| 摘要 |
Vehicle telecommunication apparatus permits sharing of an embedded antenna between an embedded transceiver used for the provision of mobile application services to the vehicle and a portable transceiver used for personal communication by the vehicle operator. Closure of a mobile vehicle use switch, such as a vehicle ignition switch, with the portable transceiver connected to an embedded RF terminal, places an electrically controlled RF switch in an activated condition providing a through connection between the portable transceiver and embedded antenna for transmission and reception and a coupled connection from the embedded antenna for reception by the embedded transceiver. A generated RF signal from the embedded transceiver is coupled to a detector to switch the electrically controlled RF switch to its inactivated condition, in which the portable transceiver is disconnected from the embedded antenna and a through signal path is established between the embedded transceiver and embedded antenna. The inactivated condition of the electrically controlled RF switch is also produced its own failure, by opening the mobile vehicle use switch or by disconnecting the portable transceiver. The antenna sharing provides better reception and transmission in the use of the portable transceiver for calls from the vehicle while allowing the portable transceiver to be removed from the vehicle by the operator for use outside the vehicle with the embedded antenna connected to the embedded transceiver for receipt of mobile application services from a service center.
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