Dual-bandwidth cellular telephone switching apparatus

Details Dual-bandwidth cellular telephone switching apparatus Dual-bandwidth cellular telephone switching apparatus

1995-08-24

1996-12-10

Kuntz, Curtis

Telecommunications

Transmitter and receiver at same station

With a common signal processing stage

455266, 4552001, 455343, H04B 138

Patent

active

055840566

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.

REFERENCES:
patent: 4903335 (1990-02-01), Shimizu
patent: 4972455 (1990-11-01), Phillips et al.
patent: 4987317 (1991-01-01), Pournain et al.
patent: 5023939 (1991-05-01), Hori
patent: 5280636 (1994-01-01), Kelley et al.
patent: 5437051 (1995-07-01), Oto
patent: 5497507 (1996-03-01), Komaki

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