Dual-bandwidth cellular telephone switching apparatus
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United States of America Patent
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Dec 10, 1996
Grant Date -
N/A
app pub date -
Aug 24, 1995
filing date -
Oct 17, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
A dual-bandwidth cellular telephone switching apparatus comprising a signal receiver, the signal receiver including an antenna for receiving radio frequency signals on a field corresponding to frequency bands of at least two different cellular telephone systems, a duplexer for passing a desired frequency band component of output signals from the antenna, a low-noise amplifier for amplifying a feeble signal from the duplexer, a band pass filter for passing a desired frequency band component of an output signal from the low-noise amplifier, a synthesizer for detecting a channel being presently serviced and a mixer for mixing an output signal from the band pass filter with an output signal from the synthesizer to produce an intermediate frequency signal. The dual-bandwidth cellular telephone switching apparatus further comprises a switching section including first and second switching circuits. The first and second switching circuits selectively switch power to the two different cellular telephone systems under control of a central controller to selectively transfer an output signal from the mixer in the signal receiver thereto.
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