Electronic device

Abstract

The present application relates to the technical field of electronic products, and discloses an electronic device. The electronic device comprises an antenna radiator, a feed circuit and a conductive plate; the conductive plate is grounded; the antenna radiator comprises a first radiation branch and a second radiation branch which are arranged at an included angle; the conductive plate comprises a first side and a second side which are adjacent to each other; the antenna radiator and the conductive plate are spaced apart from each other; and the first radiation branch is opposite to the first side, and the second radiation branch is opposite to the second side. The feed circuit is electrically connected to the antenna radiator, and the antenna radiator is electrically connected to the conductive plate. When the antenna radiator is in a working state, the antenna radiator excites resonant modes of the first side and the second side of the conductive plate.

Description

Electronic device

[0001] Cross Reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202411299656.8, filed on September 18, 2024, the contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of electronic products, in particular to an electronic device. BACKGROUND

[0004] The amount of electromagnetic wave absorbed by the human body is mainly measured by the specific absorption ratio (SAR). The smaller the SAR value, the smaller the influence of electromagnetic wave radiation on the human body. Since electromagnetic wave radiation can have adverse effects on the human body, people have begun to pay attention to the influence of electromagnetic wave radiation on the human body. On the other hand, with the increasing demand for electronic devices, new requirements have also been put forward for the appearance form of electronic devices. In recent years, with the increasing maturity of the intelligent development of electronic devices, it has become an inevitable trend to pursue the thinness and extreme screen ratio of electronic devices. However, this design greatly compresses the space for antenna arrangement, resulting in a poor antenna environment. With the development of technology, the new national standard for SAR is becoming more and more strict in terms of the SAR performance standard of electronic devices, which also poses a great challenge to antenna design. Therefore, how to realize a high-performance low-SAR antenna scheme on an electronic device is an important problem worthy of study.

[0005] Under the current situation of increasingly strict SAR standards, the SAR performance benefits of existing low-SAR antenna design technologies are gradually difficult to meet the increasing communication needs of electronic devices. SUMMARY

[0006] The present application provides an electronic device, which is beneficial to reduce the SAR peak value of the electronic device.

[0007] In a first aspect, the present application provides an electronic device, comprising an antenna radiator, a feed circuit and a conductive plate, the conductive plate being grounded, the antenna radiator comprising a first radiation branch and a second radiation branch arranged at an included angle, the conductive plate comprising adjacent first and second edges, the antenna radiator being arranged spaced apart from the conductive plate, the first radiation branch being opposite the first edge, and the second radiation branch being opposite the second edge.

[0008] The feed circuit is electrically connected to the antenna radiator, and the antenna radiator is electrically connected to the conductive plate.

[0009] The antenna radiator excites a resonant mode of the first edge and the second edge of the conductive plate when the antenna radiator is in an active state.

[0010] In the embodiment of the present application, since the top corner of the conductive plate is an electric field intensity point of the conductive plate in the transverse half-wave mode and the longitudinal full-wave mode, in the embodiment of the present application, the antenna radiator is arranged at the top corner where the first edge and the second edge of the conductive plate are connected, thus, the resonant mode of the first edge and the second edge of the conductive plate is excited, since the first edge and the second edge can both resonate, the near-field energy can be uniformly distributed on the conductive plate, and a more dispersed hot spot distribution is constructed, which is beneficial to reducing the SAR peak value of the electronic device. BRIEF DESCRIPTION OF DRAWINGS

[0011] FIG. 1 is a structural schematic diagram of a conductive plate in the embodiment of the present application;

[0012] FIG. 2 is one of simulation schematic diagrams obtained by performing finite element simulation on the conductive plate;

[0013] FIG. 3 is one of simulation schematic diagrams obtained by simulating the metal frame antenna in the embodiment of the present application;

[0014] FIG. 4 is another of simulation schematic diagrams obtained by simulating the metal frame antenna in the embodiment of the present application;

[0015] FIG. 5 is a third of simulation schematic diagrams obtained by simulating the metal frame antenna in the embodiment of the present application;

[0016] FIG. 6 is a fourth of simulation schematic diagrams obtained by simulating the metal frame antenna in the embodiment of the present application;

[0017] FIG. 7 is one of schematic diagrams of the metal frame antenna connected with the conductive plate in the embodiment of the present application;

[0018] FIG. 8 is a fifth of simulation schematic diagrams obtained by simulating the metal frame antenna in the embodiment of the present application;

[0019] FIG. 9 is one of radiation efficiency schematic diagrams obtained by simulating the metal frame antenna in the embodiment of the present application;

[0020] FIG. 10 is a sixth of simulation schematic diagrams obtained by simulating the metal frame antenna in the embodiment of the present application;

[0021] FIG. 11 is a second of schematic diagrams of the metal frame antenna connected with the conductive plate in the embodiment of the present application;

[0022] FIG. 12 is a third of schematic diagrams of the metal frame antenna connected with the conductive plate in the embodiment of the present application;

[0023] FIG. 13 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0024] FIG. 14 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0025] FIG. 15 is a schematic diagram of radiation efficiency obtained by simulation of the metal frame antenna in the embodiment of the present application;

[0026] FIG. 16 is a schematic diagram of simulation obtained by simulation of the metal frame antenna in the embodiment of the present application;

[0027] FIG. 17 is a schematic diagram of simulation obtained by simulation of the metal frame antenna in the embodiment of the present application;

[0028] FIG. 18 is a schematic diagram of simulation obtained by simulation of the metal frame antenna in the embodiment of the present application;

[0029] FIG. 19 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0030] FIG. 20 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0031] FIG. 21 is a schematic diagram of simulation obtained by simulation of the metal frame antenna in the embodiment of the present application;

[0032] FIG. 22 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0033] FIG. 23 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0034] FIG. 24 is a schematic diagram of simulation obtained by simulation of the metal frame antenna in the embodiment of the present application;

[0035] FIG. 25 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0036] FIG. 26 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0037] FIG. 27 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0038] FIG. 28 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0039] FIG. 29 is a schematic diagram of connection between the metal frame antenna and the conductive plate in the embodiment of the present application;

[0040] FIG. 30 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a twenty-fifth embodiment of the present application;

[0041] FIG. 31 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a twenty-sixth embodiment of the present application;

[0042] FIG. 32 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a twenty-seventh embodiment of the present application;

[0043] FIG. 33 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a twenty-eighth embodiment of the present application;

[0044] FIG. 34 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a twenty-ninth embodiment of the present application;

[0045] FIG. 35 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirtieth embodiment of the present application;

[0046] FIG. 36 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-first embodiment of the present application;

[0047] FIG. 37 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-second embodiment of the present application;

[0048] FIG. 38 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-third embodiment of the present application;

[0049] FIG. 39 is a schematic diagram of the antenna mode current distribution obtained by simulating the metal frame antenna according to an embodiment of the present application;

[0050] FIG. 40 is a schematic diagram of the radiation efficiency obtained by simulating the metal frame antenna according to an embodiment of the present application;

[0051] FIG. 41 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-fourth embodiment of the present application;

[0052] FIG. 42 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-fifth embodiment of the present application;

[0053] FIG. 43 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-sixth embodiment of the present application;

[0054] FIG. 44 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-seventh embodiment of the present application;

[0055] FIG. 45 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-eighth embodiment of the present application;

[0056] FIG. 46 is a schematic diagram of the connection between the metal frame antenna and the conductive plate according to a thirty-ninth embodiment of the present application;

[0057] FIG. 47 is a schematic diagram of the connection between the metal frame antenna and the conductive plate in the thirtieth embodiment of the present application;

[0058] FIG. 48 is a schematic diagram of the connection between the metal frame antenna and the conductive plate in the thirty-first embodiment of the present application;

[0059] FIG. 49 is a schematic diagram of the antenna mode current distribution obtained by simulating the metal frame antenna in the embodiment of the present application;

[0060] FIG. 50 is a schematic diagram of the radiation efficiency obtained by simulating the metal frame antenna in the embodiment of the present application;

[0061] FIG. 51 is a schematic diagram of the connection between the metal frame antenna and the conductive plate in the thirty-second embodiment of the present application. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0063] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second", and the like are generally of a kind and are not limited in number, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the objects before and after are in an "or" relationship.

[0064] The electronic device provided by the embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments and application scenarios.

[0065] The size of the SAR peak is closely related to the conducted power of the radio frequency front end and the radiation efficiency (actual radiated electromagnetic energy) of the antenna itself. In order to effectively compare the SAR performance, the conducted power of the radio frequency front end and the radiation efficiency of the antenna itself are normalized to the same level in the embodiments of the present application, and the SAR peak is compared on this basis. The concept of normalized SAR is introduced. The normalized standard in the industry is generally defined as a radio frequency conducted power of 24 dBm and an antenna efficiency of -5 dB.

[0066] Figure 1 shows a general size example of an electronic device, the conductive back cover is about 160mm x 72mm. Figure 2 shows the first three characteristic modes of the conductive back cover, Figure 2(a) is a longitudinal half-wave mode with a high low-frequency proportion, Figure 2(b) is a longitudinal full-wave mode with a high medium-frequency proportion, and Figure 2(c) is a transverse half-wave mode with a high high-frequency proportion. When the middle frame antenna is working, if it can effectively excite the resonant mode of the conductive back cover, the current distribution on the antenna body and the conductive back cover will be more uniform, and the magnetic field distribution of the near field will be more uniform, and a more dispersed hot spot distribution will be formed. Figure 3 shows the 5mm-body SAR hot spot distribution of the IFA antenna working at medium frequency at different positions on the side of the conductive back cover. It can be seen that when the lower ground point of the IFA antenna is located at the electric field strong point (yellow circle) of the longitudinal full-wave mode of the conductive back cover, it is easier to excite the characteristic mode of the conductive back cover at medium frequency, and the corresponding 5mm-body SAR hot spot is more dispersed, as shown in Figures 3(a) and 3(c). When the lower ground point of the IFA antenna is located at the magnetic field strong point (red circle) of the medium-frequency characteristic mode of the conductive back cover, the corresponding 5mm-body SAR hot spot is more concentrated, as shown in Figure 3(b). Figure 4 shows the 5mm-body SAR hot spot distribution of the traditional medium-frequency IFA antenna at different positions on the top edge. The excitation rule of the conductive back cover mode is consistent with the case when it is on the side, that is, when the lower ground position 330 of the IFA antenna is at the electric field strong point of the transverse half-wave mode of the conductive back cover, the characteristic mode of the conductive back cover can be effectively excited. Figure 5 further shows the excitation of the conductive back cover top and side characteristic modes by the hanging angle IFA antenna. It can be seen that the hanging angle IFA antenna on the top and side obviously excites the transverse half-wave mode and the longitudinal full-wave mode of the conductive back cover. Similarly, for the IFA antenna working at low frequency, the excitation mechanism of the conductive back cover mode is similar, as shown in Figure 6.

[0067] Therefore, the excitation of the conductive back cover mode needs to follow the following principles:

[0068] (1) The antenna body structure has at least one short-circuit path with the conductive back cover (i.e. the lower ground point, which is also the current strong point), and the lower ground current point needs to be placed at the electric field strong point (yellow circle in Figure 2) of the conductive back cover mode.

[0069] (2) The orientation of the antenna determines the coupling edge between the antenna branch and the conductive back cover.

[0070] (3) For medium-high frequency antennas, the conductive back cover has two characteristic modes at medium-high frequency, i.e. the longitudinal full-wave mode and the transverse half-wave mode, so the current strong point of the antenna can be placed at the middle and both ends of the side, or at both ends of the top edge;

[0071] (4) For low-frequency antennas, the characteristic mode of the conductive back cover at low frequency is the longitudinal half-wave mode, so the current strong point of the antenna can be placed at both ends of the side.

[0072] As shown in FIG. 7, an electronic device provided by an embodiment of the present application includes an antenna radiator 100, a feed circuit 200, and a conductive plate 300, the conductive plate 300 is grounded, the antenna radiator 100 includes a first radiating branch 110 and a second radiating branch 120 arranged at an included angle, the conductive plate 300 includes a first side 310 and a second side 320 adjacent to each other, the antenna radiator 100 is arranged spaced apart from the conductive plate 300, the first radiating branch 110 is opposite to the first side 310, and the second radiating branch 120 is opposite to the second side 320.

[0073] The feed circuit 200 is electrically connected to the antenna radiator 100, and the antenna radiator 100 is electrically connected to the conductive plate 300.

[0074] In a case where the antenna radiator 100 is in a working state, the antenna radiator 100 excites a resonant mode of the first side 310 and the second side 320 of the conductive plate 300.

[0075] The antenna radiator 100 can be a radiator of various antennas, for example, can be a radiator of a metal frame antenna of an electronic device, and in addition, as shown in FIG. 51, the antenna radiator 100 can also be a radiator of a flexible printed circuit (FPC) antenna located at the back of the conductive plate 300. Correspondingly, the feed circuit 200 can be a feed circuit 200 of various antennas, and the feed circuit 200 can transmit and receive antenna signals through the antenna radiator 100.

[0076] In some embodiments of the present application, the above-mentioned conductive plate 300 can be a metal back cover of the electronic device. In addition, since the electronic device usually also includes a floor as the main ground, the floor is a metal plate located below the screen in the electronic device. The arrangement direction of the shape of the floor and the metal back cover are similar, and the positional relationship between the floor and the metal frame antenna is similar to the positional relationship between the metal back cover and the metal frame antenna, and at the same time, the floor and the metal back cover both need to be grounded, therefore, the floor and the metal back cover have similar characteristic modes, that is, the first three characteristic modes of the floor are similar to the above-mentioned first three characteristic modes of the metal back cover. Based on this, in some embodiments of the present application, the conductive plate 300 can also be a floor in the electronic device. Hereinafter, the conductive plate 300 is taken as an example of a metal back cover of the electronic device to further explain the electronic device provided by an embodiment of the present application.

[0077] The above-mentioned resonant mode can include a transverse half-wave resonant mode and a longitudinal full-wave resonant mode, wherein the transverse direction is the width direction of the electronic device, and the longitudinal direction is the length direction of the electronic device.

[0078] In some embodiments of the present application, the conductive plate 300 can be in a rectangular plate shape, one of the first edge 310 and the second edge 320 is the length direction edge of the conductive plate 300, and the other is the width direction edge of the conductive plate 300. For ease of understanding, the electronic device provided by the embodiments of the present application is further explained below by taking the first edge 310 as the width direction edge of the conductive plate 300 and the second edge 320 as the length direction edge of the conductive plate 300 as an example.

[0079] In this embodiment, since the top corner of the conductive plate 300 is the electric field intensity point of the conductive plate 300 in the transverse half-wave mode and the longitudinal full-wave mode, in the embodiments of the present application, the antenna radiator 100 is arranged at the top corner where the first edge 310 and the second edge 320 of the conductive plate 300 are connected, so as to stimulate the resonance mode of the first edge 310 and the second edge 320 of the conductive plate 300. Since the first edge 310 and the second edge 320 can both resonate, the near-field energy can be uniformly distributed in the conductive plate 300, thereby making the magnetic field distribution of the near field more uniform and constructing a more dispersed hot spot distribution, which is beneficial to reducing the SAR peak value of the electronic device.

[0080] Optionally, the antenna radiator 100 comprises a grounding point 130, the grounding point 130 is located at the middle of the length direction of the antenna radiator 100, and the grounding point 130 is electrically connected with the conductive plate 300.

[0081] Specifically, as shown in FIG. 7, when the lengths of the first radiation branch 110 and the second radiation branch 120 are equal, the grounding point 130 can be located at the corner of the antenna radiator 100, at this time, the grounding point 130 can be connected with the first top corner 340 of the conductive plate 300 and the antenna radiator 100, the first top corner 340 is the top corner at the connection of the first edge 310 and the second edge 320.

[0082] Correspondingly, when the lengths of the first radiation branch 110 and the second radiation branch 120 are not equal, as shown in FIG. 22 and FIG. 23, the position of the grounding point 130 should satisfy the following constraint condition, so that the grounding point 130 is located at the middle of the length direction of the antenna radiator 100:

[0083] Wherein, L1+D / 2 is the length of the radiation branch between the end of the first radiation branch 110 away from the second radiation branch 120 and the grounding point 130, and L2-D / 2 is the length of the radiation branch between the end of the second radiation branch 120 away from the first radiation branch 110 and the grounding point 130. Wherein, the values of L1 and L2 can be equal, and the value of D is relatively small, so L1+D / 2≈L2-D / 2.

[0084] Please further refer to FIG. 22, when the grounding point 130 deviates from the first top corner 340 to the left, i.e. the grounding point 130 deviates to the side of the first edge 310, the excitation degree of the radiation branch opposite to the first edge 310 will decrease, and by locating the grounding point 130 in the middle of the length direction of the antenna radiator 100, it is beneficial to increase the length of the radiation branch opposite to the first edge 310 to increase the excitation degree of the radiation branch opposite to the first edge 310. Correspondingly, as shown in FIG. 23, when the grounding point 130 deviates from the first top corner 340 downward, i.e. the grounding point 130 deviates to the side of the second edge 320, the excitation degree of the radiation branch opposite to the second edge 320 will decrease, and by locating the grounding point 130 in the middle of the length direction of the antenna radiator 100, it is beneficial to increase the length of the radiation branch opposite to the second edge 320 to increase the excitation degree of the radiation branch opposite to the second edge 320. In this way, the excitation degrees of the horizontal half-wave mode of the top edge of the conductive plate 300 and the vertical full-wave mode of the side edge of the conductive plate 300 can be kept close.

[0085] In this embodiment, by locating the grounding point 130 in the middle of the length direction of the antenna radiator 100 and electrically connecting the grounding point 130 with the conductive plate 300, the excitation degrees of the horizontal half-wave mode of the top edge of the conductive plate 300 and the vertical full-wave mode of the side edge of the conductive plate 300 can be kept close.

[0086] Optionally, the conductive plate 300 comprises a grounding position 330, the grounding point 130 is electrically connected with the grounding position 330, and the grounding position 330 is located at the first top corner 340 of the conductive plate 300, the first top corner 340 being the top corner of the junction of the first edge 310 and the second edge 320.

[0087] It can be understood that the first top corner 340 is the top corner opposite to the antenna radiator 100 of the conductive plate 300.

[0088] In this embodiment, since the first top corner 340 of the conductive plate 300 is the point of strong electric field in the horizontal half-wave mode and the vertical full-wave mode, by locating the grounding position 330 at the first top corner 340 of the conductive plate 300, it is beneficial to excite the horizontal half-wave resonance mode and the vertical full-wave resonance mode of the conductive plate 300 in the case that the antenna radiator 100 is in the working state, so that the current can be distributed more uniformly in the antenna body and the conductive plate 300, and it is beneficial to reduce the SAR peak value of the electronic device.

[0089] Optionally, referring to FIG. 7, the feeding circuit 200 comprises a first feeding source 210 and a second feeding source 220, the first feeding source 210 is electrically connected with the first radiating branch 110, and the second feeding source 220 is electrically connected with the second radiating branch 120; or,

[0090] Referring to FIG. 11, the feeding circuit 200 comprises a first feeding source 210 and a power divider 230, the first feeding source 210 is electrically connected with the power divider 230, and the power divider 230 is electrically connected with the first radiating branch 110 and the second radiating branch 120 respectively; or,

[0091] Referring to FIG. 12, the feeding circuit 200 comprises a first feeding source 210, a power divider 230 and a matching circuit 240, the first feeding source 210 is electrically connected with the power divider 230 through the matching circuit 240, and the power divider 230 is electrically connected with the first radiating branch 110 and the second radiating branch 120 respectively; or,

[0092] Referring to FIG. 13, the feeding circuit 200 comprises a first feeding source 210, the first feeding source 210 is electrically connected with the first radiating branch 110; or,

[0093] Referring to FIG. 14, the feeding circuit 200 comprises a second feeding source 220, the second feeding source 220 is electrically connected with the second radiating branch 120; or,

[0094] Referring to FIG. 19, the feeding circuit 200 comprises a first feeding source 210, the first feeding source 210 is electrically connected with the first radiating branch 110, and the second radiating branch 120 is grounded through a second tuning circuit 400; or,

[0095] Referring to FIG. 20, the feeding circuit 200 comprises a second feeding source 220, the second feeding source 220 is electrically connected with the second radiating branch 120, and the first radiating branch 110 is grounded through a first tuning circuit 500.

[0096] It can be understood that the first feeding source 210 and the second feeding source 220 can output the same feeding signal, specifically, the first feeding source 210 and the second feeding source 220 can excite the source signal with the same phase, that is, the phase of the feeding signal output by the first feeding source 210 and the second feeding source 220 is the same.

[0097] Specifically, the conductive plate 300 has two characteristic modes with high component ratios in the mid-high frequency band: (1) a longitudinal full-wave mode of the side edge; and (2) a transverse half-wave mode of the top edge. For a mid-high frequency antenna, an effective and feasible low-SAR antenna solution is to simultaneously excite the two conductive plate 300 modes, so that the near-field energy is equally distributed on the top surface, side surface and back surface, and the SAR peak value is greatly reduced. That is, the SAR hotspot peak values of the antenna on the side surface, top surface and back surface (front surface) are similar. To further illustrate the feasibility of this principle, the following examples are given.

[0098] FIG. 7 shows an example of a low-SAR dual-fed T antenna operating in a mid-frequency band, in which the lengths of the first radiating branch 110 and the second radiating branch 120 are L1 and L2, respectively. Between the antenna radiator 100 and the conductive plate 300, a medium with a dielectric constant of ε r = 3.6 is filled. FIG. 4(b) is a comparison with a conventional IFA antenna solution. The conductive plate 300 of the electronic device is a rectangular conductive plate 300 with a size of 160 mm x 72 mm. At the corners of the conductive plate 300, one IFA antenna of the same size is arranged towards the top edge and towards the side edge, i.e., L1 = L2. The lower points of the two IFA antennas are arranged at the corner points and coincide, i.e., a dual-fed T antenna is formed. When the two feed sources are excited with in-phase signals, the current distribution of the antenna resonance shows a common mode, as shown in FIG. 8, and there is no efficiency dip in the mid-high frequency band (1.7 GHz-2.7 GHz), showing a high radiation efficiency, as shown in FIG. 9. Since the lower points of the dual-fed T antenna are at the corners, and there are equal-length branches towards the top edge and the side edge, when it operates in the common mode, the transverse half-wave mode and the longitudinal full-wave mode of the conductive plate 300 can be simultaneously excited, so that the near-field energy is uniformly distributed on the top, side and back surfaces, thereby reducing the SAR peak value of the antenna. FIG. 10(a) and FIG. 10(c) show the current distribution of the antenna and the conductive plate 300 when the IFA antenna solution and the dual-fed T antenna solution are working. It can be seen that the dual-fed T antenna solution equally excites the transverse half-wave mode of the top edge and the longitudinal full-wave mode of the side edge of the conductive plate 300, while the conventional IFA antenna solution mainly excites the transverse half-wave mode of the top edge. FIG. 10(b) and FIG. 10(d) show the 5 mm body SAR hotspot maps of the back surface of the dual-fed T antenna solution compared with the conventional IFA solution. The dual-fed T antenna solution has more near-field energy distribution on the right side edge than the conventional IFA solution.

[0099] Table 1 lists the normalized SAR of the top, right side and back of the dual-fed T antenna scheme compared with the conventional IFA scheme. It can be seen that the SAR hot spot peak of the conventional IFA antenna is close to the top and back, and is obviously higher than the right side. The dual-fed T antenna scheme improves the SAR peak of the right side and reduces the SAR peak of the top and back, achieving a result that the SAR hot spot peaks of the top, side and back are close to each other. Taking the maximum normalized SAR peak of the dual-fed T antenna scheme and the conventional IFA antenna scheme for comparison, the SAR gain of the new T antenna scheme is greater than 1 dB.

[0100] Table 1: The normalized SAR of the top, right side and back of the dual-fed T antenna scheme provided by the embodiments of the present application compared with the conventional IFA scheme

[0101] As shown in FIG. 7, in some embodiments of the present application, the feeding circuit 200 includes a first feed source 210 and a second feed source 220, the first feed source 210 is electrically connected with the first radiating branch 110, and the second feed source 220 is electrically connected with the second radiating branch 120. Specifically, the above-mentioned antenna radiator 100 is the radiator of a dual-fed T antenna, the ground point of the antenna is outside the corner of the conductive plate 300 (the right upper corner of the conductive plate 300 is taken as an example in the figure, that is, the first top corner 340 is the top corner of the right upper corner of the conductive plate 300), and the dielectric constant of the medium filled between the antenna radiator 100 and the conductive plate 300 is ε r . The size of the two branches of the T antenna is L1=L2≈l (l is a constant and λ g is the corresponding wavelength when the antenna resonates, that is, the working wavelength of the antenna). The two feeding points of the antenna are located on the two sides of the lower point, as shown in FIG. 7. At this time, the two feeding points are respectively fed with in-phase excitation sources, and the antenna works in the common mode when resonating, which can effectively excite the horizontal half-wave mode of the top edge of the conductive plate 300 and the vertical full-wave mode of the right side edge, so that the near-field energy distribution of the antenna is more dispersed, and the SAR peak value is lower.

[0102] As shown in FIG. 11, in some other embodiments of the present application, the feeding circuit 200 includes a first feed source 210 and a power divider 230, the first feed source 210 is electrically connected with the power divider 230, and the power divider 230 is electrically connected with the first radiating branch 110 and the second radiating branch 120 respectively. In this embodiment, the feeding circuit 200 is designed to divide the excitation source signal into two equal-amplitude in-phase branch signals through a power divider 230 and connect them to the first radiating branch 110 and the second radiating branch 120, so that one signal source can be reduced while the antenna still works in the common mode.

[0103] As shown in FIG. 12, in some other embodiments of the present application, the feeding circuit 200 comprises a first feeding source 210, a power divider 230 and a matching circuit 240, the first feeding source 210 is electrically connected with the power divider 230 through the matching circuit 240, and the power divider 230 is electrically connected with the first radiation branch 110 and the second radiation branch 120 respectively. In this embodiment, the resonant frequency of the antenna can cover a wider frequency band. On the basis of FIG. 11, a matching circuit 240 is further added in front of the power divider 230 for impedance tuning.

[0104] The embodiments shown in FIGS. 7, 11 and 12 have at least the following beneficial effects:

[0105] (1) The antenna has no efficiency pits in a wider frequency band (such as a medium-high frequency band), and thus has a higher radiation efficiency, as shown in FIG. 9;

[0106] (2) Since the antenna is in a common mode in a wider frequency band, the antenna can achieve a significant low SAR characteristic in the wider frequency band;

[0107] (3) Compared with the conventional IFA scheme, the normalized SAR performance gain of the antenna scheme is greater than 1 dB.

[0108] Since the double-fed T antenna with the ground at the hanging angle works in the common mode, the horizontal half-wave mode of the top edge of the conductive plate 300 and the vertical full-wave mode of the side edge can be effectively excited, the near-field magnetic field distribution is more uniform, and thus the SAR peak of the antenna is reduced. Based on the above idea, FIGS. 13 and 14 show a single-fed T antenna structure with stronger practicability, wherein the antenna is located at the corner below, and equal-length branches are distributed on both sides, i.e., L1=L2. Between the antenna radiator 100 and the conductive plate 300, a dielectric constant of ε rThe feeding point can be located at the side edge as shown in FIG. 14 or at the top edge as shown in FIG. 13. For the convenience of explaining the performance of the scheme, the following takes FIG. 14 as an example. FIG. 15 is the radiation efficiency of the single-fed T antenna. It can be seen that the antenna performs as a convex envelope at the medium frequency and as a concave pit at the high frequency. FIG. 16 is the current distribution of the resonant mode of the single-fed T antenna. It can be seen that the antenna performs as a common mode at the medium frequency and as a differential mode at the high frequency. In combination with FIG. 15 and FIG. 16, it can be seen that the radiation efficiency is higher when the antenna works in the common mode. As shown in FIG. 17, the common mode of the single-fed T antenna can effectively excite the characteristic modes of the top edge and the side edge of the conductive plate 300 at the same time, dispersing the energy distribution of the antenna in the near field. FIG. 18 shows the back 5mm body SAR hot spot comparison of the single-fed T antenna at the hanging angle position and the traditional IFA antenna at the hanging angle position, indicating that the near-field energy of the single-fed T antenna is more uniformly distributed at the top edge and the side edge, and the SAR hot spot distribution is also more dispersed. In order to further quantify the SAR performance benefits of the single-fed T antenna compared with the traditional IFA scheme, Table 2 lists the 5mm-body SAR comparison of the single-fed T antenna and the traditional IFA antenna. It can be seen that compared with the traditional IFA antenna, the low-SAR single-fed T antenna has a significantly increased SAR peak value on the right side, indicating that the energy distribution ratio on the right side increases, and according to the law of conservation of energy, the SAR peak values on the top and back sides are significantly smaller. The normalized SAR benefit of the low-SAR single-fed T antenna is about 1.0 dB.

[0109] Table 2: Normalized SAR of the single-fed T antenna scheme provided in the embodiments of the present application compared with the traditional IFA scheme on the top, right side and back of the electronic device

[0110] As shown in FIG. 13 and FIG. 14, in some embodiments of the present application, the antenna structure to which the above-mentioned antenna radiator 100 belongs is a single-fed T antenna, the return point of the antenna is located outside the corner of the conductive plate 300 (the right upper corner of the conductive plate 300 is taken as an example in the figure), and the dielectric constant of the medium filled between the antenna and the conductive plate 300 is ε r , the size of the two branches of the T antenna is L1=L2≈l (l is a constant and λg is the wavelength corresponding to the resonance of the antenna, i.e. the operating wavelength of the antenna). The antenna feed point can be located at the top edge of the conductive plate 300, for example, as shown in FIG. 13, the feed circuit 200 includes a first feed source 210, which is electrically connected to the first radiating branch 110. In addition, the antenna feed point can also be located at the side edge, for example, as shown in FIG. 14, the feed circuit 200 includes a second feed source 220, which is electrically connected to the second radiating branch 120. At this time, the antenna has two resonance modes, as shown in FIG. 15, the lower frequency resonance mode is the common mode, and the higher frequency resonance mode is the differential mode. When the antenna operates in the common mode, the transverse half-wave mode at the top edge of the conductive plate 300 and the longitudinal full-wave mode at the right side edge can be effectively excited, so that the near-field energy distribution of the antenna is more dispersed, and the SAR peak value is lower. In addition, by adding a tuning circuit on the side of the non-feed branch, the antenna can be tuned to further cover more frequency bands while maintaining the common mode, for example, as shown in FIG. 19, the feed circuit 200 includes a first feed source 210, which is electrically connected to the first radiating branch 110, and the second radiating branch 120 is grounded through a second tuning circuit 400. For another example, as shown in FIG. 20, the feed circuit 200 includes a second feed source 220, which is electrically connected to the second radiating branch 120, and the first radiating branch 110 is grounded through a first tuning circuit 500.

[0111] The embodiments shown in FIGS. 13, 14, 19 and 20 have the following beneficial effects compared with the embodiments shown in FIGS. 7, 11 and 12:

[0112] (1) The single-feed point design is more practical;

[0113] (2) The antenna can obtain high radiation efficiency and low SAR peak value performance in a wider frequency band;

[0114] (3) Compared with the traditional IFA scheme, the normalized SAR performance gain of this antenna scheme is about 1 dB, as shown in Table 2.

[0115] Optionally, the conductive plate 300 includes a ground position 330, the grounding point 130 is electrically connected to the ground position 330, and the distance between the ground position 330 and the first top corner 340 of the conductive plate 300 is a first distance D, the first top corner 340 is the top corner of the connection between the first edge 310 and the second edge 320, and the value range of D is:

[0116] wherein L1 is the length of the first radiating branch 110, L2 is the length of the second radiating branch 120, s is the width of the antenna radiator 100, and g is the distance between the antenna radiator 100 and the conductive plate 300.

[0117] In the embodiments of the present application, the offset distance of the ground point to the edge of the side (or top) of the conductive plate 300 is D, the feed point can be located on the side or the top, the lengths of the first radiating branch 110 and the second radiating branch 120 are L1 and L2 respectively. In addition, S is the width of the antenna arm, and g is the distance from the lower edge of the antenna arm to the conductive plate 300 of the electronic device.

[0118] a) when D = 0

[0119] When D = 0, the ground position 330 of the antenna is located at the corner of the conductive plate 300 of the electronic device. In order to have better SAR performance, at this time, L1 = L2 ≈ l (l is a constant and λg is the wavelength corresponding to the resonance of the antenna, that is, the working wavelength of the antenna). At this time, the antenna can obtain better SAR performance, and the structure of the antenna is shown in FIG. 14. For example, when L1 = L2 = 18 mm, S = 1 mm, and g = 1 mm, the SAR hotspot distribution of the antenna at 1.75 GHz is shown in FIG. 21. Compared with the back 5 mm body SAR hotspot distribution of the conventional IFA antenna (FIG. 21(a)), the SAR hotspot distribution of the low SAR single-feed T antenna is obviously more dispersed.

[0120] b) when D ≠ 0

[0121] The ground position 330 of the antenna cannot satisfy D = 0. In order to still maintain that the antenna has a more dispersed SAR hotspot distribution at 1.75 GHz, it is necessary to maintain that the excitation degree of the horizontal half-wave mode of the top edge of the conductive plate 300 and the excitation degree of the vertical full-wave mode of the side edge of the conductive plate 300 are similar. For example, as shown in FIG. 22, the above formula (1) should be satisfied, that is, L1 = L2.

[0122] In order to maintain that the two branches of the antenna maintain a certain projection area (maintain the coupling amount) on the top edge of the conductive plate 300 and the right side edge of the conductive plate 300 respectively, the following formula should be satisfied:

[0123] In the case of satisfying the formula (1) and the formula (2), the SAR hotspot map of the antenna can still achieve a more uniform distribution, and the antenna structure is shown in FIG. 22 and FIG. 23. As shown in the case of FIG. 22, when L1=L2=18mm, S=1mm, and g=1mm, according to the above formula, D should satisfy 0≤D≤10mm, and D=4mm and D=10mm are taken for simulation experiments respectively, and the SAR hotspot distribution of the antenna at 1.75GHz is shown in FIG. 24(c). Compared with the SAR hotspot distribution of the traditional IFA antenna (FIG. 24(a)), it can be seen that the SAR hotspot distribution of the low-SAR single-feed T antenna is still obviously more dispersed. When D=10mm, the SAR hotspot distribution area is close to the traditional scheme.

[0124] Table 3 shows the normalized SAR performance comparison of the low-SAR single-feed T antenna scheme and the traditional IFA antenna scheme when D=0mm, D=4mm, and D=10mm respectively. Compared with the traditional IFA antenna, when D=0mm, the normalized SAR gain of the low-SAR single-feed T antenna scheme is 1dB; when D=4mm, the SAR gain of the low-SAR single-feed T antenna scheme is 0.8dB; and when D=10mm, there is no SAR gain. This phenomenon is consistent with the formula (2).

[0125] Table 3: Normalized SAR performance comparison of the single-feed T antenna provided by the embodiment of the application under different l and D values

[0126] In this embodiment, when D=0 and L1≈L2, the antenna has the best SAR performance, and when D≠0, the following conditions should be met and The antenna still has a better SAR performance gain.

[0127] Optionally, referring to FIG. 22, the feeding circuit 200 includes a second feed source 220, the lower ground position 330 is located at the first edge 310, the grounding point 130 is a position point of the first radiation branch 110 opposite to the lower ground position 330, and the second feed source 220 is electrically connected with the second radiation branch 120; or,

[0128] Referring to FIG. 25, the feeding circuit 200 includes a first feed source 210, the lower ground position 330 is located at the first edge 310, the grounding point 130 is a position point of the first radiation branch 110 opposite to the lower ground position 330, the first feed source 210 is electrically connected with the feeding point 140 of the first radiation branch 110, and the feeding point 140 is located on a side of the grounding point 130 away from the second radiation branch 120; or,

[0129] Referring to FIG. 23, the feeding circuit 200 includes a first feed source 210, the ground position 330 is located at the second edge 320, the grounding point 130 is a position point of the second radiating branch 120 opposite to the ground position 330, and the first feed source 210 is electrically connected to the first radiating branch 110;

[0130] Referring to FIG. 26, the feeding circuit 200 includes a second feed source 220, the ground position 330 is located at the second edge 320, the grounding point 130 is a position point of the second radiating branch 120 opposite to the ground position 330, the second feed source 220 is electrically connected to the feeding point 140 of the second radiating branch 120, and the feeding point 140 is located at a side of the grounding point 130 away from the first radiating branch 110; or,

[0131] Referring to FIG. 27, the feeding circuit 200 includes a second feed source 220, the ground position 330 is located at the first edge 310, the grounding point 130 is a position point of the first radiating branch 110 opposite to the ground position 330, the second feed source 220 is electrically connected to the second radiating branch 120, and the first tuning point in the first radiating branch 110 is grounded through a first tuning circuit 500, the first tuning point is located at a side of the grounding point 130 away from the second radiating branch 120; or,

[0132] Referring to FIG. 28, the feeding circuit 200 includes a first feed source 210, the ground position 330 is located at the first edge 310, the grounding point 130 is a position point of the first radiating branch 110 opposite to the ground position 330, the first feed source 210 is electrically connected to the feeding point 140 of the first radiating branch 110, and the feeding point 140 is located at a side of the grounding point 130 away from the second radiating branch 120, and the second tuning point in the second radiating branch 120 is grounded through a second tuning circuit 400; or,

[0133] Referring to FIG. 29, the feeding circuit 200 includes a first feed source 210, the ground position 330 is located at the second edge 320, the grounding point 130 is a position point of the second radiating branch 120 opposite to the ground position 330, the first feed source 210 is electrically connected to the first radiating branch 110, and the second tuning point in the second radiating branch 120 is grounded through a second tuning circuit 400, the second tuning point is located at a side of the grounding point 130 away from the first radiating branch 110;

[0134] Please refer to Fig. 30, the feeding circuit 200 includes a second feed source 220, the ground position 330 is located at the second edge 320, the grounding point 130 is the point opposite to the ground position 330 in the second radiating branch 120, the second feed source 220 is electrically connected to the feeding point 140 of the second radiating branch 120, and the feeding point 140 is located at the side of the grounding point 130 away from the first radiating branch 110, and the second tuning point in the first radiating branch 110 is grounded through the second tuning circuit 400.

[0135] As shown in Fig. 22, in some embodiments of the present application, the antenna structure to which the above-mentioned antenna radiator 100 belongs is a single-feed T antenna with the ground position deviated from the corner (the right upper corner of the conductive plate 300 is taken as an example in the figure), and the deviation is represented by D. The medium with a dielectric constant of ε r between the antenna and the conductive plate 300. The antenna feeding point can be located at the top edge of the conductive plate 300, as shown in Fig. 22, the feeding circuit 200 includes a second feed source 220, the ground position 330 is located at the first edge 310, the grounding point 130 is the point opposite to the ground position 330 in the first radiating branch 110, and the second feed source 220 is electrically connected to the second radiating branch 120. The antenna feeding point can also be located at the side edge of the conductive plate 300, as shown in Fig. 23, the feeding circuit 200 includes a first feed source 210, the ground position 330 is located at the first edge 310, the grounding point 130 is the point opposite to the ground position 330 in the first radiating branch 110, the first feed source 210 is electrically connected to the feeding point 140 of the first radiating branch 110, and the feeding point 140 is located at the side of the grounding point 130 away from the second radiating branch 120. The ground position can be deviated towards the middle of the top edge, as shown in Fig. 25, or towards the middle of the side edge, as shown in Fig. 23.

[0136] When the antenna works, there are two resonance modes, the resonance mode of the lower frequency band is the common mode, and the resonance mode of the higher frequency band is the differential mode. When the above-mentioned formulas (1) and (2) are satisfied, the antenna can still effectively excite the horizontal half-wave mode of the top edge of the conductive plate 300 and the vertical full-wave mode of the right side edge in the common mode, so that the near-field energy distribution of the antenna is more dispersed, and a lower SAR peak value is achieved. In addition, the tuning circuit is added on the side of the non-feeding branch, which can be tuned, so that the resonance frequency further covers more frequency bands when the antenna remains in the common mode, as shown in Figs. 27-30.

[0137] In this embodiment, the single feed point design and flexible ground position are adopted, and the practicability is further enhanced. The antenna can obtain high radiation efficiency and low SAR peak value in a wide frequency band. Compared with the traditional IFA scheme, the normalized SAR performance of the antenna scheme can obtain a gain of 1 dB or less.

[0138] Optionally, the conductive plate 300 comprises a ground position 330, the antenna radiator 100 is electrically connected with the ground position 330, the ground position 330 is located at a first top corner 340 of the conductive plate 300, and the first top corner 340 is a top corner at a connection between the first side 310 and the second side 320.

[0139] The equivalent electrical length of the first radiation branch 110 and the equivalent electrical length of the second radiation branch 120 are respectively equal to the resonant length of the antenna to which the antenna radiator 100 belongs.

[0140] The resonant length l of the antenna to which the antenna radiator 100 belongs can be expressed as:

[0141] wherein λ g is the wavelength corresponding to the resonance of the antenna, ε r is the dielectric constant of the medium filled between the antenna radiator 100 and the conductive plate 300.

[0142] It can be understood that the first radiation branch 110 and the second radiation branch 120 only need to satisfy that the equivalent electrical length is equal to the resonant length of the antenna to which the antenna radiator 100 belongs, and the specific structure can be set as needed, for example, at least one of the first radiation branch 110 and the second radiation branch 120 has a segment gap.

[0143] In this embodiment, by electrically connecting the antenna radiator 100 with the ground position 330, the ground position 330 is located at the first top corner 340 of the conductive plate 300, the first top corner 340 is a top corner at a connection between the first side 310 and the second side 320, and the equivalent electrical length of the first radiation branch 110 is equal to the equivalent electrical length of the second radiation branch 120, and the equivalent electrical length of the first radiation branch 110 is equal to the resonant length of the antenna to which the antenna radiator 100 belongs, thus, on the basis of obtaining higher antenna radiation efficiency and lower normalized SAR of the antenna, the structure type of the antenna is further enriched to adapt to more application scenarios.

[0144] Optionally, the second radiating branch 120 comprises: a second radiator 121 connected with the first radiating branch 110, and a second parasitic branch 122 having a second break 123 between one end of the second radiator 121 away from the first radiating branch 110, and the second parasitic branch 122, and a second capacitor 600 or a second tuning circuit 400 is connected across the second break 123, and the feed circuit 200 comprises a second feed source 220 electrically connected with the second parasitic branch 122; or,

[0145] The second radiating branch 120 comprises: a second radiator 121 connected with the first radiating branch 110, and a second parasitic branch 122 having a second break 123 between one end of the second radiator 121 away from the first radiating branch 110, and the second parasitic branch 122, and a second capacitor 600 or a second tuning circuit 400 is connected across the second break 123, and the feed circuit 200 comprises a second feed source 220 electrically connected with the second parasitic branch 122; or,

[0146] The first radiating branch 110 comprises: a first radiator 111 connected with the second radiating branch 120, and a first parasitic branch 112 having a first break 113 between one end of the first radiator 111 away from the second radiating branch 120, and the first parasitic branch 112, and a first capacitor 700 or a first tuning circuit 500 is connected across the first break 113, and the feed circuit 200 comprises a first feed source 210 electrically connected with the first parasitic branch 112; or,

[0147] The first radiating branch 110 comprises: a first radiator 111 connected with the second radiating branch 120, and a first parasitic branch 112 having a first break 113 between one end of the first radiator 111 away from the second radiating branch 120, and the first parasitic branch 112, and a first capacitor 700 or a first tuning circuit 500 is connected across the first break 113, and the feed circuit 200 comprises a first feed source 210 electrically connected with the first parasitic branch 112.

[0148] As shown in FIG. 31, in some embodiments of the present application, the antenna structure to which the above-mentioned antenna radiator 100 belongs is a single-break single-feed T antenna (for example, the right upper corner of the conductive plate 300 is taken as an example), and the dielectric constant between the antenna and the conductive plate 300 is ε rThe medium. The antenna feed point should be located on the branch containing the gap, either before the gap (as shown in Figure 31) or at the end of the branch after the gap (as shown in Figure 32). When a capacitor (C0) is connected in series with the gap... s When representing (), the equivalent electrical length L2 including the broken branch should be satisfied. eff_cs =L1≈l (l is a constant and λ g (Where the wavelength corresponds to the antenna resonance) The slit should be located in the middle of its branch to ensure a more uniform current distribution on the radiator when the antenna resonates. Taking the antenna scheme shown in Figure 31 as an example, when the antenna resonates, it has a larger aperture current distribution, as shown in Figure 39, and the radiation efficiency is further improved, as shown in Figure 40. At the same time, the increased coupling between the antenna branch and the side (or top) of the conductive plate 300 also makes the excitation of the resonant mode of the conductive plate 300 more sufficient, and the SAR peak is smaller. Table 4 lists the normalized SAR performance comparison of this embodiment. It can be seen that the normalized SAR of this embodiment is 1.5dB better than the traditional IFA antenna scheme, and better than the embodiments shown in Figures 13, 14, 19 and 20, showing a significant advantage in SAR performance. In order to keep the antenna in common-mode mode and further cover more frequency bands with the resonant frequency, the second capacitor 600 across the second slit can be replaced with the second tuning circuit 400 across the slit. The resonant frequency of the antenna can be adjusted by connecting capacitors of different capacitance values ​​in series with the second tuning circuit 400, as shown in Figures 33 and 34. Furthermore, placing the break at the top branch is also a solution covered in this embodiment, as shown in Figures 35 and 36, and will not be elaborated further here. Additionally, it should be understood that a certain degree of deviation in the antenna location in this embodiment still has beneficial effects, as shown in Figures 37 and 38. This is because L2 in this embodiment needs to be coordinated with the series capacitor value Cs to achieve L2. eff_cs =L1 condition, therefore when simply discussing the size of L2, it is not easy to obtain the specific value of L2, so no specific limitation is made on the relationship between the deviation distance of the following location and the size of L1 and L2.

[0149] Table 4: Comparison of Normalized SAR Performance

[0150] This implementation method has at least the following advantages: it can achieve higher antenna radiation efficiency and lower normalized SAR; compared with the traditional IFA scheme, the normalized SAR performance of this antenna scheme can gain 1.5dB.

[0151] Optionally, the first radiating branch 110 comprises a first radiator 111 and a first parasitic branch 112, and the second radiating branch 120 comprises a second radiator 121 and a second parasitic branch 122, the first radiator 111 is connected with the second radiator 121, the first parasitic branch 112 and the first radiator 111 are connected through a first gap 113, the first gap 113 is connected with a first capacitor 700 or a first tuning circuit 500, and the second parasitic branch 122 and the second radiator 121 are connected through a second gap 123, the second gap 123 is connected with a capacitor or a second tuning circuit 400.

[0152] As shown in FIGS. 41-48, in some embodiments of the present application, the antenna structure to which the above-mentioned antenna radiator 100 belongs is a double-gap single-feed T antenna (for example, the right upper corner of the conductive plate 300 is shown), and the antenna is filled with a medium with a dielectric constant of ε r between the antenna and the conductive plate 300. The antenna feed point can be located at the top branch or the side branch, as shown in FIGS. 41 and 43; it can be located in front of the gap, as shown in FIG. 41, or at the end of the branch after the gap, as shown in FIG. 42. When a series capacitor (the capacitor is represented by C s1 , C s2 ) is connected across the gap, the equivalent electrical length L2 eff_cs of the branch containing the gap should satisfy L1 eff_cs ≈l (l is a constant and λ g is the corresponding wavelength when the antenna resonates). In this way, when the antenna resonates, the current distribution of the antenna scheme shown in FIG. 41 is further expanded, as shown in FIG. 49, and the radiation efficiency is improved, as shown in FIG. 50. At the same time, the increased coupling between the antenna branch and the side and top edges of the conductive plate 300 also makes the excitation of the resonant mode of the conductive plate 300 more sufficient, and the SAR peak is smaller. Table 5 lists the normalized SAR performance of the present embodiment, and it can be seen that the normalized SAR of the present embodiment is 1.6 dB better than that of the conventional IFA antenna scheme 1, and has obvious advantages in SAR performance. In order to further cover more frequency bands while keeping the antenna in the common mode, the capacitor across the gap can be replaced by a tuning circuit across the gap, and the resonant frequency of the antenna can be adjusted by connecting capacitors with different capacitance values in series on the switch circuit, as shown in FIGS. 45 and 46, or a tuning circuit is arranged at both gaps, as shown in FIGS. 47 and 48. In addition, by analogy with Embodiment Four, it should be understood that in the present embodiment, the lower point of the antenna can also deviate from the corner to a certain extent. Since the values of L1 eff_cs , L2 eff_cs in the present embodiment are determined by L1, L2 and the values of the series capacitors C s1 , C s2Both are determined, so the specific values of L1 and L2 are not easy to obtain, and therefore the size relationship between the ground point deviation distance and L1 and L2 is not specifically limited in the embodiment.

[0153] Table 5: Comparison of normalized SAR performance

[0154] The embodiment has at least the following beneficial effects: higher antenna radiation efficiency and lower normalized SAR can be obtained; compared with the conventional IFA scheme, the normalized SAR performance of the antenna scheme can obtain a gain of 1.6 dB.

[0155] Optionally, the electronic device includes a conductive frame, and the conductive frame includes the antenna radiator 100.

[0156] The conductive frame can be used as a middle frame of the electronic device, and specifically can be a metal middle frame.

[0157] In the embodiment, since the conductive frame includes the antenna radiator 100, the hot spot distribution of the metal frame antenna can be more dispersed, and the SAR peak value of the metal frame antenna can be reduced.

[0158] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. An electronic device, comprising an antenna radiator, a feed circuit and a conductive plate, the conductive plate is grounded, the antenna radiator comprises a first radiating branch and a second radiating branch arranged at an included angle, the conductive plate comprises a first edge and a second edge adjacent to each other, the antenna radiator is arranged spaced apart from the conductive plate, the first radiating branch is opposite to the first edge, and the second radiating branch is opposite to the second edge; the feed circuit is electrically connected with the antenna radiator, and the antenna radiator is electrically connected with the conductive plate; in a case that the antenna radiator is in a working state, the antenna radiator excites a resonant mode of the first edge and the second edge of the conductive plate. The antenna radiator comprises a grounding point, the grounding point is located at a middle part of a length direction of the antenna radiator, and the grounding point is electrically connected with the conductive plate. The conductive plate comprises a grounding position, the grounding point is electrically connected with the grounding position, the grounding position is located at a first top corner of the conductive plate, and the first top corner is a top corner at a connection of the first edge and the second edge.

2. The electronic device of claim 1, wherein, The feed circuit comprises a first feed source and a second feed source, the first feed source is electrically connected with the first radiating branch, and the second feed source is electrically connected with the second radiating branch; or, 3. The electronic device of claim 2, wherein, The feed circuit comprises a first feed source and a power divider, the first feed source is electrically connected with the power divider, and the power divider is respectively electrically connected with the first radiating branch and the second radiating branch; or, 4. The electronic device of claim 3, wherein, The feed circuit comprises a first feed source, a power divider and a matching circuit, the first feed source is electrically connected with the power divider through the matching circuit, and the power divider is respectively electrically connected with the first radiating branch and the second radiating branch; or, The feed circuit comprises a first feed source, the first feed source is electrically connected with the first radiating branch; or, The feed circuit comprises a second feed source, the second feed source is electrically connected with the second radiating branch; or, The feed circuit comprises a first feed source, the first feed source is electrically connected with the first radiating branch, and the second radiating branch is grounded through a second tuning circuit; or, The feed circuit comprises a second feed source, the second feed source is electrically connected with the second radiating branch, and the first radiating branch is grounded through a first tuning circuit. Wherein, the D is a first distance, the L1 is a length of the first radiating branch, the L2 is a length of the second radiating branch, the s is a width of the antenna radiator, and the g is a distance between the antenna radiator and the conductive plate. The feed circuit comprises a second feed source, the grounding position is located at the first edge, the grounding point is a position point of the first radiating branch opposite to the grounding position, and the second feed source is electrically connected with the second radiating branch; or, 5.The electronic device of claim 2, wherein, The conductive plate includes a grounding position, the grounding point is electrically connected with the grounding position, a distance between the grounding position and a first top corner of the conductive plate is a first distance, the first top corner is a top corner at a connection of the first edge and the second edge, and the first distance is in a range of: The feed circuit comprises a first feed source, the grounding position is located at the first edge, the grounding point is a position point of the first radiating branch opposite to the grounding position, the first feed source is electrically connected with a feed point of the first radiating branch, and the feed point is located on a side of the grounding point away from the second radiating branch; or, 6. The electronic device of claim 5, wherein, ​ ​ The feeding circuit includes a first feed source, the ground position is located at the second side, the grounding point is a position opposite to the ground position in the second radiation branch, and the first feed source is electrically connected with the first radiation branch; The feeding circuit includes a second feed source, the ground position is located at the second side, the grounding point is a position opposite to the ground position in the second radiation branch, the second feed source is electrically connected with a feeding point of the second radiation branch, and the feeding point is located on a side of the grounding point away from the first radiation branch; or, The feeding circuit includes a second feed source, the ground position is located at the first side, the grounding point is a position opposite to the ground position in the first radiation branch, the second feed source is electrically connected with the second radiation branch, and a first tuning point in the first radiation branch is grounded through a first tuning circuit, and the first tuning point is located on a side of the grounding point away from the second radiation branch; or, The feeding circuit includes a first feed source, the ground position is located at the first side, the grounding point is a position opposite to the ground position in the first radiation branch, the first feed source is electrically connected with a feeding point of the first radiation branch, and the feeding point is located on a side of the grounding point away from the second radiation branch, and a second tuning point in the second radiation branch is grounded through a second tuning circuit; or, The feeding circuit includes a first feed source, the ground position is located at the second side, the grounding point is a position opposite to the ground position in the second radiation branch, the first feed source is electrically connected with the first radiation branch, and a second tuning point in the second radiation branch is grounded through a second tuning circuit, and the second tuning point is located on a side of the grounding point away from the first radiation branch; The feeding circuit includes a second feed source, the ground position is located at the second side, the grounding point is a position opposite to the ground position in the second radiation branch, the second feed source is electrically connected with a feeding point of the second radiation branch, and the feeding point is located on a side of the grounding point away from the first radiation branch, and a second tuning point in the first radiation branch is grounded through a second tuning circuit.

7. The electronic device of claim 1, wherein, The conductive plate includes a ground position, the antenna radiator is electrically connected with the ground position, and the ground position is located at a first top corner of the conductive plate, the first top corner being a top corner at a connection between the first side and the second side; Equivalent electric lengths of the first radiation branch and the second radiation branch are equal to a resonant length of an antenna to which the antenna radiator belongs.

8. The electronic device of claim 7, wherein, The second radiation branch includes a second radiator and a second parasitic branch, the second radiator is connected with the first radiation branch, the second parasitic branch has a second break between an end of the second parasitic branch away from the first radiation branch and the second radiator, a second electric capacity or a second tuning circuit is connected across the second break, and the feeding circuit includes a second feed source electrically connected with the second radiator; or, The second radiating branch comprises a second radiator and a second parasitic branch, the second radiator is connected with the first radiating branch, the second parasitic branch has a second break between one end of the second radiator away from the first radiating branch, a second capacitor or a second tuning circuit is connected across the second break, the feed circuit comprises a second feed source, the second feed source is electrically connected with the second parasitic branch; or, The first radiating branch comprises a first radiator and a first parasitic branch, the first radiator is connected with the second radiating branch, the first parasitic branch has a first break between one end of the first radiator away from the second radiating branch, a first capacitor or a first tuning circuit is connected across the first break, the feed circuit comprises a first feed source, the first feed source is electrically connected with the first radiator; or, The first radiating branch comprises a first radiator and a first parasitic branch, the first radiator is connected with the second radiating branch, the first parasitic branch has a first break between one end of the first radiator away from the second radiating branch, a first capacitor or a first tuning circuit is connected across the first break, the feed circuit comprises a first feed source, the first feed source is electrically connected with the first parasitic branch.

9. The electronic device of claim 7, wherein, The first radiating branch comprises a first radiator and a first parasitic branch, the second radiating branch comprises a second radiator and a second parasitic branch, the first radiator is connected with the second radiator, the first parasitic branch has a first break between one end of the first radiator away from the second radiator, a first capacitor or a first tuning circuit is connected across the first break, the second parasitic branch has a second break between one end of the second radiator away from the first radiator, a second capacitor or a second tuning circuit is connected across the second break.

10. The electronic device according to any one of claims 1 to 9, wherein The electronic device comprises a conductive frame, and the conductive frame comprises the antenna radiator.

Images