Antenna assembly and electronic equipment
By designing antenna components with specific lengths and tuning circuits, the problem of frequency deviation and efficiency reduction of electronic devices in grip scenarios is solved, and a more uniform resonant current distribution and better grip resistance are achieved.
Patent Information
- Application Number
- CN202311382167.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-10-23
- Publication Date
- 2025-04-25
Smart Images
Figure CN119890679A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electronic technology, and in particular to an antenna assembly and an electronic device. Background Art
[0002] When an electronic device is held, the antenna radiator is affected by the holding and is prone to frequency deviation and reduced efficiency. Therefore, how to improve the anti-holding performance of the antenna assembly becomes a technical problem that needs to be solved. Summary of the invention
[0003] The present application provides an antenna assembly and an electronic device with good anti-gripping performance.
[0004] In one aspect, the present application provides an antenna assembly, comprising:
[0005] Feeds;
[0006] An antenna radiator, the antenna radiator comprising a ground end, a free end, a feeding point disposed between the ground end and the free end, and a first tuning point disposed between the ground end and the free end, the ground end being grounded, the feeding point being electrically connected to the feed source, and the length of the antenna radiator being less than 1 / 4 wavelength of the first frequency band; and
[0007] A first tuning circuit, wherein the first tuning circuit is capacitive, one end of the first tuning circuit is electrically connected to the first tuning point, the other end of the first tuning circuit is grounded, and the antenna radiator between the first tuning circuit, the ground end and the first tuning point is used to generate a first resonant mode supporting the first frequency band under the excitation of the feed source.
[0008] On the other hand, the present application also provides an electronic device, including a circuit board, a frame and the antenna assembly, the feed source and the first tuning circuit are arranged on the circuit board, and the antenna radiator is arranged on the frame.
[0009] The antenna assembly provided by the present application includes a feed source, an antenna radiator and a first tuning circuit. By making the length of the antenna radiator less than 1 / 4 wavelength of the first frequency band, the first tuning circuit is capacitive, one end of the first tuning circuit is electrically connected to the first tuning point of the antenna radiator, and the other end is grounded, so that the first tuning circuit, the antenna radiator between the ground end and the first tuning point forms an LC series resonant circuit that can support the first frequency band, and the resonant mode that can be generated on the antenna radiator to support the first frequency band is a resonant mode less than 1 / 4 wavelength, so that under the excitation of the feed source, the first tuning circuit, the antenna radiator between the ground end and the first tuning point generates a first resonant mode that supports the first frequency band. In the vibration mode, the intensity of the resonant current generated by the first resonant mode on the antenna radiator between the ground end and the first tuning point varies less, the resonant current is more evenly distributed, and there is no obvious current weakness. Therefore, when the antenna assembly is used in a holding scenario, the electric field strength area of the first resonant mode will not be held. At the same time, the first resonant mode basically does not generate any resonant current on the antenna radiator between the first tuning point and the free end. Therefore, whether the antenna radiator between the first tuning point and the free end is held has almost no effect on the first resonant mode, thereby reducing the frequency deviation and efficiency reduction in the first resonant mode in the holding scenario, so as to improve the anti-holding performance of the antenna assembly when working in the first frequency band. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below.
[0011] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;
[0012] Figure 2 A schematic diagram of a circuit structure of an antenna assembly provided in an embodiment of the present application;
[0013] Figure 3 for Figure 2 A schematic diagram of current distribution of a first resonant mode supporting a first frequency band generated by a first tuning circuit of the antenna assembly and an antenna radiator between a ground terminal and a first tuning point under the excitation of a feed source;
[0014] Figure 4 for Figure 2 The antenna radiator of the antenna assembly shown is equivalent to an inductor, the first tuning circuit is equivalent to a capacitor, and the antenna radiator and the first tuning circuit between the ground terminal and the first tuning point form a schematic diagram of an LC series resonant circuit;
[0015] Figure 5 for Figure 2A schematic diagram showing that a first resonant mode of the antenna assembly has a first resonant current I1 generated on a first tuning circuit, and a second resonant current I2 generated on an antenna radiator between a ground terminal and a first tuning point, and a flow direction of the first resonant current I1 is the same as a flow direction of the second resonant current I2;
[0016] Figure 6 for Figure 1 A schematic structural diagram showing that the frame of the electronic device includes a gripping area, and the antenna radiator between the ground terminal and the first tuning point is at least partially located in the gripping area;
[0017] Figure 7 for Figure 3 The return loss curve and efficiency curve of the antenna assembly shown in the free scene;
[0018] Figure 8 for Figure 3 Comparison curves of return loss and efficiency of the antenna assembly shown in the figure in free scenario and holding scenario;
[0019] Fig. 9 for Figure 2 A schematic diagram of a circuit structure in which the first tuning point D of the antenna assembly coincides with the feeding point C;
[0020] Fig.10 for Fig. 9 A schematic diagram of the circuit structure of the first tuning circuit of the antenna assembly shown includes a first sub-tuning circuit and a second sub-tuning circuit;
[0021] Fig.11 for Fig.10 The first resonant mode of the antenna assembly shown has a first sub-resonant current I11 generated on the first sub-tuning circuit, a second sub-resonant current I12 generated on the second sub-tuning circuit, and a second resonant current I2 generated on the antenna radiator between the ground terminal and the feeding point, and the flow direction of the first sub-resonant current I11, the flow direction of the second sub-resonant current I12 and the flow direction of the second resonant current I2 are the same;
[0022] Fig.12 for Fig.11 A schematic diagram of a circuit structure in which a first sub-tuning circuit of the antenna assembly includes a capacitor and an inductor connected in series, and a second sub-tuning circuit includes an inductor;
[0023] Fig.13 for Fig.12 A schematic diagram of the distribution of the resonant current on the first sub-tuning circuit and the second sub-tuning circuit of the antenna assembly;
[0024] Fig.14 for Fig.11A schematic diagram of a circuit structure in which the first sub-tuning circuit of the antenna assembly includes a capacitor and the second sub-tuning circuit includes an inductor;
[0025] Fig.15 for Fig.11 A schematic diagram of a circuit structure in which the first sub-tuning circuit of the antenna assembly includes a capacitor, and the second sub-tuning circuit includes an inductor and a capacitor connected in series;
[0026] Fig.16 for Fig.11 A schematic diagram of a circuit structure in which a first sub-tuning circuit of the antenna assembly includes a capacitor and an inductor connected in series, and a second sub-tuning circuit includes a capacitor;
[0027] Fig.17 for Fig.11 A schematic diagram of a circuit structure in which the first sub-tuning circuit of the antenna assembly includes an inductor and the second sub-tuning circuit includes a capacitor;
[0028] Fig.18 for Figure 2 A schematic diagram of current distribution of a second resonance mode supporting a second frequency band generated by an antenna radiator between a ground end and a free end of the antenna assembly under the excitation of a feed source;
[0029] Fig.19 for Fig.18 The antenna radiator of the antenna assembly shown further includes a second tuning point disposed between the ground end and the free end, and the antenna assembly further includes a circuit structure schematic diagram of a second tuning circuit electrically connected to the second tuning point;
[0030] Fig. 20 for Fig.19 A schematic structural diagram of a second tuning circuit of the antenna assembly shown;
[0031] Fig.21 for Fig.19 The antenna assembly further includes a switching switch, the switching switch electrically connects the first tuning point, the second tuning point, the first tuning circuit and the second tuning circuit, and the switching switch switches between the first tuning circuit and the second tuning circuit to make one of the first tuning circuit and the second tuning circuit conduct with the antenna radiator;
[0032] Fig. 22 for Fig.19 A schematic diagram of a circuit structure in which the second tuning point E of the antenna assembly coincides with the feeding point C;
[0033] Fig.23 for Fig. 20 A schematic diagram of a circuit structure in which the second tuning circuit of the antenna assembly includes a third sub-tuning circuit and a fourth sub-tuning circuit;
[0034] Fig.24 for Fig.23 The third sub-tuning circuit shown includes a capacitor, and the fourth sub-tuning circuit 502 includes a circuit structure diagram of a capacitor;
[0035] Fig.25 for Fig. 22 The return loss curve and efficiency curve of the antenna assembly shown in the free scene;
[0036] Fig.26 for Fig. 22 Comparative graph of return loss and efficiency of the antenna assembly shown in the figure in free scenario and holding scenario.
[0037] Description of reference numerals:
[0038] Electronic device 1000; antenna assembly 100; circuit board 200; frame 300; feed source 20; antenna radiator 10; first tuning circuit 40; first sub-frame 31; second sub-frame 32; third sub-frame 33; fourth sub-frame 34; ground terminal A; free terminal B; feeding point C; first tuning point D; holding area 35; first sub-tuning circuit 401; second sub-tuning circuit 402; second tuning point E; second tuning circuit 50; switching switch 60; third sub-tuning circuit 501; fourth sub-tuning circuit 502. DETAILED DESCRIPTION
[0039] The technical solution provided by the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.
[0040] References to "embodiments" and "implementations" in this application mean that the specific features, structures, or characteristics described in conjunction with the embodiments or implementations may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.
[0041] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned description of the drawings are used to distinguish different objects rather than to describe a specific order; the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. In addition, the terms "end" and "point" in the specification and claims of this application and the above-mentioned description of the drawings may indicate a small section of the antenna radiator relative to the antenna radiator as a whole, that is, "end" cannot be narrowly understood as an end, and "point" cannot be narrowly understood as a point.
[0042] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of an electronic device 1000 provided in an embodiment of the present application is shown in FIG. Figure 2 A schematic diagram of a circuit structure of an antenna assembly 100 provided in an embodiment of the present application. The electronic device 1000 may be a device with communication functions such as a mobile phone, a tablet, a watch, etc. In the embodiment of the present application, the electronic device 1000 takes a mobile phone as an example, which may be a straight-screen mobile phone or a foldable mobile phone. The electronic device 1000 includes a circuit board 200, a frame 300 and an antenna assembly 100. The antenna assembly 100 includes a feed source 20, an antenna radiator 10 and a first tuning circuit 40.
[0043] Among them, the circuit board 200 can be the main board of the electronic device 1000 or the auxiliary board. The following embodiments take the main board as an example unless explicitly stated. When divided by the number of structural layers, the circuit board 200 can be one of a single-sided circuit board, a double-sided circuit board, and a multi-layer circuit board. When divided by bending characteristics, the circuit board 200 can be one of a flexible circuit board, a rigid circuit board, and a rigid-flexible board. When divided by molding process, the circuit board 200 can be one of a printed circuit board (Printed Circuit Boards, PCB), a flexible printed circuit board (Flexible Printed Circuit, FPC), a laser circuit board (Laser Direct Structuring, LDS), etc. The circuit board 200 includes a ground layer.
[0044] The frame 300 may be a metal frame or a non-metal frame. For example, the frame 300 may be an aluminum alloy frame, a titanium alloy frame, a stainless steel frame, a plastic frame, a glass frame, etc. The frame 300 includes a first sub-frame 31, a second sub-frame 32, a third sub-frame 33, and a fourth sub-frame 34 connected end to end in sequence. The present application does not specifically limit the bending connection method between the first sub-frame 31 and the second sub-frame 32, between the second sub-frame 32 and the third sub-frame 33, between the third sub-frame 33 and the fourth sub-frame 34, and between the fourth sub-frame 34 and the first sub-frame 31. For example: the first sub-frame 31 and the second sub-frame 32, the second sub-frame 32 and the third sub-frame 33, the third sub-frame 33 and the fourth sub-frame 34, and the fourth sub-frame 34 and the first sub-frame 31 can all be connected by a straight line bending; or, the first sub-frame 31 and the second sub-frame 32, the second sub-frame 32 and the third sub-frame 33, the third sub-frame 33 and the fourth sub-frame 34, and the fourth sub-frame 34 and the first sub-frame 31 can all be connected by a circular arc bending. In the embodiment of the present application, the first sub-frame 31 can be understood as the top frame of the electronic device 1000, the third sub-frame 33 can be understood as the bottom frame of the electronic device 1000, the second sub-frame 32 can be understood as the left frame of the electronic device 1000, and the fourth sub-frame 34 can be understood as the right frame of the electronic device 1000. The first sub-frame 31, the second sub-frame 32, the third sub-frame 33 and the fourth sub-frame 34 are surrounded to form a receiving space. The receiving space can accommodate the circuit board 200, the antenna assembly 100, etc.
[0045] The feed source 20 can be understood as a port of the antenna assembly 100 disposed on the circuit board 200 and used to electrically connect to the RF chip. The feed source 20 receives the RF current emitted by the RF chip to excite the antenna radiator 10 to generate a resonant current I.
[0046] The antenna radiator 10 is arranged on the frame 300. It should be noted that the antenna radiator 10 described in the present application being arranged on the frame 300 can be understood as the antenna radiator 10 being integrated into the frame 300; or it can also be understood as the antenna radiator 10 being arranged on the inner side of the frame 300; or it can also be understood as the antenna radiator 10 being arranged in the space between the frame 300 and the circuit board 200. In other words, the antenna radiator 10 can be the frame 300 antenna radiator 10, or it can be a built-in antenna radiator 10. Optionally, part of the antenna radiator 10 is arranged on any sub-frame of the first sub-frame 31, the second sub-frame 32, the third sub-frame 33 and the fourth sub-frame 34, and another part of the antenna radiator 10 is arranged on a sub-frame adjacent to the sub-frame; or, all of the antenna radiators 10 can be arranged on any sub-frame of the first sub-frame 31, the second sub-frame 32, the third sub-frame 33 and the fourth sub-frame 34.
[0047] The antenna radiator 10 can generate a resonant current I under the excitation of the feed source 20 to receive and / or transmit an electromagnetic wave signal of a certain frequency band. The antenna radiator 10 includes a ground terminal A, a free terminal B, a feeding point C disposed between the ground terminal A and the free terminal B, and a first tuning point D disposed between the ground terminal A and the free terminal B.
[0048] The ground terminal A can be understood as the end of the antenna radiator 10 for direct or indirect electrical connection to the reference ground. Among them, the reference ground refers to the part of the earth in the electronic device 1000 that is not affected by any grounding configuration and is regarded as conductive. The potential of the reference ground is agreed to be zero. For example: the reference ground may include the ground layer of the main board, the ground layer of the sub-board, the metal parts of the middle frame, and the conductive parts electrically connected to one or more of the ground layer of the main board, the ground layer of the sub-board, and the metal parts of the middle frame in the electronic device 1000. The ground terminal A is grounded. In other words, the ground terminal A is electrically connected to the reference ground. The ground terminal A and the reference ground can be directly electrically connected, or indirectly electrically connected through electrical connectors such as metal springs. It can be understood that the ground terminal A is in a short-circuit state. The grounding described in the following embodiments, unless explicitly stated, can be understood as directly or indirectly electrically connected to the ground layer of the circuit board 200.
[0049] The free end B can be understood as the end of the antenna radiator 10 that is not electrically connected to the conductive member or has an isolation gap between the antenna radiator 10 and the conductive member. The free end B is in an open circuit state.
[0050] The feed point C is electrically connected to the feed source 20. The feed point C can be understood as the position point where the antenna radiator 10 is used to receive the excitation current of the feed source 20. The feed point C is located between the ground terminal A and the free end B. In one possible embodiment, the distance between the feed point C and the free end B may be smaller than the distance between the feed point C and the ground terminal A. In other words, the feed point C may be relatively close to the free end B and relatively far from the ground terminal A. Of course, in other embodiments, the distance between the feed point C and the free end B may also be equal to or greater than the distance between the feed point C and the ground terminal A. The feed point C and the feed source 20 may be directly electrically connected, or indirectly electrically connected through electrical connectors such as metal springs.
[0051] The first tuning point D can be understood as a position point where the antenna radiator 10 is used to electrically connect the first tuning circuit 40. The first tuning point D can be spaced apart from the feeding point C, or can coincide with the feeding point C. When the first tuning point D is spaced apart from the feeding point C, the first tuning point D can be located between the feeding point C and the ground terminal A, or the first tuning point D can be located between the feeding point C and the free end B.
[0052] The length of the antenna radiator 10 is less than 1 / 4 wavelength of the first frequency band. In the embodiment of the present application, the length of the antenna radiator 10 is the length from the ground end A to the free end B. The present application does not specifically limit the first frequency band. For example: the first frequency band can be any frequency band in the low frequency band less than 1 GHz, or the first frequency band can also be any frequency band in the medium and high frequency band greater than 1 GHz and less than 2 GHz. The technical solution provided in the present application requires tuning a resonant mode that can improve the anti-grip performance on the antenna radiator 10 through the first tuning circuit 40, and the lower the frequency band, the longer the current path required. Therefore, when the first frequency band is a low frequency band less than 1 GHz or a medium and high frequency band greater than 1 GHz and less than 2 GHz, it is easier to tune the required resonant mode on the antenna radiator 10 through the first tuning circuit 40. In one possible implementation, the length of the antenna radiator 10 is equal to 1 / 8 wavelength of the first frequency band. In another possible implementation, the length of the antenna radiator 10 is equal to 1 / 16 wavelength of the first frequency band.
[0053] The wavelength of the first frequency band can be calculated by c / f, where c can be selected as 3×10 8 , f is the center frequency of the first frequency band. Taking the GPS-L5 frequency band as an example, the center frequency of the first frequency band is 1.176 GHz, and it can be calculated that the 1 / 4 wavelength of the first frequency band is about 64 mm. In a possible implementation, the length of the antenna radiator 10 can be designed to be 30 mm to 50 mm.
[0054] The first tuning circuit 40 is capacitive. In other words, the first tuning circuit 40 includes at least one capacitor; or, the first tuning circuit 40 includes at least one capacitor and at least one inductor, wherein the effect of the capacitor is greater than that of the inductor. One end of the first tuning circuit 40 is electrically connected to the first tuning point D, and the other end of the first tuning circuit 40 is grounded. The first tuning circuit 40 and the first tuning point D may be directly electrically connected or indirectly electrically connected. The first tuning circuit 40 and the grounding layer of the circuit board 200 may be directly electrically connected or indirectly electrically connected. It can be understood that the first tuning circuit 40 can form a return path for the resonant current I on the antenna radiator 10.
[0055] Please refer to Figure 2 and Figure 3 , the antenna radiator 10 between the first tuning circuit 40, the ground terminal A and the first tuning point D is used to generate a first resonance mode supporting the first frequency band under the excitation of the feed source 20. It can be understood that in the first resonance mode, there is a resonance current I on the antenna radiator 10 between the first tuning circuit 40, the ground terminal A and the first tuning point D, and there is almost no resonance current I on the antenna radiator 10 between the first tuning point D and the free end B. The first resonance mode is used to support the reception and / or transmission of electromagnetic wave signals in the first frequency band.
[0056] By making the length of the antenna radiator 10 less than 1 / 4 wavelength of the first frequency band, the 1 / 4 wavelength mode supporting the first frequency band on the antenna radiator 10 under the excitation of the feed source 20 can be reduced or avoided, that is, the electric field intensity region of the first resonance mode is avoided to be formed at the free end B of the antenna radiator 10. In addition, the length of the antenna radiator 10 being less than 1 / 4 wavelength of the first frequency band is also a condition for tuning the first resonance mode of the antenna radiator 10 to improve the anti-grip performance through the first tuning circuit 40.
[0057] like Figure 4 As shown, the equivalent resonant circuit corresponding to the first resonant mode is an LC series resonant circuit formed by the antenna radiator 10 and the first tuning circuit 40 between the ground terminal A and the first tuning point D. Wherein, L is the inductance, and C is the capacitance. Since the antenna radiator 10 is equivalent to an inductance in the equivalent resonant circuit corresponding to the first resonant mode, and the first tuning circuit 40 is capacitive, that is, the first tuning circuit 40 is equivalent to a capacitor in the equivalent resonant circuit corresponding to the first resonant mode, the antenna radiator 10 and the first tuning circuit 40 between the ground terminal A and the first tuning point D form an LC series resonant circuit, so that the first tuning circuit 40, the antenna radiator 10 between the ground terminal A and the first tuning point D can generate a first resonant mode supporting the first frequency band under the excitation of the feed source 20. The length of the antenna radiator 10 is less than 1 / 4 wavelength of the first frequency band, and the length of the antenna radiator 10 between the ground terminal A and the first tuning point D must also be less than 1 / 4 wavelength. At this time, the first resonant mode is a resonant mode less than 1 / 4 wavelength. This can reduce the intensity change of the resonant current I on the antenna radiator 10 between the ground terminal A and the first tuning point D in the first resonant mode, and improve the distribution uniformity of the resonant current I on the antenna radiator 10 between the ground terminal A and the first tuning point D, thereby reducing the impact of holding on the first resonant mode. In one possible embodiment, the first resonant mode on the antenna radiator 10 between the ground terminal A and the first tuning point D can be or is close to a 1 / 8 wavelength mode. In another possible embodiment, the first resonant mode on the antenna radiator 10 between the ground terminal A and the first tuning point D can be or is close to a 1 / 16 wavelength mode.
[0058] The antenna assembly 100 provided in the present application includes a feed source 20, an antenna radiator 10 and a first tuning circuit 40. By making the length of the antenna radiator 10 less than 1 / 4 wavelength of the first frequency band, the first tuning circuit 40 is capacitive, one end of the first tuning circuit 40 is electrically connected to the first tuning point D of the antenna radiator 10, and the other end is grounded, so that the first tuning circuit 40, the antenna radiator 10 between the ground terminal A and the first tuning point D forms an LC series resonant circuit that can support the first frequency band, and the resonant mode that can be generated on the antenna radiator 10 to support the first frequency band is a resonant mode less than 1 / 4 wavelength, so that under the excitation of the feed source 20, the first tuning circuit 40, the antenna radiator 10 between the ground terminal A and the first tuning point D generates a resonance mode that supports the first frequency band. In the first resonance mode of the frequency band, the intensity of the resonant current I generated on the antenna radiator 10 between the ground terminal A and the first tuning point D in the first resonance mode varies less, the resonant current I is more evenly distributed, and there is no obvious current weakness, so that when the antenna component 100 is used in a holding scenario, the electric field strength area of the first resonance mode will not be held. At the same time, the antenna radiator 10 between the first tuning point D and the free end B in the first resonance mode basically does not generate the resonant current I. Therefore, whether the antenna radiator 10 between the first tuning point D and the free end B is held has almost no effect on the first resonance mode, thereby reducing the frequency deviation and efficiency reduction in the first resonance mode in the holding scenario, so as to improve the anti-holding performance of the antenna component 100 when working in the first frequency band.
[0059] The first resonance mode forms a current strong area on the antenna radiator 10 between the ground terminal A and the first tuning point D. The resonant current generated by the first resonance mode on the antenna radiator 10 between the ground terminal A and the first tuning point D is evenly distributed. Since the ground terminal A is grounded, the ground terminal A is short-circuited and the current is strong and the electric field is weak, and the length of the antenna radiator 10 is less than 1 / 4 wavelength of the first frequency band, the antenna radiator 10 between the ground terminal A and the first tuning point D in the first resonance mode is a current strong area. It can be understood that the distribution of the resonant current I on the antenna radiator 10 between the ground terminal A and the first tuning point D in the first resonance mode is strong, and there is no current weak area, that is, there is no electric field strong area. In other words, there is no obvious change from strong to weak in the resonant current I on the antenna radiator 10 between the ground terminal A and the first tuning point D in the first resonance mode.
[0060] Among them, Figure 5 As shown in FIG. 1 , the first resonant mode has a first resonant current I1 generated on the first tuning circuit 40, and a second resonant current I2 generated on the antenna radiator 10 between the ground terminal A and the first tuning point D. The flow direction of the first resonant current I1 is the same as the flow direction of the second resonant current I2. Figure 5 The second resonant current I2 can refer to the attached Figure 5In this embodiment, the first resonance mode can also form a current strong area on the first tuning circuit 40. It can be understood that the first resonance mode is a circulating current mode. In this way, the efficiency of the first resonance mode can be improved, that is, the efficiency of the antenna assembly 100 when performing communication in the first frequency band can be improved.
[0061] like Figure 6 As shown, the frame 300 includes a holding area 35. The holding area 35 may include a finger overlap area and / or a palm overlap area in a holding scenario. The holding scenario may be a left-hand holding scenario, a right-hand holding scenario, a left-head-hand scenario, a right-head-hand scenario, etc. At least part of the antenna radiator 10 between the ground terminal A and the first tuning point D is arranged in the holding area 35, and is used to form a dielectric loading for the first resonant mode in a holding scenario. Optionally, the antenna radiator 10 between the ground terminal A and the first tuning point D may be entirely arranged in the holding area 35; or, the portion of the antenna radiator 10 between the ground terminal A and the first tuning point D that is close to the ground terminal A may be arranged in the holding area 35; or, the portion of the antenna radiator 10 between the ground terminal A and the first tuning point D that is close to the first tuning point D may be arranged in the holding area 35. At least part of the antenna radiator 10 between the ground end A and the first tuning point D forms a dielectric loading for the first resonant mode in a holding scenario. It can be understood that the efficiency of the first resonant mode of the antenna radiator 10 between at least part of the ground end A and the first tuning point D in the holding scenario is improved, that is, after at least part of the antenna radiator 10 between the ground end A and the first tuning point D forms a dielectric loading for the first resonant mode in a holding scenario, the efficiency of the first resonant mode is higher than the efficiency of the first resonant mode when no dielectric loading is formed on the first resonant mode.
[0062] In a possible embodiment, the efficiency of the first resonance mode after dielectric loading is greater than the efficiency of the first resonance mode in a free scenario.
[0063] Specifically, Figure 7 As shown, Figure 7 for Figure 3 The return loss curve and efficiency curve of the antenna assembly 100 in a free scene are shown. Figure 7 Curve a is the return loss curve of the antenna assembly 100 in a free scene, curve b is the radiation efficiency curve of the antenna assembly 100 in a free scene, and curve c is the system efficiency curve of the antenna assembly 100 in a free scene. Figure 7 It can be seen from the curve a that the antenna assembly 100 of the embodiment of the present application can support communication in the first frequency band, that is, the antenna radiator 10 between the first tuning circuit 40, the ground terminal A and the first tuning point D can generate a first resonant mode supporting the first frequency band under the excitation of the feed source 20. Figure 7It can be seen from curves b and c that the radiation efficiency of the first resonant mode in the free scene is about -9.24dB. The system efficiency of the first resonant mode in the free scene is about -10.4dB. The efficiency of the first resonant mode in the free scene is good, and the antenna assembly 100 can better receive and / or transmit electromagnetic wave signals in the first frequency band.
[0064] like Figure 8 As shown, Figure 8 for Figure 3 The graphs show a comparison of return loss and efficiency of the antenna assembly 100 in a free scenario and a held scenario. Figure 8 The middle curve d is the return loss curve of the antenna assembly 100 in a free scene. Figure 8 The middle curve e is the return loss curve of the antenna assembly 100 in a holding scenario. Figure 8 The middle curve f is the radiation efficiency curve of the antenna assembly 100 in a free scene. Figure 8 The middle curve g is the radiation efficiency curve of the antenna assembly 100 in a holding scenario. Figure 8 The middle curve h is the system efficiency curve of the antenna assembly 100 in a free scenario. Figure 8 The middle curve j is the system efficiency curve of the antenna assembly 100 in the holding scenario. Figure 8 It can be seen from the middle curves d and e that, compared with the free scene, the operating frequency band of the antenna assembly 100 in the holding scene is still the first frequency band and has not shifted. This is because the antenna radiator 10 generates a circulating current mode that supports the first frequency band under the excitation of the feed source 20. At this time, the resonant current I on the antenna radiator 10 between the ground terminal A and the first tuning point D is evenly distributed, so that when the antenna radiator 10 is held, the operating frequency band of the antenna assembly 100 does not shift. Figure 8 It can be seen from the middle curves f and g, and the curves h and j that the efficiency of the antenna assembly 100 in the first frequency band is improved in the holding scenario compared to the free scenario. This is because the first resonant mode only forms a strong current area in the antenna radiator 10, so when the antenna radiator 10 is held, it is held in the strong current area of the first resonant mode. At this time, the antenna radiator 10 in the holding scenario forms a dielectric loading on the first resonant mode, thereby improving the efficiency of the first resonant mode.
[0065] In the embodiment of the present application, the radiation efficiency of the first resonant mode in the free scenario is approximately -9.24dB. The radiation efficiency of the first resonant mode in the holding scenario is approximately -5.21dB. Due to the dielectric loading effect of the antenna radiator 10 on the first resonant mode, the radiation efficiency can be improved by approximately 4dB. The system efficiency of the first resonant mode in the free scenario is approximately -10.4dB. The system efficiency of the first resonant mode in the holding scenario is approximately -5.5dB. Due to the dielectric loading effect formed by the antenna radiator 10 on the first resonant mode, the system efficiency can be improved by approximately 5dB. It can be seen that by making the length of the antenna radiator 10 less than 1 / 4 wavelength of the first frequency band, the first tuning circuit 40 is capacitive, and the first resonant mode is generated in the antenna radiator 10 between the first tuning circuit 40, the ground terminal A and the first tuning point D, the efficiency of the first resonant mode in the holding scenario can be improved, and the anti-holding performance of the antenna component 100 in the first resonant mode can be improved, and even the performance of the antenna component 100 supporting the first frequency band in the holding scenario can be made better than the performance of the antenna component 100 supporting the first frequency band in the free scenario.
[0066] Please refer to Fig. 9 and Fig.10 In a possible embodiment, the first tuning point D coincides with the feed point C. The first tuning circuit 40 includes a first sub-tuning circuit 401 and a second sub-tuning circuit 402. The first sub-tuning circuit 401 is electrically connected between the feed point C and the feed source 20. One end of the second sub-tuning circuit 402 is electrically connected between the feed source 20 and the first tuning circuit 40, and the other end of the second sub-tuning circuit 402 is grounded. It can be understood that the first tuning circuit 40 is electrically connected to the feed source 20, the antenna radiator 10 and the ground. In this embodiment, the first sub-tuning circuit 401 is used to implement the design of the excitation current passing through the first frequency band between the feed source 20 and the feed point C, and the first sub-tuning circuit 401 and the second sub-tuning circuit 402 are also used together to form a return circuit for the resonant current I on the antenna radiator 10 in the first resonant mode. The first sub-tuning circuit 401 and the second sub-tuning circuit 402 are connected in series in the return circuit.
[0067] The first sub-tuning circuit 401 is capacitive, and / or the second sub-tuning circuit 402 is capacitive. It can be understood that the first sub-tuning circuit 401 includes at least one capacitor, and / or the second sub-tuning circuit 402 includes at least one capacitor. The first sub-tuning circuit 401, the second sub-tuning circuit 402, and the antenna radiator 10 between the ground terminal A and the feeding point C generate the first resonant mode under the excitation of the feed source 20.
[0068] like Fig.11As shown in FIG. 1 , the first resonant mode has a first sub-resonant current I11 generated on the first sub-tuning circuit 401, a second sub-resonant current I12 generated on the second sub-tuning circuit 402, and a second resonant current I2 generated on the antenna radiator 10 between the ground terminal A and the feeding point C. The first sub-resonant current I11 can refer to FIG. Fig.11 The second sub-resonant current I11 shown in the figure can refer to the attached Fig.11 The second resonant current I12 shown in FIG. Fig.11 The first sub-resonant current I11, the second sub-resonant current I12 and the second resonant current I2 have the same flow direction. The first resonant mode can form a current strong area on the first sub-tuning circuit 401, the second sub-tuning circuit 402 and the antenna radiator 10 between the ground terminal A and the feeding point C.
[0069] In this embodiment, the first tuning point D coincides with the feeding point C, and the first tuning circuit 40 includes a first sub-tuning circuit 401 and a second sub-tuning circuit 402. The first sub-tuning circuit 401 is electrically connected between the feeding point C and the feed source 20, one end of the second sub-tuning circuit 402 is electrically connected between the feed source 20 and the first tuning circuit 40, and the other end of the second sub-tuning circuit 402 is grounded, thereby realizing the bandpass design of the first frequency band and the design of the return circuit of the first resonant mode. Therefore, when the first sub-tuning circuit 401 is capacitive and / or the second sub-tuning circuit 402 is capacitive, the first sub-tuning circuit 401, the second sub-tuning circuit 402 and the antenna radiator 10 between the ground terminal A and the feeding point C can generate a first resonant mode capable of improving the anti-gripping performance under the excitation of the feed source 20.
[0070] In a possible implementation, the first sub-tuning circuit 401 includes at least one capacitor, and the second sub-tuning circuit 402 includes at least one inductor or at least one capacitor. The present application does not specifically limit the number of capacitors included in the first sub-tuning circuit 401, the capacitance of the capacitors, the number of capacitors and inductors included in the second sub-tuning circuit 402, the capacitance of the capacitors, and the inductance of the inductors. It is only required that the first tuning circuit 40 formed by the first sub-tuning circuit 401 and the second sub-tuning circuit 402 is capacitive. Fig.12 As shown, the first sub-tuning circuit 401 may include a capacitor and an inductor connected in series, and the second sub-tuning circuit 402 may include an inductor. At this time, the resonant currents on the first sub-tuning circuit 401 and the second sub-tuning circuit 402 are as shown in FIG. Fig.13 As shown by the dotted line. Fig.14 As shown, the first sub-tuning circuit 401 may include a capacitor, and the second sub-tuning circuit 402 may include an inductor. Fig.15As shown, the first sub-tuning circuit 401 may include a capacitor, and the second sub-tuning circuit 402 may include an inductor and a capacitor connected in series. Fig.16 As shown, the first sub-tuning circuit 401 may include a capacitor and an inductor connected in series, and the second sub-tuning circuit 402 may include a capacitor.
[0071] In this embodiment, the first sub-tuning circuit 401 includes at least one capacitor, and the second sub-tuning circuit 402 includes at least one inductor or at least one capacitor, so as to realize the bandpass design of the first frequency band between the feed source 20 and the feeding point C and the capacitive design of the first tuning circuit 40. At the same time, the impedance of the second sub-tuning circuit 402 can be guaranteed to avoid the excitation current from the feed source 20 directly returning to the ground through the second sub-tuning circuit 402, thereby improving the effectiveness of the first tuning circuit 40, the antenna radiator 10 between the ground terminal A and the first tuning point D to generate a first resonance mode supporting the first frequency band under the excitation of the feed source 20.
[0072] In another possible implementation, the first sub-tuning circuit 401 includes at least one inductor, and the second sub-tuning circuit 402 includes at least one capacitor. The present application does not specifically limit the number of inductors included in the first sub-tuning circuit 401 and the capacitance of the inductors, the number of capacitors included in the second sub-tuning circuit 402 and the capacitance of the capacitors, etc. It is only required that the first tuning circuit 40 formed by the first sub-tuning circuit 401 and the second sub-tuning circuit 402 is capacitive. Fig.17 As shown, the first sub-tuning circuit 401 may include an inductor, and the second sub-tuning circuit 402 may include a capacitor.
[0073] In this embodiment, the first sub-tuning circuit 401 includes at least one inductor, and the second sub-tuning circuit 402 includes at least one capacitor, so as to realize the bandpass design of the first frequency band between the feed source 20 and the feeding point C and the capacitive design of the first tuning circuit 40. At the same time, the impedance of the second sub-tuning circuit 402 can be guaranteed to avoid the excitation current from the feed source 20 directly returning to the ground through the second sub-tuning circuit 402, thereby improving the effectiveness of the first tuning circuit 40, the antenna radiator 10 between the ground terminal A and the first tuning point D to generate a first resonance mode supporting the first frequency band under the excitation of the feed source 20.
[0074] Furthermore, if Fig.18As shown, the antenna radiator 10 between the ground terminal A and the free end B is used to generate a second resonance mode supporting the second frequency band under the excitation of the feed source 20. It can be understood that in the second resonance mode, the antenna radiator 10 between the ground terminal A and the free end B has a third resonance current I3. The second resonance mode is used to support the reception and / or transmission of electromagnetic wave signals in the second frequency band. The center frequency of the second frequency band is higher than the center frequency of the first frequency band. In other words, 1 / 4 wavelength of the second frequency band is smaller than 1 / 4 wavelength of the first frequency band. For example: the second frequency band can be any frequency band in the medium and high frequency bands greater than 1 GHz and less than 3 GHz. In a possible embodiment, the second frequency band can be the GPS-L1 frequency band, and the center frequency of the second frequency band is 1.575 GHz.
[0075] By enabling the antenna radiator 10 between the ground end A and the free end B to generate a second resonant mode supporting the second frequency band under the excitation of the feed source 20, the reception and / or transmission of electromagnetic wave signals in the second frequency band can be achieved, thereby expanding the application scenarios of the antenna assembly 100.
[0076] In a possible embodiment, the length of the antenna radiator 10 is equal to 1 / 4 wavelength of the second frequency band, and the second resonant mode is a 1 / 4 wavelength mode supporting the second frequency band. Taking the second frequency band as the GPS-L1 band as an example, through the wavelength calculation formula, it can be obtained that the 1 / 4 wavelength of the second frequency band is approximately 47 mm. When the length of the antenna radiator 10 is equal to 1 / 4 wavelength of the second frequency band, the antenna radiator 10 between the ground terminal A and the free end B can generate a 1 / 4 wavelength mode supporting the second frequency band under the excitation of the feed source 20. The second resonant mode can also be understood as an inverted-F antenna (IFA) mode. The second resonant mode forms a strong current area at the ground terminal A and a weak current area at the free end B, and the current intensity between the ground terminal A and the free end B gradually changes from strong to weak.
[0077] In another possible embodiment, the length of the antenna radiator 10 is greater than or less than 1 / 4 wavelength of the second frequency band. Optionally, the length of the antenna radiator 10 may be greater than 1 / 4 wavelength of the second frequency band and less than 1 / 4 wavelength of the first frequency band; or, the length of the antenna radiator 10 may be less than 1 / 4 wavelength of the second frequency band.
[0078] like Fig.19As shown, the antenna radiator 10 also includes a second tuning point E disposed between the ground terminal A and the free end B. The second tuning point E can be understood as a position point of the antenna radiator 10 for electrically connecting the second tuning circuit 50. The second tuning point E can be spaced apart from the feeding point C, or can coincide with the feeding point C. When the second tuning point E is spaced apart from the feeding point C, the second tuning point E can be located between the feeding point C and the ground terminal A, or the second tuning point E can be located between the feeding point C and the free end B.
[0079] The antenna assembly 100 further includes a second tuning circuit 50. The second tuning circuit 50 is electrically connected to the second tuning point E. The second tuning circuit 50 may be directly electrically connected to the second tuning point E or indirectly electrically connected to the second tuning circuit 50. The second tuning circuit 50 is used to tune the second resonant mode so that the second resonant mode is a 1 / 4 wavelength mode supporting the second frequency band.
[0080] Wherein, the second tuning circuit 50 may include capacitors and / or inductors, etc. The present application does not specifically limit the number of capacitors and inductors included in the second tuning circuit 50. When the second tuning circuit 50 includes multiple capacitors, the multiple capacitors may be connected in series or in parallel. When the second tuning circuit 50 includes multiple inductors, the multiple inductors may be connected in series or in parallel. When the second tuning circuit 50 includes one or more capacitors and one or more inductors, the inductors and capacitors may be connected in series or in parallel.
[0081] Optional, such as Fig. 20 As shown in (1), the second tuning circuit 50 may include a capacitor and an inductor connected in series. Fig. 20 As shown in (2), the second tuning circuit 50 may also include a capacitor and an inductor connected in parallel. Fig. 20 As shown in (3), the second tuning circuit 50 may also include an inductor, a first capacitor and a second capacitor, wherein the inductor is connected in parallel with the first capacitor and then in series with the second capacitor. Fig. 20 As shown in (4), the second tuning circuit 50 may also include a first inductor, a second inductor and a capacitor, wherein the first inductor and the capacitor are connected in parallel and then in series with the second inductor. Fig. 20 As shown in (5), the second tuning circuit 50 may also include an inductor, a first capacitor and a second capacitor, wherein the inductor is connected in series with the first capacitor and then connected in parallel with the second capacitor. Fig. 20 As shown in (6), the second tuning circuit 50 may also include a first inductor, a second inductor and a capacitor, wherein the first inductor and the capacitor are connected in series and then in parallel with the second inductor. Fig. 20 As shown in (7), the second tuning circuit 50 may also include a sub-tuning circuit formed by connecting the first inductor and the first capacitor in parallel, and a sub-tuning circuit formed by connecting the second inductor and the second capacitor in parallel, and the two sub-tuning circuits are connected in series. Fig. 20As shown in (8), the second tuning circuit 50 may also include a sub-tuning circuit formed by a first inductor and a first capacitor connected in series, and a sub-tuning circuit formed by a second inductor and a second capacitor connected in series, and the two sub-tuning circuits are connected in parallel.
[0082] like Fig.21 As shown, the antenna assembly 100 further includes a switch 60. The switch 60 may be a single-pole double-throw switch, a single-pole four-throw switch, a double-pole double-throw switch, etc. The switch 60 electrically connects the first tuning point D, the second tuning point E, the first tuning circuit 40, and the second tuning circuit 50. The switch 60 switches between the first tuning circuit 40 and the second tuning circuit 50 so that one of the first tuning circuit 40 and the second tuning circuit 50 is connected to the antenna radiator 10. When the first tuning circuit 40 is connected to the antenna radiator 10 under the action of the switch 60, the antenna radiator 10 between the first tuning circuit 40, the ground terminal A, and the first tuning point D generates a first resonance mode supporting the first frequency band under the excitation of the feed source 20. When the second tuning circuit 50 is connected to the antenna radiator 10 under the action of the switch 60, the antenna radiator 10 between the ground terminal A and the free end B generates a second resonance mode supporting the second frequency band under the excitation of the feed source 20.
[0083] In one possible embodiment, please refer to Fig. 22 and Fig.23 , the second tuning point E coincides with the feeding point C. The second tuning circuit 50 includes a third sub-tuning circuit 501 and a fourth sub-tuning circuit 502. The third sub-tuning circuit 501 is electrically connected between the feeding point C and the feed source 20. One end of the fourth sub-tuning circuit 502 is electrically connected between the feeding point C and the third sub-tuning circuit 501, and the other end of the fourth sub-tuning circuit 502 is grounded. It can be understood that the second tuning circuit 50 is electrically connected to the feed source 20, the antenna radiator 10 and the ground. In this embodiment, the third sub-tuning circuit 501 is used to implement the design of the excitation current passing through the second frequency band between the feed source 20 and the feeding point C, and the fourth sub-tuning circuit 502 is used to tune the length of the antenna radiator 10 when the length of the antenna radiator 10 is greater than or less than 1 / 4 wavelength of the second frequency band, so that the second resonant mode is a 1 / 4 wavelength mode supporting the second frequency band.
[0084] Among them, the third sub-tuning circuit 501 may include capacitors and / or inductors, etc. The present application does not specifically limit the number of capacitors and the number of inductors included in the third sub-tuning circuit 501. When the third sub-tuning circuit 501 includes multiple capacitors, the multiple capacitors can be connected in series or in parallel. When the third sub-tuning circuit 501 includes multiple inductors, the multiple inductors can be connected in series or in parallel. When the third sub-tuning circuit 501 includes one or more capacitors and one or more inductors, the inductors and capacitors can be connected in series or in parallel.
[0085] The fourth sub-tuning circuit 502 may include capacitors and / or inductors, etc. The present application does not specifically limit the number of capacitors and inductors included in the fourth sub-tuning circuit 502. When the fourth sub-tuning circuit 502 includes multiple capacitors, the multiple capacitors may be connected in series or in parallel. When the fourth sub-tuning circuit 502 includes multiple inductors, the multiple inductors may be connected in series or in parallel. When the fourth sub-tuning circuit 502 includes one or more capacitors and one or more inductors, the inductors and capacitors may be connected in series or in parallel.
[0086] In a possible implementation, Fig.24 As shown, the third sub-tuning circuit 501 may include a capacitor, and the fourth sub-tuning circuit 502 may include a capacitor.
[0087] like Fig.25 As shown, Fig.25 for Fig. 22 The return loss curve and efficiency curve of the antenna assembly 100 in a free scene are shown. Fig.25 The curve k is the return loss curve of the antenna assembly 100 in a free scene, the curve l is the radiation efficiency curve of the antenna assembly 100 in a free scene, and the curve m is the system efficiency curve of the antenna assembly 100 in a free scene. Fig.25 It can be seen from the middle curve k that the antenna assembly 100 of the embodiment of the present application can support communication in the second frequency band, that is, the antenna radiator 10 between the ground end A and the free end B can generate a second resonance mode supporting the second frequency band under the excitation of the feed source 20. Fig.25 It can be seen from the middle curve l and the curve m that the radiation efficiency of the second resonance mode in the free scene is about -2.3dB. The system efficiency of the second resonance mode in the free scene is about -2.8dB. The efficiency of the second resonance mode in the free scene is good, and the antenna assembly 100 can better receive and / or transmit electromagnetic wave signals in the second frequency band.
[0088] like Fig.26 As shown, Fig.26 for Fig. 22 The graphs show a comparison of return loss and efficiency of the antenna assembly 100 in a free scenario and a held scenario. Fig.26 The middle curve n is a return loss curve when the antenna assembly 100 supports the second frequency band and is in a free scenario. Fig.26 The middle curve o is a return loss curve when the antenna assembly 100 supports the second frequency band and is in a holding scenario. Fig.26 The middle curve p is a radiation efficiency curve of the antenna assembly 100 supporting the second frequency band and in a free scenario. Fig.26 The middle curve q is a radiation efficiency curve when the antenna assembly 100 supports the second frequency band and is in a holding scenario. Fig.26The middle curve r is a system efficiency curve when the antenna assembly 100 supports the second frequency band and is in a free scenario. Fig.26 The middle curve s is the system efficiency curve when the antenna assembly 100 supports the second frequency band and is in a holding scenario. Fig.26 It can be seen from the middle curve n and curve o that, relative to the free scene, the operating frequency band of the antenna assembly 100 in the holding scene is left-biased relative to the second frequency band. This is because the antenna radiator 10 generates a 1 / 4 wavelength mode supporting the second frequency band under the excitation of the feed source 20. At this time, the distribution of the third resonant current I3 on the antenna radiator 10 between the ground terminal A and the free terminal B gradually changes from strong to weak, so that when the antenna radiator 10 is held, it is held in the electric field strength area of the second resonant mode, resulting in frequency deviation. Fig.26 It can be seen from the curves p, q, r and s that the radiation efficiency of the antenna assembly 100 in the second frequency band is reduced in the holding scenario compared to the free scenario. This is because when the antenna radiator 10 is held, it is held in the electric field strength area of the second resonance mode, and at this time, the antenna radiator 10 has a greater absorption effect on the second resonance mode. Fig.26 It can also be seen from curves p, q, r and s that before 1.35 GHz, compared with the free scenario, the radiation efficiency of the antenna assembly 100 in the second frequency band in the holding scenario is improved to a certain extent. This is because the antenna radiator 10 forms a certain dielectric loading in the holding scenario, thereby improving the efficiency before 1.35 GHz.
[0089] In the embodiment of the present application, the radiation efficiency of the second resonance mode in the free scenario is approximately -2.32dB. The radiation efficiency of the second resonance mode in the holding scenario is approximately -4.33dB. Relative to the free scenario, the radiation efficiency of the second resonance mode in the holding scenario is approximately 2dB lower. The system efficiency of the second resonance mode in the free scenario is approximately -2.8dB. The system efficiency of the second resonance mode in the holding scenario is approximately -5.8dB. Relative to the free scenario, the system efficiency of the second resonance mode in the holding scenario is approximately 3dB lower. However, since the second resonance mode is generated between the ground end A and the free end B of the antenna radiator 10, the second resonance mode is the 1 / 4 wavelength mode of the IFA, so overall the efficiency of the second resonance mode in the holding scenario is also relatively high, and the performance of the antenna assembly 100 operating in the second frequency band is also better.
[0090] Based on the above description, it can be found that the antenna assembly 100 provided in the present application can realize the communication of the first frequency band and the second frequency band, that is, it supports dual frequency. Among them, the communication of the first frequency band and the second frequency band can be switched. Since the first frequency band is supported by the first resonant mode generated on the antenna radiator 10 between the first tuning circuit 40, the ground terminal A and the first tuning point D, the current distribution of the antenna radiator 10 between the ground terminal A and the first tuning point D of the first resonant mode is uniform, and can all be strong current areas, so the antenna assembly 100 has good anti-hand-holding performance when communicating in the first frequency band, and the communication performance of the antenna assembly 100 in the first frequency band in the hand-holding scenario can be better than the communication performance of the antenna assembly 100 in the first frequency band in the free scenario. Since the second frequency band is supported by the second resonance mode generated on the antenna radiator 10 between the ground end A and the free end B, the current distribution of the second resonance mode on the antenna radiator 10 between the ground end A and the free end B gradually changes from strong to weak, so even if the anti-hand-holding performance of the antenna assembly 100 is not improved when performing communication in the second frequency band, the performance of the antenna assembly 100 in performing communication in the second frequency band in free scenes and holding scenes is still good. In other words, the antenna assembly 100 provided in the present application has better communication performance in both the first frequency band and the second frequency band, and has better anti-hand-holding performance in the first frequency band.
[0091] The features mentioned in the description, claims and drawings can be combined with each other as desired as long as they are meaningful within the scope of the present application. The advantages and features described for the antenna assembly 100 apply to the electronic device 1000 in a corresponding manner.
[0092] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application, and these improvements and modifications are also regarded as the scope of protection of the present application.
Claims
1. An antenna assembly, characterized in that: include: Feeds; An antenna radiator, the antenna radiator comprising a ground end, a free end, a feeding point arranged between the ground end and the free end, and a first tuning point arranged between the ground end and the free end, the ground end is grounded, the feeding point is electrically connected to the feed source, and the length of the antenna radiator is less than 1 / 4 wavelength of the first frequency band; and A first tuning circuit, wherein the first tuning circuit is capacitive, one end of the first tuning circuit is electrically connected to the first tuning point, the other end of the first tuning circuit is grounded, and the antenna radiator between the first tuning circuit, the ground end and the first tuning point is used to generate a first resonant mode supporting the first frequency band under the excitation of the feed source.
2. The antenna assembly according to claim 1, characterized in that: The first resonance mode forms a current intensity region on the antenna radiator between the ground terminal and the first tuning point.
3. The antenna assembly according to claim 1, characterized in that: The resonant current generated by the first resonant mode on the antenna radiator between the ground end and the first tuning point is evenly distributed.
4. The antenna assembly according to claim 1, characterized in that: The first resonant mode has a first resonant current generated on the first tuning circuit and a second resonant current generated on the antenna radiator between the ground end and the first tuning point, and the flow direction of the first resonant current is the same as the flow direction of the second resonant current.
5. The antenna assembly according to claim 1, characterized in that: The equivalent resonant circuit corresponding to the first resonant mode is an LC series resonant circuit formed by the antenna radiator and the first tuning circuit between the ground end and the first tuning point.
6. The antenna assembly according to claim 1, characterized in that: The first tuning point coincides with the feeding point, the first tuning circuit includes a first sub-tuning circuit and a second sub-tuning circuit, the first sub-tuning circuit is electrically connected between the feeding point and the feed source, one end of the second sub-tuning circuit is electrically connected between the feed source and the first tuning circuit, the other end of the second sub-tuning circuit is grounded, the first sub-tuning circuit is capacitive, and / or the second sub-tuning circuit is capacitive, the first sub-tuning circuit, the second sub-tuning circuit and the antenna radiator between the ground end and the feeding point are used to generate the first resonant mode under the excitation of the feed source.
7. The antenna assembly according to claim 6, characterized in that: The first sub-tuning circuit includes at least one capacitor, and the second sub-tuning circuit includes at least one inductor or at least one capacitor.
8. The antenna assembly according to claim 6, characterized in that: The first sub-tuning circuit includes at least one inductor, and the second sub-tuning circuit includes at least one capacitor.
9. The antenna assembly according to any one of claims 1 to 8, characterized in that: The antenna radiator between the ground end and the free end is used to generate a second resonance mode supporting a second frequency band under the excitation of the feed source, and the center frequency point of the second frequency band is higher than the center frequency point of the first frequency band.
10. The antenna assembly according to claim 9, characterized in that: The length of the antenna radiator is equal to 1 / 4 wavelength of the second frequency band, and the second resonance mode is a 1 / 4 wavelength mode supporting the second frequency band.
11. The antenna assembly according to claim 9, characterized in that: The length of the antenna radiator is greater than or less than 1 / 4 wavelength of the second frequency band. The antenna radiator also includes a second tuning point arranged between the ground end and the free end. The antenna assembly also includes a second tuning circuit, which is electrically connected to the second tuning point. The second tuning circuit is used to tune the second resonant mode so that the second resonant mode is a 1 / 4 wavelength mode supporting the second frequency band.
12. The antenna assembly according to claim 11, characterized in that: The antenna assembly also includes a switching switch, which electrically connects the first tuning point, the second tuning point, the first tuning circuit and the second tuning circuit. The switching switch switches between the first tuning circuit and the second tuning circuit to make one of the first tuning circuit and the second tuning circuit conductive to the antenna radiator.
13. The antenna assembly according to claim 11, characterized in that: The second tuning point coincides with the feeding point, and the second tuning circuit includes a third sub-tuning circuit and a fourth sub-tuning circuit, the third sub-tuning circuit is electrically connected between the feeding point and the feed source, one end of the fourth sub-tuning circuit is electrically connected between the feeding point and the third tuning circuit, and the other end of the fourth sub-tuning circuit is grounded.
14. The antenna assembly according to claim 13, characterized in that: The first frequency band is the GPS-L5 frequency band, and the second frequency band is the GPS-L1 frequency band.
15. An electronic device, characterized in that: It comprises a circuit board, a frame and the antenna assembly according to any one of claims 1 to 14, wherein the feed source and the first tuning circuit are arranged on the circuit board, and the antenna radiator is arranged on the frame.
16. The electronic device according to claim 15, characterized in that: The frame includes a holding area, and at least a portion of the antenna radiator between the ground end and the first tuning point is arranged in the holding area and is used to form a dielectric loading for the first resonance mode in a holding scenario.
17. The electronic device according to claim 16, characterized in that: The efficiency of the first resonance mode after the medium is loaded is greater than the efficiency of the first resonance mode in a free scenario.