Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2006-11-28
2006-11-28
Cumming, William D. (Department: 2617)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
Reexamination Certificate
active
07142824
ABSTRACT:
An antenna device corresponds to a plurality of radio communications systems and frequency bands, can simultaneously carry out a reception and a transmission of different radio communications systems, and is capable of using antenna diversity by a simple construction. An antenna device comprises a first antenna matching with first, second, and third frequency bands, a second antenna matching with the third frequency band, a diplexer and the like. For signals of the first frequency band, a high-frequency switch circuit connects a transmitter or a receiver to the diplexer by switching. For signals of the second frequency band, an additional high-frequency switch connects a receiver or a transmitter to the diplexer by switching. For signals of the third frequency band, the additional high-frequency switch circuit and a further additional high-frequency switch circuit connect the second antenna or diplexer to a transmitter/receiver by switching.
REFERENCES:
patent: 2005/0277387 (2005-12-01), Kojima et al.
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Kojima Noriharu
Watanabe Hideki
Cumming William D.
Matsushita Electric - Industrial Co., Ltd.
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