Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1987-08-28
1990-04-03
Moskowitz, Nelson
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455133, 455140, 455277, H04B 144
Patent
active
049147145
ABSTRACT:
A portable radio communication apparatus includes a first antenna that can extend away from, or be retracted towards, an apparatus housing. The apparatus includes a second, usually flat antenna mounted within or around the outer periphery of the housing. When the first antenna is extended away from the housing, it is connected via a switch to a node, in turn, connected via respective filters to both a transmitter and a diversity receiver. At this time, the second antenna is connected to the diversity receiver via a respective filter. When the first antenna is sufficiently retracted towards the housing, a switch, mechanically coupled to the first antenna, disconnects the first antenna from the node, connects the second antenna to such node, and disconnects the second antenna from the diversity receiver.
REFERENCES:
patent: 4566133 (1986-01-01), Rambo
patent: 4756023 (1988-07-01), Kojima
Moskowitz Nelson
NEC Corporation
Sotomayor John B.
LandOfFree
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