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:
Jan. 16, 2001
Filed:
Apr. 06, 1999
Louis Jay Vannatta, Crystal Lake, IL (US);
Hugh Kennedy Smith, Palatine, IL (US);
James P. Phillips, Lake in the Hills, IL (US);
David Ryan Haub, Lake in the Hills, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A difference drive diversity antenna structure (,) and method for a portable wireless communication device (,) aligns a first linear antenna (,) parallel to a major axis (,) of the communication device and drives dual radiators (,) of a second antenna (,) at equal magnitudes but with a 180 degree phase difference. A difference drive diversity antenna structure implemented in a portable wireless communication device maintains significant decorrelation between the first antenna (,) and the second antenna (,) over the common frequency ranges of the dual radiators (,). Also, antenna currents on the body of the communication device are minimized and the effects of a hand or body near the communication device are reduced.