HYBRID-BASED CANCELLATION IN PRESENCE OF ANTENNA MISMATCH

• US 20150236842A1
• Filed: 02/17/2015
• Published: 08/20/2015
• Est. Priority Date: 02/14/2014
• Status: Active Grant

• Current Assignee: University of Southern California
• Original Assignee: University of Southern California
• Inventors: Goel, Ankush, Analui, Behnam, Hashemi, Hossein
• Granted Patent: US 10,615,949 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03H 7/463 Duplexers
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04B 1/58 Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

A multi-port hybrid-based cancellation network may include a first and second hybrid coupler, and a first and second two-port network. The second hybrid coupler may be distinct from the first hybrid coupler. The first two-port network may include a first filter connected between the first and the second hybrid couplers. The second two-port network may include a second filter that is distinct from but essentially the same as the first filter connected between the first and the second hybrid couplers. Other circuitry components may be connected to one of the ports of multi-port hybrid-based cancellation network. These other circuitry components may have a configuration that increases or maximizes signal isolation between at least two of the ports of the multi-port hybrid-based cancellation network.

Claims

1. A multi-port hybrid-based cancellation network comprising

a first hybrid coupler;

a second hybrid coupler that is distinct from the first hybrid coupler;

a first two-port network connected between the first and the second hybrid couplers;

a second two-port network that is distinct from, but essentially similar to the first two-port network, connected between the first and the second hybrid couplers;

a third two-port network that is distinct from the first and the second two-port networks connected to the first hybrid coupler; and

one or more other circuit components, at least one of which is connected to at least one port of one of the hybrid couplers or the two-port networks in a configuration that;

reduce a signal reflection coefficient in at least one of the ports of the multi-port hybrid-based cancellation network;

or

increase signal isolation between at least two of the ports of the multi-port hybrid-based cancellation network.

2. The multi-port hybrid-based cancellation network of claim 1 wherein one or more of the one or more other circuit components have a value that varies as a function of changes in the impedance that is presented to one of the ports of the multi-port hybrid-based cancellation network.

3. The multi-port hybrid-based cancellation network of claim 1 wherein the one or more other circuit components have a tunable transfer function.

4. The multi-port hybrid-based cancellation network of claim 3 wherein the tunable transfer function can be adjusted to minimize the signal reflection coefficient or maximize the signal isolation.

5. The multi-port hybrid-based cancellation network of claim 4 wherein the tunable transfer function is automatically adjusted by one or more additional circuitry components.

6. The multi-port hybrid-based cancellation network of claim 3 wherein the tunable transfer function can be adjusted based on a sensed condition.

7. The multi-port hybrid-based cancellation network of claim 6 wherein the sensed condition includes noise.

8. The multi-port hybrid-based cancellation network of claim 1 wherein the one or more other circuitry components include one or more variable or fixed attenuators.

9. The multi-port hybrid-based cancellation network of claim 1 wherein the one or more other circuitry components include one or more variable or fixed phase shifters.

10. The multi-port hybrid-based cancellation network of claim 1 wherein the one or more other circuitry components include one or more variable or fixed delay elements.

11. The multi-port hybrid-based cancellation network of claim 1 wherein the one or more other circuitry components include an impedance matching network.

12. The multi-port hybrid-based cancellation network of claim 1 wherein the one or more other circuit components reduce the signal reflection coefficient.

13. The multi-port hybrid-based cancellation network of claim 12 wherein at least one of the hybrid couplers, the two-port networks, or the one or more other circuitry components can be adjusted to reduce the signal reflection coefficient.

14. The multi-port hybrid-based cancellation network of claim 1 wherein the one or more other circuit components increase signal isolation.

15. The multi-port hybrid-based cancellation network of claim 14 wherein at least one of the hybrid couplers, the two-port networks, or the one or more other circuitry components can be adjusted to increase the signal isolation.

16. The multi-port hybrid-based cancellation network of claim 1 wherein at least one of the two-port networks is tunable.

17. The multi-port hybrid-based cancellation network of claim 1 wherein the multi-port hybrid-based cancellation network operates effectively within multiple frequency bands.

18. The multi-port hybrid-based cancellation network of claim 1 wherein at least some of the one or more other circuit components, the hybrid couples, and the two-port networks are part of a single integrated circuit.

19. The multi-port hybrid-based cancellation network of claim 1 wherein at least some of the one or more other circuit components, the hybrid couples, and the two-port networks are part of a single substrate.

20. The multi-port hybrid-based cancellation network of claim 1 wherein the multi-port hybrid-based cancellation network includes a port having a configuration that is appropriate to connect to a transmitter, a port having a configuration that is appropriate to connect to a receiver, and a port having a configuration that is appropriate to connect to an antenna.

21. The multi-port hybrid-based cancellation network of claim 20 wherein the one or more other circuit components reduce the signal reflection coefficient of the port that is appropriate to connect to the antenna.

22. The multi-port hybrid-based cancellation network of claim 20 wherein the one or more other circuit components increase the signal isolation between the port that is appropriate to connect to the receiver and the port that is appropriate to connect to the transmitter.

23. The multi-port hybrid-based cancellation network of claim 1 wherein all or some of the components are integrated with a receiver, a transmitter, or a transceiver.