CN219144490U

CN219144490U - Antenna and communication device

Info

Publication number: CN219144490U
Application number: CN202320151497.1U
Authority: CN
Inventors: 黄盈
Original assignee: Dongguan Tp Link Technology Co ltd
Current assignee: Dongguan Tp Link Technology Co ltd
Priority date: 2023-02-02
Filing date: 2023-02-02
Publication date: 2023-06-06
Anticipated expiration: 2033-02-02

Abstract

The application is applicable to the technical field of communication, and provides an antenna and communication equipment, wherein the antenna comprises a circuit board and an antenna main body, the antenna main body comprises a low-frequency radiation branch, the low-frequency radiation comprises a first branch, a second branch, a third branch and at least one fourth branch, the first branch, the second branch and the third branch are sequentially and vertically connected and form an open rectangular ring, and the fourth branch and at least one of the first branch, the second branch and the third branch form at least one closed hollow ring positioned on the inner side of the open rectangular ring; a high-frequency radiation branch, a first end of which is connected to the feeding point, the high-frequency radiation branch extending toward the third branch. According to the antenna, the closed hollow ring is arranged on the low-frequency radiation branch, the bandwidth of a low-frequency band can be improved, the low-frequency radiation branch forms a rectangular semi-surrounding structure, at least one part of the high-frequency radiation branch is arranged in the semi-surrounding structure, and the antenna is small in area and volume as a whole.

Description

Antenna and communication device

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to an antenna and a communications device.

Background

With the development of mobile communication technology, LTE (Long Term Evolution ) antennas are growing, and their performance is better than that of 3G wireless networks, so that more excellent communication transmission can be achieved, and LTE is formally listed as a brand new wireless standard specification by the third generation partnership project (Third Generation Partnership Project,3 GPP).

Meanwhile, with the development of diversification of functions of electronic products, more and more electronic products select built-in communication modules, and share mobile communication technology and mobile communication networks. Due to product form and cost concerns, these end products are not only required to have smaller dimensions, but also place high demands on electrical performance, which presents a significant challenge for the design of the end antenna.

Since LTE technology has faster transmission speed and larger transmission bandwidth, the design of the antenna must also meet the bandwidth requirement correspondingly. The main problem of the LTE printed antenna is that the frequency band is narrow, especially the low frequency (the low frequency branches need longer current paths), and the transmission requirement (800 MHz-960 MHz) cannot be met. Currently, the technology increases the bandwidth by two sets of half-wave dipoles, but results in a significant increase in size. Therefore, on the basis of the space on the hardware board being generally relatively limited and the space reserved for antenna design being smaller, how to design a printed antenna with better performance in both low-frequency and high-frequency bands (1710 MHz-2690 MHz) is a great difficulty in design.

Disclosure of Invention

An objective of the embodiments of the present application is to provide an antenna and a communication device, which aim to solve the technical problem that the bandwidth of the low-frequency band of the existing LTE printed antenna is narrower.

This embodiment is so realized, an antenna, including circuit board and antenna main part, the circuit board has the earthing region and dodges the forbidden area that the earthing region set up, antenna main part locates forbidden area, antenna main part includes:

a power feeding unit having a power feeding point;

the low-frequency radiation branch comprises a first branch, a second branch, a third branch and at least one fourth branch, wherein the first branch, the second branch and the third branch are sequentially and vertically connected to form an open rectangular ring, and the first end, far away from the second branch, of the first branch is connected with the feed point; the fourth branch and at least one of the first branch, the second branch and the third branch form at least one closed hollow ring positioned on the inner side of the open rectangular ring;

a high-frequency radiation branch, a first end of which is connected to the feeding point, the high-frequency radiation branch extending toward the third branch.

In one embodiment, the closed hollow ring is formed at a kinked connection of the first and second limbs; and/or

The closed hollow ring is formed at the bending connection of the second branch and the third branch.

In one embodiment, at least a portion of the fourth stub is 90 ° bent or curved.

In one embodiment, the low frequency radiation stub further comprises a fifth stub disposed at an end of the third stub remote from the second stub and forming an open loop with the third stub.

In one embodiment, the high-frequency radiation branch includes a sixth branch and a seventh branch, one end of the sixth branch is connected to the feeding point, and the sixth branch is a sheet-shaped branch, and the seventh branch extends from a side of the sixth branch facing away from the second branch to the third branch.

In one embodiment, the high-frequency radiation branch further includes an eighth branch extending from a side of the sixth branch facing away from the second branch to the third branch or from a side of the sixth branch near the second branch to the third branch.

In one embodiment, the antenna main body further comprises a first grounding branch, the grounding area is provided with a grounding plate, and the first grounding branch is located on one side, away from the high-frequency radiation branch, of the second branch, is connected with the grounding plate and is in an inverse F shape.

In one embodiment, the antenna main body further includes a second ground stub, which is connected to the ground plate, on a side of the high-frequency radiation stub facing away from the second stub.

In one embodiment, the no-laying area is rectangular, the feeding portion is disposed on a long side of the no-laying area, the first branch and the third branch are parallel to the long side of the no-laying area, and the length of the first branch is smaller than that of the third branch.

Another object of an embodiment of the present application is to provide a communication device, which includes a housing, an antenna as described in the foregoing embodiments and disposed in the housing, and a radio frequency link disposed on the circuit board, where the radio frequency link is connected to the feeding portion.

The antenna and the communication equipment provided by the embodiment of the application have the beneficial effects that:

the application provides an antenna includes circuit board and antenna main part, in the antenna main part, the low frequency radiation minor matters are including perpendicular first minor matters, second minor matters and the third minor matters of connecting and forming open rectangle annular in proper order, the first end of keeping away from the second minor matters of first minor matters is used for being connected with the feed point, still include at least one fourth minor matters, at least one in fourth minor matters and first minor matters, second minor matters, the third minor matters forms closed empty core ring, the first end of high frequency radiation minor matters is used for being connected to the feed point, the high frequency radiation minor matters extend towards the third minor matters. The bandwidth of the low-frequency band can be improved by arranging the closed hollow ring on the low-frequency radiation branch, the low-frequency radiation branch forms a rectangular semi-surrounding structure, at least a part of the high-frequency radiation branch is arranged in the semi-surrounding structure, and the antenna main body is integrally provided with smaller area and volume. In the communication device, the bandwidth of the low-frequency band of the antenna is improved on the basis of not obviously increasing the whole area and the whole volume of the antenna main body.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic plan view of an antenna according to a first embodiment of the present application;

fig. 2 is a schematic plan view of an antenna body of the antenna shown in fig. 1;

fig. 3 is a schematic plan view of an antenna body according to a second embodiment of the present application;

fig. 4 is a schematic plan view of an antenna body according to a third embodiment of the present application;

fig. 5 is a schematic plan view of an antenna main body according to a fourth embodiment of the present application;

fig. 6 is a schematic plan view of an antenna main body according to a fifth embodiment of the present application;

fig. 7 is a schematic plan view of an antenna main body according to a sixth embodiment of the present application;

fig. 8 is a graph of a reflection coefficient test of an antenna according to the first embodiment of the present application;

FIG. 9 is a graph of test efficiency of an antenna according to a first embodiment of the present application in the 800MHz-960MHz band;

fig. 10 is a graph showing test efficiency of the antenna according to the first embodiment of the present application in the 1710MHz-2690MHz band.

The meaning of the labels in the figures is:

100. an antenna;

1. a circuit board; 11. a grounding region; 12. a forbidden pavement area;

2. an antenna main body; 21. a power feeding section;

22. low frequency radiation branches; 221. a first branch; 222. a second branch; 223. a third branch; 224. a fourth branch; 225. fifth branch;

23. high-frequency radiation branches; 231. a sixth branch; 232. seventh branch; 233. eighth branch;

24. a first ground branch; 25. and the second grounding branch knot.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper," "lower," "left," "right," and the like are used for convenience of description based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present patent. The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.

For the purpose of illustrating the technical solutions described herein, the following detailed description is provided with reference to specific drawings and examples.

First, referring to fig. 1 and 2, an antenna 100 is provided in the embodiment of the present application, which includes a circuit board 1 and an antenna main body 2 printed on the circuit board 1, wherein the circuit board 1 has a ground area 11 and a no-laying area 12 disposed to avoid the ground area 11, in other words, the ground area 11 is provided with a ground plate (not shown), and a partial area of the ground plate on the circuit board 1 is not disposed, and the partial area is the no-laying area 12. The antenna body 2 is provided in the no-load area 12.

Furthermore, it is understood that the antenna 100 further comprises a radio frequency link (not shown) provided on the circuit board 1. The radio frequency link is used to provide an excitation current to the antenna 100.

Referring specifically to fig. 2, in the first embodiment, the antenna main body 2 includes a feeding portion 21, a low-frequency radiation branch 22, and a high-frequency radiation branch 23. The feeding part 21 is electrically connected with the radio frequency link, and a feeding point is arranged on the feeding part 21 and is electrically connected with the high-frequency radiation branch 23 and the low-frequency radiation branch 22. In this way, the radio frequency link supplies an excitation current to the high frequency radiating stub 23, the low frequency radiating stub 22 via the feeding portion 21 and its feeding point to emit signals outward through the high frequency radiating stub 23 and the low frequency radiating stub 22. Of course, in turn, it is also possible that the high frequency radiating stub 23 and the low frequency radiating stub 22 receive signals in the environment and convert them into corresponding electrical signals for transmission to the radio frequency link.

As shown in fig. 2, the low frequency radiation stub 22 includes a first stub 221, a second stub 222, and a third stub 223 which are vertically connected in sequence and form an open rectangular loop shape, a first end of the first stub 221, which is far away from the second stub 222, is connected with a feeding point, and a fourth stub 224, which forms at least one closed hollow loop inside the open rectangular loop with at least one of the first stub 221, the second stub 222, and the third stub 223, respectively.

A first end of the high-frequency radiation branch 23 is connected to the feeding point, and the other end of the high-frequency radiation branch 23 extends toward the third branch 223.

Referring to fig. 2, since the first branch 221, the second branch 222 and the third branch 223 are vertically connected in sequence and form an open rectangular ring pattern, which generally defines a space, the required length of the low frequency radiation branch 22 can be ensured in a small area on the circuit board 1; the high-frequency radiation branch 23 extends from the first end of the first branch 221 to the third branch 223, which is equivalent to being at least partially located in a rectangular semi-enclosed structure defined by the low-frequency radiation branch 22, so that the antenna main body 2 can operate in a low-frequency band and a high-frequency band simultaneously, and has smaller area and volume simultaneously; furthermore, more importantly, the fourth branch 224 and at least one of the first branch 221, the second branch 222 and the third branch 223 form at least one closed hollow ring inside the open rectangular ring, and the closed hollow ring is provided with at least one current path which is different from the current path formed by the first branch 221, the second branch 222 to the third branch 223, so that the bandwidth of the low frequency band can be expanded without obviously increasing the area of the semi-surrounding structure of the open rectangular ring. On this basis, by reasonably setting the length of the fourth branch 224, the frequency band and bandwidth range to be expanded can be realized. And are not particularly limited herein.

In the antenna 100 provided in this embodiment, in the antenna main body 2, the low-frequency radiation branch 22 includes a first branch 221, a second branch 222 and a third branch 223 which are sequentially and vertically connected and form an open rectangular ring, a first end of the first branch 221 far away from the second branch 222 is used for being connected with a feeding point, and further includes a fourth branch 224, where at least one of the fourth branch 224 and the first branch 221, the second branch 222 and the third branch 223 forms at least one closed hollow ring on the inner side of the open rectangular ring. The bandwidth of the low-frequency band can be improved by arranging the closed hollow ring on the low-frequency radiation branch 22, and the rectangular semi-surrounding structure formed by the low-frequency radiation branch 22 enables the antenna main body 2 to have smaller area and volume as a whole.

Referring to fig. 1, a circuit board 1 is generally regular, such as rectangular, and a keep-out area 12 is generally regular, such as rectangular. In this embodiment, the keep-out area 12 is rectangular, and has long sides disposed along the X direction and short sides disposed along the Y direction.

In this embodiment, the first branch 221 extends along the long side direction of the no-laying area 12, the second branch 222 extends along the short side direction of the no-laying area 12, the third branch 223 extends along the long side direction of the no-laying area 12, the length of the third branch 223 is greater than that of the first branch 221, and the third branch 223 is located at the edge of the circuit board. The antenna body 2 occupies an area substantially equal to the area of a rectangle defined by the length of the second branch 222 and the length of the third branch 223.

The position of the closed hollow ring can be determined as required and based on simulation results, and overall, the good radiation performance of the antenna body 2 is ensured, and the coupling effect between the antenna body and the high-frequency radiation branch 23 is regulated, that is, the position of the fourth branch 224 needs to at least consider the coupling effect between the antenna body and the high-frequency radiation branch 23.

The number of closed hollow rings may be one or more, depending on the desired spread of frequency bands and bandwidth.

Taking the low frequency radiation branch 22 as an example, as shown in fig. 2, the fourth branch 224 is formed at the bending connection of the first branch 221 and the second branch 222, that is, a portion of the closed hollow ring is formed by a portion of the bending connection between the first branch 221 and the second branch 222. In one embodiment, the fourth stub 224 is formed at the bent connection of the second stub 222 and the third stub 223, and at this time, a portion of the closed hollow ring is formed by a portion of the bent connection between the second stub 222 and the third stub 223.

In other further embodiments, fourth stub 224 may be attached to first stub 221 alone, or to second stub 222 alone, or to third stub 223 alone.

Taking the low-frequency radiating stub 22 including a plurality of fourth stubs 224 as an example, as shown in fig. 3, in the antenna main body 2, the low-frequency radiating stub 22 includes two fourth stubs 224 respectively connected to the bent connection portions of the first stub 221 and the second stub 222 and the bent connection portions of the second stub 222 and the third stub 223.

In other embodiments, the positions of two or more fourth knuckles 224 can be arranged and combined as desired, such as at the bent connection of first knuckle 221 and second knuckle 222, and on third knuckle 223. For other combinations, the description is not repeated herein.

The shape of the closed hollow ring, i.e. the shape of the fourth stub 224, is not limited solely. In one embodiment, as shown in fig. 2, the fourth stub 224 is 90 ° bent, which forms a rectangular closed loop with the first stub 221 and the second stub 222, which are also 90 ° bent.

In another embodiment, as shown in fig. 3, the fourth stub 224 is in the form of a curve, one end of which is connected to the second stub 222 and the other end of which is connected to the third stub 223.

In other embodiments, fourth stub 224 may take other forms, such as a fold line, or a combination of fold lines and curves, or a curve in one portion and a 90 ° fold pattern in another portion.

Without being limited thereto, in other embodiments, when the low frequency radiation branch 22 includes a plurality of fourth branches 224, the shape of each fourth branch 224 may be set independently, for example, two may be 90 ° bent, or two may be curved, or other combinations of the foregoing forms may be used, which is not repeated herein.

Referring to fig. 1 to 3, in one embodiment, the low frequency radiation branch 22 further includes a fifth branch 225, and the fifth branch 225 is disposed at an end of the third branch 223 away from the second branch 222, and forms an open loop with the third branch 223. The fifth branch 225 is used to improve the low-frequency impedance matching performance of the antenna 100, and of course, the fifth branch 225 can further expand the bandwidth range of the low-frequency band by reasonably setting the length of the fifth branch 225.

The shape of the open loop formed by the ends of the fifth branch 225 and the third branch 223 may also be adjusted according to simulation, for example, may be a rectangular open loop or other forms of open loop, which is not limited herein.

Referring to fig. 1 and 2, in one embodiment, the high frequency radiating stub 23 includes a sixth stub 231 and a seventh stub 232, one end of the sixth stub 231 is connected to the feeding point, the sixth stub 231 is a sheet-shaped stub, the sixth stub 231 extends toward the third stub 223, and the seventh stub 232 extends from a side of the sixth stub 231 facing away from the second stub 222 toward the third stub 223.

The sixth branch 231 is a sheet-shaped branch, which is mainly used for limiting the range of the high-frequency band, and the seventh branch 232 is used for further expanding the bandwidth range of the high-frequency band on the basis of the bandwidth range limited by the sixth branch 231.

The sixth branch 231 extends toward the third branch 223, and the seventh branch 232 extends from a side of the sixth branch 231 facing away from the second branch 222 toward the third branch 223, such that the sixth branch 231 and the seventh branch 232 are also generally located within the semi-enclosed structure defined by the low frequency radiating branch 22, and thus the overall area occupied by the antenna 100 is small.

Since the area range of the antenna 100 is limited, the sixth branch 231 may be obliquely extended toward the third branch 223 as shown in fig. 4 and 5, so that a required length of the sixth branch 231 can be ensured, thereby ensuring the setting of the high frequency band.

Of course, without limitation thereto, in other cases, such as where the range of lengths of the second stub 222 permits, the sixth stub 231 may extend generally perpendicularly toward the third stub 223, as may be seen with reference to fig. 6.

The shape of the sixth branch 231 is also not particularly limited, and as shown in fig. 4 and 5, the sixth branch 231 is generally a quadrangle with an increasing width (width refers to a dimension parallel to the long side of the keep-out area 12), or a parallelogram; as shown in fig. 6, the sixth stub 231 is generally elliptical. In other embodiments, the sixth branch 231 may have other designs, which are not limited only herein.

Also, the number of seventh knots 232 may be set to more than one.

As shown in fig. 4 and 5, the high-frequency radiation stub 23 further includes an eighth stub 233, and the eighth stub 233 functions in the same manner as the seventh stub 232 and also serves to extend the bandwidth range of the high-frequency band (in other words, corresponds to another seventh stub 232).

The eighth branch 233 may be disposed on the same side of the sixth branch 231 as the seventh branch 232, extending from a side of the sixth branch 231 facing away from the second branch 222 toward the third branch 223, or may be disposed on opposite sides of the sixth branch 231, respectively, from a side of the sixth branch 231 adjacent to the second branch 222 toward the third branch 223, respectively, with the seventh branch 232.

The eighth branch 233 needs to be arranged in consideration of the coupling relation between the eighth branch 233 and the seventh branch 232, the sixth branch 231, and the shape and the number of the eighth branch 233 can be in various forms without being limited solely on the basis that the area of the forbidden region 12 allows and does not affect the impedance matching and the radiation performance of the antenna 100.

As shown in fig. 4 and 5, seventh branch 232 may extend from a side of sixth branch 231 facing away from second branch 222 along a long side of keep-out region 12 and then obliquely toward third branch 223 (seventh branch 232 is generally L-shaped); alternatively, as shown in fig. 6, the seventh stub 232 is in a curved form, and is adapted to the shape of the side edge of the sixth stub 231, which is in an oval shape. As shown in fig. 4, eighth branch 233 may extend from a side of sixth branch 231 facing away from second branch 222 along a long side of no-paving region 12 and then obliquely toward third branch 223; alternatively, as shown in fig. 5, the eighth branch 233 may extend from the side of the sixth branch 231 near the second branch 222 along the long side of the no-paving region 12, and then extend obliquely or vertically toward the third branch 223 (the eighth branch 233 is generally L-shaped), where the eighth branch 233 is located between the sixth branch 231 and the second branch 222, it is preferable to arrange so as not to cause a significant coupling effect with the sixth branch 231 and the second branch 222 and to reasonably use the space between the sixth branch 231 and the second branch 222.

As shown in fig. 2 to 6, the antenna main body 2 further includes a first grounding branch 24, and the first grounding branch 24 is located at a side of the second branch 222 away from the high-frequency radiation branch 23, that is, outside a semi-surrounding structure formed by the low-frequency radiation branch 22, and is connected to the grounding plate and has an inverse F shape.

The first grounding branch 24 is coupled to the low frequency radiation branch 22 and the high frequency radiation branch 23. By adjusting the position and the size of the reverse F-shaped branch, the bandwidth of the high frequency band of the antenna 100 can be widened, and the matching characteristic of the antenna 100 can be further improved.

In one embodiment, the second ground stub 25 may also be further provided on the antenna body 2 to further improve the matching characteristics of the antenna 100. As shown in fig. 7, the second grounding branch 25 is provided on the side of the high-frequency radiation branch 23 facing away from the second branch 222, with the area of the rectangular semi-surrounding structure formed by the low-frequency radiation branch 22 being allowed, and the shape thereof is set taking into consideration the coupling effect with the high-frequency radiation branch 23, without being particularly limited.

The antenna 100 provided in the embodiment of the present application has the advantages that:

the antenna 100 is designed to have a loop structure on one section of the low-frequency radiation branch 22, so that the current path can be increased, and the bandwidth of the low-frequency band of the antenna 100 can be effectively widened.

The antenna 100 is designed into a semi-rectangular ring structure by the low-frequency radiation branch 22, so that the space is fully utilized, the effective length required by the low-frequency radiation branch 22 is obtained, and the low-frequency radiation efficiency of the antenna 100 is improved.

The antenna 100 is designed into an open-loop-shaped branch shape at the tail end of the low-frequency radiation branch 22, so that the bandwidth of the low-frequency band of the antenna 100 can be widened, and the matching characteristic of the antenna 100 can be improved.

The antenna 100 is designed with the L-shaped branch on the high-frequency radiation branch 23, so that the bandwidth range of the high-frequency band of the antenna 100 can be effectively widened.

The antenna 100 is designed with the reverse F-shaped branch connected with the ground plate outside the low-frequency radiation branch 22, and the bandwidth range of the high-frequency band of the antenna 100 can be widened by adjusting the position and the size of the reverse F-shaped branch, so that the matching characteristic of the antenna 100 is improved.

The antenna 100 adopts a multi-branch structure, and the length of each branch can be independently adjusted to optimize the mutual coupling effect therebetween so as to obtain a required working frequency band and better standing wave characteristics.

As shown in FIG. 8, the reflection coefficient of the antenna 100 is less than-6 dB at 800-960MHz and less than-9.6 dB at 1710-2690 MHz. The antenna 100 has an average radiation efficiency of greater than 64% in the 800MHz-960MHz band as shown in fig. 9, and an average radiation efficiency of greater than 72% in the 1710MHz-2690MHz band as shown in fig. 10. In general, the antenna 100 obtains a better matching characteristic and a higher radiation efficiency in both the low frequency 800MHz-960MHz and the high frequency 1710MHz-2690MHz bands in the case where the space occupied by the antenna main body 2 is 64mm×23 mm.

Embodiments of the present application also provide a communication device, which includes a housing and an antenna 100 provided in the housing and described in the foregoing embodiments. The communication device may be a mobile phone or other types of terminals.

Based on the foregoing beneficial effects of the antenna 100, the communication device also has corresponding beneficial effects, which are not described in detail.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

Claims

1. An antenna, its characterized in that includes circuit board and antenna main part, the circuit board has the earthing region and dodges the forbidden area that the earthing region set up, antenna main part locates forbidden area, antenna main part includes:

a power feeding unit having a power feeding point;

2. The antenna of claim 1, wherein the closed hollow loop is formed at a kink connection of the first stub and the second stub; and/or

3. The antenna of claim 1, wherein at least a portion of the fourth stub is 90 ° bent or curved.

4. The antenna of claim 1, wherein the low frequency radiating stub further comprises a fifth stub disposed at an end of the third stub remote from the second stub and forming an open loop with the third stub.

5. The antenna according to claim 1, wherein the high-frequency radiation stub includes a sixth stub and a seventh stub, one end of the sixth stub is connected to the feeding point, and the sixth stub is a sheet-like stub, the seventh stub extends from a side of the sixth stub facing away from the second stub toward the third stub.

6. The antenna according to claim 5, wherein the high-frequency radiation stub further includes an eighth stub extending from a side of the sixth stub facing away from the second stub toward the third stub or from a side of the sixth stub near the second stub toward the third stub.

7. The antenna according to any one of claims 1 to 6, wherein the antenna main body further includes a first ground stub provided with a ground plate, the first ground stub being located on a side of the second stub facing away from the high-frequency radiation stub, connected to the ground plate, and having an inverted-F shape.

8. The antenna according to claim 7, wherein the antenna main body further includes a second ground stub, the second ground stub being connected to the ground plate on a side of the high-frequency radiation stub facing away from the second stub.

9. The antenna of any one of claims 1 to 6, wherein the keep-out area is rectangular, the feed is provided on a long side of the keep-out area, the first branch and the third branch are both parallel to the long side of the keep-out area, and a length of the first branch is smaller than a length of the third branch.

10. A communication device comprising a housing and an antenna according to any of the preceding claims 1 to 9 provided in the housing, the antenna further comprising a radio frequency link provided on the circuit board, the radio frequency link being connected to the feed.