Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1997-06-23
1998-09-29
Urban, Edward F.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455575, 455129, H04B 140
Patent
active
058158057
ABSTRACT:
A portable radio transceiver (100) includes a transmitter (101) and a receiver (103) operating at different respective frequencies. The transmitter (101) is capable of producing an undesired signal (121) including a frequency substantially equal to the receiver operating frequency (107). A first antenna (102) is coupled to the transmitter (101). A second antenna (104) is coupled to the receiver (103) and electrically isolated (122) from the first antenna (102) by a predetermined degree such that the undesired signal (121) received by the second antenna (104) is attenuated by the predetermined degree of electrical isolation (122). An optional filter (112), coupled to an input terminal of an amplifier (113) in the transmitter (101), is adapted to attenuate the undesired signal (121) such that the undesired signal (121) received by the second antenna (104) is further attenuated. An optional directional attenuator (115), coupled between the amplifier (113) and the first antenna (102), is adapted to attenuate an interfering signal (123) received by the first antenna (102) such that the undesired signal (121) received by the second antenna (104) is further attenuated.
REFERENCES:
patent: 3891926 (1975-06-01), Ishman et al.
patent: 4233607 (1980-11-01), Sanford et al.
patent: 4384363 (1983-05-01), Lipcon
patent: 4475243 (1984-10-01), Batlivala et al.
patent: 4561111 (1985-12-01), Conner
patent: 4823133 (1989-04-01), Anflo et al.
patent: 4897863 (1990-01-01), Newland
patent: 4952193 (1990-08-01), Talwar
patent: 5014346 (1991-05-01), Phillips et al.
patent: 5212815 (1993-05-01), Schumacher
patent: 5230093 (1993-07-01), Rich et al.
Dyna TAC Cellular Mobile Telephone Instruction Manual, May 1, 1986, Motorola Inc. Communications Sector.
Dyna TAC Cellular Mobile Telephone Instruction Manual, 1985, Motorola Inc. Communications Sector.
Crnkovic James John
Kim Jin Dong
Kaschke Kevin D.
Motorola Inc.
Urban Edward F.
LandOfFree
Apparatus and method for attenuating an undesired signal in a ra does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for attenuating an undesired signal in a ra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for attenuating an undesired signal in a ra will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-697326