Antenna structure

Abstract

An antenna structure. The antenna structure comprises a feed radiation part, a first radiation part, a second radiation part, a short circuit part, a first tuner, and a second tuner; the feed radiation part has a feed point; the first radiation part is coupled to the feed radiation part; the first radiation part is coupled to a ground potential via the first tuner; the feed radiation part is coupled to the ground potential via the short circuit part; the second radiation part is adjacent to the first radiation part and separated from the first radiation part; the second radiation part is coupled to the ground potential via the second tuner; the feed radiation part is disposed between the first tuner and the short circuit part. The present application proposes a novel antenna structure, which comprises two tuners. Compared with the conventional design, the antenna structure of the present application has at least the advantages of adjustable impedance value, small size, wide frequency band, and low manufacturing cost, and is very suitable for application in various mobile communication devices.

Description

Technical Field

[0001] This invention relates to an antenna structure, and more particularly to a wideband antenna structure. Background Technology

[0002] With the advancement of mobile communication technology, mobile devices have become increasingly common in recent years, such as laptops, mobile phones, multimedia players, and other portable electronic devices with multiple functions. To meet people's needs, mobile devices typically have wireless communication capabilities. Some cover long-range wireless communication, such as mobile phones using 2G, 3G, and LTE (Long Term Evolution) systems and their respective frequency bands of 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz. Others cover short-range wireless communication, such as Wi-Fi and Bluetooth systems using the 2.4GHz, 5.2GHz, and 5.8GHz frequency bands.

[0003] Antennas are indispensable components in wireless communication. If the bandwidth of an antenna used for receiving or transmitting signals is insufficient, it can easily lead to a degradation in the communication quality of mobile devices. Therefore, designing small-sized, wide-bandwidth antenna components is an important task for antenna designers.

[0004] Therefore, an antenna structure is needed to solve the above problems. Summary of the Invention

[0005] In a preferred embodiment, the present invention provides an antenna structure comprising: a feed radiating section having a feed point; a first radiating section coupled to the feed radiating section; a first tuner, wherein the first radiating section is coupled to a ground potential via the first tuner; a short-circuit section, wherein the feed radiating section is coupled to the ground potential via the short-circuit section; a second radiating section adjacent to and separate from the first radiating section; and a second tuner, wherein the second radiating section is coupled to the ground potential via the second tuner; wherein the feed radiating section is disposed between the first tuner and the short-circuit section.

[0006] In some embodiments, the feed radiation portion is a shorter straight strip, the first radiation portion is a longer straight strip, and the first radiation portion is substantially perpendicular to the feed radiation portion.

[0007] In some embodiments, the short-circuit portion is L-shaped.

[0008] In some embodiments, the second radiating portion is in the form of a straight strip.

[0009] 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 0.5 mm and 2 mm.

[0010] In some embodiments, the antenna structure covers a first frequency band, which is between 600 MHz and 960 MHz.

[0011] In some embodiments, the total length of the feed radiator and the first radiator is between 0.25 and 0.5 times the wavelength of the first frequency band.

[0012] In some embodiments, the length of the second radiating portion is between 0.125 and 0.25 times the wavelength of the first frequency band.

[0013] In some embodiments, the first tuner is coupled to a first connection point on the first radiating section, and the path length from the feed point to the first connection point is between 0.125 times and 0.25 times the wavelength of the first frequency band.

[0014] In some embodiments, the first tuner includes a first variable capacitor and a first switch connected in series.

[0015] In some embodiments, the capacitance value of the first variable capacitor is between 0.7pF and 8pF, and the first switch selectively turns the capacitor on or off.

[0016] In some embodiments, the second tuner includes a second variable capacitor and a second switch connected in series.

[0017] In some embodiments, the capacitance value of the second variable capacitor is between 0.7pF and 8pF, and the second switch selectively turns the capacitor on or off.

[0018] In some embodiments, the antenna structure further includes a third radiating portion coupled to the feed radiating portion, wherein the third radiating portion extends in substantially opposite directions to the first radiating portion.

[0019] In some embodiments, the antenna structure further includes a fourth radiating portion coupled to the ground potential, wherein the fourth radiating portion is adjacent to the feed point.

[0020] In some embodiments, the antenna structure further includes a fifth radiating portion coupled to the short-circuit portion, wherein the fifth radiating portion is disposed between the third radiating portion and the short-circuit portion.

[0021] In some embodiments, the antenna structure further includes a second frequency band, a third frequency band, and a fourth frequency band, wherein the second frequency band is between 1575MHz and 2690MHz, the third frequency band is between 3200MHz and 4200MHz, and the fourth frequency band is between 5150MHz and 5925MHz.

[0022] In some embodiments, the total length of the feed radiator and the third radiator is between 0.25 and 0.5 times the wavelength of the second frequency band.

[0023] In some embodiments, the length of the fourth radiating portion is between 0.5 and 1 wavelength of the third frequency band.

[0024] In some embodiments, the distance between the fourth radiating element and the feed point is between 0.125 and 0.25 times the wavelength of the third frequency band.

[0025] This invention proposes a novel antenna structure comprising two tuners. Compared to conventional designs, this invention offers advantages such as adjustable impedance, small size, wide bandwidth, and low manufacturing cost, making it well-suited for use in a wide variety of mobile communication devices. Attached Figure Description

[0026] Figure 1 This diagram shows an antenna structure according to an embodiment of the present invention.

[0027] Figure 2 This diagram shows an antenna structure according to an embodiment of the present invention.

[0028] Figure 3 This diagram shows the return loss of an antenna structure according to an embodiment of the present invention.

[0029] Figure 4 This diagram shows an antenna structure according to an embodiment of the present invention.

[0030] Figure 5 This diagram shows the return loss of an antenna structure according to an embodiment of the present invention.

[0031] Explanation of key component symbols:

[0032] 100, 200, 400 antenna structures

[0033] 110 Feed radiator

[0034] 111 First end of the feed radiator

[0035] 112 The second end of the feed radiator

[0036] 120 First Radiation Department

[0037] 121 First end of the first radiating section

[0038] 122 The second end of the first radiating section

[0039] 130, 230 First Tuner

[0040] 140 Short Circuit Section

[0041] 141 The first end of the short-circuit section

[0042] 142 The second end of the short-circuit section

[0043] 150 Second Radiation Section

[0044] 151 The first end of the second radiating section

[0045] 152 The second end of the second radiating section

[0046] 160, 260 Second Tuner

[0047] 199 signal source

[0048] 235 First Switcher

[0049] 265 Second Switcher

[0050] 470 Third Radiation Department

[0051] 471 The first end of the third radiating section

[0052] 472 The second end of the third radiating section

[0053] 480 Fourth Radiation Department

[0054] 481 The first end of the fourth radiating section

[0055] 482 The second end of the fourth radiating section

[0056] 490 Fifth Radiation Department

[0057] 491 The first end of the fifth radiating section

[0058] 492 The second end of the fifth radiating section

[0059] C1 First variable capacitor

[0060] C2 Second Variable Capacitor

[0061] CC1 First Curve

[0062] CC2 Second Curve

[0063] CC8 Eighth Curve

[0064] CC9 Ninth Curve

[0065] CP1 First Connection Point

[0066] CP2 Second Connection Point

[0067] CP3 Third Connection Point

[0068] D1 Spacing

[0069] FB1 First Band

[0070] FB2 Second Band

[0071] FB3 Third Band

[0072] FB4 Fourth Band

[0073] FP feed point

[0074] GC1 coupling gap

[0075] Lengths of L1, L2, L3, L4, L5, and L6

[0076] N1 First Node

[0077] N2 Second Node

[0078] VSS ground potential

[0079] Widths of W1, W2, W3, W4, W5, W6 Detailed Implementation

[0080] To make the objectives, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below in conjunction with the accompanying drawings.

[0081] Certain terms are used in the specification and claims to refer to specific elements. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same element. This specification and claims do not distinguish elements by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The term "generally" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and achieve the basic technical effect within a certain margin of error. Furthermore, the term "coupled" in this specification includes any direct and indirect electrical connection means. Therefore, if a first device is described as coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device via other devices or connection means.

[0082] The following disclosure provides many different embodiments or examples to implement the various features of this invention. The following disclosure describes specific examples of the various components and their arrangements for simplification. Of course, these specific examples are not intended to be limiting. For example, if this specification describes a first feature formed on or above a second feature, it indicates that it may include embodiments where the first and second features are in direct contact, or embodiments where additional features are formed between the first and second features, so that the first and second features may not be in direct contact. Furthermore, the same reference numerals and / or designations may be repeated in different examples of the following specification. These repetitions are for simplification and clarity and are not intended to limit any specific relationship between the different embodiments or / and structures discussed.

[0083] Furthermore, spatially related terms, such as "below," "below," "lower," "above," "higher," and similar terms, are used to facilitate the description of the relationship between one element or feature and another(s) in the illustration. In addition to the orientation shown in the accompanying drawings, these spatially related terms are intended to encompass different orientations of the device in use or operation. The device may be rotated to different orientations (90 degrees or other orientations), and the spatially related terms used herein can be interpreted in the same way.

[0084] Figure 1 This diagram illustrates an antenna structure 100 according to an embodiment of the present invention. The antenna structure 100 can be applied to a mobile device, such as a smartphone, a tablet computer, or a notebook computer. Figure 1 In one embodiment, the antenna structure 100 includes at least a feeding radiation element 110, a first radiation element 120, a first tuner 130, a shorting element 140, a second radiation element 150, and a second tuner 160. The feeding radiation element 110, the first radiation element 120, the shorting element 140, and the second radiation element 150 can all be made of metal, such as copper, silver, aluminum, iron, or alloys thereof.

[0085] The feed radiator 110 can generally be a short, straight strip. Specifically, the feed radiator 110 has a first end 111 and a second end 112, wherein a feeding point FP is located at the first end 111 of the feed radiator 110. The feeding point FP can also be coupled to a signal source 199, such as a radio frequency (RF) module, which can be used to excite the antenna structure 100.

[0086] The first radiating portion 120 may generally be a long, straight strip, and may be generally perpendicular to the feed radiating portion 110. Specifically, the first radiating portion 120 has a first end 121 and a second end 122, wherein the first end 121 of the first radiating portion 120 is coupled to the second end 112 of the feed radiating portion 110, and the second end 122 of the first radiating portion 120 is an open end. However, the invention is not limited thereto. In other embodiments, the included angle between the first radiating portion 120 and the feed radiating 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.

[0087] The first tuner 130 provides a first adjustable impedance value. The first tuner 130 is coupled to a first connection point CP1 on the first radiator 120. Additionally, the first radiator 120 can be coupled to a ground potential VSS via the first tuner 130. For example, the ground potential VSS can be provided by a ground copper foil, which can also be coupled to a system ground plane (not shown). It should be noted that the feed-in radiator 110 is located between the first tuner 130 and the short-circuit section 140. For example, the first tuner 130 can be located to the right of the feed-in radiator 110, and the short-circuit section 140 can be located to the left of the feed-in radiator 110, but this is not a limitation.

[0088] The short-circuit section 140 can be generally L-shaped. Specifically, the short-circuit section 140 has a first end 141 and a second end 142, wherein the first end 141 of the short-circuit section 140 is coupled to the ground potential VSS, and the second end 142 of the short-circuit section 140 is coupled to a second connection point CP2 on the feed-in radiating section 110. That is, the feed-in radiating section 110 can be coupled to the ground potential VSS via the short-circuit section 140.

[0089] The second radiating portion 150 may be generally straight. The second radiating portion 150 is adjacent to the first radiating portion 120 and may be completely separated from it. It should be noted that the terms "adjacent" or "adjacent" in this specification may refer to a distance between two corresponding elements that is less than a predetermined distance (e.g., 5 mm or less), but generally does not include cases where the corresponding elements are in direct contact with each other (i.e., the aforementioned distance is reduced to 0). Specifically, the second radiating portion 150 has a first end 151 and a second end 152, wherein the second end 152 of the second radiating portion 150 is an open-circuit 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 generally opposite and mutually distant directions. In some embodiments, the second radiating portion 150 and the first radiating portion 120 are generally parallel to each other, wherein a coupling gap GC1 may be formed between the second radiating portion 150 and the first radiating portion 120.

[0090] In other embodiments, the specific shape of each of the feed radiator 110, the first radiator 120, the short-circuit section 140, and the second radiator 150 can be adjusted according to different needs. For example, any of the feed radiator 110, the first radiator 120, the short-circuit section 140, and the second radiator 150 can be changed to a straight strip of unequal width, an L-shape, a T-shape, a U-shape, or a meandering shape, but is not limited to these.

[0091] The second tuner 160 provides a second adjustable impedance value. The second tuner 160 is coupled to a first terminal 151 of the second radiator 150. Additionally, the second radiator 150 can be coupled to ground potential VSS via the second tuner 160. It must be understood that by using the first tuner 130 and the second tuner 160 for impedance adjustment, the antenna structure 100 can still cover the required wideband operation without increasing the design area.

[0092] In some embodiments, the antenna structure 100 may be formed on a dielectric substrate (not shown). For example, the aforementioned 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 may be formed on any supporting element (not shown) by laser-directed structuring (LDS).

[0093] Figure 2This diagram shows an antenna structure 200 according to an embodiment of the present invention. Figure 2 and Figure 1 Similar. Figure 2 In one embodiment, a first tuner 230 of the antenna structure 200 includes a first variable capacitor C1 and a first switch element 235 connected in series, while a second tuner 260 of the antenna structure 200 includes a second variable capacitor C2 and a second switch element 265 connected in series. Specifically, 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 a first connection point CP1, and the second terminal of the first variable capacitor C1 is coupled to a first node N1. The first switch element 235 has a first terminal and a second terminal, wherein the first terminal of the first switch element 235 is coupled to the first node N1, and the second terminal of the first switch element 235 is coupled to a ground potential VSS. The first switch element 235 can 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 section 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 ground potential VSS. The second switch 265 can 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 can all be operated according to a control signal from a processor (not shown). Figure 2 The remaining features of the antenna structure 200 are all the same as Figure 1 Since the antenna structures are similar to those of the 100, both embodiments can achieve similar operational effects.

[0094] Figure 3 This diagram shows the return loss of an antenna structure 100 (or 200) according to an embodiment of the present invention, where the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). Figure 3As shown, a first curve CC1, a second curve CC2, ..., an eighth curve CC8, and a ninth curve CC9 correspond to different impedance values ​​provided by the first tuner 230 and the second tuner 260. For example, if both the first switch 235 and the second switch 265 are on and both the first variable capacitor C1 and the second variable capacitor C2 provide their maximum capacitance values, the operating characteristics of the antenna structure 100 (or 200) will be as described by the first curve CC1. If both the first switch 235 and the second switch 265 are on and both the first variable capacitor C1 and the second variable capacitor C2 provide their minimum capacitance values, the operating characteristics of the antenna structure 100 (or 200) will be as described by the eighth curve CC8. Furthermore, if both the first switch 235 and the second switch 265 are off, the operating characteristics of the antenna structure 100 (or 200) will be as described by the ninth curve CC9. Figure 3 Based on the measurement results, antenna structure 100 (or 200) can at least cover a first frequency band FB1, wherein the first frequency band FB1 can be between 600MHz and 960MHz. However, the invention is not limited thereto. In other embodiments, the first frequency band FB1 can also be between 400MHz and 960MHz to include a relatively lower frequency range.

[0095] In some embodiments, the operating principle of antenna structure 100 (or 200) may be as described below. The second radiating section 150 may be coupled and excited by the feed radiating section 110 and the first radiating section 120 to form the aforementioned first frequency band FB1. The short-circuit section 140 can be used to fine-tune the impedance matching of the first frequency band FB1. Furthermore, the first tuner 130 and the second tuner 160 can be used to significantly increase the operating bandwidth of antenna structure 100.

[0096] In some embodiments, the component dimensions of the antenna structure 100 (or 200) may be as described below. The total length L1 of the feed radiator 110 and the first radiator 120 may be between 0.25 and 0.5 times the wavelength of the first frequency band FB1 of the antenna structure 100 (λ / 4 to λ / 2). The width W1 of the first radiator 120 may be between 1 mm and 5 mm. The length L2 of the second radiator 150 may be between 0.125 and 0.25 times the wavelength of the first frequency band FB1 of the antenna structure 100 (λ / 8 to λ / 4). The width W2 of the second radiator 150 may be between 1 mm 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 times the wavelength of the first frequency band FB1 of the antenna structure 100 (λ / 8 to λ / 4). The width W3 of the short-circuit portion 140 may be between 1 mm and 5 mm. The width of the coupling gap GC1 can be between 0.5 mm and 2 mm. The capacitance value of the first variable capacitor C1 can be between 0.7 pF and 8 pF. The capacitance value of the second variable capacitor C2 can be between 0.7 pF and 8 pF. The above size ranges are derived from multiple experimental results and help optimize the operating bandwidth and impedance matching of antenna structure 100 (or 200).

[0097] The following embodiments will illustrate other variations of the antenna structure 100, which can also achieve similar effects. It must be understood that these figures and descriptions are merely examples and are not intended to limit the scope of the invention.

[0098] Figure 4 This diagram shows an antenna structure 400 according to an embodiment of the present invention. Figure 4 and Figure 1 Similar. Figure 4 In one embodiment, the antenna structure 400 further includes a third radiating part 470, a fourth radiating part 480, and a fifth radiating part 490, all of which can be made of metal.

[0099] The third radiating section 470 may be generally straight and may be generally perpendicular to the feed radiating section 110. Specifically, the third radiating section 470 has a first end 471 and a second end 472, wherein the first end 471 of the third radiating section 470 is coupled to the second end 112 of the feed radiating section 110, and the second end 472 of the third radiating section 470 is an open-circuit end. For example, the second end 472 of the third radiating section 470 and the second end 122 of the first radiating section 120 may extend in generally opposite and mutually distant directions. In some embodiments, a combination of the feed radiating section 110, the first radiating section 120, and the third radiating section 470 generally forms a T-shape.

[0100] The fourth radiating section 480 may generally be in a narrow L-shape, with the fourth radiating section 480 adjacent to the feed point FP. Specifically, the fourth radiating section 480 has a first end 481 and a second end 482, wherein the first end 481 of the fourth radiating section 480 is coupled to ground potential VSS, while the second end 482 of the fourth radiating section 480 is an open-circuit end. For example, the second end 482 of the fourth radiating section 480 and the second end 472 of the third radiating section 470 may extend in generally the same direction.

[0101] The fifth radiating section 490 may generally present another narrower L-shape, wherein the fifth radiating section 490 is disposed between the third radiating section 470 and the short-circuit section 140. Specifically, the fifth radiating section 490 has a first end 491 and a second end 492, wherein the first end 491 of the fifth radiating section 490 is coupled to a third connection point CP3 on the short-circuit section 140, while the second end 492 of the fifth radiating section 490 is an open-circuit end. For example, the second end 492 of the fifth radiating section 490 and the second end 472 of the third radiating section 470 may extend in generally the same direction. Figure 4 The remaining features of the antenna structure 400 are all the same as Figure 1 Since the antenna structures are similar to those of the 100, both embodiments can achieve similar operational effects.

[0102] Figure 5 This diagram shows the return loss of an antenna structure 400 according to an embodiment of the present invention, where the horizontal axis represents the operating frequency (MHz) and the vertical axis represents the return loss (dB). Figure 5 Based on the measurement results, 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 5925MHz. Therefore, the antenna structure 400 will be able to support at least sub-6GHz wideband operation in next-generation 5G communications.

[0103] In some embodiments, the operating principle of the antenna structure 400 may be as follows. The feed radiator 110 and the third radiator 470 can jointly generate the aforementioned second frequency band FB2. The fourth radiator 480 can generate the aforementioned third frequency band FB3. The feed radiator 110, the short-circuit section 140, and the fifth radiator 490 can jointly generate the aforementioned fourth frequency band FB4. In other words, the addition of the third radiator 470, the fourth radiator 480, and the fifth radiator 490 helps to increase the high-frequency bandwidth of the antenna structure 400.

[0104] In some embodiments, the component dimensions of the antenna structure 400 may be as described below. The total length L4 of the feed radiator 110 and the third radiator 470 may be between 0.25 and 0.5 times the wavelength of the second frequency band FB2 of the antenna structure 400 (λ / 4 to λ / 2). The width W4 of the third radiator 470 may be between 1 mm and 5 mm. The length L5 of the fourth radiator 480 may be between 0.5 and 1 times the wavelength of the third frequency band FB3 of the antenna structure 400 (λ / 2 to 1λ). The width W5 of the fourth radiator 480 may be between 1 mm and 4 mm. The distance D1 between the fourth radiator 480 and the feed point FP may be between 0.125 and 0.25 times the wavelength of the third frequency band FB3 of the antenna structure 400 (λ / 8 to λ / 4). 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 section 490 can be between 0.25 and 0.5 times the wavelength of the fourth frequency band FB4 of the antenna structure 400 (λ / 4 to λ / 2). The width W6 of the fifth radiating section 490 can be between 1 mm and 4 mm. These dimensional ranges were determined based on the results of multiple experiments and help optimize the operating bandwidth and impedance matching of the antenna structure 400.

[0105] This invention proposes a novel antenna structure comprising two tuners. Compared to conventional designs, this invention offers advantages such as adjustable impedance, small size, wide bandwidth, and low manufacturing cost, making it well-suited for use in a wide variety of mobile communication devices.

[0106] It is worth noting that the component dimensions, shapes, and frequency ranges described above are not limiting factors of this invention. Antenna designers can adjust these settings according to different needs. The antenna structure of this invention is not limited to... Figure 1-5 The state illustrated. This invention may include only... Figure 1-5 Any one or more features of any one or more embodiments of the present invention. In other words, not all of the illustrated features need to be implemented in the antenna structure of the present invention simultaneously.

[0107] The ordinal numbers in this specification and claims, such as "first," "second," "third," etc., are not sequential in any particular order; they are only used to distinguish between two different elements with the same name.

[0108] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art should be able to make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the scope of the appended claims.

Claims

1. An antenna structure comprising: A feed radiator having a feed point; A first radiating section, the first radiating section being coupled to the feed radiating section; A first tuner, wherein the first radiating portion is coupled to a ground potential via the first tuner; A short-circuit section, wherein the feed-in radiating section is coupled to the ground potential via the short-circuit section; A second radiating part is adjacent to the first radiating part and separate from the first radiating part; as well as A second tuner, wherein the second radiating portion is coupled to the ground potential via the second tuner; The feed-in radiating section is disposed between the first tuner and the short-circuit section; The antenna structure also includes: A third radiating section is coupled to the feed radiating section, wherein the third radiating section extends in substantially opposite directions to the first radiating section; as well as A fifth radiating section is coupled to the short-circuit section, wherein the fifth radiating section is disposed between the third radiating section and the short-circuit section.

2. The antenna structure as claimed in claim 1, wherein the feed radiating section is a shorter straight strip, the first radiating section is a longer straight strip, and the first radiating section is substantially perpendicular to the feed radiating section.

3. The antenna structure as claimed in claim 1, wherein the short-circuit portion is L-shaped.

4. The antenna structure as claimed in claim 1, wherein the second radiating part is in the form of a straight strip.

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

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

7. The antenna structure as claimed in claim 6, wherein the total length of the feed radiating section and the first radiating section is between 0.25 times and 0.5 times the wavelength of the first frequency band.

8. The antenna structure of claim 6, wherein the length of the second radiating part is between 0.125 times and 0.25 times the wavelength 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 section, and the path length from the feed point to the first connection point is between 0.125 times and 0.25 times the wavelength of the first frequency band.

10. The antenna structure of claim 1, wherein the first tuner includes a first variable capacitor and a first switch connected in series.

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

12. The antenna structure of claim 1, wherein the second tuner includes a second variable capacitor and a second switch connected in series.

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

14. The antenna structure as described in claim 1, further comprising: A fourth radiating element is coupled to the ground potential, wherein the fourth radiating element is adjacent to the feed point.

15. The antenna structure of claim 14, wherein the antenna structure further comprises a second frequency band, a third frequency band, and a fourth frequency band, the second frequency band being between 1575 MHz and 2690 MHz, the third frequency band being between 3200 MHz and 4200 MHz, and the fourth frequency band being between 5150 MHz and 5925 MHz.

16. The antenna structure of claim 15, wherein the total length of the feed radiating section and the third radiating section is between 0.25 times and 0.5 times the wavelength of the second frequency band.

17. The antenna structure of claim 15, wherein the length of the fourth radiating part is between 0.5 times and 1 times the wavelength of the third frequency band.

18. The antenna structure of claim 15, wherein the distance between the fourth radiating element and the feed point is between 0.125 times and 0.25 times the wavelength of the third frequency band.

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