CN113571869B

CN113571869B - Antenna structure

Info

Publication number: CN113571869B
Application number: CN202010349300.6A
Authority: CN
Inventors: 李昀灿; 张家豪
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2024-06-18
Anticipated expiration: 2040-04-28
Also published as: CN113571869A

Abstract

An antenna structure. The antenna structure includes: a grounding metal portion, a first metal portion, and a second metal portion; the grounding metal part is provided with a slotted hole; a feed-in point is positioned on the first metal part; the first metal part and the second metal part are both coupled to the grounding metal part and extend towards the inner part of the slot hole; the slot hole comprises a first branch part, a second branch part, a third branch part and a fourth branch part; the first metal part is between the second branch part and the third branch part of the slot, and the second metal part is between the third branch part and the fourth branch part of the slot. The invention has the advantages of small size, wide frequency band, single-layer planarization design and the like, so that the invention is very suitable for being applied to various mobile communication devices.

Description

Antenna structure

Technical Field

The present invention relates to an antenna structure (Antenna Structure), and more particularly to a Wideband (Wideband) antenna structure.

Background

With the development of mobile communication technology, mobile devices are becoming increasingly popular in recent years, and common examples are: portable computers, mobile phones, multimedia players, and other portable electronic devices with hybrid functions. To meet the needs of people, mobile devices often have wireless communication capabilities. Some cover long range wireless communication ranges, such as: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz for communication, and some cover short range wireless communication ranges, such as: wi-Fi, bluetooth systems use the frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz for communication.

Antennas are an indispensable element in the field of wireless communication. If the Bandwidth (Bandwidth) of the antenna for receiving or transmitting signals is insufficient, the communication quality of the mobile device is easily degraded. Therefore, how to design a small-sized, wide-band antenna element is an important issue for antenna designers.

Accordingly, there is a need to provide an antenna structure to solve the above-mentioned problems.

Disclosure of Invention

In a preferred embodiment, the present invention provides an antenna structure, comprising: a grounding metal part having a slot; a first metal part, wherein a feed-in point is positioned on the first metal part; and a second metal portion, wherein the first metal portion and the second metal portion are coupled to the grounding metal portion and extend toward the inside of the slot; wherein the slot comprises a first branch portion, a second branch portion, a third branch portion, and a fourth branch portion; wherein the first metal portion is interposed between the second branch portion and the third branch portion, and the second metal portion is interposed between the third branch portion and the fourth branch portion.

In some embodiments, the antenna structure further comprises: the non-conductor support element, wherein the grounding metal part, the first metal part and the second metal part are all arranged on the non-conductor support element.

In some embodiments, the non-conductive support element is a plastic element, a printed circuit board, or a flexible circuit board.

In some embodiments, the first branch portion and the second branch portion of the slot are located at one side of the feed point, and the third branch portion and the fourth branch portion of the slot are located at the opposite side of the feed point.

In some embodiments, the first leg portion of the slot has a first closed end, the second leg portion of the slot has a second closed end, the third leg portion of the slot has a third closed end, and the fourth leg portion of the slot has a fourth closed end.

In some embodiments, the antenna structure covers a first frequency band between 2400MHz and 2500MHz, a second frequency band between 5000MHz and 6000MHz, and a third frequency band between 6000MHz and 7125 MHz.

In some embodiments, the slot further comprises a first connecting portion, a second connecting portion, a third connecting portion, and a fourth connecting portion, wherein the first connecting portion is connected between the first branch portion and the second branch portion, the second connecting portion and the third connecting portion are connected between the second branch portion and the third branch portion, and the fourth connecting portion is connected between the third branch portion and the fourth branch portion.

In some embodiments, the feeding point is between the second connecting portion and the third connecting portion of the slot.

In some embodiments, the combination of the first connecting portion, the second connecting portion, the third connecting portion, and the fourth connecting portion of the slot presents a straight shape.

In some embodiments, the first branch portion, the second branch portion, the third branch portion, and the fourth branch portion of the slot each have a straight shape.

In some embodiments, the first branch portion, the second branch portion, the third branch portion, and the fourth branch portion of the slot are substantially parallel to each other.

In some embodiments, the first leg portion and the second leg portion of the slot each have a relatively large width, and the third leg portion and the fourth leg portion of the slot each have a relatively small width.

In some embodiments, the total length of the first branch portion, the first connection portion, and the second connection portion of the slot is between 0.5 times and 1 times the wavelength of the center frequency of the first frequency band.

In some embodiments, the total length of the third branch portion and the third connecting portion of the slot is between 0.5 times and 1 time wavelength of the center frequency of the second frequency band.

In some embodiments, the total length of the fourth branch portion, the fourth connecting portion, and the third connecting portion of the slot is between 0.5 times and 1 times the wavelength of the center frequency of the third frequency band.

In some embodiments, the second connecting portion and the third connecting portion of the slot each exhibit an unequal-width L-shape.

In some embodiments, the antenna structure further comprises: and a third metal part coupled to the grounding metal part, wherein the third metal part is arranged relative to the first metal part.

In some embodiments, the antenna structure further comprises: a fourth metal portion coupled to the grounding metal portion, wherein the fourth metal portion is disposed opposite to the second metal portion.

In some embodiments, the second leg portion of the slot further includes a right angle bend end region.

In some embodiments, the third and fourth leg portions of the slot are substantially perpendicular to each other.

Compared with the prior art, the invention has the advantages of at least small size, wide frequency band, single-layer planarization design and the like, so that the invention is very suitable for being applied to various mobile communication devices.

Drawings

Fig. 1 shows a schematic diagram of an antenna structure according to an embodiment of the invention.

Fig. 2 shows a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the invention.

Fig. 3 shows a schematic diagram of an antenna structure according to an embodiment of the invention.

Fig. 4 shows a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the invention.

Fig. 5 shows a schematic diagram of an antenna structure according to an embodiment of the invention.

Fig. 6 shows a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the invention.

Description of main reference numerals:

100. 300, 500 antenna structure

110. 310, 510 Grounded metal part

121. 321, 521 First metal part

122. 322, 522 Second metal portion

130. 330, 530 Slotted holes

140. 340, 540 Slot first branch portion

141. 341, 541 First closed end

150. Second branch portion of slot 350, 550

151. 351, 551 Second closed end

160. Third branch portion of 360 and 560 slots

161. 361, 561 Third closed end

170. Fourth branch portion of 370, 570 slots

171. 371, 571 Fourth closed end

185. 385, 585 First connecting portion of slot

186. 386, 586 Slot second connecting portion

187. 387, 587 Slot third connecting portion

188. 388, 588 Slot fourth connecting portion

190. 390, 590 Non-conductor support element

323. 523 Third metal part

324. 524 Fourth metal part

555. End region of right angle bend

FP1, FP2, FP3 feed points

FB1, FB4, FB7 first frequency band

FB2, FB5, FB8 second frequency band

FB3, FB6, FB9 third frequency band

Length of L1, L2, L3

Width of W1, W2, W3, W4

Detailed Description

The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments of the invention.

Certain terms are used throughout the description and claims to refer to particular components. Those of ordinary skill in the art will appreciate that a hardware manufacturer may refer to the same element by different names. The description and claims do not take the form of an element differentiated by name, but rather by functional differences. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The term "substantially" means that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, and achieve the basic technical effect. In addition, the term "coupled" as used herein includes any direct or indirect electrical connection. Accordingly, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

The following disclosure provides many different embodiments, or examples, for implementing different features of the disclosure. The following disclosure describes specific examples of various components and arrangements thereof to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the disclosure describes a first feature being formed on or over a second feature, that means that it may include embodiments in which the first feature is in direct contact with the second feature, and that additional features may be formed between the first feature and the second feature, such that the first feature and the second feature may not be in direct contact. In addition, the following disclosure of different examples may reuse the same reference symbols or (and) labels. These repetition are for the purpose of simplicity and clarity and do not in itself dictate a particular relationship between the various embodiments or (and) configurations discussed.

Fig. 1 shows a schematic diagram of an antenna structure (Antenna Structure) 100 according to an embodiment of the present invention. The antenna structure 100 can be applied to a mobile device, for example: a Smart Phone, a Tablet Computer, or a notebook Computer (Notebook Computer). As shown in fig. 1, the antenna structure 100 includes a Ground metal portion (Ground METAL ELEMENT) 110, a first metal portion (METAL ELEMENT) 121, and a second metal portion 122.

The grounding metal portion 110 has a Slot (Slot) 130, which is a non-metal region. A feed-in point (Feeding Point) FP1 is located on the first metal portion 121. The feed point FP1 may be coupled to an anode of a Signal Source (Signal Source), and a cathode of the Signal Source may be coupled to the ground metal portion 110. For example, the signal source (not shown) may be a Radio Frequency (RF) module, which may be used to excite the antenna structure 100. The first metal portion 121 and the second metal portion 122 are both coupled to the grounding metal portion 110 and can extend toward the inside of the slot 130, so that the slot 130 can have an irregular shape as a whole.

The slot 130 includes a first Branch Portion 140, a second Branch Portion 150, a third Branch Portion 160, and a fourth Branch Portion 170, wherein the first metal 121 is interposed between the second Branch Portion 150 and the third Branch Portion 160, and the second metal 122 is interposed between the third Branch Portion 160 and the fourth Branch Portion 170. For example, the first branch portion 140, the second branch portion 150, the third branch portion 160, and the fourth branch portion 170 of the slot 130 may each have a substantially straight shape, but are not limited thereto. In some embodiments, the first leg portion 140, the second leg portion 150, the third leg portion 160, and the fourth leg portion 170 of the slot 130 are substantially parallel to one another. The first and second branch portions 140 and 150 of the slot 130 may be located on the same side (e.g., left side) of the feed point FP1, and the third and fourth branch portions 160 and 170 of the slot 130 may be located on the opposite side (e.g., right side) of the feed point FP 1. In detail, the first branch portion 140 of the slot 130 has a first Closed End 141, the second branch portion 150 of the slot 130 has a second Closed End 151, the third branch portion 160 of the slot 130 has a third Closed End 161, and the fourth branch portion 170 of the slot 130 has a fourth Closed End 171. In some embodiments, the first closed end 141, the second closed end 151, the third closed end 161, and the fourth closed end 171 are all substantially aligned.

In some embodiments, the slot 130 further includes a first connecting portion (Connection Portion) 185, a second connecting portion 186, a third connecting portion 187, and a fourth connecting portion 188, wherein the first connecting portion 185 is connected between the first leg portion 140 and the second leg portion 150, the second connecting portion 186 and the third connecting portion 187 are both connected between the second leg portion 150 and the third leg portion 160, and the fourth connecting portion 188 is connected between the third leg portion 160 and the fourth leg portion 170. For example, the combination of the first, second, third, and fourth connection portions 185, 186, 187, 188 of the slot 130 may generally take on a straight bar shape, but is not limited thereto. In detail, the feed point FP1 is between the second connecting portion 186 and the third connecting portion 187 of the slot 130.

In some embodiments, the antenna structure 100 further includes a non-conductive support element (Nonconductive Support Element) 190. The ground metal portion 110, the first metal portion 121, and the second metal portion 122 may together form a Planar Structure (Planar Structure) and be disposed on the non-conductive support element 190. The non-conductive support element 190 may be a plastic element, a printed circuit board (Printed Circuit Board, PCB), or a flexible circuit board (Flexible Circuit Board, FCB). For example, if the non-conductive support element 190 is a plastic housing, the grounding metal portion 110, the first metal portion 121, and the second metal portion 122 can be attached to the non-conductive support element 190 by a Laser Direct Structuring (LDS) technique.

Fig. 2 shows a Voltage Standing Wave Ratio (VSWR) diagram of the antenna structure 100 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the Voltage standing wave Ratio. According to the measurement result of fig. 2, the antenna structure 100 may cover a first Frequency Band (Frequency Band) FB1, a second Frequency Band FB2, and a third Frequency Band FB3, wherein the first Frequency Band FB1 is between 2400MHz and 2500MHz, the second Frequency Band FB2 is between 5000MHz and 6000MHz, and the third Frequency Band FB3 is between 6000MHz and 7125 MHz. In some embodiments, the Radiation Gain (Radiation Gain) of the antenna structure 100 in the first frequency band FB1 may be up to about-2.61 dB, the Radiation Gain of the antenna structure 100 in the second frequency band FB2 may be up to about-4 dB, and the Radiation Gain of the antenna structure 100 in the third frequency band FB3 may be up to about-3.71 dB. Thus, the antenna structure 100 will be capable of supporting at least broadband operation in both Wi-Fi5 (IEEE 802.11 ac) and Wi-Fi 6 (IEEE 802.11 ax) standards.

In some embodiments, the principle of operation of the antenna structure 100 may be as follows. The first branch portion 140, the first connecting portion 185, and the second connecting portion 186 of the slot 130 can jointly excite the first frequency band FB1. The third leg portion 160 and the third connecting portion 187 of the slot 130 may jointly excite the second frequency band FB2 as described above. The fourth leg portion 170, the fourth connecting portion 188, and the third connecting portion 187 of the slot 130 may collectively excite the third frequency band FB3 as described above. The first metal portion 121 may provide an Inductance (Inductance) to fine tune the impedance matching of the first frequency band FB1 (IMPEDANCE MATCHING). The second metal portion 122 may also provide an inductive property to fine tune the impedance matching of the second frequency band FB2 and the third frequency band FB3. In addition, the second branch portion 150 of the slot 130 can simultaneously fine tune the impedance matching of the first frequency band FB1, the second frequency band FB2, and the third frequency band FB3.

In some embodiments, the element dimensions of the antenna structure 100 may be as follows. The total length L1 of the first branch portion 140, the first connection portion 185, and the second connection portion 186 of the slot 130 (i.e., the total length L1 from the feed point FP1, passing through the second connection portion 186 and the first connection portion 185, and then to the first closed end 141 of the first branch portion 140) may be between 0.5 times and 1 time (0.5λ and 1λ) of the wavelength of the center frequency (Central Frequency) of the first frequency band FB1 of the antenna structure 100. The total length L2 of the third branch portion 160 and the third connecting portion 187 of the slot 130 (i.e., the total length L2 from the feed point FP1, through the third connecting portion 187, and to the third closed end 161 of the third branch portion 160) may be between 0.5 times and 1 time wavelength (0.5λ and 1λ) of the center frequency of the second frequency band FB2 of the antenna structure 100. The total length L3 of the fourth branch portion 170, the fourth connecting portion 188, and the third connecting portion 187 of the slot 130 (i.e., the total length L3 from the feed point FP1, through the third connecting portion 187 and the fourth connecting portion 188, and to the fourth closed end 171 of the fourth branch portion 170) may be between 0.5 times and 1 times (0.5λ and 1λ) the wavelength of the center frequency of the third frequency band FB3 of the antenna structure 100. The first leg portion 140 and the second leg portion 150 (or the first closed end 141 and the second closed end 151) of the slot 130 each have a relatively large width W1, W2, while the third leg portion 160 and the fourth leg portion 170 (or the third closed end 161 and the fourth closed end 171) of the slot 130 each have a relatively small width W3, W4. The widths W1, W2, W3, W4 may be all greater than or equal to 0.3mm. For example, the width W1 of the first leg portion 140 may be more than 3 times the width W4 of the fourth leg portion 170, and the width W2 of the second leg portion 150 may be more than 2 times the width W3 of the third leg portion 160. The thickness of the non-conductor support element 190 may be greater than or equal to 0.2mm. The overall length of the antenna structure 100 is about 8mm and the overall width is about 25mm. The above size ranges are found from a number of experimental results, which helps to optimize the operation bandwidth (Operation Bandwidth) and impedance matching of the antenna structure 100.

Various alternative embodiments of the antenna structure 100 will be described below. It is to be understood that the drawings and descriptions are proffered by way of example only and are not intended to limit the scope of the invention.

Fig. 3 shows a schematic diagram of an antenna structure 300 according to an embodiment of the invention. Fig. 3 is similar to fig. 1. In the embodiment of fig. 3, the antenna structure 300 includes a ground metal portion 310, a first metal portion 321, a second metal portion 322, a third metal portion 323, a fourth metal portion 324, and a non-conductive supporting element 390, wherein a feed point FP2 is located on the first metal portion 321. In detail, the grounding metal portion 310 has a slot 330, wherein the slot 330 includes: a first leg portion 340 having a first closed end 341, a second leg portion 350 having a second closed end 351, a third leg portion 360 having a third closed end 361, a fourth leg portion 370 having a fourth closed end 371, a first connection portion 385, a second connection portion 386, a third connection portion 387, and a fourth connection portion 388.

The main difference from the antenna structure 100 of the embodiment of fig. 1 is that the first metal portion 321 may substantially take on an L shape, the second metal portion 322 may substantially take on a straight shape, the third metal portion 323 may substantially take on a smaller square shape, and the fourth metal portion 324 may substantially take on a larger square shape. In addition, the second connection portion 386 and the third connection portion 387 of the slot 330 may each generally exhibit an unequal-width L-shape. The third metal portion 323 and the fourth metal portion 324 are coupled to the grounding metal portion 310 and can extend toward the inside of the slot 330. The third metal portion 323 may be disposed opposite to the first metal portion 321, and may be separated from each other by a second connecting portion 386 of the slot 330. The fourth metal portion 324 can be disposed opposite the second metal portion 322, which can be separated by a fourth connecting portion 388 of the slot 330.

Fig. 4 shows a voltage standing wave ratio diagram of an antenna structure 300 according to an embodiment of the invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the voltage standing wave ratio. According to the measurement result of fig. 4, the antenna structure 300 may cover a first frequency band FB4, a second frequency band FB5, and a third frequency band FB6, wherein the first frequency band FB4 is between 2400MHz and 2500MHz, the second frequency band FB5 is between 5000MHz and 6000MHz, and the third frequency band FB6 is between 6000MHz and 7125 MHz. In some embodiments, the radiation gain of the antenna structure 300 in the first frequency band FB4 may be up to about-3.02 dB, the radiation gain of the antenna structure 300 in the second frequency band FB5 may be up to about-3.22 dB, and the radiation gain of the antenna structure 300 in the third frequency band FB6 may be up to about-3.43 dB. Generally, the addition of the third metal portion 323 and the fourth metal portion 324 provides additional inductive properties and allows for the simultaneous trimming of the impedance matching of the first frequency band FB4, the second frequency band FB5, and the third frequency band FB 6. The remaining features of the antenna structure 300 of fig. 3 are similar to those of the antenna structure 100 of fig. 1, so that similar operation effects can be achieved in both embodiments.

Fig. 5 shows a schematic diagram of an antenna structure 500 according to an embodiment of the invention. Fig. 5 is similar to fig. 1. In the embodiment of fig. 5, the antenna structure 500 includes a ground metal portion 510, a first metal portion 521, a second metal portion 522, a third metal portion 523, a fourth metal portion 524, and a non-conductive supporting element 590, wherein a feed point FP3 is located on the first metal portion 521. In detail, the grounding metal portion 510 has a slot 530, wherein the slot 530 includes: a first leg portion 540 having a first closed end 541, a second leg portion 550 having a second closed end 551, a third leg portion 560 having a third closed end 561, a fourth leg portion 570 having a fourth closed end 571, a first connecting portion 585, a second connecting portion 586, a third connecting portion 587, and a fourth connecting portion 588.

The main difference from the antenna structure 100 of the embodiment of fig. 1 is that the first metal portion 521 may substantially take on an L shape, the second metal portion 522 may substantially take on a larger square, the third metal portion 523 may substantially take on a smaller square, and the fourth metal portion 524 may substantially take on an elongated rectangle. In addition, the second leg portion 550 of the slot 530 may further include a right angle bent end region 555 (adjacent to the second closed end 551), and the third and fourth leg portions 560, 570 of the slot 530 may be substantially perpendicular to each other. The third metal portion 523 and the fourth metal portion 524 are coupled to the ground metal portion 510 and can extend toward the inside of the slot 530. The third metal portion 523 may be disposed opposite to the first metal portion 521 and may be separated from the first metal portion 521 by the second connecting portion 586 of the slot 530. The fourth metal portion 524 may be disposed opposite the second metal portion 522 and may be separated by a fourth branch portion 570 of the slot 530.

Fig. 6 shows a voltage standing wave ratio diagram of an antenna structure 500 according to an embodiment of the invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the voltage standing wave ratio. According to the measurement result of fig. 6, the antenna structure 500 may cover a first frequency band FB7, a second frequency band FB8, and a third frequency band FB9, wherein the first frequency band FB7 is between 2400MHz and 2500MHz, the second frequency band FB8 is between 5000MHz and 6000MHz, and the third frequency band FB9 is between 6000MHz and 7125 MHz. In some embodiments, the radiation gain of the antenna structure 500 in the first frequency band FB7 may be up to about-2.51 dB, the radiation gain of the antenna structure 500 in the second frequency band FB8 may be up to about-3.57 dB, and the radiation gain of the antenna structure 500 in the third frequency band FB9 may be up to about-3.62 dB. Generally, the right angle bent end region 555 of the second branch portion 550 of the slot 530 can fine tune the impedance matching of the second frequency band FB8 and the third frequency band FB9, and the third branch portion 560 and the fourth branch portion 570, which are substantially orthogonal to each other, can increase the operation bandwidth of the second frequency band FB8 and the third frequency band FB 9. The remaining features of the antenna structure 500 of fig. 5 are similar to those of the antenna structure 100 of fig. 1, so that similar operation effects can be achieved in both embodiments.

The present invention proposes a novel antenna structure. Compared with the prior art, the invention has the advantages of at least small size, wide frequency band, single-layer planarization design and the like, so that the invention is very suitable for being applied to various mobile communication devices.

It should be noted that the device size, device shape, and frequency range are not limitations of the present invention. The antenna designer may adjust these settings according to different needs. The antenna structure of the present invention is not limited to the state illustrated in fig. 1 to 6. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1-6. In other words, not all of the illustrated features need be implemented in the antenna structure of the present invention at the same time.

Ordinal numbers such as "first," "second," "third," and the like in the description and in the claims are used for distinguishing between two different elements having the same name and not necessarily for describing a sequential order.

While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An antenna structure, the antenna structure comprising:

A grounding metal part, which is provided with a slot hole;

A first metal part, wherein a feed-in point is positioned on the first metal part; and

A second metal portion, wherein the first metal portion and the second metal portion are coupled to the grounding metal portion and extend toward the inside of the slot;

Wherein the slot comprises a first branch portion, a second branch portion, a third branch portion, and a fourth branch portion;

Wherein the first metal portion is interposed between the second branch portion and the third branch portion, and the second metal portion is interposed between the third branch portion and the fourth branch portion;

Wherein the width of the second branch portion is more than 2 times of the width of the third branch portion.

2. The antenna structure of claim 1, further comprising:

the non-conductor support element, wherein the grounding metal part, the first metal part and the second metal part are all arranged on the non-conductor support element.

3. The antenna structure of claim 2, wherein the non-conductive support element is a plastic element, a printed circuit board, or a flexible circuit board.

4. The antenna structure of claim 1, wherein the first branch portion and the second branch portion of the slot are located at one side of the feed point, and the third branch portion and the fourth branch portion of the slot are located at the opposite side of the feed point.

5. The antenna structure of claim 1, wherein the first leg portion of the slot has a first closed end, the second leg portion of the slot has a second closed end, the third leg portion of the slot has a third closed end, and the fourth leg portion of the slot has a fourth closed end.

6. The antenna structure of claim 1, wherein the antenna structure comprises a first frequency band, a second frequency band, and a third frequency band, the first frequency band is between 2400MHz and 2500MHz, the second frequency band is between 5000MHz and 6000MHz, and the third frequency band is between 6000MHz and 7125 MHz.

7. The antenna structure of claim 6, wherein the slot further comprises a first connecting portion, a second connecting portion, a third connecting portion, and a fourth connecting portion, the first connecting portion being connected between the first branch portion and the second branch portion, the second connecting portion and the third connecting portion being connected between the second branch portion and the third branch portion, and the fourth connecting portion being connected between the third branch portion and the fourth branch portion.

8. The antenna structure of claim 7, wherein the feed point is between the second connection portion and the third connection portion of the slot.

9. The antenna structure of claim 7, wherein a combination of the first connecting portion, the second connecting portion, the third connecting portion, and the fourth connecting portion of the slot exhibits a straight stripe shape.

10. The antenna structure of claim 1, wherein the first branch portion, the second branch portion, the third branch portion, and the fourth branch portion of the slot each have a straight shape.

11. The antenna structure of claim 1, wherein the first branch portion, the second branch portion, the third branch portion, and the fourth branch portion of the slot are substantially parallel to each other.

12. The antenna structure of claim 1, wherein the first branch portion and the second branch portion of the slot each have a relatively large width, and the third branch portion and the fourth branch portion of the slot each have a relatively small width.

13. The antenna structure of claim 7, wherein the total length of the first branch portion, the first connecting portion, and the second connecting portion of the slot is between 0.5 times and 1 time wavelength of the center frequency of the first frequency band.

14. The antenna structure of claim 7, wherein a total length of the third branch portion and the third connecting portion of the slot is between 0.5 times and 1 time wavelength of a center frequency of the second frequency band.

15. The antenna structure of claim 7, wherein the total length of the fourth branch portion, the fourth connecting portion, and the third connecting portion of the slot is between 0.5 times and 1 time wavelength of the center frequency of the third frequency band.

16. The antenna structure of claim 7, wherein the second connecting portion and the third connecting portion of the slot each exhibit an unequal width L-shape.

17. The antenna structure of claim 1, further comprising:

And a third metal part coupled to the grounding metal part, wherein the third metal part is arranged relative to the first metal part.

18. The antenna structure of claim 17, further comprising:

And a fourth metal portion coupled to the grounding metal portion, wherein the fourth metal portion is disposed opposite to the second metal portion.

19. The antenna structure of claim 1, wherein the second leg portion of the slot further comprises a right angle bend end region.

20. The antenna structure of claim 1, wherein the third branch portion and the fourth branch portion of the slot are substantially perpendicular to each other.

21. An antenna structure, the antenna structure comprising:

A grounding metal part, which is provided with a slot hole;

The slot hole also comprises a first connecting part, a second connecting part, a third connecting part and a fourth connecting part, wherein the first connecting part is connected between the first branch part and the second branch part, the second connecting part and the third connecting part are connected between the second branch part and the third branch part, and the fourth connecting part is connected between the third branch part and the fourth branch part;

wherein the combination of the first connecting portion, the second connecting portion, the third connecting portion, and the fourth connecting portion of the slot has a straight shape.

22. An antenna structure, the antenna structure comprising:

A grounding metal part, which is provided with a slot hole;

the antenna structure further includes:

A third metal portion coupled to the grounding metal portion, wherein the third metal portion is disposed opposite to the first metal portion; and