Adjustable electronic duplexer
First Claim
1. A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna, the duplexer comprising:
- a transmitter port adapted to receive a transmission signal from the transmission unit;
a receiver port adapted to transmit a reception signal to the reception unit;
an antenna port adapted to transmit the transmission signal to the shared antenna and receive the reception signal from the shared antenna;
a first signal path between said transmitter port and said receiver port;
a filter unit in said first signal path for filtering said reception signal, said filter unit causing a leakage signal to occur between said transmitter port and said receiver port;
a second signal path between said transmitter port and said receiver port; and
a cancellation unit in said second signal path adapted to receive a sample of the transmission signal and produce a compensation signal that is injected into the first signal path to substantially reduce the leakage signal.
2 Assignments
0 Petitions
Accused Products
Abstract
A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna is disclosed. The duplexer comprises a first signal path between the transmission unit and the reception unit, the first signal path comprises a filter unit filtering the reception signal, the filtering unit provides a filtered signal to the reception unit. The duplexer further comprises a second signal path between the transmission unit and the reception unit. The second signal path comprises a cancellation unit which receives a sample of the transmission signal and produces a compensation signal. The injection of the compensation signal to the first signal path reduces the leakage signal, thereby producing a substantially leakage-free reception signal.
39 Citations
14 Claims
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1. A duplexer for a communication device having a transmission unit, a reception unit and a shared antenna, the duplexer comprising:
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a transmitter port adapted to receive a transmission signal from the transmission unit; a receiver port adapted to transmit a reception signal to the reception unit; an antenna port adapted to transmit the transmission signal to the shared antenna and receive the reception signal from the shared antenna; a first signal path between said transmitter port and said receiver port; a filter unit in said first signal path for filtering said reception signal, said filter unit causing a leakage signal to occur between said transmitter port and said receiver port; a second signal path between said transmitter port and said receiver port; and a cancellation unit in said second signal path adapted to receive a sample of the transmission signal and produce a compensation signal that is injected into the first signal path to substantially reduce the leakage signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for interfacing a transmission unit, a reception unit and a shared antenna within a duplexer, the method comprising:
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receiving at a transmitter port a transmission signal from said transmission unit; transmitting said transmission signal to said shared antenna via an antenna port; receiving a reception signal from said shared antenna via said antenna port; filtering said reception signal in a first signal path between said transmitter port and a receiver port, said filtering causing a leakage signal to occur between said transmitter port and said receiver port; sampling said transmission signal and computing a compensation signal having an amplitude substantially equal to the amplitude of said leakage signal and a phase substantially 180-degree shifted from the phase of the leakage signal; and injecting said compensation signal into said first signal path to be added to said reception signal and thereby substantially reduce said leakage signal. - View Dependent Claims (14)
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Specification