CN116435755A - Antenna structure - Google Patents

Abstract

An antenna structure. The antenna structure comprises a first grounding element, a second grounding element, a first radiation part, a second radiation part, a third radiation part, a fourth radiation part, a fifth radiation part and a first capacitor; the first radiation part is coupled to the feed-in point; the first capacitor is coupled between the first radiating part and the first grounding element; the second radiating part and the third radiating part are coupled to the second grounding element and are adjacent to the first radiating part; the first radiation part is arranged between the second radiation part and the third radiation part; the fourth radiating part and the fifth radiating part are coupled between the first grounding element and the second grounding element; the first radiating portion, the second radiating portion, and the third radiating portion are substantially surrounded by the first grounding element, the second grounding element, the fourth radiating portion, and the fifth radiating portion. Compared with the traditional design, the antenna structure provided by the invention has the advantages of at least small size, wide frequency band, low manufacturing cost, adaptability to different environments and the like, and 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 their 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, bluetooth systems use the 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 first grounding element; a second grounding element; a first radiation part coupled to a feed point; a first capacitor coupled between the first radiating portion and the first grounding element; the second radiating part is coupled to the second grounding element and is adjacent to the first radiating part; the third radiating part is coupled to the second grounding element and is adjacent to the first radiating part, and the first radiating part is arranged between the second radiating part and the third radiating part; a fourth radiating portion coupled between the first grounding element and the second grounding element; and a fifth radiating portion coupled between the first grounding element and the second grounding element; wherein the first radiating portion, the second radiating portion, and the third radiating portion are substantially surrounded by the first grounding element, the second grounding element, the fourth radiating portion, and the fifth radiating portion.

In some embodiments, the first radiating portion exhibits an L-shape or an unequal width shape.

In some embodiments, the first radiating portion further comprises a distal extension and the second radiating portion further comprises a distal bend.

In some embodiments, the second radiating portion exhibits an inverted L-shape.

In some embodiments, the third radiating portion exhibits a straight stripe shape.

In some embodiments, a first coupling gap is formed between the second radiating portion and the first radiating portion, a second coupling gap is formed between the third radiating portion and the first radiating portion, and a width of at least any portion of each of the first coupling gap and the second coupling gap is less than or equal to 3mm.

In some embodiments, a third coupling gap is formed between the first radiating portion and the first ground element, a fourth coupling gap is formed between the second radiating portion and the first ground element, and a width of at least any portion of each of the third coupling gap and the fourth coupling gap is less than or equal to 3mm.

In some embodiments, the fourth radiating portion includes a first section and a second section adjacent to each other, the first section being coupled to the first ground element and the second section being coupled to the second ground element.

In some embodiments, the antenna structure further comprises: a second capacitor is coupled in series between the first section and the second section.

In some embodiments, the antenna structure further comprises: and a sixth radiating portion coupled to the second section, wherein the sixth radiating portion is substantially parallel to the first grounding element and the second grounding element.

In some embodiments, the antenna structure further comprises: the first grounding element, the second grounding element, the first radiating portion, the second radiating portion, the third radiating portion, the fourth radiating portion, the fifth radiating portion and the sixth radiating portion are all disposed on the non-conductor supporting element.

In some embodiments, the fifth radiating portion includes a third section and a fourth section adjacent to each other, the third section being coupled to the first grounding element, and the fourth section being coupled to the second grounding element.

In some embodiments, the antenna structure further comprises: a third capacitor is coupled in series between the third section and the fourth section.

In some embodiments, the antenna structure further comprises: a fourth capacitor coupled between the feed point and the first radiation portion.

In some embodiments, the antenna structure further comprises: an inductor is coupled between the feed point and the second radiating portion.

In some embodiments, the antenna structure can cover a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band.

In some embodiments, the first frequency band is between 2400MHz and 2500MHz, the second frequency band is between 5000MHz and 5900MHz, the third frequency band is between 5900MHz and 6800MHz, and the fourth frequency band is between 6800MHz and 7500 MHz.

In some embodiments, the length of the first radiating portion is greater than or equal to 0.125 times the wavelength of the first frequency band.

In some embodiments, the length of the second radiating portion is greater than or equal to 0.125 times the wavelength of the first frequency band.

In some embodiments, the length of the third radiating portion is greater than or equal to 0.125 times the wavelength of the second frequency band.

The invention provides a novel antenna structure, which has the advantages of at least small size, wide frequency band, low manufacturing cost, adaptability to different environments 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.

Drawings

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

Fig. 2 shows a return loss diagram 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. 4 shows a return loss diagram of an antenna structure according to an embodiment of the invention

Fig. 5 shows a side view of a mobile device according to an embodiment of the invention.

Fig. 6 shows a side view of a mobile device according to an embodiment of the invention.

Description of main reference numerals:

100. 300 antenna structure

110. First grounding element

120. Second grounding element

130. 330 first radiating portion

131. 331 first end of the first radiation portion

132. 332 second end of the first radiating portion

140. 340 second radiation part

141. 341 a first end of a second radiation portion

142. 342 second end of the second radiating portion

150. 350 third radiating portion

151. 351 third radiating portion first end

152. 352 second end of the third radiating portion

160. Fourth radiating part

164. First section

165. Second section

170. Fifth radiating part

174. Third section

175. Fourth section

180. Non-conductor support element

199. Signal source

338. Terminal extension of the first radiating portion

348. The tail end bending part of the second radiation part

390. Sixth radiating part

391. First end of sixth radiating portion

392. A second end of the sixth radiating portion

500. 600 mobile device

510. Metal back cover

520. Metal sidewall

530. Display device

540. Conductive buffer element

641. First conductive buffer element

642. Second conductive buffer element

C1 First capacitor

C2 Second capacitor

C3 Third capacitor

C4 Fourth capacitor

FB1, FB5 first band

FB2, FB6 second frequency band

FB3, FB7 third frequency band

FB4, FB8 fourth band

FP feed point

GC coupling gap

GC1 first coupling gap

GC2 second coupling gap

GC3 third coupling gap

GC4 fourth coupling gap

GC5 fifth coupling gap

GC6 sixth coupling gap

Length of L1, L2, L3, L4

LM inductor

Width of W1, W2, W3, W4, W5

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 "below" …, "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(s) 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. 1 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. 1, the antenna structure 100 includes at least a first grounding Element (Ground Element) 110, a second grounding Element 120, a first radiating portion (Radiation Element) 130, a second radiating portion 140, a third radiating portion 150, a fourth radiating portion 160, a fifth radiating portion 170, and a first Capacitor (Capacitor) C1, wherein the first grounding Element 110, the second grounding Element 120, the first radiating portion 130, the second radiating portion 140, the third radiating portion 150, the fourth radiating portion 160, and the fifth radiating portion 170 can be made of metal materials, for example: copper, silver, aluminum, iron, or alloys thereof.

The first ground element 110 and the second ground element 120 may be disposed on upper and lower sides of the antenna structure 100, respectively, wherein the first ground element 110 and the second ground element 120 may be coupled to a system ground plane (System Ground Plane) or a metal housing (not shown), respectively.

The first radiating portion 130 may substantially take an L-shape. In detail, the first radiating portion 130 has a first End 131 and a second End 132, wherein a Feeding Point FP is located at the first End 131 of the first radiating portion 130, and the second End 132 of the first radiating portion 130 is an Open End (Open End). The feed point FP may also be coupled to a Signal Source 199, such as: a Radio Frequency (RF) module may be used to excite the antenna structure 100. In addition, the first capacitor C1 is coupled between a turn portion of the first radiating portion 130 and the first grounding element 110.

The second radiation portion 140 may substantially have an inverted L shape. In detail, 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 grounding element 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. In some embodiments, the second radiation portion 140 is adjacent to the first radiation portion 130, wherein a first Coupling Gap (GC 1) is formed between the second radiation portion 140 and the first radiation portion 130. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a case where the corresponding two elements are spaced less than a predetermined distance (for example, 5mm or less), but generally does not include a case where the corresponding two elements are in direct contact with each other (i.e., the aforementioned spacing is shortened to 0).

The third radiation portion 150 may substantially take the shape of a straight bar, wherein the first radiation portion 130 may be disposed between the second radiation portion 140 and the third radiation portion 150. In detail, the third radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the third radiating portion 150 is coupled to the second grounding element 120, and the second end 152 of the third radiating portion 150 is an open end and extends in a direction approaching the first radiating portion 130. In some embodiments, the third radiation portion 150 is adjacent to the first radiation portion 130, wherein a second coupling gap GC2 is formed between the third radiation portion 150 and the first radiation portion 130.

In some embodiments, the first radiating portion 130 and the second radiating portion 140 are adjacent to the first grounding element 110, wherein a third coupling gap GC3 is formed between the first radiating portion 130 and the first grounding element 110, and a fourth coupling gap GC4 is formed between the second radiating portion 140 and the first grounding element 110.

The fourth radiating portion 160 is coupled between the first grounding element 110 and the second grounding element 120. In detail, the fourth radiating portion 160 includes a first section 164 and a second section 165 adjacent to each other, wherein the first section 164 is coupled to the first grounding element 110, and the second section 165 is coupled to the second grounding element 120. In some embodiments, a fifth coupling gap GC5 is formed between the first section 164 and the second section 165.

The fifth radiating portion 170 is coupled between the first grounding element 110 and the second grounding element 120, wherein the fifth radiating portion 170 and the fourth radiating portion 160 may be substantially parallel to each other. In detail, the fifth radiating portion 170 includes a third section 174 and a fourth section 175 adjacent to each other, wherein the third section 174 is coupled to the first grounding element 110, and the fourth section 175 is coupled to the second grounding element 120. In some embodiments, a sixth coupling gap GC6 is formed between the third section 174 and the fourth section 175. It should be noted that the first radiating portion 130, the second radiating portion 140, the third radiating portion 150, and the first capacitor C1 are substantially surrounded by the first grounding element 110, the second grounding element 120, the fourth radiating portion 160, and the fifth radiating portion 170.

In some embodiments, the antenna structure 100 further includes a non-conductive supporting element (Nonconductive Support Element) 180, wherein the first grounding element 110, the second grounding element 120, the first radiating portion 130, the second radiating portion 140, the third radiating portion 150, the fourth radiating portion 160, the fifth radiating portion 170, and the first capacitor C1 are disposed on the non-conductive supporting element 180. The shape and kind of the non-conductor support member 180 are not particularly limited in the present invention. In other embodiments, the non-conductive support element 180 may be replaced by a printed circuit board (Printed Circuit Board, PCB) or a flexible circuit board (Flexible Printed Circuit, FPC).

Fig. 2 shows a Return Loss (Return Loss) diagram of the antenna structure 100 according to an embodiment of the present invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the Return Loss (dB). According to the measurement result of fig. 2, the antenna structure 100 may cover at least a first Frequency Band (Frequency Band) FB1, a second Frequency Band FB2, a third Frequency Band FB3, and a fourth Frequency Band FB4. For example, the first frequency band FB1 may be between 2400MHz and 2500MHz, the second frequency band FB2 may be between 5000MHz and 5900MHz, the third frequency band FB3 may be between 5900MHz and 6800MHz, and the fourth frequency band FB4 may be between 6800MHz and 7500 MHz. Thus, the antenna structure 100 may support at least wideband operation for legacy WLAN (Wireless Local Area Network) and new generation Wi-Fi 6E.

In some embodiments, the principle of operation of the antenna structure 100 may be as follows. The second radiation portion 140 can be excited by the first radiation portion 130 and used together with the fourth radiation portion 160 and the fifth radiation portion 170 to form the aforementioned first frequency band FB1, wherein the first radiation portion 130, the second radiation portion 140, the fourth radiation portion 160, and the fifth radiation portion 170 can be used to adjust the impedance matching (Impedance Matching) and the resonant frequency offset (Resonant Frequency Shift) of the first frequency band FB 1. The third radiating portion 150 may be excited by coupling of the first radiating portion 130 to form the aforementioned second frequency band FB2. In addition, the first radiating portion 130 and the second radiating portion 140 may further excite some Higher-order resonant modes (Higher-order Resonant Modes) to form the aforementioned third frequency band FB3 and fourth frequency band FB4. According to the actual measurement result, the addition of the first capacitor C1 helps to improve the impedance matching of the second frequency band FB2, the third frequency band FB3, and the fourth frequency band FB4 at the same time, so that the operation bandwidth (Operational Bandwidth) thereof can be increased.

In some embodiments, the element dimensions and element parameters of the antenna structure 100 may be as follows. The length L1 of the first radiating portion 130 may be greater than or equal to 0.125 times wavelength (λ/8) of the first frequency band FB1 of the antenna structure 100. The length L2 of the second radiating portion 140 may be greater than or equal to 0.125 times wavelength (λ/8) of the first frequency band FB1 of the antenna structure 100. The length L3 of the third radiating portion 150 may be greater than or equal to 0.125 times wavelength (λ/8) of the second frequency band FB2 of the antenna structure 100. The width W1 of the first radiating portion 130, the width W2 of the second radiating portion 140, the width W3 of the third radiating portion 150, the width W4 of the fourth radiating portion 160, and the width W5 of the fifth radiating portion 170 may be greater than or equal to 1mm. The width of each of the first, second, third, fourth, fifth, and sixth coupling gaps GC1, GC2, GC3, GC4, GC5, and GC6 may be less than or equal to 3mm. In some embodiments, the coupling gaps GC1-GC6 can exhibit an unequal width shape (e.g., a zig-zag or a W-shape), wherein at least any portion of the coupling gaps GC1-GC6 can have a width of less than or equal to 3mm. The Capacitance value (Capacitance) of the first capacitor C1 may be between 2pF and 6.8pF, for example: about 3.3pF. The above dimensions and parameter ranges are determined according to a plurality of experimental results, which are helpful for improving the operation bandwidth and impedance matching of the antenna structure 100.

The following embodiments describe other variations of the antenna structure 100 that may also perform similar functions. 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. 3 shows a top view of an antenna structure 300 according to an embodiment of the invention. Fig. 3 is similar to fig. 1. In the embodiment of fig. 3, the antenna structure 300 further includes a sixth radiating portion 390, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and an Inductor (Inductor) LM, which may be disposed on the non-conductor support element 180. In addition, the designs of a first radiating portion 330, a second radiating portion 340, and a third radiating portion 350 of the antenna structure 300 are slightly adjusted.

In the fourth radiating portion 160, the second capacitor C2 is coupled in series between the first section 164 and the second section 165 thereof, which may replace the fifth coupling gap GC5 described above. In the fifth radiating portion 170, a third capacitor C3 is coupled in series between the third section 174 and the fourth section 175 thereof, which may replace the aforementioned sixth coupling gap GC6. The sixth radiating portion 390 may generally take the shape of a straight bar, which may be generally parallel to the first and second ground elements 110 and 120. In detail, the sixth radiating portion 390 has a first end 391 and a second end 392, wherein the first end 391 of the sixth radiating portion 390 is coupled to the second section 165 of the fourth radiating portion 160, and the second end 392 of the sixth radiating portion 390 is an open end and extends in a direction approaching the second radiating portion 340.

The first radiation portion 330 may substantially take on an unequal width shape. In detail, the first radiating portion 330 has a first end 331 and a second end 332, wherein the fourth capacitor C4 is coupled between the feeding point FP and the first end 331 of the first radiating portion 330. In some embodiments, the first radiating portion 330 further includes an end extension (Terminal Extension Portion) 338 adjacent to the second end 332 of the first radiating portion 330. For example, the end extension 338 of the first radiating portion 330 may have an inverted triangle shape and may extend in a direction toward the second grounding element 120.

The second radiation portion 340 may substantially take an inverted L shape. In detail, the second radiating portion 340 has a first end 341 and a second end 342, wherein the first end 341 of the second radiating portion 340 is coupled to the second grounding element 120, and the inductor LM is coupled between the feeding point FP and the first end 341 of the second radiating portion 340. In some embodiments, the second radiating portion 340 further includes an end bend portion (Terminal Bend Portion) 348 adjacent to the second end 342 of the second radiating portion 340.

The third radiation portion 350 may have a substantially trapezoid shape. In detail, the third radiating portion 350 has a first end 351 and a second end 352, wherein the first end 351 of the third radiating portion 350 is coupled to the second grounding element 120, and the second end 352 of the third radiating portion 350 is an open end and extends in a direction approaching the end extension 338 of the first radiating portion 330. In some embodiments, a coupling gap GC may be formed between the third radiating portion 350 and the first radiating portion 330 and the end extension 338 thereof, and the width thereof may be less than or equal to 3mm. In other embodiments, the coupling gap GC may have an unequal width shape (e.g., a zig-zag shape or a W-shape), wherein at least any portion of the coupling gap GC may have a width of less than or equal to 3mm.

Fig. 4 shows a return loss diagram of an antenna structure 300 according to an embodiment of the invention, wherein the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). According to the measurement result of fig. 4, the antenna structure 300 can cover at least a first frequency band FB5, a second frequency band FB6, a third frequency band FB7, and a fourth frequency band FB8. For example, the first frequency band FB5 may be between 2400MHz and 2500MHz, the second frequency band FB6 may be between 5000MHz and 5900MHz, the third frequency band FB7 may be between 5900MHz and 6800MHz, and the fourth frequency band FB8 may be between 6800MHz and 7500 MHz. Thus, the antenna structure 300 may also support wideband operation for legacy WLAN and new generation Wi-Fi 6E.

In some embodiments, the element dimensions and element parameters of the antenna structure 300 may be as follows. The length L4 of the sixth radiating portion 390 may be greater than or equal to 0.125 times the wavelength (λ/8) of the fourth frequency band FB8 of the antenna structure 300. The capacitance value of the second capacitor C2 may be between 0.1pF and 1pF, for example: about 0.4pF. The capacitance value of the third capacitor C3 may be between 0.1pF and 1pF, for example: about 0.4pF. The capacitance value of the fourth capacitor C4 may be between 2pF and 6pF, for example: about 3.6pF. The Inductance value (Inductance) of the inductor LM may be between 4nH and 10nH, for example: about 6.2nH. It should be noted that the foregoing design may help to further optimize the operating bandwidth and impedance matching of the antenna structure 300 based on actual measurements. The remaining features of the antenna structure 300 of fig. 3 are similar to those of the antenna structure 100 of fig. 1, so that similar operation effects can be achieved in both embodiments.

Fig. 5 shows a side view of a mobile device 500 according to an embodiment of the invention. In the embodiment of fig. 5, the mobile Device 500 includes a Metal Back Cover (Metal Back Cover) 510, a Metal Sidewall (Metal Sidewall) 520, a Display Device 530, a conductive buffer element (Conductive Buffer Element) 540, and the antenna structure 100. The metal sidewall 520 is coupled to the metal back cover 510 and may be substantially perpendicular to the metal back cover 510. The antenna structure 100 may be disposed between the metal sidewall 520 and the display 530. For example, the conductive buffer element 540 may be a pad or a conductive foam, which may be located at the bottom of the nonconductive support element 180. In addition, the first and second ground elements 110 and 120 may be coupled to the conductive buffer element 540 and the metal back cover 510, respectively. According to practical measurement results, the antenna structure 100 can be well integrated with the rest of the elements of the mobile device 500, so that the antenna structure 100 can provide good radiation characteristics even if it is adjacent to an environment with a metal housing. In other embodiments, the first and second grounding elements 110 and 120 may further extend and be connected to each other at the bottom of the non-conductor support element 180, which are then coupled to the metal back cover 510 via the conductive buffer element 540.

Fig. 6 shows a side view of a mobile device 600 according to an embodiment of the invention. Fig. 6 is similar to fig. 5. In the embodiment of fig. 6, the mobile device 600 further includes a first conductive buffer element 641 and a first conductive buffer element 642 (instead of the conductive buffer element 540 described above), which may be located at two sides of the non-conductive support element 180, respectively. In addition, the first grounding element 110 may be coupled to the metal back cover 510 via the first conductive buffer element 641, and the second grounding element 120 may be coupled to the metal back cover 510 via the second conductive buffer element 642. The metal sidewall 520 is only an optional element, and may be removed from the mobile device 600 in other embodiments. The remaining features of the mobile device 600 of fig. 6 are similar to those of the mobile device 500 of fig. 5, so that similar operational effects can be achieved in both embodiments.

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 manufacturing cost, adaptability to different environments and the like, so that the invention is very suitable for being applied to various mobile communication devices.

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. 1 to 6. The present invention may comprise only any one or more of the features of any one or more of the embodiments of fig. 1-6. 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 (20)

1. An antenna structure, the antenna structure comprising:

a first grounding element;

a second grounding element;

a first radiation part coupled to a feed point;

a first capacitor coupled between the first radiating portion and the first grounding element;

a second radiating portion coupled to the second grounding element and adjacent to the first radiating portion;

a third radiating portion coupled to the second grounding element and adjacent to the first radiating portion, wherein the first radiating portion is disposed between the second radiating portion and the third radiating portion;

a fourth radiating portion coupled between the first grounding element and the second grounding element; and

a fifth radiating portion coupled between the first grounding element and the second grounding element;

wherein the first radiating portion, the second radiating portion, and the third radiating portion are substantially surrounded by the first grounding element, the second grounding element, the fourth radiating portion, and the fifth radiating portion.

2. The antenna structure of claim 1, wherein the first radiating portion has an L-shape or an unequal width.

3. The antenna structure of claim 1, wherein the first radiating portion further comprises an end extension and the second radiating portion further comprises an end bend.

4. The antenna structure of claim 1, wherein the second radiating portion has an inverted L-shape.

5. The antenna structure of claim 1, wherein the third radiating portion has a straight strip shape.

6. The antenna structure of claim 1, wherein a first coupling gap is formed between the second radiating portion and the first radiating portion, a second coupling gap is formed between the third radiating portion and the first radiating portion, and a width of at least any portion of each of the first coupling gap and the second coupling gap is less than or equal to 3mm.

7. The antenna structure of claim 1, wherein a third coupling gap is formed between the first radiating portion and the first ground element, a fourth coupling gap is formed between the second radiating portion and the first ground element, and a width of at least any portion of each of the third coupling gap and the fourth coupling gap is less than or equal to 3mm.

8. The antenna structure of claim 1, wherein the fourth radiating portion comprises a first section and a second section adjacent to each other, the first section being coupled to the first ground element and the second section being coupled to the second ground element.

9. The antenna structure of claim 8, further comprising:

and a second capacitor coupled in series between the first section and the second section.

10. The antenna structure of claim 8, further comprising:

and a sixth radiating portion coupled to the second section, wherein the sixth radiating portion is substantially parallel to the first grounding element and the second grounding element.

11. The antenna structure of claim 10, further comprising:

the first grounding element, the second grounding element, the first radiating portion, the second radiating portion, the third radiating portion, the fourth radiating portion, the fifth radiating portion and the sixth radiating portion are all disposed on the non-conductive supporting element.

12. The antenna structure of claim 1, wherein the fifth radiating portion comprises a third section and a fourth section adjacent to each other, the third section being coupled to the first ground element and the fourth section being coupled to the second ground element.

13. The antenna structure of claim 12, further comprising:

and a third capacitor coupled in series between the third section and the fourth section.

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

a fourth capacitor coupled between the feed point and the first radiating portion.

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

an inductor is coupled between the feed point and the second radiating portion.

16. The antenna structure of claim 1, wherein the antenna structure is capable of covering a first frequency band, a second frequency band, a third frequency band, and a fourth frequency band.

17. The antenna structure of claim 16, wherein the first frequency band is between 2400MHz and 2500MHz, the second frequency band is between 5000MHz and 5900MHz, the third frequency band is between 5900MHz and 6800MHz, and the fourth frequency band is between 6800MHz and 7500 MHz.

18. The antenna structure of claim 16, wherein the length of the first radiating portion is greater than or equal to 0.125 times the wavelength of the first frequency band.

19. The antenna structure of claim 16, wherein the length of the second radiating portion is greater than or equal to 0.125 times the wavelength of the first frequency band.

20. The antenna structure of claim 16, wherein the length of the third radiating portion is greater than or equal to 0.125 times the wavelength of the second frequency band.

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