Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-06-10
2000-01-11
Trost, William G.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455553, 455132, 455131, 455303, 455314, 455141, 455209, 455143, 4552401, H04B 138, H04B 104, H04B 1702, H04B 110
Patent
active
060145714
ABSTRACT:
A multiband mobile unit communication apparatus comprises: antennas for receiving plural radio wave SIGs respectively transmitted from plural mobile unit communication systems, the plurality of radio wave SIGs having different carrier frequencies respectively; independent CKTs for generating IF SIGs from the radio wave SIGs from the antennas respectively; and a common CKT including a switch according to a mode SIG, a quadrature demodulation CKT for directly converting the IF SIG from the switch into I and Q baseband SIGs, and a decoding CKT for outputting a decoding result from said I and Q baseband SIGs. In accordance with the mode SIG, power is selectively supplied to the independent CKTs, a switchable FRQ-divider may be provided to FRQ-dividing a LO SIG for the quadrature demodulation CKT, a switchable tuning CKT may be provided to the variable gain amplifying CKT to provide a switchable tuning FRQ, switchable low-pass filters may be provided to switchably low-pass-filter the I and Q baseband SIGs. The variable gain amplifier may be an analog type or a digital type. An antenna diversity receiving may be provided.
REFERENCES:
patent: 5239697 (1993-08-01), Kosuga
patent: 5280636 (1994-01-01), Kelley et al.
patent: 5333176 (1994-07-01), Burke et al.
patent: 5437051 (1995-07-01), Oto
patent: 5564076 (1996-10-01), Auvray
patent: 5752169 (1998-05-01), Hareyama et al.
patent: 5758266 (1998-05-01), Kornfeld et al.
patent: 5822704 (1998-10-01), Ishii
Legree Tracy M.
Matsushita Electric - Industrial Co., Ltd.
Trost William G.
LandOfFree
Multiband mobile unit communication apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multiband mobile unit communication apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiband mobile unit communication apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1469234