Radio Frequency Front-End System, Signal Transmission Control Method, and Mobile Terminal

• US 20170126257A1
• Filed: 03/26/2014
• Published: 05/04/2017
• Est. Priority Date: 03/26/2014
• Status: Active Grant

• Current Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Inventors: Wang, Hongyu, Xu, Qiuliang, Yang, Liping, Xu, Jia, Liu, Zhigang, Liu, Zhenyu, Che, Xiang
• Granted Patent: US 9,948,328 B2
• Time in Patent Office: Days
• CPC Class Codes: H01Q 1/243 with built-in antennas
• CPC Class Codes: H01Q 1/521 reducing the coupling between adjacent antennas
• CPC Class Codes: H01Q 5/00 Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements combinations of separate active antenna units operating in different wavebands and connected to a common feeder system H01Q21/30
• CPC Class Codes: H01Q 5/314 using frequency dependent circuits or components, e.g. trap circuits or capacitors
• CPC Class Codes: H04B 1/0057 using diplexing or multiplexing filters for selecting the desired band
• CPC Class Codes: H04B 1/006 using switches for selecting the desired band H04B1/0057 takes precedence
• CPC Class Codes: H04B 1/0064 with separate antennas for the more than one band H04B1/0053 takes precedence
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus

Abstract

Embodiments disclose a radio frequency front-end system and a signal transmission control method. The system includes a first antenna, a second antenna, a first radio frequency circuit, a second radio frequency circuit, and a controller. The controller is configured to acquire a transmission frequency band selected by the first radio frequency circuit, and when a frequency in the transmission frequency band selected by the first radio frequency circuit is less than a preset frequency, to control the first radio frequency circuit to connect to the second antenna. The controller is further configured to disconnect a connection between the second radio frequency circuit and the second antenna, or to maintain an open circuit state between the second radio frequency circuit and the second antenna.

Claims

1-13. -13. (canceled)

14. A radio frequency front-end system, comprising:

a first antenna;

a second antenna;

a first radio frequency circuit;

a second radio frequency circuit; and

a controller, configured to;

acquire a transmission frequency band selected by the first radio frequency circuit; and

when a frequency in the transmission frequency band selected by the first radio frequency circuit is less than a preset frequency, control the first radio frequency circuit to connect to the second antenna, and to disconnect a connection between the second radio frequency circuit and the second antenna, or to maintain an open circuit state between the second radio frequency circuit and the second antenna.

15. The radio frequency front-end system according to claim 14, wherein the controller is further configured to:

when the frequency in the transmission frequency band selected by the first radio frequency circuit is greater than or equal to the preset frequency, control the first radio frequency circuit to connect to the first antenna.

16. The radio frequency front-end system according to claim 15, further comprising:

a first gating circuit, configured to form a connection between a working circuit of the first radio frequency circuit and the controller; and

a second gating circuit, configured to form a connection between a working circuit of the second radio frequency circuit and the controller;

wherein the working circuit of the first radio frequency circuit corresponds to one of a plurality of frequency bands that are supported by the first radio frequency circuit;

wherein the working circuit of the second radio frequency circuit corresponds to one of a plurality of frequency bands that are supported by the second radio frequency circuit; and

the controller is configured to;

acquire a frequency band corresponding to the working circuit of the first radio frequency circuit; and

when a frequency in the frequency band corresponding to the working circuit of the first radio frequency circuit is less than the preset frequency, control the working circuit of the first radio frequency circuit to connect to the second antenna, and to disconnect a connection between the working circuit of the second radio frequency circuit and the second antenna, or to maintain an open circuit state between the working circuit of the second radio frequency circuit and the second antenna.

17. The radio frequency front-end system according to claim 16, wherein the first gating circuit is a first single-pole multi-throw switch, a movable end of the first single-pole multi-throw switch is connected to the controller, k non-movable ends of the first single-pole multi-throw switch are respectively connected to k working circuits of the first radio frequency circuit, and the k working circuits are working circuits corresponding to i frequency bands that are supported by the first radio frequency circuit, wherein i and k are both positive integers, and i is greater than or equal to k, and wherein when i is greater than k, at least two frequency bands that are supported by the first radio frequency circuit correspond to a same working circuit;

and

wherein the second gating circuit is a second single-pole multi-throw switch, a movable end of the second single-pole multi-throw switch is connected to the controller, m non-movable ends of the second single-pole multi-throw switch are respectively connected to m working circuits of the second radio frequency circuit, and the m working circuits are working circuits corresponding to n frequency bands that are supported by the second radio frequency circuit, wherein m and n are both positive integers, n is greater than or equal to m, and wherein when n is greater than m, at least two frequency bands that are supported by the second radio frequency circuit correspond to a same working circuit.

18. The radio frequency front-end system according to claim 17, wherein the controller comprises a first single-pole double-throw switch, a second single-pole double-throw switch, and a controller;

wherein a movable end of the first single-pole double-throw switch is connected to the movable end of the first single-pole multi-throw switch, the k non-movable ends of the first single-pole multi-throw switch are respectively connected to the k working circuits of the first radio frequency circuit, and the k working circuits correspond to the i frequency bands that are supported by the first radio frequency circuit, wherein i and k are both positive integers, and i is greater than or equal to k, and wherein when i is greater than k, the at least two frequency bands that are supported by the first radio frequency circuit correspond to the same working circuit;

wherein a first non-movable end of the first single-pole double-throw switch is connected to the first antenna, and a second non-movable end of the first single-pole double-throw switch is connected to a first non-movable end of the second single-pole double-throw switch;

wherein a movable end of the second single-pole double-throw switch is connected to the second antenna, a second non-movable end of the second single-pole double-throw switch is connected to the movable end of the second single-pole multi-throw switch, the m non-movable ends of the second single-pole multi-throw switch are respectively connected to the m working circuits of the second radio frequency circuit, and the m working circuits are the working circuits corresponding to the n frequency bands that are supported by the second radio frequency circuit, wherein m and n are both positive integers, and n is greater than or equal to m, and wherein when n is greater than m, the at least two frequency bands that are supported by the second radio frequency circuit correspond to the same working circuit; and

the controller is configured to acquire the transmission frequency band selected by the first radio frequency circuit, and when the frequency in the transmission frequency band is less than the preset frequency, to connect the movable end and the second non-movable end of the first single-pole double-throw switch, and to connect the movable end and the first non-movable end of the second single-pole double-throw switch.

19. The radio frequency front-end system according to claim 18, wherein the controller is further configured to:

when the frequency in the transmission frequency band is greater than or equal to the preset frequency, connect the movable end and the first non-movable end of the first single-pole double-throw switch.

20. A method in a radio frequency front-end system, wherein the radio frequency front-end system comprises a first antenna, a second antenna, a first radio frequency circuit, a second radio frequency circuit, and a controller, and the method comprises:

acquiring, by the controller, a transmission frequency band selected by the first radio frequency circuit; and

determining, by the controller, whether a frequency in the transmission frequency band is less than a preset frequency, and when the frequency in the transmission frequency band is less than the preset frequency, controlling the first radio frequency circuit to connect to the second antenna, and to disconnecting a connection between the second radio frequency circuit and the second antenna, or maintaining an open circuit state between the second radio frequency circuit and the second antenna.

21. The method according to claim 20, further comprising:

when the controller determines that the frequency in the transmission frequency band selected by the first radio frequency circuit is greater than or equal to the preset frequency, controlling the first radio frequency circuit to connect to the first antenna.

22. The method according to claim 20, further comprising:

controlling a first gating circuit to form a connection between a working circuit of the first radio frequency circuit and the controller; and

controlling a second gating circuit to form a connection between a working circuit of the second radio frequency circuit and the controller, wherein the working circuit of the first radio frequency circuit corresponds to one of a plurality of frequency bands that are supported by the first radio frequency circuit, and the working circuit of the second radio frequency circuit corresponds to one of a plurality of frequency bands that are supported by the second radio frequency circuit.

23. The method according to claim 22, wherein the first gating circuit is a first single-pole multi-throw switch, a movable end of the first single-pole multi-throw switch is connected to the controller, k non-movable ends of the first single-pole multi-throw switch are respectively connected to k working circuits of the first radio frequency circuit, and the k working circuits correspond to i frequency bands that are supported by the first radio frequency circuit, wherein i and k are both positive integers, and i is greater than or equal to k, and wherein when i is greater than k, at least two frequency bands that are supported by the first radio frequency circuit correspond to a same working circuit;

and

wherein the second gating circuit is a second single-pole multi-throw switch, a movable end of the second single-pole multi-throw switch is connected to the controller, m non-movable ends of the second single-pole multi-throw switch are respectively connected to m working circuits of the second radio frequency circuit, and the m working circuits correspond to n frequency bands that are supported by the second radio frequency circuit, wherein m and n are both positive integers, and n is greater than or equal to m, and wherein when n is greater than m, at least two frequency bands that are supported by the second radio frequency circuit correspond to a same working circuit.

24. The method according to claim 23, wherein the controller comprises a first single-pole double-throw switch, a second single-pole double-throw switch, and a controller;

wherein a movable end of the first single-pole double-throw switch is connected to the movable end of the first single-pole multi-throw switch, the k non-movable ends of the first single-pole multi-throw switch are respectively connected to the k working circuits of the first radio frequency circuit, and the k working circuits correspond to the i frequency bands that are supported by the first radio frequency circuit, wherein i and k are both positive integers, and i is greater than or equal to k, and wherein when i is greater than k, the at least two frequency bands that are supported by the first radio frequency circuit correspond to the same working circuit;

wherein a first non-movable end of the first single-pole double-throw switch is connected to the first antenna, and a second non-movable end of the first single-pole double-throw switch is connected to a first non-movable end of the second single-pole double-throw switch;

wherein a movable end of the second single-pole double-throw switch is connected to the second antenna, a second non-movable end of the second single-pole double-throw switch is connected to the movable end of the second single-pole multi-throw switch, the m non-movable ends of the second single-pole multi-throw switch are respectively connected to the m working circuits of the second radio frequency circuit, and the m working circuits correspond to the n frequency bands that are supported by the second radio frequency circuit, wherein m and n are both positive integers, and n is greater than or equal to m, and wherein when n is greater than m, the at least two frequency bands that are supported by the second radio frequency circuit correspond to the same working circuit; and

wherein the controller determining whether the frequency in the transmission frequency band is less than the preset frequency, and when the frequency in the transmission frequency band is less than the preset frequency, the controlling the first radio frequency circuit to connect to the second antenna, and the disconnecting a connection between the second radio frequency circuit and the second antenna, or the maintaining an open circuit state between the second radio frequency circuit and the second antenna comprises;

when the frequency in the transmission frequency band is less than the preset frequency, connecting, by the controller, the movable end and the second non-movable end of the first single-pole double-throw switch, and connecting the movable end and the first non-movable end of the second single-pole double-throw switch.

25. The method according to claim 24, further comprising:

when the frequency in the transmission frequency band is less than the preset frequency, connecting, by the controller, the movable end and the first non-movable end of the first single-pole double-throw switch.

26. A mobile terminal, comprising the radio frequency front-end system according to claim 20.