed point is about ¼ of a wavelength of the first frequency creating a virtual open at the feed point ( ).