Electronic device

Abstract

The invention discloses an electronic device, which comprises a device body, a middle frame of the device body comprises a target metal section, and the target metal section is used as a first antenna; the first antenna comprises a first branch knot and a second branch knot, and a target gap is formed between the first branch knot and the second branch knot; the second antenna is located in the device body, the second antenna is parallel and opposite to the local part of the first antenna and is connected with the local part of the first antenna through a feed point, and the feed point is connected with the length midpoint of the second antenna.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and particularly to an electronic device with a wireless communication function. Background Art

[0002] With the continuous development of science and technology, more and more electronic devices with wireless communication functions are widely used in people's daily life and work, bringing great convenience to people's daily life and work, and becoming an indispensable important tool for people today.

[0003] The main component for an electronic device to achieve wireless communication function is the antenna. In conventional electronic devices, limited by the internal layout space, a linear polarization antenna with an electric field vibrating along a single plane is generally used, and the linear polarization antenna is easily affected by the communication environment, resulting in poor communication performance of the electronic device. Summary of the Invention

[0004] In view of the above problems, this application provides an electronic device. The specific solution is as follows:

[0005] An electronic device, comprising:

[0006] A device body, the middle frame of the device body includes a target metal section, and the target metal section is used as the first antenna; the first antenna includes a first branch and a second branch, and there is a target gap between the first branch and the second branch;

[0007] A second antenna located inside the device body, the second antenna is locally parallel and opposite to the first antenna, and is locally connected to the first antenna through a feeding point, and the feeding point connects the midpoint of the length of the second antenna.

[0008] Optionally, in the above electronic device, there are a first gap and a second gap on the middle frame;

[0009] The part of the middle frame between the first gap and the second gap is the target metal section;

[0010] The part of the middle frame between the first gap and the target gap is the first branch; the first branch includes an integrated first sub-metal section and a second sub-metal section; the first sub-metal section is adjacent to the target gap and is parallel and opposite to the second antenna;

[0011] The part of the middle frame between the target gap and the second gap is the second branch.

[0012] Optionally, in the above electronic device, the second sub-metal section includes at least two sequentially arranged grounding short-circuit points, which are used to make the first branch have multiple different current paths.

[0013] Optionally, in the above-mentioned electronic device, the first antenna can transmit and receive radio frequency signals in the first frequency band; the center wavelength of the radio frequency signals in the first frequency band is the target wavelength;

[0014] The length of the second antenna is not less than one-fourth of the target wavelength and less than one-half of the target wavelength.

[0015] Optionally, in the above-mentioned electronic device, the second stub has a first ground short point connected to an adjustment circuit, and the adjustment circuit is used to adjust the impedance and axial ratio;

[0016] The distance between the first ground short point and the target slot is less than the distance to the second slot.

[0017] Optionally, in the above-mentioned electronic device, the distance between the feed point and the target slot is d2;

[0018] The distance between the target slot and the first ground short point is d3;

[0019] Wherein, d2 ≤ d3.

[0020] Optionally, in the above-mentioned electronic device, the first antenna can transmit and receive radio frequency signals in the first frequency band; the center wavelength of the radio frequency signals in the first frequency band is the target wavelength;

[0021] The second stub further includes a second ground short point, and the first ground short point is located between the target slot and the second ground short point;

[0022] The distance from the second ground short point to the second slot is not less than one-fourth of the target wavelength.

[0023] Optionally, in the above-mentioned electronic device, the middle frame includes a target vertex angle and a first side and a second side forming the target vertex angle, the first slot is located on the first side, the second slot is located on the second side, and the target slot is located between the target vertex angle and the second slot;

[0024] Wherein, the part between the target vertex angle and the target slot is the first sub-metal segment, and the part between the first slot and the target vertex angle is the second sub-metal segment.

[0025] Optionally, in the above-mentioned electronic device, the first sub-metal segment is adapted to the length of the second antenna and is less than the length of the second sub-metal segment.

[0026] Optionally, in the above-mentioned electronic device, the first antenna can transmit and receive radio frequency signals in the first frequency band; the center wavelength of the radio frequency signals in the first frequency band is the target wavelength;

[0027] The distance between the feed point and the target slot is greater than or equal to one-fourth of the target wavelength and less than or equal to one-half of the target wavelength;

[0028] Or, the length of the first branch is less than the length of the second branch;

[0029] Or, the length of the first branch is not less than one - quarter of the target wavelength and less than three - quarters of the target wavelength;

[0030] Or, the length of the second branch is not less than one - half of the target wavelength and less than three - halves of the target wavelength. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0032] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present application can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present application can produce, should still fall within the scope covered by the technical content disclosed in the present application.

[0033] Figure 1 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

[0034] Figure 2 It is a partial enlarged view of an electronic device provided by an embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of the current distribution of an antenna in an electronic device provided by an embodiment of the present application at 0° phase;

[0036] Figure 4 It is a schematic diagram of the current distribution of an antenna in an electronic device provided by an embodiment of the present application at 90° phase;

[0037] Figure 5 It is an axial ratio curve graph of a circularly polarized antenna in an electronic device provided by an embodiment of the present application;

[0038] Figure 6 It is a gain direction graph of a circularly polarized antenna in an electronic device provided by an embodiment of the present application in the XOY plane.

[0039] Reference Numerals:

[0040] 01 - Third grounding short - circuit point; 02 - Fourth grounding short - circuit point; 03 - Feeding point; 04 - Second antenna; 05 - First stub; 06 - First grounding short - circuit point; 07 - Second stub; 08 - Second grounding short - circuit point; 09 - Clearance area; 10 - Middle frame; 11 - Device body; 12 - Target metal segment; 13 - First antenna; 14 - Target gap; 15 - First gap; 16 - Second gap; 17 - First sub - metal segment; 18 - Second sub - metal segment; 19 - Metal ground; 20 - Third gap. Detailed implementation manners

[0041] The embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Those of ordinary skill in the art can know that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0042] As described in the background art, in an electronic device, due to the limited internal layout space, a linearly polarized antenna with an electric field vibrating along a single plane is generally used. However, a linearly polarized antenna is easily affected by the communication environment, resulting in poor communication performance of the electronic device.

[0043] Taking a smart watch as an example, satellite positioning and trajectory recording are important functions of a smart watch. Due to the occlusion of surface buildings, the transmission efficiency from the satellite to the ground is reduced. The transmitting antenna from the satellite to the ground generally adopts the form of right - hand circular polarization. Then, when communicating with the ground, there is a polarization matching problem. In addition, if a WIFI antenna has circular polarization characteristics, it can provide a good user experience. Circularly polarized antennas have advantages such as high anti - interference, reduced polarization loss, overcoming multipath effects, miniaturization, and broadband characteristics. However, due to the limited volume and industrial design of the smart watch, it is difficult to implement a single - band circularly polarized antenna, and it is even more difficult for a multi - band circularly polarized antenna. Therefore, realizing a multi - band circularly polarized antenna for wearable devices is a technical problem urgently to be solved in the industry.

[0044] It should be noted that in the embodiments of the present application, the electronic device is not limited to a smart watch, and can also be a mobile terminal with wireless communication functions such as a smart bracelet, a smart phone, or smart glasses. The embodiments of the present application do not limit the type of the electronic device.

[0045] To integrate a circularly polarized antenna in an electronic device, the first solution is to design an antenna structure in the electronic device that can simultaneously excite the CM mode (common mode) and the DM mode (differential mode). This solution can utilize the conductive part of the device frame as a radiator. Specifically, the first radiator of the antenna includes a conductor part of the frame between the first position and the second position. The frame is provided with slits at the first position and the second position. Among them, the operating frequency band of the antenna includes the satellite communication frequency band. In this design solution, the line DM mode of the first radiator can be simultaneously excited through edge feeding, and the radiation efficiency and system efficiency of the resonance generated by the antenna in the line DM mode are relatively high. Since the gain of the antenna is related to the directivity and efficiency of the antenna (radiation efficiency and system efficiency), when the efficiency of the antenna (radiation efficiency and system efficiency) is improved, the directivity remains unchanged, and the gain of the antenna can also be improved.

[0046] The above first solution has many limitations in application. It not only must have a centered ground point, but also requires the feeding position to be close to the ground point. Moreover, another major defect of this method is that it is not applicable to the WIFI frequency band.

[0047] To integrate a circularly polarized antenna in an electronic device, the second solution is to use a power splitter to simultaneously excite two orthogonally placed antenna branches. In this solution, the electronic device includes: a ground plane, a first radiation branch, a second radiation branch, and a first feeding unit. The ground plane includes a first side and a second side. The first radiation branch is adjacent to and parallel to the first side, and the first radiation branch includes a first feeding point and a first ground point. The second radiation branch includes a second feeding point, and the second radiation branch forms an asymmetric dipole antenna with the ground plane. The first feeding unit includes a first feeding output terminal and a second feeding output terminal respectively connected to the first feeding point and the second feeding point, which are respectively used to output a first feeding signal in the satellite communication frequency band to excite the first radiation branch to generate a first current conducting along a direction parallel to the first side, and to output a second feeding signal in the satellite communication frequency band and to excite the asymmetric dipole antenna to generate a second current conducting along a direction parallel to the second side. The phase difference between the first and second feeding signals in the satellite communication frequency band is 90°.

[0048] To solve the above problems, an embodiment of the present application provides an electronic device, including:

[0049] A device body, the middle frame of the device body includes a target metal section, and the target metal section is used as the first antenna; the first antenna includes a first branch and a second branch, and there is a target slit between the first branch and the second branch;

[0050] A second antenna located in the body, the second antenna is locally parallel and opposite to the first antenna, and is locally connected to the first antenna through a feeding point, and the feeding point is connected to the midpoint of the length of the second antenna.

[0051] In the embodiments of the present application, the first antenna includes a first branch and a second branch. There is a target gap between the first branch and the second branch. By designing the lengths of the first branch and the second branch, the first antenna can transmit and receive radio frequency signals in the required frequency band. A second antenna is also provided inside the device body. The second antenna is parallel to a part of the first antenna and is connected to this part through a feed point. The feed point is connected to the midpoint of the length of the second antenna, which can make the electromagnetic signals radiated by the second antenna and the first antenna have different polarization directions. Thus, a non-linear polarization antenna with different polarization directions is constructed by the first antenna and the second antenna. Compared with a linear polarization antenna, the influence of the communication environment can be reduced, and thus the communication performance of the electronic device can be improved.

[0052] Furthermore, by designing the first branch and the second branch to be adapted to the center wavelength of the 5G WIFI frequency band, the electronic device can transmit and receive radio frequency signals in the 5G WIFI frequency band through the first antenna.

[0053] Furthermore, by designing the phase difference between the first antenna and the second antenna, the phase difference in time of the radio frequency signals radiated by the two antennas is equal to or approximately equal to 90°. The electronic device can implement a circular polarization antenna based on the first antenna and the second antenna, which can improve the signal transmission and reception quality. Since the circular polarization antenna has a rotating polarization direction, the phase difference of the reflected signal can be cancelled by rotating the electric field, and it has good anti-multipath interference performance; moreover, the circular polarization antenna is also suitable for communication in a complex electromagnetic environment and has good broadband support performance.

[0054] In the above second solution, a power division unit and a phase shifter need to be provided in the first feed source unit, resulting in a relatively complex feed network structure.

[0055] To make the present application more obvious and understandable, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0056] Refer to Figure 1 , Figure 1 which is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Figure 1 The electronic device shown includes:

[0057] A device body 11, the middle frame 10 of the device body 11 includes a target metal section 12, and the target metal section 12 is used as the first antenna 13; the first antenna 13 includes a first branch 05 and a second branch 07, and there is a target gap 14 between the first branch 05 and the second branch 07;

[0058] The second antenna 04 located within the device body 11 is partially parallel and opposite to a part of the first antenna 13, and this part of the first antenna 13 is connected to the second antenna 04 through a feeding point 03, and the feeding point 03 is connected to the midpoint of the length of the second antenna 04.

[0059] Optionally, the feeding point 03 can be connected to the first stub 05 at one end and the midpoint of the length of the second antenna 04 at the other end through a back-to-back elastic sheet or other connecting components.

[0060] Among them, the second antenna 04 can be a Laser Direct Structuring Antenna (LDS for short). The second antenna 04 includes an insulating bracket and a metal pattern serving as a radiator located on the insulating cloth bracket. The metal pattern can be scanned by a laser beam according to a preset antenna circuit pattern to form a micron-level conductive path on the insulating bracket, and finally form the required antenna radiator.

[0061] It should be noted that the second antenna 04 is not limited to being an LDS antenna, and can also be other types of antennas.

[0062] In the electronic device, the first antenna 13 includes a first stub 05 and a second stub 07. There is a target gap 14 between the first stub 05 and the second stub 07. By designing the lengths of the first stub 05 and the second stub 07, the first antenna 13 can transmit and receive radio frequency signals in the required frequency band.

[0063] In addition, a second antenna 04 is also provided within the device body 11. The second antenna 04 is partially parallel and opposite to a part of the first antenna 13, and the second antenna 04 is connected to this part through a feeding point 03. The feeding point 03 is connected to the midpoint of the length of the second antenna 04, which can make the electromagnetic signals radiated by the second antenna 04 and the first antenna 13 have different polarization directions. Thus, a non-linear polarization antenna with different polarization directions can be constructed by the first antenna 13 and the second antenna 04. Compared with a linear polarization antenna, the influence of the communication environment can be reduced, and thus the communication performance of the electronic device can be improved.

[0064] Optionally, the first antenna 13 can transmit and receive radio frequency signals in the first frequency band, and the center wavelength of the radio frequency signals in the first frequency band is the target wavelength. For the determined radio frequency signals in the first frequency band, its center wavelength is a known constant, so the target wavelength is a known constant. If the first antenna 13 is used to transmit and receive radio frequency signals in the first frequency band, the lengths of the first stub 05 and the second stub 07 are adapted to the target wavelength.

[0065] In an electronic device, the length of the first stub 05 can be set to be not less than one-fourth of the target wavelength and less than three-fourths of the target wavelength. Optionally, the length of the first stub 05 can be one-half of the target wavelength; the length of the second stub 07 is not less than one-half of the target wavelength and less than three-halves of the target wavelength. Optionally, the length of the second stub 07 can be equal to the target wavelength. When the lengths of the first stub 05 and the second stub 07 satisfy the above relationship, a current loop required for the first frequency band antenna operating mode can be formed between the two.

[0066] Based on other embodiments, in one embodiment, by designing the first stub 05 and the second stub 07 to be adapted to the center wavelength of the 5G WIFI frequency band, the electronic device can receive and transmit radio frequency signals in the 5G WIFI frequency band through the first antenna. In this way, the first frequency band is the 5G WIFI frequency band.

[0067] The center wavelength of the 5G WIFI frequency band is a determined constant. If the first frequency band is the 5G WIFI frequency band, the length of the first stub 05 is not less than one-fourth of this center wavelength and less than three-fourths of this center wavelength. For example, the length of the first stub 05 can be one-half of this center wavelength; the length of the second stub 07 is not less than one-half of this center wavelength and less than three-halves of this center wavelength. For example, the length of the second stub 07 can be equal to this center wavelength.

[0068] Based on other embodiments, in one embodiment, by designing the phase difference between the first antenna and the second antenna, the phase difference in time of the radio frequency signals radiated by the two antennas can be made equal to or approximately equal to 90°, so that the electronic device can implement a circularly polarized antenna based on the first antenna and the second antenna, and the signal reception and transmission quality can be improved. Since the circularly polarized antenna has a rotating polarization direction, the phase difference of the reflected signal can be canceled by rotating the electric field, and it has good anti-multipath interference performance; moreover, the circularly polarized antenna is also suitable for communication in complex electromagnetic environments and has good broadband support performance.

[0069] When the phase difference in time of the radio frequency signals radiated by the first antenna 13 and the second antenna 04 is equal to or approximately equal to 90°, since the two are connected to the same feeding point 03, that is, they are connected to the same signal source, the two antennas can be made in parallel, so that the first antenna 13 is used to provide polarization in the first direction, and the second antenna 04 is used to provide polarization in the second direction. The first direction and the second direction are perpendicular, and the radiation effects of the two antennas are superimposed to form a circularly polarized antenna.

[0070] Among them, the phase difference required for the first antenna 13 and the second antenna 04 can be achieved by adjusting the electrical lengths of the first antenna 13 and the second antenna 04.

[0071] Such asFigure 1 As shown, the middle frame 10 has a first slit 15 and a second slit 16; the part of the middle frame 10 between the first slit 15 and the second slit 16 is the target metal segment 12; based on the first slit 15 and the second slit 16, a part of the middle frame 10 can be used as the target metal segment 12 to form the first antenna 13. The part of the middle frame 10 between the first slit 15 and the target slit 14 is the first branch 05; the first branch 05 includes an integrated first sub-metal segment 17 and a second sub-metal segment 18; the first sub-metal segment 17 is adjacent to the target slit 14, and the first sub-metal segment 17 is parallel and opposite to the second antenna 04; the part of the middle frame 10 between the target slit 14 and the second slit 16 is the second branch 07.

[0072] The electronic device further includes a metal ground 19, and the metal ground 19 can be the grounding metal layer of the circuit board (PCB) in the electronic device, that is, the reference ground in the PCB. There is a clearance area 09 between both branches of the first antenna 13 and the metal ground 19. As shown, there is a gap between both the first branch 05 and the second branch 07 and the metal ground 19 to form the clearance area 09.

[0073] Based on other embodiments, in one embodiment, as Figure 1 shown, the second branch 07 has a first ground short point 06 connecting to an adjustment circuit, and the adjustment circuit is used to adjust the impedance and axial ratio. At the first ground short point 06, it is in a 0 ohm state. Figure 1 The adjustment circuit is not shown in the figure. The adjustment circuit can be an RLC circuit, including a resistor R, an inductor L, and a capacitor C. Among them, the adjustment circuit is connected between the first ground short point 06 and GND. In the adjustment circuit, the resistor R, the inductor L, and the capacitor C can be connected in series, or the resistor R, the inductor L, and the capacitor C are connected in parallel with each other. The first ground short point 06 can be connected to the metal ground 19 to achieve grounding.

[0074] Optionally, the distance between the first ground short point 06 and the target slit 14 is less than the distance between the first ground short point 06 and the second slit 16. In this way, the first ground short point 06 is closer to the target slit 14, and the impedance and axial ratio can be better adjusted.

[0075] Based on other embodiments, in one embodiment, as Figure 1 shown, the second branch 07 further includes a second ground short point 08, and the first ground short point 06 is located between the target slit 14 and the second ground short point 08; the distance from the second ground short point 08 to the second slit 16 is not less than one-fourth of the target wavelength. The second ground short point 08 can cooperate with the first ground short point 06 to adjust the electrical size of the second branch 07 and the current path to match the radio frequency signal of the first frequency band, and achieve the current distribution required for receiving and transmitting the radio frequency signal of the first frequency band.

[0076] Optionally, the distance between the second grounding short - circuit point 08 and the second slot 16 is greater than or equal to one - quarter of the target wavelength.

[0077] Based on other embodiments, in one embodiment, as Figure 1 shown, the second sub - metal segment 18 includes at least two sequentially arranged grounding short - circuit points for enabling the first stub 05 to have multiple different current paths. The radio - frequency signal can form a high - frequency alternating - current signal in the first stub 05. Among them, the grounding short - circuit point is connected to the metal ground 19, which can form a return point for the high - frequency alternating - current signal, can change the electrical size of the first stub 05, so that the electrical size and current path of the first stub 05 are adapted to the radio - frequency signal of the first frequency band, and realize the current distribution required for receiving and transmitting the radio - frequency signal of the first frequency band.

[0078] In Figure 1 the shown manner, taking the second sub - metal segment 18 including two grounding short - circuit points as an example for illustration, the two grounding short - circuit points are the third grounding short - circuit point 01 and the fourth grounding short - circuit point 02 respectively.

[0079] The first antenna can also achieve a multi - band resonance design by designing the size and position of each slot in the middle frame 10, and combined with the RLC loading optimization of the above - mentioned adjustment circuit, so that the first stub 05 can not only receive and transmit the radio - frequency signal of the first frequency band, but also receive and transmit the radio - frequency signal of the second frequency band. For example, the radio - frequency signal of the first frequency band can be the 5G WIFI frequency band, and the second frequency band can be the GPS L1 frequency band. The third grounding short - circuit point 01 close to the target slot 14 can provide a return point for the GPS L1 frequency band. The fourth grounding short - circuit point 02 can provide the first return point for the 5G WIFI frequency band. The third grounding short - circuit point 01 can also provide the second return point for the 5G WIFI frequency band to adjust the electrical size of the current path of the 5G WIFI frequency band. Without the third grounding short - circuit point 01, the current path of the 5G WIFI frequency band will be too long, resulting in performance degradation.

[0080] The grounding short - circuit points in the first stub 05 and the second stub 07 are at least used to adjust the adaptation of the internal current path and the current path required for receiving and transmitting the radio - frequency signal of the first frequency band, so that the first stub 05 and the second stub 07 can receive and transmit the radio - frequency signal of the first frequency band with high quality.

[0081] Refer to Figure 2 , Figure 2 which is a partial enlarged view of an electronic device provided by an embodiment of the present application. Based on other embodiments, Figure 2In the manner shown, the length d1 of the second antenna 04 is not less than one quarter of the target wavelength and less than one half of the target wavelength. When the length d1 of the second antenna 04 satisfies the above relationship, its length can be adapted to the radio frequency signal of the first frequency band, so that the second antenna 04 can transmit and receive the radio frequency signal of the first frequency band.

[0082] If the second antenna 04 is an LDS antenna, and the outer periphery of the antenna is coated with a plastic medium with a dielectric constant of about 3.2, taking the first frequency band as the 5G WIFI frequency band (frequency is 5.15Ghz) as an example, the central wavelength is about 32.54mm, one quarter of the central wavelength is 8.14mm, and one half of the central wavelength is 16.27mm. At this time, the length d1 of the second antenna 04 can be greater than or equal to 8.14mm and less than 16.27mm. Therefore, the length d1 of the second antenna 04 can be as small as about 8mm.

[0083] like Figure 2 As shown, the distance between the feed point 03 and the target gap 14 is d2; the distance between the target gap 14 and the first ground short-circuit point 06 is d3; wherein, d2≤d3, based on which the distance from the feed point to the target gap 14 and the distance from the first ground short-circuit point 06 to the target gap 14 can be constrained to effectively control the phase difference of the two orthogonal channels to be equal to or approximately equal to 90°, optimize impedance matching, and combine with the loaded RLC circuit to better meet the circular polarization requirements.

[0084] Optionally, d2≥0.5d1 to better optimize impedance matching and better meet circular polarization requirements.

[0085] Combination Figure 1 and Figure 2 As shown, the middle frame 10 includes a target vertex and a target vertex ( Figure 1 The first side edge (the upper left corner of the middle frame 10) Figure 1 The left side of the middle frame 10 shown) and the second side ( Figure 1 The first side and the second side intersect to form a target vertex angle. The first gap 15 is located on the first side, the second gap 16 is located on the second side, and the target gap 14 is located between the target vertex angle and the second gap 16; wherein the portion between the target vertex angle and the target gap 14 is a first sub-metal segment 17, and the portion between the first gap 15 and the target vertex angle is a second sub-metal segment 18.

[0086] In the electronic device, a part of the first branch 05 (the first sub-metal segment 17) in the first antenna 13 is arranged on the second side, and another part of the first branch 05 (the second sub-metal segment 18) in the first antenna 13 is arranged on the first side, so as to form the following Figure 1The first stub 05 in an inverted L shape can make full use of the corner area of the middle frame 10 without occupying additional internal space of the device, and is suitable for small terminal devices with limited space layout such as smart phones, smart watches, and smart bracelets. In addition, the middle frame 10 has higher mechanical strength at the corner position, reducing the structural vulnerability caused by the opening of gaps. Moreover, setting the second stub 07 of the first antenna 13 on the second side can reduce the space occupied by the first antenna 13 on the length of a single side of the middle frame 10, which is applicable to miniaturized electronic devices.

[0087] Optionally, the length of the first sub-metal segment 17 is adapted to the length of the second antenna 04 and is less than the length of the second sub-metal segment 18. The length of the first sub-metal segment 17 can be set not less than the length of the second antenna 04 so that the length of the first sub-metal segment 17 is adapted to the length of the second antenna 04.

[0088] The first sub-metal segment 17 with a smaller length is arranged on the second side, close to the feeding point 03, which can shorten the current path and adjust the phase of the high-frequency current; the second sub-metal segment 18 with a larger length is arranged on the first side to provide a longer current path, improve the main resonance path, form a multi-band resonance mode in combination with the first sub-metal segment 17, and expand the bandwidth of the first antenna 13. The second sub-metal segment 18 can not only provide a return point through the grounding point, but also reduce the interference of the industrial mode noise through the grounding point. And it can make the phase of the high-frequency current in the first sub-metal segment 17 lead, and combined with the phase delay of the second stub 07 (this phase delay can be set by adjusting the circuit), the circular polarization purity can be enhanced so that the axial ratio does not exceed 3 dB.

[0089] Moreover, since the first antenna 13 connects the first sub-metal segment 17 with a smaller length and the second antenna 04 to the same feeding point 03, and the feeding point 03 is closer to the target gap 14, by adjusting the distance d2, the phase difference between the first antenna 13 and the second antenna 04 can be accurately controlled, and the 90° phase difference required for circular polarization can be better achieved.

[0090] In order to make the electronic device have a more symmetrical appearance, the target gap 14 and the second gap 16 can be symmetrically arranged on the second side. In addition, a third gap 20 is arranged on the third side opposite to the first side, and the third gap 20 and the first gap 15 are symmetric.

[0091] Optionally, in order to achieve higher purity circular polarization, the distance d2 between the feeding point 03 and the target gap 14 can be set to be greater than or equal to one-fourth of the target wavelength and less than or equal to one-half of the target wavelength. For example, the distance d2 can be equal to one-fourth of the target wavelength.

[0092] Optionally, the length of the first stub 05 is less than that of the second stub 07. Through the differential design of the dimensions of the two branches, the differential design of high-frequency optimization for the short branch and low-frequency coverage for the long branch can be achieved, and a multi-band circularly polarized antenna can be implemented on the middle frame 10, which has the advantages of compactness, low cost, and high performance.

[0093] As can be seen from the above description, in the electronic device provided in the embodiment of the present application, the first antenna 13 formed by the middle frame 10 and the second antenna 04 inside the device body 11 can be simultaneously excited through the same feeding point 03, so that the two antennas generate currents with orthogonal phases on the same metal ground 19. By adjusting the lengths of the two antennas to make the currents equal in amplitude, the multi-band circular polarization characteristic can be achieved.

[0094] Next, combined with specific experimental data, the performance of the antenna in the electronic device provided in the embodiment of the present application will be further described.

[0095] Reference Figure 3 and Figure 4 , Figure 3 is a schematic diagram of the current distribution of the antenna in an electronic device provided in the embodiment of the present application at 0° phase. Figure 4 is a schematic diagram of the current distribution of the antenna in an electronic device provided in the embodiment of the present application at 90° phase. As described above, the first antenna 13 and the second antenna 04 are configured as circularly polarized antennas.

[0096] As Figure 3 shown, at 0° phase, the current is 1 target wavelength, and polarization in the first direction Y can be achieved. As Figure 4 shown, at 90° phase, the current is 1 wavelength, and polarization in the second direction X can be achieved. The length direction of the second antenna 04 is the second direction X, and the first direction Y is perpendicular to the second direction X. The plane where the first direction Y and the second direction X are located is parallel to the plane where the middle frame 10 is located.

[0097] Reference Figure 5 , Figure 5 is an axial ratio curve graph of the circularly polarized antenna in an electronic device provided in the embodiment of the present application. The horizontal axis is the frequency / Ghz, and the vertical axis is the axial ratio / dB. The axial ratio AR = 20log (Jy / Jx). Where Jy and Jx are two orthogonal components of the electric field vector. Ideally, the AR of the circularly polarized antenna is 0, but it is difficult to achieve this ideal value in actual products. Therefore, as Figure 5As shown by the thick solid black line in the middle horizontal direction, in an electronic device, when the AR does not exceed 3 dB, it can be regarded as meeting the circular polarization requirement. In a mobile terminal, when the AR does not exceed 3 dB, it can be regarded as meeting the circular polarization requirement. Based on the electronic device provided by the technical solution of the embodiment of the present application, in the 5G WIFI frequency band, such as 5.15 GHz to 5.25 GHz, the value of AR meets the circular polarization requirement.

[0098] Reference Figure 6 , Figure 6 is the gain pattern of the circularly polarized antenna in the XOY plane of an electronic device provided by an embodiment of the present application. The intersection origin O of the first direction Y and the second direction X can be the geometric center of the metal ground 19. Based on Figure 6 the shown gain pattern, it can be seen that RHCP (right-hand circular polarization, the current rotates along the right-hand helix direction) is dominant, with good signal coverage, good omnidirectionality, and few dead angles.

[0099] From the above experimental data, it can be seen that the electronic device provided by the embodiment of the present application can achieve good circular polarization characteristics in the 5G WIFI frequency band, and the antenna structure is simple and easy to implement, with good circular polarization antenna performance, making the electronic device suitable for communication scenarios where the distance from the router is far or there are obstacles in the environment resulting in signal attenuation and polarization adaptation. The electronic device can realize radio frequency signal transceiver in different directions based on the circular polarization characteristics, improving the signal transceiver quality.

[0100] The various embodiments in the description of the present application are described in a progressive, or parallel, or a combination of progressive and parallel manners. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. The embodiments provided by the embodiments of the present application can be combined with each other without contradiction.

[0101] It should be noted that in the description of the present application, it should be understood that the descriptions of the drawings and embodiments are illustrative rather than restrictive. The same reference numerals throughout the embodiments of the specification identify the same structures. Additionally, for the sake of understanding and easy description, the drawings may exaggerate the thickness of some layers, films, panels, regions, etc. At the same time, it can be understood that when an element such as a layer, film, region, or substrate is referred to as "on" another element, the element can be directly on the other element or there can be intermediate elements. Additionally, "on..." means positioning the element on or below another element, but essentially does not mean positioning on the upper side of another element according to the direction of gravity.

[0102] The orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be intervening components present simultaneously.

[0103] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that an article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the article or device comprising the above elements.

[0104] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An electronic device, comprising: A device body, the middle frame of the device body includes a target metal section, and the target metal section is used as a first antenna; The first antenna includes a first branch and a second branch, and there is a target gap between the first branch and the second branch; A second antenna located inside the device body, the second antenna is parallel to a part of the first antenna and is connected to the part of the first antenna through a feeding point, and the feeding point is connected to the midpoint of the length of the second antenna.

2. The electronic device according to claim 1, wherein the middle frame has a first gap and a second gap; The part of the middle frame between the first gap and the second gap is the target metal section; The part of the middle frame between the first gap and the target gap is the first branch; the first branch includes an integrated first sub-metal section and a second sub-metal section; the first sub-metal section is adjacent to the target gap and is parallel to the second antenna; The part of the middle frame between the target gap and the second gap is the second branch.

3. The electronic device according to claim 2, wherein the second sub-metal section includes at least two sequentially arranged grounding short-circuit points for enabling the first branch to have multiple different current paths.

4. The electronic device according to claim 2, wherein the first antenna can receive and transmit radio frequency signals in a first frequency band; the center wavelength of the radio frequency signals in the first frequency band is a target wavelength; The length of the second antenna is not less than one-fourth of the target wavelength and less than one-half of the target wavelength.

5. The electronic device according to claim 2, wherein the second branch has a first grounding short-circuit point connected to an adjustment circuit, and the adjustment circuit is used to adjust the impedance and axial ratio; The distance between the first grounding short-circuit point and the target gap is less than the distance between the first grounding short-circuit point and the second gap.

6. The electronic device according to claim 5, wherein the distance between the feeding point and the target gap is d2; The distance between the target gap and the first grounding short-circuit point is d3; Among them, d2 ≤ d3.

7. The electronic device according to claim 2, wherein the first antenna can receive and transmit radio frequency signals in a first frequency band; the center wavelength of the radio frequency signals in the first frequency band is a target wavelength; The second branch further includes a second grounding short-circuit point, and the first grounding short-circuit point is located between the target gap and the second grounding short-circuit point; The distance from the second grounding short-circuit point to the second gap is not less than one-fourth of the target wavelength.

8. The electronic device according to claim 2, wherein the middle frame includes a target vertex angle and a first side and a second side forming the target vertex angle, the first gap is located on the first side, the second gap is located on the second side, and the target gap is located between the target vertex angle and the second gap; Among them, The part between the target vertex angle and the target gap is the first sub-metal section, and the part between the first gap and the target vertex angle is the second sub-metal section.

9. The electronic device according to claim 8, wherein the first sub-metal segment is adapted to the length of the second antenna and is less than the length of the second sub-metal segment.

10. The electronic device according to claim 1, wherein the first antenna is capable of receiving and transmitting radio frequency signals in a first frequency band; the center wavelength of the radio frequency signals in the first frequency band is a target wavelength; the distance between the feeding point and the target slot is greater than or equal to one-fourth of the target wavelength and less than or equal to one-half of the target wavelength; or, the length of the first branch is less than the length of the second branch; or, the length of the first branch is not less than one-fourth of the target wavelength and less than three-fourths of the target wavelength; or, the length of the second branch is not less than one-half of the target wavelength and less than three-halves of the target wavelength.

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