Systems and Methods for Leak Suppression in a Full Duplex System

• US 20160105272A1
• Filed: 10/13/2015
• Published: 04/14/2016
• Est. Priority Date: 10/14/2014
• Status: Abandoned Application

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Griffiths, James Gary, Oberhammer, Wolfgang, Wu, Huan, Hum, Eddy Shi-Ning
• Application Number:
  US14/882,047
• Publication Number:
  US 20160105272A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance
• CPC Class Codes: H04B 1/00 Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
• CPC Class Codes: H04B 1/0458 Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages matching circuits in general H03H
• CPC Class Codes: H04B 1/18 Input circuits, e.g. for coupling to an antenna or a transmission line coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex

Abstract

A system and method for leak suppression in a full duplex system is disclosed. In an embodiment, a system for wireless transmission and reception includes a circulator having a common port, an input port and an output port; a conjugate matching tuner coupled to the common port; and an antenna coupled to the conjugate matching tuner, an impedance of the antenna being conjugate matched to an impedance of the common port of the circulator by the conjugate matching tuner.

Claims

1. A system for wireless transmission and reception, comprising:

a circulator having a common port, an input port and an output port;

a conjugate matching tuner coupled to the common port; and

an antenna coupled to the conjugate matching tuner, an impedance of the antenna being conjugate matched to an impedance of the common port of the circulator by the conjugate matching tuner.

2. The system of claim 1, further comprising:

a transmitter coupled to the input port of the circulator; and

a receiver coupled to the output port of the circulator, wherein the transmitter and the receiver are configured for full duplex transmission and reception.

3. The system of claim 1, wherein the conjugate matching tuner comprises a voltage standing wave ratio (VSWR) tuner.

4. The system of claim 1, wherein the conjugate matching tuner comprises one of a stub tuner, a sliding stub tuner, a double stub tuner, and a triple stub tuner.

5. A network component, comprising:

a circulator comprising an input port, a output port, and a common port;

a transmitter connected to the input port of the circulator;

a voltage standing wave ratio (VSWR) tuner comprising a first port and a second port, the first port connected to the common port of the circulator;

a receiver connected to the output port of the circulator; and

an antenna connected to the second port of the VSWR tuner,

wherein the VSWR tuner substantially minimizes a leak of a transmission signal into the receiver.

6. The network component of claim 5, wherein the VSWR substantially conjugately matches an impedance of the circulator with an impedance of the antenna.

7. The network component of claim 5, wherein the VSWR is dynamically adjustable.

8. The network component of claim 5, wherein the VSWR comprises one of a stub tuner, a sliding stub tuner, a double stub tuner, and a triple stub tuner.

9. The network component of claim 5, wherein the transmitter and the receiver are configured for full duplex transmission and reception.

10. A method for manufacturing a full duplex system;

the method comprising;

connecting a first port of a conjugate matching tuner to a common port of a circulator; and

connecting a second port of the conjugate matching tuner to an antenna, an impedance of the antenna being conjugate matched to an impedance of the common port of the circulator by the conjugate matching tuner.

11. The method of claim 10, further comprising:

connecting a transmitter to an input port of the circulator.

12. The method of claim 10, further comprising:

connecting a receiver to an output port of the circulator.

13. The method of claim 10, further comprising:

connecting an output of a vector network analyzer (VNA) to an input port of the circulator;

connecting an input of the VNA to an output port of the circulator;

sweeping the input port of the circulator with the VNA; and

adjusting the conjugate matching tuner for minimum transmission at the output port during the sweeping, thereby conjugate matching the antenna and the common port of the circulator.

14. The method of claim 10, wherein the conjugate matching tuner comprises a voltage standing wave ratio (VSWR) tuner.

15. The method of claim 10, wherein the conjugate matching tuner comprises one of a stub tuner, a sliding stub tuner, a double stub tuner, and a triple stub tuner.

16. A method for transmitting and receiving a signal in a full duplex wireless device, the method comprising:

transmitting a transmitted signal to an input port of a circulator having a common port, the input port and an output port; and

conjugately matching an impedance of the common port of the circulator with an impedance of an antenna thereby reducing reflection of the transmitted signal appearing at the output port of the circulator.

17. The method of claim 16, wherein conjuagely matching the impedance of the common port of the circulator with the antenna is accomplished using a conjugate matching tuner placed between the common port of the circulator and the antenna.

18. The method of claim 17, wherein the conjugate matching tuner comprises a voltage standing wave ratio (VSWR) tuner.

19. The method of claim 17, wherein the conjugate matching tuner comprises one of a stub tuner, a sliding stub tuner, a double stub tuner, and a triple stub tuner.