CN108598705B

CN108598705B - Antenna system and related product

Info

Publication number: CN108598705B
Application number: CN201810258634.5A
Authority: CN
Inventors: 黄泽纬
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2018-03-27
Filing date: 2018-03-27
Publication date: 2021-02-19
Anticipated expiration: 2038-03-27
Also published as: CN108598705A

Abstract

The embodiments of the present application disclose an antenna system and related products, the antenna system includes: an antenna radiator, a high-frequency signal source, a low-frequency signal source, a first capacitor, a second capacitor, a first selection switch, and four tuning A point on the left end of the antenna radiator is connected to one end of the first capacitor, the other end of the first capacitor is connected to one end on one side of the first selection switch, and point B on the right end of the antenna radiator is connected point is connected to one end of the second capacitor, the other end of the second capacitor is connected to the other end of one side of the first selection switch, and the two ends of the other side of the first selection switch are respectively connected to the high frequency signal source and the low frequency signal source. The technical solution provided by the present application has the advantage of high user experience.

Description

Antenna system and related product

Technical Field

The application relates to the technical field of mobile terminals, in particular to an antenna system and a related product.

Background

With the great popularization and application of wireless communication devices such as smart phones, the applications that the smart phones can support are increasing, the functions are more and more powerful, the smart phones develop towards diversification and individuation, and the smart phones become indispensable electronic products in user life. The antenna belongs to an essential part of the smart phone, along with the fact that requirements of users for data sending and receiving of the smart phone are higher and higher, along with the fact that space of the smart phone is limited, the scheme of multiplexing the antenna radiator is applied to the smart phone more and more, and for the technical scheme of multiplexing the antenna radiator, isolation of the antenna is low, and user experience is poor.

Disclosure of Invention

The embodiment of the application provides an antenna system and wireless communication equipment, so that the isolation of an antenna is expected to be improved, and the user experience is improved.

In a first aspect, an embodiment of the present application provides an antenna system, where the antenna system includes: the antenna comprises an antenna radiator, a high-frequency signal source, a low-frequency signal source, a first capacitor, a second capacitor and a first tuner;

the left end of the antenna radiator is connected with one end of the first capacitor, the other end of the first capacitor is connected with the high-frequency signal source, the right end of the antenna radiator is connected with one end of the second capacitor, the other end of the second capacitor is connected with the low-frequency signal source, the middle end of the antenna radiator is connected with one end of the first tuner, and the other end of the first tuner is grounded.

In a second aspect, an electronic device is provided, the electronic device comprising the antenna system of the first aspect.

It can be seen that in the embodiment of the application, the tuner is added in the embodiment, and experiments show that the antenna system with the added tuner has a good isolation effect, so that the antenna system has the advantages of good antenna isolation and high user experience.

Drawings

In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic diagram of a wireless communication device.

Fig. 2 is a schematic diagram of an antenna system according to the present application.

Fig. 3a is a graph illustrating an antenna isolation according to the present application.

Fig. 3b is a graph illustrating another antenna isolation according to the present application.

Fig. 3c is a graph illustrating still another antenna isolation according to the present application.

Fig. 3d is a graph illustrating still another antenna isolation according to the present application.

Fig. 4a is a circuit diagram of state one of the present application.

Fig. 4b is a circuit diagram of state two of the present application.

Fig. 4c is a circuit diagram of state three of the present application.

Fig. 4d is a circuit diagram of state four of the present application.

Fig. 5a is a schematic structural diagram of a tuner according to the present application.

Fig. 5b is a schematic structural diagram of another tuner according to 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 only a part of the embodiments of the present application, 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 inventive step, are within the scope of the present disclosure.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The isolation may be: the ratio of the incident power at one port of the multiport antenna to the power available at the other port.

The wireless communication device according to the embodiment of the present application may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), Mobile Stations (MS), terminal devices (terminal device), and the like. Of course, in other applications, the wireless communication device may also be a network side device, such as a base station, an access point, and the like. For convenience of description, the above-mentioned devices are collectively referred to as wireless communication devices.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a wireless communication device 100 according to an embodiment of the present application, where the wireless communication device 100 includes an antenna system 20; the antenna system 20 includes: the antenna comprises an antenna radiator 21, a high-frequency signal source 22, a low-frequency signal source 23, a first capacitor C1 and a second capacitor C2;

the left end of the antenna radiator 21 is connected to one end of a first capacitor C1, the other end of the first capacitor C2 is connected to the high-frequency signal source 22, the right end of the antenna radiator 21 is connected to one end of a second capacitor C2, the other end of the second capacitor C2 is connected to the low-frequency signal source 23, and the middle end of the antenna radiator 21 is grounded.

Referring to fig. 1, as shown in fig. 1, an antenna radiator 21 is logically divided into 2 antennas by a middle ground, and for convenience of description, the 2 antennas are referred to as an antenna 1 and an antenna 2, the antenna 1 is connected to a high frequency signal source 22 through a C1, and the antenna 2 is connected to a low frequency signal source through a C2. As shown in the

curves

301 and 302 of fig. 3a, the isolation of the structure shown in fig. 1 is relatively poor, that is, the isolation is relatively high, and the structure shown in fig. 1 cannot tune the high frequency signal and the low frequency signal, which affects the user experience, as shown in the

curves

301 and 302 of fig. 3 a.

Referring to fig. 2, fig. 2 is a schematic diagram of an antenna system according to an embodiment of the present application, where the antenna system is shown in fig. 2 and includes: the antenna comprises an antenna radiator 21, a high-frequency signal source 22, a low-frequency signal source 23, a first capacitor C1, a second capacitor C2, a

first selection switch

34 and 4 tuners 208;

the point a at the left end of the antenna radiator 21 is connected to one end of a first capacitor C1, the other end of the first capacitor C1 is connected to one end of one side of the first selection switch 24, the point B at the right end of the antenna radiator 21 is connected to one end of a second capacitor C2, the other end of the second capacitor C2 is connected to the other end of one side of the first selection switch 34, the two ends of the other side of the first selection switch are respectively connected to the high-frequency signal source 22 and the low-frequency signal source 23, the points C, D, E and F of the antenna radiator 21 are respectively connected to one end of 4 tuners (Tuner)208, the other ends of the 4 tuners 208 are grounded, wherein the points C and D are respectively located at the left and right sides of the point a, and the points E and F are respectively located at the left and right sides of the point B.

The antenna radiator 21 may specifically be: a flexible circuit board (FPC), a laser direct structuring antenna (LDS), or a printed antenna (PDS).

The structure shown in fig. 2 is adopted, which has four states, state one (the specific circuit is shown in fig. 4 a): the left side of the antenna radiator 21 is low frequency, and the right side of the antenna radiator 21 is medium-high frequency; state two (the specific circuit is shown in fig. 4 b): the right side of the antenna radiator 21 is low frequency, and the left side of the antenna radiator 21 is medium-high frequency; state three (the specific circuit is shown in fig. 4 c): the left side of the antenna radiator 21 is high frequency, and the right side of the antenna radiator 21 is medium-high frequency; state four (the specific circuit is shown in fig. 4 d): the right side of the antenna radiator 21 is high frequency, and the left side of the antenna radiator 21 is medium high frequency.

The first selection switch may be a Double Pole Double Throw (DPDT) switch. Of course, in practical applications, the first selection switch may be another switch, such as 3P3T or a multiway small switch.

Referring to fig. 3a, fig. 3a is a schematic diagram of the isolation in the state shown in fig. 4a, and as shown in fig. 3a, a curve 303 is a schematic diagram of the isolation of the antenna system shown in fig. 2. As shown in fig. 3a, the isolation is improved by the isolation between the 3 pairs of

antennas

1 and 2 by the tuner.

Referring to fig. 3b, fig. 3b is a schematic diagram showing the isolation variation of the capacitance or inductance variation of the tuner 1 at the medium frequency and the low frequency, and each curve in fig. 3b represents a capacitance or inductance value of the tuner 1.

Referring to fig. 3c, fig. 3c is a schematic diagram showing the isolation variation of the capacitance or inductance value of the tuner 4 at the middle frequency and the low frequency, and each curve in fig. 3c represents a capacitance or inductance value of the tuner 4.

Referring to fig. 3d, fig. 3d is a schematic diagram illustrating the variation of the isolation between the capacitance or inductance of the tuner 3 at the medium frequency and the high frequency, and each curve in fig. 3d represents a capacitance or inductance of the tuner 3.

Optionally, Tuner may be: the variable capacitor, the variable inductor and the second selection switch.

Of course, in practical application, the structure of the Tuner may also be as shown in fig. 5a, where the Tuner includes: the variable capacitor, the switch, and the switch and the variable capacitor are serially connected between the antenna radiator 21 and the ground. One end of the switch k is connected to the antenna radiator 21 (left end, right end or middle end), the other end of the switch is connected to one end of the variable capacitor, and the other end of the variable capacitor is grounded. Optionally, the switch may be a switching tube, such as a mos tube, a triode, or the like.

Referring to fig. 2, the 4 tuners may be referred to as tuner 1, tuner 2, tuner 3, and tuner 4 for convenience of description, where tuner 1 is connected to E point and ground, tuner 2 is connected to D point, tuner 3 is connected to F point, and tuner 4 is connected to C point.

Of course, in practical application, the structure of the Tuner may also be as shown in fig. 5b, where the Tuner includes: the antenna comprises a variable capacitor 401, a variable inductor 402 and a selection switch 403, wherein a common end of the second selection switch is connected with the antenna radiator 21 (left end, right end or middle end), two selection ends of the second selection switch are respectively connected with one end of the variable capacitor and one end of the variable inductor, and the other end of the variable capacitor and the other end of the variable inductor are grounded.

In the configuration shown in fig. 5b, the selection switch is connected to the variable inductor if the antenna radiator is tuned for high frequency signals, and to the variable capacitor if the antenna radiator is tuned for low frequency signals.

Optionally, the antenna system may further include: and the control unit is used for controlling the turning on or off of the tuner.

Specifically, if the first selection switch selects to access the signal source (which may be either a high-frequency signal source or a low-frequency signal source) from the point a, the control unit turns off the tuner 2;

if the first option switch selects to access the signal source (which may be either the high frequency signal source or the low frequency signal source) from the point B, the control switch turns off the tuner 1.

Specifically, the control unit is further configured to control the second selection switch, specifically, if the first selection switch selects the high-frequency signal source, control the second selection switch to turn on the variable inductor, and if the first selection switch selects the low-frequency signal source, control the second selection switch to turn on the variable capacitor. Because for the capacitance, the low-frequency signal or the medium-low frequency signal is mainly pulled up or suppressed, and for the inductance, the high-frequency signal or the medium-high frequency signal is mainly pulled up or suppressed.

The present application further provides an electronic device, which includes an antenna system, as shown in fig. 2, including: the antenna comprises an antenna radiator 21, a high-frequency signal source 22, a low-frequency signal source 23, a first capacitor C1, a second capacitor C2, a

first selection switch

34 and 4 tuners 208;

the point a at the left end of the antenna radiator 21 is connected to one end of a first capacitor C1, the other end of the first capacitor C2 is connected to one end of one side of the first selection switch 24, the point B at the right end of the antenna radiator 21 is connected to one end of a second capacitor C2, the other end of the second capacitor C2 is connected to the other end of one side of the first selection switch 24, the two ends of the other side of the first selection switch are respectively connected to the high-frequency signal source 22 and the low-frequency signal source 23, the points C, D, E and F of the antenna radiator 21 are respectively connected to one end of 4 tuners (Tuner)208, the other ends of the 4 tuners 208 are grounded, wherein the points C and D are respectively located at the left and right sides of the point a, and the points E and F are respectively located at the left and right sides of the point B.

antennas

1 and 2 by the tuner.

Referring to fig. 3b, fig. 3b is a schematic diagram showing the isolation variation of the capacitance or inductance value of the tuner 1, wherein each curve represents a capacitance or inductance value of the tuner 1.

Referring to fig. 3c, fig. 3c is a schematic diagram showing the isolation variation of the capacitance or inductance value of the tuner 4, wherein each curve represents a capacitance or inductance value of the tuner 4.

Of course, in practical application, the structure of the Tuner may also be as shown in fig. 5b, where the Tuner includes: the antenna comprises a control switch 404, a variable capacitor 401, a variable inductor 402 and a second selection switch 403, wherein a common terminal of the second selection switch is connected to a first port of the control switch 404, a second port of the control switch is connected to the antenna radiator 21 (left end, right end or middle end), a control port of the control switch 404 is connected to a control signal (for example, to one control port of a control unit), two selection terminals of the second selection switch are respectively connected to one terminal (i.e., one terminal of Tuner) of the variable capacitor and the variable inductor, and the other terminals (i.e., the other terminal of Tuner) of the variable capacitor and the variable inductor are grounded.

Specifically, if the first selection switch selects to access the signal source (which may be either a high-frequency signal source or a low-frequency signal source) from the point a, the control unit turns off the control switch of the tuner 2 (i.e., inputs a low level to the control port of the control switch of the tuner 2); in this case, the tuner 1 corresponds to a ground, and the tuner 3 and the tuner 4 tune both antennas.

If the first option switch selects to access the signal source (which may be either the high frequency signal source or the low frequency signal source) from the point B, the control switch turns off the tuner 1 (i.e., the control port of the control switch of the tuner 1 is input with a low level). In this case, the tuner 2 is equivalent to the ground, and the tuner 3 and the tuner 4 tune both antennas.

The foregoing is an implementation of the embodiments of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the embodiments of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.

Claims

1. An antenna system, comprising: the antenna comprises an antenna radiator, a high-frequency signal source, a low-frequency signal source, a first capacitor, a second capacitor, a first selection switch and 4 tuners;

a point A at the left end of the antenna radiator is connected with one end of the first capacitor, the other end of the first capacitor is connected with one end of one side of the first selection switch, a point B at the right end of the antenna radiator is connected with one end of the second capacitor, the other end of the second capacitor is connected with the other end of one side of the first selection switch, two ends of the other side of the first selection switch are respectively connected with the high-frequency signal source and the low-frequency signal source, a point C, a point D, a point E and a point F of the antenna radiator are respectively connected with one ends of 4 tuners, and the other ends of the 4 tuners are grounded, wherein the point C and the point D are respectively positioned at the left side and the right side of the point A, and the point E and the point F are respectively positioned at the left side and the right side of the point;

the antenna system comprises the following four states:

in the first state, the first selection switch is communicated with a point A and the low-frequency signal source and is disconnected with a point B and the high-frequency signal source, the left side of the antenna radiator is low-frequency, and the right side of the antenna radiator is medium-high frequency;

in a second state, the first selection switch is communicated with a point B and the low-frequency signal source and is disconnected with the point A and the high-frequency signal source, the right side of the antenna radiating body is low-frequency, and the left side of the antenna radiating body is medium-high frequency;

in a third state, the first selection switch is communicated with the point A and the high-frequency signal source and is disconnected with the point B and the low-frequency signal source, the left side of the antenna radiating body is high-frequency, and the right side of the antenna radiating body is medium-high frequency;

and in the fourth state, the first selection switch is communicated with the point B and the high-frequency signal source and is disconnected with the point A and the low-frequency signal source, the right side of the antenna radiating body is high-frequency, and the left side of the antenna radiating body is medium-high frequency.

2. The antenna system of claim 1, wherein the 4 tuners comprise: the tuner comprises a first tuner, a second tuner, a third tuner and a fourth tuner, wherein the first tuner is connected with the point E and the ground, the second tuner is connected with the point D, the third tuner is connected with the point F, and the fourth tuner is connected with the point C.

3. The antenna system of claim 1 or 2, wherein the tuner is: variable capacitance or variable inductance.

4. The antenna system of claim 1 or 2, wherein the tuner comprises: a switch and a variable capacitance, the switch being in series with the variable capacitance.

5. The antenna system of claim 1 or 2, wherein the tuner comprises: the tuner comprises a control switch, a second selection switch, a variable capacitor and a variable inductor, wherein two selection ends of the second selection switch are respectively connected with one end of the variable capacitor and one end of the variable inductor, a common end of the second selection switch is connected with a second port of the control switch, a first port of the control switch is one end of the tuner, a control port of the control switch is connected with a control signal, and the other end of the variable capacitor and the other end of the variable inductor are the other end of the tuner.

6. The antenna system of claim 5, wherein the second selection switch is a single-pole double-throw switch and the control switch is a mos transistor or a triode.

7. The antenna system of claim 1 or 2, wherein the first selection switch is a double pole double throw switch, a 3D3P or a multiple small switch.

8. The antenna system according to claim 1 or 2, characterized in that the antenna radiator is: a flexible circuit board FPC, a laser direct structuring antenna LDS or a printed antenna PDS.

9. An electronic device, characterized in that the electronic device comprises an antenna system according to any of claims 1-8.

10. The electronic device of claim 9, wherein the number of antenna systems is 1, 2, 4, 6, or 8.