Radio telephone with separate antenna for stand-by mode

Details Radio telephone with separate antenna for stand-by mode Radio telephone with separate antenna for stand-by mode

1997-02-19

1999-12-21

Chin, Wellington

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

455 70, 455129, 455348, H04B 138

Patent

active

060061170

ABSTRACT:
A radio telephone for use in wireless telecommunication has a transmitter/receiver unit (4), a control unit (5), a first antenna (1), the properties of which are optimized for use in stand-by mode, and a second antenna (2), the properties of which are optimized for use during ongoing calls, said second antenna being electrically engageable and disengageable with the transmitter/receiver unit. The radio telephone further has an antenna switch (3), which is arranged to operatively connect the transmitter/receiver unit (4) to either the first antenna (1) or the second antenna (2), said antenna switch supplying the control unit (5) with control signals (7) in response to at least the electrical engagement status of the second antenna. The control unit prevents ingoing as well as outgoing calls from being established, as long as the second antenna according to said control signals is indicated to be electrically disengaged.

REFERENCES:
patent: 4914714 (1990-04-01), Tamura
patent: 5276920 (1994-01-01), Kuisma
patent: 5337061 (1994-08-01), Pye et al.
patent: 5497506 (1996-03-01), Takeyasu
patent: 5554996 (1996-09-01), Chatzipetros
patent: 5640689 (1997-06-01), Rossi
patent: 5649306 (1997-07-01), Vannatta et al.

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