CN111082816B - Radio frequency front-end circuit and terminal - Google Patents
Radio frequency front-end circuit and terminal Download PDFInfo
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- CN111082816B CN111082816B CN201911327224.2A CN201911327224A CN111082816B CN 111082816 B CN111082816 B CN 111082816B CN 201911327224 A CN201911327224 A CN 201911327224A CN 111082816 B CN111082816 B CN 111082816B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—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
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—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
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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Abstract
The embodiment of the application discloses a radio frequency front-end circuit and a terminal, and relates to the field of communication. The main antenna and one of the plurality of antenna wires are controlled to be connected through the single-pole multi-throw switch so as to adjust and change antenna parameters of the main antenna, so that the main antenna can be suitable for different application scenes, multiplexing of antennas of different types is realized, and the problem that a clearance area inside a terminal is small due to the fact that the plurality of antennas need to be arranged in the related technology is solved.
Description
Technical Field
The present invention relates to the field of antennas, and in particular, to a radio frequency front end circuit and a terminal.
Background
With the increase of the functions of the mobile phone, the number of antennas arranged in the mobile phone is more and more, for example: the mobile phone sets different radio frequency antennas according to different application scenarios, for example: in the related art, in order to transmit radio frequency signals of multiple frequencies, multiple antennas need to be correspondingly arranged in a mobile phone, because the current mobile phone is increasingly pursuing light and thin, the clearance Area of each antenna in the terminal is increasingly smaller due to the fact that the numerous antennas are increased, and how to ensure that the interference degree among the multiple antennas is smaller in a limited space is an urgent problem to be solved at present.
Disclosure of Invention
The radio frequency front-end circuit and the terminal provided by the embodiment of the application can solve the problem that a plurality of antennas arranged in the terminal in the related art have large interference. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides a radio frequency front-end circuit, including:
the antenna comprises a main antenna, M antenna wires, an antenna switch, a controller, a radio frequency circuit and an antenna matching network; the antenna switch is a single-pole multi-throw switch and is provided with 1 control end, 1 movable end and M immovable ends, and the M immovable ends and the M antenna wires are connected in a one-to-one mode; the controller is connected with the control end of the antenna switch, the radio frequency circuit is connected with the feed point through the antenna matching network, and the lengths of the M antenna wires are unequal;
the controller is used for generating a switch control signal and sending the switch control signal through the antenna switch at the control end;
the antenna switch is used for receiving a switch control signal from the controller through the control end and controlling the movable end to be connected with one of the M immovable ends according to the switch control signal so as to connect one of the M antenna wires with the main body antenna;
the radio frequency circuit is used for generating a radio frequency signal and transmitting the radio frequency signal to the main antenna through the feed point.
In one possible design, the main antenna is a bottom frame of the terminal, and a breakpoint is provided between the bottom frame and the two side frames.
In one possible design, the distance between the feed point and the switch load point is 1cm to 2 cm.
In one possible design, the polarization directions of the 4 antenna traces are perpendicular to each other.
In one possible design, an antenna matching circuit includes: the first inductor, the second inductor and the first capacitor; the output end of the radio frequency circuit is connected with one end of the first inductor, the other end of the first inductor is connected with the output end of the radio frequency circuit through the second inductor, and the other end of the first inductor is connected with the feed point of the main antenna through the first capacitor.
In one possible design, an antenna matching circuit includes: a third inductor, a second capacitor and a third capacitor; the output end of the radio frequency circuit is connected with one end of the third inductor, and the output end of the radio frequency circuit is connected with the feed point of the main antenna through the second capacitor; the other end of the third inductor is connected with the output end of the radio frequency circuit, and the other end of the third inductor is connected with the feed point of the main antenna through the third capacitor.
In one possible design, the location of the ground point on the body antenna is related to the antenna trace selected by the antenna switch.
In a second aspect, an embodiment of the present application provides a terminal, including the above radio frequency front-end circuit.
The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:
the terminal is provided with main part antenna and a plurality of antenna and walks the line, a plurality of antenna are walked the line and are had different length in order to realize different operating frequency and polarization direction, it links to each other to walk one of line through single-pole multiple-throw switch control main part antenna and a plurality of antenna to adjust the operating frequency and the polarization direction that change the main part antenna, so main part antenna can be suitable for different application scenarios, realize the multiplexing of the antenna of different grade type, solve the inside headroom regional less problem of terminal that needs to set up the antenna of a plurality of different operating frequencies among the correlation technique.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an rf front-end circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an antenna matching network provided by an embodiment of the present invention;
fig. 4 is a circuit diagram of an antenna matching network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic diagram of an rf front-end circuit according to an embodiment of the present invention includes: the antenna comprises a main antenna 1, an antenna switch 2, antenna wires 31-3M, a controller 4, a radio frequency circuit 5 and an antenna matching network 6, wherein M is an integer greater than 1. The M antenna wires have different working frequencies, and the shapes, impedances and polarization directions of the M antenna wires can be the same. The main antenna 1 includes a feeding point 11, a switch loading point 12 and a grounding point 13, the feeding point 11 is a port of the main antenna 1 for transmitting radio frequency signals, the grounding point 13 is a port of the main antenna 1 for grounding, and the switch loading point 12 is a port of the main antenna 1 connected to the main antenna 1. Antenna switch 2 is a single-pole multi-throw switch, and antenna switch 2 is provided with 1 movable end, M motionless ends and 1 control end, and M motionless ends and M antenna are walked and are adopted one-to-one mode to be connected, and different motionless ends link to each other with different antenna wiring, and antenna switch 2 is walked through switching movable end and one motionless end in the M motionless ends and is linked to each other, realizes selecting one antenna of M antenna wiring to walk and link to each other with main part antenna 1.
The controller 4 is configured to generate a switch control signal and send the switch control signal to the antenna switch 2; the controller 4 may be implemented in at least one hardware form of a Digital Signal Processing (DSP), a field-programmable gate Array (FPGA), and a Programmable Logic Array (PLA). The switch control signal may be a digital pulse signal, and the controller 4 uses the code of the digital pulse signal to control the connection of the moving terminal and the different stationary terminals in the single-pole multi-throw switch. For example: the code of the digital pulse signal is 1000, and the movable end is controlled to be connected with the fixed end 1; the code of the digital pulse signal is 0100, and the movable end is controlled to be connected with the immovable end 2; the code of the digital pulse signal is 0010, and the movable end is controlled to be connected with the fixed end 3; the code of the digital pulse signal is 0001, and the control movable end is connected with the fixed end 4.
The antenna switch 2 is used for receiving a switch control signal from the controller 4 through a control end, controlling the movable end to be connected with any one of the M immovable ends according to the switch control signal, coupling the main antenna 1 and the selected antenna wire in an electrical connection mode, and using the main antenna 1 and the selected antenna wire as a radiator to transmit radio-frequency signals outwards; when the movable end is suspended, that is, the movable end is not connected to any of the M immovable ends, the main antenna 1 itself serves as a radiator to emit radio frequency signals. When the main body antenna 1 is connected with one of the M antenna wires, the antenna parameters (impedance, length, working frequency, polarization direction and the like) of the M antenna wires are different from those of the main body antenna, the main body antenna and the antenna wires form a radiator, and the radiator changes the antenna parameters such as impedance, polarization direction and the like relative to the main body antenna, so that different antenna wires can be selected to be combined with the main body antenna according to different application scenes, and the effect of adaptively adjusting the antenna parameters of the antenna is realized. The antenna matching network 6 is used for performing impedance matching on the radiator formed by the main antenna 1 and the selected antenna wire, so that the radiator can reach the maximum transmitting power under different working frequencies, and the transmitting efficiency of the antenna is improved.
And the radio frequency circuit 5 is used for generating a radio frequency signal and transmitting the radio frequency signal to the main body antenna 1 through the feeding point. The radio frequency circuit can transmit radio frequency signals through the main antenna 1, and can also receive radio frequency signals sent by other equipment through the main antenna 1.
According to the radio frequency front-end circuit provided by the invention, the terminal is provided with the main antenna and the plurality of antenna wires, the plurality of antenna wires have different lengths so as to realize different working frequencies and polarization directions, and the main antenna is controlled to be connected with one of the plurality of antenna wires through the single-pole multi-throw switch so as to adjust and change the working frequency and the polarization direction of the main antenna, so that the main antenna can be suitable for different application scenes, the multiplexing of different types of antennas is realized, and the problem that the clearance area inside the terminal is smaller due to the fact that the plurality of antennas with different working frequencies need to be arranged in the related technology is solved.
In a possible implementation, the middle frame of the terminal includes two top frames, two side frames and a bottom frame, the middle frame is made of metal, the main antenna is the bottom frame, a break point is arranged between the bottom frame and the two side frames, namely, a gap is arranged between the bottom frame and the two side frames, and the size of the gap can be set according to actual requirements.
For example, referring to fig. 2, the middle frame of the terminal includes a side frame 200, a side frame 209, and a bottom frame 210, the antenna body is the bottom frame 210, a break point 211 is provided between the bottom frame 210 and the side frame 200, and a break point 212 is provided between the bottom frame 210 and the side frame 209. Side frame 200 and side frame 209 may be grounded.
In one possible embodiment, the distance between the feed point and the switch load point is between 1cm and 2cm, for example: referring to fig. 1, the distance between the feeding point 11 and the switch load point 12 is 1cm, 1.5cm or 2 cm. The distance between the feeding point 11 and the switching load point 12 cannot be too small to avoid interference between the feeding point 11 and the switching load point 12.
In one possible embodiment, M is 4, and the polarization directions of the 4 antenna traces are perpendicular to each other.
For example, referring to fig. 2, the rf front-end circuit includes: the antenna comprises a main body antenna 210, a radio frequency circuit 207, an antenna matching network 208, an antenna trace 201, an antenna trace 202, an antenna trace 203, an antenna trace 204, an antenna switch 205 and a controller 206. The antenna switch 205 is provided with 1 movable end, 4 immovable ends and 1 control end, wherein the 4 immovable ends are respectively connected with the antenna wires 201 to 204, the movable end is connected with the antenna trace 210, and the control end of the antenna switch 205 is connected with the controller 206. The rf circuit 207 is connected to the main antenna 210 through the antenna matching network 208, and the lengths of the antenna traces 201 to 204 are different and the polarization directions are different.
In one possible embodiment, the antenna matching network includes a first inductor, a second inductor, and a first capacitor, wherein the output terminal of the rf circuit is connected to one end of the first inductor, the other end of the first inductor is connected to the feed point of the main antenna through the first capacitor, and the other end of the first inductor is connected to the output terminal of the rf circuit through the second inductor.
For example, referring to the circuit diagram of the antenna matching network shown in fig. 3, the antenna matching network includes a first inductor L1, a second inductor L2, and a first capacitor C1. The output end of the radio frequency circuit is connected with one end of a first inductor L1, the other end of the first inductor L1 is connected with the feed point of the main antenna through a first capacitor C1, and the other end of the first inductor L1 is connected with the output end of the radio frequency circuit through a second inductor L2.
In one possible embodiment, the antenna matching network comprises a third inductor, a second capacitor and a third capacitor; the output end of the radio frequency circuit is connected with one end of the third inductor, the output end of the radio frequency circuit is connected with one end of the second capacitor, the other end of the third inductor is connected with the output end of the radio frequency circuit, the other end of the third inductor is connected with the feed point of the main antenna through the third capacitor, and the other end of the second capacitor is connected with the feed point of the main antenna.
For example, referring to the circuit diagram of the antenna matching network described in fig. 4, the antenna matching network includes a third inductor L3, a second capacitor C2, and a third capacitor C3. The output end of the radio frequency circuit is connected with one end of a third inductor L3, the output end of the radio frequency circuit is connected with one end of a second capacitor C2, the other end of the third inductor L3 is connected with the output end of the radio frequency circuit, the other end of the third inductor L3 is connected with the feed point of the main antenna through the third capacitor C3, and the other end of the second capacitor C2 is connected with the feed point of the main antenna.
Further, be provided with the feed point on the underframe, the underframe because and be provided with the breakpoint between two side frames, consequently the underframe includes main part and two ends, and the distance of feed point to arbitrary one end is greater than the distance in clearance. For example: the length of the bottom frame is 5cm, and the length of the gap is 5mm, then the distance between the feeding point and the two ends of the bottom frame needs to be more than 5 mm.
In one possible embodiment, the position of the ground point on the main antenna is related to the antenna trace selected by the antenna switch. For example: the main body antenna is provided with a plurality of grounding points, the number of the grounding points is equal to the number of the antenna routing, one antenna routing corresponds to one grounding point, and when the antenna switching antenna routing is carried out, the grounding points on the main body antenna are switched accordingly.
An embodiment of the present application further provides a terminal, where the terminal includes: in the rf front-end circuits described in the embodiments of fig. 1 to 4, the number of the rf front-end circuits is one or more.
In a possible implementation manner, the main body antenna is a bottom frame of the terminal, the terminal further includes two side frames, the two side frames are respectively disposed on two sides of the bottom frame, a gap is disposed between the two side frames and the bottom frame, the two side frames are provided with grounding points, and a distance between a position of the grounding point and the bottom frame is greater than a distance of the gap. For example: referring to fig. 2, the bottom frame 210 of the terminal is a main antenna, break points are provided between the bottom frame 210 and the side frames 200 and 209, and the side frames 20 and 30 are grounded.
In one possible embodiment, a ground plate is arranged between the two side frames, and the two side frames and the antenna matching network are grounded through the ground plate. For example: a grounding plate made of metal materials is arranged between the two side edges, and the two side frames and the antenna matching network are grounded through the grounding plate. The grounding plate can be provided with a plurality of openings, and the shape of the plurality of openings can be circular or rectangular.
The working principle and the connection relationship of each component in the terminal can refer to the descriptions of the rf front-end circuit in fig. 1 to fig. 4, which are not described herein again.
The terminal of the embodiment of the application can be a mobile phone, a tablet computer, a wearable device and the like.
According to the terminal provided by the invention, the terminal is provided with the main antenna and the plurality of antenna wires, the plurality of antenna wires have different lengths so as to realize different working frequencies and polarization directions, and the main antenna is controlled to be connected with one of the plurality of antenna wires through the single-pole multi-throw switch so as to adjust and change the working frequency and the polarization direction of the main antenna, so that the main antenna can be suitable for different application scenes, the multiplexing of different types of antennas is realized, and the problem that the clearance area inside the terminal is smaller due to the fact that the plurality of antennas with different working frequencies need to be arranged in the related technology is solved.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A radio frequency front end circuit, comprising: the method comprises the following steps:
the antenna comprises a main antenna, M antenna wires, an antenna switch, a controller, a radio frequency circuit and an antenna matching network; the main antenna is provided with a grounding point, a switch loading point and a feeding point, the antenna switch is a single-pole multi-throw switch, the antenna switch is provided with 1 control end, 1 movable end and M immovable ends, and the M immovable ends and the M antenna wires are connected in a one-to-one mode; the moving end is connected with the switch loading point, the controller is connected with the control end of the antenna switch, the radio frequency circuit is connected with the feed point through the antenna matching network, and the lengths of the M antenna wires are unequal;
the controller is used for generating a switch control signal and sending the switch control signal to the antenna switch through the control end;
the antenna switch is configured to receive a switch control signal from the controller through the control end, and control the movable end to be connected to one of the M immovable ends according to the switch control signal, so that one of the M antenna traces is connected to the main antenna, and the one of the M antenna traces and the main antenna are combined to transmit a radio frequency signal;
the radio frequency circuit is used for generating the radio frequency signal and transmitting the radio frequency signal to the main antenna through the feed point.
2. The rf front-end circuit according to claim 1, wherein the main antenna is a bottom frame of the terminal, and a break point is disposed between the bottom frame and the two side frames.
3. The radio frequency front-end circuit according to claim 1, wherein a distance between the feed point and the switch load point is 1 cm-2 cm.
4. The rf front-end circuit of claim 1, wherein M =4, and the polarization directions of the 4 antenna traces are perpendicular to each other.
5. The rf front-end circuit of claim 1, wherein the antenna matching circuit comprises: the first inductor, the second inductor and the first capacitor; the output end of the radio frequency circuit is connected with one end of the first inductor, the other end of the first inductor is connected with the feed point of the main antenna through the first capacitor, and the other end of the first inductor is connected with the output end of the radio frequency circuit through the second inductor.
6. The rf front-end circuit of claim 1, wherein the antenna matching circuit comprises: a third inductor, a second capacitor and a third capacitor; the output end of the radio frequency circuit is connected with one end of the third inductor, and the output end of the radio frequency circuit is connected with one end of the second capacitor; the other end of the third inductor is connected with the output end of the radio frequency circuit, and the other end of the third inductor is connected with a feed point of the main antenna through the third capacitor; and the other end of the second capacitor is connected with a feed point of the main antenna.
7. The rf front-end circuit of claim 1, wherein a location of the ground point on the body antenna is associated with an antenna trace selected by the antenna switch.
8. A terminal, characterized in that it comprises a radio-frequency front-end circuit according to any one of claims 1 to 7.
9. The terminal of claim 8, further comprising two side frames; the main body antenna is a bottom frame of the terminal, the two side frames are respectively arranged on two sides of the bottom frame, a gap is formed between the two side frames and the bottom frame, grounding points are arranged on the two side frames, and the distance between the grounding points and the bottom frame is larger than the distance between the gaps.
10. A terminal according to claim 9, wherein a ground plane is provided between the two side frames, and the two side frames, the antenna matching network, are grounded through the ground plane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911327224.2A CN111082816B (en) | 2019-12-20 | 2019-12-20 | Radio frequency front-end circuit and terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911327224.2A CN111082816B (en) | 2019-12-20 | 2019-12-20 | Radio frequency front-end circuit and terminal |
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| CN111082816A CN111082816A (en) | 2020-04-28 |
| CN111082816B true CN111082816B (en) | 2021-07-20 |
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| CN201911327224.2A Active CN111082816B (en) | 2019-12-20 | 2019-12-20 | Radio frequency front-end circuit and terminal |
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| CN112713384A (en) * | 2020-12-09 | 2021-04-27 | 宇龙计算机通信科技(深圳)有限公司 | Antenna structure and mobile terminal |
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| CN103475386A (en) * | 2013-09-25 | 2013-12-25 | 小米科技有限责任公司 | Radio frequency front end terminal and terminal equipment |
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| KR101013367B1 (en) * | 2008-04-22 | 2011-02-14 | 삼성전자주식회사 | Portable device, method and system for capability measurement thereof |
| CN104022350B (en) * | 2014-06-12 | 2016-06-08 | 电子科技大学 | There is the intelligent machine antenna of metal edge frame |
| CN106229625A (en) * | 2016-09-09 | 2016-12-14 | 北京小米移动软件有限公司 | Anneta module and electronic equipment |
| CN207588838U (en) * | 2017-12-08 | 2018-07-06 | 无锡中普微电子有限公司 | A kind of antenna rf circuit and radio-frequency unit |
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| CN103475386A (en) * | 2013-09-25 | 2013-12-25 | 小米科技有限责任公司 | Radio frequency front end terminal and terminal equipment |
| CN105305067A (en) * | 2015-10-29 | 2016-02-03 | 维沃移动通信有限公司 | Antenna system and mobile terminal |
| CN105490002A (en) * | 2015-11-28 | 2016-04-13 | 广东欧珀移动通信有限公司 | Antenna device of mobile terminal and mobile terminal |
| CN107069212A (en) * | 2017-01-23 | 2017-08-18 | 瑞声科技（南京）有限公司 | The mobile terminal of antenna assembly and the application antenna assembly |
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