CN117393997A

CN117393997A - Antenna structure

Info

Publication number: CN117393997A
Application number: CN202210779668.5A
Authority: CN
Inventors: 吴子民; 赖国仁; 古光原; 林宏颖; 曾文泰
Original assignee: Wistron Neweb Corp
Current assignee: Wistron Neweb Corp
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2024-01-12

Abstract

An antenna structure. The antenna structure comprises: a grounding element, a feed-in radiation part, a first radiation part, a second radiation part, a first coupling branch and a dielectric substrate; the feed-in radiation part is provided with a feed-in point; the first radiation part is coupled to the feed radiation part. The second radiation part is coupled to the feed radiation part, and extends in the opposite direction with the first radiation part; the first coupling branch is coupled to a first grounding point on the grounding element and extends across the first radiating portion, wherein the first coupling branch comprises a first coil portion and a first connecting portion; the dielectric substrate is provided with a first surface and a second surface which are opposite. The invention provides a novel antenna structure, which has at least the advantages of small size, wide frequency band, low posture, low manufacturing cost and the like compared with the traditional design, so that the novel 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, and more particularly, to a broadband (Wideband) antenna structure.

Background

With the development of mobile communication technology, mobile devices are becoming increasingly popular in recent years, and common examples are: portable computers, mobile phones, multimedia players, and other portable electronic devices with hybrid functions. To meet the needs of people, mobile devices often have wireless communication capabilities. Some cover long range wireless communication ranges, such as: mobile phones use 2G, 3G, LTE (Long Term Evolution) systems and the frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz for communication, while some cover short range wireless communication ranges, such as: wi-Fi 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, wide-band antenna element is an important issue for antenna designers.

Accordingly, there is a need to provide an antenna structure to solve the above-mentioned problems.

Disclosure of Invention

In a preferred embodiment, the present invention provides an antenna structure, comprising: a grounding element; a feed-in radiation part with a feed-in point; a first radiation part coupled to the feed radiation part; the second radiation part is coupled to the feed radiation part, and the second radiation part and the first radiation part extend in opposite directions; a first coupling branch coupled to a first ground point on the ground element and extending across the first radiating portion, wherein the first coupling branch includes a first coil portion and a first connecting portion; and a dielectric substrate having a first surface and a second surface opposite to each other, wherein the feed-in radiation portion, the first radiation portion, the second radiation portion, and the first connection portion of the first coupling branch are all distributed on the first surface of the dielectric substrate, and the first coil portion of the first coupling branch is distributed on the second surface of the dielectric substrate.

In some embodiments, the antenna structure further comprises: the second coupling branch is coupled to a second grounding point on the grounding element and is adjacent to the second radiation part.

In some embodiments, the first coupling leg further comprises: a first conductive through element penetrating the dielectric substrate, wherein one end of the first connection portion is coupled to the first ground point through the first conductive through element; a second conductive through element penetrating the dielectric substrate, wherein the other end of the first connection portion is coupled to one end of the first coil portion via the second conductive through element; a first connecting section; and a first coupling section coupled to the other end of the first coil portion via the first connecting section, wherein the first connecting section, the first coupling section, and the grounding element are disposed on the second surface of the dielectric substrate.

In some embodiments, the first connection portion of the first coupling branch exhibits a straight or a spiral shape.

In some embodiments, the second coupling leg exhibits an inverted L-shape.

In some embodiments, the second coupling branch further extends across the second radiating portion and includes a second coil portion.

In some embodiments, the second coupling leg further comprises: the second connecting part is arranged on the first surface of the dielectric substrate; a third conductive through element penetrating the dielectric substrate, wherein one end of the second connection portion is coupled to the second ground point through the third conductive through element; a fourth conductive through element penetrating the dielectric substrate, wherein the other end of the second connection portion is coupled to one end of the second coil portion via the fourth conductive through element; a second connecting section; and a second coupling section coupled to the other end of the second coil portion via a second connection section, wherein the second connection section, the second coupling section, and the grounding element are disposed on the second surface of the dielectric substrate.

In some embodiments, the second connecting portion of the second coupling leg exhibits a straight or a spiral shape.

In some embodiments, the first radiating portion includes a third coil portion.

In some embodiments, the first radiating portion further comprises: the third connecting part is arranged on the second surface of the dielectric substrate; a fifth conductive through element penetrating the dielectric substrate, wherein one end of the third connection portion is coupled to the third coil portion via the fifth conductive through element; a straight strip-shaped portion, wherein the third coil portion and the straight strip-shaped portion are both disposed on the first surface of the dielectric substrate; and a sixth conductive through element penetrating the dielectric substrate, wherein the other end of the third connection portion is coupled to the straight bar portion via the sixth conductive through element.

In some embodiments, the antenna structure encompasses a low frequency band between 600MHz and 960MHz and a high frequency band between 1100MHz and 6000 MHz.

In some embodiments, the total length of the feed radiation portion and the first radiation portion is less than or equal to 0.5 times the wavelength of the low frequency band.

In some embodiments, the total length of the feed radiating portion and the second radiating portion is less than or equal to 0.5 times the wavelength of the high frequency band.

In another preferred embodiment, the present invention provides an antenna structure, comprising: a grounding element; a feed-in radiation part with a feed-in point; a first radiation part coupled to the feed radiation part; the second radiation part is coupled to the feed radiation part, and the second radiation part and the first radiation part extend in opposite directions; a first coupling branch including a coil portion and a first coupling section; a second coupling branch, wherein the first coupling branch and the second coupling branch are both coupled to a common ground point on the grounding element; the first radiation part and the second radiation part are distributed on the first surface of the medium substrate, and the coil part of the first coupling branch is distributed on the second surface of the medium substrate; wherein the feed-in radiation part, the first radiation part and the second radiation part are all arranged between the grounding element and the first coupling branch or the second coupling branch.

In some embodiments, the combination of the feed radiating portion, the first radiating portion, and the second radiating portion exhibits a T-shape.

In some embodiments, the grounding element includes a grounding branch, and the common ground point is located at one end of the grounding branch.

In some embodiments, the grounding element and the first coupling section of the first coupling branch are distributed on the first surface or the second surface of the dielectric substrate.

In some embodiments, the first coupling leg further comprises: a connection part arranged on the first surface of the dielectric substrate; a first conductive through element penetrating the dielectric substrate, wherein one end of the connection portion is coupled to the common ground point through the first conductive through element; a second conductive through element penetrating the dielectric substrate, wherein the other end of the connection portion is coupled to one end of the coil portion via the second conductive through element; and a first connection section, wherein the first coupling section is coupled to the other end of the coil portion via the first connection section, wherein the first connection section, the first coupling section, and the grounding element are disposed on the second surface of the dielectric substrate.

In some embodiments, the second coupling leg presents a serpentine shape or an L-shape and is adjacent to the first coupling leg.

The present invention proposes a novel antenna structure. Compared with the traditional design, the invention has the advantages of at least small size, wide frequency band, low posture, low manufacturing cost and the like, so that the invention is very suitable for being applied to various mobile communication devices.

Drawings

Fig. 1A shows a top view of an antenna structure according to an embodiment of the invention.

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

Fig. 1C 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. 1D shows a side view of an antenna structure according to an embodiment of the invention.

Fig. 2 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 3 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 4A shows a top view of a coil portion according to an embodiment of the invention.

Fig. 4B shows a top view of a coil portion according to an embodiment of the invention.

Fig. 4C shows a top view of a coil portion according to an embodiment of the invention.

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

Fig. 6 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 7 shows a top view of an antenna structure according to an embodiment of the invention.

Fig. 8 shows a top view of an antenna structure according to an embodiment of the invention.

Description of main reference numerals:

100. 200, 300, 500, 600, 700, 800 antenna structure

110. Grounding element

115. Grounding support

120. Feed-in radiation part

121. First end of feed-in radiation part

122. A second end of the feed-in radiation part

130. 330 first radiating portion

131. First end of the first radiation part

132. A second end of the first radiation part

140. A second radiation part

141. First end of the second radiation part

142. A second end of the second radiation part

150. 550, 650, 850 first coupling branches

151. 551 first connecting portion

152. 652, 752, 852 first electrically conductive pass-through member

153. 653, 753, 853 second conductive through element

154. First coil part

155. 655, 755, 855 first coupling segment

156. 656, 756, 856 first end of first coupling segment

157. 657, 757, 857 second end of the first coupling section

158. 658, 758, 858 first connection segment

160. 260, 560, 660, 760, 860 second coupling branch

161. 661, 761, 861 second coupling branch first end

162. 662, 762, 862 second ends of the second coupling legs

170. Dielectric substrate

261. 561 second connection portion

262. Third conductive through element

263. Fourth conductive through element

264. A second coil part

265. 665, 765, 865 second coupling segments

266. First end of second coupling section

267. Second end of the second coupling section

268. 668, 768, 868 second connecting section

331. Third coil part

332. Third connecting portion

333. Fifth conductive through element

334. Sixth conductive through element

335. Straight strip-shaped part

651. 751, 851 connecting portions

654. 754, 854 coil portion

FP feed point

GC1, GC3, GC5, GC7 first coupling gap

GC2, GC4, GC6, GC8 second coupling gap

GP1 first grounding point

GP2 second grounding point

GPC common ground point

L1, L2 Total length

E1 A first surface

E2 A second surface

Detailed Description

The following detailed description of the invention refers to the accompanying drawings, which illustrate specific embodiments of the invention.

Certain terms are used throughout the description and claims to refer to particular components. Those of ordinary skill in the art will appreciate that a hardware manufacturer may refer to the same element by different names. The description and claims do not take the form of an element differentiated by name, but rather by functional differences. 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 that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, and achieve the basic technical effect. In addition, the term "coupled" as used herein includes any direct or indirect electrical connection. Accordingly, 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.

The following disclosure provides many different embodiments, or examples, for implementing different features of the disclosure. The following disclosure describes specific examples of various components and arrangements thereof to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the specification describes a first feature being formed on or over a second feature, that means that it may include embodiments in which the first feature is in direct contact with the second feature, and that additional features may be formed between the first feature and the second feature, such that the first feature and the second feature may not be in direct contact. In addition, the following description may repeat use of the same reference characters or (and) reference numerals. These repetition are for the purpose of simplicity and clarity and do not in itself dictate a particular relationship between the various embodiments or (and) configurations discussed.

Furthermore, spatially relative terms such as "under" …, "below," "lower," "above," "upper," and the like are used for convenience in describing the relationship of one element or feature to another element(s) or feature in the figures. In addition to the orientations depicted in the drawings, the spatially dependent terms are intended to encompass different orientations of the device in use or operation. The device may be turned to a different orientation (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Fig. 1A shows a top view of an antenna structure 100 according to an embodiment of the invention. The antenna structure 100 may be applied to a Mobile Device (Mobile Device), for example: a Smart Phone (Smart Phone), a Tablet Computer (Tablet Computer), or a notebook Computer (Notebook Computer). In the embodiment of fig. 1A, the antenna structure 100 comprises: a grounding Element (Ground Element) 110, a feeding radiation portion (Feeding Radiation Element) 120, a first radiation portion (Radiation Element) 130, a second radiation portion 140, a first Coupling Branch (Coupling Branch) 150, a second Coupling Branch 160, and a dielectric substrate (Dielectric Substrate) 170, wherein the grounding Element 110, the feeding radiation portion 120, the first radiation portion 130, the second radiation portion 140, the first Coupling Branch 150, and the second Coupling Branch 160 are all made of metal materials, for example: copper, silver, aluminum, iron, or alloys thereof. However, the present invention is not limited thereto. In other embodiments, the antenna structure 100 may not include the second coupling branch 160.

The dielectric substrate 170 may be an FR4 (frame reflector 4) substrate, a printed circuit board (Printed Circuit Board, PCB), or a flexible circuit board (Flexible Printed Circuit, FPC). The dielectric substrate 170 has a first surface E1 and a second surface E2 opposite to each other, wherein the feeding radiation portion 120, the first radiation portion 130, and the second radiation portion 140 are mainly distributed on the first surface E1 of the dielectric substrate 170, and the grounding element 110, the first coupling branch 150, and the second coupling branch 160 are mainly distributed on the second surface E2 of the dielectric substrate 170. The ground element 110 may be implemented by a ground copper foil (Ground Copper Foil), which may extend beyond the dielectric substrate 170 and may be coupled to a system ground plane (System Ground Plane) (not shown). Fig. 1B shows a top view of a portion of the elements of the antenna structure 100 on the first surface E1 of the dielectric substrate 170 according to an embodiment of the invention. Fig. 1C shows a perspective view of another part of the element of the antenna structure 100 on the second surface E2 of the dielectric substrate 170 according to an embodiment of the invention (i.e. the dielectric substrate 170 is regarded as a transparent element). Fig. 1D shows a side view of an antenna structure 100 according to an embodiment of the invention. Please refer to fig. 1A, fig. 1B, fig. 1C, fig. 1D together to understand the present invention.

The combination of the feed-in radiation portion 120, the first radiation portion 130, and the second radiation portion 140 may have a substantially T-shape. In detail, the Feeding radiation portion 120 has a first end 121 and a second end 122, wherein a Feeding Point FP is located at the first end 121 of the Feeding radiation portion 120. The feed point FP may also be coupled to a signal source (not shown). For example, the signal source may be a Radio Frequency (RF) module, which may be used to excite the antenna structure 100. The first radiating portion 130 has a first End 131 and a second End 132, wherein the first End 131 of the first radiating portion 130 is coupled to the second End 122 of the feeding radiating portion 120, and the second End 132 of the first radiating portion 130 is an Open End (Open End). The second radiating portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the second radiating portion 140 is coupled to the second end 122 of the feeding radiating portion 120, and the second end 142 of the second radiating portion 140 is an open end. For example, the second end 142 of the second radiating portion 140 and the second end 132 of the first radiating portion 130 may extend generally in opposite and distal directions.

The first coupling branch 150 is coupled to a first ground Point GP1 on the Grounding element 110, and may extend across the first radiating portion 130. In detail, the first Coupling branch 150 includes a first connection portion 151, a first conductive through element (Conductive Via Element) 152, a second conductive through element 153, a first Coil (Coil) portion 154, a first Coupling Segment (Coupling Segment) 155, and a first connection Segment (Connection Segment) 158, wherein the first connection portion 151 is disposed on the first surface E1 of the dielectric substrate 170, the first conductive through element 152 and the second conductive through element 153 penetrate through the dielectric substrate 170, and the first Coil portion 154, the first Coupling Segment 155, and the first connection Segment 158 are disposed on the second surface E2 of the dielectric substrate 170. The first connection portion 151 may have a substantially straight bar shape, wherein one end of the first connection portion 151 is coupled to the first ground point GP1 via the first conductive through member 152, and the other end of the first connection portion 151 is coupled to one end of the first coil portion 154 via the second conductive through member 153. In some embodiments, the first radiating portion 130 has a perpendicular projection (Vertical Projection) on the second surface E2 of the dielectric substrate 170, wherein the perpendicular projection of the first radiating portion 130 at least partially overlaps the first coil portion 154, the first connecting segment 158, or the first coupling segment 155. The first coupling section 155 has a first end 156 and a second end 157, wherein the first end 156 of the first coupling section 155 is coupled to the other end of the first coil portion 154 via the first connecting section 158, and the second end 157 of the first coupling section 155 is an open end. For example, a first Coupling Gap (GC 1) may be formed between the first radiating portion 130 and the first Coupling segment 155 of the first Coupling branch 150. However, the present invention is not limited thereto. In other embodiments, the grounding element 110 and the first coupling section 155 of the first coupling branch 150 may be disposed on the first surface E1 of the dielectric substrate 170 instead, and then connected with corresponding conductive through elements (not shown).

The second coupling branch 160 may substantially have an inverted L shape, which may be adjacent to the second radiation portion 140. In detail, the second coupling branch 160 has a first end 161 and a second end 162, wherein the first end 161 of the second coupling branch 160 is coupled to a second ground point GP2 on the ground element 110, and the second end 162 of the second coupling branch 160 is an open end. The second ground point GP2 is different from the first ground point GP1. For example, the second end 162 of the second coupling leg 160 and the second end 157 of the first coupling section 155 of the first coupling leg 150 may extend in substantially the same direction. In addition, a second coupling gap GC2 may be formed between the second radiation portion 140 and the second coupling branch 160. In the present embodiment, the second coupling branch 160 is disposed on the second surface E2 of the dielectric substrate 170. In other embodiments, the second coupling branch 160 may be disposed on the first surface E1 of the dielectric substrate 170 instead, and then be connected with a corresponding conductive through device (not shown). It should be noted that the term "adjacent" or "adjacent" in this specification may refer to the corresponding elements having a pitch less than a predetermined distance (e.g., 5mm or less), but generally does not include the case where the corresponding elements are in direct contact with each other (i.e., the pitch is reduced to 0).

According to the actual measurement result, the antenna structure 100 can cover a low frequency band and a high frequency band. For example, the low frequency band may be between 600MHz and 960MHz, and the high frequency band may be between 1100MHz and 6000 MHz. Thus, the antenna structure 100 will at least cover wideband operation of LTE (Long Term Evolution ). In terms of antenna principle, the first coupling branch 150 may be excited by coupling the feed radiation portion 120 and the first radiation portion 130 to form the aforementioned low frequency band, and the second coupling branch 160 may be excited by coupling the feed radiation portion 120 and the second radiation portion 140 to form the aforementioned high frequency band. It should be noted that, since the first coil portion 154 of the first coupling branch 150 can be used to replace a conventional inductor circuit (Inductive Circuit), the overall manufacturing cost of the present invention can be further reduced.

In some embodiments, the element dimensions and element parameters of the antenna structure 100 may be as follows. The total length L1 of the feeding radiation portion 120 and the first radiation portion 130 may be less than or equal to 0.5 times wavelength (λ/2) of the low frequency band of the antenna structure 100. The total length L2 of the feeding radiation portion 120 and the second radiation portion 140 may be less than or equal to 0.5 times wavelength (λ/2) of the high frequency band of the antenna structure 100. The width of the first coupling gap GC1 may be less than or equal to 2mm. The width of the second coupling gap GC2 may be less than or equal to 2mm. The equivalent inductance value of the first coil portion 154 of the first coupling branch 150 may be 1nH or more. The above ranges of element dimensions and element parameters are determined based on a number of experimental results, which helps to optimize the operating bandwidth (Operational Bandwidth) and impedance matching (Impedance Matching) of the antenna structure 100.

The following embodiments describe various configurations and detailed structural features of the antenna structure 100. It is to be understood that the drawings and descriptions are proffered by way of example only and are not intended to limit the scope of the invention.

Fig. 2 shows a top view of an antenna structure 200 according to an embodiment of the invention. Fig. 2 is similar to fig. 1A. In the embodiment of fig. 2, a second coupling branch 260 of the antenna structure 200 extends across the second radiating portion 140. In detail, the second coupling branch 260 includes a second connection portion 261, a third conductive through element 262, a fourth conductive through element 263, a second coil portion 264, a second coupling segment 265, and a second connection segment 268, wherein the second connection portion 261 is disposed on the first surface E1 of the dielectric substrate 170, the third conductive through element 262 and the fourth conductive through element 263 penetrate through the dielectric substrate 170, and the second coil portion 264, the second coupling segment 268, and the second coupling segment 265 are disposed on the second surface E2 of the dielectric substrate 170. The second connection portion 261 may have a substantially straight shape, wherein one end of the second connection portion 261 is coupled to the second ground point GP2 via the third conductive through element 262, and the other end of the second connection portion 261 is coupled to one end of the second coil portion 264 via the fourth conductive through element 263. In some embodiments, the second radiating portion 140 has a perpendicular projection on the second surface E2 of the dielectric substrate 170, wherein the perpendicular projection of the second radiating portion 140 at least partially overlaps the second coil portion 264, the second connecting segment 268, or (and) the second coupling segment 265. The second coupling section 265 has a first end 266 and a second end 267, wherein the first end 266 of the second coupling section 265 is coupled to the other end of the second coil portion 264 via the second connecting section 268, and the second end 267 of the second coupling section 265 is an open end. For example, the second end 267 of the second coupling segment 265 of the second coupling leg 260 and the second end 157 of the first coupling segment 155 of the first coupling leg 150 may extend in substantially the same direction. In the embodiment of fig. 2, the position of the first coil portion 154 of the first coupling branch 150 is shifted slightly upwards, such that the perpendicular projection of the first radiating portion 130 at least partially overlaps both the first coil portion 154 and the first connection section 158 of the first coupling branch 150. It should be noted that the overall impedance matching of the antenna structure 200 can be tuned by increasing the Coupling amounts (Coupling amounts) between the first and second radiating portions 130 and 140 and the first and second Coupling branches 150 and 260. The remaining features of the antenna structure 200 of fig. 2 are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C, and 1D, so that similar operation effects can be achieved in both embodiments.

Fig. 3 shows a top view of an antenna structure 300 according to an embodiment of the invention. Fig. 3 is similar to fig. 2. In the embodiment of fig. 3, a first radiating portion 330 of the antenna structure 300 includes a third coil portion 331, a third connecting portion 332, a fifth conductive penetrating member 333, a sixth conductive penetrating member 334, and a straight portion 335, wherein the third coil portion 331 and the straight portion 335 are disposed on the first surface E1 of the dielectric substrate 170, the fifth conductive penetrating member 333 and the sixth conductive penetrating member 334 penetrate through the dielectric substrate 170, and the third connecting portion 332 is disposed on the second surface E2 of the dielectric substrate 170. One end of the third coil portion 331 is coupled to the feed radiation portion 120 and the second radiation portion 140. One end of the third connection portion 332 is coupled to the other end of the third coil portion 331 via the fifth conductive through member 333, and the other end of the third connection portion 332 is coupled to the straight strip portion 335 via the sixth conductive through member 334. It should be noted that the third coil portion 331 is additionally used for the first radiating portion 330, and the perpendicular projection thereof at least partially overlaps the first coil portion 154 of the first coupling branch 150, so that the coupling amount between the first radiating portion 330 and the first coupling branch 150 can be greatly increased. The third coil portion 331 of the first radiating portion 330 not only can be used to increase the resonant path length, but also can increase the equivalent inductance value, so as to solve the problem of insufficient antenna design space. The remaining features of the antenna structure 300 of fig. 3 are similar to those of the antenna structure 200 of fig. 2, so that similar operation effects can be achieved in both embodiments.

Fig. 4A shows a top view of a coil portion according to an embodiment of the invention. Fig. 4B shows a top view of a coil portion according to an embodiment of the invention. Fig. 4C shows a top view of a coil portion according to an embodiment of the invention. It should be understood that the shape of the coil portions of the present invention can be changed according to different needs in addition to the circular coil. For example: a square coil portion, a hexagonal coil portion, or an octagonal coil portion may also be used in any of the embodiments of the present invention.

Fig. 5 shows a top view of an antenna structure 500 according to an embodiment of the invention. Fig. 5 is similar to fig. 2. In the embodiment of fig. 5, a first connection portion 551 of a first coupling leg 550 of the antenna structure 500 substantially exhibits a spiral shape, the perpendicular projection of which at least partially overlaps the first coil portion 154. Similarly, a second connection portion 561 of a second coupling leg 560 of the antenna structure 500 also substantially presents another spiral, the vertical projection of which also at least partially overlaps the second coil portion 264. It should be noted that the overall impedance matching of the antenna structure 500 can be tuned by increasing the coupling amounts and equivalent inductance values between the first radiating portion 130 and the second radiating portion 140 and the first coupling branch 550 and the second coupling branch 560. In addition, the double-layer spiral design mode can also be used for saving the whole antenna design space. The remaining features of the antenna structure 500 of fig. 5 are similar to those of the antenna structure 200 of fig. 2, so that similar operation effects can be achieved in both embodiments.

Fig. 6 shows a top view of an antenna structure 600 according to an embodiment of the invention. Fig. 6 is similar to fig. 1A. In the embodiment of fig. 6, the antenna structure 600 includes: a grounding element 110, a feeding radiation portion 120, a first radiation portion 130, a second radiation portion 140, a first coupling branch 650, a second coupling branch 660, and a dielectric substrate 170, wherein the dielectric substrate 170 has a first surface E1 and a second surface E2 opposite to each other. Generally, the feeding radiation portion 120, the first radiation portion 130, and the second radiation portion 140 are all disposed between the grounding element 110 and the first coupling branch 650 or the second coupling branch 660. It should be noted that the first coupling branch 650 and the second coupling branch 660 are both coupled to a common ground point GPC on the ground element 110. In detail, the first coupling branch 650 includes a connection portion 651, a first conductive through element 652, a second conductive through element 653, a coil portion 654, a first coupling segment 655, and a first connection segment 658, wherein the connection portion 651 is disposed on the first surface E1 of the dielectric substrate 170, the first conductive through element 652 and the second conductive through element 653 penetrate through the dielectric substrate 170, and the coil portion 654, the first coupling segment 655, the first coupling segment 658, and the second coupling branch 660 are disposed on the second surface E2 of the dielectric substrate 170. However, the present invention is not limited thereto. In other embodiments, the grounding element 110, the first coupling section 655 of the first coupling branch 650, and the second coupling branch 660 may be disposed on the first surface E1 of the dielectric substrate 170 instead, and then connected with corresponding conductive through elements (not shown).

One end of the connection portion 651 is coupled to the common ground point GPC via a first conductive through element 652, and the other end of the connection portion 651 is coupled to one end of the coil portion 654 via a second conductive through element 653. The first coupling section 655 has a first end 656 and a second end 657, wherein the first end 656 of the first coupling section 655 is coupled to the other end of the coil portion 654 via a first connecting section 658, and the second end 657 of the first coupling section 655 is an open end. In some embodiments, the second end 657 of the first coupling segment 655 does not extend beyond the second end 132 of the first radiating portion 130. A first coupling gap GC3 may be formed between the first radiating portion 130 and the first coupling segment 655 of the first coupling branch 650, and may have a width less than or equal to 2mm. The second coupling leg 660 may generally exhibit a serpentine shape. The first coupling section 655 of the first coupling branch 650 may be disposed between the first radiating portion 130 and the second coupling branch 660. The second coupling leg 660 has a first end 661 and a second end 662, wherein the first end 661 of the second coupling leg 660 is coupled to the common ground point GPC and the second end 662 of the second coupling leg 660 is an open end. In some embodiments, second end 662 of second coupling branch 660 must extend beyond second end 132 of first radiating portion 130. In detail, the second coupling leg 660 may further include a second connecting segment 668 adjacent to the first end 661 and a second coupling segment 665 adjacent to the second end 662. A second coupling gap GC4 may be formed between the first radiating portion 130 and the second coupling branch 660, and the width thereof may be less than or equal to 3mm. In other embodiments, the positions of both first coupling leg 650 and second coupling leg 660 may also be reversed. The antenna structure 600 may cover a low frequency band and a high frequency band, wherein the low frequency band may be between 600MHz and 960MHz and the high frequency band may be between 1100MHz and 6000 MHz. The addition of the coil portion 654 of the first coupling branch 650 may shift the aforementioned high frequency band in the low frequency direction based on actual measurements. The remaining features of the antenna structure 600 of fig. 6 are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C, and 1D, so that similar operation effects can be achieved in both embodiments.

Fig. 7 shows a top view of an antenna structure 700 according to an embodiment of the invention. Fig. 7 is similar to fig. 1A. In the embodiment of fig. 7, the antenna structure 700 includes: a grounding element 110, a feeding radiation portion 120, a first radiation portion 130, a second radiation portion 140, a first coupling branch 750, a second coupling branch 760, and a dielectric substrate 170, wherein the dielectric substrate 170 has a first surface E1 and a second surface E2 opposite to each other. It should be noted that the first coupling leg 750 and the second coupling leg 760 are both coupled to a common ground point GPC on the ground element 110. For example, the ground member 110 may include a ground leg 115, wherein the common ground point GPC may be located at one end of such ground leg 115. In detail, the first coupling branch 750 includes a connection portion 751, a first conductive through element 752, a second conductive through element 753, a coil portion 754, a first coupling segment 755, and a first connecting segment 758, wherein the connection portion 751 is disposed on the first surface E1 of the dielectric substrate 170, the first conductive through element 752 and the second conductive through element 753 penetrate through the dielectric substrate 170, and the coil portion 754, the first coupling segment 755, the first coupling segment 758, and the second coupling branch 760 are disposed on the second surface E2 of the dielectric substrate 170. However, the present invention is not limited thereto. In other embodiments, the grounding element 110 and the first coupling segment 755 of the first coupling branch 750 may be disposed on the first surface E1 of the dielectric substrate 170 instead, and then be connected with corresponding conductive through elements (not shown). In addition, if the grounding element 110 and the second coupling branch 760 are both disposed on the first surface E1 of the dielectric substrate 170, the first conductive through-device 752 is not required.

One end of the connection portion 751 is coupled to the common ground point GPC via the first conductive through element 752, and the other end of the connection portion 751 is coupled to one end of the coil portion 754 via the second conductive through element 753. The first coupling segment 755 has a first end 756 and a second end 757, wherein the first end 756 of the first coupling segment 755 is coupled to the other end of the coil portion 754 via the first connecting segment 758, and the second end 757 of the first coupling segment 755 is an open end. In some embodiments, the second end 757 of the first coupling section 755 must extend beyond the second end 132 of the first radiating portion 130. A first coupling gap GC5 may be formed between the first radiating portion 130 and the first coupling segment 755 of the first coupling branch 750, and may have a width less than or equal to 3mm. The second coupling leg 760 may generally exhibit an L-shape, which may be disposed between the first radiating portion 130 and the first coupling segment 755 of the first coupling leg 750. The second coupling branch 760 has a first end 761 and a second end 762, wherein the first end 761 of the second coupling branch 760 is coupled to the common ground GPC, and the second end 762 of the second coupling branch 760 is an open end. In some embodiments, second end 762 of second coupling leg 760 does not extend beyond second end 132 of first radiating portion 130. In detail, the second coupling branch 760 may further include a second connection section 768 adjacent to the first end 761 and a second coupling section 765 adjacent to the second end 762. A second coupling gap GC6 may be formed between the first radiating portion 130 and the second coupling branch 760, and the width thereof may be less than or equal to 2mm. The antenna structure 700 may cover a low frequency band and a high frequency band, wherein the low frequency band may be between 600MHz and 960MHz and the high frequency band may be between 1100MHz and 6000 MHz. The addition of the coil portion 754 of the first coupling leg 750 may shift the aforementioned low frequency band in the low frequency direction based on actual measurements. The remaining features of the antenna structure 700 of fig. 7 are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C, and 1D, so that similar operation effects can be achieved in both embodiments.

Fig. 8 shows a top view of an antenna structure 800 according to an embodiment of the invention. Fig. 8 is similar to fig. 1A. In the embodiment of fig. 8, the antenna structure 800 comprises: a grounding element 110, a feeding radiation portion 120, a first radiation portion 130, a second radiation portion 140, a first coupling branch 850, a second coupling branch 860, and a dielectric substrate 170, wherein the dielectric substrate 170 has a first surface E1 and a second surface E2 opposite to each other. It should be noted that the first coupling leg 850 and the second coupling leg 860 are both coupled to a common ground point GPC on the ground element 110. In detail, the first coupling branch 850 includes a connection portion 851, a first conductive through member 852, a second conductive through member 853, a coil portion 854, a first coupling section 855, and a first connection section 858, wherein the connection portion 851 is disposed on the first surface E1 of the dielectric substrate 170, the first conductive through member 852 and the second conductive through member 853 penetrate through the dielectric substrate 170, and the coil portion 854, the first coupling section 855, the first connection section 858, and the second coupling branch 860 are disposed on the second surface E2 of the dielectric substrate 170. However, the present invention is not limited thereto. In other embodiments, the grounding element 110, the first coupling section 855 of the first coupling branch 850, and the second coupling branch 860 may be disposed on the first surface E1 of the dielectric substrate 170 instead, and then be connected with corresponding conductive through elements (not shown).

One end of the connection portion 851 is coupled to the common ground point GPC via a first conductive through member 852, and the other end of the connection portion 851 is coupled to one end of the coil portion 854 via a second conductive through member 853. The first coupling section 855 has a first end 856 and a second end 857, wherein the first end 856 of the first coupling section 855 is coupled to the other end of the coil portion 854 via the first connecting section 858, and the second end 857 of the first coupling section 855 is an open end. In some embodiments, the second end 857 of the first coupling section 855 does not extend beyond the second end 132 of the first radiating portion 130. A first coupling gap GC7 may be formed between the first radiating portion 130 and the first coupling segment 855 of the first coupling branch 850, and may have a width less than or equal to 2mm. The second coupling branch 860 may generally exhibit an L-shape. A first coupling section 855 of the first coupling leg 850 may be disposed between the first radiating portion 130 and the second coupling leg 860. The second coupling branch 860 has a first end 861 and a second end 862, wherein the first end 861 of the second coupling branch 860 is coupled to the first coupling section 855 of the first coupling branch 850, and the second end 862 of the second coupling branch 860 is an open end. In some embodiments, the second end 862 of the second coupling leg 860 must extend beyond the second end 132 of the first radiating portion 130. In detail, the second coupling leg 860 may further include a second connecting segment 868 adjacent to the first end 861 and a second coupling segment 865 adjacent to the second end 862. A second coupling gap GC8 may be formed between the first radiating portion 130 and the second coupling branch 860, and the width thereof may be less than or equal to 3mm. The antenna structure 800 may cover a low frequency band and a high frequency band, wherein the low frequency band may be between 600MHz and 960MHz and the high frequency band may be between 1100MHz and 6000 MHz. The addition of the coil portion 854 of the first coupling branch 850 allows the aforementioned low frequency band to be shifted in the low frequency direction simultaneously with the high frequency band based on actual measurements. The remaining features of the antenna structure 800 of fig. 8 are similar to those of the antenna structure 100 of fig. 1A, 1B, 1C, and 1D, so that similar operation effects can be achieved in both embodiments.

It should be noted that the device size, device shape, and frequency range are not limitations of the present invention. The antenna designer may adjust these settings according to different needs. The antenna structure of the present invention is not limited to the state illustrated in fig. 1A to 8. The present invention may comprise only any one or more of the features of any one or more of the embodiments of fig. 1A-8. In other words, not all of the illustrated features need be implemented in the antenna structure of the present invention at the same time.

Ordinal numbers such as "first," "second," "third," and the like in the description and in the claims are used for distinguishing between two different elements having the same name and not necessarily for describing a sequential order.

While the invention has been described with reference to the preferred embodiments, it should be understood that the invention is not limited thereto, but rather, it should be apparent to one skilled in the art that various changes and modifications can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An antenna structure, the antenna structure comprising:

a grounding element;

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

a first radiation part coupled to the feed radiation part;

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

a first coupling branch coupled to a first ground point on the ground element and extending across the first radiating portion, wherein the first coupling branch includes a first coil portion and a first connecting portion; and

the dielectric substrate is provided with a first surface and a second surface which are opposite, wherein the feed-in radiation part, the first radiation part, the second radiation part and the first connection part of the first coupling branch are distributed on the first surface of the dielectric substrate, and the first coil part of the first coupling branch is distributed on the second surface of the dielectric substrate.

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

the second coupling branch is coupled to a second grounding point on the grounding element and is adjacent to the second radiation part.

3. The antenna structure of claim 1, wherein the first coupling branch further comprises:

a first conductive through element penetrating the dielectric substrate, wherein one end of the first connection portion is coupled to the first ground point via the first conductive through element;

a second conductive through element penetrating the dielectric substrate, wherein the other end of the first connection portion is coupled to one end of the first coil portion via the second conductive through element;

a first connecting section; and

the first coupling section is coupled to the other end of the first coil part through the first connecting section, wherein the first connecting section, the first coupling section and the grounding element are all arranged on the second surface of the dielectric substrate.

4. The antenna structure of claim 1, wherein the first connection portion of the first coupling branch presents a straight shape or a spiral shape.

5. The antenna structure of claim 2, wherein the second coupling branch exhibits an inverted L-shape.

6. The antenna structure of claim 2, wherein the second coupling branch further extends across the second radiating portion and includes a second coil portion.

7. The antenna structure of claim 6, wherein the second coupling branch further comprises:

the second connecting part is arranged on the first surface of the dielectric substrate;

a third conductive through element penetrating the dielectric substrate, wherein one end of the second connection portion is coupled to the second ground point through the third conductive through element;

a fourth conductive through element penetrating the dielectric substrate, wherein the other end of the second connection portion is coupled to one end of the second coil portion via the fourth conductive through element;

a second connecting section; and

and a second coupling section coupled to the other end of the second coil portion via the second connection section, wherein the second connection section, the second coupling section, and the grounding element are disposed on the second surface of the dielectric substrate.

8. The antenna structure of claim 7, wherein the second connection portion of the second coupling branch presents a straight strip shape or a spiral shape.

9. The antenna structure of claim 1, wherein the first radiating portion comprises a third coil portion.

10. The antenna structure of claim 9, wherein the first radiating portion further comprises:

a third connecting portion disposed on the second surface of the dielectric substrate;

a fifth conductive through element penetrating the dielectric substrate, wherein one end of the third connection portion is coupled to the third coil portion via the fifth conductive through element;

a straight strip portion, wherein the third coil portion and the straight strip portion are disposed on the first surface of the dielectric substrate; and

a sixth conductive through element penetrating the dielectric substrate, wherein the other end of the third connection portion is coupled to the straight bar portion via the sixth conductive through element.

11. The antenna structure of claim 1, wherein the antenna structure covers a low frequency band between 600MHz and 960MHz and a high frequency band between 1100MHz and 6000 MHz.

12. The antenna structure of claim 11, wherein a total length of the feed radiation portion and the first radiation portion is less than or equal to 0.5 times wavelength of the low frequency band.

13. The antenna structure of claim 12, wherein a total length of the feed radiation portion and the second radiation portion is less than or equal to 0.5 times wavelength of the high frequency band.

14. An antenna structure, the antenna structure comprising:

a grounding element;

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

a first radiation part coupled to the feed radiation part;

a first coupling branch including a coil portion and a first coupling section;

a second coupling branch, wherein the first coupling branch and the second coupling branch are both coupled to a common ground point on the grounding element; and

the dielectric substrate is provided with a first surface and a second surface which are opposite, wherein the feed-in radiation part, the first radiation part and the second radiation part are distributed on the first surface of the dielectric substrate, and the coil part of the first coupling branch is distributed on the second surface of the dielectric substrate;

wherein the feed-in radiation part, the first radiation part and the second radiation part are all arranged between the grounding element and the first coupling branch or the second coupling branch.

15. The antenna structure of claim 14, wherein the combination of the feed-in radiating portion, the first radiating portion, and the second radiating portion exhibits a T-shape.

16. The antenna structure of claim 14, wherein the ground element comprises a ground branch and the common ground point is located at one end of the ground branch.

17. The antenna structure of claim 14, wherein the ground element and the first coupling segment of the first coupling branch are distributed on the first surface or the second surface of the dielectric substrate.

18. The antenna structure of claim 14, wherein the first coupling branch further comprises:

a connection part arranged on the first surface of the dielectric substrate;

a first conductive through element penetrating the dielectric substrate, wherein one end of the connection portion is coupled to the common ground point through the first conductive through element;

a second conductive through element penetrating the dielectric substrate, wherein the other end of the connection portion is coupled to one end of the coil portion via the second conductive through element; and

the first coupling section is coupled to the other end of the coil part through the first coupling section, and the first coupling section, the grounding element and the first connecting section are all arranged on the second surface of the dielectric substrate.

19. The antenna structure of claim 14, wherein the second coupling branch has a serpentine shape or an L-shape and is adjacent to the first coupling branch.

20. The antenna structure of claim 14, wherein the antenna structure covers a low frequency band between 600MHz and 960MHz and a high frequency band between 1100MHz and 6000 MHz.