CN115663462A - Antenna structure and electronic equipment - Google Patents

Abstract

The application discloses antenna structure and electronic equipment belongs to antenna technical field. The antenna structure includes: the antenna comprises a first antenna arm and a second antenna arm, wherein a first gap is formed between a first end of the first antenna arm and a first end of the second antenna arm; a first matching circuit connected to a first connection point of the first antenna arm; a feeding point provided on the first antenna arm; a second matching circuit connected to the second antenna arm; the absolute value of the difference between the length of the first antenna arm and the quarter wavelength of the low frequency band is less than or equal to a first preset value; a first length is formed between the first connecting point and the first end of the first antenna arm, a first difference value is formed between the first length and one third of the length of the first antenna arm, and the absolute value of the first difference value is smaller than or equal to a second preset value; and/or there is a second difference between the first length and one half of the length of the first antenna arm, the absolute value of the second difference being less than or equal to a third preset value.

Description

Antenna structure and electronic equipment

Technical Field

The application belongs to the technical field of antennas, and particularly relates to an antenna structure and electronic equipment.

Background

With the increasing complexity of mobile terminal antennas, performance requirements are also increasing, which not only requires good antenna performance of the terminal device in a free state, but also requires high antenna performance in a human-head state, and also considers requirements of multiple frequency bands. In the face of such challenges, conventional technologies often do not have a perfect scheme, and some compromises are made, such as separation of low-band and medium-high band (i.e., medium-band and/or high-band) antennas, the low-band is generated by using side and bottom L-shaped antenna arms, and the medium-high band antenna is sacrificed to some extent and placed in another corner of the bottom, at this time, the performance of the medium-high band antenna is greatly reduced, and the antenna efficiency is generally about-10.5 dB.

In the other scheme, the low-frequency, medium-frequency and high-frequency antennas are arranged on one antenna, and medium-frequency and high-frequency parasitic antennas are arranged at the left end and the right end of the antenna.

Disclosure of Invention

The embodiment of the application provides an antenna structure and electronic equipment, and can solve the problem that the existing antenna scheme cannot give consideration to the antenna performance of a low frequency band and a medium-high frequency band in design.

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 an antenna structure, including:

the antenna comprises a first antenna arm and a second antenna arm, wherein a first gap is formed between a first end of the first antenna arm and a first end of the second antenna arm, a second end of the first antenna arm and a second end of the second antenna arm are respectively grounded, the working frequency band of the first antenna arm is a low frequency band, and the working frequency band of the second antenna arm is a medium frequency band and/or a high frequency band;

a first matching circuit connected to a first connection point of the first antenna arm;

a feeding point provided at the first antenna arm;

a second matching circuit connected with the second antenna arm;

wherein an absolute value of a difference between a length of the first antenna arm and a quarter wavelength of the low frequency band is less than or equal to a first preset value;

the first connection point has a first length to the first end of the first antenna arm, the first length satisfying at least one of:

a first difference value is formed between the first length and one third of the length of the first antenna arm, and the absolute value of the first difference value is smaller than or equal to a second preset value;

a second difference value is formed between the first length and one half of the length of the first antenna arm, and the absolute value of the second difference value is smaller than or equal to a third preset value;

the first end of the first antenna arm is an end of the first antenna arm near the first slot.

In a second aspect, an embodiment of the present application further provides an electronic device, which includes the antenna structure described above.

In the embodiment of the application, a first antenna arm which is grounded and has a gap and a second antenna arm whose working frequency band is a low frequency band and/or a high frequency band, a first matching circuit connected to a first connection point of the first antenna arm, a second matching circuit connected to the second antenna arm, and a feeding point arranged on the first antenna arm are arranged, and it is ensured that an absolute value of a difference between the length of the first antenna arm and a quarter wavelength of the low frequency band is less than or equal to a first preset value, and a first length from the first connection point to a first end of the first antenna arm satisfies that the first length and a third of the length of the first antenna arm have a first difference, and/or the first length and a half of the length of the first antenna arm have a second difference, so that the first antenna arm has a stronger current in the low frequency band.

Drawings

Fig. 1 is one of schematic structural diagrams of an antenna structure according to an embodiment of the present application;

fig. 2 is a second schematic structural diagram of an antenna structure according to an embodiment of the present application;

fig. 3 is a third schematic structural diagram of an antenna structure according to an embodiment of the present application;

fig. 4 is a fourth schematic structural diagram of an antenna structure according to an embodiment of the present application;

fig. 5 is one of the schematic diagrams of the current distribution around the first antenna arm, the first leg in the first application case;

fig. 6 is a second schematic view of the current distribution around the first antenna arm and the first leg in the first application;

fig. 7 is a third schematic view of the current distribution around the first antenna arm and the first leg in the first application case;

FIG. 8 is a diagram illustrating the S11 and efficiency curves of each frequency band after actual matching optimization;

fig. 9 is a schematic structural diagram of an antenna structure in application case two;

fig. 10 is a schematic structural diagram of an antenna structure of application case three;

fig. 11 is a schematic diagram of a first matching circuit in application case three.

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 claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

The antenna structure and the electronic device provided in 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, an embodiment of the present application provides an antenna structure, including:

a first slot 310 exists between a first end of the first antenna arm 100 and a first end of the second antenna arm 200, a second end of the first antenna arm 100 and a second end of the second antenna arm 200 are respectively grounded, an operating frequency band of the first antenna arm 100 is a low frequency band, and an operating frequency band of the second antenna arm 200 is a medium frequency band and/or a high frequency band;

a first matching circuit 410 connected to the first connection point 110 of the first antenna arm 100;

a feeding point 500 provided in the first antenna arm 100;

a second matching circuit 430, the second matching circuit 430 being connected to the second antenna arm 200;

wherein an absolute value of a difference between the length of the first antenna arm 100 and the quarter wavelength of the low frequency band is less than or equal to a first preset value;

the first connection point 110 has a first length to the first end of the first antenna arm 100, and the first length satisfies at least one of the following:

a first difference value exists between the first length and one third of the length of the first antenna arm 100, and the absolute value of the first difference value is smaller than or equal to a second preset value;

a second difference exists between the first length and one half of the length of the first antenna arm 100, and the absolute value of the second difference is smaller than or equal to a third preset value;

the first end of the first antenna arm 100 is the end of the first antenna arm 100 close to the first slot 310.

Preferably, the first preset value is greater than or equal to 0 and less than or equal to one eighth wavelength of the low frequency band; the second preset value is greater than or equal to 0 and less than or equal to one sixth of the length of the first antenna arm 100; the third preset value is greater than or equal to 0 and less than or equal to one quarter of the length of the first antenna arm 100.

As can be seen from the above, the first matching circuit 410 may be connected to the first antenna arm 100 at only one connection point, for example, a first difference between the length of one connection point of the first matching circuit 410 to the first end of the first antenna arm 100 and one third of the length of the first antenna arm 100, or a second difference between the length of one connection point of the first matching circuit 410 to the first end of the first antenna arm 100 and one half of the length of the first antenna arm 100. The first matching circuit 410 may also be connected to the first antenna arm 100 via two connection points, for example, a first connection point of the first matching circuit 410 has a first difference between a length of the first connection point of the first matching circuit 410 to the first end of the first antenna arm 100 and one third of the length of the first antenna arm 100, and a second connection point of the first matching circuit 410 has a second difference between a length of the first connection point of the first matching circuit 410 to the first end of the first antenna arm 100 and one half of the length of the first antenna arm 100.

It should be noted here that the low frequency band in the embodiment of the present application may be a frequency band of B28, B5, and B8, and a frequency of 0.7 to 0.96 GHz; the middle frequency band and the high frequency band may be B3, B1, B40, B41, and frequency band of 1.71-2.69GHz, and it should be further noted that the low frequency band, the middle frequency band, and the high frequency band used in different communication areas are usually different.

It should be noted that the first matching circuit 410 mentioned in the embodiment of the present application is a circuit composed of a selection switch and a capacitor, and when the circuit is applied, the conduction path of the switch can be reasonably adjusted based on the working frequency band, so as to achieve the purpose of impedance matching.

Through the arrangement mode, the first antenna arm 100 can have strong current in a low frequency band, and compared with a common scheme, the head-hand derating is small.

It should be further noted that, the absolute value of the difference X mentioned in the present application is less than or equal to the preset value Y, and it can also be understood that the two parties performing the difference operation are equal or relatively close; taking the absolute value of the difference between the length of the first antenna arm 100 and the quarter wavelength of the low frequency band as an example, which is smaller than or equal to the first preset value, it can be understood that the length of the first antenna arm 100 is equal to or close to the quarter wavelength of the low frequency band, which is close to the quarter wavelength of the first antenna arm 100, which can be understood that the length of the first antenna arm 100 is slightly smaller than the quarter wavelength of the low frequency band, or the length of the first antenna arm 100 is slightly larger than the quarter wavelength of the low frequency band; other similar descriptions express the same meaning as above, and are not described in this application.

Optionally, in another embodiment of the present application, as shown in fig. 2, the antenna structure further includes:

a third matching circuit 420 connected to a second connection point 120 of the first antenna arm 100, the second connection point 120 not overlapping the first connection point 110;

wherein the second connection point 120 has a second length to the first end of the first antenna arm 100, the second length satisfying one of:

a third difference value exists between the second length and one third of the length of the first antenna arm 100, and the absolute value of the third difference value is smaller than or equal to a fourth preset value;

a fourth difference value exists between the second length and one-half of the length of the first antenna arm 100, and the absolute value of the fourth difference value is smaller than or equal to a fifth preset value.

It should be noted that, preferably, the fourth preset value in the embodiment of the present application is greater than or equal to 0 and less than or equal to one sixth of the length of the first antenna arm 100; the fifth preset value is greater than or equal to 0 and less than or equal to one quarter of the length of the first antenna arm 100.

It should be noted that, in this case, the first matching circuit 410 and the third matching circuit 420 are connected to the first antenna arm 100 at the same time, and an optional setting manner is: a first length between the first connection point 110 to which the first matching circuit 410 is connected to the first end of the first antenna arm is equal to one third of the length of the first antenna arm 100, and a second length between the second connection point 120 to which the third matching circuit 420 is connected to the first end of the first antenna arm is equal to one half of the length of the first antenna arm 100; another optional setting mode is as follows: a first length between the first connection point 110 to which the first matching circuit 410 is connected to the first end of the first antenna arm is equal to one half of the length of the first antenna arm 100 and a second length between the second connection point 120 to which the third matching circuit 420 is connected to the first end of the first antenna arm is equal to one third of the length of the first antenna arm 100.

Optionally, the third matching circuit 420 provided in this embodiment of the present application is a circuit composed of a selection switch and a capacitor, and when the third matching circuit is applied, a conduction path of the switch may be reasonably adjusted based on a working frequency band, so as to achieve an impedance matching purpose.

It should be noted that the tuning range of the low frequency band can be further increased by adding the third matching circuit 420.

Optionally, in another embodiment of the present application, the second matching circuit 430 is connected to a third connection point 201 disposed on the second antenna arm 200, and a third length is provided between the third connection point 201 and the first end of the second antenna arm, where the third length is less than or equal to a quarter wavelength of the high frequency band.

For example, the length of the third connection point 201 to the first end of the second antenna arm is equal to a quarter wavelength of the high band.

Alternatively, one of the second matching circuits 430 mentioned in the embodiments of the present application is configured to: when the circuit consisting of the selection switch and the capacitor is applied, the conducting path of the switch can be reasonably adjusted based on the working frequency band, so that the aim of impedance matching is fulfilled. Another configuration of the second matching circuit 430 is: the circuit composed of the capacitor and/or the inductor performs impedance matching through the matching of the capacitor and/or the inductor.

It should be noted that, the above description is made by taking the second antenna arm 200 as an example, of course, the second antenna arm 200 may be further subdivided into two unconnected antenna arms, and optionally, in another embodiment of the present application, a specific implementation manner of the second antenna arm 200 is shown in fig. 4, and includes:

a first arm 210 and a second arm 220;

a second gap 320 exists between the second end of the first arm 210 and the first end of the second arm 220, and the first gap 310 is disposed between the first end of the first arm 210 and the first end of the first antenna arm 100;

the length of the first arm 210 is less than a quarter wavelength of the low frequency band;

a fifth difference exists between the length of the second arm 220 and the quarter wavelength of the high frequency band, and an absolute value of the fifth difference is smaller than or equal to a sixth preset value.

Preferably, the sixth preset value in the embodiment of the present application is greater than or equal to 0 and less than or equal to one eighth wavelength of the high frequency band.

Optionally, the first arm 210 and the second arm 220 are grounded.

For example, the length of the first arm 210 is slightly less than a quarter wavelength of the low band, and the length of the second arm 220 is equal to a quarter wavelength of the high band.

Further, the second antenna arm 200 includes: the fourth connection point 202 of the first arm 210 is connected to a second matching circuit 430, a third length is provided between the fourth connection point 202 and the first end of the first arm 210, a sixth difference is provided between the third length and one third of the length of the first arm 210, and an absolute value of the sixth difference is smaller than or equal to a seventh preset value.

Preferably, the seventh preset value in the embodiment of the present application is greater than or equal to 0 and less than or equal to one sixth of the length of the first support arm 210.

For example, the length between the connection position of the second matching circuit 430 and the first end of the first arm 210 is equal to one third of the length of the first arm 210.

Optionally, in an embodiment of the present application, the feeding point 500 has a fourth length from the first end of the first antenna arm 100, and the fourth length is less than a quarter wavelength of the middle band.

For example, the length of the feeding point 500 from the first end of the first antenna arm 100 at the connection position of the first antenna arm 100 is slightly less than a quarter wavelength of the middle band.

Preferred implementations of the present application are described in detail below.

Application conditions one,

As shown in fig. 4, in this case, the antenna structure includes:

a first antenna arm 100, a first arm 210 and a second arm 220, which are respectively grounded, wherein a first gap 310 exists between the first antenna arm 100 and the first arm 210, a second gap 320 exists between the first arm 210 and the second arm 220, the length of the first antenna arm 100 is close to a quarter wavelength of a low frequency band, the length of the first arm 210 is less than the quarter wavelength of the low frequency band, and the length of the second arm 220 is close to the quarter wavelength of the high frequency band;

a first matching circuit 410 connected to a first connection point 110 of the first antenna arm 100, the first connection point 110 having a first length to a first end of the first antenna arm 100, the first length being approximately one-half of the length of the first antenna arm 100;

a third matching circuit 420 connected to a second connection point 120 of said first antenna arm 100, said second connection point 120 having a second length to the first end of said first antenna arm 100, said second length being approximately one third of the length of said first antenna arm 100;

a feeding point 500 disposed on the first antenna arm 100, wherein a fourth length from the feeding point 500 to the first end of the first antenna arm 100 is smaller than a quarter wavelength of the middle band;

a second matching circuit 430 disposed at the fourth connection point 202 of the first arm 210, wherein the second matching circuit 430 is a circuit composed of a selection switch and a capacitor, the second matching circuit 430 can be disposed at any position of the first arm 210, and preferably, the length of the second matching circuit 430 from the first end of the first arm 210 is approximately one third of the length of the first arm 210.

Specifically, the matching of the second matching circuit 430 is adjusted so that the first arm 210 just resonates at each frequency band as a parasitic antenna. For example, in the low frequency band, the switch matching corresponds to about 3-15nH, the middle frequency band corresponds to the inductor with small inductance value, and in the high frequency band, the switch matching corresponds to the extremely small inductor and even the capacitor.

Specifically, the length of the first arm 210 is originally not suitable for resonant parasitic low frequency, but through the series inductance ground, the parasitic low frequency can be realized, the low frequency radiation is assisted, and the head and hand performance is further improved.

As shown in fig. 5, the first antenna arm 100 and the first arm 210 both have stronger current in the B28 band, which is more dispersive and has less head-hand derating compared with the conventional scheme. The antenna modes are a 1/4 wavelength resonance of the low frequency band of the first antenna arm 100 and a 1/4 wavelength resonance of the low frequency band of the first arm 210.

As shown in fig. 6, the current near the end of the first antenna arm 100 and the current in the first arm 210 are stronger in the B3 band, which is more distributed than the conventional scheme, and is more concentrated in the palm, which is not easy to hold by hand, and the derating of the head and hand is small. The antenna modes are the 1/4 wavelength resonance of the first matching circuit 410 to the end of the first antenna arm 100 (i.e. the first end of the first antenna arm 100) and the 1/4 wavelength resonance of the first arm 210.

As shown in fig. 7, the current near the end of the first antenna arm 100 and the current in the B41 band of the first arm 210 are stronger, and are more distributed and more concentrated on the palm of the hand, and the hand is not easy to hold, and the head and hand derating is small. The antenna modes are the 3/4 wavelength resonance of the first antenna arm 100, the 1/2 wavelength resonance of the first arm 210, and the 1/4 wavelength resonance of the left end of the second arm 220 (i.e., the end of the second arm 220 near the second slot 320) to the second matching circuit 430.

By adjusting the matching of the first matching circuit 410, the third matching circuit 420 and the second matching circuit 430, the initial impedance curves of all frequency bands are concentrated near the first quadrant of the smith chart as much as possible, and the feed connection series capacitor is conveniently matched to the center of the smith chart. The matching tuning is flexible, if the length of the first arm 210 is lengthened a little, the matching inductance of the second matching circuit 430 can be adjusted to be a little, and if the length of the first arm 210 is shorter than the medium-high frequency 1/4 wavelength, the matching of the second matching circuit 430 can be adjusted to be a loading capacitance.

The application situation enables the current electric field distribution of the multiple frequency bands to be balanced and far away from the hand holding through ingenious combination and multiplexing thinking, and simultaneously meets the requirements of the multiple frequency bands and the requirements of small head and hand derating.

Fig. 8 is S11 and efficiency curves of each frequency band after actual matching optimization, and it can be seen that the requirements of each frequency band can be met in this case.

Table 1 is a comparison table of antenna performance between the implementation scheme of the present application and existing multiple conventional schemes in free, left-head, and right-head states, and the advantages of the implementation scheme of the present application can be clearly seen through the comparison table, where the unit of the numerical value in table 1 is dB.

Table 1 table for comparing antenna performance of the implementation scheme of the first application case of the present application with existing multiple conventional schemes in free, left-head, and right-head states

Application cases II,

As shown in fig. 9, in this case, the antenna structure includes:

a first antenna arm 100 and a second antenna arm 200 respectively grounded, wherein a first slot 310 exists between the first antenna arm 100 and the second antenna arm 200, and the length of the first antenna arm 100 is close to a quarter wavelength of a low frequency band;

a first matching circuit 410 connected to the first connection point 110 and the second connection point 120 of the first antenna arm 100, respectively, the length from the first connection point 110 to the first end of the first antenna arm 100 being equal to one half of the length of the first antenna arm 100, and the length from the second connection point 120 to the first end of the first antenna arm 100 being equal to one third of the length of the first antenna arm 100, that is, the first matching circuit 410 is connected to both connection points of the first antenna arm 100 at the same time;

a feeding point 500 disposed on the first antenna arm 100, wherein a length of the feeding point 500 from the first end of the first antenna arm 100 is less than a quarter wavelength of a middle band;

the second matching circuit 430 is disposed at a third connection point 201 of the second antenna arm 200, and a length of the third connection point 201 from the first end of the second antenna arm is equal to a quarter wavelength of a high frequency band.

In this case, compared to the application, the arrangement of one slot is reduced, only one matching circuit with a switch is arranged on the first antenna arm 100, and only one matching circuit with a switch is reserved on the first antenna arm 100, so that the cost can be saved.

Because a gap is reduced, the length of the second antenna arm 200 is increased, and the distance between the connection position of the second matching circuit 430 and the open end is as small as possible less than 1/4 wavelength of the high frequency, so that the parasitic resonance frequency of the second matching circuit 430 can be within the high frequency range in the switching state under a small inductance.

Practical application situations three,

As shown in fig. 10, in this case, the antenna structure includes:

a first antenna arm 100 and a second antenna arm 200 which are grounded respectively, wherein a first gap 310 exists between the first antenna arm 100 and the second antenna arm 200, the length of the first antenna arm 100 is close to a quarter wavelength of a low frequency band, and the length of the second antenna arm 200 is greater than or equal to 1/4 wavelength of a middle and high frequency band;

a first matching circuit 410 connected to a first connection point 110 of the first antenna arm 100, the length of the first connection point 110 to a first end of the first antenna arm 100 being equal to one third of the length of the first antenna arm 100;

a feeding point 500 provided to the first antenna arm 100; one path of the first matching circuit 410 is connected to the matching and feeding point 500;

a second matching circuit 430 disposed at the third connection point 201 of the second antenna arm 200, wherein the second matching circuit 430 is a circuit composed of a capacitor and/or an inductor, the second matching circuit 430 may be disposed at any position of the first arm 210, and preferably, the length of the second matching circuit 430 from the first end of the first arm 210 is approximately one third of the length of the first arm 210.

It should be noted that, in this case, the second antenna arm 200 is connected to the main ground at a suitable position, so that the length of the second antenna arm 200 is still greater than 1/4 wavelength of the middle-high frequency band. The performance in the mid and high frequency bands is not much affected and the performance in the low frequency bands is slightly affected, because the parasitic resonance frequency of the second antenna arm 200 is much larger than in the low frequency bands. Fig. 11 is a schematic diagram showing the circuit structure of the first matching circuit 410, which is connected to the vicinity of 1/3 of the first antenna arm 100, and one path and matching of the first matching circuit 410 are connected to the feeding point 500.

Specifically, the specific structure of the first matching circuit 410 includes:

a switch 4101, one end of the switch 4101 being grounded, the switch 4101 having a first contact point, a second contact point, a third contact point and a fourth contact point;

a first capacitance 4102, a second capacitance 4103, and a third capacitance 4104;

a first terminal of the first capacitor 4102 is connected to a first contact point of the switch 4101, a first terminal of the second capacitor 4103 is connected to a second contact point of the switch 4101, and a first terminal of the third capacitor 4104 is connected to a third contact point of the switch 4101; a second terminal of the first capacitor 4102, a second terminal of the second capacitor 4103 and a fourth contact point of the switch (4101) are all connected to the first connection point 110;

a second end of the third capacitor 4104 is connected to the feeding point 500.

For example, the capacitance value of the first capacitor is 1.5PF, the capacitance value of the second capacitor is 1.2PF, and the capacitance value of the third capacitor is 2.2PF, so that the capacitors with appropriate values can be accessed for impedance matching based on the use requirements.

Table 2 is a comparison table of antenna performance between the implementation scheme of the present application and the conventional multiple schemes in free, left-head, and right-head states, and it can be seen that some frequency bands are slightly worse than the actual application case three, but still have advantages over the conventional schemes, and one less switch is easier to implement and more cost-effective.

Table 2 table comparing antenna performance of the third implementation scheme of the application case and the existing multiple conventional schemes in the free, left-head, and right-head states

Compared with a conventional scheme, the antenna has the advantages that the first antenna arm is made of the L-shaped side edge and the L-shaped bottom edge, the main radiating arm with a low frequency band (such as B28, B5 and B8 and the frequency of 0.7-0.96 GHz) is made of the antenna arm, the opening of the antenna arm is downward, and meanwhile, the bottom antenna arm also assists in participating in low-frequency radiation, so that the performance of the left and right low-frequency head and hands is slightly reduced compared with that of a free state. And the middle and high frequency band (such as B3, B1, B40 and B41, frequency 1.71-2.69 GHz) multiplexes the bottom antenna arm to be used as a parasitic element, so that the first-hand performance of the middle and high frequency band can be good.

At least one embodiment of the present application further provides an electronic device, which includes a housing and the above-mentioned antenna structure;

the first antenna arm and the second antenna arm are arranged on a first side and a second side of the shell, and the first side and the second side are two adjacent sides on the shell.

It should be noted that, usually, the first antenna arm is L-shaped and is distributed on two adjacent sides of the electronic device, and the second antenna arm is a straight-line-shaped and is distributed on one side of the electronic device.

Optionally, the electronic device further comprises: and the screen scroll is arranged on the third side of the shell, and the third side and the first side are two opposite sides on the shell.

It should be noted that, the embodiment of the present application is applicable to any model with a scroll and having a metal middle frame, and by disposing the antenna structure on a side away from the scroll of the screen, the antenna structure does not occupy the space of the right sliding part of the scroll electronic device and does not interfere with the scroll.

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 (10)

1. An antenna structure, comprising:

a first antenna arm (100) and a second antenna arm (200), wherein a first gap (310) exists between a first end of the first antenna arm (100) and a first end of the second antenna arm (200), a second end of the first antenna arm (100) and a second end of the second antenna arm (200) are respectively grounded, an operating frequency band of the first antenna arm (100) is a low frequency band, and an operating frequency band of the second antenna arm (200) is a medium frequency band and/or a high frequency band;

a first matching circuit (410) connected to a first connection point (110) of the first antenna arm (100);

a feeding point (500) provided to the first antenna arm (100);

a second matching circuit (430), the second matching circuit (430) being connected with the second antenna arm (200);

wherein the absolute value of the difference between the length of the first antenna arm (100) and the quarter wavelength of the low frequency band is less than or equal to a first preset value;

the first connection point (110) has a first length to the first end of the first antenna arm (100), the first length satisfying at least one of:

-the first length has a first difference with one third of the length of the first antenna arm (100), the absolute value of the first difference being smaller than or equal to a second preset value;

there is a second difference between the first length and one half of the length of the first antenna arm (100), the absolute value of the second difference being less than or equal to a third preset value.

2. The antenna structure according to claim 1, further comprising:

-a third matching circuit (420) connected to a second connection point (120) of the first antenna arm (100), the second connection point (120) not overlapping the first connection point (110);

wherein the second connection point (120) has a second length to the first end of the first antenna arm (100), the second length satisfying one of:

-a third difference between the second length and one third of the length of the first antenna arm (100), the absolute value of the third difference being less than or equal to a fourth preset value;

a fourth difference is present between the second length and one half of the length of the first antenna arm (100), the absolute value of the fourth difference being smaller than or equal to a fifth preset value.

3. The antenna structure according to claim 1, characterized in that the second matching circuit (430) is connected to a third connection point (201) provided at the second antenna arm (200), the third connection point (201) having a third length to the first end of the second antenna arm (200), the third length being smaller than or equal to a quarter wavelength of the high band.

4. The antenna structure according to claim 1, characterized in that the second antenna arm (200) comprises:

a first arm (210) and a second arm (220);

a second gap (320) exists between the second end of the first arm (210) and the first end of the second arm (220), and the first gap (310) is arranged between the first end of the first arm (210) and the first end of the first antenna arm (100);

the length of the first arm (210) is less than a quarter wavelength of the low band;

and a fifth difference value is formed between the length of the second support arm (220) and the quarter wavelength of the high frequency band, and the absolute value of the fifth difference value is smaller than or equal to a sixth preset value.

5. The antenna structure according to claim 4, characterized in that a second matching circuit (430) is connected to a fourth connection point of the first arm (210), the fourth connection point (202) having a third length from the first end of the first arm (210), the third length having a sixth difference from one third of the length of the first arm (210), the absolute value of the sixth difference being smaller than or equal to a seventh preset value.

6. The antenna structure according to claim 4, characterized in that the first leg (210) is grounded.

7. An antenna arrangement according to claim 1, characterized in that the feeding point (500) has a fourth length from the first end of the first antenna arm (100) which is smaller than a quarter wavelength of the intermediate band.

8. The antenna structure according to claim 1, characterized in that the first matching circuit (410) comprises:

a switch (4101), one end of the switch (4101) being grounded, the switch (4101) having a first contact point, a second contact point, a third contact point and a fourth contact point;

a first capacitance (4102), a second capacitance (4103) and a third capacitance (4104);

wherein a first terminal of the first capacitor (4102) is connected to a first contact of the switch (4101), a first terminal of the second capacitor (4103) is connected to a second contact of the switch (4101), and a first terminal of the third capacitor (4104) is connected to a third contact of the switch (4101); a second end of the first capacitor (4102), a second end of the second capacitor (4103) and a fourth contact point of the switch (4101) are all connected with the first connection point (110);

a second end of the third capacitor (4104) is connected to the feeding point (500).

9. An electronic device, comprising: a housing and an antenna structure as claimed in any one of claims 1 to 8;

the first antenna arm and the second antenna arm are arranged on a first side and a second side of the shell, and the first side and the second side are two adjacent sides on the shell.

10. The electronic device of claim 9, further comprising: and the screen scroll is arranged on the third side of the shell, and the third side and the first side are two opposite sides on the shell.

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