Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2008-07-29
2008-07-29
Phan, Tho G (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S815000, C343S846000
Reexamination Certificate
active
11239589
ABSTRACT:
The method and apparatus described herein improves the bandwidth of a selected frequency band of a multi-band antenna. In particular, a selection circuit selectively applies capacitive coupling to the multi-band antenna to improve the bandwidth of a first frequency band without adversely affecting the bandwidth of a second frequency band. To that end, the multi-band antenna of the present invention comprises a main antenna element and a parasitic element disposed proximate the main antenna element. When the multi-band antenna operates in the first frequency band, the main antenna element capacitively couples to the parasitic 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 increases the bandwidth of the first frequency band without adversely affecting the bandwidth of the second frequency band.
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Coats & Bennett P.L.L.C.
Phan Tho G
Sony Ericsson Mobile Communications AB
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