Antenna structure and electronic equipment

Abstract

The invention provides an antenna structure and electronic equipment, and belongs to the technical field of antennas. The antenna structure comprises a radiation branch knot and a parasitic branch knot. The radiation branch knot and the parasitic branch knot are arranged in a head-to-head manner, a break joint structure is formed between the head of the radiation branch knot and the head of the parasitic branch knot, and the tail of the radiation branch knot and the tail of the parasitic branch knot are grounded respectively; a feeding point is arranged on the radiation branch knot; the antenna structure comprises a first working mode, a second working mode, a third working mode and a fourth working mode; the first working mode is a 1 / 4 wavelength IFA mode of the antenna, the second working mode is a 1 / 4 monopole mode from the feeding point to the head of the radiation branch knot, the third working mode is a 3 / 4 wavelength mode of the antenna, and the fourth working mode is a single loop mode from the feeding point to the tail of the radiation branch knot. The antenna structure can be arranged in a single-feed area such as a key area, and the environmental adaptability and universality of the antenna are improved.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an antenna structure and an electronic device. Background Art

[0002] With the development of mobile phone terminals, the antenna form has changed from external antenna to frame antenna. In order to make full use of the side space of the mobile phone, antennas are usually arranged in the button area (such as volume button and power button). The button area has a good holding environment in both one-handed and two-handed scenarios, and the antenna performance decreases less.

[0003] However, the antenna structure in the related art cannot meet the communication requirements of electronic devices due to the small selection range of the positions of the feeding point and the break. Summary of the invention

[0004] The present application provides an antenna structure and an electronic device, which can solve the problem that the antenna structure cannot meet the communication requirements of the electronic device due to the small selection range of the positions of the feeding point and the break.

[0005] The technical solution is as follows:

[0006] In one aspect, an antenna structure is provided, the antenna structure comprising: a radiating branch and a parasitic branch;

[0007] The radiation branch and the parasitic branch are arranged head to head, a fracture structure is formed between the head of the radiation branch and the head of the parasitic branch, and the tail of the radiation branch and the tail of the parasitic branch are grounded respectively;

[0008] A feeding point is provided on the radiation branch;

[0009] The antenna structure includes a first working mode, a second working mode, a third working mode and a fourth working mode; the first working mode is a 1 / 4 wavelength IFA mode of the antenna, the second working mode is a 1 / 4 monopole mode from the feeding point to the head of the radiating branch, the third working mode is a 3 / 4 wavelength mode of the antenna, and the fourth working mode is a single loop mode from the feeding point to the tail of the radiating branch.

[0010] In some embodiments, when the antenna structure is in the first operating mode, the antenna structure is used to cover a first frequency band.

[0011] In some embodiments, when the antenna structure is in the second working mode, the antenna structure is used to cover a second frequency band; the frequency of the second frequency band is greater than the frequency of the first frequency band.

[0012] In some embodiments, when the antenna structure is in the second working mode and the third working mode, the antenna structure is used to cover a third frequency band; the frequency of the third frequency band is greater than the frequency of the second frequency band.

[0013] In some embodiments, when the antenna structure is in the third working mode and the fourth working mode, the antenna structure is used to cover a fourth frequency band; the frequency of the fourth frequency band is greater than the frequency of the third frequency band.

[0014] In some embodiments, the first frequency band includes N28 frequency band, N5 frequency band, and N8 frequency band; the second frequency band includes B3 frequency band and B1 frequency band; the third frequency band includes B40 frequency band and B7 frequency band; and the fourth frequency band includes N78 frequency band.

[0015] In some embodiments, the distance between the feeding point and the tail of the radiation branch is a, and the value range of a is 16-20 mm;

[0016] The distance between the feeding point and the head of the radiation branch is b, and the value range of b is 16-20 mm;

[0017] The distance between the head and the tail of the parasitic branch is c, and the value range of c is 4-6 mm.

[0018] In some embodiments, the antenna structure further includes a matching circuit, an input end of the matching circuit is used to connect to a radio frequency circuit, and an output end of the matching circuit is electrically connected to the feeding point.

[0019] In some embodiments, the matching circuit includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first inductor, a second inductor, and a switch unit;

[0020] The switch unit includes a first terminal, a second terminal, a third terminal, a fourth terminal and a common terminal;

[0021] One end of the first capacitor is electrically connected to the input end, and the other end of the first capacitor is grounded; one end of the first inductor is electrically connected to the input end, and the other end of the first inductor is electrically connected to the second capacitor, the second inductor and the output end in sequence;

[0022] The first terminal is grounded through the third capacitor, the second terminal is grounded through the fourth capacitor, the third terminal is suspended, the fourth terminal is electrically connected to the output end, and the common terminal is electrically connected between the second capacitor and the second inductor.

[0023] In some embodiments, when the antenna structure is in the first working mode and the first terminal is connected to the common terminal, the antenna structure covers the N28 frequency band;

[0024] When the antenna structure is in the first working mode and the second terminal and the fourth terminal are respectively connected to the common terminal, the antenna structure covers the N5 frequency band;

[0025] When the antenna structure is in the first working mode and the fourth terminal is connected to the common terminal, the antenna structure covers the N8 frequency band;

[0026] When the antenna structure is in the second working mode and the first terminal is connected to the common terminal, the antenna structure covers the B3 frequency band;

[0027] When the antenna structure is in the second working mode and the first terminal and the fourth terminal are respectively connected to the common terminal, the antenna structure covers the B1 frequency band;

[0028] When the antenna structure is in the second working mode and the third working mode and the fourth terminal is connected to the common terminal, the antenna structure covers the B40 frequency band and the B7 frequency band;

[0029] When the antenna structure is in the third working mode and the fourth working mode and the fourth terminal is connected to the common terminal, the antenna structure covers the N78 frequency band.

[0030] On the other hand, an electronic device is provided, wherein the electronic device comprises the antenna structure described in the present application.

[0031] The beneficial effects of the technical solution provided by this application include at least:

[0032] The antenna structure of the present application has only one feeding point for the radiating branches and the parasitic branches. By utilizing the mutual cooperation of the frame branches and the parasitic branches, a variety of working modes that can cover more working frequency bands can be constructed, so that the antenna structure can be arranged in a single feeding area such as the button area, thereby improving the environmental adaptability and versatility of the antenna structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1is a structural schematic diagram of an antenna structure provided in an embodiment of the present application;

[0035] Figure 2 is a schematic diagram of the structure of a circuit module provided in an embodiment of the present application;

[0036] Figure 3 is a schematic diagram of a partial structure of an electronic device provided in an embodiment of the present application;

[0037] Figure 4 is the current distribution of the antenna structure provided by the embodiment of the present application in the first working mode;

[0038] Figure 5 is the current distribution of the antenna structure provided by the embodiment of the present application in the second working mode;

[0039] Figure 6 is the current distribution of the antenna structure provided in the embodiment of the present application in the third working mode;

[0040] Figure 7 is the current distribution of the antenna structure provided by the embodiment of the present application in the third working mode and the fourth working mode;

[0041] Figure 8 is the return loss of the antenna structure provided in the embodiment of the present application in the first frequency band;

[0042] Fig. 9 This is the return loss of the antenna structure provided in the embodiment of the present application in the second frequency band, the third frequency band and the fourth frequency band.

[0043] The reference numerals in the figures represent respectively:

[0044] 1. Radiating branches;

[0045] 11. Feeding point;

[0046] 2. Parasitic branches;

[0047] 3. Fracture structure;

[0048] 4. Matching circuit;

[0049] 401, input end; 402, output end;

[0050] 41. a first capacitor; 42. a second capacitor; 43. a third capacitor; 44. a fourth capacitor; 45. a first inductor; 46. a second inductor; 47. a switch unit;

[0051] 471, first terminal; 472, second terminal; 473, third terminal; 474, fourth terminal; 475, common terminal;

[0052] 5. RF circuit;

[0053] 6. Button assembly; 61. Volume button; 62. Power button;

[0054] 7. Rear camera module;

[0055] 8. Battery module. DETAILED DESCRIPTION

[0056] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0057] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] It should be understood that in this application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as a form of connection between different components in the circuit structure through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals. "Communication connection" can refer to electrical signal transmission, including wireless communication connection and wired communication connection. Wireless communication connection does not require a physical medium and does not belong to a connection relationship that limits the product structure. "Connection" and "connected" can both refer to a mechanical connection relationship or a physical connection relationship, that is, A is connected to B or A is connected to B, which can mean that there is a fastening component (such as screws, bolts, rivets, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0059] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0060] In the related technology, the antenna is placed at the button of the mobile phone (volume button and power button), making full use of the side space of the mobile phone. The antenna will not be grasped by one hand or both hands, and the antenna performance will be less reduced. However, due to the particularity of the button position, the antenna length, the position of the gap and the clearance width are obviously limited. The performance of the antenna here is poor, and it is difficult to meet the main radiation performance. The antenna performance is poor and cannot bear the radiation capacity of the main antenna to meet the internal and operator standards.

[0061] Since this area is close to the rear camera module, there is only a very narrow circuit board between the rear camera module and the battery module to connect the antenna to the upper frame spring. In addition, due to the buttons, only one upper frame spring can be arranged between two membrane buttons (Metal Dome Array) as a feeding point, and the adjustable range is small. At the same time, the antenna gap can only be selected on the outside of the button, which makes the antenna unable to cover the LMHB+N78 frequency band.

[0062] Therefore, the present application provides an antenna structure, which utilizes the mutual cooperation of the frame branches and the parasitic branches to construct a variety of working modes that completely cover the LMHB+N78 frequency band, so that the LMHB+N78 antenna can be arranged in a single feed area such as the button area, thereby improving the environmental adaptability and versatility of the antenna.

[0063] The technical solution provided in this application is applicable to electronic devices that adopt one or more of the following communication technologies: Bluetooth (Blue Tooth, BT) communication technology, Global Positioning System (Global Positioning System, GPS) communication technology, Wireless Fidelity (Wireless Fidelity, WiFi) communication technology, Global System For mobile communications (Global System For mobile Communications, GSM) communication technology, Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA) communication technology, Long Term Evolution (Long Term Evolution, LTE) communication technology, 5G communication technology and other future communication technologies.

[0064] The electronic device may be referred to as user equipment (UE) or terminal, etc. For example, the electronic device may be a portable android device (PAD), a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device, a vehicle-mounted device, a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc., a mobile terminal or a fixed terminal. In the embodiments of the present application, the form of the terminal device is not specifically limited.

[0065] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0066] On the one hand, combined with Figure 1-3 As shown, this embodiment provides an antenna structure, which includes: a radiating branch 1 and a parasitic branch 2; the radiating branch 1 and the parasitic branch 2 are arranged head to head, a break structure 3 is formed between the head of the radiating branch 1 and the head of the parasitic branch 2, and the tail of the radiating branch 1 and the tail of the parasitic branch 2 are grounded respectively; a feeding point 11 is provided on the radiating branch 1.

[0067] The antenna structure includes a first working mode, a second working mode, a third working mode and a fourth working mode; the first working mode is a 1 / 4 wavelength IFA mode of the antenna, the second working mode is a 1 / 4 monopole mode from the feeding point 11 to the head of the radiating branch 1, the third working mode is a 3 / 4 wavelength mode of the antenna, and the fourth working mode is a single loop mode from the feeding point 11 to the tail of the radiating branch 1.

[0068] In the antenna structure of this embodiment, the radiating branch 1 and the parasitic branch 2 are only provided with a feeding point 11. By utilizing the mutual cooperation of the radiating branch 1 and the parasitic branch 2, a variety of working modes that can cover more working frequency bands can be constructed, so that the antenna structure can be arranged in a single feeding area such as a button area, thereby improving the environmental adaptability and versatility of the antenna.

[0069] Among them, the heads of the radiating branches 1 and the parasitic branches 2 are the ends of the radiating branches 1 and the parasitic branches 2 that are close to each other, and the tails of the radiating branches 1 and the parasitic branches 2 are the ends of the radiating branches 1 and the parasitic branches 2 that are away from each other.

[0070] Exemplarily, the antenna structure of this embodiment can achieve coverage of the LMHB+N78 frequency band through the cooperation of the radiation branch 1, the frame branch and the parasitic branch 2.

[0071] refer to Figure 3 As shown, in some possible implementations, a key assembly 6 is provided on the radiation branch 1 , key 6 contacts are provided at both ends of the key assembly 6 , and the feeding point 11 is located between the upper and lower key 6 contacts.

[0072] In some possible implementations, the functions corresponding to the button assembly 6 include but are not limited to a volume up button 6, a volume down button 6, a one-button mute button 6, and a display light on / off button 6, etc.

[0073] The display screen on / off button 6 can also be used to shut down and restart the electronic device.

[0074] The key assembly 6 is connected to a main circuit board of the electronic device through a corresponding flexible printed circuit board (FPC), and the main circuit board is, for example, a printed circuit board (PCB).

[0075] For the sake of distinction, in this embodiment, the printed circuit board can be referred to as the main circuit board, and the flexible circuit board can be referred to as the sub-circuit board. By pressing the key assembly 6, the sub-circuit board generates a control instruction and transmits the control instruction to the main circuit board of the electronic device.

[0076] Since the button assembly 6 is arranged along the side of the electronic device, in order to adapt to the internal component arrangement of the side area and to avoid increasing the size of the side frame as much as possible, the button assembly 6 is adaptively designed according to the arrangement of the components in the side area of ​​the electronic device, and is designed as a strip structure extending along the side. The strip design is conducive to adapting to complex arrangement directions and occupies less space.

[0077] See also Figure 3 As shown, exemplarily, the button assembly 6 includes a volume button 61 and a power button 62, wherein the volume button 61 is located on the radiation branch 1, and the upper and lower ends of the volume button 61 are respectively provided with button contacts for increasing the volume and decreasing the volume, and the feeding point 11 is located between the upper and lower button contacts. The power button 62 is located below the volume button 61, and can be located on the radiation branch 1, or outside the radiation branch 1.

[0078] In some other possible implementations, the radiation branch 1 and the parasitic branch 2 are integrally formed on the middle frame structure of the electronic device. Optionally, the middle frame structure includes an outer frame portion and a middle plate portion, the outer frame portion is arranged around the edge of the middle plate portion, and a groove is provided on the inner side of the outer frame portion, so that a part of the outer frame portion is separated from the middle plate portion, and then the fracture structure 3 is processed, and this part of the outer frame portion separated from the middle plate portion forms a radiation branch 1 and a parasitic branch 2 in this embodiment, one end of which is suspended (for example, the first end and the third end), and the other end is still connected to the middle plate structure. The ends of the radiation branch 1 and the parasitic branch 2 that are not separated from the middle frame structure can just serve as the grounding ends of the radiation branch 1 and the parasitic branch 2 (for example, the second end and the fourth end).

[0079] Alternatively, the radiation branch 1 and the parasitic branch 2 are not integrally formed with the middle frame structure, that is, the radiation branch 1 and the parasitic branch 2 are completely suspended on one side of the middle frame structure and are insulated and connected to the middle frame structure through assembly, plastic coating, etc. In this case, the grounding of the radiation branch 1 and the parasitic branch 2 can be achieved through a grounding circuit and a conductive spring.

[0080] In some possible implementations, the feeding point 11 is directly or indirectly connected to the main circuit board of the terminal device, and can be used to convert the operation of pressing these button components 6 into electrical signals or other required forms of data signals according to a certain rule, and then transmit them to the main circuit board of the terminal device through its own internal wiring, thereby meeting the requirements of recognition, generation, transmission, processing, storage, display, recording and control of relevant user operation instructions.

[0081] Exemplarily, the main circuit board can be regarded as the mainboard of the terminal device, which includes a baseband part, a radio frequency component and other parts. The baseband part includes a baseband chip and a power management chip, etc. The radio frequency component includes a radio frequency processor and a radio frequency power amplifier module, etc., which are responsible for transmitting and receiving signals. Other parts include a CPU, memory and various controllers, etc., as well as interfaces for components such as microphones, earpieces, speakers, cameras, and display screens.

[0082] In the radio frequency component, the main circuit board is provided with a feeding point 11 for realizing signal reception and transmission. The feeding point 11 has an antenna spring, and the feeding point 11 is electrically connected to the feeding end of the radiating antenna through the antenna spring.

[0083] In some embodiments, when the antenna structure is in the first working mode, the antenna structure is used to cover a first frequency band. Optionally, the first frequency band includes N28 frequency band (700 MHz), N5 frequency band (850 MHz) and N8 frequency band (900 MHz).

[0084] refer to Figure 4 , Figure 4The figure shows the current distribution in the antenna structure in the first working mode. It can be seen from the figure that the current is mainly distributed between the feeding point 11 and the tail of the radiation branch 1, indicating that the antenna structure can achieve coverage of the first frequency band.

[0085] In some embodiments, when the antenna structure is in the second working mode, the antenna structure is used to cover a second frequency band; the frequency of the second frequency band is greater than the frequency of the first frequency band. Optionally, the second frequency band includes B3 frequency band (1800 MHz) and B1 frequency band (2100 MHz).

[0086] refer to Figure 5 , Figure 5 The figure shows the current distribution in the antenna structure in the second working mode. It can be seen from the figure that the current is mainly distributed between the feeding point 11 and the head of the radiation branch 1, indicating that the antenna structure can achieve coverage of the second frequency band.

[0087] In some embodiments, when the antenna structure is in the second working mode and the third working mode, the antenna structure is used to cover a third frequency band; the frequency of the third frequency band is greater than the frequency of the second frequency band. Optionally, the third frequency band includes B40 frequency band (2.3 GHz) and B7 frequency band (2.6 GHz).

[0088] refer to Figure 6 , Figure 6 The current distribution in the antenna structure in the third working mode is shown. It can be seen from the figure that the current is distributed between the feeding point 11 and the head of the radiating branch 1, and between the feeding point 11 and the tail of the radiating branch 1. Figure 5 As shown, it is shown that the antenna structure can achieve coverage of the third frequency band.

[0089] In some embodiments, when the antenna structure is in the third working mode and the fourth working mode, the antenna structure is used to cover a fourth frequency band; the frequency of the fourth frequency band is greater than the frequency of the third frequency band. Optionally, the fourth frequency band includes the N78 frequency band (3.5 GHz).

[0090] refer to Figure 7 , Figure 7 The current distribution in the antenna structure in the third working mode and the fourth working mode is shown. It can be seen from the figure that the current is mainly distributed between the feeding point 11 and the head of the radiating branch 1, and on the parasitic branch 2, indicating that the antenna structure can achieve coverage of the fourth frequency band.

[0091] Combination Figure 1As shown, in some embodiments, the distance between the feeding point 11 and the tail of the radiating branch 1 is a, and the value range of a is 16-20mm; the distance between the feeding point 11 and the head of the radiating branch 1 is b, and the value range of b is 16-20mm; the distance between the head and the tail of the parasitic branch 2 is c, and the value range of c is 4-6mm.

[0092] When the size of the antenna structure meets the above requirements, the antenna structure can construct the above four working modes and achieve coverage of the LMHB+N78 frequency band.

[0093] In some possible implementations, the distance a between the feeding point 11 and the tail of the radiation branch 1 is, for example, 16 mm, 16.5 mm, 17 mm, 17.5 mm, 18 mm, 18.5 mm, 19 mm, 19.5 mm, 20 mm, etc. Optionally, a=18 mm.

[0094] In some other possible implementations, the distance b between the feeding point 11 and the head of the radiation branch 1 is, for example, 16 mm, 16.5 mm, 17 mm, 17.5 mm, 18 mm, 18.5 mm, 19 mm, 19.5 mm, 20 mm, etc. Optionally, a=18 mm.

[0095] In some other possible implementations, the distance c between the head and the tail of the parasitic branch 2 (ie, the length of the parasitic branch 2) is, for example, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc. Optionally, c=5 mm.

[0096] Combination Figure 2 As shown, in some embodiments, the antenna structure further includes a matching circuit 4 , an input end 401 of the matching circuit 4 is used to connect to the radio frequency circuit 5 , and an output end 402 of the matching circuit 4 is electrically connected to the feeding point 11 .

[0097] The matching circuit 4 can be used to achieve different matching types, introduce a new working mode for the antenna structure, and achieve the frequency coverage of LMHB+N78.

[0098] Combination Figure 2 As shown, in some embodiments, the matching circuit 4 includes a first capacitor 41, a second capacitor 42, a third capacitor 43, a fourth capacitor 44, a first inductor 45, a second inductor 46 and a switch unit 47; the switch unit 47 includes a first terminal 471, a second terminal 472, a third terminal 473, a fourth terminal 474 and a common terminal 475.

[0099] One end of the first capacitor 41 is electrically connected to the input terminal 401 , and the other end of the first capacitor 41 is grounded; one end of the first inductor 45 is electrically connected to the input terminal 401 , and the other end of the first inductor 45 is electrically connected to the second capacitor 42 , the second inductor 46 and the output terminal 402 in sequence.

[0100] The first terminal 471 is grounded through the third capacitor 43 , the second terminal 472 is grounded through the fourth capacitor 44 , the third terminal 473 is suspended, the fourth terminal 474 is electrically connected to the output end 402 , and the common terminal 475 is electrically connected between the second capacitor 42 and the second inductor 46 .

[0101] Through the above arrangement, the matching circuit 4 can achieve different matching types, introduce a new working mode for the antenna structure, and achieve the frequency coverage of LMHB+N78.

[0102] Combination Figure 2 As shown, in some embodiments, the antenna structure is in the first working mode, and when the first terminal 471 is connected to the common terminal 475, the antenna structure covers the N28 frequency band. It should be noted that when the antenna structure covers the N28 frequency band, only the first terminal 471 is connected to the common terminal 475, and the second terminal 472, the third terminal 473 and the fourth terminal 474 are in the initial disconnected state by default. In the following working modes, the terminals not mentioned are all regarded as the initial state, that is, the disconnected state.

[0103] When the antenna structure is in the first working mode and the second terminal 472 and the fourth terminal 474 are respectively connected to the common terminal 475 , the antenna structure covers the N5 frequency band.

[0104] When the antenna structure is in the first working mode and the fourth terminal 474 is connected to the common terminal 475 , the antenna structure covers the N8 frequency band.

[0105] When the antenna structure is in the second working mode and the first terminal 471 is connected to the common terminal 475 , the antenna structure covers the B3 frequency band.

[0106] When the antenna structure is in the second working mode and the first terminal 471 and the fourth terminal 474 are respectively connected to the common terminal 475 , the antenna structure covers the B1 frequency band.

[0107] When the antenna structure is in the second working mode and the third working mode and the fourth terminal 474 is connected to the common terminal 475, the antenna structure covers the B40 frequency band and the B7 frequency band.

[0108] When the antenna structure is in the third working mode and the fourth working mode and the fourth terminal 474 is connected to the common terminal 475, the antenna structure covers the N78 frequency band.

[0109] refer to Figure 8 , 9,in Figure 8 The return loss (S11) of the antenna structure in the first frequency band is shown. It can be seen from the figure that the S11 values ​​of the marked points 1-3 are all lower than -12dB, indicating that the antenna structure can cover the first frequency band. Fig. 9 The return loss of the antenna structure in the second frequency band, the third frequency band and the fourth frequency band is shown. It can be seen from the figure that the S11 values ​​of the marked points 1-4 are all lower than -6dB, indicating that the antenna structure can cover the second frequency band, the third frequency band and the fourth frequency band.

[0110] On the other hand, combined Figure 3 As shown, this embodiment provides an electronic device, and the electronic device includes the antenna structure of the present application.

[0111] The electronic device of this embodiment adopts the antenna structure of the present application and has all the beneficial technical effects of all the embodiments herein.

[0112] In some possible implementations, the terminal device may include a radio frequency (RF) circuit, and the RF circuit 5 is electrically connected to the antenna structure via a matching circuit 4 .

[0113] The radio frequency circuit 5 can be used for receiving and sending signals during the process of sending and receiving information or making calls. In particular, after receiving the downlink information of the base station, it is handed over to one or more processors for processing; in addition, the data related to the uplink is sent to the base station. In addition, the radio frequency circuit 5 can also communicate with the network and other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to Global System of Mobilecommunication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), etc.

[0114] In some other possible implementations, the electronic device also includes a rear camera module 7 and a battery module 8, wherein the rear camera module 7 is located on the inner side of the upper end of the antenna structure, the battery module 8 is located on the inner side of the lower end of the antenna structure, and the feeding point 11 is located between the rear camera module 7 and the battery module 8.

[0115] It should be pointed out that in the description of this application, it should be explained that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0116] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0117] In the description of this specification, the reference terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application.

[0118] The above description is only an embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. An antenna structure, characterized in that: The antenna structure comprises: a radiation branch (1) and a parasitic branch (2); The radiation branch (1) and the parasitic branch (2) are arranged head to head, a fracture structure (3) is formed between the head of the radiation branch (1) and the head of the parasitic branch (2), and the tail of the radiation branch (1) and the tail of the parasitic branch (2) are grounded respectively; The radiation branch (1) is provided with a feeding point (11); The antenna structure comprises a first working mode, a second working mode, a third working mode and a fourth working mode; the first working mode is a 1 / 4 wavelength IFA mode of the antenna, the second working mode is a 1 / 4 monopole mode from the feeding point (11) to the head of the radiating branch (1), the third working mode is a 3 / 4 wavelength mode of the antenna, and the fourth working mode is a single loop mode from the feeding point (11) to the tail of the radiating branch (1).

2. The antenna structure according to claim 1, characterized in that: When the antenna structure is in the first working mode, the antenna structure is used to cover a first frequency band.

3. The antenna structure according to claim 2, characterized in that: When the antenna structure is in the second working mode, the antenna structure is used to cover a second frequency band; the frequency of the second frequency band is greater than the frequency of the first frequency band.

4. The antenna structure according to claim 3, characterized in that: When the antenna structure is in the second working mode and the third working mode, the antenna structure is used to cover a third frequency band; the frequency of the third frequency band is greater than the frequency of the second frequency band.

5. The antenna structure according to claim 4, characterized in that: When the antenna structure is in the third working mode and the fourth working mode, the antenna structure is used to cover a fourth frequency band; the frequency of the fourth frequency band is greater than the frequency of the third frequency band.

6. The antenna structure according to claim 5, characterized in that: The first frequency band includes the N28 frequency band, the N5 frequency band, and the N8 frequency band; the second frequency band includes the B3 frequency band and the B1 frequency band; the third frequency band includes the B40 frequency band and the B7 frequency band; and the fourth frequency band includes the N78 frequency band.

7. The antenna structure according to claim 5, characterized in that: The distance between the feeding point (11) and the tail of the radiation branch (1) is a, and the value range of a is 16-20 mm; The distance between the feeding point (11) and the head of the radiation branch (1) is b, and the value range of b is 16-20 mm; The distance between the head and the tail of the parasitic branch (2) is c, and the value range of c is 4-6 mm.

8. The antenna structure according to any one of claims 1 to 7, characterized in that: The antenna structure also includes a matching circuit (4), wherein an input end (401) of the matching circuit (4) is used to connect to a radio frequency circuit (5), and an output end (402) of the matching circuit (4) is electrically connected to the feeding point (11).

9. The antenna structure according to claim 8, characterized in that: The matching circuit (4) comprises a first capacitor (41), a second capacitor (42), a third capacitor (43), a fourth capacitor (44), a first inductor (45), a second inductor (46) and a switch unit (47); The switch unit (47) comprises a first terminal (471), a second terminal (472), a third terminal (473), a fourth terminal (474) and a common terminal (475); One end of the first capacitor (41) is electrically connected to the input end (401), and the other end of the first capacitor (41) is grounded; one end of the first inductor (45) is electrically connected to the input end (401), and the other end of the first inductor (45) is electrically connected to the second capacitor (42), the second inductor (46) and the output end (402) in sequence; The first terminal (471) is grounded via the third capacitor (43), the second terminal (472) is grounded via the fourth capacitor (44), the third terminal (473) is suspended, the fourth terminal (474) is electrically connected to the output end (402), and the common terminal (475) is electrically connected between the second capacitor (42) and the second inductor (46).

10. The antenna structure according to claim 9, characterized in that: When the antenna structure is in the first working mode and the first terminal (471) is connected to the common terminal (475), the antenna structure covers the N28 frequency band; When the antenna structure is in the first working mode and the second terminal (472) and the fourth terminal (474) are respectively connected to the common terminal (475), the antenna structure covers the N5 frequency band; When the antenna structure is in the first working mode and the fourth terminal (474) is connected to the common terminal (475), the antenna structure covers the N8 frequency band; When the antenna structure is in the second working mode and the first terminal (471) is connected to the common terminal (475), the antenna structure covers the B3 frequency band; When the antenna structure is in the second working mode and the first terminal (471) and the fourth terminal (474) are respectively connected to the common terminal (475), the antenna structure covers the B1 frequency band; When the antenna structure is in the second working mode and the third working mode, and the fourth terminal (474) is connected to the common terminal (475), the antenna structure covers the B40 frequency band and the B7 frequency band; When the antenna structure is in the third working mode and the fourth working mode, and the fourth terminal (474) is connected to the common terminal (475), the antenna structure covers the N78 frequency band.

11. An electronic device, characterized in that: The electronic device package comprises the antenna structure according to any one of claims 1 to 10.

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