Antenna structure and electronic equipment

Abstract

The invention discloses an antenna structure and electronic equipment, and belongs to the technical field of electronic equipment. The antenna structure comprises a first antenna radiator, a second antenna radiator and a third antenna radiator which are arranged in sequence, wherein a first breaking joint is arranged between the first antenna radiator and the second antenna radiator, and a second breaking joint is arranged between the second antenna radiator and the third antenna radiator; the first antenna radiator is connected with a radio frequency end through a feeding point; the adjacent antenna radiators are bridged through a tuning circuit or coupled through a coupling piece; and the first antenna radiator, the second antenna radiator and the third antenna radiator are all grounded.

Description

Technical Field

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

[0002] With the advancement of modern communications technology, the performance, functionality, and integration of terminal devices (mobile terminals, tablets, wearable devices, etc.) are constantly improving to meet the increasingly diverse and varied usage scenarios and user needs. The performance of metal frame antennas currently widely used in mobile terminals is generally limited by the high integration and extreme design of the devices. At the same time, with the continuous development of fifth-generation (5G) mobile communications technology, the number of antennas included in terminal devices is also increasing to meet the ever-expanding communication frequency range and increasingly diverse user scenarios.

[0003] Existing antenna solutions often improve the performance of mid- and high-frequency antennas by adding additional parasitic radiating branches. In this case, the energy from the main radiating branches of the antenna must be transferred to the parasitic radiating branches through slot coupling, making it difficult to excite currents in the parasitic radiating branches with the same intensity and direction as the main radiating branches. While the existing metal frame antenna structure implemented in mobile terminals can improve the efficiency of mid- and high-frequency antennas in mobile terminals, it causes performance fluctuations and degradation in certain frequency bands (for example, the B41 and N41 bands). Summary of the Invention

[0004] The embodiments of the present application provide an antenna structure and an electronic device to improve the performance of the antenna frequency band.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides an antenna structure, including:

[0007] A first antenna radiator, a second antenna radiator, and a third antenna radiator are arranged in sequence;

[0008] Among them, there is a first break between the first antenna radiator and the second antenna radiator, and a second break between the second antenna radiator and the third antenna radiator; the first antenna radiator is connected to the RF end through a feeding point; adjacent antenna radiators are bridged by a tuning circuit or coupled by a coupling element; the first antenna radiator, the second antenna radiator and the third antenna radiator are all grounded.

[0009] Optionally, a first return point is provided on the second antenna radiator, and the first return point is located at an end of the second antenna radiator close to the first slit; or,

[0010] A first return point is provided between the first jumper point and the first tuning circuit. The first tuning circuit is connected between the first antenna radiator and the second antenna radiator. The first tuning circuit is connected to the second antenna radiator through the first jumper point and to the first antenna radiator through the first connection point.

[0011] Optionally, the first connection point and the feeding point are independently provided or the first connection point is the same as the feeding point.

[0012] Optionally, the second antenna radiator is coupled to the first antenna radiator via a first coupling member;

[0013] Part of the coupling element close to the first end of the first coupling element is projected onto the second antenna radiator; or the first end of the first coupling element is connected to an end of the second antenna radiator close to the first slit;

[0014] The second end of the first coupling element is connected to the first tuning circuit.

[0015] Optionally, the first return point is set on the second antenna radiator, and the first connection point and the feeding point are set independently, and a first electrostatic release device is provided between the first tuning circuit and the first antenna radiator.

[0016] Optionally, a second tuning circuit is connected between the second antenna radiator and the third antenna radiator.

[0017] Optionally, a second electrostatic discharge device is provided between the second tuning circuit and the second antenna radiator; and / or

[0018] A third electrostatic discharge device is provided between the second tuning circuit and the third antenna radiator.

[0019] Optionally, the second antenna radiator is connected to the third antenna radiator via a second coupling member;

[0020] Part of the coupling element of the second coupling element is projected onto the second antenna radiator, and part of the coupling element of the second coupling element is projected onto the third antenna radiator; or,

[0021] The first end of the second coupling element is connected to an end of the second antenna radiator close to the second slit, and a portion of the coupling element close to the second end of the second coupling element is projected onto the third antenna radiator; or

[0022] The second end of the second coupling element is connected to an end of the third antenna radiator close to the second slit, and a portion of the coupling element close to the first end of the second coupling element is projected onto the second antenna radiator.

[0023] Optionally, the current distribution directions of the first antenna radiator, the second antenna radiator, and the third antenna radiator are the same.

[0024] In a second aspect, an embodiment of the present application provides an electronic device, comprising a radio frequency end and the above-mentioned antenna structure;

[0025] The first antenna radiator of the antenna structure is connected to the radio frequency end.

[0026] In the embodiment of the present application, a three-segment antenna radiator structure is provided, and each antenna radiator is grounded, so that the performance of the antenna frequency band can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the basic structure of a known three-section medium-high frequency metal frame antenna;

[0028] Figure 2 This is a schematic diagram of the implementation structure of a known three-section medium-high frequency metal frame antenna in a mobile terminal;

[0029] Figure 3 This is a schematic diagram of the field distribution of the antenna radiator of a known three-section medium-high frequency metal frame antenna at 2.6GHz;

[0030] Figure 4 This is a schematic diagram of the total efficiency curve of the known three-segment metal frame antenna in the medium and high frequency bands (B3 / B39 / B1 / B40 / B41);

[0031] Figure 5 This is a schematic diagram of the radiation efficiency, system radiation efficiency, and system total efficiency curves of a known three-section metal frame antenna in the B41 frequency band;

[0032] Figure 6 This is one of the antenna structure diagrams of the embodiment of the present application;

[0033] Figure 7 This is the second schematic diagram of the antenna structure of the embodiment of the present application;

[0034] Figure 8 This is one of the schematic diagrams of the implementation structure of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application;

[0035] Figure 9 2.6 GHz is a schematic diagram of the field distribution of the antenna radiator of the embodiment of the present application;

[0036] Figure 10 2.2-3.0 GHz is a schematic diagram showing a comparison curve of the radiation efficiency of the medium-high frequency antenna of the embodiment of the present application and the known three-section medium-high frequency metal frame antenna;

[0037] Figure 11 Schematic diagram comparing the radiation pattern, principle, and current distribution of the three-section medium-high frequency metal frame antenna included in the embodiment of the present application and the known three-section medium-high frequency metal frame antenna;

[0038] Figure 12 This is a schematic diagram of the total efficiency curve of the three-section metal frame antenna in the medium and high frequency bands (B3 / B39 / B1 / B40 / B41);

[0039] Figure 13 It is a schematic diagram of the radiation efficiency, system radiation efficiency, and system total efficiency curves of the metal frame antenna;

[0040] Figure 14 This is the third antenna structure diagram of the embodiment of the present application;

[0041] Figure 15 This is the second schematic diagram of the implementation structure of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application;

[0042] Figure 16 This is the fourth antenna structure diagram of the embodiment of the present application;

[0043] Figure 17 This is the third schematic diagram of the implementation structure of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application;

[0044] Figure 18 This is the fifth antenna structure diagram of the embodiment of the present application;

[0045] Figure 19 This is the fourth implementation structural diagram of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application;

[0046] Figure 20 This is the sixth antenna structure diagram of the embodiment of the present application;

[0047] Figure 21 This is the fifth implementation structure diagram of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application;

[0048] Figure 22 is one of the schematic diagrams of an electrostatic discharge (ESD) device in the antenna structure of an embodiment of the present application;

[0049] Figure 23 This is a second schematic diagram of an electrostatic discharge device in the antenna structure of an embodiment of the present application;

[0050] Figure 24 This is a third schematic diagram of an electrostatic discharge device in the antenna structure of an embodiment of the present application;

[0051] Figure 25 This is the fourth schematic diagram of the electrostatic discharge device in the antenna structure of an embodiment of the present application. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0053] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0054] The prior art related to this application is described below.

[0055] Low-band communications (B28 / B5 / B8) operate only in the 700-960MHz range. Their signals are less susceptible to environmental influences, offering superior transmission capabilities and wide coverage, providing essential communication support for specific mobile terminal use cases (remote areas, complex environments, and emergency communications). Mid- and high-band communications (B3 / B39 / B1 / B40 / B41), on the other hand, operate in the 1700-2700MHz range. As the primary communication frequency band in urban areas, they offer superior bandwidth and coverage. Generally speaking, mid- and high-band antennas in mobile terminals are more susceptible to the surrounding environment (clearance), and their radiation performance is more dependent on the antenna radiator itself rather than the overall device floor.

[0056] The medium and high frequency metal frame antennas commonly used in mobile terminals usually adopt a two-segment antenna radiator structure. Although the main radiating branches and parasitic radiating branches participate in radiation together, the energy coupled to the parasitic radiating branches through the gap is limited. Therefore, the parasitic radiating branches are often not fully excited, and the antenna's radiation aperture (radiator size) is not fully utilized. Therefore, it is difficult to significantly improve the free space (FS) efficiency of the medium and high frequency antennas.

[0057] like Figure 1As shown, the basic structure of the medium and high frequency metal frame antenna in the related art mainly includes:

[0058] The metal frame 22 is provided with a first antenna radiator 11, a second antenna radiator 12, and a third antenna radiator 13;

[0059] A first slit 14 is provided between the first antenna radiator 11 and the second antenna radiator 12, and a second slit 15 is provided between the second antenna radiator 12 and the third antenna radiator 13; a first tuning circuit 18 is bridged across the first slit 14, and a second tuning circuit 19 is bridged across the second slit 15. The end of the first antenna radiator 11 (the first return point 16) is returned to the ground through a physical connection or through a PCB, and the end of the third antenna radiator 13 (with a second return point 17) is returned to the ground through a physical connection or through a PCB.

[0060] Compared with the traditional IFA (Inverted-F Antenna) antenna scheme (single radiator scheme) or the common two-segment antenna radiator scheme, by introducing multiple antenna radiators (first antenna radiator, second antenna radiator, third antenna radiator) and setting a corresponding tuning circuit between two adjacent radiators (at the gap), the conduction of the corresponding lumped element is controlled by the switching device, which not only can adjust the operating frequency of the antenna, but also can simultaneously excite currents with equivalent intensity and the same direction on the main radiating branch and the parasitic radiating branch, effectively utilizing the radiation aperture of the antenna, improving the uniformity of the field distribution of the medium and high frequency antenna radiator, and further improving the medium and high frequency performance of the antenna.

[0061] The implementation structure of the known three-section medium and high frequency metal frame antenna in the mobile terminal is further as follows Figure 2 As shown. The first antenna radiator serves as the main radiating branch, and its length is L1. The end of the first antenna radiator (the first return point) is connected to the ground through a physical connection material or a printed circuit board (PCB) through a spring 25. The radio frequency end (RF) is connected to the feeding point 24 on the first antenna radiator through the spring. Optionally, in one case, no matching circuit is set between the RF end and the feeding point. In another case, a matching circuit 20 is set between the RF end and the feeding point (wherein Figure 1 and Figure 2 The figure takes the example of setting a matching circuit 20 between the RF end and the feeding point. The matching circuit 20 is usually placed in the PCB area between the RF and the spring, which can adjust the impedance matching of the antenna itself, further reduce the matching loss of the antenna, and improve the performance of the antenna.

[0062] The second and third antenna radiators serve as parasitic radiating branches, with lengths of L2 and L3, respectively. The end of the third antenna radiator (the second return point) is grounded via a physical connection or a PCB ground connection via a spring clip. A first tuning circuit is connected across the first gap between the first and second antenna radiators. Specifically, a jumper point 26 is provided on each of the first and second antenna radiators. The first tuning circuit is connected to jumpers 26 on the first and second antenna radiators, respectively. Switching devices can be used to control the conduction of corresponding lumped elements, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the jumper tuning circuit can exhibit different states, such as short circuit, open circuit, capacitive, or inductive. This is not specifically limited here, but it should be noted that optimal antenna performance can only be achieved when the current distribution of the first and second antenna radiators is consistent. A second tuning circuit is connected across the second gap between the second and third antenna radiators. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states such as short circuit, open circuit, capacitive, and inductive. No specific restrictions are made here, but it should be noted that only when the current distribution direction of the second and third antenna radiators is the same can better antenna performance be achieved. The structure of the spring connecting the metal frame and the PCB in this antenna solution can be replaced with different implementation methods such as physical connection or screw locking, without affecting the performance and radiation characteristics of the antenna.

[0063] As an example of using a three-section medium-high frequency metal frame antenna, follow the Figure 1 and Figure 2 When the position and structure shown are implemented in a mobile terminal, the field distribution of the antenna radiator at 2.6 GHz is as follows Figure 3 Compared to traditional single-antenna radiator solutions and common two-segment antenna radiator solutions, the three-segment medium- and high-frequency metal frame antenna not only has a larger radiation aperture, but also, due to the presence of a cross-tuning circuit at the gap, the antenna radiator is more fully excited and the field distribution is more uniform.

[0064] The total efficiency curve of the three-section metal frame antenna in the medium and high frequency bands (B3 / B39 / B1 / B40 / B41) is as follows Figure 4As shown. In addition, when the length of the first antenna radiator is 13.0mm, the length of the second antenna radiator is 13.2mm, and the length of the third antenna radiator is 12.0mm, the average efficiency of the corresponding frequency bands is shown in Table 1. Thanks to the larger antenna radiation aperture and better field distribution uniformity, the metal frame antenna solution has demonstrated good antenna performance throughout the entire mid- and high-frequency bands. However, the total efficiency curve of the antenna shows a clear downward trend in the total efficiency of the antenna within the B41 band (2.5-2.7GHz). The total efficiency of the antenna at the end of the B41 band (2.7GHz) is much lower than the total efficiency at the beginning of the B41 band (2.5GHz). When the size of the antenna radiator is fixed, the downward trend within the B41 band is difficult to optimize by adjusting the cross-connected tuning circuit or matching circuit, which ultimately affects the consistency of the B41 band and the antenna performance.

[0065] Table 1 Average efficiency of metal frame antenna in corresponding frequency bands

[0066] Free space (dB) B3 B39 B1 B40 B41 Freq(GHz) 1.71-1.88 1.88-1.92 1.92-2.17 2.3-2.4 2.5-2.7 Rad.Eff -0.79 -0.68 -0.58 -0.51 -1.40 Sys.Rad.Eff. -1.61 -1.24 -1.33 -1.00 -1.85 Sys.Tot.Eff. -2.08 -1.27 -1.57 -1.73 -2.31

[0067] To further illustrate the performance fluctuation and consistency risk of the known three-section medium-high frequency metal frame antenna solution in the B41 frequency band, the radiation efficiency (Rad.Eff.), system radiation efficiency (Sys.Rad.Eff.) and system total efficiency (Sys.Tot.Eff.) curves of the metal frame antenna are shown as follows: Figure 5 As shown, the cross-connected tuning circuit has been adjusted to the state corresponding to the B41 frequency band. Radiation efficiency (Rad.Eff.) represents the antenna's radiation performance within the B41 frequency band, representing the optimal performance achievable by the antenna radiator under ideal conditions, ignoring matching and component losses. Comparing different efficiency curves reveals that the metal frame antenna's declining performance within the B41 frequency band is due to the antenna solution itself; optimizing the antenna matching and tuning circuits cannot change the location of the efficiency decline. Table 2 shows the efficiency differences within the B41 frequency band for this metal frame antenna.

[0068] Table 2 Efficiency difference of metal frame antenna in B41 frequency band

[0069] B41(dB) 2496MHz 2690MHz Difference Rad.Eff -0.73 -2.53 1.80 Sys.Rad.Eff. -1.31 -2.97 1.66 Sys.Tot.Eff. -1.38 -4.15 2.77

[0070] When the metal frame antenna solution is in accordance with Figure 1 and Figure 2When the position and structure shown are implemented in a mobile terminal, it is often necessary to optimize and adjust the size of the antenna radiator to push the falling edge of the antenna radiation efficiency as high as possible, and eventually move it out of the B41 frequency band. However, since the antenna in the bottom area of ​​the mobile terminal is subject to many restrictions on its internal device stacking and appearance design, the size of the antenna radiator can usually only be fine-tuned within a fixed range. For example, the position and size of the SIM card tray at the bottom of the entire device determine the minimum length of the first antenna radiator, the position of the fracture at the bottom of the entire device and the size of the USB interface determine the length of the second antenna radiator, and the size of the sound cavity at the bottom of the entire device determines the maximum length of the third antenna radiator. Therefore, although the known three-section medium and high frequency metal frame antenna can effectively utilize the antenna's radiation aperture to improve antenna performance by fully exciting the antenna radiator's unidirectional current and uniform field distribution characteristics, in actual situations, it is difficult to solve the performance fluctuation and degradation of this antenna solution within the B41 frequency band.

[0071] The antenna structure and electronic device provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0072] like Figure 1 As shown, an embodiment of the present application provides an antenna structure, including:

[0073] A first antenna radiator 100, a second antenna radiator 200 and a third antenna radiator 300 are arranged in sequence;

[0074] Among them, there is a first break 101 between the first antenna radiator 100 and the second antenna radiator 200, and a second break 102 between the second antenna radiator 200 and the third antenna radiator 300; the first antenna radiator 100 is connected to the RF end 500 through the feeding point 120; adjacent antenna radiators are bridged by a tuning circuit or coupled by a coupling element; the first antenna radiator 100, the second antenna radiator 200 and the third antenna radiator 300 are all grounded.

[0075] It should be noted that the embodiment of the present application, by setting up a three-section antenna radiator structure, and each antenna radiator is grounded, can improve the performance of the antenna frequency band, especially can solve the performance fluctuation and decline of the antenna in the B41 frequency band, and improve the performance of the antenna in the B41 frequency band.

[0076] Optionally, a matching circuit may be provided between the feeding point 120 and the RF end 500 to adjust the impedance matching of the antenna itself, thereby further reducing the matching loss of the antenna and improving the performance of the antenna.

[0077] Alternatively, as Figure 7As shown, a first antenna radiator 100, a second antenna radiator 200 and a third antenna radiator 300 are sequentially arranged on the metal frame 600. A second return point 110 is arranged on the first antenna radiator 100, and the first antenna radiator 100 is grounded through the second return point 110. A third return point 310 is arranged on the third antenna radiator 300, and the third antenna radiator 300 is grounded through the third return point 310.

[0078] Optionally, a first return point 210 is provided on the second antenna radiator 200, and the first return point 210 is located at an end of the second antenna radiator 200 close to the first slit 101; or,

[0079] A first return point 210 is provided between the first jumper point 220 and the first tuning circuit 103. The first tuning circuit 103 is connected between the first antenna radiator 100 and the second antenna radiator 200. The first tuning circuit 103 is connected to the second antenna radiator 200 through the first jumper point 220 and to the first antenna radiator 100 through the first connection point 130.

[0080] It should be noted that the first return point 210 is located at the end of the second antenna radiator 200 close to the first slit 101 , which can be understood as the first return point 210 should be as close to the first slit 101 as possible.

[0081] Optionally, in this case, the first jump point 220 is set at the end of the second antenna radiator 200 close to the first slit 101. If the first return point 210 is set on the second antenna radiator 200, the first return point 210 should be very close to or completely overlap with the first jump point.

[0082] Optionally, Figure 7 The example in which the first return point 210 is set on the second antenna radiator 200 is taken; compared with the traditional IFA antenna solution (single radiator solution) or the common two-segment antenna radiator solution, by introducing multiple antenna radiators (first antenna radiator, second antenna radiator, third antenna radiator) and setting a corresponding tuning circuit between two adjacent radiators (at the break), the corresponding lumped element (for example, the lumped element can also be a capacitor, inductor, etc.) is controlled by the switching device. Not only can the operating frequency of the antenna be adjusted, but also the current with the same intensity and direction can be excited simultaneously on the main radiating branch and the parasitic radiating branch, which effectively utilizes the radiation aperture of the antenna, improves the uniformity of the field distribution of the medium and high frequency antenna radiator, and further improves the medium and high frequency performance of the antenna. In addition, compared with the following examples, Figure 1The three-section medium and high frequency metal frame antenna shown in the embodiment of the present application has a second return point, a first return point and a third return point respectively on the first antenna radiator, the second antenna radiator and the third antenna radiator, which solves the defects of antenna performance fluctuation and decline in the B41 frequency band while ensuring the performance of the medium and high frequency antenna.

[0083] Further, if Figure 8As shown, the first antenna radiator 100 serves as the main radiating branch and has a length of L1. The end of the first antenna radiator 100 (the second return point 110) is connected to the ground through a physical connection or a PCB return point via a spring. The RF signal is connected to the feed point 120 on the first antenna radiator 100 via the spring. Optionally, when a matching circuit 400 is provided, the matching circuit 400 is typically placed in the PCB area between the RF end (RF) 500 and the spring. This can adjust the impedance matching of the antenna itself, further reducing the matching loss of the antenna and improving the performance of the antenna. The second antenna radiator 200 serves as a parasitic radiating branch and has a length of L2. One end of the second antenna radiator 200 (the first return point) is connected to the ground through a physical connection or a PCB return point via a spring. The location of the first return point should be as close to the fracture as possible. The third antenna radiator 300 serves as a parasitic radiating branch and has a length of L3. The end of the third antenna radiator 300 (third return point 310) is connected to the PCB ground via a physical connection or a spring clip 320. A first tuning circuit 103 is connected across the first gap 101 between the first antenna radiator 100 and the second antenna radiator 200. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states, such as short circuit, open circuit, capacitive, or inductive. This is not specifically limited here, but it should be noted that good antenna performance can only be achieved when the current distribution of the first antenna radiator 100 and the second antenna radiator 200 is the same. A second tuning circuit 104 is connected across the second gap 102 between the second antenna radiator 200 and the third antenna radiator 300. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states such as short circuit, open circuit, capacitive, or inductive. No specific limitations are given here, but it should be noted that only when the current distribution direction of the second antenna radiator 200 and the third antenna radiator 300 is the same can better antenna performance be achieved. The corresponding jumper point of the first tuning circuit 103 and the second tuning circuit 104 should be as close as possible to the gap to obtain a better tuning effect and range. Optionally, the structure of the spring connecting the metal frame and the PCB in the antenna structure can be replaced with different implementation methods such as physical connection or screw locking, without affecting the performance and radiation characteristics of the antenna.

[0084] As an example of the use of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application, according to Figure 7-Figure 8 When the position and structure shown are implemented in a mobile terminal, the field distribution of the antenna radiator at 2.6 GHz is as follows Figure 9Compared with the traditional single antenna radiator solution and the common two-segment antenna radiator solution, the three-segment medium and high frequency metal frame antenna structure not only has a larger radiation aperture, but also due to the presence of the cross-connected tuning circuit at the break, the antenna radiator is more fully excited and the field distribution is more uniform. In addition, compared with Figure 3 In the field distribution of the three-section medium-high frequency metal frame antenna shown, the second antenna radiator 200 has better field distribution uniformity and the difference between it and the third antenna radiator 300 is smaller.

[0085] As an example of the use of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application, according to Figure 7-Figure 8 When the position and structure shown are implemented in electronic equipment, the radiation efficiency of the medium and high frequency antenna at 2.2-3.0GHz is as follows Figure 10 As shown. For reference, the current three-section medium and high frequency metal frame antenna shows good radiation performance in the frequency band below 2.6GHz, and then shows a clear downward trend, and a radiation efficiency pit appears at around 2.8GHz. Therefore, even under the premise of good impedance matching, the total efficiency of the antenna at the end of the B41 frequency band (2.7GHz) will be lower than the total efficiency at the beginning of the B41 frequency band (2.5GHz). In contrast, the three-section medium and high frequency metal frame antenna included in the embodiment of the present application has no obvious fluctuation or decline in radiation efficiency in the frequency range of 2.2-3.0GHz when the radiator size and environment are the same.

[0086] In order to further illustrate the radiation pattern and principle of the three-section medium and high frequency metal frame antenna included in the embodiment of the present application, its current distribution is as follows Figure 11 As shown. At 2.6GHz, the three-section medium-high frequency metal frame antenna included in the embodiment of the present application and the current three-section medium-high frequency metal frame antenna show a similar current distribution, and the current distribution direction of the first antenna radiator 100, the second antenna radiator 200, and the third antenna radiator 300 are the same, that is, the current direction of the antenna radiator is consistent and uniform, and the radiation efficiency corresponding to the two antenna schemes is also basically the same. However, with the increase of the operating frequency, at 2.8GHz, the radiation pattern of the current three-section medium-high frequency metal frame antenna has changed significantly, and the middle of the second antenna radiator is used as the axis of symmetry, showing completely opposite current distributions on the left and right, corresponding to the pits in its radiation efficiency curve. In contrast, the three-section medium-high frequency metal frame antenna included in the embodiment of the present application shows the same radiation pattern and similar current distribution as 2.6GHz at 2.8GHz, so it can obtain stable antenna performance in the entire B41 frequency band.

[0087] As a design example of the three-section medium and high frequency metal frame antenna structure included in the embodiment of the present application, the total efficiency curve of the three-section metal frame antenna in the medium and high frequency bands (B3 / B39 / B1 / B40 / B41) is as follows: Figure 12 As shown in Table 3, when the length of the first antenna radiator is 13.0 mm, the length of the second antenna radiator is 13.2 mm, and the length of the third antenna radiator is 12.0 mm, the average efficiency of the corresponding frequency band is shown in Table 3. Figure 4 and Table 1), under the condition that the antenna radiator size and environment are the same, the three-section medium and high frequency metal frame antenna included in this application not only shows good antenna performance in the entire medium and high frequency bands, but also the total antenna efficiency in the B41 band is stable, with no obvious downward trend.

[0088] Table 3 Average efficiency of the metal frame antenna structure corresponding to the frequency band of the embodiment of the present application

[0089] Free space (dB) B3 B39 B1 B40 B41 Freq(GHz) 1.71-1.88 1.88-1.92 1.92-2.17 2.3-2.4 2.5-2.7 Rad.Eff -1.04 -0.98 -0.92 -0.93 -0.91 Sys.Rad.Eff. -2.01 -2.02 -1.53 -1.54 -1.50 Sys.Tot.Eff. -2.71 -2.16 -2.40 -1.83 -2.14

[0090] The radiation efficiency, system radiation efficiency and system total efficiency curves of the three-section medium-high frequency metal frame antenna included in the embodiment of the present application in the B41 frequency band are as follows: Figure 13 As shown, the cross-connected tuning circuit has been adjusted to the state corresponding to the B41 frequency band. It can be seen from the radiation efficiency curve that the three-section medium and high frequency metal frame antenna solution included in the embodiment of the present application shows excellent flatness in the entire medium and high frequency bands, fundamentally solving the performance fluctuation and consistency risks of the current three-section medium and high frequency metal frame antenna solution in the B41 frequency band. The efficiency difference of the three-section medium and high frequency metal frame antenna included in the embodiment of the present application at the initial end (2.5GHz) and the end end (2.7GHz) of the B41 frequency band is shown in Table 4.

[0091] Table 4 Efficiency difference of the metal frame antenna structure in the B41 frequency band of the embodiment of the present application

[0092] B41(dB) 2496MHz 2690MHz Difference Rad.Eff -0.96 -0.89 0.07 Sys.Rad.Eff. -1.55 -1.56 0.01 Sys.Tot.Eff. -2.31 -2.52 0.21

[0093] It should be noted that through the above Figure 7-Figure 8 The setting of the first point 210 in the circuit fundamentally solves the performance fluctuation and consistency risks of known antenna solutions in the B41 frequency band without affecting the mid- and high-frequency performance of the antenna, and effectively improves the bandwidth of the mid- and high-frequency antenna.

[0094] Optionally, Figure 14In the example, the first return point 210 is set between the first jumper point 220 and the first tuning circuit 103; by introducing multiple antenna radiators (first antenna radiator, second antenna radiator, third antenna radiator) and setting a corresponding tuning circuit between two adjacent radiators (break), the conduction of the corresponding lumped element is controlled by the switching device, not only the operating frequency of the antenna can be adjusted, but also the current with equivalent intensity and the same direction can be excited on the main radiating branch and the parasitic radiating branch at the same time, which effectively utilizes the radiation aperture of the antenna, improves the uniformity of the field distribution of the medium and high frequency antenna radiator, and further improves the medium and high frequency performance of the antenna. The medium and high frequency metal frame antenna included in the embodiment of the present application is respectively provided with a second return point, a first return point and a third return point on the first antenna radiator, the second antenna radiator and the third antenna radiator, which solves the defects of antenna performance fluctuation and decline in the B41 frequency band while ensuring the performance of the medium and high frequency antenna. In addition, compared with the Figure 7 In the three-section medium and high frequency metal frame antenna structure shown, the second return point 110 corresponding to the second antenna radiator 200 is set between the first tuning circuit 103 and its corresponding first jumper point 220, rather than directly on the second antenna radiator 200.

[0095] Further, if Figure 15As shown, the first antenna radiator 100 serves as a main radiating branch and has a length of L1. The end of the first antenna radiator (second return point 110) is connected to the PCB ground via a physical connection or a spring clip. The RF signal is connected to the feed point 120 on the first antenna radiator 100 via the spring clip. The matching circuit 400 is typically placed in the PCB area between the RF terminal (RF) 500 and the spring clip. The second antenna radiator 200 serves as a parasitic radiating branch and has a length of L2. To further reduce the number of connection points and the space occupied by the antenna structure, the first return point 210 can be located at any position between the first tuning circuit 103 and its corresponding first jumper point 220, such as at the spring clip connecting the first tuning circuit 103 to the second antenna radiator 200 and directly connected to the PCB ground. The third antenna radiator 300 serves as a parasitic radiating branch and has a length of L3. The end of the third antenna radiator 300 (third return point 310) is connected to the PCB ground via a physical connection or a spring clip 320. A first tuning circuit 103 is connected across the first gap 101 between the first antenna radiator 100 and the second antenna radiator 200. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states such as short circuit, open circuit, capacitive, and inductive. No specific limitation is made here, but it should be noted that better antenna performance can only be obtained when the current distribution of the first antenna radiator 100 and the second antenna radiator 200 has the same direction. A second tuning circuit 104 is connected across the second gap 102 between the second antenna radiator 200 and the third antenna radiator 300. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states such as short circuit, open circuit, capacitive, or inductive. No specific limitations are given here, but it should be noted that only when the current distribution direction of the second antenna radiator 200 and the third antenna radiator 300 is the same can better antenna performance be achieved. The corresponding jumper point of the first tuning circuit 103 and the second tuning circuit 104 should be as close as possible to the gap to obtain a better tuning effect and range. Optionally, the structure of the spring connecting the metal frame and the PCB in the antenna structure can be replaced with different implementation methods such as physical connection or screw locking, without affecting the performance and radiation characteristics of the antenna.

[0096] Furthermore, through Figure 14-15 The setting method of the first return point 210 in the embodiment further reduces the space occupied by the antenna structure at the bottom of the entire device by setting the first return point 210 of the second antenna radiator 200 between the first tuning circuit 103 and its corresponding first jumper point 220, which is beneficial to the device layout of the USB interface.

[0097] Optionally, the first connection point 130 and the feeding point 120 are independently provided, or the first connection point 130 is the same as the feeding point 120 .

[0098] like Figure 7-Figure 8 、 Figure 14-15 As shown, one end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end of the first tuning circuit 103 is connected to the first antenna radiator through a first connection point 130, and the first connection point 130 is independently set from the feeding point 120.

[0099] like Figure 16 As shown, one end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 is the same as the feeding point 120, that is, in this case, the first connection point 130 is reused on the feeding point 120; by introducing multiple antenna radiators (first antenna radiator, second antenna radiator, third antenna radiator) and setting a corresponding tuning circuit between two adjacent radiators (at the break), the conduction of the corresponding lumped element is controlled by the switching device, not only the operating frequency of the antenna can be adjusted, but also currents with equivalent intensity and the same direction can be simultaneously excited on the main radiating branch and the parasitic radiating branch, thereby effectively utilizing the radiation aperture of the antenna, improving the uniformity of the field distribution of the medium and high frequency antenna radiator, and further improving the medium and high frequency performance of the antenna. The medium and high frequency metal frame antenna structure included in the embodiment of the present application is provided with a second return point, a first return point and a third return point on the first antenna radiator 100, the second antenna radiator 200 and the third antenna radiator 300 respectively, which solves the problem of antenna performance fluctuation and decline in the B41 frequency band while ensuring the performance of the medium and high frequency antenna. Figure 6 In the three-section medium-high frequency metal frame antenna shown, the first return point 210 corresponding to the second antenna radiator 200 is set between the first tuning circuit 103 and its corresponding first jumper point 220, rather than directly on the second antenna radiator 200. At the same time, the first connection point 130 of the first tuning circuit 103 coincides with the feeding point 120.

[0100] The implementation structure of the three-section medium and high frequency metal frame antenna included in the embodiment of the present application is as follows Figure 17As shown. The first antenna radiator 100 serves as a main radiating branch and has a length of L1. The end of the first antenna radiator 100 (the second return point 110) is connected to the ground via a physical connection or a PCB ground connection via a spring clip. The RF signal is connected to the feed point 120 on the first antenna radiator 100 via the spring clip. The matching circuit 400 is usually placed in the PCB area between the RF end (RF) 500 and the spring clip. The second antenna radiator 200 serves as a parasitic radiating branch and has a length of L2. To further reduce the number of connection points and the space occupied by the antenna structure, the first return point 210 can be set at any position between the first tuning circuit 103 and its corresponding first jumper point 220, such as at the spring clip where the first tuning circuit 103 connects to the second antenna radiator 200 and is directly grounded via the PCB. The third antenna radiator 300 serves as a parasitic radiating branch and has a length of L3. The end of the third antenna radiator 300 (the third return point 310) is connected to the ground via a physical connection or a PCB ground connection via a spring clip 320. A first tuning circuit 103 is connected across the first gap 101 between the first antenna radiator 100 and the second antenna radiator 200. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states such as short circuit, open circuit, capacitive, and inductive. No specific limitation is made here, but it should be noted that only when the current distribution direction of the first antenna radiator 100 and the second antenna radiator 200 is the same can better antenna performance be obtained. In order to further reduce the number of connection points and the space occupied by the antenna structure, compared with the following example, Figure 7 In the illustrated implementation of a three-segment, medium- and high-frequency metal frame antenna, the jumper point of the first tuning circuit 103 is located anywhere between the feed point 120 of the first antenna radiator 100 and its corresponding matching circuit 400, such as at the spring corresponding to the feed point 120, and is connected to the first tuning circuit 103 via a PCB trace. A second tuning circuit 104 is connected across the second gap 102 between the second antenna radiator 200 and the third antenna radiator 300. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the antenna's operating frequency. Depending on the size of the antenna radiator and the operating frequency, the jumper tuning circuit can assume various states, such as short circuit, open circuit, capacitive, or inductive. This is not specifically limited here, but it should be noted that optimal antenna performance is achieved only when the current distributions of the second antenna radiator 200 and the third antenna radiator 300 are aligned. The jumper point corresponding to the first tuning circuit 103 and the second tuning circuit 104 should be as close as possible to the gap to achieve better tuning effect and range. The structure in which the springs in the antenna structure connect the metal frame and the PCB can be replaced by different implementation methods such as physical connection or locking screws, without affecting the performance and radiation characteristics of the antenna.

[0101] It should be noted that Figure 16 and Figure 17 The antenna structure shown further reduces the space occupied by the antenna solution at the bottom of the entire device by setting the second return point 110 of the second antenna radiator 200 between the first tuning circuit 103 and its corresponding first jumper point 220, which is beneficial to the device layout of the USB interface; by aligning the first connection point 130 of the first tuning circuit 103 with the feed point 120, the number of connection points required for the antenna structure is further reduced. Without affecting the antenna performance and radiation characteristics, the implementation structure of the antenna solution is optimized and the cost is reduced.

[0102] Alternatively, as Figure 16 As shown, in one implementation, a second tuning circuit 104 is connected across the second antenna radiator 200 and the third antenna radiator 300 .

[0103] Alternatively, as Figure 18 As shown, in another implementation, the second antenna radiator 200 is connected to the third antenna radiator 300 through a second coupling member 105;

[0104] Specifically, the second coupling member 105 can be implemented in one of the following configurations:

[0105] Configuration mode 1: Part of the second coupling element 105 is projected onto the second antenna radiator 200 , and part of the second coupling element 105 is projected onto the third antenna radiator 300 ;

[0106] This situation can be understood as the second coupling element 105 is not connected to the second antenna radiator 200 and the third antenna radiator 300, but is coupled through the coupling amount generated by the overlapping area with the second antenna radiator 200 and the third antenna radiator 300 respectively.

[0107] Configuration mode 2: The first end of the second coupling element 105 is connected to the end of the second antenna radiator 200 close to the second slit 102 , and a portion of the coupling element close to the second end of the second coupling element 105 is projected onto the third antenna radiator 300 .

[0108] This situation can be understood as the second coupling element 105 being connected to the second antenna radiator 200 . At this time, the second coupling element 105 and the second antenna radiator 200 are integrated as a whole, so that the second antenna radiator 200 is coupled to the third antenna radiator 300 .

[0109] Configuration mode three: the second end of the second coupling element 105 is connected to the end of the third antenna radiator 300 close to the second slit 102 , and a portion of the coupling element close to the first end of the second coupling element 105 is projected onto the second antenna radiator 200 ;

[0110] This situation can be understood as the second coupling element 105 being connected to the third antenna radiator 300 . At this time, the second coupling element 105 and the third antenna radiator 300 are considered as a whole, so that the third antenna radiator 300 is coupled to the second antenna radiator 200 .

[0111] For example, taking the connection between the second coupling element 105 and the second antenna radiator 200 as an example, Figure 18 As shown, by introducing multiple antenna radiators (first antenna radiator, second antenna radiator, third antenna radiator) and setting corresponding tuning circuits or coupling components between two adjacent radiators (at the gap), the conduction of the corresponding lumped elements is controlled by the switching device, which can not only adjust the operating frequency of the antenna, but also simultaneously excite currents of comparable intensity and the same direction on the main radiating branches and the parasitic radiating branches, effectively utilizing the radiation aperture of the antenna, improving the uniformity of the field distribution of the medium and high frequency antenna radiators, and further improving the medium and high frequency performance of the antenna. The medium and high frequency metal frame antenna included in the embodiment of the present application is provided with a second return point, a first return point and a third return point on the first antenna radiator 100, the second antenna radiator 200 and the third antenna radiator 300, respectively, which solves the defects of antenna performance fluctuation and decline in the B41 frequency band while ensuring the performance of the medium and high frequency antenna. Compared with the above embodiments, Figure 6 In the illustrated three-segment mid-high frequency metal frame antenna structure, the first return point 210 corresponding to the second antenna radiator 200 is located between the first tuning circuit 103 and its corresponding first jumper point 220, rather than directly on the second antenna radiator 200. Furthermore, the first connection point 130 of the first tuning circuit 103 coincides with the feed point 120. Furthermore, a corresponding second coupling element 105 is provided at the second slit 102, rather than across the second tuning circuit 104.

[0112] Furthermore, the implementation structure of the three-section medium and high frequency metal frame antenna included in the embodiment of the present application is as follows Figure 19As shown. The first antenna radiator 100 serves as a main radiating branch, and its length is L1. The end of the first antenna radiator (the second return point 110) is connected to the ground through a physical connection or a PCB return point through a spring. The RF signal is connected to the feed point 120 on the first antenna radiator 100 through the spring. The matching circuit 400 is usually placed in the PCB area between the RF end (RF) 500 and the spring. The second antenna radiator 200 serves as a parasitic radiating branch, and its length is L2. In order to further reduce the number of connection points and the space occupied by the antenna structure, the first return point 210 can be set at any position between the first tuning circuit 103 and its corresponding first jumper point 220, for example, at the spring where the first tuning circuit 103 is connected to the second antenna radiator 200 and directly returned to the ground through the PCB. The third antenna radiator 300 serves as a parasitic radiating branch, and its length is L3. The end of the third antenna radiator (the third return point 310) is connected to the ground through a physical connection or a PCB return point through a spring. A first tuning circuit 103 is connected across the first gap 101 between the first antenna radiator 100 and the second antenna radiator 200. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. Depending on the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states such as short circuit, open circuit, capacitive, and inductive. No specific limitation is made here, but it should be noted that only when the current distribution direction of the first antenna radiator 100 and the second antenna radiator 200 is the same can better antenna performance be obtained. In order to further reduce the number of connection points and the space occupied by the antenna structure, compared with the following example, Figure 7 In the implementation structure of the three-section medium-high frequency metal frame antenna shown in FIG, the jumper point of the first tuning circuit 103 is set at any position between the feeding point 120 of the first antenna radiator 100 and the corresponding matching circuit 400, such as the spring corresponding to the feeding point 120 and connected to the first tuning circuit 103 through a PCB trace. A second coupling member 105 is provided at the second slit 102 between the second antenna radiator 200 and the third antenna radiator 300. The second coupling member 105 is connected to the second antenna radiator 200 and has a length of L4. Figure 7 The illustrated implementation of a three-segment, mid- and high-frequency metal frame antenna further reduces the number of connection points and the amount of tuning circuitry (switches and lumped elements) required within the antenna structure. By optimizing the second coupling element, the third antenna radiator can achieve the same current distribution as the second antenna radiator, thereby achieving better antenna performance. The spring-loaded structure connecting the metal frame and PCB in this antenna structure can be replaced with various implementations, such as physical connections or screw-on screws, without affecting the performance and radiation characteristics of the resulting antenna.

[0113] It should be noted that this implementation method, by setting a second coupling member 105 at the second break 102 to replace the second tuning circuit 104, further reduces the space occupied by the antenna solution at the bottom of the entire machine and the PCB, which is beneficial to the layout of the devices (sound cavity) in the third antenna radiator 300 area.

[0114] Alternatively, as Figure 20 As shown, the second antenna radiator 200 is coupled to the first antenna radiator 100 through the first coupling element 106;

[0115] Part of the coupling element close to the first end of the first coupling element 106 is projected onto the second antenna radiator 200; or the first end of the first coupling element 106 is connected to an end of the second antenna radiator 200 close to the first slit 101;

[0116] The second end of the first coupling element 106 is connected to the first tuning circuit 103 .

[0117] It should be noted that this situation can be implemented in two ways: Implementation method 1, the first coupling element 106 is not connected to the second antenna radiator 200, and part of the coupling element of the first coupling element 106 is projected onto the second antenna radiator 200, and part of the coupling element of the first coupling element 106 is projected onto the first antenna radiator 100, and coupling is performed through the coupling amount generated by the overlapping area with the second antenna radiator 200 and the third antenna radiator 300 respectively, and one end of the first tuning circuit 103 is connected to the first coupling element 106; Implementation method 2, the first coupling element 106 is connected to the second antenna radiator 200, and part of the coupling element of the first coupling element 106 is projected onto the first antenna radiator 100. At this time, the first coupling element 106 and the second antenna radiator 200 are as a whole, so that the second antenna radiator 200 is coupled to the first antenna radiator 100, and one end of the first tuning circuit 103 is connected to the first coupling element 106.

[0118] For example, take the connection between the first coupling element 106 and the second antenna radiator 200 as an example. Figure 20As shown, by introducing multiple antenna radiators (first antenna radiator, second antenna radiator, third antenna radiator) and setting corresponding tuning circuits or coupling components between two adjacent radiators (at the gap), the conduction of the corresponding lumped elements is controlled by the switching device, which can not only adjust the operating frequency of the antenna, but also simultaneously excite currents of comparable intensity and the same direction on the main radiating branches and the parasitic radiating branches, effectively utilizing the radiation aperture of the antenna, improving the uniformity of the field distribution of the medium and high frequency antenna radiators, and further improving the medium and high frequency performance of the antenna. The medium and high frequency metal frame antenna included in the embodiment of the present application is provided with a second return point, a first return point and a third return point on the first antenna radiator 100, the second antenna radiator 200 and the third antenna radiator 300, respectively, which solves the defects of antenna performance fluctuation and decline in the B41 frequency band while ensuring the performance of the medium and high frequency antenna. Compared with the above embodiments, Figure 6 In the three-section medium-high frequency metal frame antenna structure shown, the first return point 210 corresponding to the second antenna radiator 200 is set between the first tuning circuit 103 and the first jumper point 220 corresponding thereto, rather than being directly set on the second antenna radiator 200. At the same time, the jumper point of the first tuning circuit 103 is set between the first antenna radiator 100 and the matching circuit 400 corresponding thereto, rather than being directly set on the first antenna radiator 100. In addition, a corresponding second coupling member 105 is provided at the second slit 102, rather than being connected across the second tuning circuit. The implementation structure of the three-section medium-high frequency metal frame antenna included in the embodiment of the present application is as follows: Figure 21As shown. The first antenna radiator 100 serves as the main radiating branch, and its length is L1. The end of the first antenna radiator 100 (the second return point 110) is connected to the ground through a physical connection or a PCB through a spring. The RF signal is connected to the feeding point 120 on the first antenna radiator 100 through the spring. Optionally, when a matching circuit 400 is provided, the matching circuit 400 is usually placed in the PCB area between the RF end (RF) 500 and the spring. The second antenna radiator 200 serves as a parasitic radiating branch, and its length is L2. In order to further reduce the number of connection points and the space occupied by the antenna structure, the first return point 210 can be set at any position between the first tuning circuit 103 and its corresponding first jumper point 220, for example, at the spring where the first tuning circuit 103 is connected to the second antenna radiator 200 and directly returned to the ground through the PCB. The third antenna radiator 300 serves as a parasitic radiation branch, and its length is L3. The end of the third antenna radiator 300 (the third return point 310) is connected to the ground through a physical connection or a PCB return point through a spring. The first tuning circuit 103 is connected across the first gap 101 between the first antenna radiator 100 and the second antenna radiator 200. A switching device can be used to control the conduction of the corresponding lumped element, thereby adjusting the operating frequency of the antenna. According to the size and operating frequency of the antenna radiator, the connected tuning circuit can be in different states such as short circuit, open circuit, capacitive, and inductive. No specific limitation is made here, but it should be noted that only when the current distribution direction of the first antenna radiator 100 and the second antenna radiator 200 is the same, can better antenna performance be obtained. In order to further reduce the number of connection points and the space occupied by the antenna structure, compared to the following examples: Figure 7 In the implementation structure of the three-section medium-high frequency metal frame antenna shown in FIG, the jumper point of the first tuning circuit 103 is set at any position between the feeding point 120 of the first antenna radiator 100 and the corresponding matching circuit 400, such as the spring corresponding to the feeding point 120 and connected to the first tuning circuit 103 through a PCB trace. A first coupling member is provided at the second slit 102 between the second antenna radiator 200 and the third antenna radiator 300, and its length is L4, relative to FIG. Figure 7The implementation structure of the three-section medium and high frequency metal frame antenna shown further reduces the number of connection points and the number of tuning circuits (switches and lumped elements) required for the antenna solution. By optimizing the second coupling member 105, the third antenna radiator 300 can form the same current distribution direction as the second antenna radiator 200, thereby obtaining better antenna performance. The structure in which the spring clip connects the metal frame and the PCB in the antenna structure can be replaced with different implementation methods such as physical connection or locking screws, which will not affect the performance and radiation characteristics of the antenna. A first coupling member 106 is provided at the first break 101 between the second antenna radiator 200 and the first antenna radiator 100, and its length is L5, relative to the following. Figure 7 In the implementation structure of the three-section medium and high frequency metal frame antenna shown in FIG, the first coupling element 106 can not only provide additional auxiliary tuning for the first tuning circuit 103, but also because the first coupling element 106 extends toward the first radiation branch, the distance between the first tuning circuit 103 and the corresponding jumper point is further shortened, thereby reducing the loss.

[0119] It should be noted that this implementation not only provides additional auxiliary tuning for the first tuning circuit 103 by disposing the first coupling member 106 at the first slit 101 , but also shortens the distance between the first tuning circuit 103 and the corresponding jumper point, thereby reducing loss.

[0120] In summary, the embodiments of the present application mainly have the following implementation situations in specific applications:

[0121] Case 1: The first return point 210 is disposed on the second antenna radiator 200 , and the first return point 210 is located at the end of the second antenna radiator 200 close to the first slit 101 .

[0122] Optionally, the antenna structure in the configuration of the first return point 210 can be implemented in the following ways:

[0123] Implementation method 1: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 and the feeding point 120 are independently provided. A second tuning circuit 104 is connected across the second slit 102.

[0124] It should be noted that, when the matching circuit 400 is provided, Figure 22As shown, in this case, a first electrostatic release device 810 is provided between the first tuning circuit 103 and the first antenna radiator 100, a second electrostatic release device 820 is provided between the second tuning circuit 104 and the second antenna radiator 200, a third electrostatic release device 830 is provided between the second tuning circuit 104 and the third antenna radiator 300, and a fourth electrostatic release device 840 is provided between the matching circuit 400 and the first antenna radiator 10. Under this antenna structure, the setting of the electrostatic release device between the first tuning circuit 103 and the second antenna radiator 200 can be reduced, thereby reducing the antenna cost.

[0125] Implementation method 2: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 is the same as the feeding point 120. A second tuning circuit 104 is connected across the second slit 102.

[0126] Implementation method three: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 and the feeding point 120 are independently provided. The second slit 102 is coupled via a second coupling element 105 (the second coupling element 105 is connected to the second antenna radiator 200 or the third antenna radiator 300).

[0127] Implementation method 4: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 is the same as the feeding point 120. The second slit 102 is coupled through a second coupling element 105 (the second coupling element 105 is connected to the second antenna radiator 200 or the third antenna radiator 300).

[0128] Implementation method five: The end of the second antenna radiator 200 close to the first slit 101 is connected to the first coupling member 106, one end of the first tuning circuit 103 is connected to the first coupling member 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 via a first connection point 130. The first connection point 130 and the feeding point 120 are provided independently. The second tuning circuit 104 is connected across the second slit 102.

[0129] Implementation method six: The second antenna radiator 200 is connected to a first coupling element 106 at one end close to the first slit 101, one end of the first tuning circuit 103 is connected to the first coupling element 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 via a first connection point 130. The first connection point 130 and the feeding point 120 are independently provided. The second slit 102 is coupled via a second coupling element 105 (the second coupling element 105 is connected to the second antenna radiator 200 or the third antenna radiator 300);

[0130] Implementation method seven: The end of the second antenna radiator 200 close to the first slit 101 is connected to the first coupling member 106, one end of the first tuning circuit 103 is connected to the first coupling member 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 via a first connection point 130. The first connection point 130 is the same as the feeding point 120. The second tuning circuit 104 is connected across the second slit 102.

[0131] Implementation method eight: The second antenna radiator 200 is connected to a first coupling member 106 at one end close to the first slit 101, one end of the first tuning circuit 103 is connected to the first coupling member 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 through a first connection point 130, the first connection point 130 is the same as the feeding point 120, and the second slit 102 is coupled through a second coupling member 105 (the second coupling member 105 is connected to the second antenna radiator 200 or the third antenna radiator 300).

[0132] Case 2: The first return point 210 is disposed between the first jumper point 220 and the first tuning circuit 103 .

[0133] Optionally, the antenna structure in the configuration of the first return point 210 can be implemented in the following ways:

[0134] Implementation method 1: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 and the feeding point 120 are independently provided. A second tuning circuit 104 is connected across the second slit 102.

[0135] Implementation method 2: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 is the same as the feeding point 120. A second tuning circuit 104 is connected across the second slit 102.

[0136] It should be noted that, when the matching circuit 400 is provided, Figure 23 As shown, in this case, a second electrostatic release device 820 is provided between the second tuning circuit 104 and the second antenna radiator 200, a third electrostatic release device 830 is provided between the second tuning circuit 104 and the third antenna radiator 300, and a fourth electrostatic release device 840 is provided between the matching circuit 400 and the first antenna radiator 10. Under this antenna structure, the setting of the electrostatic releaser between the first tuning circuit 103 and the second antenna radiator 200 and the setting of the electrostatic releaser between the first tuning circuit 103 and the first antenna radiator 100 can be reduced, thereby reducing the antenna cost.

[0137] Implementation method three: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 and the feeding point 120 are independently provided. The second slit 102 is coupled via a second coupling element 105 (the second coupling element 105 is connected to the second antenna radiator 200 or the third antenna radiator 300).

[0138] Implementation method 4: A first tuning circuit 103 is connected across the first slit 101. One end of the first tuning circuit 103 is connected to the second antenna radiator 200, and the other end is connected to the first antenna radiator 100 through a first connection point 130. The first connection point 130 is the same as the feeding point 120. The second slit 102 is coupled through a second coupling element 105 (the second coupling element 105 is connected to the second antenna radiator 200 or the third antenna radiator 300).

[0139] It should be noted that, when the matching circuit 400 is provided, Figure 24 As shown, in this case, a fourth electrostatic release device 840 is provided between the matching circuit 400 and the first antenna radiator 10. Under this antenna structure, the setting of the electrostatic releaser between the first tuning circuit 103 and the second antenna radiator 200 and the setting of the electrostatic releaser between the first tuning circuit 103 and the first antenna radiator 100 can be reduced, thereby reducing the antenna cost.

[0140] Implementation method five: The end of the second antenna radiator 200 close to the first slit 101 is connected to the first coupling member 106, one end of the first tuning circuit 103 is connected to the first coupling member 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 via a first connection point 130. The first connection point 130 and the feeding point 120 are provided independently. The second tuning circuit 104 is connected across the second slit 102.

[0141] Implementation method six: The second antenna radiator 200 is connected to a first coupling element 106 at one end close to the first slit 101, one end of the first tuning circuit 103 is connected to the first coupling element 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 via a first connection point 130. The first connection point 130 and the feeding point 120 are independently provided. The second slit 102 is coupled via a second coupling element 105 (the second coupling element 105 is connected to the second antenna radiator 200 or the third antenna radiator 300);

[0142] Implementation method seven: The end of the second antenna radiator 200 close to the first slit 101 is connected to the first coupling member 106, one end of the first tuning circuit 103 is connected to the first coupling member 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 via a first connection point 130. The first connection point 130 is the same as the feeding point 120. The second tuning circuit 104 is connected across the second slit 102.

[0143] Implementation method eight: The second antenna radiator 200 is connected to a first coupling element 106 at one end close to the first slit 101, one end of the first tuning circuit 103 is connected to the first coupling element 106, and the other end of the first tuning circuit 103 is connected to the first antenna radiator 100 via a first connection point 130. The first connection point 130 is the same as the feeding point 120. The second slit 102 is coupled via a second coupling element 105 (the second coupling element 105 is connected to the second antenna radiator 200 or the third antenna radiator 300);

[0144] It should be noted that, when the matching circuit 400 is provided, Figure 25 As shown, in this case, a fourth electrostatic release device 840 is provided between the matching circuit 400 and the first antenna radiator 10. Under this antenna structure, the setting of the electrostatic releaser between the first tuning circuit 103 and the second antenna radiator 200 and the setting of the electrostatic releaser between the first tuning circuit 103 and the first antenna radiator 100 can be reduced, thereby reducing the antenna cost.

[0145] It should be noted that the drawings of the embodiments of the present application all take the example of a matching circuit 400 between the feeding point and the RF end. Of course, the implementation method of not including a matching circuit between the feeding point and the RF end also falls within the protection scope of the embodiments of the present application.

[0146] It should be noted that the embodiments of the present application can achieve one or more of the following beneficial effects:

[0147] By using a three-segment antenna radiator and connecting corresponding tuning circuits and lumped elements between two adjacent radiators, the antenna's radiation aperture is effectively utilized, the unidirectional current of the antenna radiator is fully stimulated, the uniformity of the antenna radiator's field distribution is improved, and the antenna's mid- and high-frequency performance is effectively enhanced.

[0148] By setting the return point, the performance fluctuation and consistency risks of known antenna solutions in the B41 frequency band are fundamentally resolved without affecting the antenna's mid- and high-frequency performance, effectively improving the bandwidth of the mid- and high-frequency antenna.

[0149] By arranging the return point of the second antenna radiator between the first tuning circuit and its corresponding jumper point, the number of connection points required for the antenna structure can be further reduced. Without affecting the antenna performance and radiation characteristics, the antenna solution implementation structure is optimized and the cost is reduced.

[0150] Compared with the known antenna solutions, the corresponding ESD devices can be saved, thus reducing the cost;

[0151] By setting the return point of the second antenna radiator between the first tuning circuit and its corresponding jumper point, the space occupied by the antenna structure at the bottom of the entire device can be further reduced, which is beneficial to the layout of USB interface components.

[0152] By arranging the jumper point of the first tuning circuit between the feed point of the first antenna radiator and its corresponding matching circuit, the number of connection points required for the antenna solution is further reduced. Without affecting the antenna performance and radiation characteristics, the implementation structure of the antenna solution is optimized and the cost is reduced.

[0153] By providing a second coupling structure at the second fracture and replacing the second tuning circuit, the space occupied by the antenna structure on the bottom of the device and the PCB can be further reduced, which is beneficial to the layout of the components (sound cavity) in the third antenna radiator area.

[0154] By arranging the first coupling structure at the first fracture to replace the first tuning circuit, not only is additional auxiliary tuning provided for the first tuning circuit, but also the distance between the first tuning circuit and the corresponding cross-connection point is shortened, thereby reducing loss.

[0155] An embodiment of the present application further provides an electronic device, comprising a radio frequency end and the above-mentioned antenna structure;

[0156] The first antenna radiator of the antenna structure is connected to the radio frequency end.

[0157] It should be noted that the electronic device provided with the antenna structure can improve the antenna efficiency of the electronic device, reduce the cost of the electronic device, and improve the market competitiveness of the electronic device.

[0158] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. An antenna structure, characterized in that: include: A first antenna radiator (100), a second antenna radiator (200), and a third antenna radiator (300) are arranged in sequence; A first slit (101) is provided between the first antenna radiator (100) and the second antenna radiator (200), and a second slit (102) is provided between the second antenna radiator (200) and the third antenna radiator (300); the first antenna radiator (100) is connected to the radio frequency end (500) via a feeding point (120); adjacent antenna radiators are bridged via a tuning circuit or coupled via a coupling element; and the first antenna radiator (100), the second antenna radiator (200) and the third antenna radiator (300) are all grounded.

2. The antenna structure according to claim 1, wherein: A first return point (210) is provided on the second antenna radiator (200), and the first return point (210) is located at the end of the second antenna radiator (200) close to the first slit (101); or, A first return point (210) is provided between the first jumper point (220) and the first tuning circuit (103); the first tuning circuit (103) is bridged between the first antenna radiator (100) and the second antenna radiator (200); the first tuning circuit (103) is connected to the second antenna radiator (200) via the first jumper point (220) and is connected to the first antenna radiator (100) via the first connection point (130).

3. The antenna structure according to claim 2, characterized in that: The first connection point (130) and the feeding point (120) are independently provided, or the first connection point (130) and the feeding point (120) are the same.

4. The antenna structure according to claim 2 or 3, characterized in that: The second antenna radiator (200) is coupled to the first antenna radiator (100) via a first coupling element (106); Part of the coupling element close to the first end of the first coupling element (106) is projected onto the second antenna radiator (200); or the first end of the first coupling element (106) is connected to an end of the second antenna radiator (200) close to the first slit (101); The second end of the first coupling element (106) is connected to the first tuning circuit (103).

5. The antenna structure according to claim 3, characterized in that: The first return point (210) is arranged on the second antenna radiator (200), the first connection point (130) and the feeding point (120) are independently arranged, and a first electrostatic discharge device (810) is arranged between the first tuning circuit (103) and the first antenna radiator (100).

6. The antenna structure according to any one of claims 1 to 5, characterized in that: A second tuning circuit (104) is connected across the second antenna radiator (200) and the third antenna radiator (300).

7. The antenna structure according to claim 6, characterized in that: A second electrostatic discharge device (820) is provided between the second tuning circuit (104) and the second antenna radiator (200); and / or A third electrostatic discharge device (830) is provided between the second tuning circuit (104) and the third antenna radiator (300).

8. The antenna structure according to any one of claims 1 to 5, characterized in that: The second antenna radiator (200) is connected to the third antenna radiator (300) via a second coupling element (105); Part of the coupling element of the second coupling element (105) is projected onto the second antenna radiator (200), and part of the coupling element of the second coupling element (105) is projected onto the third antenna radiator (300); or, The first end of the second coupling element (105) is connected to an end of the second antenna radiator (200) close to the second slit (102), and a portion of the coupling element close to the second end of the second coupling element (105) is projected onto the third antenna radiator (300); or The second end of the second coupling member (105) is connected to an end of the third antenna radiator (300) close to the second slit (102), and a portion of the coupling member close to the first end of the second coupling member (105) is projected onto the second antenna radiator (200).

9. The antenna structure according to claim 1, wherein: The current distribution directions of the first antenna radiator (100), the second antenna radiator (200), and the third antenna radiator (300) are the same.

10. An electronic device, characterized in that: comprising a radio frequency end and the antenna structure according to any one of claims 1 to 9; The first antenna radiator of the antenna structure is connected to the radio frequency end.

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