CN115706316A - Antenna structure - Google Patents

Abstract

An antenna structure. The antenna structure includes: a feed-in radiation part, a first radiation part, a second radiation part, a short-circuit part, a first tuner and a second tuner; the feed-in radiation part is provided with a feed-in point; the first radiation part is coupled to the feed radiation part; the first radiation part is coupled to the ground potential through the first tuner; the feed radiation part is coupled to the grounding potential through the short circuit part; the second radiation part is adjacent to the first radiation part and is separated from the first radiation part; the second radiation part is coupled to the ground potential through the second tuner; the feed-in radiation part is arranged between the first tuner and the short-circuit part. Compared with the traditional design, the antenna structure at least has the advantages of adjustable impedance value, small size, wide frequency band, low manufacturing cost 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 Wideband (Wideband) antenna structure.

Background

With the development of mobile communication technology, mobile devices have become increasingly popular in recent years, such as: portable computers, mobile phones, multimedia players and other portable electronic devices with mixed functions. To meet the demand of people, mobile devices usually have wireless communication functions. Some cover long-range wireless communication ranges, such as: the mobile phone uses 2G, 3G, LTE (Long Term Evolution) system and its used frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz to perform communication, and some mobile phones cover short-distance wireless communication ranges, for example: wi-Fi and Bluetooth systems use frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz for communication.

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

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

Disclosure of Invention

In a preferred embodiment, the present invention provides an antenna structure, which includes: a feed-in radiation part, which is provided with a feed-in point; a first radiation part coupled to the feed radiation part; a first tuner, wherein the first radiating portion is coupled to a ground potential via the first tuner; a short circuit portion, wherein the feed radiation portion is coupled to the ground potential via the short circuit portion; a second radiation part adjacent to the first radiation part and separated from the first radiation part; and a second tuner, wherein the second radiating portion is coupled to the ground potential via the second tuner; the feed-in radiation part is arranged between the first tuner and the short circuit part.

In some embodiments, the feeding radiation part presents a shorter straight strip shape, the first radiation part presents a longer straight strip shape, and the first radiation part is approximately vertical to the feeding radiation part.

In some embodiments, the short presents an L-shape.

In some embodiments, the second radiating portion has a straight strip shape.

In some embodiments, a coupling gap is formed between the second radiating portion and the first radiating portion, and the width of the coupling gap is between 0.5mm and 2 mm.

In some embodiments, the antenna structure covers a first frequency band between 600MHz and 960 MHz.

In some embodiments, a total length of the feeding radiating portion and the first radiating portion is between 0.25 times and 0.5 times a wavelength of the first frequency band.

In some embodiments, the length of the second radiation portion is between 0.125 and 0.25 wavelengths of the first frequency band.

In some embodiments, the first tuner is coupled to a first connection point on the first radiating portion, and a path length from the feed point to the first connection point is between 0.125 and 0.25 wavelengths of the first frequency band.

In some embodiments, the first tuner comprises a first variable capacitor and a first switch coupled in series.

In some embodiments, the first variable capacitor has a capacitance between 0.7pF and 8pF, and the first switch is selectively turned on or off.

In some embodiments, the second tuner comprises a second variable capacitor and a second switch coupled in series.

In some embodiments, the second variable capacitor has a capacitance between 0.7pF and 8pF, and the second switch is selectively turned on or off.

In some embodiments, the antenna structure further comprises: a third radiation part coupled to the feed radiation part, wherein the third radiation part and the first radiation part extend in opposite directions.

In some embodiments, the antenna structure further comprises: a fourth radiation portion coupled to the ground potential, wherein the fourth radiation portion is adjacent to the feeding point.

In some embodiments, the antenna structure further comprises: a fifth radiation part coupled to the short circuit part, wherein the fifth radiation part is disposed between the third radiation part and the short circuit part.

In some embodiments, the antenna structure further covers a second frequency band between 1575MHz to 2690MHz, a third frequency band between 3200MHz to 4200MHz, and a fourth frequency band between 5150MHz to 5925 MHz.

In some embodiments, a total length of the feeding radiating portion and the third radiating portion is between 0.25 times and 0.5 times a wavelength of the second frequency band.

In some embodiments, the length of the fourth radiating portion is between 0.5 and 1 wavelength of the third frequency band.

In some embodiments, the distance between the fourth radiation portion and the feeding point is between 0.125 and 0.25 wavelengths of the third frequency band.

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

Drawings

Fig. 1 is a schematic diagram of an antenna structure according to an embodiment of the invention.

Fig. 2 is a schematic diagram of an antenna structure according to an embodiment of the invention.

Fig. 3 shows a return loss diagram of an antenna structure according to an embodiment of the invention.

Fig. 4 is a schematic diagram of an antenna structure according to an embodiment of the invention.

Fig. 5 shows a return loss diagram of an antenna structure according to an embodiment of the invention.

Description of the main component symbols:

100. 200, 400 antenna structure

110. Feed-in radiation part

111. First end of feed-in radiation part

112. Second end of the feed-in radiation part

120. A first radiation part

121. First end of the first radiation part

122. Second end of the first radiation part

130. 230 first tuner

140. Short-circuit part

141. First end of the short-circuit part

142. Second end of the short circuit part

150. Second radiation part

151. First end of the second radiation part

152. Second end of the second radiation part

160. 260 second tuner

199. Signal source

235. First switch

265. Second switch

470. Third radiation part

471. First end of the third radiation part

472. Second end of the third radiation part

480. A fourth radiation part

481. First end of the fourth radiation part

482. Second end of the fourth radiation part

490. Fifth radiation part

491. First end of fifth radiation part

492. Second end of the fifth radiation part

C1 First variable capacitor

C2 Second variable capacitor

First curve of CC1

Second curve of CC2

Eighth curve of CC8

Ninth curve of CC9

CP1 first connection point

CP2 second connection point

CP3 third connection point

D1 Distance between

FB1 first frequency band

FB2 second frequency band

FB3 third frequency band

FB4 fourth frequency band

FP feed-in point

GC1 coupling gap

L1, L2, L3, L4, L5, L6 Length

N1 first node

N2 second node

VSS ground potential

Widths W1, W2, W3, W4, W5, W6

Detailed Description

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

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

The following disclosure provides many different embodiments, or examples, for implementing different features of the disclosure. The following disclosure describes specific examples of components and arrangements thereof to simplify the description. Of course, these specific examples are not intended to be limiting. For example, if the specification states a first feature formed over or on a second feature, that is, embodiments that may include the first feature in direct contact with the second feature, embodiments may include additional features formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the same reference signs or (and) signs may be repeated for different examples in the following description. These iterations are for simplicity and clarity and are not intended to limit the particular relationship between the various embodiments or (and) structures discussed.

Furthermore, words are used in relation to space. Such as "under 82303023", "below", "lower", "over", "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 drawings. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be oriented in different orientations (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Fig. 1 is a diagram illustrating an antenna structure 100 according to an embodiment of the invention. The antenna structure 100 may be used in a Mobile Device (Mobile Device), such as: a Smart Phone (Smart Phone), a Tablet Computer (Tablet Computer), or a Notebook Computer (Notebook Computer). In the embodiment of fig. 1, the antenna structure 100 at least includes a Feeding Radiation Element (Radiation Element) 110, a first Radiation Element (Radiation Element) 120, a first Tuner (Tuner) 130, a short circuit Element (short Element) 140, a second Radiation Element 150, and a second Tuner 160, wherein the Feeding Radiation Element 110, the first Radiation Element 120, the short circuit Element 140, and the second Radiation Element 150 are all made of metal materials, for example: copper, silver, aluminum, iron, or alloys thereof.

The feeding radiating portion 110 may have a substantially short straight strip shape. In detail, the Feeding radiation portion 110 has a first end 111 and a second end 112, wherein a Feeding Point (Feeding Point) FP is located at the first end 111 of the Feeding radiation portion 110. The feed point FP may also be coupled to a Signal Source (Signal Source) 199, such as: a Radio Frequency (RF) module may be used to excite the antenna structure 100.

The first radiating portion 120 may substantially have a long straight strip shape, wherein the first radiating portion 120 may be substantially perpendicular to the feeding radiating portion 110. In detail, the first radiation portion 120 has a first End 121 and a second End 122, wherein the first End 121 of the first radiation portion 120 is coupled to the second End 112 of the feeding radiation portion 110, and the second End 122 of the first radiation portion 120 is an Open End (Open End). However, the present invention is not limited thereto. In other embodiments, an included angle between the first radiation portion 120 and the feeding radiation portion 110 may be between 45 degrees and 135 degrees, for example: about 70 degrees, about 80 degrees, about 90 degrees, about 100 degrees, or about 110 degrees.

The first tuner 130 may provide a first adjustable Impedance Value (Tunable Impedance Value). The first tuner 130 is coupled to a first Connection Point (Connection Point) CP1 on the first radiation part 120. In addition, the first radiation portion 120 may be coupled to a ground potential VSS through the first tuner 130. For example, the Ground potential VSS may be provided by a Ground Copper Foil (Ground Copper Foil), which may also be coupled to a System Ground Plane (not shown). It should be noted that the feeding radiating part 110 is disposed between the first tuner 130 and the short circuit part 140. For example, the first tuner 130 may be located at the right side of the feeding radiating portion 110, and the short circuit portion 140 may be located at the left side of the feeding radiating portion 110, but the invention is not limited thereto.

The short circuit portion 140 may substantially have an L-shape. In detail, the short circuit portion 140 has a first end 141 and a second end 142, wherein the first end 141 of the short circuit portion 140 is coupled to the ground potential VSS, and the second end 142 of the short circuit portion 140 is coupled to a second connection point CP2 on the feeding radiation portion 110. That is, the feed radiating portion 110 may be coupled to the ground potential VSS via the short circuit portion 140.

The second radiation portion 150 may substantially have a straight bar shape. The second radiation part 150 is adjacent to the first radiation part 120 and may be completely separated from the first radiation part 120. It should be noted that the term "adjacent" or "adjacent" in this specification may refer to a distance between two corresponding elements that is less than a predetermined distance (e.g., 5mm or less), but generally does not include the case where two corresponding elements are in direct contact with each other (i.e., the distance is reduced to 0). In detail, the second radiation portion 150 has a first end 151 and a second end 152, wherein the second end 152 of the second radiation portion 150 is an open end. For example, the second end 152 of the second radiating portion 150 and the second end 122 of the first radiating portion 120 may extend in opposite directions away from each other. In some embodiments, the second radiation portion 150 and the first radiation portion 120 are substantially parallel to each other, wherein a Coupling Gap (Coupling Gap) GC1 may be formed between the second radiation portion 150 and the first radiation portion 120.

In other embodiments, the specific shape of each of the feeding radiating portion 110, the first radiating portion 120, the short-circuit portion 140, and the second radiating portion 150 can be adjusted according to different requirements. For example, any one of the feeding radiating portion 110, the first radiating portion 120, the short-circuiting portion 140, and the second radiating portion 150 may be modified to have a non-uniform width, a straight strip shape, an L-shape, a T-shape, a U-shape, or a meandering shape, but is not limited thereto.

The second tuner 160 may provide a second adjustable impedance value. The second tuner 160 is coupled to the first end 151 of the second radiation part 150. In addition, the second radiation portion 150 may be coupled to the ground potential VSS via the second tuner 160. It should be understood that, by adjusting the impedance through the first tuner 130 and the second tuner 160, the antenna structure 100 can still cover the desired wide frequency operation without increasing the design area.

In some embodiments, the antenna structure 100 may be formed on a Dielectric Substrate (not shown). For example, the dielectric substrate may be a Printed Circuit Board (PCB) or a Flexible Printed Circuit (FPC). The antenna structure 100 may be a planar structure, but the invention is not limited thereto. In other embodiments, the antenna structure 100 may be a three-dimensional structure and formed on any supporting element (not shown) by Laser Direct Structuring (LDS).

Fig. 2 is a diagram of an antenna structure 200 according to an embodiment of the invention. Fig. 2 is similar to fig. 1. In the embodiment of fig. 2, a first tuner 230 of the antenna structure 200 includes a first Variable Capacitor (Variable Capacitor) C1 and a first Switch (Switch Element) 235 coupled in series, and a second tuner 260 of the antenna structure 200 includes a second Variable Capacitor C2 and a second Switch 265 coupled in series. In detail, the first variable capacitor C1 has a first terminal and a second terminal, wherein the first terminal of the first variable capacitor C1 is coupled to the first connection point CP1, and the second terminal of the first variable capacitor C1 is coupled to a first node N1. The first switch 235 has a first terminal and a second terminal, wherein the first terminal of the first switch 235 is coupled to the first node N1, and the second terminal of the first switch 235 is coupled to the ground potential VSS. The first switch 235 may be selectively turned on or off. The second variable capacitor C2 has a first terminal and a second terminal, wherein the first terminal of the second variable capacitor C2 is coupled to the first terminal 151 of the second radiating part 150, and the second terminal of the second variable capacitor C2 is coupled to a second node N2. The second switch 265 has a first terminal and a second terminal, wherein the first terminal of the second switch 265 is coupled to the second node N2, and the second terminal of the second switch 265 is coupled to the ground potential VSS. The second switch 265 may be selectively turned on or off. In some embodiments, the first variable capacitor C1, the second variable capacitor C2, the first switch 235, and the second switch 265 are all operable according to a control signal from a Processor (not shown). The remaining features of the antenna structure 200 of fig. 2 are similar to those of the antenna structure 100 of fig. 1, so that similar operation can be achieved in both embodiments.

Fig. 3 shows a Return Loss (Return Loss) diagram of the antenna structure 100 (or 200) 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). As shown in fig. 3, a first curve CC1, a second curve CC2, \8230, an eighth curve CC8, and a ninth curve CC9 may correspond to different impedance values provided by the first tuner 230 and the second tuner 260. For example, if the first switch 235 and the second switch 265 are both turned on and the first variable capacitor C1 and the second variable capacitor C2 both provide their maximum capacitance values, the operating characteristics of the antenna structure 100 (or 200) will be as described in the first curve CC 1. If the first switch 235 and the second switch 265 are both turned on and the first variable capacitor C1 and the second variable capacitor C2 both provide their minimum capacitance values, the operating characteristics of the antenna structure 100 (or 200) will be as described in the eighth curve CC 8. In addition, if the first switch 235 and the second switch 265 are both open, the operation characteristics of the antenna structure 100 (or 200) will be as described by the ninth curve CC 9. According to the measurement results shown in fig. 3, the antenna structure 100 (or 200) can at least cover a first Frequency Band (Frequency Band) FB1, wherein the first Frequency Band FB1 can be between 600MHz and 960 MHz. However, the present invention is not limited thereto. In other embodiments, the first frequency band FB1 may also be between 400MHz and 960MHz to include a relatively lower frequency range.

In some embodiments, the principles of operation of the antenna structure 100 (or 200) may be as follows. The second radiation portion 150 can be coupled and excited by the feeding radiation portion 110 and the first radiation portion 120 to form the first frequency band FB1. The short-circuit unit 140 is used to fine-tune Impedance Matching (Impedance Matching) of the first frequency band FB1. In addition, the first tuner 130 and the second tuner 160 can be used to greatly increase an operating Bandwidth (Operation Bandwidth) of the antenna structure 100.

In some embodiments, the element dimensions of the antenna structure 100 (or 200) may be as follows. The total length L1 of the feeding radiating part 110 and the first radiating part 120 may be between 0.25 times and 0.5 times the wavelength (λ/4 λ/2) of the first frequency band FB1 of the antenna structure 100. The width W1 of the first radiation part 120 may be between 1mm and 5 mm. The length L2 of the second radiation portion 150 may be between 0.125 and 0.25 wavelengths (λ/8- λ/4) of the first frequency band FB1 of the antenna structure 100. The width W2 of the second radiation portion 150 may be between 1mm and 5 mm. The path length L3 from the feed point FP to the first connection point CP1 may be between 0.125 and 0.25 wavelengths (λ/8- λ/4) of the first frequency band FB1 of the antenna structure 100. The width W3 of the short circuit portion 140 may be between 1mm and 5 mm. The width of the coupling gap GC1 may be between 0.5mm and 2 mm. The capacitance value of the first variable capacitor C1 may be between 0.7pF and 8 pF. The capacitance value of the second variable capacitor C2 may be between 0.7pF and 8 pF. The above size ranges are found from a number of experimental results, which help optimize the operating bandwidth and impedance matching of the antenna structure 100 (or 200).

The following embodiments will describe other variations of the antenna structure 100, which may also perform similar functions. It must be understood that these drawings and descriptions are only exemplary and are not intended to limit the scope of the present invention.

Fig. 4 is a diagram illustrating an antenna structure 400 according to an embodiment of the invention. Fig. 4 is similar to fig. 1. In the embodiment of fig. 4, the antenna structure 400 further includes a third radiation portion 470, a fourth radiation portion 480, and a fifth radiation portion 490, which are all made of metal material.

The third radiation part 470 may substantially have a straight bar shape, which may be substantially perpendicular to the feeding radiation part 110. In detail, the third radiation portion 470 has a first end 471 and a second end 472, wherein the first end 471 of the third radiation portion 470 is coupled to the second end 112 of the feeding radiation portion 110, and the second end 472 of the third radiation portion 470 is an open end. For example, the second end 472 of the third radiation portion 470 and the second end 122 of the first radiation portion 120 may extend in opposite directions away from each other. In some embodiments, a combination of the feeding radiating portion 110, the first radiating portion 120, and the third radiating portion 470 substantially presents a T-shape.

The fourth radiating portion 480 may substantially have a thin L shape, wherein the fourth radiating portion 480 is adjacent to the feeding point FP. In detail, the fourth radiation portion 480 has a first end 481 and a second end 482, wherein the first end 481 of the fourth radiation portion 480 is coupled to the ground potential VSS, and the second end 482 of the fourth radiation portion 480 is an open end. For example, the second end 482 of the fourth radiating portion 480 and the second end 472 of the third radiating portion 470 may extend in substantially the same direction.

The fifth radiation portion 490 may substantially take another thin L-shape, wherein the fifth radiation portion 490 is disposed between the third radiation portion 470 and the short circuit portion 140. In detail, the fifth radiation portion 490 has a first end 491 and a second end 492, wherein the first end 491 of the fifth radiation portion 490 is coupled to a third connection point CP3 on the short-circuit portion 140, and the second end 492 of the fifth radiation portion 490 is an open end. For example, the second end 492 of the fifth radiating portion 490 and the second end 472 of the third radiating portion 470 may extend in substantially the same direction. The remaining features of the antenna structure 400 of fig. 4 are similar to those of the antenna structure 100 of fig. 1, so that similar operation can be achieved in both embodiments.

Fig. 5 shows a Return Loss (Return Loss) diagram of an antenna structure 400 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 results of fig. 5, the antenna structure 400 can also cover a second frequency band FB2, a third frequency band FB3, and a fourth frequency band FB4. For example, the second frequency band FB2 can be between 1575MHz and 2690MHz, the third frequency band FB3 can be between 3200MHz and 4200MHz, and the fourth frequency band FB4 can be between 5150MHz and 5925 MHz. Thus, the antenna structure 400 will at least support sub-6GHz broadband operation in new generation 5G communications.

In some embodiments, the principles of operation of the antenna structure 400 may be as follows. The feeding radiation part 110 and the third radiation part 470 can jointly excite to generate the aforementioned second frequency band FB2. The fourth radiation portion 480 may excite and generate the third frequency band FB3. The feeding radiating portion 110, the short-circuit portion 140, and the fifth radiating portion 490 can jointly excite and generate the fourth frequency band FB4. In other words, the addition of the third radiation portion 470, the fourth radiation portion 480, and the fifth radiation portion 490 helps to increase the high frequency bandwidth of the antenna structure 400.

In some embodiments, the element dimensions of the antenna structure 400 may be as follows. The total length L4 of the feeding radiating part 110 and the third radiating part 470 can be between 0.25 times and 0.5 times the wavelength (λ/4- λ/2) of the second frequency band FB2 of the antenna structure 400. The width W4 of the third radiation portion 470 may be between 1mm and 5 mm. The length L5 of the fourth radiating portion 480 may be between 0.5 times and 1 times the wavelength (λ/2-1 λ) of the third frequency band FB3 of the antenna structure 400. The width W5 of the fourth radiating portion 480 may be between 1mm and 4 mm. The distance D1 between the fourth radiating portion 480 and the feeding point FP may be between 0.125 and 0.25 wavelengths (λ/8- λ/4) of the third frequency band FB3 of the antenna structure 400. The path length L6 from the feed point FP through the second connection point CP2 and the third connection point CP3 to the second end 492 of the fifth radiating portion 490 may be between 0.25 times and 0.5 times the wavelength of the fourth frequency band FB4 of the antenna structure 400 (λ/4- λ/2). The width W6 of the fifth radiation portion 490 may be between 1mm and 4 mm. The above size ranges are derived from multiple experimental results, which help optimize the operating bandwidth and impedance matching of the antenna structure 400.

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

It is noted that the sizes, shapes and frequency ranges of the above-mentioned components are not limitations of the present invention. The antenna designer can adjust these settings according to different needs. The antenna structure of the present invention is not limited to the states illustrated in fig. 1-5. The present invention may include only any one or more features of any one or more of the embodiments of figures 1-5. In other words, not all illustrated features may be implemented in the antenna structure of the present invention at the same time.

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

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

Claims (20)

1. An antenna structure, comprising:

a feed-in radiation part, which has a feed-in point;

a first radiation part coupled to the feed radiation part;

a first tuner, wherein the first radiating portion is coupled to a ground potential via the first tuner;

a short circuit portion, wherein the feed radiation portion is coupled to the ground potential via the short circuit portion;

a second radiation part adjacent to the first radiation part and separated from the first radiation part; and

a second tuner, wherein the second radiating portion is coupled to the ground potential via the second tuner;

the feed-in radiation part is arranged between the first tuner and the short circuit part.

2. The antenna structure according to claim 1, wherein the feeding radiating portion has a shorter straight strip shape, the first radiating portion has a longer straight strip shape, and the first radiating portion is substantially perpendicular to the feeding radiating portion.

3. The antenna structure of claim 1 wherein the short circuit portion has an L-shape.

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

5. The antenna structure of claim 1, wherein a coupling gap is formed between the second radiating portion and the first radiating portion, and a width of the coupling gap is between 0.5mm and 2 mm.

6. The antenna structure of claim 1, wherein the antenna structure covers a first frequency band between 600MHz and 960 MHz.

7. The antenna structure of claim 6, wherein a total length of the feeding radiating portion and the first radiating portion is between 0.25 times and 0.5 times a wavelength of the first frequency band.

8. The antenna structure according to claim 6, wherein the length of the second radiation portion is between 0.125 and 0.25 wavelengths of the first frequency band.

9. The antenna structure of claim 6, wherein the first tuner is coupled to a first connection point on the first radiating portion, and a path length from the feed point to the first connection point is between 0.125 and 0.25 wavelengths of the first frequency band.

10. The antenna structure of claim 1 wherein the first tuner comprises a first variable capacitor and a first switch coupled in series.

11. The antenna structure of claim 10 wherein the first variable capacitor has a capacitance between 0.7pF and 8pF and the first switch is selectively turned on or off.

12. The antenna structure of claim 1 wherein the second tuner comprises a second variable capacitor and a second switch coupled in series.

13. The antenna structure of claim 12 wherein the second variable capacitor has a capacitance between 0.7pF and 8pF, and the second switch is selectively turned on or off.

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

a third radiation part coupled to the feed radiation part, wherein the third radiation part and the first radiation part extend in opposite directions.

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

a fourth radiation portion coupled to the ground potential, wherein the fourth radiation portion is adjacent to the feeding point.

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

a fifth radiation part coupled to the short circuit part, wherein the fifth radiation part is disposed between the third radiation part and the short circuit part.

17. The antenna structure of claim 16, wherein the antenna structure further covers a second frequency band between 1575MHz to 2690MHz, a third frequency band between 3200MHz to 4200MHz, and a fourth frequency band between 5150MHz to 5925 MHz.

18. The antenna structure of claim 17, wherein a total length of the feeding radiating portion and the third radiating portion is between 0.25 times and 0.5 times a wavelength of the second frequency band.

19. The antenna structure of claim 17, wherein the length of the fourth radiating portion is between 0.5 and 1 wavelengths of the third frequency band.

20. The antenna structure of claim 17, wherein the fourth radiating portion is spaced from the feeding point by 0.125-0.25 wavelength of the third frequency band.

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