Terminal antenna and electronic device

Abstract

The embodiment of the application discloses a terminal antenna and electronic equipment, and relates to the technical field of antennas; and the terminal antenna can provide better radiation performance in a poor environment. The terminal antenna comprises a first radiator, a first feed source arranged on the first radiator, and a first grounding point arranged at one end of the first radiator. The first grounding point is connected with the first radiator through a first inductor, and the value of the first inductor is included in the range of [5nH, 47nH].

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, and in particular to a terminal antenna and an electronic device. BACKGROUND

[0002] With the development of electronic devices, the environment that can be provided for antennas in electronic devices is getting worse and worse. In order to ensure the wireless communication function of electronic devices (such as mobile phones and the like), an antenna scheme that can still provide good radiation performance in a poor environment is needed. SUMMARY

[0003] Embodiments of the present application provide a terminal antenna and an electronic device, which can provide good radiation performance in a poor environment. The terminal antenna provided by the present application is applied in a low-frequency working scenario.

[0004] In order to achieve the above-mentioned purpose, embodiments of the present application adopt the following technical solutions:

[0005] In a first aspect, a terminal antenna is provided, which is arranged in an electronic device. The terminal antenna comprises a first radiator, a first feed source arranged on the first radiator, and a first grounding point arranged at one end of the first radiator. The first grounding point is connected to the first radiator through a first inductor, and the value of the first inductor is included in the range of [5nH, 47nH].

[0006] Based on the above scheme, by grounding the end of the radiator away from the feed source through the inductor, the electric field between the radiator and the reference ground can be adjusted, and a uniformly distributed electric field is obtained for radiation, so that good radiation performance is provided in a limited space.

[0007] In a possible design, a second inductor is arranged between the first feed source and the first radiator, one end of the second inductor is connected to the first feed source and the first radiator, the other end of the second inductor is grounded, and the second inductor is less than 5nH; the first inductor and / or the second inductor is used to adjust the resonant frequency of the terminal antenna. Based on the above scheme, the second inductor is arranged at the feed source, and through the tuning of the second inductor and the first inductor, the working frequency band of the entire antenna can be effectively adjusted.

[0008] In a possible design, the first radiator is arranged in an L-shaped structure at any corner of the electronic device; the L-shaped structure includes a first arm and a second arm, the first arm and the second arm are perpendicular to each other; the first feed source is arranged on the first arm, and the first grounding point is arranged on the second arm. Based on this scheme, a specific radiator arrangement and a feed source and grounding point arrangement position are provided. By arranging the antenna at the corner of the electronic device, the antenna can be matched with the electronic device electric field distribution eigenmode, thereby better exciting the floor to radiate, thereby improving the antenna radiation performance.

[0009] In a possible design, a straight line where the first arm is located is parallel to the long side of the electronic device. Based on this scheme, an example of a feed source arrangement position is provided. In this way, when the feed source excites the antenna, it can excite oblique currents and longitudinal currents on the floor, thereby better balancing the transverse currents and longitudinal currents, and thereby improving the antenna radiation performance.

[0010] In a possible design, a distance from the first feed source to the second arm is within a range of [0 mm, 30 mm]. Based on this scheme, an example of a feed source position arrangement is provided.

[0011] In a possible design, when the terminal antenna is in operation, a uniform electric field is distributed between the first radiator and the reference ground. A current reversal point is distributed on a first part of the first radiator. The first part is a part of the first radiator between the first feed source and the first grounding point. Based on this scheme, a limitation on the current distribution characteristics during operation of the antenna is provided. It can be understood that, for a general 1 / 4 wavelength mode or a left-handed mode, the current distribution between the feed source and the grounding point does not reverse.

[0012] In a possible design, a length of the first part is greater than 1 / 8 wavelength of a working frequency band and less than 1 / 4 wavelength of the working frequency band, and the working frequency band is a working frequency band of the terminal antenna. Based on this scheme, a limitation on the length of the radiator itself is provided. Compared with the 1 / 4 wavelength mode, a miniaturized design is realized.

[0013] In a possible design, the first radiator further includes a second part, the second part is connected to the first part at the first feed source, and an end of the second part away from the first feed source is suspended. Based on this scheme, an example of an extended antenna scheme is provided. In this way, the second part can excite additional resonant extension bandwidth.

[0014] In a possible design, a length of the second portion is included in a range of [30mm, 40mm]; when the terminal antenna is in operation, a 1 / 4 wavelength mode is excited on the second portion, and a direction of an electric field between the second portion and a reference ground is the same as a direction of an electric field between the first arm of the first portion and the reference ground. Based on this scheme, specific limitations on expansion of a main resonance during operation of the second portion are provided. For example, the main resonance (i.e., a resonance covering an operating frequency band) can be expanded in a high-frequency direction, so as to improve radiation performance.

[0015] In a possible design, the terminal antenna further includes a second radiator that is not connected to the first radiator, and one end of the second radiator is arranged opposite to the end of the first radiator on which the first grounding point is arranged. The second radiator is provided with a second grounding point, and the second grounding point is arranged on the second radiator close to the one end of the first radiator, and the other end of the second radiator is arranged in a suspended manner. Based on this scheme, another example of an extended antenna scheme is provided. In this way, the second radiator can excite an additional resonance to expand a bandwidth.

[0016] In a possible design, a length of the second radiator is included in a range of [13mm, 20mm]. When the terminal antenna is in operation, a parasitic mode excited on the second radiator has a resonance frequency lower than an operating frequency band of the terminal antenna. Based on this scheme, specific limitations on expansion of a main resonance during operation of the second radiator are provided. For example, the main resonance (i.e., a resonance covering an operating frequency band) can be expanded in a low-frequency direction, so as to improve radiation performance.

[0017] In a possible design, the second radiator is arranged outside a USB interface of the electronic device, and the second radiator is not connected to a body of the USB interface. Based on this scheme, a specific arrangement of the second radiator is provided. For example, the second radiator can be arranged on a USB appearance surface. In order to avoid interference between the second radiator and the USB interface, and to enable the second radiator to effectively function as a parasitic element, the second radiator can not be connected to the body (i.e., a metal part) of the USB interface.

[0018] In a possible design, the first feed source is configured to feed a low-frequency signal to the first radiator, and a frequency of the low-frequency signal is included in a range of [500MHz, 960MHz]. Based on this scheme, a specific application scenario of the terminal antenna is provided, for example, to cover a low-frequency frequency band in a split-feed scheme.

[0019] In a second aspect, a split-feed antenna system is provided, which includes a first antenna and a second antenna. The first antenna is the terminal antenna provided in the first aspect and any possible design thereof. The second antenna includes a third radiator, which is arranged in an L shape at a corner of the electronic device, and the corner where the third radiator is arranged is adjacent to the corner where the first antenna is arranged. The third radiator is not connected with the radiators of the first antenna, and one end of the third radiator is coupled with one end of the radiator of the first antenna through a gap. A second feed source is arranged on the third radiator, and the second feed source is used to feed a medium-high frequency signal to the second antenna, and the frequency of the medium-high frequency signal is included in the range of [1400MHz, 2700MHz]. Based on the present solution, an example of a split-feed antenna solution is provided. In the example, the terminal antenna provided in the first aspect covers the low frequency band, and the second antenna covers the medium-high frequency part. Therefore, the low frequency band can obtain better radiation performance in a relatively limited space. In addition, the radiator corresponding to the low frequency band can also produce frequency multiplication resonance in the medium-high frequency coverage process, so the medium-high frequency part in the split-feed antenna solution can also have better radiation performance.

[0020] In a possible design, a third grounding point is further arranged on the third radiator, and the third grounding point and the second feed source are arranged on two arms of the L-shaped structure of the third radiator. Based on the present solution, a manner of arranging the grounding point and the feed point on the third radiator is provided.

[0021] In a third aspect, an electronic device is provided, which is provided with the terminal antenna provided in the first aspect and any possible design thereof. When the electronic device performs low frequency signal transmission or reception, the terminal antenna is used for low frequency signal transmission or reception.

[0022] It should be understood that the technical solution of the above-mentioned third aspect can correspond to the first aspect and any possible design thereof, and therefore the beneficial effects that can be achieved are similar, which will not be described here again.

[0023] In a fourth aspect, an electronic device is provided, which is provided with the split-feed antenna system provided in the second aspect and any possible design thereof. When the electronic device performs signal transmission or reception, the split-feed antenna system is used for signal transmission or reception.

[0024] It should be understood that the technical solution of the above-mentioned fourth aspect can correspond to the technical solution provided in the second aspect and any possible design thereof, and therefore the beneficial effects that can be achieved are similar, which will not be described here again. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of an electronic device;

[0026] Figure 2 A schematic diagram of an antenna scheme;

[0027] Figure 3 A schematic diagram of an electric parameter distribution of an antenna scheme;

[0028] Figure 4 A schematic diagram of a composition of an electronic device provided by an embodiment of the present application;

[0029] Figure 5 A schematic diagram of an implementation of a frame antenna provided by an embodiment of the present application;

[0030] Figure 6 A schematic diagram of a composition of a terminal antenna provided by an embodiment of the present application;

[0031] Figure 7 A schematic diagram of an electric parameter distribution of a terminal antenna provided by an embodiment of the present application;

[0032] Figure 8 A schematic diagram of an electric field simulation of a terminal antenna provided by an embodiment of the present application;

[0033] Figure 9 A schematic diagram of a distribution of a floor eigenmode;

[0034] Figure 10A A schematic diagram of a comparison of a floor current excitation under different feed source settings provided by an embodiment of the present application;

[0035] Figure 10B A schematic diagram of a composition of a terminal antenna provided by another embodiment of the present application;

[0036] Figure 10C A schematic diagram of a composition of a terminal antenna provided by another embodiment of the present application;

[0037] Figure 11 A schematic diagram of a composition of a terminal antenna provided by another embodiment of the present application;

[0038] Figure 12 A schematic diagram of an electric parameter distribution of a terminal antenna provided by an embodiment of the present application;

[0039] Figure 13 A schematic diagram of a composition of a terminal antenna provided by another embodiment of the present application;

[0040] Figure 14 A schematic diagram of a radiation efficiency simulation of a terminal antenna provided by an embodiment of the present application;

[0041] Figure 15 A schematic diagram of a system efficiency simulation of a terminal antenna provided by an embodiment of the present application;

[0042] Figure 16 A simulation schematic diagram of a return loss of a terminal antenna provided by an embodiment of the application in a B8 frequency band hand model;

[0043] Figure 17 A simulation schematic diagram of a radiation efficiency of a terminal antenna provided by an embodiment of the application in a B8 frequency band hand model;

[0044] Figure 18 A simulation schematic diagram of a system efficiency of a terminal antenna provided by an embodiment of the application in a B8 frequency band hand model;

[0045] Figure 19 A simulation schematic diagram of a return loss of a terminal antenna provided by an embodiment of the application in a B5 frequency band hand model;

[0046] Figure 20 A simulation schematic diagram of a radiation efficiency of a terminal antenna provided by an embodiment of the application in a B5 frequency band hand model;

[0047] Figure 21 A simulation schematic diagram of a system efficiency of a terminal antenna provided by an embodiment of the application in a B5 frequency band hand model;

[0048] Figure 22 A simulation schematic diagram of a return loss of a terminal antenna provided by an embodiment of the application in a B5 frequency band head hand model;

[0049] Figure 23 A simulation schematic diagram of a radiation efficiency of a terminal antenna provided by an embodiment of the application in a B5 frequency band head hand model;

[0050] Figure 24 A simulation schematic diagram of a system efficiency of a terminal antenna provided by an embodiment of the application in a B5 frequency band head hand model;

[0051] Figure 25 A composition schematic diagram of a sub-feed antenna scheme provided by an embodiment of the application;

[0052] Figure 26 A composition schematic diagram of another sub-feed antenna scheme provided by an embodiment of the application. DETAILED DESCRIPTION

[0053] At least one antenna can be provided in an electronic device to support the wireless communication function of the electronic device.

[0054] For example, the electronic device is a mobile phone. Figure 1 A back view of an electronic device is shown. In the back view, a camera module can be seen arranged on the upper half of the back of the mobile phone. In the lower half of the mobile phone, components such as a battery can be arranged. In some implementations, an antenna in the mobile phone for performing main frequency communication can be arranged, for example,Figure 1 The main frequency can include 500MHz-960MHz, 1400MHz-2700MHz, etc. The 500MHz-960MHz can also be referred to as a low frequency part in the main frequency, or simply a low frequency band or low frequency. Based on the general frequency band division, the low frequency can further include B28 (i.e. 703MHz-803MHz), B5 (i.e. 824MHz-894MHz) and B8 (i.e. 880MHz-960MHz) and the like.

[0055] The antenna provided in the electronic device for covering the main frequency can be referred to as a main frequency antenna. The main frequency antenna can be implemented by one feed source to stimulate the full frequency band of the main frequency, or by multiple feed sources to stimulate the low frequency, medium-high frequency (e.g. medium frequency corresponding to 1400MHz-2170MHz, and high frequency corresponding to 2300MHz-2700MHz) respectively. The specific implementation form can be flexibly selected according to the structural environment provided for the antenna in the electronic device.

[0056] As an example, the low frequency, medium-high frequency is stimulated by multiple feed sources. The scheme of stimulating the main frequency by multiple feed sources can also be referred to as a split feed scheme. Please refer to Figure 2 , which is a schematic diagram of an antenna scheme for realizing low frequency coverage in a split feed scheme. As Figure 2 shown, the antenna can include a radiator, such as radiator 21. A feed source 21 can be provided on the radiator 21 for low frequency feeding of the antenna. In some implementations, the feed source 21 can be connected to the radiator 21 through a matching circuit 21. The matching circuit 21 can be used for adjusting the port matching of the antenna. In the example as Figure 2 , one or more components such as inductors can be provided in the matching circuit. One or more components can be provided in parallel, and the components in parallel can be grounded through a grounding point 21. The radiator 21 can also be provided with a grounding point 22. The grounding point 22 can also be provided with a matching circuit, such as Figure 2 the matching circuit 22 shown in. In some implementations, the matching circuit 22 can include an inductor with an inductance of less than 5nH for adjusting the inductance between the radiator 21 and the reference ground, thereby tuning the working frequency band of the antenna and realizing coverage of the low frequency band.

[0057] In the example as Figure 2In the shown antenna scheme, the arrangement of the radiator 21, the feed 21 and the ground 22 can be equivalent to an inverted-F antenna structure, thus forming a typical structure of an IFA antenna. The antenna can achieve low frequency coverage by exciting a 1 / 4 wavelength mode. It should be understood that in the 1 / 4 wavelength mode, the current distribution on the radiator 21 is in a same direction, i.e. there is no current reversal point on the radiator 21. For example, at some time, the part close to the feed 21 is a current strong point and the electric field is weak. Correspondingly, the part away from the feed 21, such as the part close to the ground 22, is a current weak point and the electric field is strong. Then, please refer to Figure 3 During the operation of the antenna, the current flow on the radiator 21 can be from the feed 21 to the ground 22, and there is no current reversal point. Correspondingly, due to the difference in the electric field distribution near the radiator, a strong electric field is distributed near the ground 22 and a weak electric field is distributed near the feed 21.

[0058] Generally, the typical IFA antenna has a very close relationship between its radiation performance and the environment around the antenna when it covers low frequencies by the 1 / 4 wavelength mode. For example, when the antenna clearance is large, the antenna can provide good radiation performance at low frequencies. Correspondingly, when the antenna clearance is small, the low frequency radiation performance provided by the antenna will be significantly affected. The antenna clearance can refer to the distance between the antenna radiator and the reference ground. The clearances at different positions of the antenna radiator can be different. In addition, other components with different dielectric constants arranged between the antenna radiator and the reference ground can also affect the radiation performance of the antenna.

[0059] With the development of electronic devices, more components need to be arranged in the limited space of the electronic device to provide more functions. Therefore, the clearance that can be provided for the antenna in the electronic device is increasingly limited, and in some environments, it is even less than 1 mm. Then, by using the traditional antenna scheme as shown in Figure 2 The traditional antenna scheme shown in the figure cannot achieve good coverage of low frequency bands and other frequency bands, and cannot well support the wireless communication function of the electronic device.

[0060] In order to provide good radiation performance in a limited space, the terminal antenna scheme provided in the embodiments of the present application uses a different excitation mode from the traditional one to radiate a uniform electric field between the radiator and the reference ground. Thus, the radiation performance in a small space (such as a small clearance) is improved. Since the clearance has a significant impact on the low frequency bandwidth, efficiency and other radiation performances in the traditional scheme, the antenna scheme provided in the embodiments of the present application can achieve better results when applied to low frequency coverage.

[0061] The scheme provided in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0062] The antenna scheme (or terminal antenna) provided by the embodiments of the present application can be applied in a user's electronic device to support the wireless communication function of the electronic device. For example, the electronic device can be a mobile phone, a tablet computer, a personal digital assistant (PDA), an augmented reality (AR) \ virtual reality (VR) device, a media player, or the like portable mobile device, or a smart watch or the like wearable electronic device. The embodiments of the present application do not specially limit the specific form of the device.

[0063] Please refer to Figure 4 , a structural schematic diagram of an electronic device 400 provided by the embodiments of the present application is shown. As shown in the figure, the electronic device 400 provided by the embodiments of the present application can be sequentially provided with a screen and cover plate 401, a metal shell 402, an internal structure 403, and a back cover 404 along the z-axis from top to bottom. Figure 4

[0064] Among them, the screen and cover plate 401 can be used to realize the display function of the electronic device 400. The metal shell 402 can be used as the main frame of the electronic device 400 to provide rigid support for the electronic device 400. The internal structure 403 can include electronic components and mechanical components that realize various functions of the electronic device 400. For example, the internal structure 403 can include a shielding cover, a screw, a reinforcing rib, etc. The back cover 404 can be the back appearance surface of the electronic device 400, which can be made of glass material, ceramic material, plastic, etc. in different implementations.

[0065] The antenna scheme provided by the embodiments of the present application can be applied in the electronic device 400 as shown in Figure 4 , to support the wireless communication function of the electronic device 400. In some embodiments, the antenna involved in the antenna scheme can be arranged on the metal shell 402 of the electronic device 400. In other embodiments, the antenna involved in the antenna scheme can be arranged on the back cover 404 of the electronic device 400, etc.

[0066] In different implementations of the embodiments of the present application, the specific implementation of the antenna can be different. For example, in some embodiments, the implementation of the antenna can be combined with the implementation of the electronic device 400 as shown in Figure 4 ​The metal frame on the metal housing 402 shown is used to implement this antenna design. In other embodiments, the antenna design can also be implemented using a flexible printed circuit (FPC), a metalframe diecasting for anodization (MDA) process, or other similar methods. Alternatively, the antenna design can be obtained by combining at least two of the above implementation methods.

[0067] As an example, consider the metal housing 402 with a metal frame architecture. Figure 5 A schematic diagram of the composition of a metal housing 402 is shown. In this example, the metal housing 402 can be made of a metallic material, such as an aluminum alloy. Figure 5 As shown, a reference ground can be provided on the metal housing 402. This reference ground can be a large-area metal material, used to provide most of the rigid support while providing a zero-potential reference for the various electronic components. In... Figure 5 In the example shown, a metal frame can also be provided around the reference ground. This metal frame can be a complete closed metal ring, or it can be as follows: Figure 5 The image shows a metal frame interrupted by one or more gaps. For example, in... Figure 5 In the example, slots 1, 2, and 3 can be set at different locations on the metal frame. These slots can break the metal frame, thereby obtaining independent metal stubs. In some embodiments, some or all of these metal stubs can be used as radiating stubs (or radiators) of an antenna, thereby achieving structural reuse in the antenna setup process and reducing the difficulty of antenna setup. When the metal stubs are used as radiating stubs of an antenna, the positions of the slots set at one or both ends of the metal stubs can be flexibly selected according to the antenna setup.

[0068] In such Figure 5 In the examples shown, one or more metal pins may also be provided on the metal frame. In some examples, the metal pins may have screw holes for securing other structural components with screws. In other examples, the metal pins may be coupled to a feed point (also called a feed source) so that the antenna can be fed through the metal pin when the metal stub connected to the metal pin is used as a radiating stub of the antenna. In still other examples, the metal pins may also be coupled to other electronic components to achieve corresponding electrical connection functions.

[0069] In such Figure 5In some examples, the printed circuit board (PCB) on the metal shell 402 is also shown. For example, the main board and the sub board are separated. In some examples, the main board and the sub board can also be connected, such as an L-shaped PCB design. In some examples, the main board (such as PCB1) can be used to carry electronic components of the electronic device 400. For example, a processor, a memory, a radio frequency module, and the like. The sub board (such as PCB2) can also be used to carry electronic components. For example, a universal serial bus (USB) interface and related circuits, a speaker box, and the like. The USB interface can be a Micro-USB interface, or a type-C interface, and the like. In some examples, the sub board can also be used to carry the radio frequency circuit corresponding to the antenna arranged at the bottom (i.e., the y-axis negative direction part of the electronic device).

[0070] The electronic device 400 in the above examples is only one possible composition. In some examples of the present application, the electronic device 400 can also have other compositions. For example, in order to realize the wireless communication function of the electronic device 400, a communication module can be arranged in the electronic device. The communication module can include an antenna, a radio frequency module for signal interaction with the antenna, and a processor for signal interaction with the radio frequency module, and different modules can be connected through a radio frequency cable. The processor can include a modem, an application processor (AP), a baseband processor (BP), and the like. For example, the signal interaction between the radio frequency module and the antenna can be analog signal interaction. The signal between the radio frequency module and the processor can be analog signal or digital signal.

[0071] The antenna provided by the embodiments of the present application can be applied to an electronic device with a composition as shown in Figure 4 or Figure 5 .

[0072] From the perspective of the working principle of the antenna, the antenna scheme provided by the embodiments of the present application can be an antenna scheme with a magnetic current loop radiation characteristic. As an example, the antenna scheme provided by the embodiments of the present application can be provided with a grounding inductor on the part of the radiator away from the feed source. Based on the energy storage characteristic of the inductor to the magnetic energy, when the current on the radiator changes in the opposite direction due to the change of the feed signal, the current change on the radiator will be delayed compared with the voltage change, and then a strong electric field distribution is obtained near the end of the radiator close to the feed source. At the same time, combined with the Figure 3In addition to the description of the electric field distribution, the vicinity of the radiating body near one end of the grounding inductor has a strong electric field distribution. Thus, the electric field distribution in the region between the radiating body between the feed source and the grounding inductor and the reference ground tends to be uniform. This radiation characteristic based on uniform electric field is the radiation characteristic of the magnetic current loop antenna. For related description of the magnetic current loop antenna, please refer to the patent applications with the application dates of September 3, 2021, and the application numbers of 2021110346044, 2021110333843, 202111034603X, and 2021110346114. Here, the description will not be repeated.

[0073] As an example, please refer to Figure 6 , which is a schematic diagram of an antenna scheme provided by an embodiment of the present application. In this example, the radiating body of the antenna is multiplexed with the metal frame. The specific implementation can be referred to the description of the above Figure 5 . It should be noted that in the following examples, in order to more clearly explain the antenna, the antenna radiating body is expanded outside the appearance surface of the electronic device. In actual implementation, when the antenna radiating body is multiplexed with the metal frame of the electronic device, the setting of the antenna radiating body will not exceed the appearance surface of the electronic device, so as not to affect the appearance of the electronic device.

[0074] As shown in Figure 6 , the antenna can be arranged at any corner of the electronic device. Taking a mobile phone as an example, the radiating body of the antenna can be arranged in an L shape, and the corner of the L-shaped radiating body corresponds to any one of the four corners of the mobile phone. For example, in the example as shown in Figure 6 , the radiating body (such as the radiating body 61) of the antenna can be arranged at the lower left corner of the mobile phone.

[0075] On the radiating body 61, a feed source 62 can be arranged, which can be used for low-frequency feeding of the antenna. On the part of the radiating body 61 away from the feed source 62, a grounding point 63 can be arranged. An inductor L1 can be arranged between the grounding point 63 and the radiating body 61. Taking the working frequency band covering the low frequency band as an example, the value of the inductor L1 can be included in the range of [5nH, 47nH]. Wherein, the part of the radiating body 61 away from the feed source can refer to the length of the radiating body 61 between the feed source 62 and the inductor L1, which meets the following restrictions: less than 1 / 4 wavelength of the working frequency band, and greater than 1 / 8 wavelength of the working frequency band. When calculating the wavelength, the dielectric constant of different antenna radiating bodies can be considered for conversion. The specific length of the radiating body between the feed source 62 and the inductor L1 can be flexibly set in combination with the working frequency band to be covered and the inductor L1.

[0076] The above description is from the perspective of the length of the radiator 61 between the feed source 62 and the inductor L1. From another perspective, the radiator 61 of the antenna is in an L-shaped distribution, and then the feed source 62 and the inductor L1 can be arranged on two arms of the L-shaped structure, respectively. That is, the feed source 62 and the inductor L1, or the feed source 62 and the grounding point 63 can be arranged around the corner of the electronic device.

[0077] Still taking the case of covering the low-frequency band as an example, in the case of arranging the feed source 62 on the side (such as the y-direction side or the long side) of the electronic device, the shortest distance from the feed source 62 to the transverse side (such as the x-direction transverse side or the short side) of the electronic device can be arranged in the range of [0mm, 30mm]. For example, taking the structure shown in Figure 6 as an example, the antenna is arranged at the lower left corner of the back view of the mobile phone, and then the shortest distance from the feed source 62 to the transverse side of the electronic device is the y-direction distance from the feed source 62 to the bottom side of the mobile phone. Then, in this example, the y-direction distance from the feed source 62 to the bottom side can be arranged in the range of [5mm, 30mm].

[0078] It should be noted that the specific implementation of the feed form of the antenna scheme provided by the embodiments of the present application can be different in different embodiments. For example, taking the arrangement of the feed source 62 as an example. The feed source 62 can be provided with a conductive spring, one end of the conductive spring can be connected (such as welded, screw-fixed connection, etc.) with the radio frequency cable on the PCB, and the other end of the conductive spring can be spring-connected with the radiator 61. Thus, the radio frequency cable for transmitting low-frequency radio frequency signals at the feed source 62 is electrically connected with the radiator 61. In other embodiments, the electrical connection can also be realized by metal pins, conductive glue, conductive foam, conductive screws, etc. Considering that in different scenarios, the components for electrical connection with the radiator 61 near the feed source 62 on the PCB also have requirements for the transverse dimension of the components themselves, and the components for electrical connection can also be provided with signal transmission lines such as radio frequency microstrip lines between the radio frequency ports on the PCB. Therefore, in order to enable the feed source 62 to be effectively fed, in the embodiments of the present application, the distance between the feed source 62 and the radio frequency port on the PCB for feeding signal transmission can be arranged in the range of [0.5mm, 8mm].

[0079] The above examples are from the perspective of the structure of the scheme provided by the embodiments of the present application. The working condition of the antenna scheme will be described below with reference to the accompanying drawings.

[0080] Please refer to Figure 7 , the antenna provided by the embodiments of the present application has a structure as shown in Figure 6 . The electrical parameter distribution of the antenna when working is shown. The electrical parameters shown can include current and electric field. For example, Figure 7As shown, when the antenna is operating, a uniformly distributed electric field can be formed near the radiator 61. The area near the radiator 61 can be understood as the region enclosed between the radiator 61 and the reference ground, and between the feed 62 and the grounding point 63 (or inductor L1). This achieves the radiation characteristics of the magnetic flux loop antenna, i.e., radiation through a uniform electric field. Continuing with... Figure 8 The actual simulation diagram shows that a uniform electric field can be distributed in the region near the radiator 61. This simulation result matches the radiation characteristics of the magnetohydrodynamic loop antenna described above.

[0081] From the perspective of current, such as Figure 7 As shown, a current including a current reversal point can also be distributed on the antenna radiator 61. This current reversal point can be located on the radiator between the feed 62 and the ground point 63. In contrast, in a conventional antenna design, combined with... Figure 3 In the example, the current distributed on the antenna radiator does not have a reverse point; that is, in traditional antenna designs, the current distributed on the radiator is in the same direction. This is also a significant distinguishing feature between the antenna design provided in this application embodiment and traditional antennas during operation.

[0082] It should be noted that the above Figure 6- Figure 8 In one example, the antenna can be positioned at the lower left corner of the rear view of the electronic device. In other embodiments of this application, the antenna can also be positioned at other locations on the electronic device, such as the lower right corner, upper left corner, or upper right corner of the rear view.

[0083] It is understood that the mechanism for setting the feed source on the long side in this application can be determined based on the eigenmode distribution of the electronic device's floor. For example, please refer to... Figure 9 This diagram illustrates the distribution of intrinsic eigenmodes of the electronic device's floor, as provided in an embodiment of this application. It shows the distribution of the floor electric field eigenmodes at different locations on the electronic device in the low-frequency band. As can be seen, the electric field strength is greatest at the four corners of the electronic device. Considering the working mechanism of the antenna scheme provided in this application, which radiates through a uniform electric field, when the feed source is placed near the corners of the electronic device, it can match the electric field distribution of the electronic device's floor eigenmodes, thereby providing better radiation performance.

[0084] In some embodiments, the antenna feed can be positioned on the long side radiator corresponding to a corner. This allows the feed to effectively excite both lateral and diagonal currents on the electronic device's floor eigenmodes while simultaneously matching the electric field distribution. Consequently, the electronic device's floor itself can participate in the antenna's radiation, further enhancing its radiation performance.

[0085] For example, such asFigure 10A As shown, when the feed is positioned on the bottom edge (short side), a strong lateral current can be induced on the ground plane of the electronic device. Decomposing this lateral current into lateral and longitudinal currents, the lateral current near the feed location is stronger, while the longitudinal current is relatively weaker. Therefore, the lateral and longitudinal current distributions are unbalanced. Conversely, when the feed is positioned on the side edge (long side), it can induce a significant longitudinal current while simultaneously inducing a longitudinal current. This results in a more balanced lateral and longitudinal current distribution when the feed is positioned on the side. Therefore, the side-mounted feed configuration, which generates balanced lateral and longitudinal currents, can improve antenna radiation performance.

[0086] In the above scheme, the antenna can radiate through a uniformly distributed electric field, thereby exciting a resonance to achieve low-frequency coverage. In practical implementation, there are scenarios where multiple low-frequency bands require time-division coverage. For example, at some times, the antenna needs to cover the B28 band; at other times, it needs to cover the B5 band; and at still other times, it needs to cover the B8 band. Based on the antenna scheme described above, adjustable components, such as adjustable switches or adjustable inductors, can be set at L1. This allows adjustment of the inductance value to the corresponding value when different low-frequency bands need to be covered, thereby adjusting the antenna's resonant frequency and achieving coverage of different low-frequency bands. It should be noted that in some implementations of this application, the low-frequency band can be extended to frequencies even lower than B28; for example, the low-frequency band may include [500MHz, 960MHz]. Switching between other low-frequency bands is similar to the switching between B5 / B8 / B28 described above, and will not be elaborated here.

[0087] For example, please refer to Figure 10B This is a schematic diagram illustrating the composition of another antenna provided in an embodiment of this application. Combined with... Figure 6 The antenna structure shown is in Figure 10B In this configuration, the grounding inductor L1 can be replaced by a switching component. This switching component can have at least two switching paths, and different switching paths can be equipped with inductors of different values. For example, Figure 10B Taking a switching component with four switching paths as an example, this component can function using a switch such as SP4T or 4SPST. In this example, the four switching paths can be configured with L3, L4, L5, and L6 respectively. The inductance values ​​of L3, L4, L5, and L6 are all different. Different inductance values ​​correspond to different low-frequency bands. Thus, when switching to a corresponding low-frequency band is required, the switching component is controlled to switch to the corresponding path, achieving different inductance configurations under different conditions, thereby adjusting the low-frequency coverage band.

[0088] In such Figure 10BIn the example shown in FIG. 6, a matching circuit can also be provided between the feed 62 and the radiator 61. The matching circuit can be used to adjust the port matching of the antenna. In some embodiments, for example, the matching circuit can include a parallel inductor L2. The L2 can be used to cooperate with the L1 or the switching component to achieve a larger range of low frequency band switching functions. As an example, the inductance of the L2 can be set to be less than 5nH.

[0089] It should be noted that in the example shown in FIG. 6, the switching component is provided at the position corresponding to the L1 to achieve low frequency switching. In other embodiments, the switching component can also be provided at the position corresponding to the L2, or both the L1 and the L2, to achieve the low frequency switching function. Figure 10B

[0090] In the above examples, the feed 62 is provided on the long side. It should be understood that the position of the feed 62 can be adjusted flexibly on the long side as needed. For example, in the example shown in FIG. 7, the feed 62 can be moved to the corner of the electronic device. Figure 10C Figure 10B In the example shown in FIG. 7, the feed 62 can be moved to the corner of the electronic device. Correspondingly, the position of the inductor L2 can not be changed. In the structure after the feed 62 is moved, there will be uniform electric field distribution for radiation between the feed 62 and the inductor L2, and between the feed 62 and the inductor L1. In addition, since the feed 62 is provided at the corner, the current reversal point is located at the corner. Correspondingly, a small magnetic current loop antenna can be formed between the feed and the L1, and a small magnetic current loop antenna can also be formed between the feed and the L2. Therefore, from the perspective of current distribution, there can be a current reversal point between the feed and the L1, a current reversal point at the feed, and a current reversal point between the feed and the L2.

[0091] In other embodiments, the present application also provides another antenna structure, so that the antenna can generate additional resonances while exciting a resonance (referred to as a magnetic current loop zero-order mode resonance) through uniform electric field when the antenna is working, to improve the low frequency radiation performance.

[0092] For example, referring to FIG. 8, in the structure shown in FIG. 6, the radiator 61 can be extended in the y direction. In this way, the radiator 61 of the antenna can include the part between the feed 62 and the ground point 63, and the extended part. For example, in the case where the working frequency band of the antenna covers the low frequency band, the length of the extended part (i.e., the radiator from the feed 62 to the end away from the ground point 63) can be set to be in the range of [30mm, 40mm]. Figure 11 Figure 6 In the example shown in FIG. 8, the radiator 61 can be extended in the y direction. In this way, the radiator 61 of the antenna can include the part between the feed 62 and the ground point 63, and the extended part. For example, in the case where the working frequency band of the antenna covers the low frequency band, the length of the extended part (i.e., the radiator from the feed 62 to the end away from the ground point 63) can be set to be in the range of [30mm, 40mm]. ​​​

[0093] In such Figure 11 When the antenna shown is operating, it can obtain a uniformly distributed electric field in the region between the feed 62 and the ground point 63, and can also obtain additional resonance based on the radiation of the extended portion. For example, the extended portion can be excited to a resonance in the range of [1GHz, 1.5GHz] using a 1 / 4 wavelength mode. The electric field direction corresponding to the extended portion is the same as the electric field direction corresponding to the zero-order mode of the magnetic flux loop. Although this resonance may not necessarily fall within the low-frequency band, because it is close to the low-frequency band (such as close to the high-frequency side of the low-frequency band), it can achieve the effect of expanding the bandwidth and improving efficiency on the high-frequency side of the zero-order mode resonance of the magnetic flux loop. In addition, in non-free space scenarios, such as hand-held (i.e., hand-shaped scenario) and telephone (i.e., head-hand-shaped scenario), the bandwidth expansion can significantly reduce the loss of antenna performance caused by hand-shaped or head-hand-shaped models.

[0094] From the perspective of current distribution, combined with Figure 12 It has the following characteristics: Figure 11 When the antenna with the structure shown is in operation, there is a current reversal point distributed between the feed 62 and the ground point 63. For the extension, the current is high near the feed 62 and low at the end of the extension away from the feed. Therefore, the extension can have a current flow direction from the feed 62 to the end. That is, the current direction in the extension is opposite to the current direction near the feed 62 towards the ground point 63, thus forming another current reversal point. In other words, with this extension, the radiator 61 can include two current reversal points from the perspective of current distribution within the operating frequency band.

[0095] The above Figure 11 as well as Figure 12 In one example, the radiator 61 is extended near the feed source 62 to obtain additional resonance, which, together with the zero-order mode resonance of the magnetic flux loop, covers the low-frequency band. In other embodiments of this application, as in... Figure 6 or Figure 11 Based on the scheme shown, another structural arrangement can be made near the grounding point 63 to obtain more resonance and expand the low-frequency coverage.

[0096] For example, please refer to Figure 13 , in order to Figure 11Taking the illustrated scheme as an example, a radiator 65, which is not connected to the radiator 61, can be provided at the end of the radiator 61 near the grounding point 63. For example, the radiator 65 can be provided on the outside of the USB interface. The radiator 65 can be unconnected to the USB interface-related components (such as the USB body metal parts). One end of the radiator 65 can be positioned opposite the end of the radiator 61 near the grounding point 63, and the two radiators are separated by a gap. In some embodiments, the width of the gap can be set in the range of [0.8mm, 1.5mm].

[0097] A grounding point 64 can also be provided on the radiator 65. In different implementations, the grounding point 64 can be located at the end of the radiator 65 near the radiator 61, or at the end of the radiator 65 away from the radiator 61. In this example, the grounding point 64 is located at the end near the radiator 61. In this way, based on the parasitic effect, when a current from the feed 61 is distributed on the radiator 61 (i.e., when the antenna is working), the radiator 65 can couple energy through the gap between it and the radiator 61, thereby obtaining energy on the radiator 65 and exciting the corresponding parasitic resonance. In this example, the radiator 65 can generate parasitic resonance on the low-frequency side of the low-frequency band, thereby obtaining additional resonance on the low-frequency side of the zero-order mode resonance of the magnetic flux loop, which is used to extend the low-frequency bandwidth and efficiency of the antenna scheme provided in this application embodiment. At the same time, similar to Figure 11 The extended portion in the illustrated scheme serves to broaden the bandwidth, and the radiator 65 can also reduce the performance loss caused by hand or head-mounted models. Taking the antenna's operating frequency band covering a low-frequency band as an example, the length of the radiator 65 can be set within the range of [13mm, 20mm].

[0098] It should be understood that the aforementioned Figure 6- Figure 13 The provided antenna solution, compared to traditional antennas (such as...) Figure 2 The antenna scheme shown can provide better radiation performance at low frequencies. Furthermore, due to the wider low-frequency bandwidth, better performance for hand and head-and-hand molds can also be achieved. The following uses... Figure 13 Taking the structure shown as an example, the above-mentioned beneficial effects are explained through simulation results.

[0099] For example, please refer to Figure 14 ,for Figure 13 The diagram illustrates the radiation efficiency curve of the structure during operation. Radiation efficiency can be a metric used to indicate antenna efficiency. Radiation efficiency indicates the highest efficiency achievable by the current antenna system at all frequencies under full-band port matching. Correspondingly, antenna efficiency can also include system efficiency. Unlike radiation efficiency, system efficiency refers to the efficiency the antenna can achieve under the current port matching. For ease of comparison, in...Figure 14 The radiation efficiency of the conventional antenna scheme (e.g., the antenna scheme shown in Figure 2 ) is also shown as a comparison. As shown in Figure 14 , the radiation efficiency of the antenna scheme provided by the embodiments of the present application is significantly higher than the conventional scheme in the low frequency band. For example, near 900MHz, the antenna scheme provided by the embodiments of the present application with the structure shown in Figure 13 has 1dB improvement in radiation efficiency compared to the conventional antenna scheme. Please refer to Figure 15 , which shows the system efficiency curve of the structure shown in Figure 13 . In Figure 15 , the system efficiency of the conventional antenna scheme (e.g., the antenna scheme shown in Figure 2 ) is also shown as a comparison. It can be seen that in the B5 full frequency band, the system efficiency of the antenna scheme provided by the embodiments of the present application is higher than the conventional antenna scheme. Among them, near 850MHz with the best port matching, the system efficiency optimization is close to 1dB. That is, through the comparison of Figure 14 and Figure 15 , it can be seen that in free space, the antenna scheme provided by the embodiments of the present application can provide better bandwidth and efficiency compared to the conventional antenna.

[0100] The following describes the hand model and head-hand model performance of the antenna scheme provided by the embodiments of the present application in combination with the simulation results. Among them, the antenna with the structure shown in Figure 13 is taken as an example.

[0101] For example, please refer to Figure 16 , which shows the curve of the return loss (S11) of the antenna scheme provided by the embodiments of the present application in the hand model scenario when covering B8. As shown in Figure 16 , in the case that the antenna is used to cover B8, taking the free space S11 as an example, the antenna can produce multiple resonances. For example, the multiple resonances can include resonance 1, which can correspond to the magnetic current loop zero-order mode resonance in the foregoing description. The multiple resonances can also include resonance 2, which can correspond to the parasitic resonance produced by the radiator 65 in the foregoing description. The multiple resonances can also include resonance 3, which can correspond to the 1 / 4 mode resonance produced by the extension part in the foregoing description. From the S11 of the free space, the deepest point has exceeded -14dB, so it can have good radiation performance in free space. From the S11 of the hand model, the S11 of the left and right hand models has a certain frequency deviation compared to the free space, which can be caused by the absorption of the hand model close to the antenna to the antenna radiation. As shown in Figure 16As shown, the deepest point of the left-handed mode S11 is more than-18dB, and the deepest point of the right-handed mode S11 is also-8dB, so the radiation performance in the two-handed mode scenarios can be guaranteed. At the same time, compared with free space, the frequency deviation of the left-handed mode and the right-handed mode is not more than 50MHz. That is, the antenna scheme provided by the embodiment of the application will not cause the frequency deviation to be too large due to the influence of the hand mode on the antenna, and thus cannot effectively cover the working frequency band. It can be understood that, as Figure 13 The structure shown in the structure for exciting resonance 2 and resonance 3 is arranged to expand the bandwidth of the main resonance (such as resonance 1, i.e. the magnetic current loop zero-order mode resonance), thereby achieving the beneficial effects of the above-mentioned small hand mode offset and good hand mode S11.

[0102] The radiation performance of the antenna is described below in combination with the efficiency simulation. Please refer to Figure 17 The antenna scheme provided by the embodiment of the application in the B8 coverage, the radiation efficiency curve of the hand mode scenario is shown. It can be seen that in the free space and the right-handed mode scenario, the radiation efficiency in the B8 frequency band is more than or close to-7dB. In the left-handed mode scenario, the radiation efficiency in the B8 frequency band is also more than-7.5dB. Please refer to Figure 18 The antenna scheme provided by the embodiment of the application in the B8 coverage, the system efficiency curve of each test scenario is shown. Corresponding to the radiation efficiency, in the free space and the right-handed mode scenario, the radiation efficiency peak is more than or close to-7dB. In the left-handed mode scenario, the radiation efficiency peak is also more than-8dB. Considering that the simulation result is an overall machine simulation, the difference between the simulation result and the actual measurement result is very limited. Therefore, in the case where the radiation efficiency of the hand mode is more than-7.5dB and the system efficiency is more than-8dB, it can be proved that the antenna scheme provided by the embodiment of the application can provide good radiation performance in the B8 frequency band.

[0103] The above Figure 16- Figure 18 is described by taking the radiation of the antenna scheme provided by the embodiment of the application working in the B8 as an example. By switching the size of the grounding inductance, the working frequency band of the antenna can also be adjusted to cover other frequency bands in the low frequency band, such as B5, B28, etc. It should be understood that when covering other frequency bands, the antenna provided by the embodiment of the application can still provide good radiation performance. For example, the working frequency band of the antenna covers B5.

[0104] Please refer to Figure 19 The antenna scheme provided by the embodiment of the application in the B5 coverage, the return loss (S11) curve of the hand mode scenario is shown. As Figure 19As shown, in the case of covering B5, the antenna can generate multiple resonances in terms of free space S11. For example, the multiple resonances can include resonance 1, which can correspond to the aforementioned magnetic current loop zero-order mode resonance. The multiple resonances can also include resonance 2, which can correspond to the aforementioned parasitic resonance generated by the radiator 65. The multiple resonances can also include resonance 3, which can correspond to the aforementioned 1 / 4 mode resonance generated by the extended part. From the S11 of free space, the deepest point has exceeded -16 dB, so it can have good radiation performance in free space. From the S11 of the hand model, the S11 of the left-hand model and the right-hand model are both frequency offset compared with free space, which can be caused by the absorption of the hand model close to the antenna to a certain extent. As shown in Figure 19 As shown, the deepest point of the left-hand model S11 exceeds -16 dB, and the deepest point of the right-hand model S11 is also close to -8 dB, so the radiation performance in the two hand model scenarios can be guaranteed. At the same time, from the perspective of the frequency offset compared with free space, the frequency offset of the left-hand model and the right-hand model is not more than 50 MHz. That is, the antenna scheme provided by the embodiment of the present application will not occur due to the influence of the hand model on the antenna, so that the frequency offset is too large, and the working frequency band cannot be effectively covered. It can be understood that, as shown in Figure 13 The structure of the structure shown in the structure of the resonance 2 and the resonance 3, by expanding the bandwidth of the main resonance (such as resonance 1, i.e. the magnetic current loop zero-order mode resonance), so as to achieve the above-mentioned beneficial effects of small hand model offset and good S11 of the hand model itself. In combination with Figure 16- Figure 17 The B8 scenario and the like, it can be seen that the hand model test situation in the B5 scenario is similar to B8, that is, the antenna provided by the embodiment of the present application can provide good radiation performance in free space and hand model scenarios.

[0105] The following continues to combine the efficiency simulation to describe the radiation performance of the antenna. Please refer to Figure 20 The antenna scheme provided by the embodiment of the present application covers B5, the radiation efficiency curve of the hand model scenario. It can be seen that in free space and right-hand model scenarios, the radiation efficiency in B5 frequency band is more than or close to -6.5 dB. In the left-hand model scenario, the radiation efficiency in the B5 frequency band is also close to more than -7 dB. Please refer to Figure 21The antenna scheme provided by the embodiment of the present application provides a curve diagram of system efficiency in each test scene when covering B5. Corresponding to the radiation efficiency, in the free space and right-hand mode scene, the peak value of the radiation efficiency is more than -7 dB. In the left-hand mode scene, the peak value of the radiation efficiency is also -8 dB. Considering that the simulation result is the whole machine simulation, the simulation result is very limitedly different from the actual measurement result, therefore, in the case that the radiation efficiency of the hand mode is more than -7 dB and the system efficiency is more than -8 dB, it is sufficient to prove that the antenna scheme provided by the embodiment of the present application can provide better radiation performance in the B5 frequency band. That is to say, similar to the coverage scene of B8, when the antenna scheme provided by the embodiment of the present application is used to cover the B5 frequency band, better radiation performance can also be provided.

[0106] Similarly, better free space and hand mode radiation performance can also be provided in the B28 frequency band, which will not be described here.

[0107] The radiation of the antenna scheme provided by the embodiment of the present application in the head-hand mode scene will be described below in combination with the simulation result. In this example, the working frequency band of the antenna covers B5. Please refer to Figure 22 The S11 of the antenna scheme provided by the embodiment of the present application in the free space, left head-hand mode and right head-hand mode is compared. Please refer to Figure 19 The hand mode simulation in the B5 frequency band is shown in Figure 22 The simulation result of the head-hand mode is similar to Figure 19 The hand mode simulation is shown in, that is to say, from the perspective of S11, the head mode does not have a significant impact. Please refer to Figure 23 The radiation efficiency of the antenna scheme provided by the embodiment of the present application in the free space, left head-hand mode and right head-hand mode is compared. For the left head-hand mode, the radiation efficiency in the B5 frequency band is more than or close to -10 dB, and the head-hand amplitude is about 2 dB-3 dB. For the right head-hand mode, the radiation efficiency in the B5 frequency band is more than -9 dB, and the head-hand amplitude is about 3.5 dB. Please refer to Figure 24 The system efficiency of the antenna scheme provided by the embodiment of the present application in the free space, left head-hand mode and right head-hand mode is compared. For the left head-hand mode, the peak value of the system efficiency in the B5 frequency band is close to -10 dB, and the head-hand amplitude of the peak value of the efficiency is about 4 dB. For the right head-hand mode, the peak value of the system efficiency in the B5 frequency band is close to -9 dB, and the head-hand amplitude of the peak value of the efficiency is about 3 dB. It should be understood that, in the case that the current low-frequency head-hand amplitude is generally more than 6 dB, the head-hand amplitude of the antenna scheme provided by the embodiment of the present application is controlled within 4 dB in the head-hand mode scene, therefore, in the case that the free space performance can be guaranteed, better radiation performance of the head-hand mode can also be provided.

[0108] Through the above description, those skilled in the art should have a comprehensive understanding of the antenna scheme provided by the embodiments of the present application. The scheme can realize the radiation characteristics of the magnetic current loop antenna through electric field radiation, and can provide better radiation performance in the low frequency band in the scenarios of free space, a hand model, and a head-hand model.

[0109] In the above Figure 6- Figure 24 each antenna scheme provided, the low frequency band is taken as an example for description. In other embodiments of the present application, the antenna scheme can also be used to increase coverage of other frequency bands of the main frequency, or to increase coverage of other frequency bands such as WIFI, BT, 5G frequency bands, etc. The beneficial effects that can be provided are similar, which will not be described here.

[0110] Based on the above Figure 6- Figure 24 each antenna scheme provided, the antenna is applied in the low frequency coverage of the split feed scenario. In the electronic device, a middle-high frequency feed and a corresponding antenna part can also be provided, so that the split feed antenna scheme can cover the full frequency band of the main frequency.

[0111] An exemplary Figure 25 split feed antenna scheme is provided by the embodiments of the present application. The antenna can be used to cover the main frequency band. Among them, the feed source 62 and the radiating body 61, the grounding point 63, the inductor L1, the radiating body 65, and the grounding point 64 can constitute a low frequency radiation part for covering the low frequency band. The specific settings of the low frequency radiation part can refer to the examples in the foregoing description, which will not be described here. As Figure 25 shown, the split feed antenna scheme can also include a middle-high frequency radiation part. The middle-high frequency radiation part can be arranged at the lower right corner of the back view of the electronic device. The middle-high frequency radiation part can include a feed source 66 for providing a middle-high frequency feed signal. The feed source 66 can be arranged on the radiating body 69. In some embodiments, when the low frequency radiation part is arranged at the lower left corner of the back view of the electronic device, the radiating body 69 can also be arranged in an L-shaped structure at the lower right corner of the back view of the electronic device. The feed source 66 can be arranged at one end of the radiating body 69 close to the USB (or close to the low frequency radiation part). In some embodiments, a series capacitor can be arranged in the matching network corresponding to the feed source 66, so as to excite the corresponding left-handed mode. The grounding point 67 can be arranged at the end of the radiating body 69 away from the feed source 66. As Figure 25In the example, other grounding points, such as grounding point 68, can be provided on the radiator 69 at locations different from the two ends. Grounding point 68 can provide an additional ground return path, enabling the antenna to excite higher frequency resonances. It should be noted that in some implementations, an inductor, adjustable device, or switching component can be connected between grounding point 68 and / or grounding point 67 and the radiator to switch between different high-frequency modes. Of course, in scenarios with narrow high-frequency coverage bandwidth, grounding point 67 and / or grounding point 68 can be selectively provided, i.e., grounding point 67 and / or grounding point 68 can be omitted.

[0112] This application also provides a split-feed antenna scheme, such as... Figure 26 As shown. In this example, combined with Figure 25 For example, the low-frequency radiation component is related to Figure 25 Similar to the example, for the high-frequency radiation section, the difference lies in the fact that the positions of grounding point 68 and feed 66 can be different. For instance, grounding point 68 can be located on the radiator 69 at a different end than grounding point 67, i.e., the end closer to the low-frequency radiation section. Correspondingly, feed 66 can be located on the radiator 69 at a different position than either of the two ends. Figure 25 Similar to the scheme in the example, in some embodiments, such as Figure 26 The grounding point 67 and / or grounding point 68 shown may also be selectively set.

[0113] When operating in the mid-to-high frequency radiation section, the feed 66 can be connected to a mid-to-high frequency signal, which may include [1400MHz, 2700MHz]. For example... Figure 25 or Figure 26 In the illustrated split-feed antenna scheme, the mid-to-high frequency radiating portion can be excited to obtain at least two resonances at both the mid-frequency and high-frequency bands. For example, in the mid-frequency band, the excited resonances may include the left-handed mode resonance formed on radiator 69, and the harmonic resonance corresponding to the mid-frequency signal excited by radiator 61 through coupling with radiator 65. In the high-frequency band, the excited resonances may include the resonance corresponding to the left-handed mode (or IFA mode) distributed on the radiator between radiator 69 and ground point 68, and the resonance of the parasitic mode excited by radiator 65 through parasitic effects. In some embodiments, an inductor may also be connected in series between ground point 64 and radiator 65 to adjust the electrical length of the parasitic mode. For example, the value of this series inductor may be less than 5nH.

[0114] For details on the left-hand mode and related structure settings, please refer to CN201380008276.8 and CN201410109571.9, which will not be elaborated here.

[0115] It should be understood that, Figure 25 orFigure 26 In the split-feed antenna scheme in the foregoing description, the arrangement of the high-frequency radiation part is only an example, and in other structures or scenarios, the high-frequency radiation part can also achieve medium-high frequency coverage through other antenna structures. Since the low-frequency radiation part adopts the antenna scheme provided by the embodiments of the present application, and the low-frequency radiation part is relatively independent of the high-frequency radiation part, regardless of the arrangement of the high-frequency radiation part, the radiation performance that the split-feed antenna scheme can provide at low frequencies corresponds to the beneficial effects in the foregoing description respectively.

[0116] Although the present application has been described in connection with specific features and embodiments thereof, it is evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the present description and drawings are to be regarded simply as illustrative of the present application and are not to be interpreted in a limiting sense. Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

Claims

1. A terminal antenna, characterized by, The terminal antenna is arranged in an electronic device, and the terminal antenna comprises: a first radiator, a first feed source arranged on the first radiator, and a first grounding point arranged at one end of the first radiator; The first grounding point is connected to the first radiator through a switching component; the switching component comprises a plurality of paths, each path is provided with a first inductor with an inductance value in the range of [5nH, 47nH], and the inductance values of the first inductors on different paths are different; the first inductor is used to form a uniform electric field between the first radiator and a reference ground when the terminal antenna is working; The length of the first part is greater than 1 / 8 wavelength of a working frequency band and less than 1 / 4 wavelength of the working frequency band, the working frequency band being a working frequency band of the terminal antenna; the first part is a radiator between the first feed source and the first grounding point on the first radiator; The first radiator is arranged in an L-shaped structure at any corner of the electronic device; the L-shaped structure comprises a first arm and a second arm, and the first arm and the second arm are perpendicular; The first feed source is arranged on the first arm, and a straight line on which the first arm is located is parallel to a long side of the electronic device; a straight line on which the second arm is located is parallel to a short side of the electronic device; The first radiator further comprises a second part, the second part is connected to the first part at the first feed source, and one end of the second part away from the first feed source is suspended; The distance from the first feed source to the short side of the electronic device is less than 30mm; The second part generates a first resonance by exciting a 1 / 4 wavelength mode, and the frequency domain position of the first resonance is higher than the working frequency band.

2. The terminal antenna of claim 1, wherein, A second inductor is arranged between the first feed source and the first radiator, one end of the second inductor is connected to the first feed source and the first radiator, and the other end of the second inductor is grounded, and the second inductor is less than 5nH; The first inductor and / or the second inductor are used to adjust the resonance frequency of the terminal antenna.

3. The terminal antenna of claim 1 or 2, wherein: The first part of the first radiator is provided with one current reversal point.

4. The terminal antenna according to any one of claims 1 to 3, characterized in that, The length of the second part is included in the range of [30mm, 40mm]; When the terminal antenna is working, the 1 / 4 wavelength mode is excited on the second part, and the direction of the electric field between the second part and the reference ground is the same as the direction of the electric field between the first arm of the first part and the reference ground.

5. The terminal antenna according to any one of claims 1-4, wherein, The terminal antenna further comprises a second radiator, the second radiator is not connected to the first radiator, and one end of the second radiator is arranged opposite to one end of the first radiator on which the first grounding point is arranged; A second grounding point is arranged on the second radiator, the second grounding point is arranged on the second radiator close to one end of the first radiator, and the other end of the second radiator is suspended.

6. The terminal antenna of claim 5, wherein, The length of the second radiator is included in the range of [13mm, 20mm]. ​ The terminal antenna works, and a resonance frequency of a parasitic mode excited on the second radiator is lower than a working frequency range of the terminal antenna.

7. The terminal antenna according to claim 5 or 6, characterized in that The second radiator is arranged outside a USB interface of the electronic device, and the second radiator is not connected with a body of the USB interface.

8. The terminal antenna according to any one of claims 1-7, wherein, The first feed source is configured to feed a low-frequency signal to the first radiator, and a frequency of the low-frequency signal is included in a range of [500 MHz, 960 MHz].

9. A distributed antenna system, comprising: The split-feed antenna system comprises a first antenna and a second antenna, and the first antenna is the terminal antenna according to any one of claims 1-8. The second antenna comprises a third radiator, the third radiator is arranged in a corner of the electronic device in an L shape, and the corner where the third radiator is arranged is adjacent to the corner where the first antenna is arranged. The third radiator is not connected with the radiators of the first antenna, and one end of the third radiator is coupled with one end of the radiator of the first antenna through a gap. The third radiator is provided with a second feed source, the second feed source is configured to feed a medium-high frequency signal to the second antenna, and a frequency of the medium-high frequency signal is included in a range of [1400 MHz, 2700 MHz].

10. The feed system of claim 9, wherein, The third radiator is further provided with a third grounding point, and the third grounding point and the second feed source are arranged on two arms of the corresponding L-shaped structure of the third radiator.

11. An electronic device, comprising: The electronic device is provided with the terminal antenna according to any one of claims 1-8, and the electronic device performs transmission or reception of a low-frequency signal through the terminal antenna when performing transmission or reception of the low-frequency signal.

12. An electronic device, comprising: The electronic device is provided with the split-feed antenna system according to claim 9 or 10, and the electronic device performs transmission or reception of a signal through the split-feed antenna system when performing transmission or reception of the signal.

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