Antenna structure

Abstract

An antenna structure. The antenna structure comprises a first radiating portion, a second radiating portion, a third radiating portion, a connecting metal portion, an adjustable capacitor, a first capacitor, a second capacitor, and a first inductor; the first radiating portion is coupled to a signal source via the first capacitor; the second radiating portion is coupled to the first radiating portion; the second radiating portion is also coupled to a ground potential via the second capacitor; the third radiating portion is coupled to the first radiating portion; the connecting metal portion is coupled to the first radiating portion or the second radiating portion via the first inductor; the adjustable capacitor generates a variable capacitance value according to a first control signal, wherein the connecting metal portion is also coupled to the ground potential via the adjustable capacitor. The antenna structure of the present invention has at least the advantages of small size, wide frequency band, and can be additionally combined with a proximity sensor, and is therefore very suitable for use in various mobile communication devices.

Description

Technical Field

[0001] This invention relates to an antenna structure, and more particularly to a broadband 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 ranges; for example, mobile phones use 2G, 3G, and LTE (Long Term Evolution) systems and the frequency bands they use: 700MHz, 850MHz, 900MHz, 1800MHz, 1900MHz, 2100MHz, 2300MHz, and 2500MHz. Others cover short-range wireless communication ranges; for example, Wi-Fi and Bluetooth systems use the frequency bands of 2.4GHz, 5.2GHz, and 5.8GHz.

[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. Summary of the Invention

[0004] In a preferred embodiment, the present invention provides an antenna structure comprising: a first radiating portion; a first capacitor, wherein the first radiating portion is coupled to a signal source via the first capacitor; a second radiating portion coupled to the first radiating portion; a second capacitor, wherein the second radiating portion is also coupled to a ground potential via the second capacitor; a third radiating portion coupled to the first radiating portion; a connecting metal portion; a first inductor, wherein the connecting metal portion is coupled to the first radiating portion or the second radiating portion via the first inductor; and an adjustable capacitor, which generates a variable capacitance value according to a first control signal, wherein the connecting metal portion is also coupled to a ground potential via the adjustable capacitor.

[0005] In some embodiments, the antenna structure further includes: a proximity sensor; a second inductor coupled between the connecting metal portion and the proximity sensor; and a third inductor, wherein the connecting metal portion is also coupled to a ground potential via the third inductor.

[0006] In some embodiments, the first radiating portion and the third radiating portion serve as a sensing plate of a proximity sensor.

[0007] In some embodiments, a coupling gap is formed between the connecting metal portion and the third radiating portion, and the width of the coupling gap is between 3 mm and 8 mm.

[0008] In some embodiments, the antenna structure covers a first frequency band, a second frequency band, and a third frequency band.

[0009] In some embodiments, the antenna structure further includes a fourth radiating portion coupled to a ground potential, wherein the fourth radiating portion is adjacent to the third radiating portion and the connecting metal portion.

[0010] In some embodiments, the antenna structure further includes: an adjustable circuit that generates a variable impedance value according to a second control signal, wherein the fourth radiating element is also coupled to a ground potential via the adjustable circuit.

[0011] In some embodiments, the adjustable circuit includes: a short-circuit path coupled to ground potential; a capacitive path coupled to ground potential; a first inductive path coupled to ground potential; a second inductive path coupled to ground potential; an open-circuit path coupled to ground potential; and a switch coupled to a fourth radiating section, wherein the switch switches between the short-circuit path, the capacitive path, the first inductive path, the second inductive path, and the open-circuit path according to a second control signal.

[0012] In some embodiments, a first coupling gap is formed between the third radiating portion and the fourth radiating portion, and a second coupling gap is formed between the connecting metal portion and the fourth radiating portion. The width of the first coupling gap is between 1 mm and 4 mm, and the width of the second coupling gap is between 0.5 mm and 8 mm.

[0013] In some embodiments, the first frequency band is between 617 MHz and 960 MHz, the second frequency band is between 1400 MHz and 2690 MHz, and the third frequency band is between 3300 MHz and 5925 MHz.

[0014] In some embodiments, the total length of the first radiating portion and the second radiating portion is between 0.125 and 0.25 times the wavelength of the third frequency band.

[0015] In some embodiments, the total length of the first radiating portion and the third radiating portion is between 0.125 and 0.25 times the wavelength of the first frequency band.

[0016] In some embodiments, the length of the connecting metal portion is between 0.0625 and 0.25 times the wavelength of the first frequency band.

[0017] In some embodiments, the length of the fourth radiating portion is between 0.0625 and 0.125 times the wavelength of the first frequency band.

[0018] In some embodiments, the antenna structure further includes: a fifth radiating portion coupled to the first radiating portion; a sixth radiating portion coupled to the first radiating portion, wherein the sixth radiating portion is at least partially surrounded by the fifth radiating portion; and a seventh radiating portion coupled to the third radiating portion.

[0019] In some embodiments, the capacitance values ​​of both the first capacitor and the second capacitor are between 22pF and 77pF.

[0020] In some embodiments, the inductance value of the first inductor is between 12nH and 63nH.

[0021] In some embodiments, the inductance value of the second inductor is between 210nH and 450nH.

[0022] In some embodiments, the inductance value of the third inductor is between 57nH and 270nH.

[0023] In another preferred embodiment, the present invention provides an antenna structure comprising: a first radiating portion coupled to a signal source; a second radiating portion coupled to the first radiating portion; a third radiating portion coupled to the first radiating portion, wherein the second and third radiating portions extend in substantially opposite directions; a fourth radiating portion coupled to a ground potential, wherein the fourth radiating portion is adjacent to the third radiating portion; a connecting metal portion; a first inductor, wherein the connecting metal portion is coupled to the first radiating portion via the first inductor; and an adjustable capacitor for generating a variable capacitance value according to a first control signal, wherein the connecting metal portion is also coupled to the ground potential via the adjustable capacitor.

[0024] This invention proposes a novel antenna structure. Compared with conventional designs, this invention has advantages such as small size, wide bandwidth, and the ability to incorporate proximity sensors, making it well-suited for use in a wide variety of mobile communication devices. Attached Figure Description

[0025] Figure 1 This diagram shows an antenna structure according to an embodiment of the present invention.

[0026] Figure 2 This diagram shows an antenna structure according to an embodiment of the present invention.

[0027] Figure 3 This diagram shows the structure of an adjustable circuit according to an embodiment of the present invention.

[0028] Figure 4 This diagram shows an antenna structure according to an embodiment of the present invention.

[0029] Figure 5 This diagram shows an antenna structure according to another embodiment of the present invention.

[0030] Explanation of key component symbols:

[0031] 100, 200, 400, 500 antenna structures

[0032] 110, 410, 510 First Radiation Section

[0033] 111, 511 First end of the first radiating section

[0034] 112, 512 The second end of the first radiating section

[0035] 120, 420, 520 Second Radiation Section

[0036] 121, 521 The first end of the second radiating section

[0037] 122, 522 The second end of the second radiating section

[0038] 130, 430, 530 Third Radiation Section

[0039] 131, 531 The first end of the third radiating section

[0040] 132, 532 The second end of the third radiating section

[0041] 140, 540 connecting metal parts

[0042] 141, 541 First end of connecting metal part

[0043] 142, 542 The second end of the connecting metal part

[0044] 150, 550 Fourth Radiation Section

[0045] 151, 551 The first end of the fourth radiating section

[0046] 152, 552 The second end of the fourth radiating section

[0047] 160 and 560 adjustable capacitors

[0048] 170 Proximity Sensors

[0049] 180° Adjustable Circuit

[0050] 181 Short-circuit path

[0051] 182 Capacitive Path

[0052] 183 First Inductive Path

[0053] 184 Second Inductive Path

[0054] 185. Disconnection Path

[0055] 186 Switch

[0056] 190, 590 signal sources

[0057] 450 Fifth Radiation Department

[0058] 451 The first end of the fifth radiating section

[0059] 452 The second end of the fifth radiating section

[0060] 460 Sixth Radiation Department

[0061] 461 The first end of the sixth radiating section

[0062] 462 The second end of the sixth radiating section

[0063] 470 Seventh Radiation Department

[0064] 471 The first end of the seventh radiating section

[0065] 472 The second end of the seventh radiating section

[0066] C1 First capacitor

[0067] C2 Second capacitor

[0068] CP1 First Connection Point

[0069] CP2 Second Connection Point

[0070] CP3 Third Connection Point

[0071] CP4 Fourth Connection Point

[0072] GC coupling gap

[0073] GC1 First Coupling Gap

[0074] GC2 Second Coupling Gap

[0075] Lengths of L1, L2, L3, L4, L5, L6, and L7

[0076] LA First Inductor

[0077] LB Second Inductor

[0078] LC third inductor

[0079] SC1 First Control Signal

[0080] SC2 Second Control Signal

[0081] VSS ground potential

[0082] X Variable capacitance value

[0083] Z Variable impedance value Detailed Implementation

[0084] 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 detail with reference to the accompanying drawings.

[0085] 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.

[0086] 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.

[0087] 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 element(s) in the illustration. In addition to the orientations 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.

[0088] Figure 1 This diagram illustrates an antenna structure 100 according to an embodiment of the present invention. The antenna structure 100 can be incorporated into a mobile device, such as a smartphone, a tablet computer, or a notebook computer. Figure 1 In the embodiments, the antenna structure 100 includes at least: a first radiating element 110, a second radiating element 120, a third radiating element 130, a connection metal element 140, a tunable capacitor 160, a first inductor 1A, a first capacitor C1, and a second capacitor C2, wherein the first radiating element 110, the second radiating element 120, and the third radiating element 130 can all be made of metal materials, such as copper, silver, aluminum, iron, or their alloys.

[0089] For example, the first radiating portion 110 may generally present a small L-shape, but is not limited to this. Specifically, the first radiating portion 110 has a first end 111 and a second end 112, wherein the first end 111 of the first radiating portion 110 is coupled to a signal source 190 via a first capacitor C1. In some embodiments, the signal source 190 may be a radio frequency (RF) module, which can be used to excite the antenna structure 100.

[0090] For example, the second radiating portion 120 may generally be a short, straight strip, but is not limited to this. Specifically, the second radiating portion 120 has a first end 121 and a second end 122, wherein the first end 121 of the second radiating portion 120 is coupled to the second end 112 of the first radiating portion 110, and the second end 122 of the second radiating portion 120 is coupled to a ground voltage VSS via a second capacitor C2. In some embodiments, the ground voltage VSS may be provided by a system ground plane of the antenna structure 100 (not shown).

[0091] For example, the third radiating portion 130 may be generally a longer straight strip (compared to the second radiating portion 120), and may be generally perpendicular to the second radiating portion 120, but is not limited thereto. Specifically, the third radiating portion 130 has a first end 131 and a second end 132, wherein the first end 131 of the third radiating portion 130 is coupled to the second end 112 of the first radiating portion 110, and the second end 132 of the third radiating portion 130 is an open end. In some embodiments, the combination of the first radiating portion 110, the second radiating portion 120, and the third radiating portion 130 may generally form an F-shape.

[0092] For example, the connecting metal portion 140 may be generally in the shape of a straight strip, and may be generally parallel to the third radiating portion 130, but is not limited thereto. Specifically, the connecting metal portion 140 has a first end 141 and a second end 142, wherein the first end 141 is coupled to a first connection point CP1 on the second radiating portion 120 via a first inductor LA, and the second end 142 is coupled to ground potential VSS via an adjustable capacitor 160. In some embodiments, the connecting metal portion 140 is adjacent to the third radiating portion 130, wherein a coupling gap GC may be formed between the third radiating portion 130 and the connecting metal portion 140. Additionally, the adjustable capacitor 160 generates a variable capacitance value X according to a first control signal SC1. However, the invention is not limited thereto. In other embodiments, the antenna structure 100 may also be adjusted so that the first end 141 of the connecting metal portion 140 is coupled to a second connection point CP2 on the first radiating portion 110 via the first inductor LA. It must be understood that the terms "adjacent" or "adjacent" in this specification may refer to the distance between the corresponding two elements being less than a predetermined distance (e.g., 10 mm or less), but generally do not include the case where the corresponding two elements are in direct contact with each other (i.e., the aforementioned distance is shortened to 0).

[0093] In some embodiments, the antenna structure 100 further includes a fourth radiating portion 150, which may be made of a metallic material. For example, the fourth radiating portion 150 may generally have a larger L-shape (compared to the first radiating portion 110), and may be disposed between the third radiating portion 130 and the connecting metal portion 140, but is not limited thereto. Specifically, the fourth radiating portion 150 has a first end 151 and a second end 152, wherein the first end 151 of the fourth radiating portion 150 is coupled to a ground potential VSS, and the second end 152 of the fourth radiating portion 150 is an open-circuit end and extends toward the second radiating portion 120. In some embodiments, the fourth radiating portion 150 is adjacent to the third radiating portion 130, wherein a first coupling gap GC1 may be formed between the third radiating portion 130 and the fourth radiating portion 150. In some embodiments, the fourth radiating portion 150 is adjacent to the connecting metal portion 140, wherein a second coupling gap GC2 may be formed between the connecting metal portion 140 and the fourth radiating portion 150. In addition, the fourth radiating part 150 is an optional component and can be removed in other embodiments.

[0094] In some embodiments, the antenna structure 100 may cover a first frequency band, a second frequency band, and a third frequency band. For example, the first frequency band may be between 617 MHz and 960 MHz, the second frequency band may be between 1400 MHz and 2690 MHz, and the third frequency band may be between 3300 MHz and 5925 MHz. Therefore, the antenna structure 100 will at least support broadband operation of LTE (Long Term Evolution).

[0095] In some embodiments, the operating principle of the antenna structure 100 may be as follows. The first radiating section 110 and the third radiating section 130 can generate the aforementioned first and second frequency bands. The first radiating section 110 and the second radiating section 120 can generate the aforementioned third frequency band. Additionally, the first capacitor C1 and the second capacitor C2 can be used to filter out low-frequency noise related to the antenna structure 100, while the first inductor LA can be used to filter out high-frequency noise related to the antenna structure 100. According to actual measurement results, the addition of the adjustable capacitor 160 and the connecting metal section 140 helps to fine-tune the impedance matching of the aforementioned first frequency band, while the addition of the fourth radiating section 150 helps to increase the bandwidth of the aforementioned first frequency band. It must be understood that the connecting metal section 140 does not substantially contribute to the frequency band of the antenna structure 100. In other words, even if the connecting metal part 140 is removed, the antenna structure 100 may still cover the aforementioned first frequency band, second frequency band, and third frequency band.

[0096] In some embodiments, the component dimensions and parameters of the antenna structure 100 may be as described below. The total length L1 of the first radiating portion 110 and the second radiating portion 120 may be between 0.125 and 0.25 times the wavelength of the third frequency band of the antenna structure 100 (λ / 8 to λ / 4). The total length L2 of the first radiating portion 110 and the third radiating portion 130 may be between 0.125 and 0.25 times the wavelength of the first frequency band of the antenna structure 100 (λ / 8 to λ / 4). The length L3 of the connecting metal portion 140 may be between 0.0625 and 0.25 times the wavelength of the first frequency band of the antenna structure 100 (λ / 16 to λ / 4). The length L4 of the fourth radiating portion 150 may be between 0.0625 and 0.125 times the wavelength of the first frequency band of the antenna structure 100 (λ / 16 to λ / 8). The width of the coupling gap GC may be between 3 mm and 8 mm. The width of the first coupling gap GC1 may be between 1 mm and 4 mm. The width of the second coupling gap GC2 can be between 0.5 mm and 8 mm. The capacitance value of the first capacitor C1 can be between 22 pF and 77 pF. The capacitance value of the second capacitor C2 can be between 22 pF and 77 pF. The inductance value of the first inductor LA can be between 12 nH and 63 nH. In response to the first control signal SC1, the variable capacitance value X of the adjustable capacitor 160 can be any value in the range of 0.1 pF to 30 pF. The above component dimensions and parameter ranges were determined based on the results of multiple experiments, which helps to optimize the operating bandwidth and impedance matching of the antenna structure 100.

[0097] The following embodiments will describe different configurations and detailed structural features of the antenna structure 100. 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 2 This 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, the antenna structure 200 further includes a proximity sensor 170, a tunable circuit 180, a second inductor LB, and a third inductor LC. The second inductor LB is coupled between the second terminal 142 of the connecting metal portion 140 and the proximity sensor 170. The second terminal 142 of the connecting metal portion 140 can also be coupled to a ground potential VSS via the third inductor LC. For example, the inductance value of the second inductor LB can be between 210nH and 450nH, while the inductance value of the third inductor LC can be between 57nH and 270nH. The first terminal 151 of the fourth radiating portion 150 can also be coupled to a ground potential VSS via the tunable circuit 180. The tunable circuit 180 generates a variable impedance value Z according to a second control signal SC2. For example, the aforementioned first control signal SC1 and second control signal SC2 can both be generated by a processor based on a user input, but are not limited to this. According to actual measurement results, the addition of the first inductor LA, the second inductor LB, and the third inductor LC can prevent the proximity sensor 170 from malfunctioning due to high-frequency noise related to the antenna structure 200, while the application of the adjustable circuit 180 can further improve the bandwidth of the first frequency band of the antenna structure 200. It must be understood that both the first radiating part 110 and the third radiating part 130 can serve as a sensing pad for the proximity sensor 170. Therefore, the antenna structure 200 can also be considered a hybrid antenna, which can simultaneously provide proximity sensing and specific absorption rate (SAR) suppression without increasing the design area. 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.

[0099] Figure 3 This diagram shows the structure of an adjustable circuit 180 according to an embodiment of the present invention. Figure 3In one embodiment, the adjustable circuit 180 includes a short-circuit path 181, a capacitive path 182, a first inductive path 183, a second inductive path 184, an open-circuit path 185, and a switch element 186. For example, the short-circuit path 181, capacitive path 182, first inductive path 183, second inductive path 184, and open-circuit path 185 can all be coupled to ground potential VSS, and they can have different impedance values. Specifically, one end of the switch element 186 is coupled to the first end 151 of the fourth radiating section 150, while the other end of the switch element 186 switches between the short-circuit path 181, capacitive path 182, first inductive path 183, second inductive path 184, and open-circuit path 185 according to the second control signal SC2. That is, if the adjustable circuit 180 uses the switch 186 to select one of the short-circuit path 181, capacitive path 182, first inductive path 183, second inductive path 184, and open-circuit path 185, then the fourth radiating section 150 can be coupled to the ground potential VSS via the selected single path. Furthermore, the remaining unselected paths remain in a non-conductive state, which does not affect the variable impedance value Z of the adjustable circuit 180. In other embodiments, the adjustable circuit 180 may also include fewer or more paths depending on different requirements.

[0100] Figure 4 This diagram shows an antenna structure 400 according to an embodiment of the present invention. Figure 4 and Figure 2 Similar. Figure 4In this embodiment, the antenna structure 400 further includes a fifth radiating section 450, a sixth radiating section 460, and a seventh radiating section 470, all of which can be made of metal. Additionally, the shapes of each of the first radiating section 410, the second radiating section 420, and the third radiating section 430 of the antenna structure 400 are slightly adjusted, without affecting their radiation function. Specifically, the fifth radiating section 450 has a first end 451 and a second end 452, wherein the first end 451 of the fifth radiating section 450 is coupled to a bend in the first radiating section 410, and the second end 452 of the fifth radiating section 450 is an open-circuit end. The sixth radiating section 460 is at least partially surrounded by the fifth radiating section 450. The sixth radiating section 460 has a first end 461 and a second end 462, wherein the first end 461 of the sixth radiating section 460 is coupled to a third connection point CP3 on the first radiating section 410, and the second end 462 of the sixth radiating section 460 is an open-circuit end. The seventh radiating section 470 has a first end 471 and a second end 472, wherein the first end 471 of the seventh radiating section 470 is coupled to a fourth connection point CP4 on the third radiating section 430, and the second end 472 of the seventh radiating section 470 is an open-circuit end and can extend toward the connecting metal section 140. For example, the length L5 of the fifth radiator 450 can be between 0.0625 and 0.125 times the wavelength of the second frequency band of the antenna structure 400 (λ / 16 to λ / 8), the length L6 of the sixth radiator 460 can be between 0.0625 and 0.125 times the wavelength of the third frequency band of the antenna structure 400 (λ / 16 to λ / 8), and the length L7 of the seventh radiator 470 can be between 4 mm and 6 mm, but is not limited to these. According to actual measurement results, the addition of the fifth radiator 450, the sixth radiator 460, and the seventh radiator 470 helps to further improve the impedance matching of the second and third frequency bands of the antenna structure 400. Figure 4 The remaining features of the antenna structure 400 are all the same as Figure 2 The antenna structures are similar to those of the 200, so both embodiments can achieve similar operational effects.

[0101] Figure 5 This diagram shows an antenna structure 500 according to another embodiment of the present invention. Figure 5 and Figure 1 Similar. Figure 5In one embodiment, the antenna structure 500 includes: a first radiating part 510, a second radiating part 520, a third radiating part 530, a connecting metal part 540, a fourth radiating part 550, an adjustable capacitor 560, and a first inductor LA. The first radiating part 510, the second radiating part 520, the third radiating part 530, and the fourth radiating part 550 can all be made of metal. For example, the combination of the first radiating part 510, the second radiating part 520, and the third radiating part 530 can generally form a T-shape, while the fourth radiating part 550 can generally form an L-shape. Specifically, the first radiating part 510 has a first end 511 and a second end 512, wherein the first end 511 of the first radiating part 510 is coupled to a signal source 590. The second radiating section 520 has a first end 521 and a second end 522, wherein the first end 521 of the second radiating section 520 is coupled to the second end 512 of the first radiating section 510, and the second end 522 of the second radiating section 520 is an open-circuit end. The third radiating section 530 has a first end 531 and a second end 532, wherein the first end 531 of the third radiating section 530 is coupled to the second end 512 of the first radiating section 510, and the second end 532 of the third radiating section 530 is an open-circuit end. For example, the second ends 522 of the second radiating section 520 and the second ends 532 of the third radiating section 530 may extend in generally opposite and mutually distant directions. The connecting metal portion 540 has a first end 541 and a second end 142, wherein the first end 541 of the connecting metal portion 540 is coupled to the first end 511 of the first radiating portion 510 via a first inductor LA, and the second end 542 of the connecting metal portion 540 is coupled to a ground potential VSS via an adjustable capacitor 560. The fourth radiating portion 550 has a first end 551 and a second end 552, wherein the first end 551 of the fourth radiating portion 550 is coupled to the ground potential VSS, and the second end 552 of the fourth radiating portion 550 is an open circuit end. For example, the second ends 522 of the second radiating portion 520 and the second ends 552 of the fourth radiating portion 550 may extend in substantially the same direction. In some embodiments, the fourth radiating portion 550 is adjacent to the third radiating portion 530, wherein a coupling gap GC may be formed between the third radiating portion 530 and the fourth radiating portion 550. In addition, the adjustable capacitor 560 generates a variable capacitance value X according to a first control signal SC1. According to actual measurement results, antenna structure 500 can also cover a first frequency band, a second frequency band, and a third frequency band, wherein the aforementioned first frequency band can be between 617MHz and 960MHz, the aforementioned second frequency band can be between 1400MHz and 2690MHz, and the aforementioned third frequency band can be between 3300MHz and 5925MHz. Figure 5 The antenna structure of 500 has all other features similar to Figure 1Since the antenna structures are similar to those of the 100, both embodiments can achieve similar operational effects.

[0102] This invention proposes a novel antenna structure. Compared with conventional designs, this invention has advantages such as small size, wide bandwidth, and the ability to incorporate proximity sensors, making it well-suited for use in a wide variety of mobile communication devices.

[0103] It is worth noting that the component dimensions, shapes, parameters, 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... Figures 1-5 The state illustrated. This invention may include only... Figures 1-5 Any one or more features of any one or more embodiments. In other words, not all the features illustrated need to be implemented simultaneously in the antenna structure of the present invention.

[0104] The ordinal numbers in this specification and the scope of the claims, such as "first", "second", "third", etc., are not sequential in any way; they are only used to distinguish two different elements with the same name.

[0105] While 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 should be determined by the scope of the appended claims.

Claims

1. An antenna structure comprising: First Radiation Section; A first capacitor, wherein the first radiating portion is coupled to a signal source via the first capacitor; A second radiating portion, which is coupled to the first radiating portion; A second capacitor, wherein the second radiating portion is also coupled to a ground potential via the second capacitor; A third radiating part, which is coupled to the first radiating part; A connecting metal part; A first inductor, wherein the connecting metal portion is coupled to the first radiating portion or the second radiating portion via the first inductor; as well as An adjustable capacitor generates a variable capacitance value according to a first control signal, wherein the connecting metal portion is also coupled to the ground potential via the adjustable capacitor.

2. The antenna structure as described in claim 1, further comprising: A proximity sensor; A second inductor, the second inductor being coupled between the connecting metal portion and the adjacent sensor; as well as A third inductor, wherein the connecting metal portion is also coupled to the ground potential via the third inductor.

3. The antenna structure as claimed in claim 2, wherein the first radiating part and the third radiating part serve as a sensing plate of the proximity sensor.

4. The antenna structure as claimed in claim 1, wherein a coupling gap is formed between the connecting metal portion and the third radiating portion, and the width of the coupling gap is between 3 mm and 8 mm.

5. The antenna structure as claimed in claim 1, wherein the antenna structure covers a first frequency band, a second frequency band, and a third frequency band.

6. The antenna structure as described in claim 5, further comprising: A fourth radiating part is coupled to the ground potential, wherein the fourth radiating part is adjacent to the third radiating part and the connecting metal part.

7. The antenna structure as described in claim 6, further comprising: An adjustable circuit generates a variable impedance value according to a second control signal, wherein the fourth radiating part is also coupled to the ground potential via the adjustable circuit.

8. The antenna structure of claim 7, wherein the adjustable circuit comprises: A short-circuit path that is coupled to the ground potential; A capacitive path coupled to the ground potential; A first inductive path coupled to the ground potential; A second inductive path coupled to the ground potential; An open circuit path coupled to the ground potential; as well as A switcher coupled to the fourth radiating section, wherein the switcher switches between the short-circuit path, the capacitive path, the first inductive path, the second inductive path, and the open-circuit path according to the second control signal.

9. The antenna structure as claimed in claim 6, wherein a first coupling gap is formed between the third radiating part and the fourth radiating part, and a second coupling gap is formed between the connecting metal part and the fourth radiating part, wherein the width of the first coupling gap is between 1 mm and 4 mm, and the width of the second coupling gap is between 0.5 mm and 8 mm.

10. The antenna structure of claim 5, wherein the first frequency band is between 617MHz and 960MHz, the second frequency band is between 1400MHz and 2690MHz, and the third frequency band is between 3300MHz and 5925MHz.

11. The antenna structure as claimed in claim 5, wherein the total length of the first radiating part and the second radiating part is between 0.125 times and 0.25 times the wavelength of the third frequency band.

12. The antenna structure of claim 5, wherein the total length of the first radiating part and the third radiating part is between 0.125 times and 0.25 times the wavelength of the first frequency band.

13. The antenna structure of claim 5, wherein the length of the connecting metal portion is between 0.0625 times and 0.25 times the wavelength of the first frequency band.

14. The antenna structure of claim 6, wherein the length of the fourth radiating part is between 0.0625 times and 0.125 times the wavelength of the first frequency band.

15. The antenna structure as described in claim 1, further comprising: A fifth radiating section, which is coupled to the first radiating section; A sixth radiating portion coupled to the first radiating portion, wherein the sixth radiating portion is at least partially surrounded by the fifth radiating portion; as well as A seventh radiating part is coupled to the third radiating part.

16. The antenna structure of claim 1, wherein the capacitance values ​​of each of the first capacitor and the second capacitor are between 22pF and 77pF.

17. The antenna structure of claim 1, wherein the inductance value of the first inductor is between 12nH and 63nH.

18. The antenna structure of claim 2, wherein the inductance value of the second inductor is between 210nH and 450nH.

19. The antenna structure as claimed in claim 2, wherein the inductance value of the third inductor is between 57nH and 270nH.

20. An antenna structure comprising: A first radiating section, the first radiating section being coupled to a signal source; A second radiating portion, which is coupled to the first radiating portion; A third radiating portion is coupled to the first radiating portion, wherein the second radiating portion and the third radiating portion extend in substantially opposite directions; A fourth radiating part, the fourth radiating part being coupled to a ground potential, wherein the fourth radiating part is adjacent to the third radiating part; A connecting metal part; A first inductor, wherein the connecting metal portion is coupled to the first radiating portion via the first inductor; as well as An adjustable capacitor generates a variable capacitance value according to a first control signal, wherein the connecting metal portion is also coupled to the ground potential via the adjustable capacitor.

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