Passive leakage cancellation networks for duplexers and coexisting wireless communication systems
First Claim
1. A radio frequency duplexer comprising:
- three terminals designated to as a common terminal, a first frequency terminal for a signal in a first frequency band, and a second frequency terminal for a signal in a second frequency band;
a first passive filter in a path connecting the common terminal and the first frequency terminal;
a second passive filter in a path connecting the common terminal and the second frequency terminal;
a first passive feed-forward canceller in a path connecting the first frequency terminal and the second frequency terminal;
a second passive feed-forward canceller in a path connecting the second frequency terminal and the first frequency terminal;
wherein;
the first passive filter has a passband that includes the first frequency band and a stopband that includes the second the frequency band; and
the second passive filter has a passband that includes the second frequency band and a stopband that includes the first frequency band; and
the first passive feed-forward canceller enhances the isolation between the first frequency terminal and the second frequency terminal at the second frequency band; and
the second passive feed-forward canceller enhances the isolation between the first frequency terminal and the second frequency terminal at the first frequency band.
1 Assignment
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Accused Products
Abstract
A passive cancellation network may include a transmit input having a configuration that passively receives a transmit signal from a transmitter that is to be wirelessly transmitted; a transmit output having a configuration that passively delivers the transmit signal after processing by the passive cancellation network; a receive input having a configuration that passively receives a receive signal that includes undesirable leakage from the transmit signal; a receive output having a configuration that passively delivers the receive signal after processing by the passive cancellation network; and a passive feed forward cancellation circuit that passively cancels at least a portion of the undesired leakage from the transmit signal in the receive signal in a feed forward manner.
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Citations
9 Claims
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1. A radio frequency duplexer comprising:
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three terminals designated to as a common terminal, a first frequency terminal for a signal in a first frequency band, and a second frequency terminal for a signal in a second frequency band; a first passive filter in a path connecting the common terminal and the first frequency terminal; a second passive filter in a path connecting the common terminal and the second frequency terminal; a first passive feed-forward canceller in a path connecting the first frequency terminal and the second frequency terminal; a second passive feed-forward canceller in a path connecting the second frequency terminal and the first frequency terminal; wherein; the first passive filter has a passband that includes the first frequency band and a stopband that includes the second the frequency band; and the second passive filter has a passband that includes the second frequency band and a stopband that includes the first frequency band; and the first passive feed-forward canceller enhances the isolation between the first frequency terminal and the second frequency terminal at the second frequency band; and the second passive feed-forward canceller enhances the isolation between the first frequency terminal and the second frequency terminal at the first frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification