TWM637124U - Multi-band antenna device - Google Patents

Abstract

This case discloses a multi-band antenna device, including a dielectric substrate, a first grounding part, a first radiation part, a first short-circuit part, a second radiation part, a third radiation part, a second short-circuit part, a The fourth radiating part, a first feeding part and a second feeding part. An inverted T is formed between the second radiating part, the first radiating part, the first short-circuit part, the first grounding part, the second short-circuit part, the third radiating part and the fourth radiating part on the first surface of the dielectric substrate. shape spacing. The first feeding part is located on the first surface and is located at a non-central position within the inverted T-shaped distance, the second feeding part is located on the second surface of the dielectric substrate, and one side of the second feeding part utilizes at least one first via hole The first feed-in portion is electrically connected through the dielectric substrate, and the other side extends away from the first ground portion, so that the vertical projection of the second feed-in portion overlaps the inverted T-shaped distance.

Description

multi-band antenna assembly

This case relates to a multi-band antenna device that effectively reduces the size of the antenna.

With the evolution of wireless communication, the bandwidth and speed of the old WiFi cannot meet the needs of consumers. In order to solve the problem of bandwidth, the next-generation WiFi 6E technology has added a 6GHz frequency band to allow greater bandwidth to meet the needs of consumers. As far as antenna design is concerned, although increasing the bandwidth can increase the use range of wireless communication, the difficulty of antenna design will also increase. In addition, in recent years, the high screen-to-body ratio of various electronic products has become a popular science. The standard of beauty is getting higher and higher. In order to respond to consumers' expectations for a beautiful appearance, the frame size of the notebook computer screen must be reduced. With the continuous shrinking of the size, the design space of the antenna is greatly reduced, so the traditional antenna design method can no longer meet the requirements. Today's design needs.

The antenna architecture generally used in notebook computers usually uses a planar inverted F antenna (PIFA design) to create different resonance frequencies with multiple metal branches to increase the bandwidth, although this technology can also achieve broadband However, due to the use of multiple metal branches, the size of the antenna is relatively large, and its area size is usually 8mm*40mm (320mm ² ), which cannot effectively reduce the size of the antenna.

This case provides a multi-band antenna device, including a dielectric substrate, a first grounding part, a first radiating part, a first short-circuit part, a second radiating part, a third radiating part, a The second short circuit part, a fourth radiation part, a first feeding part and a second feeding part. The dielectric substrate has an opposite first surface and a second surface, the first grounding part is located on the first surface, the first radiation part is located on the first surface and on the side of the first grounding part, and has a first outer side end and a first inner end, the first short-circuit portion is located on the first surface, and connects the first outer end and the first ground portion, the second radiation portion is located on the first surface and is located on one side of the first radiation portion, and the second One end of the two radiating parts is bent and connected to the first inner end. The third radiating part is located on the first surface and on the same side of the first grounding part as the first radiating part, and has a second outer end and a second inner end, the second inner end is close to the first inner end, and the second inner end is close to the first inner end. The second short-circuit part is located on the first surface and is connected to the second outer end and the first grounding part. The fourth radiating part is located on the first surface and is located on one side of the third radiating part. One end of the fourth radiating part is bent and connected to the first grounding part. The two inner ends form an inverted T-shaped distance between the second radiating part, the first radiating part, the first short-circuit part, the first grounding part, the second short-circuit part, the third radiating part and the fourth radiating part. The first feed-in portion is located on the first surface and is located at a non-central position within the inverted T-shaped distance, the second feed-in portion is located on the second surface, and one side of the second feed-in portion penetrates through the dielectric substrate through at least one first via hole The first feed-in portion is electrically connected, and the other side extends away from the first ground portion, so that the vertical projection of the second feed-in portion overlaps the inverted T-shaped distance.

To sum up, this project is a multi-band antenna device that can effectively reduce the size of the antenna. It uses the radiation characteristics of the slot antenna and selectively matches capacitive elements or distributed capacitors to achieve multi-band in a limited space. operate. Therefore, this project can effectively reduce the size of the antenna and support a wider range of frequency bands without increasing the space of the product system, so as to be applicable to multiple frequency bands of 2.41~2.48GHz and 5.150~7.125GHz, so it can meet the frequency band of WiFi 6E at the same time (5.925~7.125GHz).

10: Multi-band antenna device

12: Dielectric substrate

121: first surface

122: second surface

14: The first grounding part

16: The first radiation department

161: first outer end

162: first medial end

18: The first short-circuit part

20: The second radiation department

22: The third radiation department

221: second outer end

222: second inner end

24: The second short-circuit part

26: The Fourth Radiant Division

28: The first feed-in part

30: The second feed-in part

32: Signal source

34: Inverted T-shaped spacing

36: The first via hole

38: Second grounding part

40: Second via hole

42: System ground plane

44: capacitive element

46: Extension

48: Coupling metal part

50: The third via hole

D1: the first distance

D2: second spacing

FIG. 1 is a schematic structural diagram of a multi-band antenna device according to an embodiment of the present invention.

FIG. 2 is a structural bottom view of a multi-band antenna device according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of a multi-band antenna device according to another embodiment of the present application.

FIG. 4 is a schematic structural diagram of a multi-band antenna device according to yet another embodiment of the present application.

FIG. 5 is a structural bottom view of a multi-band antenna device according to yet another embodiment of the present application.

FIG. 6 is a distribution diagram of surface current paths excited at 2.45 GHz by a multi-band antenna device according to an embodiment of the present invention.

FIG. 7 is a distribution diagram of surface current paths excited at 6 GHz by a multi-band antenna device according to an embodiment of the present invention.

FIG. 8 is a schematic diagram of a simulation of the reflection coefficient (S11 parameter) generated by the multi-band antenna device according to the present invention.

Embodiments of this case will be described below in conjunction with related drawings. In these drawings, the same reference numerals denote the same or similar elements or circuits, it must be understood that although the terms "first", "second", etc. may be used herein to describe various elements, components, regions or functions , but these elements, components, regions and/or functions should not be limited by these terms, which are only used to distinguish one element, component, region or function from another element, component, region or function.

Please refer to Fig. 1 and Fig. 2 at the same time, the multi-band antenna device 10 of this case at least includes a dielectric substrate 12, a first ground portion 14, a first radiation portion 16, a first short-circuit portion 18, a second Radiating portion 20, a third radiating portion 22, a second short-circuit portion 24, a first Four radiation parts 26 , a first feeding part 28 , a second feeding part 30 , a signal source 32 and at least one first via hole 36 .

In the multi-band antenna device 10, the dielectric substrate 12 has a first surface 121 and a second surface 122 opposite to each other, and the dielectric substrate 12 is a common printed circuit board (PCB). The first ground portion 14 is located on the first surface 121 and adjacent to one edge of the dielectric substrate 12 . The first radiation portion 16 is located on the first surface 121 of the dielectric substrate 12 and on one side of the first ground portion 14 . The first radiation portion 16 has a first outer end 161 and a first inner end 162 . The first short-circuit portion 18 is located on the first surface 121, one end of the first short-circuit portion 18 is vertically connected to the first outer end 161 of the first radiation portion 16, and the other end extends toward the first ground portion 14 and is connected to the first ground portion 14. ground part 14. The second radiating portion 20 is located on the first surface 121 and on one side of the first radiating portion 16. One end of the second radiating portion 20 has a bend and is connected to the first inner end 162, so that the first radiating portion 16 and the first radiating portion 16 are connected to the first radiating portion 16. A first distance D1 is formed between the two radiation portions 20 . The third radiating part 22 is located on the first surface 121 and is located on the same side of the first grounding part 14 as the first radiating part 16. The third radiating part 22 has a second outer end 221 and a second inner end 222, and The second inner end 222 is close to the first inner end 162 of the first radiation portion 16 . The second short-circuit portion 24 is located on the first surface 121, one end of the second short-circuit portion 24 is vertically connected to the second outer end 221 of the third radiation portion 22, and the other end extends toward the first ground portion 14 and is connected to the first ground portion 14. ground part 14. The fourth radiating portion 26 is located on the first surface 121 and on one side of the third radiating portion 22 , one end of the fourth radiating portion 26 has a bend and is connected to the second inner end 222 , so that the third radiating portion 22 is connected to the fourth radiating portion 22 . A second distance D2 is formed between the radiation portions 26 .

Among them, the second radiating part 20, the first radiating part 16, the first short-circuit part 18, the first ground part 14, the second short-circuit part 24, the third radiating part 22 and the fourth radiating part 26 The surrounding area forms an inverted T-shaped space 34 . The first feeding part 28 is located on the first surface 121 and is located at a non-central position within the inverted T-shaped interval 34. In this embodiment, the first feeding part 28 is located between the third radiating part 22 and the first grounding part 14 In another embodiment, the first feeding portion 28 may also be located on the dielectric substrate 12 between the first radiating portion 16 and the first grounding portion 14 . The second feed-in portion 30 is located on the second surface 122, and one side of the second feed-in portion 30 is electrically connected to the first feed-in portion 28 through at least one first via 36 through the dielectric substrate 12. Take the two first via holes 36 as an example, but the present application is not limited thereto. The other side of the second feed-in portion 30 extends away from the first ground portion 14, so that the vertical projections of the second feed-in portion 30 partially overlap The inverted T-shaped spacing 34 . One end of the signal source 32 is connected to the first feeding part 28 , and the other end is connected to the first grounding part 14 , so that the radio frequency signal is transmitted and fed into the first feeding part 28 through the signal source 32 .

In one embodiment, taking the centerline of the dielectric substrate 12 as the axis of symmetry, the first radiating portion 16 is symmetrical to the third radiating portion 22, the first short-circuit portion 18 is symmetrical to the second short-circuit portion 24, and the second radiating portion 20 is symmetrical. The fourth radiating portion 26 is designed so that the first radiating portion 16 , the first short-circuit portion 18 , and the second radiating portion 20 are mirror-symmetrical to the third radiating portion 22 , the second short-circuit portion 24 , and the fourth radiating portion 26 .

In one embodiment, as shown in FIG. 1 and FIG. 2 , the multi-band antenna device 10 further includes a second ground portion 38 and a plurality of second via holes 40, and the second ground portion 38 is located on the second surface 122 of the dielectric substrate 12. On the top and corresponding to the first grounding portion 14 , the first grounding portion 14 is electrically connected to the second grounding portion 38 through the dielectric substrate 12 through a plurality of second via holes 40 .

In one embodiment, as shown in FIG. 1 and FIG. 2 , the outer side of the dielectric substrate 12 of the multi-band antenna device 10 is further provided with a system ground plane 42 , so that the ground plane 42 located on the first surface 121 Both the first ground portion 14 and the second ground portion 38 located on the second surface 122 are connected to the system ground plane 42 to form an electrical connection. In one embodiment, the system ground plane 42 can be an independent metal sheet, or it can be located on a metal plane of an electronic device. For example, the system ground plane 42 can be a metal frame of the electronic device or inside the casing of the electronic device. The metal sheet or sputtered metal part, but this case is not limited to this. For example, when the electronic device is a notebook computer, the system ground plane 42 may be the system ground portion of the notebook computer screen or metal parts such as EMI aluminum foil or sputtered metal areas in the notebook computer screen casing. Wherein, the shape and size of the system ground plane 42 drawn in the drawings are only for illustration, and the shape or size of the system ground plane 42 may change with the application of the multi-band antenna device 10, but it should not be limited to this .

In order to make the physical size of the multi-band antenna device 10 smaller, a capacitive element 44 can be added at the current zero point at the center of the inverted T-shaped distance 34 in this application. Please refer to FIG. 3 . The bottom view of the multi-band antenna device 10 shown in FIG. 3 is the same as that in FIG. 2 , so please refer to FIG. 2 and FIG. 3 at the same time. As shown in Figure 2 and Figure 3, the multi-band antenna device 10 of this case at least includes a dielectric substrate 12, a first ground portion 14, a first radiation portion 16, a first short-circuit portion 18, and a second radiation portion 20. A third radiating portion 22, a second short-circuit portion 24, a fourth radiating portion 26, a first feeding portion 28, a second feeding portion 30, a signal source 32, at least one first via hole 36, A second ground portion 38 , a plurality of second via holes 40 and a capacitive element 44 . The dielectric substrate 12 has a first surface 121 and a second surface 122. The first surface 121 is provided with a first grounding portion 14, a first radiation portion 16, a second radiation portion 20, a first short circuit portion 18, and a third radiation portion. 22 . The fourth radiating portion 26 , the second short circuit portion 24 , the first feeding portion 28 , the signal source 32 and the capacitive element 44 , and the second surface 122 is provided with the second feeding portion 30 and the second grounding portion 38 . Wherein the second radiating portion 20 has a first bend and is electrically connected to the first radiating portion 16. An inner end 162, the open end of the second radiating portion 20 is parallel to the first radiating portion 16, so that there is a first distance D1 between the first radiating portion 16 and the second radiating portion 20, and one end of the first short-circuit portion 18 is vertically connected At the first outer end 161 of the first radiating portion 16 , it extends toward the first ground portion 14 and is electrically connected to the first ground portion 14 . The fourth radiating portion 26 has a second inner end 222 that is bent once and is electrically connected to the third radiating portion 22. The open end of the fourth radiating portion 26 is parallel to the third radiating portion 22, so that the third radiating portion 22 and the fourth There is a second distance D2 between the radiating parts 26, and one end of the second short-circuit part 24 is vertically connected to the second outer end 221 of the third radiating part 22, extends toward the first ground part 14, and is electrically connected to the first ground part 14. sexual connection. Wherein, the above-mentioned second radiation portion 20, first radiation portion 16, first short-circuit portion 18, first ground portion 14, second short-circuit portion 24, third radiation portion 22, and fourth radiation portion 26 form a Inverted T-shaped pitch 34. The first feeding portion 28 is located within the inverted T-shaped interval 34 and between the third radiating portion 22 and the first grounding portion 14 . One side of the second feed-in portion 30 is electrically connected to the first feed-in portion 28 through at least one first via hole 36 penetrating the dielectric substrate 12. Here, two first via holes 36 are taken as an example, but this case does not Therefore, the other side of the second feed-in portion 30 extends away from the second ground portion 38 , so that the vertical projection of the second feed-in portion 30 partially overlaps the inverted T-shaped distance 34 . One end of the signal source 32 is connected to the first feeding part 28 , and the other end is connected to the first grounding part 14 , so that the radio frequency signal is transmitted and fed into the first feeding part 28 through the signal source 32 . The capacitive element 44 is connected between the first inner end 162 of the first radiating portion 16 and the second inner end 222 of the third radiating portion 22, so as to effectively control the frequency during low-frequency operation by adjusting the capacitance value of the capacitive element 44 Location. Except for the capacitive element 44 , other detailed structural descriptions can refer to the descriptions of the embodiments shown in FIG. 1 and FIG. 2 , so details are not repeated here.

Please refer to Fig. 4 and Fig. 5 at the same time, the multi-band antenna device 10 of this case, It at least includes a dielectric substrate 12, a first ground portion 14, a first radiation portion 16, a first short circuit portion 18, a second radiation portion 20, a third radiation portion 22, a second short circuit portion 24, a The fourth radiation part 26, an extension part 46, a first feed-in part 28, a second feed-in part 30, a coupling metal part 48, a signal source 32, a first via hole 36, a second ground part 38, a plurality of The second via hole 40 and a third via hole 50 . The dielectric substrate 12 has a first surface 121 and a second surface 122. The first surface 121 is provided with a first grounding portion 14, a first radiation portion 16, a first short circuit portion 18, a second radiation portion 20, and a third radiation portion. 22. The second short circuit part 24, the fourth radiation part 26, the extension part 46, the first feed part 28 and the signal source 32, the second surface 122 is provided with the second feed part 30, the coupling metal part 48 and a second ground Section 38. An inverted T is formed between the second radiation portion 20, the first radiation portion 16, the first short-circuit portion 18, the first ground portion 14, the second short-circuit portion 24, the third radiation portion 22 and the fourth radiation portion 26. Shape spacing 34. The first feeding portion 28 is located within the inverted T-shaped interval 34 and between the third radiating portion 22 and the first grounding portion 14 . One side of the second feed-in portion 30 is electrically connected to the first feed-in portion 28 through two first via holes 36 through the dielectric substrate 12 , and the other side of the second feed-in portion 30 extends away from the second ground portion 38 , The vertical projection of the second feeding portion 30 partially overlaps the inverted T-shaped distance 34 . Wherein, the extension part 46 is connected to the bending part of the second radiating part 20 and extends towards the direction of the fourth radiating part 26, the coupling metal part 48 is located on the second surface 122, and one end of the coupling metal part 48 passes through a third via hole 50 penetrates the dielectric substrate 12 and is electrically connected to the fourth radiation portion 26, and the other end extends toward the direction of the vertical projection position of the extension portion 46, so that the vertical projection of the coupling metal portion 48 and the extension portion 46 partially overlaps, thereby serving as a Distributed capacitance to adjust the frequency position during low-frequency operation. For the rest of the detailed structural description, please refer to the description of the embodiment shown in FIG. 1 and FIG. 2 , so it will not be repeated here.

As shown in Fig. 1 to Fig. 5, the multi-band antenna device 10 of this case has the second radiating part 20, the first radiating part 16, the first short-circuit part 18, the first ground part 14, the second short-circuit part 24, the third The inverted T-shaped distance 34 formed between the radiating part 22 and the fourth radiating part 26 constitutes the basic structure of the slot antenna and has the characteristics of slot radiation. Furthermore, in order to allow the radio frequency signal to be electrically coupled to the inverted T-shaped space 34 smoothly, the first ground portion 14 is electrically connected to the second ground portion 38 on the second surface 122 through a plurality of second via holes 40, similarly , the first feed-in portion 28 is also provided with a first via hole 36, so that the first feed-in portion 28 is electrically connected to the second feed-in portion 30 located on the second surface 122 by using the first via hole 36, thereby increasing practical application and Feasibility of mass production.

In one embodiment, as shown in FIGS. , the fourth radiating part 26, the first feeding part 28, the second feeding part 30, the second grounding part 38, the extension part 46 and the coupling metal part 48 are made of conductive metal materials, such as silver, copper, aluminum , iron or its alloys, etc., but this case is not limited to this.

In the multi-band antenna device 10 of this application, please also refer to FIG. 3 , and take the multi-band antenna device 10 in FIG. 3 as an example. When operating in the low frequency band, 2.45 GHz is actually taken as an example. As shown in FIGS. The second feeding part 30 couples the radio frequency signal to the inverted T-shaped spacing 34, so that the multi-band antenna device 10 has the radiation characteristics of a slot antenna, and the electric field energy in the low-frequency 2.45 GHz band will be distributed in the inverted T-shaped spacing 34 to form resonance The resonant mode of the slotted hole antenna with a path approximately 0.25 times the wavelength is shown in Figure 6. When operating in the high frequency band, actually take 6GHz as an example, as shown in Figure 3 and Figure 7, the signal source 32 generates a radio frequency signal, and also In this way, the radio frequency signal is fed into the second feed part 30 from the first feed part 28, so that the radio frequency signal is coupled to the inverted T-shaped spacing 34 through the second feed part 30, so as to form a closed slot antenna with a resonance path of about 0.5 times the wavelength In the resonant mode, the electric field strength point of this mode will appear at the center of the inverted T-shaped space 34, but for the current, this position will be a current zero point, as shown in FIG. 7 . Furthermore, adding a capacitive element 44 at the current zero point can effectively control the frequency position of the low frequency by adjusting its capacitance value, so that the low frequency band of the multi-band antenna device 10 can meet the 2.41GHz-2.48GHz operation. The effect of reducing the size of the antenna can be achieved. In addition, in this case, by adjusting the extension lengths of the second radiation portion 20 and the fourth radiation portion 26, the impedance matching of the high frequency band can be effectively improved.

The multi-band antenna device 10 proposed in this case does have a good reflection coefficient. Please refer to FIG. 3 and FIG. 8 at the same time. In this multi-band antenna device 10, the size of the entire multi-band antenna device 10 is 14mm*5mm (70mm ² ), so that when the multi-band antenna device 10 transmits radio frequency signals, To carry out the simulation analysis of S parameters. When the multi-band antenna device 10 operates in the low-frequency operating frequency band and the high-frequency operating frequency band respectively, the S-parameter simulation results are shown in FIG. 8 . It can be seen from the curves shown in FIG. The reflection coefficients (S11) shown in the formula are all less than -5dB (S11<-5dB), which proves that the reflection coefficients are good in both the low-frequency operating frequency band and the high-frequency operating frequency band, which can be satisfied between 2.41~2.48GHz and 5.15~7.125GHz Multi-band, but also in line with the operating frequency band of WiFi 6E. Therefore, the multi-band antenna device 10 in this case uses a slotted antenna structure and is equipped with a capacitive element 44 to effectively reduce the size, and only needs a space of 14mm*5mm (70mm ² ) to meet the multi-band antenna requirements.

To sum up, this project is a multi-band antenna device that can effectively reduce the size of the antenna. It uses the radiation characteristics of the slot antenna and selectively matches capacitive elements or distributed capacitors to achieve multi-band in a limited space. operate. Therefore, this case can be Under the premise of the product system space, the size of the antenna is effectively reduced and a wider range of frequency bands is supported, so as to be applicable to multiple frequency bands of 2.41~2.48GHz and 5.150~7.125GHz, so it can meet the frequency band of WiFi 6E (5.925~7.125GHz) at the same time.

The above-mentioned embodiments are only to illustrate the technical ideas and characteristics of this case. Equal changes or modifications made to the disclosed spirit should still be covered within the scope of the patent application in this case.

10: Multi-band antenna device

12: Dielectric substrate

121: first surface

14: The first grounding part

16: The first radiation department

161: first outer end

162: first medial end

18: The first short-circuit part

20: The second radiation department

22: The third radiation department

221: second outer end

222: second inner end

24: The second short-circuit part

26: The Fourth Radiant Division

28: The first feed-in part

30: The second feed-in part

32: Signal source

34: Inverted T-shaped spacing

36: The first via hole

40: Second via hole

42: System ground plane

D1: the first distance

D2: second spacing

Claims (21)

A multi-band antenna device, comprising: A dielectric substrate has a first surface and a second surface opposite to each other; a first ground portion located on the first surface; a first radiating portion, located on the first surface and on one side of the first grounding portion, and has a first outer end and a first inner end; a first short-circuit portion located on the first surface and connected to the first outer end and the first ground portion; a second radiating portion, located on the first surface and on one side of the first radiating portion, one end of the second radiating portion is bent and connected to the first inner end; A third radiating portion, located on the first surface and on the same side of the first grounding portion as the first radiating portion, has a second outer end and a second inner end, the second inner end is close to the first inner end; a second short-circuit portion located on the first surface and connected to the second outer end and the first ground portion; a fourth radiating portion, located on the first surface and on one side of the third radiating portion, one end of the fourth radiating portion is bent and connected to the second inner end, so that the second radiating portion, the first radiating portion part, the first short-circuit part, the first ground part, the second short-circuit part, the third radiating part and the fourth radiating part form an inverted T-shaped distance; a first feeding portion located on the first surface at a non-central position within the inverted T-shaped interval; and A second feed-in portion is located on the second surface, one side of the second feed-in portion is electrically connected to the first feed-in portion through at least one first via hole through the dielectric substrate, and the other side faces away from the first feed-in portion. The direction of the grounding portion extends such that the vertical projection of the second feeding portion partially overlaps the inverted T-shaped distance. The multi-band antenna device as described in claim 1 further includes a signal source, one end of which is connected to the first feeding part, and the other end is connected to the first grounding part. The multi-band antenna device as claimed in claim 1, further comprising a second ground portion located on the second surface and corresponding to the first ground portion, and the first ground portion penetrates the dielectric substrate through a plurality of second via holes and electrically connected to the second ground portion. The multi-band antenna device as claimed in claim 3 further includes a system ground plane located on one side of the dielectric substrate, and the system ground plane is connected to the first ground portion and the second ground portion. The multi-band antenna device as claimed in claim 1, wherein the first feeding portion is located on the dielectric substrate between the first radiating portion and the first grounding portion. The multi-band antenna device as claimed in claim 1, wherein the first feeding portion is located on the dielectric substrate between the third radiating portion and the first grounding portion. The multi-band antenna device as described in claim 1, wherein the first radiating portion is symmetrical to the third radiating portion, the first short-circuiting portion is symmetric to the second short-circuiting portion, and the second radiating portion is symmetrical to the fourth radiating portion department. The multi-band antenna device as claimed in claim 1 further includes a capacitive element located on the first surface and connected between the first inner end and the second inner end. The multi-band antenna device as described in Claim 8 further includes a signal source, one end of which is connected to the first feeding part, and the other end is connected to the first grounding part. The multi-band antenna device as claimed in claim 8, further comprising a second ground portion located on the second surface and corresponding to the first ground portion, and the first ground portion penetrates the dielectric substrate through a plurality of second via holes and electrically connected to the second ground portion. The multi-band antenna device as claimed in claim 10 further includes a system ground plane located on one side of the dielectric substrate, and the system ground plane is connected to the first ground portion and the second ground portion. The multi-band antenna device as claimed in claim 8, wherein the first feeding portion is located on the dielectric substrate between the first radiating portion and the first grounding portion. The multi-band antenna device as claimed in claim 8, wherein the first feeding portion is located on the dielectric substrate between the third radiating portion and the first grounding portion. The multi-band antenna device as described in claim 8, wherein the first radiating portion is symmetrical to the third radiating portion, the first short-circuiting portion is symmetric to the second short-circuiting portion, and the second radiating portion is symmetrical to the fourth radiating portion department. The multi-band antenna device as described in Claim 1 further includes: an extension part located on the first surface, the extension part connects the bend of the second radiating part and extends toward the direction of the fourth radiating part; and A coupling metal part, located on the second surface, one end of the coupling metal part penetrates the dielectric substrate through a third via hole and is electrically connected to the fourth radiation part, and the other end extends toward the direction of the vertical projection of the extension part , and partially overlaps this vertical projection. The multi-band antenna device as claimed in claim 15 further includes a signal source, one end of which is connected to the first feeding part, and the other end is connected to the first grounding part. The multi-band antenna device as claimed in claim 15, further comprising a second ground portion located on the second surface and corresponding to the first ground portion, the first ground portion penetrates the dielectric substrate through a plurality of second via holes and electrically connected to the second ground portion. The multi-band antenna device as claimed in claim 17 further includes a system ground plane located on one side of the dielectric substrate, and the system ground plane is connected to the first ground portion and the second ground portion. The multi-band antenna device as claimed in claim 15, wherein the first feeding portion is located on the dielectric substrate between the first radiating portion and the first grounding portion. The multi-band antenna device as claimed in claim 15, wherein the first feeding portion is located on the dielectric substrate between the third radiating portion and the first grounding portion. The multi-band antenna device as claimed in claim 15, wherein the first radiating portion is symmetrical to the third radiating portion, the first short-circuiting portion is symmetric to the second short-circuiting portion, and the second radiating portion is symmetrical to the fourth radiating portion department.

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