Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1997-04-04
1999-06-29
Cumming, William
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
343713, H04Q 738
Patent
active
059181621
ABSTRACT:
An antenna unit in which fine antenna characteristic can be obtained when the antenna is contained/pulled out. When the second antenna (9) is contained, the second antenna is electrically disconnected from the feeding circuits (5, 7) by the antenna cover (13), so that only the first antenna (8) operates as antenna. On the other hand, when the second antenna is pulled out, the first antenna is compressed by the antenna stopper element (21) and the electrical length is varied, so that only the second antenna operates as antenna. As a result, fine antenna characteristic can be obtained when the antenna is contained/pulled out.
REFERENCES:
patent: 4340891 (1982-07-01), Phillips
patent: 5170493 (1992-12-01), Roth
Ito Hiroki
Kanayama Yoshiki
Kuroda Shin-ichi
Sato Nobuo
Cumming William
Maioli Jay H.
Sony Corporation
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