CN114188702A

CN114188702A - Antenna structure

Info

Publication number: CN114188702A
Application number: CN202010960684.5A
Authority: CN
Inventors: 赖国仁; 古光原; 李炯宏
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2020-09-14
Filing date: 2020-09-14
Publication date: 2022-03-15

Abstract

An antenna structure. The antenna structure includes: a metal machine component, a medium substrate, a feed-in radiation part and a coupling radiation part; 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 dielectric substrate is provided with a first surface and a second surface which are opposite; the feed-in radiation part is coupled to a signal source and is arranged on the second surface of the medium substrate, wherein the feed-in radiation part has a first vertical projection on the metal machine component; the coupling radiation part is coupled to a grounding potential and is arranged on the first surface of the medium substrate, wherein the coupling radiation part is provided with a second vertical projection on the metal machine component; wherein the second vertical projection of the coupling radiation part at least partially overlaps the first vertical projection of the feed radiation part. The antenna structure of the invention has the advantages of small size, wide frequency band, low manufacturing cost, adaptability to different environments 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), and more particularly, to a Multi-band Antenna Structure.

Background

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. To meet the demand of people, mobile devices generally have a function of wireless communication. Some cover long-range wireless communication ranges, such as: the mobile phone uses 2G, 3G, LTE (Long Term Evolution) system and its used frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz and 2500MHz for communication, while some cover short-distance wireless communication ranges, for example: Wi-Fi, Bluetooth (Bluetooth) systems use frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz for communication.

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

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

Disclosure of Invention

In a preferred embodiment, the present invention provides an antenna structure, including: a metal machine component having a slot, wherein the slot has a first closed end and a second closed end; the dielectric substrate is provided with a first surface and a second surface which are opposite; a feed-in radiation part, coupled to a signal source, disposed on the second surface of the dielectric substrate, wherein the feed-in radiation part has a first vertical projection on the metal machine component; and a coupling radiation part, coupled to a ground potential, disposed on the first surface of the dielectric substrate, wherein the coupling radiation part has a second vertical projection on the metal machine component; wherein the second vertical projection of the coupling radiation part is at least partially overlapped with the first vertical projection of the feeding radiation part.

In some embodiments, the antenna structure can cover a first frequency band between 2400MHz and 2495MHz, a second frequency band between 5170MHz and 5835MHz, and a third frequency band between 5925MHz and 7125 MHz.

In some embodiments, the length of the slot is between 1/4 and 1/2 wavelengths of the first frequency band.

In some embodiments, the first vertical projection of the feeding radiation part is completely located inside the slot.

In some embodiments, the feeding radiating part is in a straight strip shape.

In some embodiments, the feeding radiating portion has a first end and a second end, the first end of the feeding radiating portion is adjacent to the coupling radiating portion, and a feeding point coupled to the signal source is located between the first end and the second end of the feeding radiating portion.

In some embodiments, the antenna structure further comprises: a conductive through-element penetrating the dielectric substrate, wherein the feed-in point of the feed-in radiation part is coupled to the signal source via the conductive through-element.

In some embodiments, a distance from the feeding point to the first end of the feeding radiating element is between 1/4 and 1/3 wavelengths of the second frequency band.

In some embodiments, a distance from the feed point to the first closed end or the second closed end of the slot is between 1/3 times and 1/2 times a length of the slot.

In some embodiments, the second perpendicular projection of the coupling radiation part is at least partially located inside the slot.

In some embodiments, the coupling radiation portion has an L-shape or a T-shape.

In some embodiments, a notch is formed at a corner of the coupling radiation portion.

In some embodiments, the coupling radiation portion has a first end and a second end, a grounding point coupled to the ground potential is located at the first end of the coupling radiation portion, and the second end of the coupling radiation portion is an open end.

In some embodiments, the length of the coupling radiation portion is less than or equal to 1/2 wavelengths of the third frequency band.

In some embodiments, the antenna structure further comprises: a first parasitic radiation portion coupled to the ground potential and disposed on the first surface of the dielectric substrate.

In some embodiments, the first parasitic radiation portion exhibits a widened L-shape.

In some embodiments, a distance from the first parasitic radiating portion to the coupling radiating portion is greater than or equal to 3 mm.

In some embodiments, the antenna structure further comprises: and a second parasitic radiation part coupled to the ground potential and arranged on the first surface of the dielectric substrate.

In some embodiments, the second parasitic radiation portion has an inverted L-shape.

In some embodiments, the distance from the second parasitic radiation part to the feed radiation part is greater than or equal to 3 mm.

The present invention provides a novel antenna structure, which can be integrated with a metal mechanism of a 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, adaptation to different environments and the like, so the antenna structure is very suitable for being applied to various mobile communication devices.

Drawings

Fig. 1A is a perspective view of an antenna structure according to an embodiment of the invention.

Fig. 1B is a top view of a metal machine component of an antenna structure according to an embodiment of the invention.

Fig. 1C is a top view of a portion of the antenna structure on the first surface of the dielectric substrate according to an embodiment of the invention.

Fig. 1D shows a perspective view of another part of the elements of the antenna structure on the second surface of the dielectric substrate according to an embodiment of the invention.

Fig. 1E shows a cross-sectional view of an antenna structure according to an embodiment of the invention.

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

Fig. 3 shows a voltage standing wave ratio diagram of the antenna structure when the grounding point is removed from the coupling radiation portion.

Fig. 4A is a perspective view of an antenna structure according to an embodiment of the invention.

Fig. 4B is a top view of a metal machine component of an antenna structure according to an embodiment of the invention.

Fig. 4C is a top view of a portion of the antenna structure on the first surface of the dielectric substrate according to an embodiment of the invention.

Fig. 4D shows a perspective view of another part of the elements of the antenna structure on the second surface of the dielectric substrate according to an embodiment of the invention.

Fig. 4E is a cross-sectional view of an antenna structure according to an embodiment of the invention.

Fig. 5 is a voltage standing wave ratio diagram of an antenna structure according to an embodiment of the invention.

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

Description of the main component symbols:

100. 400 antenna structure

110. 410 metal machine component

115. 415 support element

120. 420 slotted hole

121. 421 first closed end

122. 422 second closed end

130. 430 feed radiation part

131. 431 feed into the first end of the radiating part

132. 432 to the second end of the radiating part

140. 440 coupled radiation part

141. 441 is coupled to a first end of the radiating portion

142. 442 coupled to the second end of the radiating part

150. 450 conductive feedthrough

180. 480 medium substrate

190. 490 signal source

443 a third end coupled with the radiation part

445 notch of coupling radiation part

460 first parasitic radiation part

461 first end of the first parasitic radiation part

462 second end of the first parasitic radiation part

470 second parasitic radiation part

471 a first end of the second parasitic radiation part

472 second end of the second parasitic radiating portion

CP connection point

D1, D2, D3, D4, D5 and D6 pitches

DA. DB overlap distance

E1, E3 first surface

E2, E4 second surface

FB1, FB4 first frequency band

FB2, FB5 second frequency band

FB3 and FB6 third frequency band

FP1, FP2 feed point

GP1, GP2 ground point

H1, H2 thickness

L1, L2, L3, L4 Length

LC1 and LC2 section lines

VSS ground potential

Detailed Description

In order to make the objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below.

Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The term "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to achieve the basic technical result. In addition, the term "coupled" is used herein to encompass any direct or indirect electrical connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.

Fig. 1A shows a perspective view of an Antenna Structure (Antenna Structure)100 according to an embodiment of the invention. The antenna structure 100 may be used in a Mobile Device (Mobile Device), such as: a Smart Phone (Smart Phone), a Tablet Computer (Tablet Computer), or a Notebook Computer (Notebook Computer). As shown in fig. 1A, the antenna structure 100 includes at least: a Metal mechanical Element (Metal mechanical Element)110, a Feeding Radiation Element (Feeding Radiation Element)130, a Coupling Radiation Element (Coupling Radiation Element)140, and a Dielectric Substrate (Dielectric Substrate)180, wherein the Feeding Radiation Element 130 and the Coupling Radiation Element 140 can be made of Metal materials, such as: copper, silver, aluminum, iron, or alloys thereof.

The metal machine component 110 may be a metal housing of the mobile device. In some embodiments, the metal machine component 110 is a metal top cover of a notebook computer or a metal back cover of a tablet computer, but is not limited thereto. For example, if the mobile device is a notebook computer, the metal machine component 110 can be commonly referred to as "part A" in the notebook computer art. The metal machine component 110 has a slot 120, wherein the slot 120 of the metal machine component 110 may be substantially in the shape of a straight strip. In detail, the slot 120 may have a first Closed End (Closed End)121 and a second Closed End 122 that are far away from each other. The antenna structure 100 may also include a non-conductive material filled in the slot 120 of the metal machine member 110 to achieve the waterproof or dustproof function.

The dielectric substrate 180 may be an FR4 (film resistor 4) substrate, a Printed Circuit Board (PCB), or a Flexible Printed Circuit (FPC). The dielectric substrate 180 has a Vertical Projection (Vertical Projection) on the metal machine component 110, and the Vertical Projection of the substrate can completely cover the slot 120 of the metal machine component 110. The dielectric substrate 180 has a first surface E1 and a second surface E2 opposite to each other, wherein the second surface E2 of the dielectric substrate 180 is adjacent to the slot 120 of the metal mechanical component 110. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a distance between two corresponding elements that is less than a predetermined distance (e.g., 5mm or less), but generally does not include a case where two corresponding elements are in direct contact with each other (i.e., the distance is reduced to 0). The coupling radiation part 140 may be disposed on the first surface E1 of the dielectric substrate 180, and the feeding radiation part 130 may be disposed on the second surface E2 of the dielectric substrate 180; alternatively, the coupling radiation part 140 may be disposed on the second surface E2 of the dielectric substrate 180, and the feeding radiation part 130 may be disposed on the first surface E1 of the dielectric substrate 180, neither design affecting the efficacy of the present invention. In some embodiments, the antenna structure 100 further includes a Support Element (Support Element)115, which may be made of non-conductive material, such as: and (3) plastic materials. The supporting component 115 can be disposed on the metal machine member 110 and is used to support and fix the dielectric substrate 180 and all components thereon. The supporting element 115 may be used to prevent the feeding radiating part 130 from directly contacting the metal machine member 110. It should be understood that the supporting Element 115 is only an Optional Element (Optional Element), and may be removed in other embodiments. Fig. 1B is a top view of a metal machine component 110 of the antenna structure 100 according to an embodiment of the invention. Fig. 1C shows a top view of a part of the elements of the antenna structure 100 on the first surface E1 of the dielectric substrate 180 according to an embodiment of the present invention. Fig. 1D shows a perspective view of another part of the elements of the antenna structure 100 on the second surface E2 of the dielectric substrate 180 according to an embodiment of the invention (i.e., the dielectric substrate 180 is regarded as a transparent element). Fig. 1E shows a cross-sectional view (along a section line LC1) of the antenna structure 100 according to an embodiment of the invention. Please refer to fig. 1A, fig. 1B, fig. 1C, fig. 1D, and fig. 1E together to understand the present invention.

The feeding radiating part 130 may be substantially in the shape of a straight bar. A Feeding Point (FP 1) of the Feeding radiating portion 130 can be coupled to a Signal Source (Signal Source) 190. For example, the signal source 190 may be a Radio Frequency (RF) module, which may be used to excite the antenna structure 100. In detail, the feeding radiating portion 130 has a first End 131 and a second End 132, which are two Open ends (Open ends) far away from each other, and the first End 131 of the feeding radiating portion 130 is adjacent to the coupling radiating portion 140. In addition, the feed point FP1 may be located between the first end 131 and the second end 132 of the feed radiating part 130 and relatively closer to the second end 132 of the feed radiating part 130. The feeding radiation part 130 has a first vertical projection on the metal machine component 110, and the first vertical projection can be completely located inside the slot 120 of the metal machine component 110.

In some embodiments, the antenna structure 100 further includes a Conductive Via Element (Conductive Via Element)150 that can penetrate the dielectric substrate 180 and is connected between the first surface E1 and the second surface E2. The feed point FP1 of the feed radiating portion 130 can be further coupled to the signal source 190 through the conductive through-via 150. However, the present invention is not limited thereto. In other embodiments, the conductive through via 150 may be omitted, such that the feed point FP1 of the feed radiating portion 130 is directly coupled to the signal source 190. In some embodiments, the signal source 190 uses a Coaxial Cable (not shown) to excite the feeding radiating portion 130.

The coupling radiation portion 140 may substantially have an L-shape with an equal width. In detail, the coupling radiation portion 140 has a first End 141 and a second End 142, wherein a ground Point (Grounding Point) GP1 coupled to a ground potential VSS is located at the first End 141 of the coupling radiation portion 140, and the second End 142 of the coupling radiation portion 140 is an Open End (Open End). For example, the Ground potential VSS may be provided by a Ground Copper Foil (not shown), which may be further coupled to the metal machine component 110. The coupling radiation part 140 has a second vertical projection on the metal machine component 110, and the second vertical projection can be at least partially located inside the slot 120 of the metal machine component 110. In addition, the second vertical projection of the coupling radiation part 140 at least partially overlaps the first vertical projection of the feeding radiation part 130. Therefore, a Coupling Gap (Coupling Gap) is formed between the second end 142 of the Coupling radiation part 140 and the first end 131 of the feeding radiation part 130.

Fig. 2 shows a Voltage Standing Wave Ratio (VSWR) diagram of the antenna structure 100 according to an embodiment of the invention, wherein the horizontal axis represents operating frequency (MHz) and the vertical axis represents the VSWR. According to the measurement results shown in fig. 2, the antenna structure 100 covers a first frequency band FB1, a second frequency band FB2, and a third frequency band FB 3. For example, the first frequency band FB1 may be between 2400MHz and 2495MHz, the second frequency band FB2 may be between 5170MHz and 5835MHz, and the third frequency band FB3 may be between 5925MHz and 7125 MHz. Thus, the antenna structure 100 can support at least broadband operation of new generation Wi-Fi 6E.

In terms of antenna principles, an equivalent capacitor may be formed between the first end 131 of the feeding radiating part 130 and the second end 142 of the coupling radiating part 140, so that the feeding radiating part 130 and the coupling radiating part 140 may be almost collectively regarded as a Loop Structure (Loop Structure). In addition, the slot 120 of the metal machine component 110 can be excited by the aforementioned cyclic structure to completely cover the wide band operation of the first frequency band FB1, the second frequency band FB2, and the third frequency band FB 3.

Fig. 3 shows the voltage standing wave ratio of the antenna structure 100 if the grounding point GP1 is removed from the coupling radiation portion 140. As can be seen from comparing fig. 2 and fig. 3, the ungrounded coupling radiation portion 140 cannot make the antenna structure 100 cover the second frequency band FB2 and the third frequency band FB 3. Therefore, the coupling radiating portion 140 with the grounding point GP1 of the present invention can greatly increase the operating Bandwidth (Operation Bandwidth) of the antenna structure 100.

In some embodiments, the element dimensions of the antenna structure 100 may be as follows. The length L1 of the slot 120 of the antenna element 110 (i.e., the length L1 from the first closed end 121 to the second closed end 122) may be between 1/4 and 1/2 wavelengths (λ/4- λ/2) of the first frequency band FB1 of the antenna structure 100. The distance D1 from the feed point FP1 to the first end 131 of the feed radiating element 130 may be between 1/4 and 1/8 wavelengths (λ/4- λ/8) of the second frequency band FB2 of the antenna structure 100. The distance D2 from the feed point FP1 to the first closed end 121 of the slot 120 may be between 1/3 and 1/2 times the length L1 of the slot 120. The length L2 of the coupling radiation part 140 (i.e., the length L2 from the first end 141 to the second end 142) may be less than or equal to 1/2 times the wavelength (λ/2) of the third frequency band FB3 of the antenna structure 100. The thickness H1 of the dielectric substrate 180 (i.e., the distance between the first surface E1 and the second surface E2) may be between 0.2mm and 1.6 mm. The overlap distance DA between the first end 131 of the feeding radiating part 130 and the second end 142 of the coupling radiating part 140 may be greater than or equal to 1 mm. The above range of device sizes is derived from a number of experimental results, which help to optimize the operating bandwidth and Impedance Matching (Impedance Matching) of the antenna structure 100.

Fig. 4A is a perspective view of an antenna structure 400 according to an embodiment of the invention. In the embodiment of fig. 4A, the antenna structure 400 includes: a metal machine component 410, a feeding Radiation part 430, a coupling Radiation part 440, a conductive through-component 450, a first Parasitic Radiation part 460, a second Parasitic Radiation part 470, and a dielectric substrate 480, wherein the feeding Radiation part 430, the coupling Radiation part 440, the first Parasitic Radiation part 460, and the second Parasitic Radiation part 470 are all made of metal material.

The metal machine component 410 has a slot 420, wherein the slot 420 of the metal machine component 410 may be substantially in the shape of a straight strip. In detail, the slot 420 may have a first closed end 421 and a second closed end 422 that are far away from each other. The antenna structure 400 may also include a non-conductive material filled in the slot 420 of the metal machine component 410 to achieve waterproof or dustproof function.

The dielectric substrate 480 may be an FR4 substrate, a printed circuit board, or a flexible circuit board. The dielectric substrate 480 has a first surface E3 and a second surface E4 opposite to each other, wherein the second surface E4 of the dielectric substrate 480 is adjacent to the slot 420 of the metal mechanical component 410. The coupling radiation part 440, the first parasitic radiation part 460, and the second parasitic radiation part 470 may be disposed on the first surface E3 of the dielectric substrate 480, and the feeding radiation part 430 may be disposed on the second surface E4 of the dielectric substrate 480; alternatively, the coupling radiation part 440, the first parasitic radiation part 460, and the second parasitic radiation part 470 may be disposed on the second surface E4 of the dielectric substrate 480, and the feeding radiation part 430 may be disposed on the first surface E3 of the dielectric substrate 480. In some embodiments, the antenna structure 400 further includes a support element 415, which may be made of a non-conductive material. The supporting element 415 may be disposed on the metal machine component 410 and is used to support and fix the dielectric substrate 480 and all components thereon. Fig. 4B is a top view of a metal machine component 410 of the antenna structure 400 according to an embodiment of the invention. Fig. 4C is a top view of a part of the elements of the antenna structure 400 on the first surface E3 of the dielectric substrate 480 according to an embodiment of the present invention. Fig. 4D shows a perspective view of another part of the elements of the antenna structure 400 on the second surface E4 of the dielectric substrate 480 according to an embodiment of the invention (i.e., the dielectric substrate 480 is regarded as a transparent element). Fig. 4E shows a cross-sectional view (along a section line LC2) of the antenna structure 400 according to an embodiment of the invention. Please refer to fig. 4A, fig. 4B, fig. 4C, fig. 4D, and fig. 4E together to understand the present invention.

The feeding radiating part 430 may substantially have a straight bar shape. A feed point FP2 of the feed radiating portion 430 can be coupled to a signal source 490. For example, the signal source 490 may be a radio frequency module that may be used to excite the antenna structure 400. In detail, the feeding radiating portion 430 has a first end 431 and a second end 432, which are two open ends far away from each other, and the first end 431 of the feeding radiating portion 430 is adjacent to the coupling radiating portion 440. In addition, the feed point FP2 may be located between the first end 431 and the second end 432 of the feed radiating part 430 and relatively closer to the second end 432 of the feed radiating part 430. The feeding radiating part 430 has a first vertical projection on the metal machine component 410, and the first vertical projection can be completely located inside the slot 420 of the metal machine component 410. In some embodiments, the conductive through via 450 may penetrate the dielectric substrate 480 and be connected between the first surface E3 and the second surface E4, so that the feed point FP2 of the feeding radiating portion 430 may be further coupled to the signal source 490 through the conductive through via 450.

The coupling radiating section 440 may generally take the shape of a widened T. In detail, the coupling radiation portion 440 has a first end 441, a second end 442, and a third end 443, wherein a grounding point GP2 coupled to the ground potential VSS is located at the first end 441 of the coupling radiation portion 440, and the second end 442 and the third end 443 of the coupling radiation portion 440 are two open ends far away from each other. In some embodiments, a rectangular Notch (Notch)445 is formed at a corner of the coupling radiating portion 440, which is adjacent to the second end 442 of the coupling radiating portion 440. The coupling radiation portion 440 has a second vertical projection on the metal machine component 410, and the second vertical projection can be at least partially located inside the slot 420 of the metal machine component 410. In addition, the second vertical projection of the coupling radiation part 440 at least partially overlaps the first vertical projection of the feeding radiation part 430. Therefore, a coupling gap is formed between the second end 442 of the coupling radiation part 440 and the first end 431 of the feeding radiation part 430.

The first parasitic radiation portion 460 may substantially exhibit a widened L-shape. In detail, the first parasitic radiation portion 460 has a first end 461 and a second end 462, wherein the first end 461 of the first parasitic radiation portion 460 is coupled to the ground potential VSS, and the second end 462 of the first parasitic radiation portion 460 is an open end and extends toward the direction close to the coupling radiation portion 440. The first parasitic radiation part 460 has a third vertical projection on the metal machine component 410, and the third vertical projection can be at least partially located inside the slot 420 of the metal machine component 410.

The second parasitic radiation section 470 may substantially have an inverted L-shape. In detail, the second parasitic radiation portion 470 has a first end 471 and a second end 472, wherein the first end 471 of the second parasitic radiation portion 470 is an open end and extends toward the direction close to the feeding radiation portion 430, the second end 472 of the second parasitic radiation portion 470 is an open end, and a connection point CP coupled to the ground potential VSS is located between the first end 471 and the second end 472 of the second parasitic radiation portion 470. The second parasitic radiation portion 470 has a fourth vertical projection on the metal machine component 410, and the fourth vertical projection can be at least partially located inside the slot 420 of the metal machine component 410.

Fig. 5 shows a voltage standing wave ratio diagram of an antenna structure 400 according to an embodiment of the invention, wherein the horizontal axis represents operating frequency (MHz) and the vertical axis represents voltage standing wave ratio. According to the measurement results shown in fig. 5, the antenna structure 400 covers a first frequency band FB4, a second frequency band FB5, and a third frequency band FB 6. For example, the first frequency band FB4 may be between 2400MHz and 2495MHz, the second frequency band FB5 may be between 5170MHz and 5835MHz, and the third frequency band FB6 may be between 5925MHz and 7125 MHz. Thus, the antenna structure 400 may support at least broadband operation of new generation Wi-Fi 6E.

Fig. 6 shows a Radiation Efficiency (Radiation Efficiency) diagram of the antenna structure 400 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 shown in fig. 6, the radiation efficiency of the antenna structure 400 in the first frequency band FB4, the second frequency band FB5 and the third frequency band FB6 can reach 20% or higher, which can meet the practical application requirements of the conventional mobile communication device.

In terms of antenna principles, an equivalent capacitor may be formed between the first end 431 of the feeding radiating portion 430 and the second end 442 of the coupling radiating portion 440, so that the feeding radiating portion 430 and the coupling radiating portion 440 may be almost collectively regarded as a circular structure. The slot 420 of the metal machine component 410 can be excited by the aforementioned cyclic structure to completely cover the wide band operation of the first frequency band FB4, the second frequency band FB5, and the third frequency band FB 6. The addition of the first and second

parasitic radiation sections

460 and 470 can finely adjust the impedance matching of the first, second, and third frequency bands FB4, FB5, and FB6 according to the actual measurement result. Thus, the antenna structure 400 can be used in a variety of different environments of communication devices while maintaining good radiation performance.

In some embodiments, the element dimensions of the antenna structure 400 may be as follows. The length L3 of the slot 420 of the metal machine component 410 (i.e., the length L3 from the first closed end 421 to the second closed end 422) may be between 1/4 and 1/2 wavelengths (λ/4- λ/2) of the first frequency band FB4 of the antenna structure 400. The distance D3 from the feed point FP2 to the first end 431 of the feed radiating element 430 may be between 1/4 and 1/8 wavelengths (λ/4- λ/8) of the second frequency band FB5 of the antenna structure 400. The distance D4 from the feed point FP2 to the second closed end 422 of the slot 420 may be between 1/3 and 1/2 times the length L3 of the slot 420. The length L4 of the coupling radiation section 440 (i.e., the length L4 from the first end 441 to the second end 442) may be less than or equal to 1/2 wavelengths (λ/2) of the third frequency band FB6 of the antenna structure 400. The thickness H2 of the dielectric substrate 480 (i.e., the distance between the first surface E3 and the second surface E4) may be between 0.2mm and 1.6 mm. An overlap distance DB between the first end 431 of the feeding radiating part 430 and the second end 442 of the coupling radiating part 440 may be greater than or equal to 1 mm. The distance D5 from the second end 462 of the first parasitic radiation portion 460 to the third end 443 of the coupled radiation portion 440 may be greater than or equal to 3 mm. A distance D6 from the first end 471 of the second parasitic radiation part 470 to the second end 432 of the feeding radiation part 430 may be greater than or equal to 3 mm. The above ranges of device dimensions are derived from a number of experimental results, which help to optimize the operating bandwidth and impedance matching of the antenna structure 400.

It is noted that the sizes, shapes, parameters and frequency ranges of the above-mentioned components are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The antenna structure of the present invention is not limited to the states illustrated in fig. 1A to 6. The present invention may include only any one or more features of any one or more of the embodiments of fig. 1A-6. In other words, not all illustrated features may be implemented in the antenna structure of the present invention at the same time.

Ordinal numbers such as "first," "second," "third," etc., in the specification and claims are not to be given a sequential order, but are merely used to identify two different elements having the same name.

The present invention is not limited to the above embodiments, but rather, various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is to be determined by the appended claims.

Claims

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;

the dielectric substrate is provided with a first surface and a second surface which are opposite;

a feed-in radiation part, coupled to a signal source, disposed on the second surface of the dielectric substrate, wherein the feed-in radiation part has a first vertical projection on the metal machine component; and

a coupling radiation part, coupled to a ground potential and disposed on the first surface of the dielectric substrate, wherein the coupling radiation part has a second vertical projection on the metal machine component;

wherein the second vertical projection of the coupling radiation part is at least partially overlapped with the first vertical projection of the feeding radiation part.

2. The antenna structure of claim 1, wherein the antenna structure covers a first frequency band between 2400MHz and 2495MHz, a second frequency band between 5170MHz and 5835MHz, and a third frequency band between 5925MHz and 7125 MHz.

3. The antenna structure of claim 1 wherein the length of the slot is between 1/4 and 1/2 wavelengths of the first frequency band.

4. The antenna structure according to claim 1, wherein the first vertical projection of the feeding radiating part is located completely inside the slot.

5. The antenna structure according to claim 1, wherein the feeding radiating portion has a straight strip shape.

6. The antenna structure of claim 2, wherein the feeding radiating portion has a first end and a second end, the first end of the feeding radiating portion is adjacent to the coupling radiating portion, and a feeding point coupled to the signal source is located between the first end and the second end of the feeding radiating portion.

7. The antenna structure of claim 6, further comprising:

and the conductive through element penetrates through the medium substrate, and the feed-in point of the feed-in radiation part is coupled to the signal source through the conductive through element.

8. The antenna structure of claim 6, wherein a distance from the feeding point to the first end of the feeding radiating element is between 1/4 and 1/8 wavelengths of the second frequency band.

9. The antenna structure of claim 6 wherein a distance from the feed point to the first closed end or the second closed end of the slot is between 1/3 and 1/2 times a length of the slot.

10. The antenna structure of claim 1, wherein the second perpendicular projection of the coupling radiating section is at least partially located inside the slot.

11. The antenna structure of claim 1, wherein the coupling radiation portion has an L-shape or a T-shape.

12. The antenna structure of claim 1, wherein a notch is formed at a corner of the coupling radiating portion.

13. The antenna structure of claim 2, wherein the coupling radiation portion has a first end and a second end, a grounding point coupled to the ground potential is located at the first end of the coupling radiation portion, and the second end of the coupling radiation portion is an open end.

14. The antenna structure of claim 2, wherein the length of the coupling radiating portion is less than or equal to 1/2 wavelengths of the third frequency band.

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

a first parasitic radiation portion coupled to the ground potential and disposed on the first surface of the dielectric substrate.

16. The antenna structure of claim 15 wherein the first parasitic radiating portion exhibits a widened L-shape.

17. The antenna structure of claim 15, wherein a distance from the first parasitic radiating portion to the coupling radiating portion is greater than or equal to 3 mm.

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

and a second parasitic radiation part coupled to the ground potential and disposed on the first surface of the dielectric substrate.

19. The antenna structure of claim 18 wherein the second parasitic radiating portion has an inverted L-shape.

20. The antenna structure of claim 18, wherein a distance from the second parasitic radiating portion to the feeding radiating portion is greater than or equal to 3 mm.