CN111884671A

CN111884671A - Radio frequency circuit and electronic device

Info

Publication number: CN111884671A
Application number: CN202010773013.8A
Authority: CN
Inventors: 冯文; 杨正淼
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2020-08-04
Filing date: 2020-08-04
Publication date: 2020-11-03
Also published as: WO2022028303A1

Abstract

The application discloses radio frequency circuit and electronic equipment belongs to the technical field of communication. The radio frequency circuit comprises a radio frequency transceiver, a combiner, a first path, a second path and a first antenna unit; the radio frequency transceiver comprises a first transmission port and a second transmission port; the combiner is provided with a first input end, a second input end and an output end; the first transmitting port is connected with the first input end of the combiner through a first path, the second transmitting port is connected with the second input end of the combiner through a second path, and the output end of the combiner is connected with the first antenna unit; the isolation between the first input end and the second input end is greater than or equal to the frequency band isolation between the first path and the second path. In this application, by providing the combiner in the radio frequency circuit, since the isolation degree of the combiner is greater than or equal to the frequency band isolation degree between the first path and the second path, the radio frequency signals of the two paths can simultaneously pass through the combiner without mutual influence.

Description

Radio frequency circuit and electronic device

Technical Field

The application belongs to the technical field of communication, and particularly relates to a radio frequency circuit and electronic equipment.

Background

With the development of communication technology, the radio frequency circuits of electronic devices such as mobile phones and tablets need to be compatible with different standards, so the radio frequency circuits of the electronic devices generally have at least two different paths, for example, one path is used for internet communication, and the other path is used for voice communication. However, when at least two different paths are operating simultaneously, the performance of each path may be affected as compared to when a single path is operating.

Disclosure of Invention

An object of the embodiments of the present application is to provide a radio frequency circuit and an electronic device, which can solve the problem that the performance of each path is affected when multiple paths in the radio frequency circuit simultaneously operate.

In order to solve the technical problem, the present application is implemented as follows:

in a first aspect, an embodiment of the present application provides a radio frequency circuit, including a radio frequency transceiver, a combiner, a first path, a second path, and a first antenna unit;

the radio frequency transceiver comprises a first transmission port and a second transmission port; the combiner has a first input terminal, a second input terminal and an output terminal; the first transmitting port is connected with a first input end of the combiner through the first path, the second transmitting port is connected with a second input end of the combiner through the second path, and an output end of the combiner is connected with the first antenna unit;

the isolation between the first input end and the second input end is greater than or equal to the frequency band isolation between the first path and the second path.

In a second aspect, an embodiment of the present application provides an electronic device, which includes the radio frequency circuit described in the first aspect.

In the embodiment of the application, by arranging the combiner in the radio frequency circuit, since the isolation degree of the combiner is greater than or equal to the frequency band isolation degree between the first path and the second path, radio frequency signals of the two paths can simultaneously pass through the combiner without mutual influence. Therefore, the radio frequency circuit in the embodiment of the application can realize simultaneous operation of multiple channels, and the performance of each channel cannot be influenced.

Drawings

Fig. 1 is a schematic structural diagram of a radio frequency circuit provided in an embodiment of the present application;

fig. 2 is one of schematic diagrams illustrating an operating principle of a radio frequency circuit according to an embodiment of the present application;

fig. 3 is a second schematic diagram illustrating an operating principle of the rf circuit according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.

The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and the claims means at least one of connected objects, and a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The radio frequency circuit and the electronic device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.

As shown in fig. 1, a radio frequency circuit includes a radio frequency transceiver 1, a combiner 2, a first path 3, a second path 4, and a first antenna unit 5;

the radio frequency transceiver 1 comprises a first transmission port 11 and a second transmission port 12; the combiner 2 has a first input 21, a second input 22 and an output 23; the first transmitting port 11 is connected with a first input end 21 of the combiner 2 through a first path 3, the second transmitting port 12 is connected with a second input end 22 of the combiner 2 through a second path 4, and an output end 23 of the combiner 2 is connected with the first antenna unit 5;

the isolation between the first input 21 and the second input 22 is greater than or equal to the band isolation between the first path 3 and the second path 4.

The rf transceiver 1 may also be called a radio frequency chip (WTR).

The combiner 2 may be a three-port device, with one end (i.e., the first input port 21) connected to the first path 3, one end (i.e., the second input port 22) connected to the second path 4, and a common end (i.e., the output port 23) connected to the antenna (i.e., the first antenna element 5).

The first Antenna unit 5 may include two Antenna interfaces (ANT), ANT1 and ANT 2.

A Double Pole Double Throw (DPDT) switch may be further disposed in the rf circuit, and the output terminal 23 of the combiner 2 may be connected to the ANT1 and the ANT2 through the DPDT switch.

In order to improve the frequency coverage of the radio frequency circuit, the radio frequency circuit generally includes a Low Band (LB or L-Band) path, a Middle Band (MB or M-Band) path, and a high Band (HB or H-Band) path. Thus, the radio frequency circuit may comprise a third via 6 in addition to the first via 3 and the second via 4 described above. Correspondingly, the radio frequency transceiver 1 may further include a third transmitting port 13, the third transmitting port 13 may be connected to the third path 6, and the radio frequency circuit may further include a second antenna unit (not shown) connected to the third path 6.

In view of high reliability of the intermediate frequency band path and the high frequency band path in communication performance, the first path 3 and the second path 4 may be set as the intermediate frequency band path and the high frequency band path, respectively, that is, the first path 3 is the intermediate frequency band path, the second path 4 is the high frequency band path, and the third path 6 may be set as the low frequency band path.

Since the isolation between the first input end 21 and the second input end 22 of the combiner 2 is greater than or equal to the frequency band isolation between the first path 3 and the second path 4, the radio frequency signals of the first path 3 and the second path 4 can both pass through the combiner 2 without mutual influence. Specifically, in the case where the first path 3 is an intermediate frequency band path and the second path 4 is a high frequency band path, the combiner 2 may exhibit a low-pass characteristic for the first path 3 to the first antenna element 5, and the combiner 2 may exhibit a band-pass characteristic for the second path 4 to the first antenna element 5. Use first route 3 to carry out voice conversation, second route 4 surfs the net as the example, first route 3 and second route 4 are opened simultaneously, because combiner 2 has very high isolation, both do not influence each other to can realize voice conversation and surf the net simultaneously, and then can improve user experience.

As an example, the isolation between the first input terminal 21 and the second input terminal 22 of the combiner 2 may be greater than or equal to 15 dB.

In order to simplify the overall structure of the rf circuit, it may be considered that the third path 6 is connected in parallel with the first path 3 and is commonly connected to the first input terminal 21 of the combiner 2, so that the third path 6 may also be connected to the first antenna element 5 through the combiner 2 without separately providing a second antenna element for the third path 6.

In order to achieve the above-described aspects, specific embodiments are provided below.

Optionally, the radio frequency circuit further includes a third path 6 and a first switch 7; the third transmitting port 13 of the radio frequency transceiver 1 is connected to the third path 6, a plurality of input ends of the first switch 7 are respectively connected to the first path 3 and the third path 6, an output end of the first switch 7 is connected to the first input end 21 of the combiner 2, and the first switch 7 is configured to control the combiner 2 to be conducted with the first path 3 or with the third path 6.

In this embodiment, the combiner 2 may adopt an LMH combiner, one end of the combiner 2 is connected to a low-mid frequency band (LM-band for short) (i.e., the first path 3 or the third path 6), one end is connected to an H-band path (i.e., the second path 4), and the common end is connected to the first antenna unit 5. The combiner 2 exhibits a low-pass characteristic for the LM-band path to the first antenna element 5 and a band-pass characteristic for the H-band path to the first antenna element 5.

In this embodiment, the first path 3 and the third path 6 are commonly connected to the combiner 2 through the first switch 7, so that not only the first path 3 and the second path 4 can work simultaneously, but also the third path 6 and the second path 4 can work simultaneously, thereby further improving the working performance of the radio frequency circuit.

Optionally, the radio frequency circuit further includes a first coupler 8, an input end of the first coupler 8 is connected to the first path 3, a first output end of the first coupler 8 is connected to the first input end 21 of the combiner 2, and a second output end (i.e., the CPL _ LM port in fig. 1) of the first coupler 8 is connected to the radio frequency transceiver 1.

In this embodiment, by providing the first coupler 8, the operating performance of the first path 3 can be improved, and thus the operating performance of the radio frequency circuit can be improved.

Further, for the embodiment where the first path 3 and the third path 6 are commonly connected to the combiner 2 through the first switch 7, the first path 3 and the third path 6 may be commonly connected to the first coupler 8 through the first switch 7, and then connected to the combiner 2 through the first coupler 8. In this way, a coupler need not be separately provided for the third path 6, thereby further simplifying the overall structure of the radio frequency circuit.

Optionally, the radio frequency circuit further includes a second coupler 9, an input end of the second coupler 9 is connected to the second path 4, a first output end of the second coupler 9 is connected to the second input end 22 of the combiner 2, and a second output end (i.e., the CPL _ H port in fig. 1) of the second coupler 9 is connected to the radio frequency transceiver 1.

In this embodiment, the second coupler 9 is provided, so that the operating performance of the second path 4 can be improved, and the operating performance of the radio frequency circuit can be improved.

It should be noted that the first coupler 8 and the second coupler 9 have a port for connecting a load in addition to the input terminal and the output terminal, which is not specifically described.

Optionally, the first path 3 includes a second switch 31, a third switch (not shown in the figure), a first branch 33 and a second branch 34;

the input end of the second switch 31 is connected to the first transmitting port 11, the output end of the second switch 31 is connected to the input ends of the first branch 33 and the second branch 34, the input end of the third switch is connected to the output ends of the first branch 33 and the second branch 34, the output end of the third switch is connected to the first input end 21 of the combiner 2, and the second switch 31 and the third switch are used for controlling the conduction of the combiner 2 and one of the first branch 33 and the second branch 34.

Optionally, the second path 4 includes a fourth switch 41, a fifth switch 42, a third branch 43 and a fourth branch 44;

an input end of the fourth switch 41 is connected to the second transmitting port 12, an output end of the fourth switch 41 is connected to input ends of the third branch 43 and the fourth branch 44, an input end of the fifth switch 42 is connected to output ends of the third branch 43 and the fourth branch 44, an output end of the fifth switch 42 is connected to the second input end 22 of the combiner 2, and the fourth switch 41 and the fifth switch 42 are configured to control the combiner 2 to be connected to one of the third branch 43 and the fourth branch 44.

Further, for the embodiment in which the first path 3 and the third path 6 are commonly connected to the combiner 2 through the first changeover switch 7, the third changeover switch may be replaced by the first changeover switch 7.

Optionally, the third path 6 includes a sixth switch 61, a fifth branch 62 and a sixth branch 63;

an input end of the sixth switch 61 is connected to the third transmitting port 13, an output end of the sixth switch 61 is connected to input ends of the fifth branch 62 and the sixth branch 63, the first switch 7 includes four input ends, two input ends of the first switch 7 are connected to output ends of the fifth branch 62 and the sixth branch 63, the other two input ends of the first switch 7 are connected to output ends of the first branch 33 and the second branch 34, and the first switch 7 is configured to control the combiner 2 to be connected to one of the first branch 33, the second branch 34, the fifth branch 62 and the sixth branch 63.

In the above embodiment in which two branches are provided in each path, the number of branches provided in each path is not limited to two, and may be more, which is not limited in this application.

The multiple branches in the above paths correspond to different frequency bands (bands), for example, two branches in the first path 3 may be B1 and B3, two branches in the second path 4 may be B7 and B41, and two branches in the third path 6 may be B5 and B8.

Through the arrangement of the plurality of branches in each channel, the radio frequency circuit can take various frequency bands into consideration, and therefore the working performance of the radio frequency circuit can be improved.

In addition to the above, each path may be provided with a device such as a power amplifier, a filter, or a duplexer, for example, the power amplifier in the first path 3 may be an MB power amplifier (i.e., an LTE intermediate frequency power amplifier), the power amplifier in the second path 4 may be an HB power amplifier (i.e., an LTE high frequency power amplifier), and the power amplifier in the third path 6 may be an LB power amplifier (i.e., an LTE low frequency power amplifier).

Optionally, the first path 3 is a 4G MB path;

the second path 4 is a 4G HB path or a 5G new air interface NR path, or the second path 4 is a path shared by the 4G HB and the 5G NR.

Optionally, the second path 4 is a path shared by the 4G HB and an independent networking (standard, SA for short).

The second path 4 may be a path common to the 4G HB path and the SA N41 path, for example.

When the SA N41TX1 path and the SA N41TX2 path are provided in the radio frequency circuit, the second path 4 may be a path common to the 4G HB path and the SA N41TX2 path. In this way, the radio frequency circuit may also provide a fourth path 10, namely the SA N41TX1 path. Correspondingly, the radio frequency circuit further includes a third antenna element, which may include two antenna ports, i.e., ANT3 and ANT4 shown in fig. 1, and the radio frequency transceiver 1 further includes a fourth transmitting port 14, and one end of the fourth path 10 is connected to the fourth transmitting port 14 and the other end is connected to the third antenna element. Further, the other end of the fourth path 10 may be connected to the ANT3 and ANT4 through DPDT. In addition, the fourth circuit 10 may also be provided with devices such as a power amplifier (i.e., an N41 power amplifier), a switch, a filter, or a duplexer, which will not be specifically described.

For better understanding of the embodiments of the present application, two specific examples are provided below by taking as an example a radio frequency architecture in which SA N412T 4R and 4G LM-band communicate simultaneously. As shown in fig. 2, the first path 3 is a 4G MB path, the second path 4 is a path common to SA N41TX2 and 4G HB, the third path 6 is a 4G LB path, and the fourth path 10 is a SA N41TX1 path.

Example one:

as shown in fig. 2, taking SA N412T 4R surfing the internet and 4G B3 conversation as an example, the two are opened simultaneously as follows:

4G B3 path is opened, and 1T2R communication is realized;

an SA N41TX2 path and an SA N41TX1 path are opened, and 2T4R communication is realized;

SA N41 and 4G B3 work simultaneously, because the combiner 2 has very high isolation, both do not influence each other, SA N41 keeps 2T4R, need not switch to 1T2R, can realize 4G voice communication under the condition that 5G throughput does not descend, can improve user experience.

As shown in fig. 3, taking the implementation of 4G LM + H band downlink CA (Carrier aggregation) and uplink CA functions as an example, the case where both 4G B3 and 4G B41 are simultaneously turned on is as follows:

4G B3 path is opened, and 1T2R communication is realized;

4G B41 path is opened, and 1T2R communication is realized;

4G B41 and 4G B3 transmit simultaneously and realize ascending CA, receive simultaneously and realize descending CA, because combiner 2 has very high isolation, the mutual influence between two passways of 4G B41 and 4G B3 is negligible, provide ascending CA and descending CA function, compare single access and open, CA radio frequency performance can not appear worsening, or said, receiving sensitivity can not descend.

It should be noted that various optional implementations in the embodiments of the present application may be implemented in combination with each other or separately, and the present application is not limited thereto.

An embodiment of the present application further provides an electronic device, which includes any one of the radio frequency circuits in the above embodiments.

The electronic device in the embodiment of the present application may be a mobile electronic device, and may also be a non-mobile electronic device. By way of example, the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palm top computer, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and the non-mobile electronic device may be a server, a Network Attached Storage (NAS), a Personal Computer (PC), a Television (TV), a teller machine or a self-service machine, and the like, and the embodiments of the present application are not particularly limited.

The electronic device in the embodiment of the present application may be an apparatus having an operating system. The operating system may be an Android operating system (Android), an iOS operating system, or other possible operating systems, which is not specifically limited in the embodiments of the present application.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may include performing functions in a substantially simultaneous manner or in a reverse order depending on the functionality involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A radio frequency circuit is characterized by comprising a radio frequency transceiver, a combiner, a first path, a second path and a first antenna unit;

2. The radio frequency circuit according to claim 1, further comprising a third path and a first switch;

the radio frequency transceiver further comprises a third transmitting port, the third transmitting port is connected with the third path, a plurality of input ends of the first switch are respectively connected with the first path and the third path, an output end of the first switch is connected with a first input end of the combiner, and the first switch is used for controlling the combiner to be conducted with the first path or with the third path.

3. The radio frequency circuit according to claim 1 or 2, wherein the first path is an intermediate frequency band (MB) path and the second path is a high frequency band (HB) path.

4. The radio frequency circuit of claim 3, wherein the first path is a 4G MB path;

the second path is a 4G HB path or a 5G new air interface NR path, or the second path is a path shared by the 4G HB and the 5G NR.

5. The RF circuit of claim 4, wherein the second path is a path shared by a 4G HB and an independent networking SA.

6. The radio frequency circuit of claim 2, wherein the third path is a low frequency band LB path.

7. The rf circuit according to claim 1 or 2, further comprising a first coupler, wherein an input of the first coupler is connected to the first path, a first output of the first coupler is connected to the first input of the combiner, and a second output of the first coupler is connected to the rf transceiver.

8. The rf circuit of claim 1, further comprising a second coupler, an input of the second coupler being connected to the second path, a first output of the second coupler being connected to the second input of the combiner, and a second output of the second coupler being connected to the rf transceiver.

9. The radio frequency circuit of claim 1, wherein the first path comprises a second switch, a third switch, a first branch, and a second branch;

the input end of the second switch is connected to the first transmitting port, the output end of the second switch is connected to the input ends of the first branch and the second branch, the input end of the third switch is connected to the output ends of the first branch and the second branch, the output end of the third switch is connected to the first input end of the combiner, and the second switch and the third switch are used for controlling the combiner to be connected to one of the first branch and the second branch.

10. An electronic device comprising the radio frequency circuit of any one of claims 1 to 9.