Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2008-01-29
2008-01-29
Nguyen, Hoang V. (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S846000
Reexamination Certificate
active
11238430
ABSTRACT:
The method and apparatus described herein improves the impedance matching of a multi-band antenna. In particular, the multi-band antenna comprises a radiating element vertically displaced from an antenna ground plane by feed and ground elements, and a parasitic element interposed between the feed and ground elements. When the multi-band antenna operates in the first frequency band, a selection circuit connects the parasitic element to the ground plane to capacitively couple the ground element to the feed element. However, when the multi-band antenna operates in the second frequency band, the selection circuit disables the capacitive coupling. By applying the capacitive coupling only when the multi-band antenna operates in the first frequency band, the present invention improves the performance of the antenna in the first frequency band without adversely affecting the performance of the antenna in the second frequency band.
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Coats & Bennett P.L.L.C.
Sony Ericsson Mobile Communications AB
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