Electronic device and antenna structure

Abstract

An electronic device and an antenna structure are provided. The electronic device comprises a housing, an antenna structure and a feed-in member. The antenna structure comprises a grounding member, a feed-in radiation member, a switching circuit and a first parasitic radiation member. The feed-in radiation part comprises a feed-in part, a first radiation part, a second radiation part, a first grounding arm and a second grounding arm; the feed-in part is connected between the first radiation part and the second radiation part; the first grounding arm and the second grounding arm are connected to the first radiation part; the switching circuit is electrically connected to the first grounding arm and the second grounding arm. The first parasitic radiation part is connected to the grounding part and is coupled with the feed-in radiation part; the feed-in piece is used for feeding in a signal; when the switching circuit is switched to a first mode, a signal passes through the first grounding arm; when the switching circuit is switched to a second mode, the signal passes through the second grounding arm. According to the electronic device and the antenna structure provided by the invention, the antenna structure can meet the requirement of multiple frequency bands while the electronic device is miniaturized.

Description

Technical Field

[0001] The present invention relates to an electronic device and an antenna structure, and in particular to an antenna structure covering multiple frequency bands and an electronic device having the antenna structure. Background Art

[0002] Current electronic devices, such as notebook computers, are not only designed to be thinner and lighter, but also to be highly efficient. Recently, the appearance of notebook computers has a design trend towards narrow frames. Therefore, the space for setting antennas on electronic devices is very limited. Existing antenna architectures will have the problem of insufficient bandwidth reduction under the narrow frame requirements of electronic devices.

[0003] Therefore, how to design an antenna structure that can simultaneously receive and transmit multiple wireless frequency bands and has good antenna efficiency within the limited space inside the electronic device is an important issue in the art.

[0004] Therefore, it is necessary to provide an electronic device and an antenna structure to solve the above problems. Summary of the invention

[0005] The present invention mainly provides an antenna structure and an electronic device to solve the problem of insufficient bandwidth of the antenna structure under the requirement of miniaturization of the electronic device.

[0006] In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide an electronic device, which includes a shell, an antenna structure and a feeding element. The antenna structure is arranged in the shell. The antenna structure includes a grounding element, a feeding radiator, a switching circuit and a first parasitic radiator. The feeding radiator includes a feeding part, a first radiating part, a second radiating part, a first grounding arm and a second grounding arm. The feeding part is connected between the first radiating part and the second radiating part. The first grounding arm and the second grounding arm are connected to the first radiating part. The switching circuit is electrically connected to the first grounding arm and the second grounding arm. The first parasitic radiator is connected to the grounding element and is coupled with the feeding radiator. The feeding element is used to feed a signal. The feeding element includes a grounding end and a feeding end, the grounding end is electrically connected to the grounding element, and the feeding end is electrically connected to the feeding part. When the switching circuit is switched to a first mode, the signal passes through the first grounding arm, and when the switching circuit is switched to a second mode, the signal passes through the second grounding arm.

[0007] In order to solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide an antenna structure, which includes a grounding member, a feeding radiating member, a switching circuit and a first parasitic radiating member. The feeding radiating member includes a feeding portion, a first radiating portion, a second radiating portion, a first grounding arm and a second grounding arm. The feeding portion is connected between the first radiating portion and the second radiating portion. The first grounding arm and the second grounding arm are connected to the first radiating portion. The switching circuit is electrically connected to the first grounding arm and the second grounding arm. The first parasitic radiating member is connected to the grounding member and is coupled to the feeding radiating member. The feeding portion is used to feed a signal through a feeding member, and when the switching circuit is switched to a first mode, the signal passes through the first grounding arm, and when the switching circuit is switched to a second mode, the signal passes through the second grounding arm.

[0008] One of the beneficial effects of the present invention is that the antenna structure and electronic device provided by the present invention can meet the requirements of multiple frequency bands while miniaturizing the electronic device through the technical solutions of "the first ground arm and the second ground arm are connected to the first radiation part, and the switching circuit is electrically connected to the first ground arm and the second ground arm" and "when the switching circuit is switched to a first mode, the signal passes through the first ground arm, and when the switching circuit is switched to a second mode, the signal passes through the second ground arm".

[0009] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of an electronic device of the present invention.

[0011] Figure 2 FIG. 1 is a schematic diagram of an antenna structure according to a first embodiment of the present invention.

[0012] Figure 3 FIG. 4 is a first stereoscopic schematic diagram of an antenna structure according to a first embodiment of the present invention.

[0013] Figure 4 It is a second stereoscopic schematic diagram of the antenna structure according to the first embodiment of the present invention.

[0014] Figure 5 FIG. 4 is a schematic diagram of a switching circuit according to a first embodiment of the present invention.

[0015] Figure 6 FIG. 4 is a schematic diagram of an antenna structure according to a second embodiment of the present invention.

[0016] Figure 7 FIG. 4 is a schematic diagram of a switching circuit according to a second embodiment of the present invention.

[0017] Figure 8 FIG. 4 is a schematic diagram of an antenna structure according to a third embodiment of the present invention.

[0018] Fig. 9 FIG. 4 is a schematic diagram of a switching circuit according to a third embodiment of the present invention.

[0019] Fig.10 FIG. 4 is a schematic diagram of an antenna structure according to a fourth embodiment of the present invention.

[0020] Fig.11 FIG. 5 is a schematic diagram of an antenna structure according to a fifth embodiment of the present invention.

[0021] Main component symbols:

[0022] D Electronic Devices

[0023] 1 Housing

[0024] 2 Antenna Structure

[0025] 21 Grounding piece

[0026] 22 Feed Radiator

[0027] 221 Feeding Department

[0028] 221A Section 1

[0029] 221B Section 2

[0030] 222 First Radiation Section

[0031] 223 Second Radiation

[0032] 224 First grounding arm

[0033] 225 Second grounding arm

[0034] 226 The third radiation

[0035] 227 Fourth Radiation Department

[0036] 228 Fifth Radiation Department

[0037] 2281 First Extension

[0038] 2282 Second Extension

[0039] 23 First parasitic radiator

[0040] 231 First Branch Road

[0041] 232 Second Branch Road

[0042] 233 Third Branch Road

[0043] 234 First matching element

[0044] 235 Second matching element

[0045] 236 Third matching element

[0046] 237 Matching Components

[0047] 24 Second parasitic radiator

[0048] 241 First Arm

[0049] 242 Second arm

[0050] 243 Third arm

[0051] 244 Fourth arm

[0052] 245 Fifth Arm

[0053] 246 Sixth Arm

[0054] 3 Feedthrough

[0055] 31 Feeding terminal

[0056] 32 Ground terminal

[0057] 4 Proximity sensing circuit

[0058] S Switching Circuit

[0059] L Inductor

[0060] C Capacitor element

[0061] L1 First inductor element

[0062] C1 First capacitor element

[0063] C2 Second capacitor element

[0064] SP1, SP2 dotted line

[0065] B substrate

[0066] B1 First surface

[0067] B2 Second surface

[0068] B3 Third surface

[0069] FP Feed Point

[0070] E1 First Passive Component

[0071] E2 Second passive component

[0072] E3 Third Passive Component

[0073] E4 Fourth Passive Component

[0074] P1 First Path

[0075] P2 Second Path

[0076] P3 The Third Path

[0077] P4 Fourth Path

[0078] SW1 First switch

[0079] SW2 Second switch

[0080] SW3 The third switch

[0081] SW4 Fourth switch

[0082] R Control circuit DETAILED DESCRIPTION

[0083] The following is a specific embodiment to illustrate the implementation of the "electronic device and antenna structure" disclosed in the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations, not depictions based on actual dimensions, and it is stated in advance. The following implementations will further explain the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention. In addition, it should be understood that although the terms "first", "second", "third" and the like may be used in this article to describe various components, these components should not be limited by these terms. These terms are mainly used to distinguish one component from another. In addition, the term "or" used in this article should include any one or more combinations of the associated listed items depending on the actual situation. In addition, the term “connect” in the present invention means that there is a physical connection between two elements and it can be a direct connection or an indirect connection, and the term “couple” in the present invention means that two elements are separated from each other and have no physical connection, but the electric field energy generated by the current of one element excites the electric field energy of another element.

[0084] See also Figure 1 As shown, Figure 1Schematic diagram of the electronic device of the present invention. The present invention provides an electronic device D, which can be a smart phone, a tablet computer or a notebook computer, but the present invention is not limited thereto. The present invention takes the electronic device D as an example of a notebook computer. The electronic device D includes a housing 1 and an antenna structure 2 disposed inside the housing 1. The electronic device D can generate at least one operating frequency band through the antenna structure 2. In addition, for example, the antenna structure 2 is disposed at the screen frame position of the electronic device D, but the present invention is not limited to the number and position of the antenna structure 2.

[0085] [First embodiment]

[0086] See also Figure 1 and Figure 2 As shown, Figure 2 Schematic diagram of an antenna structure according to a first embodiment of the present invention. The first embodiment of the present invention provides an antenna structure 2, which includes a grounding element 21, a feeding radiation element 22, a switching circuit S and a first parasitic radiation element 23. Figure 3 and Figure 4 As shown, Figure 3 and Figure 4 3D schematic diagrams of the antenna structure of the first embodiment of the present invention at different viewing angles. For example, the antenna structure 2 can be disposed on a substrate B, and the feed radiation element 22 and the first parasitic radiation element 23 can be located on opposite sides of the substrate B. Figure 3 and Figure 4 As shown, the first parasitic radiation element 23 is disposed on the first surface B1, the feeding radiation element 22 is disposed on the second surface B2, and the first surface B1 and the second surface B2 are located on opposite sides of the substrate B. Figure 2 and Figure 3 As shown, Figure 2 The antenna structure 2 shown is a user-facing Figure 3 The direction of the first surface B1 is presented (negative Z-axis direction).

[0087] The feeding radiation element 22 includes a feeding portion 221, a first radiation portion 222, a second radiation portion 223, a first ground arm 224, and a second ground arm 225. The feeding portion 221 is connected between the first radiation portion 222 and the second radiation portion 223, and the first ground arm 224 and the second ground arm 225 are connected to the first radiation portion 222. The switching circuit S is electrically connected to the first ground arm 224 and the second ground arm 225. The first parasitic radiation element 23 is connected to the ground element 21, and the first parasitic radiation element 23 is coupled to at least one radiation portion of the feeding radiation element 22.

[0088] The electronic device D further includes a feeding element 3 for feeding a signal. For example, the feeding element 3 may be a coaxial cable, but the present invention is not limited thereto. The feeding element 3 includes a feeding end 31 and a grounding end 32, the grounding end 32 is connected to the grounding element 21, and the feeding end 31 is connected to the feeding portion 221. Therefore, the signal can be fed into the antenna structure 2 via the feeding portion 221 and excite at least one operating frequency band.

[0089] Furthermore, the first radiation portion 222 and the second radiation portion 223 of the feed radiation element 22 also extend to the third surface B3 of the substrate B, and the third surface B3 is connected between the first surface B1 and the second surface B2. However, the present invention is not limited to the presentation form of the antenna structure 2. It should also be noted that in Figure 3 and Figure 4 In the figure, only the feeding point FP is used to indicate the location of the feeding element 3, and the feeding element 3 is omitted and not shown. By configuring the substrate B, the feeding radiation element 22 and the first parasitic radiation element 23 are separated from each other. It should be noted that, Figure 3 , Figure 4 Although the switching circuit S is disposed on the second surface B2 , the present invention is not limited to the specific location of the switching circuit S, as long as the switching circuit S can electrically connect the first ground arm 224 , the second ground arm 225 and the grounding member 21 .

[0090] When the signal is fed into the antenna structure 2 by the feeding portion 221, the first radiating portion 222 of the feeding radiating element 2 is coupled with the first parasitic radiating element 23 to generate an operating frequency band including 880-960 MHz, 1500 MHz, 2690 MHz, and 4-5 GHz. More specifically, the first radiating portion 222 is coupled with the first parasitic radiating element 23, and then switched to different modes by the switching circuit S to generate an operating frequency band including 617-960 MHz, 1900 MHz, and 3300 MHz. In addition, the second radiating portion 223 is used to be excited to generate an operating frequency band of 1710 MHz to 2500 MHz, and 4 GHz.

[0091] See also Figure 2 and Figure 5 As shown, Figure 5 Schematic diagram of a switching circuit of a first embodiment of the present invention. The switching circuit S includes a first path P1 and a second path P2. The first path P1 has a first switch SW1, and the second path P2 has a second switch SW2. One end of the first path P1 is electrically connected to the first grounding arm 224, and the other end of the first path P1 is electrically connected to the grounding member 21. One end of the second path P2 is electrically connected to the second grounding arm 225, and the other end of the second path P2 is electrically connected to the grounding member 21. The equivalent impedance of the first path P1 is different from the equivalent impedance of the second path P2.

[0092] The antenna structure 2 of the present invention can switch to a variety of different modes through a switching circuit S to allow the signal to pass through a signal coupling path of different lengths or equivalent impedances. Further, the electronic device D may also include a control circuit R. The control circuit R can control the switching switch of the switching circuit S so that the switching circuit S switches to one of a plurality of modes, thereby adjusting the operating frequency band generated by the antenna structure 2. The switching mechanism of the switching circuit S in different modes will be described in detail below. It should be noted that when describing any mode later, only the switching switch in the conductive state will be indicated, and other switching switches not mentioned are in the non-conductive state.

[0093] When the switching circuit S switches to a first mode, the first switch SW1 is turned on. The signal passes through the feeding portion 221, a portion of the first radiating portion 222 and the first grounding arm 224, and then goes to the ground via the first path P1, so that the first radiating portion 222 and the first parasitic radiating element 23 are coupled to each other to generate a first operating frequency band. The path of the signal in the first mode is as follows: Figure 2 As shown by the dotted line SP1.

[0094] When the switching circuit S switches to a second mode, the second switch SW2 is turned on. The signal passes through the feeding portion 221, a portion of the first radiating portion 222 and the second grounding arm 225, and then goes to the ground through the second path P2, so that the first radiating portion 222 and the first parasitic radiating element 23 are coupled to each other to generate a second operating frequency band. The path of the signal in the second mode is as follows: Figure 2 As shown by the dotted line SP2.

[0095] Further, if Figure 2 and Figure 5 As shown, in the first mode, the signal is grounded from the feed end 32 via the first ground arm 224 (dashed line SP1), and the first operating frequency band generated by the antenna structure 2 is affected by the second ground arm 225. Similarly, in the second mode, the signal is grounded from the feed end 32 via the second ground arm 225 (dashed line SP2), and the second operating frequency band generated by the antenna structure 2 is affected by the first ground arm 224. Since the length of the first ground arm 224 is greater than the length of the second ground arm 225, the second operating frequency band will shift to a lower frequency compared to the first operating frequency band. Therefore, the center frequency of the first operating frequency band will be higher than the operating frequency of the second operating frequency band. For example, the first operating frequency band includes LTE band 5, and the second operating frequency band includes LTE band 71.

[0096] In addition, the present invention is not limited by the number of paths in the switching circuit S. For example, Figure 5As shown, the switching circuit S may further include a third path P3 and a fourth path P4. The third path P3 has a third switching switch SW3, and the fourth path P4 has a fourth switching switch SW4. The equivalent impedance of the third path P3 is different from the equivalent impedance of the fourth path P4. One end of the third path P3 is electrically connected to the first grounding arm 224, and the other end of the third path P3 is electrically connected to the grounding member 21. One end of the fourth path P4 is electrically connected to the second grounding arm 225, and the other end of the fourth path P4 is electrically connected to the grounding member 21. According to the design of the third path P3 and the fourth path P4, the switching circuit S can also switch to a third mode and a fourth mode.

[0097] When the switching circuit S switches to the third mode, the fourth switch SW4 is turned on, and the signal passes through the first ground arm 224 and is grounded via the fourth path P4, so that the first radiation portion 222 and the first parasitic radiation element 23 are coupled to each other to generate a third operating frequency band. For example, the third operating frequency band includes LTE band 28.

[0098] When the switching circuit S is switched to the fourth mode, the third switch SW3 and the fourth switch SW4 are both in the on state, so the signal passes through the first ground arm 224 and the second ground arm 225 at the same time and is grounded via the third path P3 and the fourth path P4, so that the first radiating portion 222 and the first parasitic radiating element 23 are coupled to each other to generate a fourth operating frequency band. For example, the fourth operating frequency band includes LTE band 14.

[0099] In the first mode to the fourth mode, the switching circuit S has at least one switch in the on state, so that the feed radiator 22 becomes a planar inverted F antenna (PIFA) structure, but the present invention is not limited to this. For example, the switching circuit S can also be used to switch to a fifth mode. When the switching circuit S is switched to the fifth mode, all the switches (the first switch SW1, the second switch SW2, the third switch SW3 and the fourth switch SW4) are in a non-conducting state, so that the feed radiator 22 becomes a monopole antenna structure. In the fifth mode, the first radiating portion 222 and the first parasitic radiating element 23 are coupled with each other to generate a fifth operating frequency band. For example, the fifth operating frequency band includes LTE band 8.

[0100] In addition, in the present invention, the first path P1, the second path P2, the third path P3 and the fourth path P4 are respectively connected in series with the first passive element E1, the second passive element E2, the third passive element E3 and the fourth passive element E4. Different paths in the switching circuit S can achieve the effect of having different equivalent impedances by connecting different passive elements in series. In addition, the passive elements (the first passive element E1, the second passive element E2, the third passive element E3 and the fourth passive element E4) can be inductors, capacitors or resistors, and the present invention is not limited thereto. For example, the first passive element E1 and the second passive element E2 are both 0ohm resistors, the third passive element E3 is a 3nH inductor, and the fourth passive element E4 is a 5.1nH inductor.

[0101] Therefore, the antenna structure 2 can not only use the grounding arm (the first grounding arm 224 and the second grounding arm 225) and the passive elements (the first passive element E1, the second passive element E2, the third passive element E3 to the fourth passive element E4) in the switching circuit S to adjust the operating frequency band, impedance matching and radiation efficiency generated by the antenna structure 2. For example, comparing the first mode and the second mode, in the two modes, the first passive element E1 and the second passive element E2 are both 0 ohm resistors, but the antenna structure 2 generates different operating frequency bands (the first operating frequency band and the second operating frequency band) through different grounding arms (the first grounding arm 224 and the second grounding arm 225). In addition, for example, comparing the first mode and the third mode, in the two modes, the signal passes through the same grounding arm (the first grounding arm 224), but the antenna structure 2 generates different operating frequency bands through different passive elements, namely, the first passive element E1 (0 ohm resistor) and the fourth passive element E4 (5.1 nH inductor).

[0102] [Second embodiment]

[0103] See also Figure 6 and Figure 7 As shown, Figure 6 is a schematic diagram of an antenna structure according to a second embodiment of the present invention, Figure 7 It is a schematic diagram of the switching circuit of the second embodiment of the present invention. The antenna structure 2 of the second embodiment is similar to the first embodiment, and the similarities are not repeated here. The main difference is that the antenna structure 2 of the second embodiment also includes a proximity sensing circuit 4, which is electrically connected to the first ground arm 224. The antenna structure 2 also includes a first inductor element L1 and at least one capacitor element. The at least one capacitor element is electrically connected between the ground arm (the first ground arm 224 and the second ground arm 225) and the grounding piece 21. Further, the at least one capacitor element is electrically connected between the ground arm (the first ground arm 224 and the second ground arm 225) and the switching circuit S, or is electrically connected between the switching circuit S and the grounding piece 21. The present invention is not limited to the number of the at least one capacitor element. For example, in Figure 6 and Figure 7 In the embodiment, the antenna structure 2 includes a first capacitor C1 and a second capacitor C2. The first capacitor L1 is electrically connected between the proximity sensing circuit 4 and the first ground arm 224. The first capacitor C1 is electrically connected between the first ground arm 224 and the switching circuit S, and the second capacitor C2 is electrically connected between the second ground arm 225 and the switching circuit S.

[0104] For example, the proximity sensing circuit 4 can be a capacitance sensing circuit, and the feed radiation element 22 of the antenna structure 2 can be used as a sensing electrode for the proximity sensing circuit 4 to measure the capacitance value. In this way, the proximity sensing circuit 4 measures the distance between an object (such as the user's leg or other part) and the antenna structure 2. The proximity sensing circuit 4 is also electrically connected to a main circuit board (not shown). The sensing signal sensed by the proximity sensing circuit 4 through the sensing electrode will be transmitted back to the main circuit board. In this way, the electronic device D can have the function of sensing whether the human body is close to the antenna structure 2, and then adjust the signal energy transmitted to the antenna by the wireless radio frequency module (not shown) on the main circuit board, so as to avoid the problem of excessively high specific absorption rate (SAR) of electromagnetic wave energy per unit mass of the biological body.

[0105] In addition, the feeding portion 221 may include a first section 221A and a second section 221B, the first section 221A is connected to the first radiating portion 222, and the second section 221B is electrically connected to the feeding element 3. The antenna structure 2 further includes a capacitor element C, which is electrically connected between the first section 221A and the second section 221B.

[0106] For example, the capacitance value of the capacitor element C is 39pF, the capacitance values ​​of the first capacitor element C1 and the second capacitor element C2 are 56pF, and the inductance value of the first inductor element L1 is 100nH. The capacitor element C can be used as a DC block to prevent the DC signal generated by the proximity sensing circuit 4 from flowing into the system end of the electronic device D through the feed-in element 3. The first capacitor element C1 and the second capacitor element C2 can also be used as a DC block to prevent the DC signal generated by the proximity sensing circuit 4 from being directly grounded through the switching circuit S. The first inductor element L1 can be used as an RF choke to prevent the RF signal from flowing into the proximity sensing circuit 4.

[0107] The present invention does not limit the specific location of the proximity sensing circuit 4. For example, the proximity sensing circuit 4 can be integrated into the switching circuit S; or, the proximity sensing circuit 4 can also be independently configured outside the switching circuit S, such as configured on the substrate B of the antenna structure 2 or at a position adjacent to the antenna structure 2; or, the proximity sensing circuit 4 can also be independently configured on the main circuit board.

[0108] [Third embodiment]

[0109] See also Figure 8 and Fig. 9 , Figure 8 is a schematic diagram of an antenna structure according to a third embodiment of the present invention, Fig. 9 Schematic diagram of the switching circuit of the third embodiment of the present invention. The antenna structure 2 of the third embodiment is similar to the second embodiment, and the similarities are not repeated here. The main difference is that in the antenna structure 2 of the third embodiment, the proximity sensing circuit 4 is electrically connected to the second ground arm 225, and the first inductor element L1 is electrically connected between the proximity sensing circuit 4 and the second ground arm 225.

[0110] [Fourth embodiment]

[0111] See also Fig.10 As shown, Fig.10 Schematic diagram of the antenna structure of the fourth embodiment of the present invention. The antenna structure 2 of the fourth embodiment is similar to the third embodiment, and the similarities are not repeated here. The main difference is that in the fourth embodiment, the feed radiator 22 of the antenna structure 2 also includes a second parasitic radiator 24, a third radiating portion 226 and a fourth radiating portion 227. The second parasitic radiator 24 can be located on the same surface of the substrate B as the feed radiator 22 (the shape of the substrate B is as shown in FIG. Figure 3 and Figure 4 The second parasitic radiation element 24 is connected between the grounding element 21 and the fourth radiation portion 227. The third radiation portion 226 and the fourth radiation portion 227 are connected to the feeding portion 221, the third radiation portion 226 is used to contribute to the operating frequency band of 2.4 GHz, and the fourth radiation portion 227 is used to contribute to the operating frequency band of 5 GHz. The fourth radiation portion 227 is closer to the grounding element 21 than the third radiation portion 226. The second parasitic radiation element 24 and the third radiation portion 226 are separated from each other and coupled to each other to generate an operating frequency band of 5 to 6 GHz and adjust the matching of the intermediate frequency range.

[0112] The antenna structure 2 further includes an inductor element L and a capacitor element C, and the feed portion 221 includes a first section 221A and a second section 221B. The first section 221A is connected to the first radiation portion 222, and the second section 221B is connected to the fourth radiation portion 227. The capacitor element C is electrically connected between the first section 221A and the second section 221B, and the inductor element L is electrically connected between the fourth radiation portion 227 and the second parasitic radiation element 24. By configuring the inductor element L and the capacitor element C, the impedance matching of the antenna structure 2 can be adjusted.

[0113] The first parasitic radiation element 23 includes a first branch 231 , a second branch 232 and a third branch 233 , wherein the first branch 231 is connected between the ground element 21 and the second branch 232 , and the third branch 233 is connected to the second branch 232 .

[0114] The first parasitic radiation element 23 also includes a first matching element 234, a second matching element 235 and a third matching element 236. The first matching element 234 and the second matching element 235 are arranged in the second branch 232, and the third matching element 236 is arranged in the third branch 233. The first matching element 234 is coupled with the first ground arm 224 to adjust the matching of the high frequency 4 to 5 GHz. The second matching element 235 is coupled with the second ground arm 225 to control the frequency deviation of 2690 MHz and 3800 MHz. The third matching element 236 is coupled with the feeding portion 221 to adjust the matching of the high frequency 4 to 5 GHz.

[0115] For example, when the antenna structure 2 is disposed on a substrate (eg Figure 3 , Figure 4 When the substrate B is shown in FIG. 1 , but the present invention is not limited thereto), the feeding radiation element 22 and the first parasitic radiation element 23 can be located on opposite sides of the substrate. Therefore, there is a first coupling distance between the first matching element 234 and the first ground arm 224, there is a second coupling distance between the second matching element 235 and the second ground arm 225, and there is a third coupling distance between the third matching element 236 and the feeding portion 221. Preferably, the first coupling distance, the second coupling distance, and the third coupling distance are all less than 5 mm.

[0116] [Fifth embodiment]

[0117] See also Fig.11 As shown, Fig.11 Schematic diagram of the antenna structure of the fifth embodiment of the present invention. The antenna structure 2 of the fifth embodiment is similar to the fourth embodiment, and the similarities are not repeated here. The main difference is that in the fifth embodiment, the second parasitic radiator 24 of the antenna structure 2 is bent and has a multi-branch structure. Specifically, the second parasitic radiator 24 includes a first arm 241, a second arm 242, a third arm 243, a fourth arm 244 and a fifth arm 245. The first arm 241, the second arm 242, the third arm 243, the fourth arm 244 and the fifth arm 245 are bent in an S shape.

[0118] The first arm 241 is connected to the grounding element 21. The second arm 242 is connected between the first arm 241 and the third arm 243. The third arm 243 is connected between the second arm 242 and the fourth arm 244. The fourth arm 244 is connected between the third arm 243 and the fifth arm 245. The inductor element L is electrically connected between the first arm 241 and the fourth radiation portion 227. It should be noted that the components of the second parasitic radiation element 24 can be located on different surfaces of the substrate B. The type of the substrate B is as follows: Figure 3 and Figure 4 For example, the first arm 241, the second arm 242, the third arm 243 and the fourth arm 244 can be located on the same surface of the substrate B as the feeding radiation element 22, namely the second surface B2; the fifth arm 245 can extend along the side of the substrate B to another surface of the substrate B, namely the first surface B1.

[0119] The second parasitic radiation element 24 further includes a sixth arm 246. The sixth arm 246 is connected to the second arm 242. The sixth arm 246 and the third radiation portion 226 are coupled to each other to generate an operating frequency band including a frequency range of 5 to 6 GHz.

[0120] In the fifth embodiment, in addition to the different structure of the second parasitic radiating element 24, the structures of the feeding radiating element 22 and the first parasitic radiating element 23 are also slightly changed. The feeding radiating element 22 further includes a fifth radiating portion 228, and the fifth radiating portion 228 is connected to the second radiating portion 223. The fifth radiating portion 228 can be coupled with the fifth branch arm 245 to generate an operating frequency band including a frequency range of 1850-2690 MHz and 1427-1850 MHz.

[0121] In addition, the components of the feed radiation element 22 can be located on different surfaces of the substrate B. The type of the substrate B is as follows: Figure 3 and Figure 4 For example, the feeding portion 221, the first radiating portion 222, the second radiating portion 223, the first grounding arm 224, the second grounding arm 225, the third radiating portion 226 and the fourth radiating portion 227 are located on the second surface B2 of the substrate B, and the fifth radiating portion 228 is located on the first surface B1 of the substrate B.

[0122] Specifically, the fifth radiation portion 228 includes a first extension section 2281 and a second extension section 2282. The first extension section 2281 is connected between the second radiation portion 223 and the second extension section 2282. Fig.11As shown, the second extension section 2282 extends along an extension direction relative to the first extension section 2281, and the first extension section 2281 and the second extension section 2282 each have a longitudinal width perpendicular to the extension direction, and the longitudinal width of the first extension section 2281 is greater than the longitudinal width of the second extension section 2282. Thus, the present invention can further adjust the impedance matching of the antenna structure 2 by increasing the longitudinal width of the first extension section 2281.

[0123] In addition, the first parasitic radiation element 23 includes a first branch 231, a second branch 232 and a matching element 237. The first branch 231 is connected between the ground element 21 and the second branch 232. The matching element 237 is disposed on the second branch 232. The matching element 237 is coupled with the first radiation portion 22 to adjust the frequency deviation and matching of the low frequency band (617 MHz to 960 MHz).

[0124] [Beneficial Effects of Embodiments]

[0125] The electronic device D and the antenna structure 2 provided by the present invention can make the operating frequency band generated by the antenna structure 2 cover the low frequency range of 617 MHz to 960 MHz through the design of the first ground arm 224 and the second ground arm 225 in conjunction with the switching circuit S.

[0126] Furthermore, by designing the antenna structure 2 of the present invention, the low-frequency operating band generated by the antenna structure 2 can include the LTE full-frequency (617-5925MHz) range including the low-frequency band (617MHz to 960MHz). In addition, when the antenna structure 2 switches the low frequency using the switching circuit S, the operating band of the mid-high frequency range does not change much, and good radiation efficiency can be maintained.

[0127] Furthermore, the antenna structure 2 can increase the diversity of signal coupling paths by switching multiple switches (first switch SW1, second switch SW2, third switch SW3, and fourth switch SW4) in the switching circuit S. The signal can pass through one of the multiple coupling paths, or pass through multiple coupling paths at the same time, thereby improving the adjustability of the antenna operating band and optimizing the antenna matching. Therefore, the antenna structure 2 of the present invention can be used as a main antenna and can adapt to more stringent antenna characteristic requirements.

[0128] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the claims of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention description and drawings are included in the scope of the claims of the present invention.

Claims

1. An electronic device, comprising: a housing; as well as An antenna structure is disposed in the housing, and includes: a grounding member; A feeding radiation element, the feeding radiation element comprising a feeding portion, a first radiation portion, a second radiation portion, a first ground arm and a second ground arm, the feeding portion is connected between the first radiation portion and the second radiation portion, the first ground arm and the second ground arm are connected to the first radiation portion; a switching circuit electrically connected to the first ground arm and the second ground arm; and a first parasitic radiation element, the first parasitic radiation element being connected to the ground element and mutually coupled with the feed radiation element; and A feeding element, the feeding element is used to feed a signal, the feeding element comprises a ground terminal and a feeding terminal, the ground terminal is electrically connected to the ground element, and the feeding terminal is electrically connected to the feeding portion; When the switching circuit is switched to a first mode, the signal passes through the first ground arm, and when the switching circuit is switched to a second mode, the signal passes through the second ground arm.

2. The electronic device according to claim 1, wherein: The transmission path length of the signal from the feeding end to the ground via the first grounding arm is greater than the transmission path length of the signal from the feeding end to the ground via the second grounding arm.

3. The electronic device according to claim 1, wherein: The switching circuit includes a first path and a second path, the first path has a first switching switch, and the second path has a second switching switch; when the switching circuit is switched to the first mode, the first switching switch is in an on state; when the switching circuit is switched to the second mode, the second switching switch is in an on state; the equivalent impedance of the first path is different from the equivalent impedance of the second path.

4. The electronic device according to claim 1, wherein: The switching circuit includes a plurality of switching switches. When the plurality of switching switches are all in a conducting state, the signal passes through the first grounding arm and the second grounding arm.

5. The electronic device as claimed in claim 4, wherein: When the multiple switching switches are all in the non-conducting state, the signal does not pass through the first ground arm and the second ground arm, and the operating frequency band generated by the antenna structure when the multiple switching switches are all in the conducting state is different from the operating frequency band generated by the antenna structure when the multiple switching switches are all in the non-conducting state.

6. The electronic device as claimed in claim 1, wherein: The feeding radiation element further includes a third radiation portion and a fourth radiation portion. The third radiation portion and the fourth radiation portion are connected to the feeding portion, and the fourth radiation portion is closer to the grounding element than the third radiation portion.

7. The electronic device as claimed in claim 6, wherein: The antenna structure further includes a second parasitic radiation element, which is connected between the ground element and the fourth radiation portion. The second parasitic radiation element and the third radiation portion are separated from each other and coupled to each other.

8. The electronic device as claimed in claim 7, wherein: The antenna structure also includes an inductor element and a capacitor element. The feed portion includes a first section and a second section. The first section is connected to the first radiation portion, and the second section is connected to the fourth radiation portion. The capacitor element is electrically connected between the first section and the second section, and the inductor element is electrically connected between the fourth radiation portion and the second parasitic radiation element.

9. The electronic device as claimed in claim 8, wherein: The second parasitic radiation element is bent and includes a first arm, a second arm, a third arm, a fourth arm and a fifth arm. The first arm is connected to the grounding element, the second arm is connected between the first arm and the third arm, the third arm is connected between the second arm and the fourth arm, the fourth arm is connected between the third arm and the fifth arm, and the inductor element is electrically connected between the first arm and the fourth radiation portion.

10. The electronic device according to claim 9, wherein: The second parasitic radiation element further includes a sixth arm, the sixth arm is connected to the second arm, and the sixth arm is coupled to the third radiation portion.

11. The electronic device according to claim 9, wherein: The feeding radiation element further includes a fifth radiation portion, the fifth radiation portion is connected to the second radiation portion, and the fifth radiation portion is coupled to the fifth branch arm.

12. The electronic device according to claim 11, wherein: The fifth radiating portion includes a first extension segment and a second extension segment, the first extension segment is connected between the second radiating portion and the second extension segment; wherein the second extension segment extends along an extension direction relative to the first extension segment, the first extension segment and the second extension segment each have a longitudinal width perpendicular to the extension direction, and the longitudinal width of the first extension segment is greater than the longitudinal width of the second extension segment.

13. The electronic device according to claim 12, wherein: The first parasitic radiation element includes a first branch, a second branch and a matching element. The first branch is connected between the grounding element and the second branch. The matching element is arranged in the second branch. The matching element is coupled with the first radiation portion.

14. The electronic device according to claim 1, wherein: The first parasitic radiation element includes a first branch and a second branch connected to each other, and the first branch is connected between the ground element and the second branch.

15. The electronic device as claimed in claim 14, wherein: The first parasitic radiation element also includes a third branch, a first matching element, a second matching element and a third matching element. The third branch is connected to the second branch. The first matching element and the second matching element are arranged in the second branch. The third matching element is arranged in the third branch. The first matching element is coupled to the first ground arm, the second matching element is coupled to the second ground arm, and the third matching element is coupled to the feeding portion.

16. The electronic device as claimed in claim 1, further comprising a proximity sensing circuit electrically connected to the first ground arm or the second ground arm, and the antenna structure further comprising a first inductor element and at least one capacitor element; wherein, The first inductor is electrically connected between the proximity sensing circuit and the first ground arm, or between the proximity sensing circuit and the second ground arm; wherein the at least one capacitive element is electrically connected between the first ground arm and the second ground arm and the grounding member.

17. The electronic device as claimed in claim 16, wherein: The antenna structure also includes another capacitor element. The feeding portion includes a first section and a second section. The first section is connected to the first radiation portion. The second section is electrically connected to the feeding portion. The other capacitor element is electrically connected between the first section and the second section.

18. An antenna structure, comprising: a grounding member; A feeding radiation element, the feeding radiation element comprising a feeding portion, a first radiation portion, a second radiation portion, a first ground arm and a second ground arm, the feeding portion is connected between the first radiation portion and the second radiation portion, the first ground arm and the second ground arm are connected to the first radiation portion; a switching circuit electrically connected to the first grounding arm and the second grounding arm; as well as a first parasitic radiation element, the first parasitic radiation element being connected to the ground element and mutually coupled with the feed radiation element; The feeding portion is used to feed a signal through a feeding component. When the switching circuit is switched to a first mode, the signal passes through the first ground arm, and when the switching circuit is switched to a second mode, the signal passes through the second ground arm.

19. The antenna structure according to claim 18, wherein: The transmission path length of the signal from the feeding element to the ground via the first ground arm is greater than the transmission path length of the signal from the feeding element to the ground via the second ground arm.

20. The antenna structure of claim 18, wherein: The switching circuit includes a first path and a second path, the first path has a first switching switch, and the second path has a second switching switch; when the switching circuit is switched to the first mode, the first switching switch is in an on state; when the switching circuit is switched to the second mode, the second switching switch is in an on state; the equivalent impedance of the first path is different from the equivalent impedance of the second path.

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