Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1997-02-24
1999-06-01
Kuntz, Curtis A.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 83, 455562, 333103, 333104, H04Q 700, H01P 110
Patent
active
059096411
ABSTRACT:
A transmit/receive switch includes a first quarter-wavelength transmission line coupled between an antenna port and a first variable impedance device. The first variable impedance device is coupled between the first quarter-wavelength transmission line and a signal common node. An impedance of the first variable impedance device is controllable variable between a low impedance value and a high impedance value. A second quarter-wavelength transmission line is coupled between first variable impedance device and a first port. A third quarter-wavelength transmission line is coupled between the antenna port and a second variable impedance device. The second variable impedance device is coupled between the third quarter-wavelength transmission line and the signal common node. Like the first variable impedance device, an impedance of the second variable impedance device is controllable variable between a low impedance value and a high impedance value. A fourth quarter-wavelength transmission line is coupled between the second variable impedance device and a second port.
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AT&T Wireless Services Inc.
Gelin Jean A.
Kuntz Curtis A.
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