CN114497992A - Antenna structure - Google Patents

Abstract

An antenna structure. The antenna structure includes: the antenna comprises a metal machine component, a grounding element, a feed-in radiation part and a dielectric substrate; the metal machine component is provided with a slotted hole, wherein the slotted hole is provided with a first closed end and a second closed end; the grounding element is coupled to the metal machine component; the feed-in radiation part is provided with a feed-in point, wherein the feed-in radiation part is coupled to the grounding element; the medium substrate is provided with a first surface and a second surface which are opposite, wherein the feed radiation part is arranged on the first surface of the medium substrate, and the second surface is adjacent to the metal machine component; the slot of the metal machine component is excited to generate a first frequency band and a second frequency band, and the feed-in radiation part is excited to generate a third frequency band. The antenna structure of the invention can be mutually integrated with the metal machine component of the mobile device, compared with the traditional design, the antenna structure of the invention has the advantages of small size, wide frequency band, low manufacturing cost, beautifying the appearance of the device and the like, so the antenna structure 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), in particular to a multi-band (Multi-band) antenna structure.

Background technique

With the development of mobile communication technology, mobile devices have become more and more common 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 range, for example: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and they use frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz to communicate, while some cover short-range wireless communication ranges, such as: Wi-Fi, Bluetooth systems use the 2.4GHz, 5.2GHz, and 5.8GHz frequency bands to communicate.

Antenna is an indispensable element in the field of wireless communication. If the bandwidth of the antenna used for receiving or transmitting signals is insufficient, the communication quality of the mobile device is easily degraded. Therefore, how to design small-sized, wide-band antenna elements 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 provides an antenna structure, comprising: a metal mechanism member, the metal mechanism member has a slot hole, wherein the slot hole has a first closed end and a second closed end; a ground element, the grounding element is coupled to the metal structure; a feeding and radiating part, the feeding and radiating part has a feeding point, wherein the feeding and radiating part is coupled to the grounding element; and a dielectric substrate, the dielectric The substrate has an opposite first surface and a second surface, wherein the feeding and radiating portion is disposed on the first surface, and the second surface is adjacent to the metal mechanism component; wherein the slot hole of the metal mechanism component is excited A first frequency band and a second frequency band are generated, and the feeding radiation portion is excited to generate a third frequency band.

In some embodiments, the first frequency band is between 2400MHz and 2500MHz, the second frequency band is between 5150MHz and 5850MHz, and the third frequency band is between 6000MHz and 7125MHz.

In some embodiments, the distance from the feeding point to the first closed end of the slot is between 0.25 times to 0.5 times the wavelength of the first frequency band.

In some embodiments, the distance from the feeding point to the second closed end of the slot is between 0.25 times to 0.5 times the wavelength of the second frequency band.

In some embodiments, the feeding and radiating portion is approximately in a T-shape.

In some embodiments, the feeding and radiating portion includes a first branch, a second branch, and a third branch, and the feeding point is located on the first branch.

In some embodiments, both the first branch and the third branch are coupled to the ground element through the second branch.

In some embodiments, the vertical projections of the first branch and the third branch on the metal mechanism component are both located inside the slot.

In some embodiments, the total length of the first branch and the second branch is between 0.25 times to 0.5 times the wavelength of the third frequency band.

In some embodiments, the width of the first branch is greater than the width of the third branch.

In some embodiments, the included angle between the second branch and the third branch is between 90 degrees and 180 degrees.

In some embodiments, the feeding and radiating portion is substantially M-shaped.

In some embodiments, the length of the feeding radiation portion is between 0.25 times to 0.5 times the wavelength of the third frequency band.

In some embodiments, the ground element further includes a first protruding portion and a second protruding portion.

In some embodiments, the first protruding portion of the grounding element is in the shape of a long strip.

In some embodiments, the second protruding portion of the grounding element presents an inverted T-shape.

In some embodiments, the feeding and radiating portion includes a first rectangular widening portion, a second rectangular widening portion, and a third rectangular widening portion, and the first rectangular widening portion is adjacent to the ground element of the first protruding portion.

In some embodiments, the vertical projections of the first rectangular widened portion, the second rectangular widened portion, and the third rectangular widened portion on the metal mechanism component are all located inside the slot hole.

In some embodiments, the antenna structure further includes: a circuit element, wherein the third rectangular widened portion is coupled to the second protruding portion of the ground element via the circuit element.

In some embodiments, the circuit element is a capacitor.

The antenna structure of the present invention can be integrated with the metal parts of the mobile device. Compared with the traditional design, the antenna structure of the present invention can achieve the advantages of small size, wide frequency band, low manufacturing cost, and beautifying the appearance of the device. It is very suitable for use in various mobile communication devices.

Description of drawings

FIG. 1 shows a top view of an antenna structure according to an embodiment of the present invention.

FIG. 2 shows a cross-sectional view of an antenna structure according to an embodiment of the present invention.

FIG. 3 shows a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the present invention.

FIG. 4 shows a radiation efficiency diagram of an antenna structure according to an embodiment of the present invention.

FIG. 5 shows a top view of an antenna structure according to an embodiment of the present invention.

FIG. 6 shows a cross-sectional view of an antenna structure according to an embodiment of the present invention.

Explanation of main component symbols:

100, 500 Antenna Structure

110, 510 Metal parts

120, 520 slotted hole

121, 521 The first closed end

122, 522 Second closed port

130, 530 grounding element

140, 540 feed into the radiation part

150 Feed into the first branch of the radiator

151 The first end of the first branch

152 Second end of the first branch

160 Feed into the second branch of the radiating part of the second branch

161 First End

162 Second end of second branch

170 Feed into the third branch of the radiator

171 The first end of the third branch

172 Second end of the third branch

180, 580 dielectric substrate

534 first protrusion of ground element

535 Second protrusion of ground element

541 Feed into the first end of the radiator

542 Feed into the second end of the radiator

544 Feed into the first rectangular widened part of the radiating part

545 Feed into the second rectangular widened part of the radiator

546 Feed into the third rectangular widened part of the radiator

550 Circuit Components

D1, D2, D3, D4, D5, D6, D7, D8 spacing

The first surface of the E1, E3 dielectric substrate

The second surface of the E2, E4 dielectric substrate

FB1 first band

FB2 Second Band

FB3 third band

FP1, FP2 feed point

GC1 coupling gap

Thickness of H1, H2 dielectric substrate

L1, L2, L3 length

LC1, LC2 hatching

W1, W2, W3, W4, W5, W6, W7 width

θ included angle

Detailed ways

In order to make the objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are exemplified below, and are described in detail as follows in conjunction with the accompanying drawings.

Certain terms are used in the specification and claims to refer to particular elements. It should be understood by those skilled in the art that hardware manufacturers may refer to the same element by different nouns. The description and claims do not use the difference in name as a way to distinguish elements, but use the difference in function of the elements as a criterion for distinguishing. The words "comprising" and "including" 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. Furthermore, the term "coupled" in this specification includes any direct and indirect means of electrical connection. Therefore, if a first device is described as being 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 through other devices or connecting means. Second device.

The following disclosure provides many different embodiments or examples for implementing 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 the specification describes that a first feature is formed on or over a second feature, it may include embodiments in which the first feature and the second feature are in direct contact, and may also include additional features. An embodiment 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 of the following description may reuse the same reference symbols and/or symbols. These repetitions are for the purpose of simplicity and clarity and are not intended to limit the particular relationship between the various embodiments and/or structures discussed.

In addition, spatially relative terms such as "below," "below," "lower," "above," "upper," and similar terms, are used to facilitate the description of an element or feature in an icon A relationship to another element or feature(s). These spatially relative terms are intended to encompass different orientations of the device in use or operation other than the orientation depicted in the figures. The device may be turned in different orientations (rotated 90 degrees or otherwise), and spatially relative terms used herein are to be interpreted in the same way.

FIG. 1 shows a top view of an antenna structure (Antenna Structure) 100 according to an embodiment of the present invention. FIG. 2 shows a cross-sectional view of the antenna structure 100 according to an embodiment of the present invention (according to a cross-sectional line LC1 in FIG. 1 ). Please refer to Figure 1 and Figure 2 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 embodiment shown in FIGS. 1 and 2 , the antenna structure 100 includes: a Metal Mechanism Element 110 , a Ground Element 130 , a Feeding Radiation Element 140 , and a dielectric substrate (Dielectric Substrate) 180, wherein the grounding element 130 and the feeding and radiating portion 140 can be made of metal materials, such as copper, silver, aluminum, iron, or alloys thereof.

The metal mechanism member 110 may be a metal casing of the mobile device. In some embodiments, the metal structure member 110 is a metal top cover of a notebook computer or a metal back cover of a tablet computer, but it is not limited thereto. For example, if the mobile device is a notebook computer, the metal mechanism component 110 may be commonly known as "A component" in the field of notebook computers. The metal mechanism member 110 has a slot hole 120 , wherein the slot hole 120 of the metal mechanism member 110 can be roughly in the shape of a straight bar. In detail, the slot 120 may have a first closed end 121 and a second closed end 122 that are away from each other. The antenna structure 100 may also include a non-conductive material, which is filled in the slot 120 of the metal structure member 110 to achieve waterproof or dustproof functions.

The dielectric substrate 180 may be an FR4 (Flame Retardant 4) substrate, a Printed Circuit Board (PCB), or a Flexible Printed Circuit (FPC). The dielectric substrate 180 has a vertical projection on the metal mechanism member 110 , and the vertical projection can completely cover the slot hole 120 of the metal mechanism member 110 . The dielectric substrate 180 has a first surface E1 and a second surface E2 opposite to each other, wherein the feeding and radiating portion 140 is disposed on the first surface E1 of the dielectric substrate 180 , and the second surface E2 of the dielectric substrate 180 is adjacent to the metal structure. Slot 120 of 110. It must be noted that the term "adjacent" or "adjacent" in this specification may mean that the distance between the corresponding two elements is less than a predetermined distance (for example: 5mm or less), and may also include the direct contact between the corresponding two elements. case (ie, the aforementioned pitch is shortened to 0). In some embodiments, the second surface E2 of the dielectric substrate 180 is directly attached to the metal mechanism component 110 .

The ground element 130 may be a ground copper foil, which may be coupled to the metal mechanism member 110 . In some embodiments, the ground element 130 extends from the metal structure member 110 to the first surface E1 of the dielectric substrate 180 .

The feeding and radiating portion 140 may be approximately in a T-shape, and its vertical projection may at least partially overlap with the slot 120 of the metal mechanism member 110 . The feeding and radiating portion 140 includes a first branch 150 , a second branch 160 , and a third branch 170 , wherein the first branch 150 and the third branch 170 both pass through the second branch 160 coupled to the ground element 130 . The first branch 150 may be substantially in the shape of a wider straight bar, and may be substantially parallel to the grounding element 130 . In detail, the first branch 150 has a first end 151 and a second end 152 , wherein a feeding point (Feeding Point) FP1 is located at the first end 151 of the first branch 150 . The feeding point FP1 can be coupled to a signal source (not shown). For example, the aforementioned signal source can be a radio frequency (RF) module, which can be used to excite the antenna structure 100 .

The second branch 160 can roughly represent a parallelogram or a rectangle. In detail, the second branch 160 has a first end 161 and a second end 162 , wherein the first end 161 of the second branch 160 is coupled to the ground element 130 , and the second end of the second branch 160 162 is coupled to the second end 152 of the first branch 150 . The third branch 170 may be substantially in the shape of a narrower straight bar (narrower than the first branch 150 ), and may be substantially parallel to the grounding element 130 . In detail, the third branch 170 has a first end 171 and a second end 172 , wherein the first end 171 of the third branch 170 is coupled to the second end 162 of the second branch 160 , and the third branch The second end 172 of the road 170 is an open end. The second end 172 of the third branch 170 and the first end 151 of the first branch 150 may extend substantially in opposite directions and away from each other. In some embodiments, an included angle θ between the second branch 160 and the third branch 170 is between 90 degrees and 180 degrees (eg, about 120 degrees). However, the present invention is not limited to this. In other embodiments, the aforementioned included angle θ can also be changed to be exactly equal to 90 degrees, so that the second branch 160 and the third branch 170 are perpendicular to each other. It must be noted that the vertical projections of the first branch 150 and the third branch 170 on the metal mechanism member 110 are both completely inside the slot 120 .

3 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. 3 , the antenna structure 100 can cover a first frequency band FB1 , a second frequency band FB2 , and a third frequency band FB3 . For example, the first frequency band FB1 may be between 2400MHz and 2500MHz, the second frequency band FB2 may be between 5150MHz and 5850MHz, and the third frequency band FB3 may be between 6000MHz and 7125MHz. Therefore, the antenna structure 100 can at least support the broadband operation of the traditional WLAN (Wireless Local Area Network) 2.4GHz/5GHz and the new generation Wi-Fi 6E.

In terms of antenna principle, the slot 120 of the metal structure member 110 can be coupled and excited by the feeding radiating portion 140 , thereby generating the aforementioned first frequency band FB1 and second frequency band FB2 . The first branch 150 and the second branch 160 feeding into the radiating portion 140 can also be co-excited to generate the aforementioned third frequency band FB3. On the other hand, the third branch 170 fed into the radiating portion 140 can be used to fine-tune the impedance matching of the aforementioned first frequency band FB1 , second frequency band FB2 , and third frequency band FB3 . According to the actual measurement results, if the vertical projections of the first branch 150 and the third branch 170 feeding the radiating portion 140 are completely designed inside the slot 120 , the operation bandwidth of the antenna structure 100 will be able to effectively increase.

4 shows a radiation efficiency (Radiation Efficiency) 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 radiation efficiency (%). According to the measurement results in FIG. 4 , the radiation efficiency of the antenna structure 100 in the aforementioned first frequency band FB1 , second frequency band FB2 , and third frequency band FB3 can all reach more than 25%, which can meet the practical application of general mobile communication devices need.

In some embodiments, the element dimensions of the antenna structure 100 may be as follows. The distance D1 from the feeding point FP1 to the first closed end 121 of the slot 120 may be between 0.25 times to 0.5 times the wavelength of the first frequency band FB1 of the antenna structure 100 (λ/4˜λ/2). The distance D2 from the feeding point FP1 to the second closed end 122 of the slot 120 may be between 0.25 times to 0.5 times the wavelength (λ/4˜λ/2) of the second frequency band FB2 of the antenna structure 100 . The width W1 of the slot 120 may be between 2 mm and 3 mm. The total length L1 of the first branch 150 and the second branch 160 may be between 0.25 times to 0.5 times the wavelength of the third frequency band FB3 of the antenna structure 100 (λ/4˜λ/2). The length L2 of the third branch 170 may be between 4 mm and 5 mm. The width W2 of the first branch 150 may be at least twice the width W3 of the third branch 170 . The distance D3 between the first branch 150 and the grounding element 130 may be between 1 mm and 1.5 mm. The distance D4 between the third branch 170 and the grounding element 130 may be between 1.5 mm and 2 mm. The thickness H1 of the dielectric substrate 180 may be about 0.2 mm. The above component size ranges are derived from multiple experimental results, which help to optimize the operating bandwidth and impedance matching of the antenna structure 100 .

FIG. 5 shows a top view of an antenna structure 500 according to an embodiment of the present invention. FIG. 6 shows a cross-sectional view of an antenna structure 500 according to an embodiment of the present invention (according to a cross-sectional line LC2 in FIG. 5 ). Please refer to Figure 5 and Figure 6 together. In the embodiments shown in FIGS. 5 and 6 , the antenna structure 500 includes: a metal structure member 510 , a grounding element 530 , a feeding and radiating portion 540 , and a dielectric substrate 580 , wherein the grounding element 530 and the feeding and radiating portion 540 All can be made of metal.

The metal mechanism member 510 may be a metal casing of the mobile device. In some embodiments, the metal structure member 510 is a metal top cover of a notebook computer, or a metal back cover of a tablet computer, but it is not limited thereto. The metal mechanism member 510 has a slot hole 520 , wherein the slot hole 520 of the metal mechanism member 510 can be roughly in the shape of a straight bar. In detail, the slotted hole 520 may have a first closed end 521 and a second closed end 522 that are away from each other. The antenna structure 500 may also include a non-conductive material, which is filled in the slot 520 of the metal structure member 510 to achieve waterproof or dustproof functions.

The dielectric substrate 580 may be an FR4 substrate, a printed circuit board, or a flexible circuit board. The dielectric substrate 580 has a vertical projection on the metal mechanism member 510 , and the vertical projection can completely cover the slot 520 of the metal mechanism member 510 . The dielectric substrate 580 has a first surface E3 and a second surface E4 opposite to each other, wherein the feeding and radiating portion 540 is disposed on the first surface E3 of the dielectric substrate 580 , and the second surface E4 of the dielectric substrate 580 is adjacent to the metal mechanism component Slot 520 of 510. In some embodiments, the second surface E4 of the dielectric substrate 580 is directly attached to the metal mechanism component 510 .

The ground element 530 may be a ground copper foil, which may be coupled to the metal mechanism member 510 . In some embodiments, the ground element 530 extends from the metal structure member 510 to the first surface E3 of the dielectric substrate 580 . Specifically, the grounding element 530 further includes a first protruding portion 534 and a second protruding portion 535 , both of which can be disposed on the first surface E3 of the dielectric substrate 580 . For example, the first protruding portion 534 of the grounding element 530 may be approximately in a long strip shape, and the second protruding portion 535 of the grounding element 530 may be approximately in an inverted T-shape.

The feeding and radiating portion 540 may substantially present an M-shape, and its vertical projection may at least partially overlap with the slot 520 of the metal mechanism member 510 . In detail, the feeding radiating portion 540 has a first end 541 and a second end 542 , wherein a feeding point FP2 is located at the first end 541 of the feeding radiating portion 540 . The feeding point FP2 can be coupled to a signal source. For example, the aforementioned signal source can be a radio frequency module, which can be used to excite the antenna structure 500 . In some embodiments, the feeding radiating portion 540 includes a first rectangular widening portion 544, a second rectangular widening portion 545, and a third rectangular widening portion 546, wherein the first rectangular widening portion 546 The wide portion 544 is adjacent to the first protruding portion 534 of the ground element 530 so that a coupling gap GC1 is formed therebetween. In addition, the third rectangular widened portion 546 is located at the second end 542 of the feed-radiating portion 540 , and the second rectangular widened portion 545 is interposed between the first rectangular widened portion 544 and the third rectangular widened portion 546 . It must be noted that the vertical projections of the first rectangular widened portion 544 , the second rectangular widened portion 545 , and the third rectangular widened portion 546 on the metal mechanism member 510 are all located completely inside the slot hole 520 . Also, the feeding point FP2 may be located between the first protruding portion 534 and the second protruding portion 535 of the ground element 530 .

In some embodiments, the antenna structure 500 further includes a circuit component 550 . The circuit element 550 can be a fixed capacitor, a fixed inductor, or a fixed resistor. Alternatively, the circuit element 550 can be a variable capacitor (Variable Capacitor), a variable inductor (Variable Inductor), or a variable resistor (Variable Resistor), the impedance value of which can be based on a processor (Processor) is adjusted by a control potential. The third rectangular widened portion 546 of the feed-in radiation portion 540 may also be coupled to the second protruding portion 535 of the ground element 530 via the circuit element 550 .

According to the actual measurement results, the antenna structure 500 can cover a first frequency band, a second frequency band, and a third frequency band. For example, the aforementioned first frequency band may be between 2400MHz and 2500MHz, the aforementioned second frequency band may be between 5150MHz and 5850MHz, and the aforementioned third frequency band may be between 6000MHz and 7125MHz. Therefore, the antenna structure 500 can at least support the broadband operation of the traditional WLAN 2.4GHz/5GHz and the new generation Wi-Fi 6E.

In terms of the antenna principle, the slot 520 of the metal mechanism member 510 can be coupled and excited by the feeding radiating portion 540, thereby generating the aforementioned first frequency band and second frequency band. The feed radiating portion 540 can also be excited to generate the aforementioned third frequency band. According to the actual measurement results, the addition of the first rectangular widening portion 544, the second rectangular widening portion 545, and the third rectangular widening portion 546 can be used to fine-tune the impedance of the aforementioned first frequency band, second frequency band, and third frequency band match. In addition, the addition of circuit elements 550 helps to miniaturize the overall size of the antenna structure 500 .

In some embodiments, the element dimensions of the antenna structure 500 may be as follows. The distance D5 from the feeding point FP2 to the first closed end 521 of the slot 520 may be between 0.25 times to 0.5 times the wavelength of the first frequency band of the antenna structure 500 (λ/4˜λ/2). The distance D6 from the feeding point FP2 to the second closed end 522 of the slot 520 may be between 0.25 times to 0.5 times the wavelength of the second frequency band of the antenna structure 500 (λ/4˜λ/2). The width W4 of the slot 520 may be between 2 mm and 3 mm. The length L3 of the feeding radiation portion 540 may be between 0.25 times to 0.5 times the wavelength of the third frequency band of the antenna structure 500 (λ/4˜λ/2). The width W5 of the first rectangular widened portion 544 may be greater than the width W6 of the second rectangular widened portion 545 , and the width W6 of the second rectangular widened portion 545 may be greater than the width W7 of the third rectangular widened portion 546 . For example, the aforementioned width W5 may be between 5 mm and 7 mm, the aforementioned width W6 may be between 3 mm and 5 mm, and the aforementioned width W7 may be between 2 mm and 3 mm. The distance D7 between the first rectangular widening portion 544 and the second rectangular widening portion 545 may be between 1 mm and 2 mm. The distance D8 between the second rectangular widening portion 545 and the third rectangular widening portion 546 may be between 3 mm and 4 mm. The width of the coupling gap GC1 may be less than 0.5 mm. The circuit element 550 can be a capacitor, and its capacitance can be between 0.1pF and 2pF, for example, about 0.9pF. The thickness H2 of the dielectric substrate 580 may be about 0.2 mm. The above component size ranges are derived from multiple experimental results, which help to optimize the operating bandwidth and impedance matching of the antenna structure 500 .

The present invention proposes a novel antenna structure that can be integrated with a metal mechanism component of a mobile device. Compared with the traditional design, the antenna structure of the present invention can have the advantages of small size, wide frequency band, low manufacturing cost, and beautify the appearance of the device, so it is very suitable for application in various mobile communication devices.

It should be noted that the above-mentioned element size, element shape, element parameter, and frequency range are not limitations 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 FIGS. 1-6. The present invention may include only any one or more features of any one or more of the embodiments of Figures 1-6. In other words, not all of the illustrated features must be simultaneously implemented in the antenna structure of the present invention.

The ordinal numbers in this specification and the claims, such as "first", "second", "third", etc., do not have a sequential relationship with each other, and are only used to indicate and distinguish two identical different elements of the name.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art should be able to make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (20)

1. An antenna structure, comprising:

a metal machine component having a slot, wherein the slot has a first closed end and a second closed end;

a grounding element coupled to the metal machine component;

a feed-in radiation part, which has a feed-in point, wherein the feed-in radiation part is coupled to the grounding element; and

a dielectric substrate having a first surface and a second surface opposite to the first surface, wherein the feed radiation portion is disposed on the first surface, and the second surface is adjacent to the metal machine component;

wherein the slot of the metal machine component is excited to generate a first frequency band and a second frequency band, and the feed-in radiation part is excited to generate a third frequency band.

2. The antenna structure of claim 1 wherein the first frequency band is between 2400MHz and 2500MHz, the second frequency band is between 5150MHz and 5850MHz, and the third frequency band is between 6000MHz and 7125 MHz.

3. The antenna structure of claim 1 wherein the distance from the feed point to the first closed end of the slot is between 0.25 and 0.5 wavelengths of the first frequency band.

4. The antenna structure of claim 1, wherein a distance from the feeding point to the second closed end of the slot is between 0.25 and 0.5 wavelengths of the second frequency band.

5. The antenna structure according to claim 1, wherein the feeding radiating portion substantially presents a T-shape.

6. The antenna structure of claim 1, wherein the feeding radiating portion includes a first branch, a second branch, and a third branch, and the feeding point is located on the first branch.

7. The antenna structure of claim 6, wherein the first branch and the third branch are both coupled to the ground element via the second branch.

8. The antenna structure according to claim 6, wherein the vertical projections of the first branch and the third branch on the metal mechanism are located inside the slot.

9. The antenna structure of claim 6, wherein the total length of the first branch and the second branch is between 0.25 times and 0.5 times the wavelength of the third frequency band.

10. The antenna structure of claim 6 wherein the width of the first branch is greater than the width of the third branch.

11. The antenna structure of claim 6 wherein the angle between the second branch and the third branch is between 90 degrees and 180 degrees.

12. The antenna structure of claim 1, wherein the feeding radiating portion substantially has an M-shape.

13. The antenna structure of claim 1, wherein the length of the feeding radiating portion is between 0.25 and 0.5 wavelengths of the third frequency band.

14. The antenna structure of claim 1 wherein the ground element further comprises a first protruding portion and a second protruding portion.

15. The antenna structure of claim 14, wherein the first protruding portion of the ground element has a long strip shape.

16. The antenna structure of claim 14 wherein the second protruding portion of the ground element exhibits an inverted T-shape.

17. The antenna structure of claim 14, wherein the feeding radiating portion includes a first rectangular widened portion, a second rectangular widened portion, and a third rectangular widened portion, and the first rectangular widened portion is adjacent to the first protruding portion of the ground element.

18. The antenna structure of claim 17, wherein the vertical projections of the first rectangular widening section, the second rectangular widening section and the third rectangular widening section on the metal mechanism are all located inside the slot.

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

a circuit element, wherein the third rectangular widening is coupled to the second protruding portion of the ground element via the circuit element.

20. The antenna structure of claim 19 wherein the circuit element is a capacitor.

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