CN107645041B - Antenna structure and wireless communication device with same - Google Patents

Abstract

The invention provides an antenna structure, which comprises a shell, a first grounding part, a second grounding part, a coupling part and a first feed-in source, wherein the shell comprises a front frame, a back plate and a frame, a slot is formed in the frame, a first gap and a first breakpoint are formed in the front frame, the slot, the first gap and the first breakpoint jointly divide a first antenna segment from the shell, one end of the first grounding part is electrically connected to the first antenna segment, the other end of the first grounding part is grounded, one end of the second grounding part is electrically connected to the first antenna segment, the other end of the second grounding part is grounded, the coupling part and the first antenna segment are arranged in a spaced coupling mode, and current from the first feed-in source is coupled to the first antenna segment through the coupling part. The back plate in the antenna structure forms an all-metal structure, and the influence on the integrity and the attractiveness of the back plate due to the arrangement of grooves, broken lines or breakpoints can be effectively avoided. The invention also provides a wireless communication device with the antenna structure.

Description

Antenna structure and wireless communication device with same

Technical Field

The invention relates to an antenna structure and a wireless communication device with the same.

Background

With the progress of wireless communication technology, wireless communication devices are increasingly being developed to be light and thin, and consumers have increasingly high requirements for product appearance. Since the metal housing has advantages in terms of appearance, mechanical strength, heat dissipation effect, etc., more and more manufacturers design wireless communication devices having metal housings, such as metal back plates, to meet the needs of consumers. However, the metal housing is likely to interfere with and shield signals radiated by the antenna disposed therein, and it is not easy to achieve a broadband design, resulting in poor radiation performance of the internal antenna. Furthermore, the back plate is usually provided with slots and breakpoints, which affect the integrity and the aesthetic property of the back plate.

Disclosure of Invention

In view of the above, it is desirable to provide an antenna structure and a wireless communication device having the same.

An antenna structure comprises a shell, a first grounding part, a second grounding part, a coupling part and a first feed-in source, wherein the shell comprises a front frame, a back plate and a frame, the frame is clamped between the front frame and the back plate, a slot is arranged on the frame, a first gap and a first breakpoint are arranged on the front frame, the first gap and the first breakpoint are communicated with the slot and extend to block the front frame, the slot, the first gap and the first breakpoint jointly divide a first antenna section from the shell, one end of the first grounding part is electrically connected to the first antenna section, the other end of the first grounding part is grounded, the second grounding part is arranged at an interval with the first grounding part, one end of the second grounding part is electrically connected to the first antenna section, the other end of the second grounding part is grounded, one end of the coupling part is electrically connected to the first feed-in source and is arranged at an interval with the first antenna section in a coupling way, the current from the first feed-in source is coupled to the first antenna segment through the coupling part.

A wireless communication device comprises the antenna structure.

The antenna structure and the wireless communication device with the antenna structure can cover low, medium and high frequencies of LTE-A, and the frequency range is wide. In addition, the slot, the first slot, the second slot, the first breakpoint and the second breakpoint on the shell of the antenna structure are all arranged on the front frame and the side frame and are not arranged on the back plate, so that the back plate forms an all-metal structure, namely, the back plate is not provided with insulated slots, broken lines or breakpoints, and the back plate can avoid the influence on the integrity and the attractiveness of the back plate due to the arrangement of the slot, the broken line or the breakpoint.

Drawings

Fig. 1 is a schematic diagram illustrating an antenna structure applied to a wireless communication device according to a first preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of the wireless communication device shown in fig. 1 from another angle.

Fig. 3 is an assembly diagram of the wireless communication device shown in fig. 1.

Fig. 4 is a schematic current flow diagram of the antenna structure shown in fig. 1.

Fig. 5 is a circuit diagram of the antenna structure shown in fig. 1 provided with a matching circuit.

Fig. 6 is a circuit diagram of the antenna structure shown in fig. 1, which is provided with a switching circuit and a filter circuit.

Fig. 7 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 5 when the first matching element is set to different inductance values.

Fig. 8 is a graph of the S-parameter (scattering parameter) of the antenna structure shown in fig. 5 when the second matching elements are set to different capacitance values.

Fig. 9 is a graph of S-parameter (scattering parameter) of the antenna structure shown in fig. 5 when the third matching element is set to a different inductance value.

Fig. 10 is a graph of S-parameter (scattering parameter) of the antenna structure shown in fig. 5 when the fourth matching element is set to a different inductance value.

Fig. 11 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 5 when the matching circuit sets specific inductance and capacitance.

Fig. 12 is a graph of radiation efficiency of the antenna structure shown in fig. 5 when the matching circuit is configured with a specific inductance and capacitance.

Fig. 13 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 6 when the first switching element is configured as an inductor with different inductance values and the second switching element is an inductor with an inductance value of 5 nH.

Fig. 14 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 6 when the first switching element is configured as an inductor with different inductance values and the second switching element is an inductor with an inductance value of 10 nH.

Fig. 15 is a graph of S-parameters (scattering parameters) of the antenna structure shown in fig. 6 when the first switching element is configured as an inductor with different inductance values and the second switching element is an inductor with an inductance value of 15 nH.

Fig. 16 is a graph of the S-parameter (scattering parameter) of the second antenna in the antenna structure of fig. 1.

Fig. 17 is a graph of the radiation efficiency of a second antenna in the antenna structure of fig. 1.

Fig. 18 is a graph of the total radiation efficiency of the second antenna in the antenna structure of fig. 1.

Fig. 19 is a schematic diagram of an antenna structure according to a second preferred embodiment of the present invention.

Fig. 20 is a circuit diagram of the antenna structure shown in fig. 19 provided with a matching circuit.

Fig. 21 is a circuit diagram of the antenna structure shown in fig. 19 provided with a switching circuit and a filter circuit.

Fig. 22 is a graph of the S-parameter (scattering parameter) of the first antenna in the antenna structure shown in fig. 19.

Fig. 23 is a graph of the radiation efficiency of the first antenna in the antenna structure of fig. 19.

Fig. 24 is a graph of the S-parameter (scattering parameter) of the second antenna in the antenna structure of fig. 19.

Fig. 25 is a graph of the radiation efficiency of the second antenna in the antenna structure of fig. 19.

Fig. 26 is a graph of the total radiation efficiency of the second antenna in the antenna structure of fig. 19.

Fig. 27 is a diagram illustrating an antenna structure applied to a wireless communication device according to a third preferred embodiment of the present invention.

Fig. 28 is a schematic diagram of the wireless communication device shown in fig. 27 from another angle.

Fig. 29 is an assembly diagram of the wireless communication device shown in fig. 27.

Fig. 30 is a schematic plan view of the antenna structure of fig. 27.

Fig. 31 is a schematic diagram of the current trend of the antenna structure shown in fig. 27 operating in the 734-960MHz frequency band and the 2500-2690MHz frequency band.

Fig. 32 is a schematic diagram of a current trend of the antenna structure shown in fig. 27 when the antenna structure operates in the 1805-2300MHz frequency band.

Fig. 33 is a circuit diagram of the antenna structure shown in fig. 27 provided with a matching circuit.

Fig. 34 is a graph of S-parameter (scattering parameter) of the antenna structure shown in fig. 33 when the first matching element is set to different inductance values.

Fig. 35 is a graph of the S-parameter (scattering parameter) of the antenna structure shown in fig. 33 when the second matching elements are set to different capacitance values.

Fig. 36 is a graph of S-parameter (scattering parameter) of the antenna structure shown in fig. 33 when the third matching element is set to a different inductance value.

Fig. 37 is a graph of the S-parameter (scattering parameter) of the antenna structure of fig. 27 operating in the low frequency mode.

Fig. 38 is a graph of S-parameters (scattering parameters) for the antenna structure of fig. 27 operating in medium and high frequency modes.

Fig. 39 is a graph of radiation efficiency for the antenna structure of fig. 27 operating in a low frequency mode.

Fig. 40 is a graph of the total radiation efficiency of the antenna structure of fig. 27 operating in the low frequency mode.

Fig. 41 is a graph of radiation efficiency for the antenna structure of fig. 27 operating in medium and high frequency modes.

Fig. 42 is a graph of the total radiation efficiency of the antenna structure of fig. 27 operating in the medium and high frequency modes.

Fig. 43a to 43h are schematic plan views of the antenna structure shown in fig. 27.

Fig. 44 is a diagram illustrating an antenna structure applied to a wireless communication device according to a fourth preferred embodiment of the invention.

Fig. 45 is a schematic view of the wireless communication device of fig. 44 from another angle.

Fig. 46 is an assembly diagram of the wireless communication device shown in fig. 44.

Fig. 47 is a schematic plan view of the antenna structure shown in fig. 44.

Fig. 48 is a schematic current flow diagram of the antenna structure shown in fig. 44.

Fig. 49 is a circuit diagram of the antenna structure shown in fig. 44 provided with a matching circuit.

Fig. 50 is a graph of the S-parameter (scattering parameter) of the antenna structure of fig. 44 when the extensions are of different lengths.

Fig. 51 is a graph of the S-parameter (scattering parameter) of the antenna structure shown in fig. 44 when the second matching elements are set to different capacitance values.

Fig. 52 is a graph of the S-parameter (scattering parameter) of the antenna structure shown in fig. 44 when the third matching elements are set to different capacitance values.

Fig. 53 is a graph of the S-parameter (scattering parameter) of the antenna structure shown in fig. 44.

Fig. 54 is a graph of the radiation efficiency of the antenna structure shown in fig. 44.

Fig. 55a to 55f are schematic plan views of the antenna structure shown in fig. 44.

Description of the main elements

Antenna structures 100, 100a, 300, 500

Case 11, 31, 51

Front frames 111, 311, 511

Back plates 112, 312, 512

Rims 113, 313, 513

Accommodating spaces 114, 314, 514

Accommodating space 525

Tip section 115, 315, 515

First side 116, 316, 516

Second side 117, 317, 517

First opening 118

Second opening 119

Slots 120, 320, 520

First slits 121, 321, 521

Second slits 122, 322, 522

First breakpoints 123, 323, 523

Second breakpoints 124, 324, 524

First antenna segment A1

Antenna segments E1, K1

First stage K11

Second section K12

The second antenna segment A2

First ground part 12

First ground segment G1

First connection section 126, J1

Second ground part 13

Second ground segment G2

Second connecting segment 131, J2

First ends T1, D1, H1

Second ends T2, D2, H2

Coupling part 14

First feed segment F1

First coupling section 141

Second coupling section 143

Parasitic part 15

Third ground segment G3

First parasitic segment 151

Second parasitic segment 153

First feed source S1

Second feed source S2

Signal feed sources 36, 56

First antenna ANT1

Second antenna ANT2

Antennae ANT3, ANT4

Radiating section 16

First radiation part 33

Second feed segment F2

Fourth ground segment G4

First radiation segments 161, 331

Second radiating section 163, 332

Third radiating section 333

Fourth radiation section 334

Fifth radiating section 335

First resonance part 53

First connecting arm Q1

First resonant section 531

Second resonance section 532

Second resonance part 54

Second connecting arm Q2

Resonance arm 541

Extension 55

First extension 551

Second extension 552

Matching circuits 17, 27, 37, 57

First matching elements 171, 271, 371, 571

Second matching element 172, 272, 372, 572

Third matching element 173, 273, 373, 573

Fourth matching element 177

Switching circuit 18

First switching element 181

Second switching element 183

Filter circuits 19 and 29

Inductor L1

First capacitor C1

Second capacitance C2

First inductance L2

Second inductance L3

Capacitor C3

Wireless communication device 200, 400, 600

Display unit 201, 401, 601

First electronic component 202, 402, 602

Second electronic component 203, 403, 603

Third electronic component 204, 404, 604

Fourth electronic component 205, 405, 605

Fifth electronic component 206, 406, 606

Vias 207, 208, 209, 407, 408, 409, 607, 608, 609

Second radiation part 34

First radiating arm 341

Second radiating arm 342

Third radiating arm 343

Fourth radiating arm 344

Fifth radiating arm 345

Third radiation part 35

Third connecting section J3

First resonant section 351

Second resonant section 352

Third resonant section 353

Fourth resonant section 354

Fifth resonant section 355

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "electrically connected" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "electrically connected" to another element, it can be connected by contact, e.g., by wires, or by contactless connection, e.g., by contactless coupling.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Examples 1 to 2

Referring to fig. 1, an antenna structure 100 for transmitting and receiving radio waves to transmit and exchange wireless signals in a wireless communication device 200 such as a mobile phone, a personal digital assistant, etc. is provided in a preferred embodiment of the present invention.

Referring to fig. 2, the antenna structure 100 includes a housing 11, a first ground portion 12, a second ground portion 13, a coupling portion 14, a parasitic portion 15, a radiation portion 16, a first feeding source S1, and a second feeding source S2. The housing 11 may be an outer shell of the wireless communication device 200. In the present embodiment, the housing 11 is made of a metal material. The housing 11 includes a front frame 111, a back plate 112 and a frame 113. The front frame 111, the back plate 112 and the frame 113 may be integrally formed. The front frame 111, the back plate 112, and the bezel 113 constitute a housing of the wireless communication device 200. The front frame 111 is provided with an opening (not shown) for accommodating the display unit 201 of the wireless communication device 200. It is understood that the display unit 201 has a display plane exposed in the opening and disposed substantially parallel to the back plate 112.

The back plate 112 is disposed opposite to the front frame 111. The back plate 112 is directly connected with the frame 113, and no gap is formed between the back plate 112 and the frame 113. The back plate 112 is equivalent to the ground of the antenna structure 100 and the wireless communication device 200.

The frame 113 is sandwiched between the front frame 111 and the back plate 112, and is respectively disposed around the peripheries of the front frame 111 and the back plate 112, so as to form an accommodating space 114 together with the display unit 201, the front frame 111, and the back plate 112. The accommodating space 114 is used for accommodating electronic components or circuit modules of the wireless communication device 200, such as a circuit board, a processing unit, and the like.

The frame 113 at least includes a terminal portion 115, a first side portion 116 and a second side portion 117. In this embodiment, the terminal part 115 is a bottom end of the wireless communication device 200. The terminal portion 115 connects the front frame 111 and the rear plate 112. The first side portion 116 and the second side portion 117 are disposed opposite to each other, and are disposed at both ends of the terminal portion 115, preferably, perpendicularly. The first side portion 116 and the second side portion 117 are also connected to the front frame 111 and the back plate 112.

The frame 113 is further provided with a first opening 118, a second opening 119 and a slot 120. The front frame 111 is provided with a first gap 121, a second gap 122, a first break point 123 and a second break point 124. The first opening 118 and the second opening 119 are opened on the terminal portion 115, and both are disposed at an interval and penetrate the terminal portion 115.

Referring to fig. 3, the wireless communication device 200 further includes at least one electronic component. In the present embodiment, the wireless communication device 200 includes a first electronic component 202, a second electronic component 203, a third electronic component 204, a fourth electronic component 205, and a fifth electronic component 206 (see fig. 3). The first electronic component 202 is a headset interface module disposed in the accommodating space 114 and adjacent to the first side 116. The first electronic component 202 corresponds to the first opening 118 such that the first electronic component 202 is partially exposed from the first opening 118. Thus, a user can insert a headset through the first opening 118 to establish electrical connection with the first electronic component 202.

The second electronic component 203 is a USB module disposed in the accommodating space 114 and located between the first electronic component 202 and the second side 117. The second electronic component 203 corresponds to the second opening 119, such that the second electronic component 203 is partially exposed from the second opening 119. Thus, a user can insert a USB device through the second opening 119 to establish electrical connection with the second electronic component 203. The third electronic component 204 and the fourth electronic component 205 are both rear camera modules. The fifth electronic component 206 is a flash lamp.

The back plate 112 is a single metal sheet formed integrally, and the back plate 112 is provided with through holes 207, 208, and 209 for exposing the dual-camera lens (i.e., the third electronic element 204 and the fourth electronic element 205) and the flash lamp (i.e., the fifth electronic element 206). The backplate 112 does not have any slots, breaks, or breaks provided thereon for separating the insulation of the backplate 112.

In the present embodiment, the slot 120 is disposed on the end portion 115, and is communicated with the first opening 118 and the second opening 119, and respectively extends to the first side portion 116 and the second side portion 117. It is understood that, in other embodiments, the slot 120 may be disposed on the end portion 115 only and not extend to any one of the first side portion 116 and the second side portion 117, or the slot 120 may be disposed on the end portion 115 and only extend to one of the first side portion 116 and the second side portion 117.

The first gap 121, the second gap 122, the first break point 123 and the second break point 124 are all communicated with the slot 120 and extend to block the front frame 111. In this embodiment, the first slit 121 is opened on the front frame 111 and is communicated with the first end T1 of the slot 120 disposed on the first side portion 116. The second slot 122 is opened on the front frame 111, and is communicated with the second end T2 of the slot 120 disposed on the second side 117. The first breaking point 123 and the second breaking point 124 are disposed on the front frame 111 between the first end T1 and the second end T2 at intervals, and are communicated with the slot 120. Thus, the slot 120, the first slot 121, the second slot 122, the first break point 123 and the second break point 124 together at least separate a first antenna segment a1 and a second antenna segment a2 from the housing 11. Wherein the front frame 111 between the first gap 121 and the first break point 123 constitutes the first antenna segment a 1. The front frame 111 between the second slot 122 and the second break point 124 constitutes the second antenna segment a 2. In this embodiment, the first break point 123 and the second break point 124 are respectively disposed at two sides of the second opening 119.

It is understood that, in the present embodiment, except for the positions of the first opening 118 and the second opening 119, the inside of the slot 120, the inside of the first gap 121, the inside of the second gap 122, the inside of the first break point 123 and the inside of the second break point 124 are all filled with insulating materials (for example, plastics, rubbers, glasses, woods, ceramics, etc., but not limited thereto).

It can be understood that, in the present embodiment, the slot 120 is opened at one end of the frame 113 close to the back plate 112 and extends to the front frame 111, so that the first antenna segment a1 and the second antenna segment a2 are completely formed by a part of the front frame 111. Of course, in other embodiments, the opening position of the slot 120 may also be adjusted according to specific requirements. For example, the slot 120 is opened at one end of the frame 113 close to the back plate 112 and extends toward the front frame 111, so that the first antenna segment a1 and the second antenna segment a2 are formed by a part of the front frame 111 and a part of the frame 113.

It can be understood that there are no other insulation slots, breaks or breakpoints on the lower half portions of the front frame 111 and the frame 113 except for the slots 120, the first slots 121, the second slots 122, the first breakpoints 123 and the second breakpoints 124, so that there are only the first slots 121, the second slots 122, the first breakpoints 123 and the second breakpoints 124 on the lower half portion of the front frame 111, and there are no other breakpoints.

It will be appreciated that in this embodiment the width of the slot 120 is approximately 3.43 mm. The widths of the first break point 123 and the second break point 124 are approximately 2 mm. The width of the first gap 121 and the second gap 122 is approximately 3.43 mm. The distance between the first break point 123 and the second break point 124 is approximately 11.1 mm.

The first grounding portion 12 is disposed on a side of the first electronic component 202 close to the first break point 123. The first ground portion 12 is substantially L-shaped, and includes a first ground section G1 and a first connection section 126. The first grounding segment G1 is substantially rectangular and disposed in a plane perpendicular to the back plate 112. One end of the first ground segment G1 is vertically connected to the first connection segment 126, and the other end is electrically connected to the back plate 112, i.e. grounded. The first connecting section 126 is substantially rectangular and disposed in a plane parallel to the back plate 112. One end of the first connecting segment 126 is perpendicularly connected to the end of the first grounding segment G1 away from the backplate 112, and the other end extends in a direction parallel to the first side portion 116 and close to the end portion 115 until being connected to the first antenna segment a1, so that the first antenna segment a1 is grounded through the first grounding portion 12.

The second grounding portion 13 is disposed on a side of the first electronic component 202 close to the first side portion 116. The second ground portion 13 is substantially L-shaped, and includes a second ground segment G2 and a second connection segment 131. The second grounding segment G2 is substantially rectangular and disposed in a plane perpendicular to the back plate 112. One end of the second ground segment G2 is electrically connected to the second connection segment 131, and the other end is electrically connected to the back plate 112, i.e. ground. The second connecting section 131 is substantially rectangular and is disposed in a plane parallel to the back plate 112. One end of the second connecting segment 131 is perpendicularly connected to the end of the second grounding segment G2 away from the backplate 112, and the other end extends in a direction parallel to the first side portion 116 and close to the terminal portion 115 until being connected to the first antenna segment a1, so that the first antenna segment a1 is grounded through the second grounding portion 13.

The first and second ground portions 12 and13 are close to the first opening 118. The first ground portion 12 and the second ground portion 13 are respectively disposed on two sides of the first opening 118.

The coupling portion 14 is electrically connected to the first feeding source S1 to form a monopole antenna. The coupling portion 14 includes a first feeding segment F1, a first coupling segment 141, and a second coupling segment 143. The first feeding segment F1 is disposed between the first electronic component 202 and the second electronic component 203. The first feeding segment F1 is substantially rectangular strip-shaped and is disposed in a plane perpendicular to the back plate 112. One end of the first feeding segment F1 is electrically connected to the first coupling segment 141, and the other end is electrically connected to the first feeding source S1 for feeding current to the coupling part 14.

The first coupling section 141 is substantially rectangular and disposed in a plane parallel to the back plate 112. One end of the first coupling segment 141 is perpendicularly connected to an end of the first feed segment F1 away from the first feed source S1, and the other end extends in a direction parallel to the first side portion 116 and close to the end portion 115. The second coupling section 143 is disposed coplanar with the first coupling section 141. The second coupling segment 143 is perpendicularly connected to the end of the first coupling segment 141 far from the first feeding segment F1, and extends along a direction parallel to the end portion 115 and close to the first side portion 116 and the second side portion 117, respectively, so as to form a T-shaped structure with the first coupling segment 141.

The parasitic portion 15 is a parasitic antenna. The parasitic portion 15 is disposed between the first coupling segment 141 and the second electronic element 203. The parasitic portion 15 includes a third grounding segment G3, a first parasitic segment 151, and a second parasitic segment 153. The third grounding segment G3 is substantially rectangular and disposed in a plane perpendicular to the back plate 112. One end of the third grounding segment G3 is vertically connected to the first parasitic segment 151, and the other end is electrically connected to the backplane 112, i.e. grounded. The first parasitic segment 151 is substantially rectangular and has one end perpendicularly connected to one end of the third grounding segment G3 away from the backplane 112, and the other end extending along a direction parallel to the second coupling segment 143 and close to the second electronic component 203 (i.e. a direction close to the second side 117). The second parasitic segment 153 is substantially rectangular and perpendicularly connected to an end of the first parasitic segment 151 away from the third grounding segment G3, and extends in a direction parallel to the first side portion 116 and away from the end portion 115.

Referring to fig. 4 and fig. 5, it can be understood that, in the present embodiment, the first antenna segment a1, the first ground portion 12, the second ground portion 13, the coupling portion 14 and the parasitic portion 15 together form a first antenna ANT1, which is used for exciting a first mode to generate a radiation signal of a first frequency band. In this embodiment, the first mode is an LTE-a medium-high frequency mode. The first frequency band is 1710-2690MHz frequency band. Specifically, referring to fig. 4, when a current enters from the first feeding source S1, the current flows into the coupling portion 14, and is coupled to the first antenna segment a1 through the coupling portion 14, so as to flow through the first antenna segment a1, and is grounded through the first ground portion 12 and the second ground portion 13, so that the coupling portion 14 and the first antenna segment a1 jointly excite the middle band of the first mode in a quarter wavelength manner, i.e., 1710-2300MHz band. Meanwhile, the coupling portion 14 and a portion of the first antenna segment a1 jointly excite the first high frequency band of the first mode in a quarter-wavelength manner, i.e. 2300 and 2400MHz frequency bands (please refer to path I1). In addition, when the current enters from the first feeding source S1, the current flows into the coupling portion 14, is coupled to the parasitic portion 15 through the coupling portion 14, and is grounded through the third grounding segment G3 of the parasitic portion 15 (please refer to path I2), so that the parasitic portion 15 excites the second high frequency band of the first mode in a quarter wavelength manner, i.e., the 2500-. Obviously, in the present embodiment, the parasitic portion 15 is mainly used to improve the bandwidth of the high frequency band of the first antenna ANT 1.

Referring to fig. 2 again, the radiation portion 16 is disposed entirely between the second electronic element 203 and the second side portion 117. The radiation part 16 includes a second feed segment F2, a fourth ground segment G4, a first radiation segment 161, and a second radiation segment 163. The second feeding segment F2 is substantially rectangular strip-shaped, and is disposed in a plane perpendicular to the back plate 112 and adjacent to the second side 117. One end of the second feeding segment F2 is electrically connected to the second feeding source S2, and the other end is electrically connected to the first radiation segment 161, for feeding current to the radiation part 16.

The fourth grounding segment G4 is substantially rectangular and disposed in a plane perpendicular to the backplane 112 and between the second feeding segment F2 and the second electronic component 203. One end of the fourth grounding segment G4 is electrically connected to the back plate 112, i.e. grounded, and the other end is electrically connected to the first radiating segment 161 to provide a ground for the radiating part 16.

The first radiating section 161 is substantially rectangular strip-shaped and is disposed in a plane parallel to the back plate 112. One end of the first radiating section 161 is perpendicularly connected to one end of the second feed section F2 away from the second feed source S2, and extends a distance in a direction parallel to the terminal portion 115 and close to the first side portion 116 to perpendicularly connect with one end of the fourth grounding section G4 away from the back plate 112, and then passes over the fourth grounding section G4 to continue to extend in a direction parallel to the terminal portion 115 and close to the first side portion 116. The second radiating section 163 is substantially in the shape of a rectangular bar, and is disposed coplanar with the first radiating section 161. One end of the second radiating segment 163 is perpendicularly connected to the end of the first radiating segment 161 away from the second feeding segment F2, and the other end extends in a direction parallel to the first side portion 116 and close to the end portion 115 until being electrically connected to the side of the second antenna segment a2 adjacent to the second break point 124.

Referring to fig. 4 and fig. 6 together, it can be understood that, in the present embodiment, the radiation portion 16 and the second antenna segment a2 form a second antenna ANT2 for exciting a second mode to generate a radiation signal of a second frequency band. The frequency of the first frequency band is higher than the frequency of the second frequency band. In this embodiment, the second antenna ANT2 is an inverted F antenna. The second mode is an LTE-A low-frequency mode, and the second frequency band is a 700-960MHz frequency band. Specifically, referring to fig. 4 again, after the current enters from the second feeding source S2, the current flows into the radiation portion 16, flows into the second antenna segment a2 through the radiation portion 16, flows through the second antenna segment a2, and is grounded through the fourth grounding segment G4 of the radiation portion 16 (see path I3), so as to excite the low-frequency mode to generate the radiation signal of 700-.

It is understood that referring again to fig. 5, in the present embodiment, the first antenna ANT1 forms a four-port network. The four ports include a first ground segment G1, a second ground segment G2, a third ground segment G3 and a first feeding segment F1, and corresponding matching elements are disposed at the ports to form corresponding matching circuits 17, so as to effectively adjust and optimize the bandwidth and impedance matching of the first antenna ANT 1. Specifically, in one embodiment, the matching circuit 17 includes a first matching element 171, a second matching element 172, a third matching element 173, and a fourth matching element 174. One end of the first matching element 171 is electrically connected to the first feed segment F1, and the other end is electrically connected to the first feed source S1. The other end of the first feeding source S1 is electrically connected to the back plate 112, i.e. grounded. One end of the second matching element 172 is electrically connected to the first grounding segment G1, and the other end is electrically connected to the back plate 112, i.e. grounded. One end of the third matching member 173 is electrically connected to the second ground segment G2, and the other end is electrically connected to the back plate 112, i.e., grounded. One end of the fourth matching element 174 is electrically connected to the third ground segment G3, and the other end is electrically connected to the backplate 112, i.e. grounded. In the present embodiment, the first matching element 171, the third matching element 173 and the fourth matching element 174 are all inductors. The second matching element 172 is a capacitor. Of course, in other embodiments, the first matching element 171, the second matching element 172, the third matching element 173 and the fourth matching element 174 are not limited to the above-mentioned inductance and capacitance, and may be other matching elements or combinations thereof.

It is understood that, referring again to fig. 6, in the present embodiment, the second antenna ANT2 forms a two-port network. The two ports include a second feeding segment F2 and a fourth grounding segment G4, and corresponding switching elements are disposed at the ports to form corresponding switching circuits 18, so as to effectively adjust the low-frequency mode of the second antenna ANT 2. Specifically, in one embodiment, the switching circuit 18 includes a first switching element 181 and a second switching element 183. One end of the first switching element 181 is electrically connected to the second feed segment F2, and the other end is electrically connected to the second feed source S2. The other end of the second feeding source S2 is electrically connected to the back plate 112, i.e. grounded. One end of the second switching element 183 is electrically connected to the fourth ground segment G4, and the other end is electrically connected to the back plate 112, i.e. to ground. In the present embodiment, the first switching element 181 and the second switching element 183 are both adjustable inductors, and both can be switched among a plurality of predetermined inductance values. Thus, by setting the inductance values of the adjustable first switching element 181 and the adjustable second switching element 183, the switching circuit 18 forms a dual-switching circuit, and the low-frequency mode of the second antenna ANT2 is effectively adjusted. It is understood that in other embodiments, the first switching element 181 and the second switching element 183 are not limited to the adjustable inductances, but may be other switching elements or combinations thereof, for example, the first switching element 181 and the second switching element 183 can be switched among a plurality of predetermined impedance values.

It is understood that in other embodiments, the second antenna ANT2 may further include a filter circuit 19. The filter circuit 19 is electrically connected between the first switching element 181 and the second feeding source S2, so as to effectively suppress a high-frequency harmonic mode, and further effectively improve the isolation between the first antenna ANT1 and the second antenna ANT 2. In one embodiment, the filter circuit 19 includes an inductor L1, a first capacitor C1, and a second capacitor C2. The inductor L1 is connected in series between the first switching element 181 and the second feeding source S2. One end of the first capacitor C1 is electrically connected between the inductor L1 and the second feed source S2, and the other end is electrically connected to the backplate 112, i.e., to ground. One end of the second capacitor C2 is electrically connected between the inductor L1 and the first switching element 181, and the other end is electrically connected to the back plate 112, i.e., grounded, so as to form a pi-type filter circuit with the inductor L1 and the first capacitor C1. In this embodiment, the inductance value of the inductor L1 is 9.1 nH. The capacitance values of the first capacitor C1 and the second capacitor C2 are both 4 pF.

It is understood that the backplate 112 can serve as a ground for the antenna structure 100 and the wireless communication device 200. In another embodiment, a shielding cover (shielding mask) for shielding electromagnetic interference or a middle frame for supporting the display unit 201 may be disposed on a side of the display unit 201 facing the back plate 112. The shielding cover or the middle frame is made of metal materials. The shield or bezel may be coupled to the backplane 112 to serve as a ground for the antenna structure 100 and the wireless communication device 200. At each of the above-mentioned points of grounding, the shielding case or the middle frame may replace the back plate 112 for grounding the antenna structure 100 or the wireless communication device 200. In another embodiment, the main circuit board of the wireless communication device 200 may be provided with a ground plane, which is grounded at each of the above places, and the ground plane may replace the back plate 112 for grounding the antenna structure 100 or the wireless communication device 200. The ground plane may be connected to the shield, center frame or the backplane 112.

Fig. 7 is a graph of S-parameters (scattering parameters) of the first antenna ANT1 when the first matching element 171 is an inductor and set to different inductance values. Wherein a curve S71 is the S11 value of the first antenna ANT1 when the first matching element 171 is an inductor with an inductance value of 2.1 nH. The curve S72 is the S11 value of the first antenna ANT1 when the first matching element 171 is an inductor with an inductance value of 1.5 nH. The curve S73 is the S11 value of the first antenna ANT1 when the first matching element 171 is an inductor with an inductance value of 2.7 nH.

Fig. 8 is a graph of S-parameters (scattering parameters) of the first antenna ANT1 when the second matching element 172 is a capacitor and set to different capacitance values. The curve S81 is the S11 value of the first antenna ANT1 when the second matching element 172 is a capacitor with a capacitance of 30 pF. Curve S82 is the S11 value of the first antenna ANT1 when the second matching element 172 is a capacitor with a capacitance of 10 pF. Curve S83 is the S11 value of the first antenna ANT1 when the second matching element 172 is a capacitor with a capacitance of 50 pF.

Fig. 9 is a graph of S-parameters (scattering parameters) of the first antenna ANT1 when the third matching element 173 is an inductor and set to different inductance values. Wherein, the curve S91 is the S11 value of the first antenna ANT1 when the third matching element 173 is an inductor with an inductance value of 8.2 nH. The curve S92 is the S11 value of the first antenna ANT1 when the third matching element 173 is an inductor with an inductance value of 6.2 nH. The curve S93 is the S11 value of the first antenna ANT1 when the third matching element 173 is an inductor with an inductance value of 10.2 nH.

Fig. 10 is a graph of S-parameters (scattering parameters) of the first antenna ANT1 when the fourth matching element 174 is an inductor and set to different inductance values. Wherein the curve S101 is the S11 value of the first antenna ANT1 when the fourth matching element 174 is an inductor with an inductance value of 3.6 nH. Curve S102 is the S11 value of the first antenna ANT1 when the fourth matching element 174 is an inductor with an inductance value of 3.3 nH. Curve S103 is the S11 value of the first antenna ANT1 when the fourth matching element 174 is an inductor with an inductance value of 3.9 nH.

It is obvious from fig. 7 to fig. 10 that the second matching element 172 and the third matching element 173 in the antenna structure 100 are mainly used for adjusting the middle frequency band of the first mode, i.e. 1710-. The first matching element 171 is used for adjusting the first high frequency band of the first mode, i.e. the 2300 and 2400MHz frequency bands. The fourth matching element 174 is used for adjusting the second high frequency band of the first mode, i.e. 2500-.

Fig. 11 is a graph of S parameters (scattering parameters) of the first antenna ANT1 when the first matching element 171, the second matching element 172, the third matching element 173, and the fourth matching element 174 in the matching circuit 17 are respectively an inductor with an inductance value of 2.1nH, a capacitor with a capacitance value of 30pF, an inductor with an inductance value of 8.2nH, and an inductor with an inductance value of 3.6 nH.

Fig. 12 is a graph of radiation efficiency of the first antenna ANT1 when the first matching element 171, the second matching element 172, the third matching element 173, and the fourth matching element 174 in the matching circuit 17 are respectively an inductor with an inductance value of 2.1nH, a capacitor with a capacitance value of 30pF, an inductor with an inductance value of 8.2nH, and an inductor with an inductance value of 3.6 nH. Wherein the curve S121 is the radiation efficiency of the first antenna ANT 1. Curve S122 is the total radiation efficiency of the first antenna ANT 1. Obviously, the medium-high frequency of the first antenna ANT1 can cover 1710-2690MHz, and the antenna efficiency is greater than-3 dB in the effective frequency band, so as to meet the design requirement of the antenna.

Fig. 13 is a graph of S-parameters (scattering parameters) of the second antenna ANT2 when the first switching element 181 is set to have an inductance with different inductance values and the second switching element 183 is an inductance with an inductance value of 5 nH. The curve S131 is the S11 value of the second antenna ANT2 when the first switching element 181 is short-circuited and the second switching element 183 is an inductor with an inductance value of 5 nH. The curve S132 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are both inductors with inductance value of 5 nH. A curve S133 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductors with inductance values of 10nH and 5nH, respectively. A curve S134 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductors with inductance values of 20nH and 5nH, respectively. A curve S135 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductors with inductance values of 30nH and 5nH, respectively.

Fig. 14 is a graph of S-parameters (scattering parameters) of the second antenna ANT2 when the first switching element 181 is set to have an inductance with different inductance values and the second switching element 183 is an inductance with an inductance value of 10 nH. The curve S141 is the S11 value of the second antenna ANT2 when the first switching element 181 is short-circuited and the second switching element 183 is an inductor with an inductance value of 10 nH. The curve S142 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductors with inductance values of 5nH and 10nH, respectively. The curve S143 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are both inductors with inductance value of 10 nH. A curve S144 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductors with inductance values of 20nH and 10nH, respectively. The curve S145 is the S11 value of the second antenna ANT2 when the first and second switching elements 181 and 183 are inductors with inductance values of 30nH and 10nH, respectively.

Fig. 15 is a graph of S-parameters (scattering parameters) of the second antenna ANT2 when the first switching element 181 is set to have inductors with different inductance values and the second switching element 183 is an inductor with an inductance value of 15 nH. The curve S151 is the S11 value of the second antenna ANT2 when the first switching element 181 is short-circuited and the second switching element 183 is an inductor with an inductance value of 15 nH. The curve S152 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductors with inductance values of 5nH and 15nH, respectively. A curve S153 shows the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductors with inductance values of 10nH and 15nH, respectively. The curve S154 is the S11 value of the second antenna ANT2 when the first switching element 181 and the second switching element 183 are inductances of 20nH and 15nH, respectively. A curve S155 is the S11 value of the second antenna ANT2 when the first and second switching elements 181 and 183 are inductors with inductance values of 30nH and 15nH, respectively.

As can be seen from fig. 13 to 15, the second antenna ANT2 of the antenna structure 100 mainly adjusts the frequency band (700/850/900MHz) of the second antenna ANT2 through the second switching element 183, and then the first switching element 181 fine-tunes the frequency point of the second antenna ANT2 to match the impedance.

Referring to table 1, the working frequency band of the second antenna ANT2 in the antenna structure 100 is shown when the switching circuit 18 is configured differently.

Fig. 16 is a graph of the S parameter (scattering parameter) of the second antenna ANT2 in the antenna structure 100. The curve S161 is the S11 value of the second antenna ANT2 operating at 704-746MHz (LTE-a band 17). The curve S162 is the S11 value of the second antenna ANT2 when operating at 746-787MHz (LTE-a band 13). The curve S163 is the S11 value of the second antenna ANT2 operating at 824-894MHz (LTE-a band 5). The curve S164 is the S11 value of the second antenna ANT2 when operating at 880-960MHz (LTE-a band 8).

Fig. 17 is a graph of radiation efficiency of the second antenna ANT2 in the antenna structure 100. The curve S171 is the radiation efficiency of the second antenna ANT2 when operating at 704-746MHz (LTE-a band 17). The curve S172 is the radiation efficiency of the second antenna ANT2 operating at 746-787MHz (LTE-a band 13). The curve S173 is the radiation efficiency of the second antenna ANT2 when operating at 824-894MHz (LTE-a band 5). The curve S174 shows the radiation efficiency of the second antenna ANT2 when operating at 880-960MHz (LTE-a band 8).

Fig. 18 is a graph of the total radiation efficiency of the second antenna ANT2 in the antenna structure 100. The curve S181 represents the total radiation efficiency of the second antenna ANT2 when operating at 704-746MHz (LTE-a band 17). The curve S182 is the total radiation efficiency of the second antenna ANT2 operating at 746-. The curve S183 is the total radiation efficiency of the second antenna ANT2 when operating at 824-894MHz (LTE-a band 5). The curve S184 shows the total radiation efficiency of the second antenna ANT2 when operating at 880-960MHz (LTE-a band 8).

Obviously, as can be seen from fig. 16 to 18, the low frequency covering type 700-960MHz of the antenna structure 100 has radiation efficiency greater than-5 dB, meets the antenna design requirement, and has better radiation efficiency.

It is understood that, in other embodiments, the antenna structure 100 is not limited to the first disconnection point 123 and the second disconnection point 124, that is, the number of the disconnection points is not limited to two, and may be only one or more, only that the antenna structure 100 can form at least the first antenna segment a1 and the second antenna segment a2 which are spaced apart from each other is ensured.

As described above, the antenna structure 100 is provided with the slot 120, the first slot 121, the second slot 122, the first break point 123 and the second break point 124, so as to define the first antenna segment a1 and the second antenna segment a2 arranged at intervals from the front frame 111. The antenna structure 100 is further provided with a coupling portion 14, a parasitic portion 15 and a radiating portion 16, so that the coupling portion 14, the parasitic portion 15 and the first antenna segment a1 form a first antenna ANT1 to generate a radiation signal in a middle-high frequency band. The radiating portion 16 and the second antenna segment a2 form a second antenna ANT2, so as to generate a radiation signal of a low frequency band. The wireless communication apparatus 200 may receive or transmit wireless signals in a plurality of different frequency bands simultaneously with the first and second antennas ANT1 and ANT2 using a Carrier Aggregation (CA) technique of long term evolution-Advanced (LTE-Advanced) to increase a transmission bandwidth.

In addition, the antenna structure 100 is provided with the housing 11, and the first opening 118, the second opening 119, the slot 120, the first gap 121, the second gap 122, the first break point 123 and the second break point 124 on the housing 11 are all disposed on the front frame 111 and the frame 113, and are not disposed on the back plate 112, so that the back plate 112 constitutes an all-metal structure, that is, there is no insulating slot, break line or break point on the back plate 112, so that the back plate 112 can avoid the integrity and the aesthetics of the back plate 112 being affected by the arrangement of the slot, break line or break point.

Referring to fig. 19 to fig. 21, an antenna structure 100a according to a second preferred embodiment of the present invention is shown. The antenna structure 100a includes a housing 11, a first ground portion 12, a second ground portion 13, a coupling portion 14, a radiation portion 16, a first feed source S1, a second feed source S2, a switching circuit 18, a matching circuit 27, and a filter circuit 29. The housing 11 includes a front frame 111, a back plate 112 and a frame 113. The frame 113 at least includes a terminal portion 115, a first side portion 116 and a second side portion 117. The frame 113 is further provided with a first opening 118, a second opening 119 and a slot 120. The front frame 111 is provided with a first gap 121, a second gap 122, a first break point 123 and a second break point 124. The slot 120, the first slot 121, the second slot 122, the first break point 123 and the second break point 124 together separate a first antenna segment a1 and a second antenna segment a2 from the housing 11.

It can be understood that, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the distance between the first break point 123 and the second break point 124 is relatively large. Specifically, in the present embodiment, the distance between the first break point 123 and the second break point 124 is 23.1 mm.

It can be understood that, referring to fig. 19 and fig. 20 together, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the antenna structure 100a does not include the parasitic portion 15, i.e., the parasitic portion 15 is omitted. In this way, the first antenna ANT1 forms a three-port network structure, i.e., the matching circuit 27 does not include the fourth matching element 174. Specifically, in the present embodiment, the matching circuit 27 includes a first matching element 271, a second matching element 272, and a third matching element 273. In the present embodiment, the first matching element 271, the second matching element 272 and the third matching element 273 are all inductors, and the inductance values thereof are 2.7nH, 13nH and 0.8nH, respectively.

In addition, referring to fig. 21, in the present embodiment, the antenna structure 100a is different from the antenna structure 100 in that the specific circuit structures of the filter circuit 29 and the filter circuit 19 are different. Specifically, the filter circuit 29 includes a first inductor L2, a second inductor L3, and a capacitor C3. The first inductor L2 and the second inductor L3 are connected in series between the first switching element 181 and the second feeding source S2. One end of the capacitor C3 is electrically connected between the first inductor L2 and the second inductor L3, and the other end is electrically connected to the back plate 112, i.e., grounded, so as to form a T-shaped filter structure with the first inductor L2 and the second inductor L3. In one embodiment, the inductance values of the first inductor L2 and the second inductor L3 are 9.1 nH. The capacitance value of the capacitor C3 is 3.3 pF.

Referring to table 2, the working frequency band of the second antenna ANT2 in the antenna structure 100a is shown when the switching circuit 18 in the antenna structure 100a adopts different configurations.

Fig. 22 is a graph of an S parameter (scattering parameter) of the first antenna ANT1 in the antenna structure 100 a. Fig. 23 is a radiation efficiency graph of the first antenna ANT1 in the antenna structure 100 a. Where the curve S231 is the radiation efficiency of the first antenna ANT1 in the antenna structure 100 a. Curve S232 is the total radiation efficiency of the first antenna ANT1 in the antenna structure 100 a. It is obvious from fig. 22 to 23 that, although the antenna structure 100a does not include the parasitic portion 15, the medium-high frequency of the antenna structure 100a can also cover 1710-2690MHz, and the radiation efficiency and the total radiation efficiency are both greater than-3 dB, so as to satisfy the antenna design requirement and have better radiation efficiency.

Fig. 24 is a graph of the S parameter (scattering parameter) of the second antenna ANT2 in the antenna structure 100 a. The curve S241 is the S11 value of the second antenna ANT2 operating at 704-746MHz (LTE-a band 17). The curve S242 is the S11 value of the second antenna ANT2 when operating at 746-787MHz (LTE-a band 13). The curve S243 is the S11 value of the second antenna ANT2 operating at 824-894MHz (LTE-a band 5). The curve S244 is the S11 value of the second antenna ANT2 when operating at 880-960MHz (LTE-a band 8).

Fig. 25 is a graph of radiation efficiency of the second antenna ANT2 in the antenna structure 100 a. The curve S251 is the radiation efficiency of the second antenna ANT2 when operating at 704-746MHz (LTE-a band 17). The curve S252 shows the radiation efficiency of the second antenna ANT2 operating at 746-787MHz (LTE-a band 13). The curve S253 is the radiation efficiency of the second antenna ANT2 when operating at 824-894MHz (LTE-a band 5). The curve S254 shows the radiation efficiency of the second antenna ANT2 when operating at 880-960MHz (LTE-a band 8).

Fig. 26 is a graph of the total radiation efficiency of the second antenna ANT2 in the antenna structure 100 a. The curve S261 is the total radiation efficiency of the second antenna ANT2 when operating at 704-746MHz (LTE-a band 17). The curve S262 is the total radiation efficiency of the second antenna ANT2 operating at 746-. The curve S263 shows the total radiation efficiency of the second antenna ANT2 when operating at 824-894MHz (LTE-a band 5). The curve S264 is the total radiation efficiency of the second antenna ANT2 when operating at 880-960MHz (LTE-a band 8). It is obvious from fig. 24 to fig. 26 that, although the antenna structure 100a does not include the parasitic portion 15, the low frequency of the antenna structure 100a can also cover 700 and 960MHz, and both the radiation efficiency and the total radiation efficiency are greater than-5 dB, which satisfies the antenna design requirement and has better radiation efficiency.

Example 3

Referring to fig. 27, a third preferred embodiment of the present invention provides an antenna structure 300, which can be applied to a wireless communication device 400 such as a mobile phone, a personal digital assistant, etc., for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to fig. 28, the antenna structure 300 includes a housing 31, a first radiation portion 33, a second radiation portion 34, a third radiation portion 35, and a signal feeding source 36. The housing 31 may be an outer shell of the wireless communication device 300. In the present embodiment, the housing 31 is made of a metal material. The housing 31 includes a front frame 311, a back plate 312, and a frame 313. The front frame 311, the back plate 312 and the frame 313 may be integrally formed. The front frame 311, the back plate 312, and the bezel 313 constitute a housing of the wireless communication device 400. The front frame 311 is provided with an opening (not shown) for accommodating the display unit 401 of the wireless communication device 400. It is understood that the display unit 401 has a display plane exposed in the opening and disposed substantially parallel to the back plate 312.

The back plate 312 is disposed opposite to the front frame 311. The back plate 312 is directly connected with the frame 313, and no gap exists between the back plate 312 and the frame 313. The back plate 312 corresponds to the ground of the antenna structure 300 and the wireless communication device 400.

The frame 313 is sandwiched between the front frame 311 and the back plate 312, and is respectively disposed around the peripheries of the front frame 311 and the back plate 312, so as to enclose an accommodating space 314 together with the display unit 401, the front frame 311, and the back plate 312. The accommodating space 314 is used for accommodating electronic components or circuit modules of the wireless communication device 400, such as a circuit board, a processing unit, and the like.

The frame 313 includes at least a terminal portion 315, a first side portion 316, and a second side portion 317. In this embodiment, the terminal portion 315 is a top end of the wireless communication device 400. The terminal portion 315 connects the front frame 311 and the back plate 312. The first side portion 316 is disposed opposite to the second side portion 317, and the first side portion 316 and the second side portion 317 are disposed at two ends of the end portion 315, preferably vertically. The first side portion 316 and the second side portion 317 also connect the front frame 311 and the back plate 312.

The frame 313 is further provided with a slot 320. The front frame 311 is provided with a first slit 321, a second slit 322, a first break 323 and a second break 324. In the present embodiment, the slots 320 are disposed on the end portion 315 and extend to the first side portion 316 and the second side portion 317 respectively. It is understood that, in other embodiments, the slot 320 may be disposed on the end portion 315 only and not extend to any one of the first side portion 316 and the second side portion 317, or the slot 320 may be disposed on the end portion 315 and only extend to one of the first side portion 316 and the second side portion 317.

The first slit 321, the second slit 322, the first break 323 and the second break 324 are all communicated with the slot 320 and extend to block the front frame 311. In this embodiment, the first slit 321 is opened on the front frame 311, and is communicated with the first end D1 of the slot 320 disposed on the first side portion 316. The second gap 322 is opened on the front frame 311, and is communicated with the second end D2 of the slot 320 arranged on the second side 317. The first breaking point 323 and the second breaking point 324 are disposed on the front frame 311 between the first end D1 and the second end D2 at intervals, and are in communication with the slot 320. As such, the slot 320, the first slot 321, the second slot 322, the first break 323, and the second break 324 together separate at least the corresponding antenna segment E1 from the housing 31. Wherein the front frame 311 between the first gap 321 and the first break point 323 constitutes the antenna segment E1. It can be understood that, in the present embodiment, the slots 320, the first gap 321, the second gap 322, the first break 323, and the second break 324 are all filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but not limited thereto).

It can be understood that, in the present embodiment, the slot 320 is opened at one end of the side frame 313 close to the back plate 312 and extends to the front frame 311, so that the antenna segment E1 is completely formed by a part of the front frame 311. Of course, in other embodiments, the opening position of the slot 320 may also be adjusted according to specific requirements. For example, the slot 320 is opened at one end of the side frame 313 close to the back plate 312, and extends toward the front frame 311, so that the antenna segment E1 is formed by a part of the front frame 311 and a part of the side frame 313.

It can be understood that there are no other insulation slots, breaks or breakpoints on the upper half portions of the front frame 311 and the side frame 313 except for the slot 320, the first slot 321, the second slot 322, the first breakpoint 323 and the second breakpoint 324, so that the upper half portion of the front frame 311 only has the first slot 321, the second slot 322, the first breakpoint 323 and the second breakpoint 324, and there are no other breakpoints.

It will be appreciated that in this embodiment, the width of the slot 320 is approximately 3.43 mm. The widths of the first and second break points 323, 324 are approximately 2 mm. The width of the first slit 321 and the second slit 322 is approximately 3.43 mm. The distance between the first 323 and second 324 break points is approximately 11.1 mm.

Referring to fig. 29, the wireless communication device 400 further includes at least one electronic component. In this embodiment, the wireless communication device 400 includes a first electronic component 402, a second electronic component 403, a third electronic component 404, a fourth electronic component 405, and a fifth electronic component 406. The first electronic component 402 is a front camera module, and is disposed between the first break point 323 and the first side portion 316. The second electronic component 403 is a speaker module disposed between the first break point 323 and the second break point 324. The third electronic component 404 and the fourth electronic component 405 are rear camera modules, and are disposed between the second electronic component 403 and the second side portion 317 at intervals. The fifth electronic component 406 is a flash lamp.

The back plate 312 is a single metal sheet formed integrally, and in order to expose the dual-camera lens (i.e., the third electronic component 404 and the fourth electronic component 405) and the flash lamp (i.e., the fifth electronic component 406), the back plate 312 is provided with through holes 407, 408, and 409. The back plate 312 does not have any slots, breaks, or breaks therein for separating the insulation of the back plate 312.

In the present embodiment, the first radiation portion 33, the second radiation portion 34 and the third radiation portion 35 are spaced apart from each other. The first radiation portion 33 includes a first connection section J1, a first radiation section 331, a second radiation section 332, a third radiation section 333, a fourth radiation section 334, and a fifth radiation section 335. The first connecting section J1 is substantially in the shape of a rectangular bar, and is disposed in a plane perpendicular to the back plate 312 and between the first electronic component 402 and the second electronic component 403. One end of the first connecting section J1 is electrically connected to the signal feeding source 36 for feeding current to the first radiation part 33. The first radiating section 331 is disposed in a plane parallel to the back plate 312. The first radiating section 331 is substantially triangular, and a vertex thereof is perpendicularly connected to an end of the first connecting section J1 away from the signal feeding source 36. The second, third, fourth and fifth radiating segments 332, 333, 334 and 335 are disposed coplanar with the first radiating segment 331. The second radiation section 332 and the third radiation section 333 are both rectangular strips, and both are electrically connected to the other two vertices of the first radiation section 331, and extend along the direction parallel to the end portion 315 and toward the first side portion 316 and the second side portion 317, so as to form a substantially T-shaped structure with the first radiation section 331. The fourth radiation section 334 is substantially in the shape of a rectangular bar, and one end of the fourth radiation section 334 is perpendicularly connected to one end of the third radiation section 333 away from the first radiation section 331 and extends in a direction parallel to the first side portion 316 and close to the end portion 315. The fifth radiation segment 335 has a substantially rectangular strip shape, and one end thereof is perpendicularly connected to one end of the fourth radiation segment 334 away from the third radiation segment 333 and extends in a direction parallel to the end portion 315 and close to the first side portion 316.

The second radiation portion 34 is disposed between the first radiation portion 33 and the third radiation portion 35, and includes a second connection section J2, a first radiation arm 341, a second radiation arm 342, a third radiation arm 343, a fourth radiation arm 344, and a fifth radiation arm 345, which are connected in sequence. The second connecting section J2 is substantially a straight strip and is disposed in a plane perpendicular to the back plate 312. One end of the second connection section J2 is electrically connected to the back plate 312, i.e., grounded. The first radiating arm 341 is substantially rectangular and disposed in a plane parallel to the back plate 312. The first radiating arm 341 has one end perpendicularly connected to the end of the second connecting section J2 away from the back plate 312, and extends in a direction parallel to the first side portion 316 and close to the terminal portion 315. The second, third, fourth and fifth radiating arms 342, 343, 344 and 345 are disposed coplanar with the first radiating arm 341. The second radiating arm 342 is substantially rectangular and has one end perpendicularly connected to one end of the first radiating arm 341 away from the second connecting section J2, and extends in a direction parallel to the terminal portion 315 and close to the second side portion 317. The third radiating arm 343 is substantially rectangular and has one end perpendicularly connected to one end of the second radiating arm 342 away from the first radiating arm 341, and continues to extend in a direction parallel to the first radiating arm 341 and close to the terminal portion 315. The fourth radiating arm 344 is substantially rectangular and has one end perpendicularly connected to an end of the third radiating arm 343 away from the second radiating arm 342, and continues to extend in a direction parallel to the second radiating arm 342 and close to the second side portion 317. The fifth radiating arm 345 is substantially rectangular and has one end perpendicularly connected to the end of the fourth radiating arm 344 away from the third radiating arm 343, and continues to extend in a direction parallel to the third radiating arm 343 and close to the end portion 315 until being electrically connected to the portion of the antenna segment E1 close to the first break point 323.

Referring to fig. 27 and 30 again, the third radiation portion 35 is disposed between the second radiation portion 34 and the first side portion 316. The third radiation part 35 includes a third connection section J3, a first resonance section 351, a second resonance section 352, a third resonance section 353, a fourth resonance section 354 and a fifth resonance section 355. The third connecting section J3 is substantially a straight strip and is disposed in a plane perpendicular to the back plate 312. The third connecting segment J3 is disposed between the second connecting segment J2 and the first side 316. One end of the third connection segment J3 is electrically connected to the back plate 312, i.e., grounded. The first resonant section 351 is substantially rectangular and disposed in a plane parallel to the backplate 312. The first resonance section 351 is electrically connected to an end of the third connecting section J3 away from the back plate 312 at one end, and extends in a direction parallel to the first side portion 316 and close to the end portion 315. The second, third, fourth and fifth resonance sections 352, 353, 354 and 355 are disposed coplanar with the first resonance section 351. The second resonance section 352 has a substantially rectangular bar shape, and one end of the second resonance section 352 is perpendicularly connected to the end of the first resonance section 351 away from the third connection section J3 and extends in a direction parallel to the end portion 315 and close to the second side portion 317. The third resonant section 353 has a substantially triangular shape, is connected to the connection between the first resonant section 351 and the second resonant section 352, and extends in a direction close to the first side portion 316. The fourth resonant section 354 is substantially rectangular in shape, and has one end perpendicularly connected to the end of the third resonant section 353 away from the second resonant section 352 and extending in a direction parallel to the first resonant section 351 and away from the end portion 315. The fifth resonant section 355 is substantially rectangular and has one end perpendicularly connected to the end of the fourth resonant section 354 far from the third resonant section 353, extends in a direction parallel to the end portion 315 and close to the second side portion 317, and passes over the second connection section J2 and the third connection section J3 and is spaced apart from the first electronic component 402.

It can be understood that, referring to fig. 31 and 33, in the present embodiment, the antenna segment E1, the first radiation portion 33, and the second radiation portion34 and the third radiation portion 35 together form an antenna ANT3 for exciting a resonance mode to generate a radiation signal of a predetermined frequency band. In this embodiment, the resonance mode is an LTE-a low, medium, and high frequency mode. The predetermined frequency ranges include 734-960MHz frequency range and 1805-2690MHz frequency range. Specifically, referring to fig. 31, when a current enters from the signal feeding source 36, the current flows through the first radiation portion 33 and is coupled to the second radiation portion 34 through the first radiation portion 33. A part of the current coupled to the second radiation part 34 will be directly grounded through the second connection J2 of the second radiation part 34. Another part of the current flows directly into the antenna segment E1 through the second radiating portion 34. The current flowing in the antenna segment E1 is coupled to the second radiation part 34 again to be grounded through the second connection segment J2 of the second radiation part 34, so that the second radiation part 34 excites the resonant frequency f in a quarter-wave manner₀The low frequency band of 920MHz, namely 734 and 960MHz band (please refer to path I1). At the same time, the f_oWill also excite f₁The high frequency band of 2620MHz, namely 2500 + 2690MHz band.

Referring to fig. 32, when a current enters from the signal feeding source 36, the current flows through the first radiation portion 33, is coupled to the second radiation portion 34 through the first radiation portion 33, then flows directly into the antenna segment E1 through the second radiation portion 34, is coupled to the third radiation portion 35 through the antenna segment E1, and is finally grounded through the third connection segment J3 of the third radiation portion 35 and the back plate 312, so that the third radiation portion 35 excites f in a quarter-wave manner₂1940MHz, i.e. 1805 and 2300MHz (please refer to path I2).

As can be seen from fig. 31 and 32, in the present embodiment, the second radiation portion 34 is used to extend the length of the antenna segment E1, and the third radiation portion 35 is used to increase the bandwidth characteristic of the antenna ANT3 through secondary coupling.

It is understood that referring to fig. 33, in the present embodiment, the antenna ANT3 forms a three-port network. The three ports include a first connection segment J1, a second connection segment J2 and a third connection segment J3, and corresponding matching elements are arranged at the ports to form corresponding matching circuits 37, so that the resonance frequency band of the antenna ANT3 is effectively adjusted and optimized. Specifically, in one embodiment, the matching circuit 37 includes a first matching element 371, a second matching element 372 and a third matching element 373. One end of the first matching element 371 is electrically connected between the first connecting section J1 and the signal feeding source 36, and the other end is electrically connected to the back plate 312, i.e. to ground. One end of the second matching element 372 is electrically connected to the second connection section J2, and the other end is electrically connected to the back plate 312, i.e. grounded. One end of the third matching element 373 is electrically connected to the third connecting section J3, and the other end is electrically connected to the back plate 312, i.e., grounded. In this embodiment, the first matching element 371 and the third matching element 373 are both inductors. The second matching element 372 is an adjustable inductor that can be switched between a plurality of predetermined inductance values. In this way, by providing the adjustable second matching element 372, the matching circuit 37 also constitutes a switching circuit, so as to effectively adjust the low-frequency mode and a part of the high-frequency mode of the antenna ANT 3. It is understood that in other embodiments, the first matching element 371, the second matching element 372 and the third matching element 373 are not limited to the above-mentioned inductance and/or adjustable inductance, but may be other matching elements, switching elements or combinations thereof. For example, one or more of the first matching element 371, the second matching element 372 and the third matching element 373 may be a switching element that switches between a plurality of preset impedance values.

Fig. 34 is a graph of S-parameters (scattering parameters) of the antenna structure 300 when the first matching element 371 is an inductor and set to different inductance values. The curve S341 is the value of S11 of the antenna structure 300 when the first matching element 371 is an inductor with an inductance value of 10 nH. Curve S342 is the value of S11 for the antenna structure 300 when the first matching element 371 is an inductor with an inductance value of 5 nH. Curve S343 is the value of S11 of the antenna structure 300 when the first matching element 371 is an inductor with an inductance value of 25 nH. Curve S344 is the S11 value for the antenna structure 300 when the first matching element 371 is open.

Fig. 35 is a graph of the S-parameter (scattering parameter) of the antenna structure 300 when the second matching element 372 is an inductor and set to different inductance values. Where curve S351 is the value of S11 for the antenna structure 300 when the second matching element 372 is 0 ohms. Curve S352 is the S11 value for the antenna structure 300 when the second matching element 372 is an inductor with an inductance value of 3 nH. Curve S353 is the S11 value for the antenna structure 300 when the second matching element 372 is an inductor with an inductance value of 5 nH. Curve S354 is the value of S11 for the antenna structure 300 when the second matching element 372 is an inductor with an inductance value of 15 nH. Curve S355 is the S11 value for the antenna structure 300 when the second matching element 372 is an inductor with an inductance value of 30 nH.

Fig. 36 is a graph of S-parameters (scattering parameters) of the antenna structure 300 when the third matching element 373 is an inductor and set to different inductance values. The curve S361 is the S11 value of the antenna structure 300 when the third matching element 373 is an inductor with an inductance value of 2.1 nH. Curve S362 is the S11 value of the antenna structure 300 when the third matching element 373 is an inductor with an inductance value of 1.5 nH. Curve S363 is the S11 value of the antenna structure 300 when the third matching element 373 is an inductor with an inductance value of 1.8 nH. Curve S364 is the S11 value for the antenna structure 300 when the third matching element 373 is an inductor with an inductance value of 2.4 nH. Curve S365 is the S11 value of the antenna structure 300 when the third matching element 373 is an inductor with an inductance value of 2.7 nH.

It is obvious from fig. 34 to fig. 36 that the third matching element 373 of the antenna structure 300 is mainly used for adjusting the first high frequency band of the resonant mode, i.e. 2300-2400MHz band. The first matching element 371 is mainly used for adjusting the second high frequency band of the resonance mode, i.e. 2500-. The second matching element 372 is mainly used for adjusting the frequency point of the low frequency mode and the second high frequency band of the resonance mode.

Referring to table 3, the working frequency band of the antenna structure 300 is shown when the first matching element 371 in the matching circuit 37 is an inductor with an inductance value of 10nH, the third matching element 373 is an inductor with an inductance value of 2.1nH, and the second matching element 372 is different inductors.

Fig. 37 is a graph of the S-parameter (scattering parameter) of the antenna structure 300 operating in the low frequency mode. The curve S371 is the S11 value when the antenna structure 300 operates in the 704-746MHz band and the 746-787MHz band (LTE-a band 17/13). Curve S372 is the S11 value of the antenna structure 300 operating at 824-894MHz (LTE-a band 5). The curve S373 shows the S11 value of the antenna structure 300 operating at 880-960MHz (LTE-a band 8).

Fig. 38 is a graph of S-parameters (scattering parameters) of the antenna structure 300 operating in the middle and high frequency modes. The curve S381 is the S11 value when the antenna structure 300 operates in the intermediate frequency mode (1805-1910 MHz). The curve S382 is the S11 value when the antenna structure 300 operates at 2300-2400MHz (LTE-a band 40). The curve S383 is the S11 value of the antenna structure 300 operating at 2500-.

Fig. 39 is a graph of the radiation efficiency of the antenna structure 300 operating in the low frequency mode. The curve S391 shows the radiation efficiency of the antenna structure 300 when operating in the 704-746MHz band and the 746-787MHz band (LTE-a band 17/13). Curve S392 is the radiation efficiency of the antenna structure 300 operating at 824-894MHz (LTE-a band 5). Curve S393 is the radiation efficiency of the antenna structure 300 when operating at 880-960MHz (LTE-a band 8).

Fig. 40 is a graph of the total radiation efficiency of the antenna structure 300 operating in the low frequency mode. The curve S401 is the total radiation efficiency of the antenna structure 300 operating in the 704-746MHz band and the 746-787MHz band (LTE-a band 17/13). Curve S402 is the total radiation efficiency of the antenna structure 300 operating at 824-894MHz (LTE-a band 5). Curve S403 is the total radiation efficiency of the antenna structure 300 when operating at 880-960MHz (LTE-a band 8).

Fig. 41 is a graph of the radiation efficiency of the antenna structure 300 operating in the middle and high frequency modes. The curve S411 is the radiation efficiency of the antenna structure 300 operating in the intermediate frequency mode (1805-2300 MHz). Curve S412 is the radiation efficiency of the antenna structure 300 when operating at 2300-2400MHz (LTE-a band 40). Curve S413 is the radiation efficiency of the antenna structure 300 operating at 2500-.

Fig. 42 is a graph of the total radiation efficiency of the antenna structure 300 operating in the middle and high frequency modes. The curve S421 is the total radiation efficiency of the antenna structure 300 operating in the intermediate frequency mode (1805-2300 MHz). Curve S422 is the total radiation efficiency of the antenna structure 300 when operating at 2300-2400MHz (LTE-a band 40). Curve S423 shows the total radiation efficiency of the antenna structure 300 operating at 2500-.

It is clear from fig. 37 to 42 that although the low frequency of the antenna structure 300 can cover 734-960MHz, the total radiation efficiency is greater than-7 dB. The medium and high frequencies of the antenna structure 300 can cover 1805-2690MHz, and the total radiation efficiency is greater than-5 dB, so as to satisfy the antenna design requirement and have better radiation efficiency.

It is understood that, referring to fig. 43a to 43h, in other embodiments, the first radiation portion 33, the second radiation portion 34 and the third radiation portion 35 are not limited to the above configuration, and other configurations may be adopted, only three radiation portions are required to be disposed at intervals, one of the radiation portions is electrically connected to the antenna segment E1, and the other two radiation portions are disposed at intervals from the antenna segment E1. In addition, one of the three radiating portions is electrically connected to the signal feeding source 36, and the other two radiating portions are grounded. For example, referring to fig. 43a, in one embodiment, the first radiation portion 33, the second radiation portion 34 and the third radiation portion 35 are disposed at an interval. The first radiation portion 33 is electrically connected to the signal feeding source 36 and is spaced apart from the antenna segment E1. The second radiation portion 34 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded. The third radiation portion 35 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded.

Referring to fig. 43b, in one embodiment, the first radiation portion 33 is electrically connected to the antenna segment E1 and the signal feeding source 36, respectively. The second radiation portion 34 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded. The third radiation portion 35 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded.

Referring to fig. 43c, in one embodiment, the first radiating portion 33 is electrically connected to the antenna segment E1, and the other end is electrically connected to the back plate 312, i.e. grounded. The second radiation portion 34 is spaced from the antenna segment E1 and is electrically connected to the signal feeding source 36. The third radiation portion 35 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded.

Referring to fig. 43d, in one embodiment, the first radiating portion 33 is spaced apart from the antenna segment E1 and is electrically connected to the back plate 312, i.e. grounded. The second radiation portion 34 is spaced from the antenna segment E1 and is electrically connected to the signal feeding source 36. The third radiation portion 35 is electrically connected to the antenna segment E1 and to the back plate 312, i.e., to ground.

Referring to fig. 43E, in one embodiment, the first radiating portion 33 is spaced apart from the antenna segment E1 and is electrically connected to the back plate 312, i.e. grounded. The second radiation portion 34 is electrically connected to the antenna segment E1 and to the signal feeding source 36. The third radiation portion 35 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded.

Referring to fig. 43f, in one embodiment, the first radiating portion 33 is spaced apart from the antenna segment E1 and is electrically connected to the back plate 312, i.e. grounded. The second radiation portion 34 is electrically connected to the antenna segment E1 and to the back plate 312, i.e., to ground. The third radiation portion 35 is spaced from the antenna segment E1 and is electrically connected to the signal feeding source 36.

Referring to fig. 43g, in one embodiment, the first radiating portion 33 is electrically connected to the antenna segment E1, and the other end is electrically connected to the back plate 312, i.e. grounded. The second radiation portion 34 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded. The third radiation portion 35 is spaced from the antenna segment E1 and is electrically connected to the signal feeding source 36.

Referring to fig. 43h, in one embodiment, the first radiating portion 33 is spaced apart from the antenna segment E1 and is electrically connected to the back plate 312, i.e. grounded. The second radiation portion 34 is spaced apart from the antenna segment E1, and is electrically connected to the back plate 312, i.e., grounded. The third radiation portion 35 is electrically connected to the antenna segment E1 and is electrically connected to the signal feeding source 36.

It is understood that in the above embodiments, the back plate 312 can serve as a ground for the antenna structure 300 and the wireless communication device 400. In another embodiment, a shielding cover (shielding mask) for shielding electromagnetic interference or a middle frame for supporting the display unit 401 may be disposed on a side of the display unit 401 facing the back plate 312. The shielding cover or the middle frame is made of metal materials. The shield or bezel may be coupled to the backplane 312 to serve as a ground for the antenna structure 300 and the wireless communication device 400. At each of the above-mentioned points of grounding, the shielding case or the middle frame may replace the back plate 312 for grounding the antenna structure 300 or the wireless communication device 400. In another embodiment, the main circuit board of the wireless communication device 400 may be provided with a ground plane, which is grounded at each of the above places, and the ground plane may replace the back plate 312 for grounding the antenna structure 300 or the wireless communication device 400. The ground plane may be connected to the shield, center frame or the backplane 312.

As described above, the antenna structure 300 at least defines the antenna segment E1 from the front frame 311 by providing the slot 320, the first slot 321, the second slot 322, the first break 323 and the second break 324. The antenna structure 300 is further provided with a first radiation portion 33, a second radiation portion 34, a third radiation portion 35 and a signal feed source 36, so that the first radiation portion 33, the second radiation portion 34, the third radiation portion 35 and the antenna segment E1 form an antenna ANT3, so as to generate radiation signals of LTE-a in low, medium and high frequency bands. The wireless communication device 400 may receive or transmit wireless signals in a plurality of different frequency bands simultaneously with the antenna ANT3 using a Carrier Aggregation (CA) technique of LTE-Advanced (LTE-Advanced) to increase a transmission bandwidth.

In addition, the antenna structure 300 is disposed on the housing 31, and the slot 320, the first slot 321, the second slot 322, the first breakpoint 323, and the second breakpoint 324 on the housing 31 are disposed on the front frame 311 and the side frame 313, and are not disposed on the back plate 312, so that the back plate 312 forms an all-metal structure, that is, there is no insulated slot, disconnection, or breakpoint on the back plate 312, and the back plate 312 can avoid the integrity and the aesthetics of the back plate 312 being affected by the disposition of the slot, disconnection, or breakpoint.

Example 4

Referring to fig. 44, a fourth preferred embodiment of the present invention provides an antenna structure 500, which can be applied to a wireless communication device 600 such as a mobile phone, a personal digital assistant, etc. for transmitting and receiving radio waves to transmit and exchange wireless signals.

Referring to fig. 45, the antenna structure 500 includes a housing 51, a first resonant portion 53, a second resonant portion 54, an extending portion 55, and a signal feeding source 56. The housing 51 may be a casing of the wireless communication device 600. In the present embodiment, the housing 51 is made of a metal material. The housing 51 includes a front frame 511, a back plate 512, and a bezel 513. The front frame 511, the back plate 512 and the frame 513 may be integrally formed. The front bezel 511, back panel 512, and bezel 513 constitute the housing of the wireless communication device 600. The front frame 511 is provided with an opening (not shown) for accommodating the display unit 601 of the wireless communication device 600. It is understood that the display unit 601 has a display plane exposed in the opening and disposed substantially parallel to the back plate 512.

The back plate 512 is disposed opposite to the front frame 511. The back plate 512 is directly connected to the frame 513, and there is no gap between the back plate 512 and the frame 513. The back plate 512 is equivalent to the ground of the antenna structure 500 and the wireless communication device 600.

The frame 513 is sandwiched between the front frame 511 and the back plate 512, and is respectively disposed around the peripheries of the front frame 511 and the back plate 512, so as to form an accommodating space 514 together with the display unit 601, the front frame 511 and the back plate 512. The accommodating space 514 is used for accommodating electronic components or circuit modules of the wireless communication device 600, such as a circuit board, a processing unit, and the like.

The frame 513 at least includes a terminal portion 515, a first side portion 516, and a second side portion 517. In this embodiment, the end portion 515 is a top end of the wireless communication device 600. The end portion 515 connects the front frame 511 and the rear plate 512. The first side portion 516 and the second side portion 517 are disposed opposite to each other, and are disposed at two ends of the end portion 515, preferably, vertically. The first side portion 516 and the second side portion 517 are also connected to the front frame 511 and the back plate 512.

The frame 513 is further provided with a slot 520. The front frame 511 is provided with a first gap 521, a second gap 522, a first break point 523 and a second break point 524. In this embodiment, the slots 520 are disposed on the end portion 515 and extend to the first side portion 516 and the second side portion 517, respectively. It is understood that, in other embodiments, the slot 520 may be disposed only on the end portion 515 and not extend to any one of the first side portion 516 and the second side portion 517, or the slot 520 may be disposed on the end portion 515 and only extend to one of the first side portion 516 and the second side portion 517.

The first slit 521, the second slit 522, the first break 523 and the second break 524 are all communicated with the slot 520 and extend to block the front frame 511. In this embodiment, the first slit 521 is opened on the front frame 511 and is communicated with the first end H1 of the slot 520 disposed on the first side portion 516. The second slot 522 is opened on the front frame 511 and is communicated with the second end H2 of the slot 520 arranged on the second side 517. The first break point 523 and the second break point 524 are disposed on the front frame 511 between the first end H1 and the second end H2 at an interval, and are communicated with the slot 520. In this way, the slot 520, the first slot 521, the second slot 522, the first break 523 and the second break 524 together separate the corresponding antenna segment K1 from the housing 51. Wherein the front frame 511 between the first gap 521 and the first break 523 forms the antenna segment K1. It can be understood that, in the present embodiment, the slots 520, the first slot 521, the second slot 522, the first break point 523 and the second break point 524 are all filled with an insulating material (for example, plastic, rubber, glass, wood, ceramic, etc., but this is not the case).

It is understood that, in the present embodiment, the slot 520 is opened at one end of the frame 513 close to the back plate 512 and extends to the front frame 511, so that the antenna segment K1 is completely formed by a part of the front frame 511. Of course, in other embodiments, the opening position of the slot 520 may also be adjusted according to specific requirements. For example, the slot 520 is opened at one end of the frame 513 close to the back plate 512 and extends toward the front frame 511, so that the antenna segment K1 is formed by a part of the front frame 511 and a part of the frame 513.

It can be understood that, the upper half portions of the front frame 511 and the side frame 513 are not provided with other insulating slots, breaks or breakpoints except for the slot 520, the first slot 521, the second slot 522, the first breakpoint 523 and the second breakpoint 524, so that the upper half portion of the front frame 511 only has the first slot 521, the second slot 522, the first breakpoint 523 and the second breakpoint 524, and has no other breakpoints.

It will be appreciated that in this embodiment, the width of the slot 520 is approximately 3.43 mm. The widths of the first break 523 and the second break 524 are approximately 2 mm. The width of the first gap 521 and the second gap 522 is approximately 3.43 mm.

Referring to fig. 46, the wireless communication device 600 further includes at least one electronic component. In this embodiment, the wireless communication device 600 includes a first electronic component 602, a second electronic component 603, a third electronic component 604, a fourth electronic component 605, and a fifth electronic component 606. The first electronic component 602 is a front camera module, and is disposed between the second breaking point 524 and the second side 517. The second electronic component 603 is a speaker module disposed between the first break point 523 and the second break point 524. The third electronic component 604 and the fourth electronic component 605 are both rear camera modules, and are disposed between the second electronic component 603 and the first side portion 516 at intervals. The fifth electronic component 606 is a flash lamp.

The back plate 512 is a single metal sheet formed integrally, and in order to expose the dual camera lens (i.e. the third electronic element 604 and the fourth electronic element 605) and the flash lamp (i.e. the fifth electronic element 606), the back plate 512 is provided with through holes 607, 608, 609. The backplate 512 does not have any slots, breaks, or breaks provided thereon for separating the insulation of the backplate 512.

It can be understood that, referring to fig. 45 and fig. 47, in the present embodiment, the slot 520 is opened at the end portion 515 and extends to the first side portion 516 and the second side portion 517. The antenna segment K1 comprises a first segment K11 and a second segment K12 which are perpendicular to each other, and the first segment K11 and the second segment K12 form a bend angle at the connection position. The first resonant portion 53, the second resonant portion 54, the extension portion 55 and the signal feeding source 56 are all located in the accommodating space 525 beginning at the first section K11 and the second section K12 and ending at the first gap 521 and the first break 523.

In the present embodiment, the first resonance part 53, the second resonance part 54, and the extension part 55 are disposed at an interval from each other. The first resonance part 53 includes a first connection arm Q1, a first resonance section 531, and a second resonance section 532. The first connecting arm Q1 is substantially rectangular in shape, located in a plane perpendicular to the backplate 512, and electrically connected to the signal feeding source 56 for feeding current to the first resonant portion 53. The first resonant section 531 is substantially rectangular strip-shaped and is located in a plane parallel to the backplate 512. One end of the first resonant section 531 is perpendicularly connected to the end of the first connecting arm Q1 away from the signal feeding source 56, and extends in a direction parallel to the first side portion 516 and close to the end portion 515 until being electrically connected to the first section K11. The second resonance section 532 is disposed coplanar with the first resonance section 531. The second resonance section 532 is substantially triangular, and one end thereof is perpendicularly connected to a side of the first resonance section 531 away from the first side portion 516 and extends in a direction close to the second side portion 517.

The second resonance portion 54 includes a second connection arm Q2 and a resonance arm 541. The second connecting arm Q2 is disposed in a plane perpendicular to the back plate 512. The second connecting arm Q2 is substantially rectangular and electrically connected to the back plate 512, i.e. grounded. The resonant arm 541 is substantially straight and disposed in a plane parallel to the backplate 512. One end of the resonance arm 541 is electrically connected to one end of the second connection arm Q2 away from the back plate 512, and extends in a direction parallel to the end portion 515 and closer to the first side portion 516 until being perpendicularly connected to one side of the second segment K12 closer to the first slit 521.

In this embodiment, the extension 55 is an arc-shaped piece attached to the insulating material of the slot 520. Specifically, the extension 55 includes a first extension 551 and a second extension 552. The first extension 551 and the second extension 552 are perpendicular to each other, and form a corner at the junction of the two. The first extension 551 is attached to the insulation of the slot 520 at the end 515 and is electrically connected to the first segment K11. The second extension segment 552 is attached to the insulating material of the slot 520 at the first side portion 516, and the corners of the first extension segment 551 and the second extension segment 552 are attached to the corners of the first side portion 516 and the end portion 515 in the slot 520. In addition, in the present embodiment, the first extension 551 extends between the first resonance portion 53 and the back plate 512, and the second extension 552 extends between the second resonance portion 54 and the back plate 512.

It is understood that in other embodiments, the extension 55 may not be attached to the insulating material of the slot 520. Specifically, the extension 55 may be spaced apart from the slot 520, and the bend angle formed by the extension 55 is parallel to the bend angle of the antenna segment K1. Thus, the antenna segment K1 will lie in a first plane, the extension 55 will lie in a second plane, and the backplate 512 will lie in a third plane. The first plane, the second plane and the third plane are different from each other and are parallel to each other. The second plane is located between the first plane and a third plane.

Referring to fig. 48 and fig. 49 together, it can be understood that, in the present embodiment, the antenna segment K1, the first resonance portion 53, the second resonance portion 54 and the extension portion 55 together form the antenna ANT4, which is used for exciting a resonance mode to generate a radiation signal of a predetermined frequency band. In this embodiment, the resonance modes include a GPS mode and a WIFI2.4G/5G mode. Specifically, referring to fig. 48, when a current enters from the signal feeding source 56, the current flows through the first resonance part 53, directly flows into the antenna segment K1 through the first resonance part 53, then flows into the second resonance part 54, and finally is grounded through the second resonance part 54, so that the signal feeding source 56, the first resonance part 53, the antenna segment K1, and the second resonance part 54 form a loop antenna together, and the loop antenna excites the resonant frequency f in a half-wavelength manner₀The 1575MHz band, i.e. the GPS band (please refer to path X1).

When the current enters from the signal feeding source 56, the current flows through the first resonant portion 53, directly flows into the antenna segment K1 through the first resonant portion 53, and then flows into the extension portion 55, so that the signal feeding source 56, the first resonant portion 53, the antenna segment K1, and the extension portion 55 together form a monopole antenna, and the monopole antenna excites the resonant frequency f in a quarter-wavelength manner₁2400MHz, namely, WIFI2.4G band (please refer to path X2). In addition, the resonance frequency f₁Will also excite a resonance frequency f₂The frequency band of 5400MHz, namely the WIFI 5G frequency band.

It is to be appreciated that referring again to fig. 49, in the present embodiment, the antenna ANT4 forms a two-port network. The two ports include a first connecting arm Q1 and a second connecting arm Q2, and corresponding matching elements are arranged at the ports to form corresponding matching circuits 57, so that the resonant frequency band of the antenna ANT4 is effectively adjusted and optimized. Specifically, in one embodiment, the matching circuit 57 includes a first matching element 571, a second matching element 572, and a third matching element 573. One end of the first matching element 571 is electrically connected between the first connecting arm Q1 and the signal feeding source 56, and the other end is electrically connected to the back plate 512, i.e. to ground. One end of the second matching element 572 is electrically connected between the first matching element 571 and the first connection arm Q1, and the other end is electrically connected to the backplate 512, i.e. to ground. The third matching element 573 has one end electrically connected to the second connecting arm Q2 and the other end electrically connected to the back plate 512, i.e., grounded. In this embodiment, the first matching element 571 is an inductor, and the second matching element 572 and the third matching element 573 are both capacitors. It is to be understood that in other embodiments, the first matching element 571, the second matching element 572 and the third matching element 573 are not limited to the above-mentioned inductances and/or capacitances, but may also be other matching elements or combinations thereof.

Fig. 50 is a graph of the S-parameter (scattering parameter) of the antenna structure 500 when the extensions 55 are of different lengths. Wherein curve S501 is the S11 value of the antenna structure 500 when the extension 55 is the default length. Curve S502 is the S11 value for the antenna structure 500 when the extension 55 is increased by 2mm from the default length. Curve S503 is the S11 value for the antenna structure 500 when the extension 55 is reduced by 2mm from the default length. It is clear from the curves S501-S503 that when the length of the extension 55 is changed, the frequency point of the antenna structure 500 in WIFI2.4G/5G mode can be effectively changed, but the frequency point shift of the GPS mode has little influence.

Fig. 51 is a graph of S-parameters (scattering parameters) of the antenna structure 500 when the second matching element 572 is a capacitor and is set to different capacitance values. Curve S511 is the value of S11 of the antenna structure 500 when the second matching element 572 has a capacitance of 0.25 pF. Curve S512 is the value of S11 for the antenna structure 500 when the second matching element 572 has a capacitance of 0.5 pF. Curve S513 shows the value of S11 for the antenna structure 500 when the second matching element 572 has a capacitance of 1 pF. Curve S514 is the S11 value for the antenna structure 500 when the second matching element 572 is open. It is obvious from the curves S511-S514 that the second matching element 572 is mainly used for adjusting the bandwidth and the impedance matching of the antenna structure 500 in the WIFI2.4G/5G mode.

Fig. 52 is a graph of the S-parameter (scattering parameter) of the antenna structure 500 when the third matching element 573 is a capacitor and is set to different capacitance values. Where the curve S521 is the value of S11 of the antenna structure 500 when the third matching element 573 is a capacitor with a capacitance value of 3 pF. Curve S522 is the value of S11 for the antenna structure 500 when the third matching element 573 is a capacitor with a capacitance value of 2 pF. Curve S523 is the value of S11 for the antenna structure 500 when the third matching element 573 is a capacitor with a capacitance value of 4 pF. Curve S524 is the value of S11 for the antenna structure 500 when the third matching element 573 is a capacitor with a capacitance value of 5 pF. It is obvious from the curves S521-S524 that the third matching element 573 is mainly used to adjust the bandwidth and impedance matching of the antenna structure 500 in the GPS mode.

Fig. 53 is a graph of S-parameters (scattering parameters) of the antenna structure 500 when the first matching element 571 in the matching circuit 57 is an inductor with an inductance value of 10nH, the second matching element 372 is a capacitor with a capacitance value of 0.25pF, and the third matching element 573 is a capacitor with a capacitance value of 3 pF. Fig. 54 is a graph of the radiation efficiency of the antenna structure 500 when the first matching element 571 in the matching circuit 57 is an inductor with an inductance value of 10nH, the second matching element 372 is a capacitor with a capacitance value of 0.25pF, and the third matching element 573 is a capacitor with a capacitance value of 3 pF. Wherein, the curve S541 is the radiation efficiency of the antenna structure 500. Curve S542 is the total radiation efficiency of the antenna structure 500.

Obviously, as can be seen from fig. 53 and 54, the whole antenna structure 500 can achieve a multi-band antenna design, i.e., 1565-.

It is understood that, referring to fig. 55a to 55f, in other embodiments, the first resonant portion 53, the second resonant portion 54 and the extending portion 55 are not limited to the above-mentioned configuration, and other configurations may be adopted, as long as the first resonant portion 53, the second resonant portion 54 and the extending portion 55 are disposed at intervals, one of the first resonant portion 53 and the second resonant portion 54 is electrically connected to the signal feeding source 56, and the other one of the first resonant portion 53 and the second resonant portion 54 is grounded. For example, referring to fig. 55a, in other embodiments, the electrical connection point between the extension 55 and the antenna segment K1 is not limited to the position where the antenna segment K1 is adjacent to the first break 523, but may be located at the position where the antenna segment K1 is close to the first gap 521 or any other position.

Referring also to fig. 55b, it is understood that in other embodiments, the extension 55 has a T-shaped structure and can be electrically connected to the antenna segment K1 at any position of the antenna segment K1.

Referring also to FIG. 55c, it is understood that in other embodiments, the extension portion 55 includes a plurality of extension arms, such as extension arms 551 and 553 electrically connected to each other. The extension 55 is electrically connected to the antenna segment K1.

Referring to fig. 55d, it is understood that, in other embodiments, the extension portion 55 is coupled to the antenna segment K1 at a distance, and is electrically connected to the back plate 512, i.e., grounded.

Referring to fig. 55e, it can be understood that, in other embodiments, the connection relationship between the first resonance part 53 and the second resonance part 54 electrically connected to the signal feeding source 56 and the ground can be interchanged. For example, the first resonance part 53 is electrically connected to the back plate 512, i.e., grounded. And the second resonance part 54 is electrically connected to the signal feeding source 56.

Referring to fig. 55f, it is understood that, in other embodiments, the first resonant portion 53 is not electrically connected to the antenna segment K1, but is disposed at an interval. Thus, when a current enters from the signal feeding source 56, the current flows into the first resonance part 53 and is coupled to the antenna segment K1 through the first resonance part 53.

It is understood that in the above embodiments, the back plate 512 can serve as a ground for the antenna structure 500 and the wireless communication device 600. In another embodiment, a shielding cover (shielding mask) for shielding electromagnetic interference or a middle frame for supporting the display unit 601 may be disposed on a side of the display unit 601 facing the back plate 512. The shielding cover or the middle frame is made of metal materials. The shield or bezel may be coupled to the backplane 512 to serve as a ground for the antenna structure 500 and the wireless communication device 600. At each of the above-mentioned points of grounding, the shielding case or the bezel may replace the back plate 512 for grounding the antenna structure 500 or the wireless communication device 600. In another embodiment, the main circuit board of the wireless communication device 600 may be provided with a ground plane, which is grounded at each of the above places, and the ground plane may replace the back plate 512 for grounding the antenna structure 500 or the wireless communication device 600. The ground plane may be connected to the shield, center frame or the backplane 512.

As described above, the antenna structure 500 is provided with the slot 520, the first slot 521, the second slot 522, the first break 523 and the second break 524, so as to divide at least an antenna segment K1 from the front frame 511. The antenna structure 500 is further provided with a first resonant portion 53, a second resonant portion 54, an extension portion 55 and a signal feeding source 56, so that the first resonant portion 53, the second resonant portion 54, the extension portion 55 and the antenna segment K1 form an antenna ANT4, so as to generate a radiation signal in GPS, WIFI2.4G/5G band.

In addition, the antenna structure 500 is provided with the housing 51, and the slot 520, the first slot 521, the second slot 522, the first breakpoint 523 and the second breakpoint 524 on the housing 51 are all disposed on the front frame 511 and the side frame 513 and are not disposed on the back plate 512, so that the back plate 512 constitutes an all-metal structure, that is, there is no insulated slot, broken line or breakpoint on the back plate 512, and the back plate 512 can avoid the integrity and the aesthetic property of the back plate 512 being affected by the arrangement of the slot, the broken line or the breakpoint.

The antenna structures 100, 100a of the embodiments 1-2 and the antenna structures 300, 500 of the embodiments 3-4 can be applied to the same wireless communication device. For example, antenna structure 300 may be used as an upper antenna of the wireless communication device and antenna structure 100 or 100a may be used as a lower antenna of the wireless communication device. When the wireless communication apparatus transmits a wireless signal, the wireless communication apparatus transmits the wireless signal using the lower antenna. When the wireless communication device receives a wireless signal, the wireless communication device receives the wireless signal using the upper antenna together with the lower antenna. The wireless communication device may further include the antenna structure 500 to support more frequency bands, such as GPS and WIFI frequency bands.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention. Those skilled in the art can also make other changes and the like in the design of the present invention within the spirit of the present invention as long as they do not depart from the technical effects of the present invention. Such variations are intended to be included within the scope of the invention as claimed.

Claims (20)

1. An antenna structure comprises a shell, a first grounding part, a second grounding part, a coupling part, a radiation part, a first feed-in source and a second feed-in source, wherein the shell comprises a front frame, a back plate and a frame, the frame is clamped between the front frame and the back plate, the frame at least comprises a tail end part, a first side part and a second side part, the first side part and the second side part are respectively connected with two ends of the tail end part, a slot is arranged on the frame, a first gap, a second gap, a first breakpoint and a second breakpoint are arranged on the front frame, the first gap, the second gap, the first breakpoint and the second breakpoint are all communicated with the slot and extend to block the front frame, the slot, the first gap and the first breakpoint jointly block a first antenna segment from the shell, and the slot, the second gap and the second breakpoint jointly block a second antenna segment from the shell, one end of the first grounding part is electrically connected to the first antenna segment, the other end of the first grounding part is grounded, the second grounding part is arranged at an interval with the first grounding part, one end of the second grounding part is electrically connected to the first antenna segment, the other end of the second grounding part is grounded, one end of the coupling part is electrically connected to the first feed-in source and is arranged at an interval coupling with the first antenna segment, the current from the first feed-in source is coupled to the first antenna segment through the coupling part, the radiation part is arranged in the shell, one end of the radiation part is electrically connected to the second feed-in source, the other end of the radiation part is electrically connected to the second antenna segment, the coupling part comprises a first feed-in segment, a first coupling segment and a second coupling segment, one end of the first feed-in segment is electrically connected to the first feed-in source, the other end of the radiation part is electrically connected to the first, one end of the first coupling section is vertically connected to one end, far away from the first feed-in source, of the first feed-in section, the other end of the first coupling section extends along a direction parallel to the first side portion and close to the terminal portion, the second coupling section and the first coupling section are arranged in a coplanar manner, one end of the second coupling section is vertically connected to the end portion, far away from the first feed-in section, of the first coupling section and extends along directions parallel to the terminal portion and close to the first side portion and the second side portion respectively, and therefore a T-shaped structure is formed by the second coupling section and the first coupling section.

2. The antenna structure of claim 1, characterized in that: the slot is at least arranged at the tail end part, the first grounding part comprises a first grounding section and a first connecting section, one end of the first grounding section is grounded, one end of the first connecting section is electrically connected to the first grounding section and extends along a direction parallel to the first side part and close to the tail end part so as to be electrically connected with the first antenna section, the second grounding part comprises a second grounding section and a second connecting section, one end of the second grounding section is grounded, one end of the second connecting section is electrically connected to the second grounding section and extends along a direction parallel to the first side part and close to the tail end part so as to be electrically connected with the first antenna section, when current enters from the first feed-in source, the current flows through the coupling part, is coupled to the first antenna section through the coupling part and is grounded through the first grounding section and the second grounding section, and further exciting a first mode to generate a radiation signal of a first frequency band.

3. The antenna structure of claim 2, characterized in that: the first antenna segment, the first grounding portion, the second grounding portion, the coupling portion and the first feed-in source jointly form a first antenna, the first antenna comprises a matching circuit, and the matching circuit is electrically connected to the first grounding portion, the second grounding portion and the coupling portion, so that the frequency width and impedance matching of the first antenna are adjusted and optimized.

4. The antenna structure of claim 3, characterized in that: the matching circuit comprises a first matching element, a second matching element and a third matching element, wherein one end of the first matching element is electrically connected to the first feed-in section, the other end of the first matching element is electrically connected to the first feed-in source, one end of the second matching element is electrically connected to the first grounding section, the other end of the second matching element is grounded, one end of the third matching element is electrically connected to the second grounding section, and the other end of the third matching element is grounded.

5. The antenna structure of claim 4, characterized in that: the antenna structure further comprises a parasitic part, the parasitic part and the coupling part are arranged at intervals, and when current enters from the first feed-in source, the current flows through the coupling part and is coupled to the parasitic part through the coupling part, so that the high-frequency bandwidth of the first mode is widened.

6. The antenna structure of claim 5, characterized in that: the parasitic part comprises a third grounding section, a first parasitic section and a second parasitic section, one end of the third grounding section is vertically connected to the first parasitic section, the other end of the third parasitic section is grounded, one end of the first parasitic section is electrically connected to the third grounding section, the other end of the first parasitic section extends along a direction parallel to the second coupling section and close to the second side part, and the second parasitic section is vertically connected to one end of the first parasitic section far away from the third grounding section and extends along a direction parallel to the first side part and far away from the tail end part.

7. The antenna structure of claim 6, characterized in that: the matching circuit further includes a fourth matching element having one end electrically connected to the third ground segment and the other end grounded.

8. The antenna structure of claim 2, characterized in that: when the current enters from the second feed-in source, the current flows through the radiation part and flows to the second antenna segment through the radiation part, and then a second mode is excited to generate a radiation signal of a second frequency band, wherein the frequency of the first frequency band is higher than that of the second frequency band.

9. The antenna structure of claim 8, characterized in that: the radiation part comprises a second feed-in section, a fourth grounding section, a first radiation section and a second radiation section, one end of the second feed-in section is electrically connected to the second feed-in source, the other end of the second feed-in section is electrically connected to the first radiation section, one end of the fourth grounding section is grounded, the other end of the fourth grounding section is electrically connected to the first radiation section, one end of the first radiation section is vertically connected to one end of the second feed-in section far away from the second feed-in source and extends for a distance along a direction parallel to the terminal part and close to the first side part so as to be vertically connected with one end of the fourth grounding section far away from the backboard and then crosses over the fourth grounding section so as to continue to extend along a direction parallel to the terminal part and close to the first feed-in side part, one end of the second radiation section is connected to one end of the first radiation section, and the other end of the second radiation section extends along a direction parallel to the first side part and close to, until electrically connected to the second antenna segment.

10. The antenna structure of claim 9, characterized in that: the second antenna segment, the radiation part and the second feed-in source jointly form a second antenna, the second antenna comprises a switching circuit, and the switching circuit is electrically connected to the second feed-in segment and the fourth grounding segment so as to adjust the second frequency band.

11. The antenna structure of claim 10, characterized in that: the switching circuit comprises a first switching element and a second switching element, one end of the first switching element is electrically connected to the second feed-in section, the other end of the first switching element is electrically connected to the second feed-in source, one end of the second switching element is electrically connected to the fourth grounding section, and the other end of the second switching element is grounded.

12. The antenna structure of claim 11, characterized in that: the second antenna further comprises a filter circuit, wherein the filter circuit is electrically connected between the first switching element and the second feed-in source and used for suppressing a high-frequency harmonic mode and improving the isolation between the first antenna and the second antenna.

13. The antenna structure of claim 12, characterized in that: the filter circuit comprises an inductor, a first capacitor and a second capacitor, wherein the inductor is connected in series between the first switching element and the second feed-in source, one end of the first capacitor is electrically connected between the inductor and the second feed-in source, the other end of the first capacitor is grounded, one end of the second capacitor is electrically connected between the inductor and the first switching element, and the other end of the second capacitor is grounded.

14. The antenna structure of claim 12, characterized in that: the filter circuit comprises a first inductor, a second inductor and a capacitor, wherein the first inductor and the second inductor are connected in series between the first switching element and the second feed-in source, one end of the capacitor is electrically connected between the first inductor and the second inductor, and the other end of the capacitor is grounded.

15. The antenna structure of claim 1, characterized in that: insulating materials are filled in the open groove, the first gap, the second gap, the first break point and the second break point.

16. The antenna structure of claim 1, characterized in that: the back plate is a single metal sheet which is integrally formed, the back plate is directly connected with the frame, no gap exists between the back plate and the frame, and no insulating slot, broken line or breakpoint used for dividing the back plate is arranged on the back plate.

17. A wireless communication device comprising an antenna arrangement according to any of claims 1-16.

18. The wireless communications apparatus of claim 17, wherein: the wireless communication device further comprises a display unit, the front frame, the back plate and the frame form a shell of the wireless communication device, the front frame is provided with an opening for accommodating the display unit, the display unit is provided with a display plane, the display plane is exposed out of the opening, and the display plane and the back plate are arranged in parallel.

19. The wireless communications apparatus of claim 17, wherein: the wireless communication device further comprises an earphone interface module and a USB module, wherein a first opening and a second opening are formed in the frame, the first opening corresponds to the earphone interface module, and the earphone interface module is partially exposed out of the first opening; the second opening corresponds to the USB module for partially exposing the USB module from the second opening, the first and second grounding portions are respectively disposed at two sides of the earphone interface module, and the coupling portion is disposed between the first grounding portion and the USB module.

20. The wireless communications apparatus of claim 17, wherein: the wireless communication device further comprises a double-camera module and a flash lamp, and a through hole for exposing the double-camera module and the flash lamp is formed in the back plate.

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