CN118156768A - Antenna structure - Google Patents

Abstract

An antenna structure. The antenna structure includes: a metal structure, a grounding element, a feed radiation part, a first radiation part, a second radiation part, a parasitic radiation part, an adjustment circuit, and a non-conductor support element; the metal structure has a slot; the metal structure includes a first grounding part and a second grounding part, and the slot is between the first grounding part and the second grounding part; the feed radiation part has a feeding point; the first radiation part is coupled to the feed radiation part; the second radiation part is coupled to the feed radiation part, and the second radiation part and the first radiation part extend in substantially opposite directions; the parasitic radiation part is coupled to the grounding element, wherein the parasitic radiation part is adjacent to the first radiation part and the second radiation part; the adjustment circuit is coupled between the first grounding part and the second grounding part of the metal structure. The antenna structure of the present invention has the advantages of small size, wide bandwidth, low manufacturing cost, and beautification of the device appearance, so it is very suitable for application in various mobile communication devices.

Description

Antenna structure

Technical Field

The present invention relates to an antenna structure, and in particular to a wideband antenna structure.

Background technique

With the development of mobile communication technology, mobile devices have become increasingly popular in recent years, such as portable computers, mobile phones, multimedia players and other portable electronic devices with mixed functions. In order to meet people's needs, mobile devices usually have the function of wireless communication. Some cover long-distance wireless communication ranges, such as mobile phones using 2G, 3G, LTE (Long Term Evolution) systems and the 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz frequency bands used for communication, while some cover short-distance wireless communication ranges, such as Wi-Fi, Bluetooth systems using 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

Antennas are indispensable components in the field of wireless communications. If the bandwidth of an antenna used to receive or transmit signals is insufficient, the communication quality of a mobile device can be easily degraded. Therefore, how to design a small-sized, wide-bandwidth antenna element is an important issue for antenna designers.

Therefore, it is necessary to provide an antenna structure to solve the above problems.

Summary of the invention

In a preferred embodiment, the present invention proposes an antenna structure, comprising: a metal structure having a slot, wherein the metal structure includes a first grounding portion and a second grounding portion, and the slot is between the first grounding portion and the second grounding portion; a grounding element; a feed radiating portion having a feeding point; a first radiating portion coupled to the feed radiating portion; a second radiating portion coupled to the feed radiating portion, wherein the second radiating portion and the first radiating portion extend in substantially opposite directions; a parasitic radiating portion coupled to the grounding element, wherein the parasitic radiating portion is adjacent to the first radiating portion and the second radiating portion; an adjustment circuit coupled between the first grounding portion and the second grounding portion of the metal structure; and a non-conductive support element for supporting the grounding element, the feed radiating portion, the first radiating portion, the second radiating portion, the parasitic radiating portion, and the adjustment circuit.

In some embodiments, the slot of the metal mechanism component is in an L-shape.

In some embodiments, the slot of the metal structure component has a relatively wider open end and a relatively narrower closed end.

In some embodiments, the distance between the adjustment circuit and the closed end of the slot is between 3 mm and 7 mm.

In some embodiments, the first radiation portion is in a Z shape.

In some embodiments, the first radiating portion further includes a terminal widened portion.

In some embodiments, the second radiation portion is in the shape of a straight strip with unequal width.

In some embodiments, the second radiating portion includes a narrower portion and a wider portion, and the wider portion is coupled to the feeding radiating portion via the narrower portion.

In some embodiments, the parasitic radiation portion is in an L-shape.

In some embodiments, the parasitic radiation portion further has a corner notch.

In some embodiments, a first coupling gap is formed between the parasitic radiation portion and the first radiation portion, a second coupling gap is formed between the parasitic radiation portion and the second radiation portion, and a width of each of the first coupling gap and the second coupling gap is between 0.8 mm and 1.2 mm.

In some embodiments, the non-conductive support element has a first surface, a second surface, and a third surface, the first surface is between the second surface and the third surface, and the second surface and the third surface are both substantially perpendicular to the first surface.

In some embodiments, both the first radiation portion and the parasitic radiation portion extend from the first surface to the second surface of the non-conductive support element.

In some embodiments, the second radiating portion is disposed on a first surface of the non-conductive support element, and the grounding element is disposed on a third surface of the non-conductive support element.

In some embodiments, the antenna structure covers a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band, the first frequency band is between 617 MHz and 960 MHz, the second frequency band is between 1710 MHz and 2690 MHz, the third frequency band is between 3300 MHz and 5000 MHz, and the fourth frequency band is between 5150 MHz and 5925 MHz.

In some embodiments, the length of the slot is approximately equal to 0.25 wavelengths of the first frequency band.

In some embodiments, the total length of the feeding radiation portion and the first radiation portion is substantially equal to 0.25 times the wavelength of the second frequency band.

In some embodiments, the total length of the feeding radiation portion and the second radiation portion is substantially equal to 0.25 times the wavelength of the third frequency band.

In some embodiments, the length of the parasitic radiation portion is substantially equal to 0.25 times the wavelength of the second frequency band.

In some embodiments, the adjustment circuit includes: a first inductor element; a second inductor element; a capacitor element; a disconnect element; and a selection circuit, wherein the selection circuit selects one of the first inductor element, the second inductor element, the capacitor element, and the disconnect element as a target element according to a control signal, wherein the target element will be coupled between the first ground portion and the second ground portion of the metal structure component.

Compared with the traditional design, the present invention has at least the advantages of small size, wide bandwidth, low manufacturing cost, and beautified device appearance, so it is very suitable for application in various mobile communication devices (especially mobile devices with narrow bezels).

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view showing an antenna structure according to an embodiment of the present invention.

FIG. 2 is a partial perspective view of an antenna structure according to an embodiment of the present invention.

FIG. 3 is an exploded view of an antenna structure according to an embodiment of the present invention.

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

FIG. 5 is a schematic diagram showing an adjustment circuit according to an embodiment of the present invention.

FIG. 6 shows a radiation efficiency diagram of an antenna structure according to an embodiment of the present invention.

Main component symbols:

100 Antenna Structure

110 Metal components

120 slots

121 Open end of slot

122 Closed end of slot

130 Grounding element

140 Feed Radiator

141 Feeding the first end of the radiation part

142 Feed the second end of the radiation part

150 First Radiation

151 first end of the first radiation portion

152 The second end of the first radiating portion

158 The widened portion at the end of the first radiating portion

160 Second Radiation

161 The first end of the second radiation portion

162 The second end of the second radiation portion

164 The narrower part of the second radiant

165 The wider part of the second radiating portion

170 Parasitic Radiation Department

171 First end of parasitic radiation

172 Second end of the parasitic radiation portion

178 Corner gap of parasitic radiation

180 Adjustment circuit

181 First inductor element

182 Second inductor element

183 Capacitor Components

184 Circuit breaker

185 Selection Circuit

190 Non-conductive support element

199 Signal Source

CC1 First Curve

CC2 Second Curve

CC3 Third Curve

CC4 The Fourth Curve

D1, D2 spacing

E1 First surface of non-conductive support element

E2 Second surface of non-conductive support element

E3 Third surface of non-conductive support element

E4 Fourth surface of non-conductive support element

FB1 First frequency band

FB2 Second frequency band

FB3 Third frequency band

FB4 Band 4

FP Feed Point

GC1 First coupling gap

GC2 Second coupling gap

GP1 First grounding part

GP2 Second grounding part

L1, L2, L3, LS length

SC control signal

WS1, WS2 Width

Detailed ways

In order to make the purpose, features and advantages of the present invention more clearly understood, specific embodiments of the present invention are given below with reference to the accompanying drawings for detailed description as follows.

Certain words are used in the specification and claims to refer to specific components. It should be understood by those skilled in the art that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. The words "including" and "comprising" mentioned throughout the specification and claims are open-ended terms and should be interpreted as "including but not limited to". The word "substantially" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and achieve the basic technical effect. In addition, the word "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if the text describes a first device coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

The following disclosure provides many different embodiments or examples to implement the different features of the present invention. The following disclosure describes specific examples of various components and their arrangements to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if this specification describes a first feature formed on or above a second feature, it means that it may include an embodiment in which the first feature and the second feature are in direct contact, and may also include an embodiment in which an additional feature is formed between the first feature and the second feature, so that the first feature and the second feature may not be in direct contact. In addition, different examples in the following specification may reuse the same reference symbols or (and) marks. These repetitions are for the purpose of simplification and clarity, and are not intended to limit the specific relationship between the different embodiments or (and) structures discussed.

In addition, spatially relative terms such as "below," "beneath," "lower," "above," "upper," and the like are used to facilitate description of the relationship between one element or feature and another element or feature in the drawings. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings. The device may be rotated 90 degrees or in other orientations, and the spatially relative terms used herein should be interpreted accordingly.

FIG. 1 shows a front view of an antenna structure 100 according to an embodiment of the present invention. FIG. 2 shows a partial three-dimensional view of an antenna structure 100 according to an embodiment of the present invention. FIG. 3 shows an exploded view of an antenna structure 100 according to an embodiment of the present invention. Please refer to FIG. 1, FIG. 2, and FIG. 3 together. The antenna structure 100 can be applied to a mobile device, such as a smart phone, a tablet computer, or a notebook computer. In the embodiments of FIG. 1 , FIG. 2 , and FIG. 3 , the antenna structure 100 includes: a metal mechanism element 110, a ground element 130, a feeding radiation element 140, a first radiation element 150, a second radiation element 160, a parasitic radiation element 170, a tuning circuit 180, and a nonconductive support element 190, wherein the ground element 130, the feeding radiation element 140, the first radiation element 150, the second radiation element 160, and the parasitic radiation element 170 can all be made of metal materials, such as copper, silver, aluminum, iron, or alloys thereof.

The shape and type of the metal structure component 110 are not particularly limited in the present invention. For example, if the antenna structure 100 is applied to a notebook computer, the metal structure component 110 may be a metal back cover of the notebook computer, but is not limited thereto. The metal structure component 110 has a slot 120, wherein the slot 120 of the metal structure component 110 may be substantially L-shaped. In detail, the slot 120 may be an open slot, and may have a relatively wide open end 121 and a relatively narrow closed end 122.

In addition, the metal structure 110 further includes a first grounding portion GP1 and a second grounding portion GP2, wherein the slot 120 is located between the first grounding portion GP1 and the second grounding portion GP2. For example, the first grounding portion GP1 and the second grounding portion GP2 can each be implemented by a metal extension element (Metal Extension Element) coupled to the body of the metal structure 110, but is not limited thereto. In some embodiments, the antenna structure 100 can further include a non-conductive material (not shown), which can be filled in the slot 120 of the metal structure 110 to achieve a waterproof or dustproof function.

For example, the non-conductive support element 190 may be made of a plastic material. The non-conductive support element 190 may be used to carry the grounding element 130, the feeding radiation portion 140, the first radiation portion 150, the second radiation portion 160, the parasitic radiation portion 170, and the adjustment circuit 180. The non-conductive support element 190 may have a first surface E1 and a fourth surface E4 opposite to each other, and may also have a second surface E2 and a third surface E3 adjacent thereto, wherein the first surface E1 is between the second surface E2 and the third surface E3, and the second surface E2 and the third surface E3 are both substantially perpendicular to the first surface E1.

In detail, the first radiation portion 150 and the parasitic radiation portion 170 can extend from the first surface E1 of the non-conductor support element 190 to the second surface E2. The feed radiation portion 140, the second radiation portion 160, and the adjustment circuit 180 can be disposed on the first surface E1 of the non-conductor support element 190. The grounding element 130 can be disposed on the third surface E3 of the non-conductor support element 190. In addition, the fourth surface E4 of the non-conductor support element 190 can be adjacent to the slot 120 of the metal structure component 110. It should be noted that the term "adjacent" or "adjacent" in this specification can refer to the corresponding two elements having a distance less than a predetermined distance (for example, 10 mm or less), and can also include the situation where the corresponding two elements are in direct contact with each other (that is, the aforementioned distance is shortened to 0). In some embodiments, the fourth surface E4 of the non-conductor support element 190 and the metal structure component 110 are directly attached to each other, so that the non-conductor support element 190 can at least partially cover the slot 120 of the metal structure component 110.

In some embodiments, the first grounding portion GP1 of the metal structure 110 may extend to the second surface E2 of the non-conductive support element 190, and the second grounding portion GP2 of the metal structure 110 may extend to the third surface E3 of the non-conductive support element 190, but it is not limited thereto. In other embodiments, the grounding element 130, the feeding radiation portion 140, the first radiation portion 150, the second radiation portion 160, the parasitic radiation portion 170, and the adjustment circuit 180 may also be disposed only on the same surface of the non-conductive support element 190, for example, any one of the first surface E1, the second surface E2, the third surface E3, and the fourth surface E4.

The grounding element 130 can be coupled to the metal structure 110. The shape of the grounding element 130 is not particularly limited in the present invention. For example, the grounding element 130 can be implemented by a ground copper foil. In some embodiments, the grounding element 130 can also extend from the third surface E3 of the non-conductive support element 190 to the metal structure 110.

The feeding radiation portion 140 may be substantially rectangular. In detail, the feeding radiation portion 140 has a first end 141 and a second end 142, wherein a feeding point FP is located at the first end 141 of the feeding radiation portion 140, and the feeding point FP may also be coupled to a signal source 199. For example, the signal source 199 may be a radio frequency (RF) module, which may be used to excite the antenna structure 100. In some embodiments, the feeding radiation portion 140 has a first vertical projection on the metal structure component 110, wherein the first vertical projection may at least partially overlap with the slot 120 of the metal structure component 110.

The first radiating portion 150 may be substantially in a Z-shape. Specifically, the first radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the first radiating portion 150 is coupled to the second end 142 of the feed radiating portion 140, and the second end 152 of the first radiating portion 150 is an open end. In some embodiments, the first radiating portion 150 may further include a terminal widening portion 158, which may be located at the second end 152 of the first radiating portion 150. In some embodiments, the first radiating portion 150 has a second vertical projection on the metal structure component 110, wherein the second vertical projection may at least partially overlap with the slot 120 of the metal structure component 110.

The second radiating portion 160 may be substantially in the shape of a straight strip of unequal width. Specifically, the second radiating portion 160 has a first end 161 and a second end 162, wherein the first end 161 of the second radiating portion 160 is coupled to the second end 142 of the feeding radiating portion 140, and the second end 162 of the second radiating portion 160 is an open end. For example, the second end 162 of the second radiating portion 160 and the second end 152 of the first radiating portion 150 may extend substantially in opposite directions and away from each other. In some embodiments, the second radiating portion 160 includes a narrow portion 164 adjacent to the first end 161 and a wide portion 165 adjacent to the second end 162, wherein the wide portion 165 may be coupled to the feeding radiating portion 140 via the narrow portion 164. In some embodiments, the second radiating portion 160 has a third vertical projection on the metal structure component 110, wherein the third vertical projection may at least partially overlap with the slot 120 of the metal structure component 110.

The parasitic radiation portion 170 may be substantially L-shaped. Specifically, the parasitic radiation portion 170 has a first end 171 and a second end 172, wherein the first end 171 of the parasitic radiation portion 170 is coupled to the ground element 130, and the second end 172 of the parasitic radiation portion 170 is an open end. For example, the second end 172 of the parasitic radiation portion 170 and the second end 152 of the first radiation portion 150 may extend substantially in the same direction. In addition, the parasitic radiation portion 170 is adjacent to the first radiation portion 150 and the second radiation portion 160, wherein a first coupling gap GC1 may be formed between the parasitic radiation portion 170 and the first radiation portion 150, and a second coupling gap GC2 may be formed between the parasitic radiation portion 170 and the second radiation portion 160. In some embodiments, the parasitic radiation portion 170 further has a corner notch 178, which may be located at the second end 172 of the parasitic radiation portion 170. For example, the corner notch 178 may be substantially rectangular or square. In some embodiments, the parasitic radiation portion 170 has a fourth vertical projection on the metal structure component 110 , wherein the fourth vertical projection may at least partially overlap with the slot 120 of the metal structure component 110 .

The adjustment circuit 180 is coupled between the first ground portion GP1 and the second ground portion GP2 of the metal structure component 110. The internal structure of the adjustment circuit 180 is not particularly limited in the present invention. For example, the adjustment circuit 180 may include a switch circuit, one or more inductors, one or more capacitors, or (and) one or more resistors, but is not limited thereto. In some embodiments, the adjustment circuit 180 has a fifth vertical projection on the metal structure component 110, wherein the fifth vertical projection may at least partially overlap with the slot 120 of the metal structure component 110.

FIG. 4 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 results of FIG. 4 , the antenna structure 100 can cover a first frequency band FB1, a second frequency band FB2, a third frequency band FB3, and a fourth frequency band FB4. For example, the first frequency band FB1 can be between 617 MHz and 960 MHz, the second frequency band FB2 can be between 1710 MHz and 2690 MHz, the third frequency band FB3 can be between 3300 MHz and 5000 MHz, and the fourth frequency band FB4 can be between 5150 MHz and 5925 MHz. Therefore, the antenna structure 100 can at least support the sub-6 GHz broadband operation of the new generation 5G communication system (5th Generation Wireless System).

In some embodiments, the operating principle of the antenna structure 100 may be as follows. The slot 120 of the metal structure 110 may excite the aforementioned first frequency band FB1. The feed radiating portion 140 and the first radiating portion 150 may jointly excite to generate the aforementioned second frequency band FB2. The feed radiating portion 140 and the second radiating portion 160 may jointly excite to generate a fundamental resonant mode to form the aforementioned third frequency band FB3. The feed radiating portion 140 and the second radiating portion 160 may also jointly excite to generate a higher-order resonant mode to form the aforementioned fourth frequency band FB4. The parasitic radiating portion 170 may be coupled and excited by the first radiating portion 150 and the second radiating portion 160 to increase the operational bandwidth of the aforementioned second frequency band FB2, the third frequency band FB3, and the fourth frequency band FB4. According to actual measurement results, the end widening portion 158 of the first radiating portion 150 may be used to fine-tune the impedance matching of the aforementioned second frequency band FB2. The unequal width design of the second radiating portion 160 can be used to fine-tune the impedance matching of the third frequency band FB3 mentioned above. In addition, the corner notch 178 of the parasitic radiating portion 170 can also be used to fine-tune the impedance matching of the second frequency band FB2 mentioned above.

In some embodiments, the dimensions of the elements of the antenna structure 100 may be as follows. The length LS of the slot 120 of the metal structure 110 may be substantially equal to 0.25 times the wavelength (λ/4) of the first frequency band FB1 of the antenna structure 100. The width WS1 of the open end 121 of the slot 120 may be between 4 mm and 6 mm. The width WS2 of the closed end 122 of the slot 120 may be between 2 mm and 4 mm. The total length L1 of the feed radiation portion 140 and the first radiation portion 150 may be substantially equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2 of the antenna structure 100. The total length L2 of the feed radiation portion 140 and the second radiation portion 160 may be substantially equal to 0.25 times the wavelength (λ/4) of the third frequency band FB3 of the antenna structure 100. The length L3 of the parasitic radiation portion 170 may be substantially equal to 0.25 times the wavelength (λ/4) of the second frequency band FB2 of the antenna structure 100. The width of the first coupling gap GC1 may be between 0.8 mm and 1.2 mm. The width of the second coupling gap GC2 may be between 0.8 mm and 1.2 mm. The distance D1 between the adjustment circuit 180 and the closed end 122 of the slot 120 may be between 3 mm and 7 mm. The distance D2 between the adjustment circuit 180 and the parasitic radiation portion 170 may be between 3 mm and 7 mm. The above size ranges are obtained based on multiple experimental results, which help optimize the operating bandwidth and impedance matching of the antenna structure 100.

FIG5 is a schematic diagram of an adjustment circuit 180 according to an embodiment of the present invention. In the embodiment of FIG5 , the adjustment circuit 180 includes a first inductive element 181, a second inductive element 182, a capacitive element 183, an open-circuited element 184, and a selection circuit 185, wherein the inductance of the first inductive element 181 is greater than the inductance of the second inductive element 182.

In detail, one end of the selection circuit 185 is coupled to the first ground portion GP1, and the other end of the selection circuit 185 can be switched among the first inductor element 181, the second inductor element 182, the capacitor element 183, and the disconnection element 184 according to a control signal SC. In addition, the first inductor element 181, the second inductor element 182, the capacitor element 183, and the disconnection element 184 can be coupled to the second ground portion GP2, respectively.

Generally speaking, the selection circuit 185 can select one of the first inductor element 181, the second inductor element 182, the capacitor element 183, and the disconnection element 184 as a target element according to the control signal SC, wherein the aforementioned target element will be coupled between the first ground portion GP1 and the second ground portion GP2 of the metal structure component 110. For example, the control signal SC can be generated by a processor (Processor) (not shown) according to a user input, but it is not limited to this. In some embodiments, the inductance value of the first inductor element 181 can be between 8nH and 12nH, the inductance value of the second inductor element 182 can be between 0.1nH and 2nH, and the capacitance value (Capacitance) of the capacitor element 183 can be between 1pF and 5pF, but it is not limited to this.

FIG. 6 shows a diagram of the radiation efficiency (RadiationEfficiency) 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 radiation efficiency (%). As shown in FIG. 6 , a first curve CC1 represents the operating characteristics of the antenna structure 100 when the selection circuit 185 selects the capacitor element 183, a second curve CC2 represents the operating characteristics of the antenna structure 100 when the selection circuit 185 selects the disconnection element 184, a third curve CC3 represents the operating characteristics of the antenna structure 100 when the selection circuit 185 selects the first inductor element 181, and a fourth curve CC4 represents the operating characteristics of the antenna structure 100 when the selection circuit 185 selects the second inductor element 182. According to the measurement results of FIG. 6 , the addition of the adjustment circuit 180 will help to significantly improve the operating bandwidth of the first frequency band FB1 of the antenna structure 100. It must be understood that the above design method of the adjustment circuit 180 is only an example. In other embodiments, the internal structure of the adjustment circuit 180 can also be adjusted according to different needs.

The present invention proposes a novel antenna structure that can be integrated with a metal structure. Since the metal structure can be regarded as an extension of the antenna structure, it will not have a negative impact on the radiation performance of the antenna structure. Compared with the traditional design, the present invention has at least the advantages of small size, wide bandwidth, low manufacturing cost, and beautification of the device appearance, so it is very suitable for application in various mobile communication devices (especially mobile devices with narrow bezels).

It is worth noting that the above-mentioned component size, component shape, component parameters, and frequency range are not limiting conditions of the present invention. Antenna designers can adjust these settings according to different needs. The antenna structure of the present invention is not limited to the states illustrated in Figures 1 to 6. The present invention may only include any one or more features of any one or more embodiments of Figures 1 to 6. In other words, not all of the illustrated features must be implemented in the antenna structure of the present invention at the same time.

In the present specification and claims, ordinal numbers, such as "first", "second", "third", etc., have no sequential relationship with each other, and are only used to distinguish two different components with the same name.

Although the present invention is disclosed as above in terms of preferred embodiments, it is not intended to limit the scope of the present invention. Any technician in this field should be able to make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the attached claims.

Claims (20)

1. An antenna structure, the antenna structure comprising:

A metalworking member having a slot, wherein the metalworking member includes a first ground portion and a second ground portion, and the slot is interposed between the first ground portion and the second ground portion;

A grounding element;

a feed-in radiation part with a feed-in point;

a first radiation part coupled to the feed radiation part;

a second radiation portion coupled to the feed radiation portion, wherein the second radiation portion and the first radiation portion extend in opposite directions;

a parasitic radiating portion coupled to the ground element, wherein the parasitic radiating portion is adjacent to the first radiating portion and the second radiating portion;

an adjusting circuit coupled between the first grounding portion and the second grounding portion of the metalworking apparatus member; and

The non-conductor supporting element is used for bearing the grounding element, the feed-in radiation part, the first radiation part, the second radiation part, the parasitic radiation part and the adjusting circuit.

2. The antenna structure of claim 1, wherein the slot of the metalworking member presents an L-shape.

3. The antenna structure of claim 1, wherein the slot of the metalorganic member has a relatively wide open end and a relatively narrow closed end.

4. The antenna structure of claim 3, wherein the spacing between the tuning circuit and the closed end of the slot is between 3mm and 7 mm.

5. The antenna structure of claim 1, wherein the first radiating portion exhibits a zigzag shape.

6. The antenna structure of claim 1, wherein the first radiating portion further comprises an end widening.

7. The antenna structure of claim 1, wherein the second radiating portion presents an unequal width straight strip shape.

8. The antenna structure of claim 1, wherein the second radiating portion comprises a narrower portion and a wider portion, and the wider portion is coupled to the feed radiating portion via the narrower portion.

9. The antenna structure of claim 1, wherein the parasitic radiating portion exhibits an L-shape.

10. The antenna structure of claim 1, wherein the parasitic radiating portion further has a corner notch.

11. The antenna structure of claim 1, wherein a first coupling gap is formed between the parasitic radiating portion and the first radiating portion, a second coupling gap is formed between the parasitic radiating portion and the second radiating portion, and a width of each of the first coupling gap and the second coupling gap is between 0.8mm and 1.2 mm.

12. The antenna structure of claim 1, wherein the non-conductive support element has a first surface, a second surface, and a third surface, the first surface being interposed between the second surface and the third surface, and the second surface and the third surface being substantially perpendicular to the first surface.

13. The antenna structure of claim 12, wherein the first radiating portion and the parasitic radiating portion extend from the first surface to the second surface of the non-conductive support element.

14. The antenna structure of claim 12, wherein the second radiating portion is disposed on the first surface of the non-conductive support element, and the ground element is disposed on the third surface of the non-conductive support element.

15. The antenna structure of claim 1, wherein the antenna structure comprises a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band, the first frequency band is between 617MHz and 960MHz, the second frequency band is between 1710MHz and 2690MHz, the third frequency band is between 3300MHz and 5000MHz, and the fourth frequency band is between 5150MHz and 5925 MHz.

16. The antenna structure of claim 15, wherein the slot has a length approximately equal to 0.25 times the wavelength of the first frequency band.

17. The antenna structure of claim 15, wherein a total length of the feed radiation portion and the first radiation portion is approximately equal to 0.25 times the wavelength of the second frequency band.

18. The antenna structure of claim 15, wherein a total length of the feed radiation portion and the second radiation portion is approximately equal to 0.25 times the wavelength of the third frequency band.

19. The antenna structure of claim 15, wherein the length of the parasitic radiating portion is approximately equal to 0.25 times the wavelength of the second frequency band.

20. The antenna structure of claim 1, wherein the adjusting circuit comprises:

A first inductance element;

a second inductance element;

A capacitor element;

A circuit breaker element; and

The selection circuit selects one of the first inductance element, the second inductance element, the capacitance element and the breaking element as a target element according to a control signal, wherein the target element is coupled between the first grounding portion and the second grounding portion of the metal machine component.