Full-duplex antenna and mobile terminal

• US 10,003,123 B2
• Filed: 04/22/2016
• Issued: 06/19/2018
• Est. Priority Date: 12/19/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Zhang, Junping, Yang, Zhice, Zhang, Qian
• Primary Examiner(s): Nguyen, Hoang
• Application Number:
  US15/135,830
• Publication Number:
  US 20160240912A1
• Time in Patent Office: 788 Days
• CPC Class Codes: H01Q 1/24 with receiving set
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/52 Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure absorbing means H01Q17/00
• CPC Class Codes: H01Q 1/525 between emitting and receiving antennas
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

A full-duplex antenna includes a receive antenna, which is an omnidirectional antenna. A first transmit antenna is disposed on one side of the receive antenna and is a directional antenna. A reverse direction of a main lobe of a radiation pattern of the first transmit antenna points to the receive antenna. A second transmit antenna is disposed on the other side of the receive antenna. A distance between the second transmit antenna and the receive antenna is equal to a distance between the first transmit antenna and the receive antenna. The second transmit antenna is a directional antenna, and a reverse direction of a main lobe of a radiation pattern of the second transmit antenna points to the receive antenna.

Claims

1. A full-duplex antenna, comprising:

a receive antenna;

a first transmit antenna disposed on a first side of the receive antenna, wherein the first transmit antenna is a directional antenna and wherein a reverse direction of a main lobe of a radiation pattern of the first transmit antenna points to the receive antenna; and

a second transmit antenna disposed on a second side of the receive antenna, the second side opposite the first side, wherein a distance between the second transmit antenna and the receive antenna is equal to a distance between the first transmit antenna and the receive antenna, wherein the second transmit antenna is a directional antenna, and wherein a reverse direction of a main lobe of a radiation pattern of the second transmit antenna points to the receive antenna;

wherein a first polarization direction in which the receive antenna receives a signal transmitted by the first transmit antenna and a second polarization direction in which the receive antenna receives a signal transmitted by the second transmit antenna are perpendicular to each other.

2. The full-duplex antenna according to claim 1, further comprising a signal generator, wherein a first output end of the signal generator is connected to the first transmit antenna by a first conducting wire, wherein a second output end of the signal generator is connected to the second transmit antenna by a second conducting wire, and wherein the signal generator is configured to generate two channels of transmit signals having the same amplitude and reverse phases and to separately send the two channels of transmit signals to the first transmit antenna and the second transmit antenna.

3. The full-duplex antenna according to claim 2, wherein the first conducting wire and the second conducting wire have an equal length.

4. The full-duplex antenna according to claim 2, further comprising a digital interference canceller, which is configured to cancel interference signals received by the receive antenna from the first transmit antenna and the second transmit antenna.

5. The full-duplex antenna according to claim 4, wherein the full-duplex antenna comprises multiple groups of receive and transmit channels, wherein each group of receive and transmit channel comprises a respective receive antenna, a respective first transmit antenna, a respective second transmit antenna, and a respective signal generator, wherein a first end of the digital interference canceller is configured to receive a receive signal that is output by the respective receive antenna in each group, a second end of the digital interference canceller is configured to output a transmit signal to the respective signal generator that is in each group, and distances from the respective first transmit antenna and the respective second transmit antenna that are in the same group of receive and transmit channel to any receive antenna are the same.

6. The full-duplex antenna according to claim 4, further comprising an analog-to-digital converter, wherein a first end of the analog-to-digital converter is connected to the receive antenna, and a second end of the analog-to-digital converter is connected to the digital interference canceller, the analog-to-digital converter being configured to convert an analog receive signal received by the receive antenna into a digital receive signal and to send the digital receive signal to the digital interference canceller.

7. The full-duplex antenna according to claim 4, further comprises a digital-to-analog converter, wherein a first end of the digital-to-analog converter is connected to the signal generator, and a second end of the digital-to-analog converter is connected to the digital interference canceller, the digital-to-analog converter being configured to convert a digital transmit signal sent by the digital interference canceller into an analog transmit signal and to send the analog transmit signal to the signal generator.

8. The full-duplex antenna according to claim 1, wherein the radiation pattern of the first transmit antenna has no side lobe and wherein the second transmit antenna has no side lobe.

9. The full-duplex antenna according to claim 1, wherein the full-duplex antenna is configured to implement omnidirectional radiation after a direction of the main lobe of the radiation pattern of the first transmit antenna and a direction of the main lobe of the radiation pattern of the second transmit antenna are overlapped, wherein the omnidirectional radiation enables a transmit signal to be received in any direction of 360 degrees.

10. A mobile terminal, comprising a full-duplex antenna that comprises:

a receive antenna;

a first transmit antenna disposed on a first side of the receive antenna, wherein the first transmit antenna is a directional antenna and wherein a reverse direction of a main lobe of a radiation pattern of the first transmit antenna points to the receive antenna; and

a second transmit antenna, disposed on a second side of the receive antenna, the second side opposite the first side, wherein a distance between the second transmit antenna and the receive antenna is equal to a distance between the first transmit antenna and the receive antenna, wherein the second transmit antenna is a directional antenna, and wherein a reverse direction of a main lobe of a radiation pattern of the second transmit antenna points to the receive antenna;

wherein a first polarization direction in which the receive antenna receives a signal transmitted by the first transmit antenna and a second polarization direction in which the receive antenna receives a signal transmitted by the second transmit antenna are perpendicular to each other.

11. The mobile terminal according to claim 10, further comprising a signal generator, wherein a first output end of the signal generator is connected to the first transmit antenna by a first conducting wire, wherein a second output end of the signal generator is connected to the second transmit antenna by a second conducting wire, and wherein the signal generator is configured to generate two channels of transmit signals having the same amplitude and reverse phases and to separately send the two channels of transmit signals to the first transmit antenna and the second transmit antenna.

12. The mobile terminal according to claim 11, wherein the first conducting wire and the second conducting wire have an equal length.

13. The mobile terminal according to claim 11, further comprising a digital interference canceler, which is configured to cancel interference signals received by the receive antenna from the first transmit antenna and the second transmit antenna.

14. The mobile terminal according to claim 13, wherein the full-duplex antenna comprises multiple groups of receive and transmit channels, wherein each group of receive and transmit channel comprises a respective receive antenna, a respective first transmit antenna, a respective second transmit antenna, and a respective signal generator, wherein a first end of the digital interference canceller is configured to receive a receive signal that is output by the respective receive antenna in each group, a second end of the digital interference canceller is configured to output a transmit signal to the respective signal generator that is in each group, and distances from the respective first transmit antenna and the respective second transmit antenna that are in the same group of receive and transmit channel to any receive antenna are the same.

15. The mobile terminal according to claim 13, further comprising an analog-to-digital converter, wherein a first end of the analog-to-digital converter is connected to the receive antenna, and a second end of the analog-to-digital converter is connected to the digital interference canceller, the analog-to-digital converter being configured to convert an analog receive signal received by the receive antenna into a digital receive signal and to send the digital receive signal to the digital interference canceller.

16. The mobile terminal according to claim 13, further comprises a digital-to-analog converter, wherein a first end of the digital-to-analog converter is connected to the signal generator, and a second end of the digital-to-analog converter is connected to the digital interference canceller, the digital-to-analog converter being configured to convert a digital transmit signal sent by the digital interference canceller into an analog transmit signal and to send the analog transmit signal to the signal generator.

17. The mobile terminal according to claim 10, wherein the radiation pattern of the first transmit antenna has no side lobe and wherein the second transmit antenna has no side lobe.

18. The mobile terminal according to claim 10, wherein the full-duplex antenna is configured to implement omnidirectional radiation after a direction of the main lobe of the radiation pattern of the first transmit antenna and a direction of the main lobe of the radiation pattern of the second transmit antenna are overlapped, wherein the omnidirectional radiation enables a transmit signal to be received in any direction of 360 degrees.

19. A full-duplex antenna, comprising:

a receive antenna;

a first transmit antenna disposed on a first side of the receive antenna, wherein the first transmit antenna is a directional antenna and wherein a reverse direction of a main lobe of a radiation pattern of the first transmit antenna points to the receive antenna; and

a second transmit antenna disposed on a second side of the receive antenna, the second side opposite the first side, wherein a distance between the second transmit antenna and the receive antenna is equal to a distance between the first transmit antenna and the receive antenna, wherein the second transmit antenna is a directional antenna, and wherein a reverse direction of a main lobe of a radiation pattern of the second transmit antenna points to the receive antenna;

wherein the radiation pattern of the first transmit antenna has no side lobe and wherein the second transmit antenna has no side lobe.

20. A full-duplex antenna, comprising:

a receive antenna;

a first transmit antenna disposed on a first side of the receive antenna, wherein the first transmit antenna is a directional antenna and wherein a reverse direction of a main lobe of a radiation pattern of the first transmit antenna points to the receive antenna; and

a second transmit antenna disposed on a second side of the receive antenna, the second side opposite the first side, wherein a distance between the second transmit antenna and the receive antenna is equal to a distance between the first transmit antenna and the receive antenna, wherein the second transmit antenna is a directional antenna, and wherein a reverse direction of a main lobe of a radiation pattern of the second transmit antenna points to the receive antenna;

wherein the full-duplex antenna is configured to implement omnidirectional radiation after a direction of the main lobe of the radiation pattern of the first transmit antenna and a direction of the main lobe of the radiation pattern of the second transmit antenna are overlapped, wherein the omnidirectional radiation enables a transmit signal to be received in any direction of 360 degrees.