Antenna Switching System and Method

Patent metadata

Field	Value
Publication number	US-2016337025-A1
Application number	US-201615223845-A
Country	US
Kind code	A1
Filing date	Jul 29, 2016
Priority date	Feb 17, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

The present invention is applicable to the field of mobile terminals and provides an antenna switching system and method. The antenna switching system includes a radio-frequency transceiver circuit, a primary antenna, and a parasitic antenna, where the primary antenna is connected to the radio-frequency transceiver circuit, and further includes a switch circuit, configured to connect, when the parasitic antenna is used to receive or send a radio-frequency signal, the parasitic antenna and the radio-frequency transceiver circuit. If the parasitic antenna is grounded, the parasitic antenna may be configured to spread a spectrum. In addition, when carrier aggregation is needed, the parasitic antenna is connected to the radio-frequency transceiver circuit, so as to become an independent receive or transmit antenna.

First claim

What is claimed is:

1 . An antenna switching system, comprising:
a radio-frequency transceiver circuit; a primary antenna connected to the radio-frequency transceiver circuit; a parasitic antenna connected to the radio-frequency transceiver circuit; and a switch circuit, configured to connect, in response to the parasitic antenna being used to receive or send a radio-frequency signal and a switching instruction sent by a modem of a mobile terminal being received, the parasitic antenna specified by the switching instruction and the radio-frequency transceiver circuit, and in response to only the primary antenna being used to receive or send a radio-frequency signal, to cut off a connection between the parasitic antenna and the radio-frequency transceiver circuit, and ground the parasitic antenna.

2 . The antenna switching system according to claim 1 , wherein the switch circuit is further configured to ground the parasitic antenna in response to a primary-antenna transceiver instruction being sent by a modem of the mobile terminal is received.

3 . The antenna switching system according to claim 1 , wherein the switch circuit comprises a switch port and an antenna port configured to connect to the parasitic antenna;
wherein the radio-frequency transceiver circuit comprises a second duplexer, a second radio frequency power amplifier, and a radio-frequency transceiver, wherein a receive port of the second duplexer is connected to a second code-division-mode receive port of the radio-frequency transceiver, a second code-division-mode transmit port of the radio-frequency transceiver is connected to a transmit port of the second duplexer after being connected to the second radio frequency power amplifier in series, and an antenna port of the second duplexer is connected to the switch port of the switch circuit; and wherein the switch circuit is further configured to, in response to a frequency band switch instruction sent by the modem of the mobile terminal being received, enable an antenna port of the switch circuit and a switch port that is connected to the antenna port of the second duplexer and that is specified by the frequency band switch instruction.

4 . The antenna switching system according to claim 3 , wherein the radio-frequency transceiver circuit further comprises:
a fourth radio frequency power amplifier and a second surface acoustic wave filter; a second time-division-mode transmit port of the radio-frequency transceiver connected to the switch port of the switch circuit after being connected to the fourth radio frequency power amplifier in series; and a vibration transmit port and a receive port of the second surface acoustic wave filter respectively connected to the switch port of the switch circuit and a second time-division-mode receive port of the radio-frequency transceiver.

5 . The antenna switching system according to claim 4 , wherein the switch circuit is further configured to:
in response to a selection sending instruction sent by the modem of the mobile terminal being received, enable the antenna port of the switch circuit and a switch port that is connected to the fourth radio frequency power amplifier and that is specified by the selection sending instruction; and in response to a selection receiving instruction sent by the modem of the mobile terminal being received, enable the antenna port of the switch circuit and a vibration transmit port of the second surface acoustic wave filter specified by the selection receiving instruction.

6 . The antenna switching system according to claim 1 , wherein the radio-frequency transceiver circuit further comprises:
a first duplexer; a first radio frequency power amplifier; a third radio frequency power amplifier; a first surface acoustic wave filter; and a single-pole multi-throw switch device; wherein a receive port of the first duplexer is connected to a first code-division-mode receive port of a radio-frequency transceiver, and a first code-division-mode transmit port of the radio-frequency transceiver is connected to a transmit port of the first duplexer after being connected to the first radio frequency power amplifier in series; wherein an antenna port of the first duplexer is connected to a switch port of the single-pole multi-throw switch device, and an antenna port of the single-pole multi-throw switch device is connected to the primary antenna; wherein a first time-division-mode transmit port of the radio-frequency transceiver is connected to the switch port of the single-pole multi-throw switch device after being connected to the third radio frequency power amplifier in series; and wherein a vibration transmit port and a receive port of the first surface acoustic wave filter are respectively connected to the switch port of the single-pole multi-throw switch device and a first time-division-mode receive port of the radio-frequency transceiver.

7 . The antenna switching circuit according to claim 6 , the single-pole multi-throw switch device is configured to: in response to a switch instruction sent by a modem of the mobile terminal being received, enable the antenna port of the single-pole multi-throw switch device and a switch port that is connected to the antenna port of the first duplexer and that is specified by the switch instruction.

8 . The antenna switching circuit according to claim 6 , the single-pole multi-throw switch device is configured to, in response to a switch instruction sent by a modem of the mobile terminal being received, enable the antenna port of the single-pole multi-throw switch device and a switch port that is connected to the third radio frequency power amplifier and that is specified by the switch instruction.

9 . The antenna switching circuit according to claim 6 , the single-pole multi-throw switch device is configured to, in response to a switch instruction sent by a modem of the mobile terminal being received, enable the antenna port of the single-pole multi-throw switch device and a switch port that is connected to the first surface acoustic wave filter and that is specified by the switch instruction.

10 . The antenna switching system according to claim 1 , wherein a quantity of the parasitic antennas is P, wherein P is a positive integer, and a quantity of the primary antennas is M, wherein M is a positive integer, and wherein the switch circuit is configured to connect, in response to the parasitic antenna being used to receive or send a radio-frequency signal, the parasitic antenna and the radio-frequency transceiver circuit comprises: in response to N channels of radio-frequency signals in different frequency bands needing to be received or sent, K switch circuits are used to separately establish connections between K parasitic antennas and the radio-frequency transceiver circuit, wherein M is obtained by subtracting K from N, N is a positive integer greater than 1, and P is greater than or equal to K.

11 . The antenna switching system according to claim 10 , wherein the switch circuit is configured to ground a parasitic antenna, which is not connected to the radio-frequency transceiver circuit, of the P parasitic antennas.

12 . An antenna switching method comprising:
in response to a modem of a mobile terminal receiving a multichannel prompt sent by a base station, generating, by the modem, a switching instruction according to the multichannel prompt, and sending the switching instruction to a switch circuit; and establishing, by the switch circuit, a connection between a parasitic antenna specified by the switching instruction and a radio-frequency transceiver circuit.

13 . The antenna switching method ac

Assignees

• Huawei Device Co Ltd

Inventors

• Xu Qiuliang
• Yang Liping
• Zhang Changfeng
• Chen Zhijun

Classifications

• H04W4/06

  Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services · CPC title

• H01Q3/24

  varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching · CPC title

• H01Q1/243 Primary

  with built-in antennas · CPC title

• H01Q1/48

  Earthing means; Earth screens; Counterpoises · CPC title

• H01Q5/378

  Combination of fed elements with parasitic elements · CPC title