CN117559118A - Antenna structure and electronic device - Google Patents

Abstract

An antenna structure and an electronic device. The antenna structure comprises a substrate, a first radiation piece, a second radiation piece, a grounding piece and a feed-in piece; the substrate is provided with a first surface and a second surface which are opposite; the first radiation piece comprises a first radiation part, a second radiation part, a third radiation part, a feed-in part and a grounding part; the first radiation part, the feed-in part and the grounding part are arranged on the first surface, and the feed-in part and the grounding part are connected with the first radiation part; the second radiation part and the third radiation part are arranged on the second surface and are connected with the first radiation part; the projection area of the second radiation part projected on the first surface is partially overlapped with the feed-in part; the projection area of the third radiation part projected on the first surface is partially overlapped with the grounding part; the second radiating element and the first radiating part are separated from each other and are coupled with each other; the grounding piece is connected to the grounding part; the signal end of the feed-in piece is connected with the feed-in part, and the grounding end of the feed-in piece is connected with the grounding piece. The invention can increase the bandwidth of the antenna and improve the efficiency of the antenna.

Description

Antenna structure and electronic device

Technical Field

The present invention relates to an antenna structure and an electronic device, and more particularly, to an antenna structure and an electronic device having an operating band applied to a fifth generation mobile communication technology.

Background

Existing electronic products, such as notebook computers and tablet computers, have a trend toward a light and thin design. However, with the development of the fifth generation mobile communication technology (5th Generation Mobile Networks,5G), the space available for accommodating the antenna in the existing electronic product is insufficient, so that the designed antenna structure has a problem of insufficient bandwidth.

In view of this, how to overcome the above-mentioned drawbacks by improving the antenna structure design has become one of the important issues to be solved by this technology.

Therefore, it is desirable to provide an antenna structure and an electronic device for solving the above-mentioned problems.

Disclosure of Invention

The invention mainly provides an antenna structure and an electronic device, which are used for solving the technical problem that the antenna structure has insufficient bandwidth due to the fact that the space for accommodating an antenna is insufficient in the existing electronic product.

In order to solve the above-mentioned problems, one of the technical solutions adopted by the present invention is to provide an antenna structure, which includes a substrate, a first radiating element, a second radiating element, a grounding element and a feeding element. The substrate is provided with a first surface and a second surface which are opposite. The first radiating element is arranged on the substrate. The first radiating element comprises a first radiating part, a feed-in part, a second radiating part, a grounding part and a third radiating part. The first radiation part is arranged on the first surface. The feed-in part is arranged on the first surface and is connected with the first radiation part. The second radiation part is arranged on the second surface. The second radiation part is connected with the first radiation part, and the projection area of the second radiation part projected on the first surface is partially overlapped with the feed-in part. The grounding part is arranged on the first surface. The grounding part is connected to the first radiation part. The third radiation part is arranged on the second surface. The third radiation part is connected to the first radiation part, and the projection area of the third radiation part projected on the first surface is partially overlapped with the grounding part. The second radiating element is arranged on the substrate, and the second radiating element and the first radiating part are separated from each other and are mutually coupled. The grounding piece is connected to the grounding part. A signal end of the feed-in piece is connected with the feed-in part, and a grounding end of the feed-in piece is connected with the grounding piece.

In order to solve the above-mentioned problems, another technical solution adopted by the present invention is to provide an electronic device, which includes a housing and an antenna structure. The antenna structure is disposed in the housing. The antenna structure comprises a substrate, a first radiating element, a second radiating element, a grounding element and a feed-in element. The substrate is provided with a first surface and a second surface which are opposite. The first radiating element is arranged on the substrate. The first radiating element comprises a first radiating part, a second radiating part, a third radiating part, a feed-in part and a grounding part. The first radiation part, the feed-in part and the grounding part are arranged on the first surface, and the feed-in part and the grounding part are connected to the first radiation part. The second radiation part and the third radiation part are arranged on the second surface and are connected with the first radiation part. The projection area of the second radiation part projected on the first surface is partially overlapped with the feed-in part. The projection area of the third radiation part projected on the first surface is partially overlapped with the grounding part. The second radiating element is arranged on the substrate. The second radiating element and the first radiating portion are separated from each other and coupled to each other. The grounding piece is connected to the grounding part. A signal end of the feed-in piece is connected with the feed-in part, and a grounding end of the feed-in piece is connected with the grounding piece.

The antenna structure and the electronic device provided by the invention have the beneficial effects that the bandwidth of the antenna structure in the electronic device can be increased by the technical scheme that the second radiating element and the first radiating part are separated from each other and are mutually coupled, the projection area of the second radiating part projected on the first surface is partially overlapped with the feed-in part, and the projection area of the third radiating part projected on the first surface is partially overlapped with the grounding part, so that the problem of insufficient bandwidth of the antenna structure in the prior art is solved.

For a further understanding of the nature and the technical aspects of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are provided for purposes of reference only and are not intended to limit the invention.

Drawings

Fig. 1 is a schematic perspective view of an electronic device according to the present invention.

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

Fig. 3 is a schematic perspective view of an antenna structure of the present invention.

Fig. 4 is a schematic diagram of a second radiator and a switching circuit of the antenna structure of the present invention.

Fig. 5 is a schematic diagram of gain curves of the antenna structure according to the present invention in different operation modes.

Description of main reference numerals:

d electronic device

H shell

T-shaped antenna structure

S substrate

S1 first surface

S2 second surface

S3 third surface

1. First radiating element

11. A first radiation part

12. A second radiation part

121. First end

122. Second end

13. A third radiation part

131. First end

132. Second end

14. Feed-in part

141. First section

142. Second section

143. Third section

15. Grounding part

151. Fourth section

152. Fifth section

153. Sixth section

2. Second radiating element

21. First support arm

22. Second support arm

3. Grounding piece

4. Feed-in piece

41. Signal terminal

42. Grounding end

5. First capacitive element

6. Second capacitive element

7. Switching circuit

8. Proximity sensing circuit

9. Inductance element

P integration module

P1 and P2 pins

R control circuit

G metal piece

L1, L2, L3, L4 coupling length

E1 First passive element

E2 Second passive element

E3 Third passive element

W signal conduction path

W1 first path

W2 second path

W3 third path

SW1 first switch

SW2 second change-over switch

SW3 third switch

M1, M2, M3, M4 curves

Detailed Description

The following specific embodiments are described in order to explain the present invention, and a person skilled in the art will be able to appreciate the advantages and effects of the present invention from the disclosure of the present invention. The invention is capable of other and different embodiments and its several details are capable of modification and variation in various respects, all from the point of view and application, all without departing from the spirit of the present invention. The drawings of the present invention are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention. In addition, it should be understood that, although terms such as "first," "second," "third," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used primarily to distinguish one element from another element. In addition, the term "or" as used herein shall include any one or combination of more of the associated listed items as the case may be. In addition, "connection" in the present invention is that there is a physical connection between two elements and is a direct connection or an indirect connection, and "coupling" in the present invention is that there is no physical connection between two elements but the electric field energy (electric field energy) generated by the current of one element excites the electric field energy of the other element.

Examples (example)

Referring to fig. 1 and 2, fig. 1 is a schematic perspective view of an electronic device according to the present invention, and fig. 2 is a schematic view of an antenna structure according to the present invention. The invention provides an electronic device D, which comprises a shell H and an antenna structure T arranged in the shell H. The electronic device D may be, for example, a notebook computer, which is not limited to the present invention. In the present invention, the antenna structure T mainly provides an operation frequency band with a frequency range between 617MHz to 960MHz, 1427MHz to 2690MHz, and 3000MHz to 6000 MHz.

Referring to fig. 2 and 3, fig. 3 is a schematic perspective view of an antenna structure according to the present invention. The antenna structure T comprises a substrate S, a first radiating element 1, a second radiating element 2, a grounding element 3 and a feeding element 4. The first radiating element 1, the second radiating element 2, the grounding element 3 and the feeding element 4 are all disposed on the substrate S. For example, the substrate S may be an FR4 (frame reflector 4) substrate, a printed circuit board (Printed Circuit Board, PCB) or a flexible printed circuit board (Flexible Printed Circuit Board, FPCB), the first radiating element 1, the second radiating element 2 and the grounding element 3 may be a metal sheet, a metal wire or other conductive conductor, and the feeding element 4 may be a Coaxial cable (coax cable), but the invention is not limited thereto.

The substrate S has a first surface S1 and a second surface S2 opposite to each other, and a third surface S3 connected between the first surface S1 and the second surface S2. The first radiating element 1 comprises a first radiating portion 11, a second radiating portion 12, a third radiating portion 13, a feeding portion 14 and a grounding portion 15. In the first radiating element 1, the first radiating portion 11, the feeding portion 14 and the grounding portion 15 are disposed on the first surface S1, and the second radiating portion 12 and the third radiating portion 13 are disposed on the second surface S2. As shown in fig. 3, in the present embodiment, the first ends 121 and 131 of the second radiating portion 12 and the third radiating portion 13 are connected to the first radiating portion 11, and the second ends 122 and 132 of the second radiating portion 12 and the third radiating portion 13 extend along the third surface S3 in the negative Z-axis direction, and then turn and extend along the second surface S2 in the positive Y-axis direction. However, the above examples are only one possible embodiment and are not intended to limit the present invention. In other embodiments, the second radiation portion 12 and the third radiation portion 13 located on the second surface S2 may be electrically connected to the first radiation portion 11 located on the first surface S1 by penetrating the substrate S through the conductive via. Therefore, as shown in fig. 2, the projection area of the second radiation portion 12 projected on the first surface S1 is partially overlapped with the feeding portion 14. The projection area of the third radiation portion 13 projected on the first surface S1 partially overlaps the ground portion 15.

The second radiator 2 is disposed on the substrate S, and the position of the second radiator 2 on the substrate S is not limited in the present invention. The second radiator 2 may be disposed on the first surface S1 or the second surface S2. In the embodiment of the invention, the second radiator 2 is arranged on the first surface S1. The grounding member 3 is connected to the grounding portion 15. The grounding element 3 may be electrically connected to a metal element G, and the metal element G may be a part of the housing H of the electronic device D, but the invention is not limited thereto. The feeding element 4 has a signal end 41 and a grounding end 42, the signal end 41 is connected to the feeding element 14, and the grounding end 42 is connected to the grounding element 3.

The feeding element 14 includes a first section 141, a second section 142 and a third section 143. The first section 141 is connected to the first radiating portion 11. The third section 143 is connected to the feeding member 4, and one end of the second section 142 is connected between the first section 141 and the third section 143. Thus, the projection area of the second radiation portion 12 projected on the first surface S1 is overlapped with the second section 142 of the feeding portion 14. In addition, the antenna structure T further includes a first capacitive element 5, and the first capacitive element 5 is electrically connected between the first section 141 and the third section 143. Preferably, the capacitance value of the first capacitive element 5 is 56pF.

The grounding portion 15 includes a fourth section 151, a fifth section 152 and a sixth section 153. The fourth section 151 is connected to the first radiating portion 11. The sixth section 153 is connected to the ground 3. The fifth section 152 is connected between the fourth section 151 and the sixth section 153. Thus, specifically, the projected area of the third radiation portion 13 projected on the first surface S1 partially overlaps the fifth section 152 of the ground portion 15. In addition, the antenna structure T further includes a second capacitive element 6, and the second capacitive element 6 is electrically connected between the fifth section 152 and the sixth section 153. Preferably, the capacitance value of the second capacitive element 6 is 56pF.

With continued reference to fig. 2, the second radiating element 2 includes a first arm 21 and a second arm 22 coupled to the first arm 21. The first arm 21 is coupled to the first radiating portion 11 to generate a first operating frequency band having a frequency range between 617MHz and 916 MHz. The second radiating portion 12 is coupled to the second section 142 of the feeding portion 14 to generate a second operating frequency band with a frequency range between 4200MHz and 5000MHz, and the second operating frequency band is higher than the first operating frequency band. The third radiating portion 13 is coupled to the fifth section 152 of the grounding portion 15 to generate a third operating frequency band having a frequency range between 5000MHz and 6000MHz, and the third operating frequency band is higher than the second operating frequency band.

As mentioned above, the coupling length L1 of the first arm 21 and the first radiating portion 11 is equal to 1/16 wavelength of a center frequency of the first operating frequency band. The coupling length L2 of the second radiating portion 12 and the coupling length L3 of the second section 142 are equal to 1/4 wavelength of a center frequency of the second operating band. The coupling length L4 of the third radiating portion 13 is equal to 1/4 wavelength of a center frequency of the third operating band. It should be noted that, the "coupling length" referred to herein does not refer to the length of the element, but refers to the effective length of a portion of the element for generating the coupling effect.

In addition, it should be noted that, since the feeding portion 14 and the grounding portion 15 are disposed on the first surface S1 of the substrate S, and the second radiating portion 12 and the third radiating portion 13 are disposed on the second surface S2 of the substrate S, the coupling amount between the second radiating portion 12 and the second section 142 and the coupling amount between the third radiating portion 13 and the fifth section 152 are related to the thickness of the substrate S (i.e. the distance between the first surface S1 and the second surface S2). In the present invention, the thickness range of the substrate S is less than 3mm, preferably 1.5mm.

In addition, the antenna structure T further includes a switching circuit 7, a proximity sensing circuit 8, and an inductance element 9. The switching circuit 7 is electrically connected to the second arm 22. The inductance element 9 is connected in series between the fifth section 152 of the grounding portion 15 and the proximity sensing circuit 8. Preferably, the inductance value of the inductance element 9 is 33nH.

As shown in fig. 2, the switching circuit 7 is a part of the multifunctional integrated module P, and the first radiating element 1 is electrically connected to one of the pins P1 of the integrated module P through the grounding portion 15, and then electrically connected to the proximity sensing circuit 8 through the pin P1. In addition, the second radiating element 2 is electrically connected to the other pin P2 of the integrated module P through the second arm 22, and then electrically connected to the switching circuit 7 through the pin P2.

Referring to fig. 4, fig. 4 is a schematic diagram of a second radiator and a switching circuit of the antenna structure of the present invention. The switching circuit 7 includes a signal conducting path W and at least one transmission path, and the signal conducting path W and the at least one transmission path respectively correspond to a plurality of operation modes. The signal conducting path W is not connected in series with the passive element, and at least one transmission path is connected in series with at least one passive element respectively. For example, the at least one transmission path in the present embodiment is a plurality of transmission paths, and the transmission paths may be the first path W1, the second path W2, and the third path W3 in fig. 4. One end of the signal conducting path W is electrically connected to the second arm 22 of the second radiating element 2, and the other end of the signal conducting path W is electrically connected to the control circuit R. The first path W1, the second path W2 and the third path W3 are electrically connected to the signal conducting path W, but the number of transmission paths is not limited in the present invention. The first path W1 is connected in series with the first passive element E1 and the first switch SW1, the second path W2 is connected in series with the second passive element E2 and the second switch SW2, and the third path W3 is connected in series with the third passive element E3 and the third switch SW3. In addition, in the present invention, the first passive element E1, the second passive element E2 and the third passive element E3 may be inductors, capacitors or resistors, which is not limited to the present invention. In the embodiment of the present invention, the first passive element E1, the second passive element E2 and the third passive element E3 are all exemplified by capacitors, and the capacitance values of the three are 47pF, 56pF and 68pF, respectively. Therefore, the electronic device D can adjust the operating frequency band, impedance matching and/or radiation efficiency of the antenna structure T by using the arrangement of the first passive element E1, the second passive element E2 and the third passive element E3.

With continued reference to fig. 4, in the present invention, the switching circuit 7 may include four operation modes, namely, a first mode, a second mode, a third mode and a fourth mode. The electronic device D may further include a control circuit R. The control circuit R can control the switching circuit 7 to switch in one of a plurality of modes to adjust the operating frequency band of the antenna structure T. Specifically, the first mode is that the second radiating element 2 is electrically connected to the control circuit R through the signal conducting path W, and at this time, the first to third switches SW1 to SW3 respectively located on the first to third paths W1 to W3 are in a non-conductive state. The second mode is that the second radiating element 2 is grounded through the first path W1, at this time, the first switch SW1 located on the first path W1 is in a conductive state, and the second switch and the third switch SW2 and SW3 located on the second path and the third path W2 and W3 respectively are in a non-conductive state. The third mode is that the second radiating element 2 is grounded through the second path W2, at this time, the second switch SW2 located in the second path W2 is in a conductive state, and the first switch and the third switch SW1 and SW3 located on the first path and the third paths W1 and W3 respectively are in a non-conductive state. The fourth mode is that the second radiating element 2 is grounded through the third path W3, and at this time, the third switch SW3 located in the third path W3 is in a conductive state, and the first and second switches SW1 and SW2 located in the first and second paths W1 and W2, respectively, are in a non-conductive state.

Referring to fig. 4 and 5, fig. 5 is a schematic diagram of gain curves of the antenna structure according to the present invention in different operation modes. The curve M1 in fig. 5 is a gain curve of the electronic device D in the first mode, the curve M2 is a gain curve of the electronic device D in the second mode (with the first passive element E1 having a capacitance value of 68 pF), the curve M3 is a gain curve of the electronic device D in the third mode (with the second passive element E2 having a capacitance value of 47 pF), and the curve M4 is a gain curve of the electronic device D in the fourth mode (with the third passive element E3 having a capacitance value of 56 pF). For example, when the switching circuit 7 is switched to a first mode, the operating band generated by the antenna structure T has a first center frequency. When the switching circuit 7 is switched to a second mode, the operating band generated by the antenna structure T has a second center frequency. The first center frequency is different from the second center frequency. Therefore, the present invention adjusts the center frequency of the first operating band by switching different transmission paths (signal transmission path W, first path W1, second path W2 and third path W3) respectively matching with different capacitors (47 pF-68 pF) by the switching circuit 7, so that the first operating band is increased in bandwidth from 617MHz to 698MHz, and the entire frequency range of the first operating band is between 617MHz to 960MHz.

In addition, the present invention regards the second radiating element 2 as a sensing electrode (Sensor pad) through the arrangement of the proximity sensing circuit 8, so that the proximity sensing circuit 8 measures the distance between the object (e.g. the leg or other portion of the user) and the antenna structure T. Therefore, the electronic device D can have a function of sensing whether the human body approaches the antenna structure T, so as to adjust the radiation power of the antenna structure T, and avoid the problem of excessively high specific absorption rate (Specific Absorption Rate, SAR) of the specific absorption rate of electromagnetic wave energy per unit mass of the living body.

Advantageous effects of the embodiment

The first support arm 21 of the second radiating element 2 and the first radiating portion 11 are separated from each other and are mutually coupled to generate a first operation frequency band with a frequency range between 617MHz and 916MHz, and the first operation frequency band is matched with the optimal design of a matching circuit consisting of the first capacitive element 5, the second capacitive element 6 and the inductive element 9, and different operation modes are switched in the switching circuit 7 in the integrated module P, so that the effects of increasing the bandwidth of the antenna and improving the efficiency of the antenna are achieved, and the problem that the bandwidth of the antenna structure in a low frequency range in the prior art is insufficient is solved.

Furthermore, the present invention generates a second operating frequency band with a frequency range between 4200MHz and 5000MHz by coupling the second radiating portion 12 with the second section 142 of the feeding portion 14, and generates a third operating frequency band with a frequency range between 5000MHz and 6000MHz by coupling the third radiating portion 13 with the fifth section 152 of the grounding portion 15. In addition, since the feeding portion 14 and the grounding portion 15 are disposed on the first surface S1 of the substrate S, and the second radiating portion 12 and the third radiating portion 13 are disposed on the second surface S2 of the substrate S, the thickness of the substrate S can be adjusted to achieve effective coupling matching.

The above disclosure is only a preferred embodiment of the present invention and is not intended to limit the scope of the claims, so that all equivalent technical variations made by the present description and drawings are included in the scope of the claims.

Claims (19)

1. An antenna structure, the antenna structure comprising:

a substrate having a first surface and a second surface opposite to each other;

the first radiation piece is arranged on the substrate and comprises:

the first radiation part is arranged on the first surface;

the feed-in part is arranged on the first surface and is connected with the first radiation part;

the second radiation part is arranged on the second surface, is connected with the first radiation part, and the projection area of the second radiation part projected on the first surface is partially overlapped with the feed-in part;

the grounding part is arranged on the first surface and is connected with the first radiation part; and

the third radiation part is arranged on the second surface, is connected with the first radiation part, and the projection area of the third radiation part projected on the first surface is partially overlapped with the grounding part;

the second radiation piece is arranged on the substrate, and the second radiation piece and the first radiation part are separated from each other and are coupled with each other;

the grounding piece is connected to the grounding part; and

the feed-in piece is provided with a signal end and a grounding end, the signal end is connected with the feed-in part, and the grounding end is connected with the grounding piece.

2. The antenna structure of claim 1, wherein the feed-in portion comprises a first section, a second section and a third section, the first section is connected to the first radiating portion, the third section is connected to the feed-in member, and one end of the second section is connected between the first section and the third section; the projection area of the second radiation part projected on the first surface is partially overlapped with the second section.

3. The antenna structure of claim 2, further comprising a first capacitive element electrically connected between the first section and the third section.

4. The antenna structure of claim 2, wherein the ground portion comprises a fourth section, a fifth section and a sixth section, the fourth section is connected to the first radiating portion, the sixth section is connected to the ground member, and the fifth section is connected between the fourth section and the sixth section; the projection area of the third radiation part projected on the first surface is partially overlapped with the fifth section.

5. The antenna structure of claim 4, further comprising a second capacitive element electrically connected between the fifth section and the sixth section.

6. The antenna structure of claim 4, wherein the second radiating element comprises a first arm and a second arm connected to the first arm, the first arm is coupled to the first radiating portion to generate a first operating band, and a coupling length of the first arm and the first radiating portion is equal to 1/16 wavelength of a center frequency of the first operating band.

7. The antenna structure of claim 6, further comprising a switching circuit electrically connected to the second arm, the switching circuit including a plurality of modes of operation, the switching circuit being configured to adjust the bandwidth of the first operating band by switching to different modes of operation.

8. The antenna structure of claim 7, wherein the switching circuit comprises a signal conducting path and at least one transmission path, wherein one end of the signal conducting path is electrically connected to the second arm, the other end of the signal conducting path is electrically connected to a control circuit, and the at least one transmission path is electrically connected to the signal conducting path; the signal conduction path and the at least one transmission path respectively correspond to a plurality of operation modes, and the at least one transmission path is respectively connected with at least one passive element in series; wherein the at least one passive element is a capacitor, and the capacitance of the capacitor is 47pF to 68pF.

9. The antenna structure of claim 6, wherein the second radiating portion is coupled to the second section of the feeding portion to generate a second operating band, and the second operating band is higher than the first operating band; wherein the coupling length of the second radiating portion and the second section is equal to 1/4 wavelength of a center frequency of the second operating band.

10. The antenna structure of claim 9, wherein the third radiating portion is coupled to the fifth section of the ground portion to generate a third operating band, and the third operating band is higher than the second operating band; wherein the coupling length of the third radiating portion is equal to 1/4 wavelength of a center frequency of the third operating frequency band.

11. The antenna structure of claim 1, further comprising a proximity sensing circuit and an inductive element connected in series between the ground and the proximity sensing circuit.

12. An electronic device, the electronic device comprising:

a housing; and

an antenna structure disposed in the housing, the antenna structure comprising:

a substrate having a first surface and a second surface opposite to each other;

the first radiation piece is arranged on the substrate, and comprises a first radiation part, a second radiation part, a third radiation part, a feed-in part and a grounding part, wherein the first radiation part, the feed-in part and the grounding part are arranged on the first surface, the feed-in part and the grounding part are connected with the first radiation part, the second radiation part and the third radiation part are arranged on the second surface, the second radiation part and the third radiation part are connected with the first radiation part, the projection area of the second radiation part projected on the first surface is partially overlapped with the feed-in part, and the projection area of the third radiation part projected on the first surface is partially overlapped with the grounding part;

the second radiation piece is arranged on the substrate, and the second radiation piece and the first radiation part are separated from each other and are coupled with each other;

the grounding piece is connected to the grounding part; and

the feed-in piece is provided with a signal end and a grounding end, the signal end is connected with the feed-in part, and the grounding end is connected with the grounding piece.

13. The electronic device of claim 12, wherein the feeding portion comprises a first section, a second section and a third section, the first section is electrically connected to the first radiating portion, the third section is connected to the feeding member, and one end of the second section is electrically connected between the first section and the third section; the projection area of the second radiation part projected on the first surface is partially overlapped with the second section.

14. The electronic device of claim 13, further comprising a first capacitive element electrically connected between the first section and the third section.

15. The electronic device of claim 13, wherein the grounding portion comprises a fourth section, a fifth section and a sixth section, the fourth section is connected to the first radiating portion, the sixth section is connected to the grounding member, and the fifth section is connected between the fourth section and the sixth section; the projection area of the third radiation part projected on the first surface is partially overlapped with the fifth section.

16. The electronic device of claim 15, further comprising a second capacitive element electrically connected between the fifth section and the sixth section.

17. The electronic device of claim 15, wherein the second radiating element comprises a first arm and a second arm connected to the first arm, the first arm is coupled to the first radiating portion to generate a first operating band, and a coupling length of the first arm and the first radiating portion is 1/16 wavelength of a center frequency of the first operating band; the second radiation part is coupled with the second section of the feed-in part to generate a second operation frequency band which is higher than the first operation frequency band; wherein, the coupling length of the second radiation part and the second section is 1/4 wavelength of a center frequency of the second operation frequency band; the third radiating part is coupled with the fifth section of the grounding part to generate a third operating frequency band, and the third operating frequency band is higher than the second operating frequency band; the coupling length of the third radiation part is 1/4 wavelength of a center frequency of the third operation frequency band.

18. The electronic device of claim 17, further comprising a switching circuit and a control circuit, wherein the switching circuit is electrically connected to the second arm, the switching circuit comprises a plurality of operation modes, and the switching circuit is used for adjusting the bandwidth of the first operation frequency band by switching to different operation modes, the switching circuit comprises a signal conduction path and a plurality of transmission paths, one end of the signal conduction path is electrically connected to the second arm, the other end of the signal conduction path is electrically connected to the control circuit, and the plurality of transmission paths are electrically connected to the signal conduction path; the signal conduction path and the transmission paths respectively correspond to a plurality of operation modes, and the transmission paths are respectively connected with a plurality of passive elements in series; the passive elements are capacitors, and the capacitance value of each capacitor is 47pF to 68pF.

19. The electronic device of claim 12, further comprising a proximity sensing circuit and an inductive element connected in series between the ground and the proximity sensing circuit.