Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-11-26
1999-12-21
Chin, Wellington
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455101, 455133, 455115, 455560, H03C 702, H01S 400, H04B 106
Patent
active
06006112&
ABSTRACT:
A wireless base station has a transmitter and receiver. Transmission signals are applied to an antenna through a transmit bandpass filter that is tuned for a transmit band of frequencies. Received signals from the antenna are applied to the receiver through a receive bandpass filter that is tuned for a receive band of frequencies. An RF switching array consisting of four RF switches interconnects the output of the transmitter and the input of the receiver such that normal, loopback (self-test), and scanning modes can be performed. In the normal mode, the antenna is connected to the transmitter and receiver through the transmit and receive bandpass filters, respectively. The transmit and signal paths are effectively isolated from each other by three serially-connected open switches. In the loopback mode, the transmitter output is connected to the receiver input. In the scanning mode, the antenna is connected to the receiver through the transmit bandpass filter. The same set of interconnects provides for loopback and normal operation as well as the new scanning operation. The use of switches rather than couplers or couplers for the loopback function reduces noise and crosstalk between transmit and receive signal lines and lower losses in these lines.
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Rucki John Stanley
Wen Jack
Zappala Christopher F.
Chin Wellington
Lucent Technologies - Inc.
Smith Sheila
LandOfFree
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