Antenna structure

Abstract

An antenna structure. The antenna structure includes: a metal structure, a dielectric substrate, a feed radiation part, and a coupling radiation part; the metal structure has a slot, wherein the slot has a first closed end and a second closed end; the dielectric substrate has a first surface and a second surface opposite to each other; the feed radiation part is coupled to a signal source and is disposed on the second surface of the dielectric substrate, wherein the feed radiation part has a first vertical projection on the metal structure; the coupling radiation part is coupled to a ground potential and is disposed on the first surface of the dielectric substrate, wherein the coupling radiation part has a second vertical projection on the metal structure; wherein the second vertical projection of the coupling radiation part at least partially overlaps with the first vertical projection of the feed radiation part. The antenna structure of the present invention can have the advantages of small size, wide bandwidth, low manufacturing cost, and adaptability to different environments, so it is very suitable for application in various mobile communication devices.

Description

Technical Field

[0001] The present invention relates to an antenna structure, and in particular to a multi-band antenna structure. Background Art

[0002] 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 hybrid portable electronic devices. 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 use 2.4GHz, 5.2GHz and 5.8GHz frequency bands for communication.

[0003] 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.

[0004] Therefore, it is necessary to provide an antenna structure to solve the above problems. Summary of the invention

[0005] In a preferred embodiment, the present invention proposes an antenna structure, comprising: a metal structure component having a slot, wherein the slot has a first closed end and a second closed end; a dielectric substrate having a first surface and a second surface opposite to each other; a feed radiating portion coupled to a signal source and disposed on the second surface of the dielectric substrate, wherein the feed radiating portion has a first vertical projection on the metal structure component; and a coupling radiating portion coupled to a ground potential and disposed on the first surface of the dielectric substrate, wherein the coupling radiating portion has a second vertical projection on the metal structure component; wherein the second vertical projection of the coupling radiating portion at least partially overlaps with the first vertical projection of the feed radiating portion.

[0006] In some embodiments, the antenna structure can cover a first frequency band, a second frequency band, and a third frequency band, the first frequency band being between 2400 MHz and 2495 MHz, the second frequency band being between 5170 MHz and 5835 MHz, and the third frequency band being between 5925 MHz and 7125 MHz.

[0007] In some embodiments, the length of the slot is between 1 / 4 and 1 / 2 times the wavelength of the first frequency band.

[0008] In some embodiments, the first vertical projection of the feeding radiation portion is completely located inside the slot.

[0009] In some embodiments, the feeding radiation portion is in a straight strip shape.

[0010] In some embodiments, the feeding radiation portion has a first end and a second end, the first end of the feeding radiation portion is adjacent to the coupling radiation portion, and a feeding point coupled to the signal source is located between the first end and the second end of the feeding radiation portion.

[0011] In some embodiments, the antenna structure further includes: a conductive through-element penetrating the dielectric substrate, wherein the feeding point of the feeding radiation portion is coupled to the signal source via the conductive through-element.

[0012] In some embodiments, a distance from the feeding point to the first end of the feeding radiation portion is between 1 / 4 and 1 / 3 of the wavelength of the second frequency band.

[0013] 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 and 1 / 2 times the length of the slot.

[0014] In some embodiments, the second vertical projection of the coupled radiation portion is at least partially located inside the slot.

[0015] In some embodiments, the coupled radiation portion is in an L-shape or a T-shape.

[0016] In some embodiments, a notch is formed at a corner of the coupling radiation portion.

[0017] In some embodiments, the coupled radiation portion has a first end and a second end, a ground point coupled to the ground potential is located at the first end of the coupled radiation portion, and the second end of the coupled radiation portion is an open end.

[0018] In some embodiments, the length of the coupled radiation portion is less than or equal to 1 / 2 times the wavelength of the third frequency band.

[0019] In some embodiments, the antenna structure further includes: a first parasitic radiation portion coupled to the ground potential and disposed on the first surface of the dielectric substrate.

[0020] In some embodiments, the first parasitic radiation portion is in a widened L-shape.

[0021] In some embodiments, a distance from the first parasitic radiation portion to the coupled radiation portion is greater than or equal to 3 mm.

[0022] In some embodiments, the antenna structure further includes: a second parasitic radiation portion coupled to the ground potential and disposed on the first surface of the dielectric substrate.

[0023] In some embodiments, the second parasitic radiation portion is in an inverted L-shape.

[0024] In some embodiments, a distance from the second parasitic radiation portion to the feeding radiation portion is greater than or equal to 3 mm.

[0025] The present invention proposes a novel antenna structure that can be integrated with a metal structure of a mobile device. Compared with the traditional design, the antenna structure of the present invention can have the advantages of small size, wide bandwidth, low manufacturing cost, and adaptability to different environments, so it is very suitable for application in various mobile communication devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1A A three-dimensional diagram showing an antenna structure according to an embodiment of the present invention.

[0027] Figure 1B A top view showing a metal structure component of an antenna structure according to an embodiment of the present invention.

[0028] Figure 1C A top view showing a portion of components of an antenna structure on a first surface of a dielectric substrate according to an embodiment of the present invention.

[0029] Figure 1D A perspective view showing another portion of components of the antenna structure on the second surface of the dielectric substrate according to an embodiment of the present invention.

[0030] Figure 1E A cross-sectional view of an antenna structure according to an embodiment of the present invention is shown.

[0031] Figure 2 A voltage standing wave ratio diagram of an antenna structure according to an embodiment of the present invention is shown.

[0032] Figure 3 A VSWR plot showing the antenna structure when the ground point is removed from the coupled radiating portion.

[0033] Figure 4A A three-dimensional diagram showing an antenna structure according to an embodiment of the present invention.

[0034] Figure 4B A top view showing a metal structure component of an antenna structure according to an embodiment of the present invention.

[0035] Figure 4C A top view showing a portion of components of an antenna structure on a first surface of a dielectric substrate according to an embodiment of the present invention.

[0036] Figure 4D A perspective view showing another portion of components of the antenna structure on the second surface of the dielectric substrate according to an embodiment of the present invention.

[0037] Figure 4E A cross-sectional view of an antenna structure according to an embodiment of the present invention is shown.

[0038] Figure 5 A voltage standing wave ratio diagram of an antenna structure according to an embodiment of the present invention is shown.

[0039] Figure 6 A radiation efficiency diagram of an antenna structure according to an embodiment of the present invention is shown.

[0040] Main component symbols:

[0041] 100, 400 antenna structure

[0042] 110, 410 Metal components

[0043] 115, 415 Support elements

[0044] 120, 420 slots

[0045] 121, 421 First closed end

[0046] 122, 422 Second closed end

[0047] 130, 430 Feed radiation part

[0048] 131, 431 Feeding into the first end of the radiation part

[0049] 132, 432 feed into the second end of the radiation portion

[0050] 140, 440 coupled radiation part

[0051] 141, 441 first end of the coupled radiation portion

[0052] 142, 442 second end of the coupled radiation portion

[0053] 150, 450 Conductive feedthrough components

[0054] 180, 480 dielectric substrate

[0055] 190, 490 signal source

[0056] 443 The third end of the coupled radiation portion

[0057] 445 Notch of the coupled radiation part

[0058] 460 First Parasitic Radiation Unit

[0059] 461 First end of the first parasitic radiation portion

[0060] 462 The second end of the first parasitic radiation portion

[0061] 470 Second Parasitic Radiation Unit

[0062] 471 The first end of the second parasitic radiation portion

[0063] 472 The second end of the second parasitic radiation portion

[0064] CP connection point

[0065] D1, D2, D3, D4, D5, D6 spacing

[0066] DA, DB overlap distance

[0067] E1, E3 first surface

[0068] E2, E4 Second surface

[0069] FB1, FB4 First frequency band

[0070] FB2, FB5 Second frequency band

[0071] FB3, FB6 Third frequency band

[0072] FP1, FP2 feed point

[0073] GP1, GP2 grounding point

[0074] H1, H2 thickness

[0075] L1, L2, L3, L4 Length

[0076] LC1, LC2 hatching

[0077] VSS Ground potential DETAILED DESCRIPTION

[0078] 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 and described in detail with reference to the accompanying drawings.

[0079] 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. The 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 and achieve the basic technical effect within a certain error range. 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.

[0080] Figure 1A The 3D diagram of the antenna structure 100 according to one embodiment of the present invention is shown. The antenna structure 100 can be applied to a mobile device, such as a smart phone, a tablet computer, or a notebook computer. Figure 1A As shown, the antenna structure 100 at least includes: a metal mechanism element 110, a feeding radiation element 130, a coupling radiation element 140, and a 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 their alloys.

[0081] The metal structure component 110 may be a metal shell of a mobile device. In some embodiments, the metal structure 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 structure component 110 may be what is commonly known as "Part A" in the notebook computer field. The metal structure component 110 has a slot 120, wherein the slot 120 of the metal structure component 110 may be roughly 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 away from each other. The antenna structure 100 may also include a non-conductive material that is filled in the slot 120 of the metal structure component 110 to achieve a waterproof or dustproof function.

[0082] The dielectric substrate 180 may be a FR4 (Flame Retardant 4) substrate, a printed circuit board (PCB), or a flexible printed circuit (FPC). The dielectric substrate 180 has a substrate vertical projection on the metal structure component 110, and the substrate vertical projection can completely cover the slot 120 of the metal structure 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 structure component 110. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to the spacing between two corresponding components being less than a predetermined distance (for example, 5 mm or shorter), but generally does not include the situation where the two corresponding components are in direct contact with each other (that is, the aforementioned spacing is shortened to 0). The coupling radiation portion 140 may be disposed on the first surface E1 of the dielectric substrate 180, and the feeding radiation portion 130 may be disposed on the second surface E2 of the dielectric substrate 180; or, the coupling radiation portion 140 may be disposed on the second surface E2 of the dielectric substrate 180, and the feeding radiation portion 130 may be disposed on the first surface E1 of the dielectric substrate 180. Both designs do not affect the efficacy of the present invention. In some embodiments, the antenna structure 100 further includes a support element 115, which may be made of a non-conductive material, such as a plastic material. The support element 115 may be disposed on the metal structure component 110, and is used to support and fix the dielectric substrate 180 and all the components thereon. The support element 115 may be used to prevent the feeding radiation portion 130 from directly contacting the metal structure component 110. It must be understood that the support element 115 is only an optional element and may be removed in other embodiments. Figure 1BA top view of a metal structure component 110 of an antenna structure 100 according to an embodiment of the present invention is shown. Figure 1C A top view showing a portion of components of the antenna structure 100 on the first surface E1 of the dielectric substrate 180 according to an embodiment of the present invention. Figure 1D A perspective view showing another portion of components of the antenna structure 100 according to an embodiment of the present invention on the second surface E2 of the dielectric substrate 180 (ie, the dielectric substrate 180 is regarded as a transparent component). Figure 1E A cross-sectional view (along a cross-sectional line LC1) of an antenna structure 100 according to an embodiment of the present invention is shown. Figure 1A , Figure 1B , Figure 1C , Figure 1D , Figure 1E To understand the present invention.

[0083] The feeding radiation portion 130 may be substantially in the shape of a straight strip. A feeding point FP1 of the feeding radiation portion 130 may be coupled to a 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 radiation portion 130 has a first end 131 and a second end 132, which are two open ends away from each other, and the first end 131 of the feeding radiation portion 130 is adjacent to the coupling radiation portion 140. In addition, the feeding point FP1 may be located between the first end 131 and the second end 132 of the feeding radiation portion 130, and relatively closer to the second end 132 of the feeding radiation portion 130. The feeding radiation portion 130 has a first vertical projection on the metal structure component 110, and the first vertical projection may be completely located inside the slot 120 of the metal structure component 110.

[0084] In some embodiments, the antenna structure 100 further includes a conductive via element 150, which can penetrate the dielectric substrate 180 and connect between the first surface E1 and the second surface E2. The feed point FP1 of the feed radiation portion 130 can be further coupled to the signal source 190 via the conductive via element 150. However, the present invention is not limited thereto. In other embodiments, the conductive via element 150 can also be omitted, so that the feed point FP1 of the feed radiation portion 130 is directly coupled to the signal source 190. In some embodiments, the signal source 190 uses a coaxial cable (Coaxial Cable) (not shown) to excite the feed radiation portion 130.

[0085] The coupling radiation portion 140 may be substantially in the shape of an L-shape with equal width. In detail, the coupling radiation portion 140 has a first end 141 and a second end 142, wherein a 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. For example, the ground potential VSS may be provided by a ground copper foil (not shown), which may be further coupled to the metal structure component 110. The coupling radiation portion 140 has a second vertical projection on the metal structure component 110, and the second vertical projection may be at least partially located inside the slot 120 of the metal structure component 110. In addition, the second vertical projection of the coupling radiation portion 140 at least partially overlaps with the first vertical projection of the feeding radiation portion 130. Therefore, a coupling gap may be formed between the second end 142 of the coupling radiation portion 140 and the first end 131 of the feeding radiation portion 130 .

[0086] Figure 2 The voltage standing wave ratio (VSWR) diagram of the antenna structure 100 according to an embodiment of the present invention is shown, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the voltage standing wave ratio. Figure 2 According to the measurement results, 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 can be between 2400MHz and 2495MHz, the second frequency band FB2 can be between 5170MHz and 5835MHz, and the third frequency band FB3 can be between 5925MHz and 7125MHz. Therefore, the antenna structure 100 can at least support the broadband operation of the new generation Wi-Fi 6E.

[0087] In terms of antenna principle, an equivalent capacitor can be formed between the first end 131 of the feeding radiation portion 130 and the second end 142 of the coupling radiation portion 140, so that the feeding radiation portion 130 and the coupling radiation portion 140 can be almost considered as a loop structure. In addition, the slot 120 of the metal structure component 110 can be coupled and excited by the aforementioned loop structure to fully cover the broadband operation of the first frequency band FB1, the second frequency band FB2, and the third frequency band FB3.

[0088] Figure 3 The VSWR diagram of the antenna structure 100 is shown when the ground point GP1 is removed from the coupled radiation portion 140. Figure 2 , Figure 3It can be seen that the ungrounded coupled radiating portion 140 will not allow the antenna structure 100 to cover the second frequency band FB2 and the third frequency band FB3. Therefore, the coupled radiating portion 140 with the grounding point GP1 of the present invention can greatly increase the operation bandwidth of the antenna structure 100.

[0089] In some embodiments, the element dimensions of the antenna structure 100 may be as follows. The length L1 of the slot 120 of the metal structure 110 (i.e., the length L1 from the first closed end 121 to the second closed end 122) may be between 1 / 4 times and 1 / 2 times the wavelength of the first frequency band FB1 of the antenna structure 100 (λ / 4 to λ / 2). The distance D1 from the feed point FP1 to the first end 131 of the feed radiation portion 130 may be between 1 / 4 times and 1 / 8 times the wavelength of the second frequency band FB2 of the antenna structure 100 (λ / 4 to λ / 8). The distance D2 from the feed point FP1 to the first closed end 121 of the slot 120 may be between 1 / 3 times and 1 / 2 times the length L1 of the slot 120. The length L2 of the coupling radiation portion 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 0.2 mm and 1.6 mm. The overlapping distance DA between the first end 131 of the feeding radiation portion 130 and the second end 142 of the coupling radiation portion 140 may be greater than or equal to 1 mm. The above range of component sizes is obtained based on multiple experimental results, which helps to optimize the operating bandwidth and impedance matching of the antenna structure 100.

[0090] Figure 4A A three-dimensional diagram of an antenna structure 400 according to an embodiment of the present invention is shown. Figure 4A In the embodiment of the present invention, the antenna structure 400 includes: a metal structure component 410, a feeding radiation portion 430, a coupling radiation portion 440, a conductive through-element 450, a first parasitic radiation portion (Parasitic Radiation Element) 460, a second parasitic radiation portion 470, and a dielectric substrate 480, wherein the feeding radiation portion 430, the coupling radiation portion 440, the first parasitic radiation portion 460, and the second parasitic radiation portion 470 can all be made of metal materials.

[0091] The metal structure 410 has a slot 420, wherein the slot 420 of the metal structure 410 may be substantially in the shape of a straight strip. Specifically, the slot 420 may have a first closed end 421 and a second closed end 422 that are away from each other. The antenna structure 400 may also include a non-conductive material that is filled in the slot 420 of the metal structure 410 to achieve a waterproof or dustproof function.

[0092] The dielectric substrate 480 may be a 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 structure 410. The coupling radiation portion 440, the first parasitic radiation portion 460, and the second parasitic radiation portion 470 may all be disposed on the first surface E3 of the dielectric substrate 480, and the feeding radiation portion 430 may be disposed on the second surface E4 of the dielectric substrate 480; or, the coupling radiation portion 440, the first parasitic radiation portion 460, and the second parasitic radiation portion 470 may all be disposed on the second surface E4 of the dielectric substrate 480, and the feeding radiation portion 430 may be disposed on the first surface E3 of the dielectric substrate 480. In some embodiments, the antenna structure 400 further includes a supporting element 415, which may be made of a non-conductive material. The support element 415 may be disposed on the metal structure 410 and used to support and fix the dielectric substrate 480 and all the elements thereon. Figure 4B A top view of a metal structure component 410 of an antenna structure 400 according to an embodiment of the present invention is shown. Figure 4C A top view showing a portion of components of the antenna structure 400 according to an embodiment of the present invention on the first surface E3 of the dielectric substrate 480 . Figure 4D A perspective view showing another portion of components of the antenna structure 400 according to an embodiment of the present invention on the second surface E4 of the dielectric substrate 480 (ie, the dielectric substrate 480 is regarded as a transparent component). Figure 4E A cross-sectional view (along a cross-sectional line LC2) of an antenna structure 400 according to an embodiment of the present invention is shown. Figure 4A , Figure 4B , Figure 4C , Figure 4D , Figure 4E To understand the present invention.

[0093] The feeding radiation portion 430 may be substantially in the shape of a straight strip. A feeding point FP2 of the feeding radiation portion 430 may be coupled to a signal source 490. For example, the signal source 490 may be a radio frequency module, which may be used to excite the antenna structure 400. In detail, the feeding radiation portion 430 has a first end 431 and a second end 432, which are two open ends away from each other, and the first end 431 of the feeding radiation portion 430 is adjacent to the coupling radiation portion 440. In addition, the feeding point FP2 may be located between the first end 431 and the second end 432 of the feeding radiation portion 430, and relatively closer to the second end 432 of the feeding radiation portion 430. The feeding radiation portion 430 has a first vertical projection on the metal structure component 410, and this first vertical projection may be completely located inside the slot 420 of the metal structure component 410. In some embodiments, the conductive via 450 can penetrate the dielectric substrate 480 and connect between the first surface E3 and the second surface E4 , so that the feeding point FP2 of the feeding radiation portion 430 can be further coupled to the signal source 490 via the conductive via 450 .

[0094] The coupling radiation portion 440 may generally present a widened T-shape. In detail, the coupling radiation portion 440 has a first end 441, a second end 442, and a third end 443, wherein a ground 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 away from each other. In some embodiments, a rectangular notch 445 is formed at a corner of the coupling radiation portion 440, which is adjacent to the second end 442 of the coupling radiation portion 440. The coupling radiation portion 440 has a second vertical projection on the metal structure component 410, and the second vertical projection may be at least partially located inside the slot 420 of the metal structure component 410. In addition, the second vertical projection of the coupling radiation portion 440 at least partially overlaps with the first vertical projection of the feeding radiation portion 430. Therefore, a coupling gap may be formed between the second end 442 of the coupling radiation portion 440 and the first end 431 of the feeding radiation portion 430 .

[0095] The first parasitic radiation portion 460 may be substantially in the shape of a widened L. Specifically, 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 in a direction close to the coupled radiation portion 440. The first parasitic radiation portion 460 has a third vertical projection on the metal structure component 410, and the third vertical projection may be at least partially located inside the slot 420 of the metal structure component 410.

[0096] The second parasitic radiation portion 470 may be substantially in the shape of an inverted L. Specifically, 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 feed 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 structure component 410, and the fourth vertical projection may be at least partially located inside the slot 420 of the metal structure component 410.

[0097] Figure 5 The voltage standing wave ratio diagram of the antenna structure 400 according to an embodiment of the present invention is shown, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the voltage standing wave ratio. Figure 5 According to the measurement results of FIG. 4 , the antenna structure 400 can cover a first frequency band FB4, a second frequency band FB5, and a third frequency band FB6. For example, the first frequency band FB4 can be between 2400MHz and 2495MHz, the second frequency band FB5 can be between 5170MHz and 5835MHz, and the third frequency band FB6 can be between 5925MHz and 7125MHz. Therefore, the antenna structure 400 can at least support the broadband operation of the new generation Wi-Fi 6E.

[0098] Figure 6 The radiation efficiency (RadiationEfficiency) diagram of the antenna structure 400 according to an embodiment of the present invention is shown, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the radiation efficiency (%). Figure 6 According to the measurement results, 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 actual application requirements of general mobile communication devices.

[0099] In terms of antenna principle, an equivalent capacitor can be formed between the first end 431 of the feed radiation portion 430 and the second end 442 of the coupling radiation portion 440, so that the feed radiation portion 430 and the coupling radiation portion 440 can be almost considered as a loop structure together. The slot 420 of the metal mechanism component 410 can be coupled and excited by the aforementioned loop structure to fully cover the broadband operation of the first frequency band FB4, the second frequency band FB5, and the third frequency band FB6. According to actual measurement results, the addition of the first parasitic radiation portion 460 and the second parasitic radiation portion 470 can fine-tune the impedance matching of the first frequency band FB4, the second frequency band FB5, and the third frequency band FB6. Therefore, the antenna structure 400 can be applied to communication devices in various environments while maintaining its good radiation performance.

[0100] 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 structure 410 (i.e., the length L3 from the first closed end 421 to the second closed end 422) may be between 1 / 4 times and 1 / 2 times the wavelength of the first frequency band FB4 of the antenna structure 400 (λ / 4 to λ / 2). The spacing D3 from the feed point FP2 to the first end 431 of the feed radiation portion 430 may be between 1 / 4 times and 1 / 8 times the wavelength of the second frequency band FB5 of the antenna structure 400 (λ / 4 to λ / 8). The spacing D4 from the feed point FP2 to the second closed end 422 of the slot 420 may be between 1 / 3 times and 1 / 2 times the length L3 of the slot 420. The length L4 of the coupling radiation portion 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 times the wavelength (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 0.2 mm and 1.6 mm. The overlapping distance DB between the first end 431 of the feeding radiation portion 430 and the second end 442 of the coupling radiation portion 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 coupling radiation portion 440 may be greater than or equal to 3 mm. The distance D6 from the first end 471 of the second parasitic radiation portion 470 to the second end 432 of the feeding radiation portion 430 may be greater than or equal to 3 mm. The above ranges of component sizes are obtained based on multiple experimental results, which help to optimize the operating bandwidth and impedance matching of the antenna structure 400.

[0101] The present invention proposes a novel antenna structure that can be integrated with a metal structure of a mobile device. Compared with the traditional design, the antenna structure of the present invention can have the advantages of small size, wide bandwidth, low manufacturing cost, and adaptability to different environments, so it is very suitable for application in various mobile communication devices.

[0102] It is worth noting that the above-mentioned element size, element shape, element 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 Figure 1A-Figure 6 The present invention may only include Figure 1A-Figure 6 In other words, not all the features shown in the figures need to be implemented in the antenna structure of the present invention at the same time.

[0103] 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.

[0104] 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 what is defined in the attached claims.

Claims

1. An antenna structure, comprising: A metal structure component having a slot, wherein the slot has a first closed end and a second closed end; A dielectric substrate having a first surface and a second surface opposite to each other; a feeding radiation portion, the feeding radiation portion is coupled to a signal source and is disposed on the second surface of the dielectric substrate, wherein the feeding radiation portion has a first vertical projection on the metal structure component; as well as a coupled radiation portion, the coupled radiation portion is coupled to a ground potential and is disposed on the first surface of the dielectric substrate, wherein the coupled radiation portion has a second vertical projection on the metal structure component; wherein the second vertical projection of the coupling radiation portion at least partially overlaps with the first vertical projection of the feeding radiation portion; The antenna structure can cover a first frequency band, a second frequency band, and a third frequency band, wherein the first frequency band is between 2400 MHz and 2495 MHz, the second frequency band is between 5170 MHz and 5835 MHz, and the third frequency band is between 5925 MHz and 7125 MHz; The length of the coupled radiation portion is less than or equal to 1 / 2 times the wavelength of the third frequency band. 2 . The antenna structure as claimed in claim 1 , wherein the length of the slot is between 1 / 4 and 1 / 2 times the wavelength of the first frequency band. 3 . The antenna structure as claimed in claim 1 , wherein the first vertical projection of the feed radiation portion is completely located inside the slot. The antenna structure as claimed in claim 1 , wherein the feed radiation portion is in a straight strip shape.

5. The antenna structure as claimed in claim 1, wherein the feed radiation portion has a first end and a second end, the first end of the feed radiation portion is adjacent to the coupling radiation portion, and a feeding point coupled to the signal source is located between the first end and the second end of the feed radiation portion.

6. The antenna structure according to claim 5, further comprising: A conductive through-element is provided, the conductive through-element penetrates the dielectric substrate, wherein the feeding point of the feeding radiation portion is coupled to the signal source via the conductive through-element. 7 . The antenna structure as claimed in claim 5 , wherein a distance from the feeding point to the first end of the feeding radiation portion is between 1 / 4 and 1 / 8 of the wavelength of the second frequency band. 8 . The antenna structure as claimed in claim 5 , 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 the length of the slot. 9 . The antenna structure as claimed in claim 1 , wherein the second vertical projection of the coupled radiation portion is at least partially located inside the slot. 10 . The antenna structure as claimed in claim 1 , wherein the coupled radiation portion is in an L-shape or a T-shape. The antenna structure as claimed in claim 1 , wherein a notch is formed at a corner of the coupling radiation portion.

12. The antenna structure as claimed in claim 1, wherein the coupled radiating 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 coupled radiating portion, and the second end of the coupled radiating portion is an open end.

13. The antenna structure according to claim 1, further comprising: A first parasitic radiation portion is coupled to the ground potential and is disposed on the first surface of the dielectric substrate. 14 . The antenna structure as claimed in claim 13 , wherein the first parasitic radiation portion presents a widened L-shape. 15 . The antenna structure as claimed in claim 13 , wherein a distance from the first parasitic radiation portion to the coupled radiation portion is greater than or equal to 3 mm.

16. The antenna structure according to claim 1, further comprising: A second parasitic radiation portion is coupled to the ground potential and is disposed on the first surface of the dielectric substrate. The antenna structure as claimed in claim 16 , wherein the second parasitic radiation portion is in an inverted L-shape. 18 . The antenna structure as claimed in claim 16 , wherein a distance from the second parasitic radiating portion to the feeding radiating portion is greater than or equal to 3 mm.

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