Miguel A Richard

US Patent:

7102577, Sep 5, 2006

Filed:

Sep 30, 2004

Appl. No.:

10/955395

Inventors:

Miguel A. Richard - Sunrise FL, US
Antonio Faraone - Plantation FL, US

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H01Q 1/24

US Classification:

343702, 343727, 343846

Abstract:

Antenna systems for handheld wireless communication devices () that comprise a first unbalanced feed antenna () and a second balanced feed antenna dipole antenna () that are located next to a ground structure () for the handheld wireless communication devices are provided. The balanced feed dipole antenna and the unbalanced feed antenna exhibit disparate spatial-polarization patterns which are suitable for use with a MIMO transceiver, and the decorrelation of signals received by the two antennas is preserved due to a low level of coupling through the ground structure, which is due, in part, to differences in the symmetry properties of current patterns in the ground structure that are associated with the operation of the two antennas. The two antennas can also be used in a transceiver () that uses separate antennas to receive and transmit.

US Patent:

60023694, Dec 14, 1999

Filed:

Nov 24, 1997

Appl. No.:

8/977322

Inventors:

Miguel A. Richard - Sunrise FL

Assignee:

Motorola, Inc. - Schamburg IL

International Classification:

H01Q 138
H01Q 124

US Classification:

343700MS

Abstract:

A microstrip antenna (300) provides improved bandwidth control by gap coupling first and second triangular patches (310, 312) over a ground plane (322). The first and second triangular patches (310, 312) are resonant at different frequencies. The use of gap-coupled triangular patches (310, 312) allows for smaller structured microstrip antennas.