Improved n-plexer
AssigneeForefront RF Ltd
InventorsLeo Laughlin, Michael Guess
Life of this patent
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Abstract
There is disclosed a circuit for transmitting a transmit signal at a transmit frequency and for receiving a signal at a receive frequency, using a common antenna, comprising: a transmit filter connected between a transmit port and an antenna port; a receive filter connected between a receive port and the antenna port; a cancellation circuit connected between the transmit port and the receive port to cancel self-interference between the transmit and receive ports; and a control circuit for modifying the transmit and/or receive filters to improve impedance matching between the antenna port and the transmit filter output and/or the receive port filter input.
Claims32
A circuit for transmitting a transmit signal at a transmit frequency and for receiving a signal at a receive frequency, using a common antenna, comprising:
- a transmit filter connected between a transmit port and an antenna port;
- a receive filter connected between a receive port and the antenna port;
- a cancellation circuit connected between the transmit port and the receive port to cancel self-interference between the transmit and receive ports;
- and
- a control circuit for modifying the transmit and/or receive filters to improve impedance matching between the antenna port and the transmit filter output and/or the receive port filter input.
A method for transmitting a signal at a transmit frequency and for receiving a signal at a receive frequency, using a common antenna, the method comprising:
- filtering a transmit signal received at a transmit port for delivery to an antenna port;
- filtering a receive signal received at the antenna port for delivery to a receive port;
- applying cancellation to cancel self-interference between the transmit and receive ports;
- and
- modifying the filtering of the transmit and/or receive signal to improve impedance matching with the antenna port.
The method claim 154 further comprising measuring a signal at the antenna port, and modifying the transmit and/or the receive filtering to improve the impedance matching in dependence on the signal measured at the antenna port.
A circuit for transmitting and receiving using a common antenna, comprising:
- an adjustable antenna coupling network connecting a transmitter, an antenna, and a receiver;
- a cancellation circuit connected between the transmitter and the receiver, configured to at least partially cancel self-interference;
- and
- a controller configured to modify the antenna coupling network in dependence on a self-interference signal measured at the receiver to improve impedance matching of the antenna.
A method for transmitting and receiving using a common antenna, comprising:
- a connecting a transmit port, an antenna port, and a receive port;
- at least partially cancel received self-interference between the transmitter and the receiver;
- measuring a self-interference signal at the receiver;
- and
- modifying the antenna coupling network to improve impedance matching of the antenna in dependence on the measured self-interference signal.
Dependencies are inferred from the claim text.