Antenna device and electronic device

Abstract

The application relates to an antenna device and an electronic device. The antenna device comprises a first radiator and a second radiator connected to the first radiator. The first radiator comprises a first connecting end, a second connecting end, a feeding point and a grounding point arranged between the first connecting end and the second connecting end, the feeding point is used for connecting a feed source, and the distance between the grounding point and the second connecting end is greater than the distance between the feeding point and the second connecting end. The second radiator is electrically connected to the first connecting end. The first radiator is used for supporting a first frequency band, the second radiator is used for supporting a second frequency band, and the first frequency band and the second frequency band are different. When the first radiator supports the first frequency band, the excitation current input via the feeding point is distributed on the first radiator and the second radiator. The electronic device comprises a shell and the above-mentioned antenna device, and the radiators are integrated in the shell. The current distribution of the radiators of the above-mentioned antenna device is relatively balanced, and the SAR value of the antenna device is relatively low.

Description

Technical Field

[0001] This application relates to the field of mobile communication technology, and more specifically, to an antenna device and an electronic device. Background Technology

[0002] With the rapid development and advancement of science and technology, communication technology has made significant progress. This advancement has led to an unprecedented level of adoption of smart electronic products, with more and more smart terminals and electronic devices becoming indispensable parts of people's lives, such as smartphones, smart bracelets, smartwatches, smart TVs, and computers. Currently, electronic devices typically incorporate communication antennas to meet users' communication needs. As people's demands for communication efficiency and variety increase, the power of antennas in electronic devices is also increasing, resulting in greater radiation exposure to the human body, which can have adverse effects. Summary of the Invention

[0003] This application provides an antenna device and an electronic device.

[0004] According to a first aspect of this application, an embodiment of this application provides an antenna device including a first radiator and a second radiator connected to the first radiator. The first radiator includes a first connection terminal, a second connection terminal, and a feed point and a ground point disposed between the first connection terminal and the second connection terminal. The feed point is used to connect to a feed source, and the distance between the ground point and the second connection terminal is greater than the distance between the feed point and the second connection terminal. The second radiator is electrically connected to the first connection terminal. The first radiator is used to support a first frequency band, and the second radiator is used to support a second frequency band, wherein the first frequency band and the second frequency band are different. When the first radiator supports the first frequency band, the excitation current input via the feed point is distributed across the first radiator and the second radiator.

[0005] According to a second aspect of this application, an embodiment of this application provides an electronic device including a housing and the antenna device described above, with the radiator integrated into the housing.

[0006] In the antenna device and electronic device provided in this application embodiment, when the first radiator supports the first frequency band, the excitation current input through the feed point is distributed on the first radiator and the second radiator. Therefore, the excitation current corresponding to the signal of the first frequency band is shunt by the first radiator and the second radiator, which can improve the current distribution of the first radiator, thereby balancing the current concentration of the antenna device to a certain extent, and thus effectively reducing the overall SAR value of the antenna device. Therefore, the antenna device provided in this application embodiment has a low SAR value. Attached Figure Description

[0007] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1 This is a schematic diagram of the structure of an antenna device provided in an embodiment of this application.

[0009] Figure 2 This is a schematic diagram of another structure of the antenna device provided in the embodiments of this application.

[0010] Figure 3 This is a schematic diagram of another structure of the antenna device provided in the embodiments of this application.

[0011] Figure 4 This is a schematic diagram of an application example of the antenna device provided in the embodiments of this application.

[0012] Figure 5 yes Figure 4 The S-parameter diagram of the antenna device shown.

[0013] Figure 6-7 yes Figure 4 The simulation diagram of the electric field distribution of the antenna device shown.

[0014] Figure 8-9 yes Figure 4 A schematic diagram of the radiation efficiency of the antenna device shown.

[0015] Figure 10-11 yes Figure 4 The diagram shows a body SAR simulation of the antenna device.

[0016] Figure 12 This is a schematic diagram of another structure of the antenna device provided in the embodiments of this application.

[0017] Figure 13 This is a schematic diagram of another structure of the antenna device provided in the embodiments of this application.

[0018] Figure 14 This is a schematic diagram of the electronic device provided in the embodiments of this application.

[0019] Figure 15 yes Figure 14 The diagram shows the internal structure of the electronic device.

[0020] Figure 16 This is a schematic diagram of an antenna device provided in this application applied to an electronic device. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative effort are within the scope of protection of the present application.

[0022] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. The specification and claims do not distinguish components based on differences in name, but rather on differences in function. For example, the term "comprising" used throughout the specification and claims is an open-ended term and should be interpreted as "including but not limited to"; "generally" means that those skilled in the art can solve the technical problem and basically achieve the technical effect within a certain margin of error.

[0023] The term "electronic device" as used in this application includes, but is not limited to, devices configured to receive / transmit communication signals via wired connections (such as via the Public Switched Telephone Network (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection, and / or another data connection / network) and / or via a wireless interface (e.g., for cellular networks, wireless local area networks (WLANs), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters, and / or another communication terminal). A communication terminal configured to communicate via a wireless interface may be referred to as a "wireless communication terminal," "wireless terminal," "electronic device," and / or "electronic device." Examples of electronic devices include, but are not limited to, satellite or cellular phones; personal communication system (PCS) terminals that can combine cellular radiotelephones with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notebooks, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers, game consoles, or other electronic devices that include radiotelephone transceivers.

[0024] Specific Absorption Rate (SAR), also known as absorption ratio or absorption proportion, refers to the percentage of electromagnetic energy absorbed by electronic devices. Specifically, it means that under the influence of an external electromagnetic field, an induced electromagnetic field is generated within the human body. Since all organs of the human body are lossy media, this electromagnetic field generates an induced current, causing the body to absorb and dissipate electromagnetic energy. SAR is commonly used in biodosimetry to characterize this physical process. SAR represents the electromagnetic power absorbed or consumed per unit mass of human tissue, expressed in W / kg or mW / g. The formula is: SAR = σ|Ei|² / 2ρ, where:

[0025] Ei is the effective value of the electric field intensity in the cell tissue, expressed in V / m;

[0026] σ is the electrical conductivity of human tissue, expressed in S / m;

[0027] ρ is the density of human tissue, expressed in kg / m3.

[0028] The SAR (Specific Absorption Rate) in human tissue is proportional to the square of the electric field strength within that tissue and is determined by parameters of the incident electromagnetic field (such as frequency, intensity, direction, and the source of the electromagnetic field), the relative position of the target object, the genetic characteristics of typical tissues in the exposed human body, ground effects, and environmental influences. Currently, many countries and regions have established safety standards for human exposure to electromagnetic waves. For example, among internationally accepted standards, the European standard is less than 2.0 W / kg per 10 grams, and the US standard is less than 1.6 MW / g per gram.

[0029] Currently, the commonly used methods to reduce SAR values ​​are mainly as follows: (1) Directly reduce the antenna's transmission power to reduce the absorption of electromagnetic waves by the human body. However, it is difficult to guarantee the total radiated power (TRP) requirement when reducing the antenna's transmission power. If the TRP is too low, the communication quality will also be low, which usually cannot meet the increasingly high communication requirements in the market; (2) Reduce the antenna's transmission power according to the scenario. Using a human tissue detection device (SAR SENSOR), the transmission power is reduced only when the human body is close to the electronic device. However, it is also difficult to guarantee the total radiated power requirement; (3) Use a power divider to transmit the antenna's transmission power through multiple antennas. However, the current development trend of electronic devices is to make them thinner and thinner, resulting in smaller and smaller antenna space, making it difficult to provide space for additional antennas; (4) Add a grounding branch under the antenna floor to make the current distribution on the antenna more uniform. However, this solution is only for FPC antennas and is not suitable for electronic devices with metal frames, which has great limitations. It can be seen that, as of now, there is still no good solution that can effectively reduce the SAR of the antenna.

[0030] Therefore, in response to the aforementioned problems, the inventors of this application, after extensive and repeated research, discovered that the SAR hotspots of current electronic device antennas are primarily concentrated in areas with strong current distribution on the radiator; that is, the higher the current density on the radiator, the greater the corresponding SAR value. In response, the inventors propose the antenna device of this application and an electronic device incorporating the antenna device. The antenna device includes a first radiator and a second radiator connected to the first radiator. The first radiator includes a first connection terminal, a second connection terminal, and a feed point and a ground point disposed between the first connection terminal and the second connection terminal. The feed point is used to connect to a feed source, and the distance between the ground point and the second connection terminal is greater than the distance between the feed point and the second connection terminal. The second radiator is electrically connected to the first connection terminal. The first radiator supports a first frequency band, and the second radiator supports a second frequency band. The first and second frequency bands are different. When the first radiator supports the first frequency band, the excitation current input through the feed point is distributed across the first and second radiators. The excitation current corresponding to the signal of the first frequency band is shunt by the first and second radiators, which can improve the current distribution of the first radiator. This can, to a certain extent, balance the current concentration of the antenna device, thereby effectively reducing the overall SAR value of the antenna device. Therefore, the antenna device provided in this application embodiment has a low SAR value.

[0031] The antenna device and electronic equipment proposed in this application will be further described below with reference to specific embodiments and illustrative drawings.

[0032] Please see Figure 1 This application provides an antenna device 100, which includes a radiator 10 and a feed circuit 30 connected to the radiator 10. The radiator 10 is used to receive and transmit radio frequency signals, and the feed circuit 30 is used to feed an excitation current into the radiator 10, enabling the radiator 10 to resonate and radiate radio frequency signals. The feed circuit 30 is adapted to be connected to the motherboard of an electronic device and can be controlled by the motherboard of the electronic device.

[0033] The radiator 10 includes a first radiator 12 and a second radiator 14, which are electrically connected. In the embodiments of this application, the electrical connection between the first radiator 12 and the second radiator 14 is achieved through a direct physical connection, for example, the two are directly connected through a physical structure. For the sake of simplicity, the radiator 10 (including the first radiator 12 and the second radiator 14, etc.) in the accompanying drawings of this specification is represented as a simple geometric shape (such as a strip). However, it is understood that each part of the radiator 10 may actually have a certain width; similarly, each part of the radiator 10 is presented as a relatively straight structure in the figures. However, in practice, in order to avoid parts such as microphone holes, headphone jacks, and receiver holes of electronic devices, each part of the radiator 10 may have certain bends or features such as holes and notches. The specific shape of the actual radiator 10 should not be limited by the drawings provided in the embodiments of this application.

[0034] In this embodiment, the radiator 10, including the first radiator 12 and the second radiator 14, can be a single-piece antenna radiator. The first radiator 12 and the second radiator 14 can be made of the same material, or there may be no clear boundary between them. In some embodiments, the structures of the first radiator 12 and the second radiator 14 may even have a relatively clear boundary. Further, in this embodiment, the first radiator 12 can be any one of a flexible circuit board radiator, a laser-formed radiator, a printed-formed radiator, or a metal radiating branch. The second radiator 14 can also be any one of a flexible circuit board radiator, a laser-formed radiator, a printed-formed radiator, or a metal branch. The materials or forming methods of the first radiator 12 and the second radiator 14 can be the same or different, and this application does not impose any restrictions on this.

[0035] In this embodiment, the first radiator 12 supports a first frequency band and includes a first connection terminal 122, a second connection terminal 124, a feed point 127, and a ground point 129. The first connection terminal 122 and the second connection terminal 124 are spaced apart from each other; for example, the first connection terminal 122 and the second connection terminal 124 are located at spaced-apart positions on the first radiator 12 (e.g., at opposite ends of the first radiator 12). The feed point 127 and the ground point 129 are disposed between the first connection terminal 122 and the second connection terminal 124. It should be understood that the "between" position scheme described in this specification, "one element A is disposed between two other elements B and C," should include the endpoints (refer to the case where the numerical range includes the endpoint values). For example, if element A is disposed between elements B and C, it can include the following situations: element A is located at the position between elements B and C; element A is located on element B; element A is located on element B. It should be understood that, in the embodiments of this application, a certain element includes an "end" portion. The "end" portion can be understood as a part that occupies a certain physical space and is located in the end region of the element. For example, the "end" portion can be a part of the extended end of the element. If the "end" portion has a certain extension dimension, its extension dimension can be no more than half of the overall extension dimension of the element. For another example, the "end" portion can also be the end face or end line of the extended end of the element. Even more, the "end" portion can be the end of a certain part of the element, and another part of the element can also be connected to the end, so that the end does not have obvious extended end, end line or end face structure.

[0036] Feed point 127 is used to connect the feed source in the feed circuit 30. Feed point 127 is located on the first radiator 12 at a position relatively close to the second radiator 14, such that the distance between feed point 127 and the second connection terminal 124 is greater than the distance between feed point 127 and the first connection terminal 122.

[0037] Grounding point 129 is spaced apart from feed point 127. Grounding point 129 is located on the first radiator 12 at one end relatively close to the second radiator 14. The distance between grounding point 129 and the second connection terminal 124 is greater than the distance between feed point 129 and the second connection terminal 124. That is, grounding point 129 is farther away from the second connection terminal 124 than feed point 127, and grounding point 129 is closer to the first connection terminal 122 than feed point 127. In some examples, grounding point 129 may be located at the first connection terminal 122.

[0038] Furthermore, in some examples, the grounding point 129 can be grounded via an inductor (not shown in the figure). The location of the grounding point 129 on the first radiator 12 adjacent to the feed point 127 allows the first radiator 12 to substantially form an IFA (Inverted-FAntenna) antenna structure, resulting in better impedance matching of the first radiator 12, and also offering advantages such as smaller size, simpler structure, and lower manufacturing cost. In some embodiments, such as... Figure 1 In the illustrated embodiment, the grounding point 129 can be spaced apart from the feed point 127 on the first radiator 12, but the distance between them is limited to a specified range. For example, the distance between the grounding point 129 and the feed point 127 should be less than or equal to 5 mm, thereby ensuring that the inductance introduced into the first radiator 12 by the grounding point 129 is small, resulting in better impedance matching performance of the first radiator 12. The specific grounding form of the grounding point 129 can be implemented by a structure such as a grounding spring, and the specific structural form of the feed point 127 can also be implemented by a structure such as a feed spring; this application does not impose any limitations on this.

[0039] Furthermore, the first radiator 12 may also include a first main body 121, with a first connecting end 122 and a second connecting end 124 located at opposite ends of the first main body 121. In this embodiment, the first connecting end 122, the first main body 121, and the second connecting end 124 are arranged sequentially along a first direction X, such that the structure of the first connecting end 122, the first main body 121, and the second connecting end 124 of the first radiator 12 is generally a straight strip extending along the first direction X. The feed point 127 may be located on the first main body 121 or the first connecting end 122; similarly, the grounding point 129 may also be located on the first main body 121 or the first connecting end 122.

[0040] The second radiator 14 supports a second frequency band, which is different from the first frequency band. The second radiator 14 is connected to the first connection terminal 122 of the first radiator 12. In this embodiment, the second radiator 14 is not grounded, and the feed circuit 30 is configured to input an excitation current to the first radiator 12 via the feed point 127, so that the first radiator 12 radiates the signal of the first frequency band. When the first radiator 12 radiates the signal of the first frequency band, the excitation current is distributed on the first radiator 12 and the second radiator 14. Therefore, the excitation current corresponding to the first frequency band on the first radiator 12 is shunt by the second radiator 14, which can balance the current concentration of the antenna device 100 to a certain extent, so that the SAR value of the antenna device 100 is relatively low.

[0041] In this embodiment, the extension direction of the second radiator 14 from the first connecting end 122 is different from the extension direction of the first radiator 12 from the first connecting end 122. In this specification, the "extension direction" of the radiator can be understood as the direction in which the radiator extends from the first connecting end 122, and its direction is defined by the structure of the radiator itself. For example, the second radiator 14, the first connecting end 122, and the first main body 121 are arranged sequentially in the first direction, such that the extension direction of the second radiator 14 from the first connecting end 122 is opposite to the extension direction of the first radiator 12 from the first connecting end 122, that is, as shown... Figure 1 In the illustrated embodiment, the first radiator 12 extends along the positive direction of the first direction X, and the second radiator 14 extends along the negative direction of the first direction X. Alternatively, in other examples, the angle between the extension direction of the second radiator 14 from the first connection end 122 and the extension direction of the first radiator 12 from the first connection end 122 is an obtuse angle. Further, in this embodiment, the second radiator 14 is connected to the end of the first radiator 12 that has a grounding point 129 (e.g., the first connection end 122), but the second radiator 14 itself does not have a grounding point. That is, the second radiator 14 is not grounded itself; the current flowing back onto it is grounded through the grounding point of the first radiator 12. This ensures that the second radiator 14 and the first radiator 12 can shunt the excitation current, thereby reducing the SAR value.

[0042] It should be understood that the specific structures of the first radiator 12 and the second radiator 14 in this application are not limited, as long as the second radiator 14 is a branch connected to the first radiator 12, and can be electrically connected to the feed point 127 to achieve current shunting while ensuring the original radiation frequency band of the first radiator 12. For example, the first radiator 12 or the second radiator 14 can be extended to a corresponding length and bent accordingly to form an antenna of the corresponding type. In this embodiment, the type can be selected according to the specific application scenario, for example, it can be a G-type antenna or a planar inverted F antenna. For another example, the first radiator 12 can include multiple radiation regions. By setting the length and structural shape of the multiple radiation regions to different parameters, different current paths can be formed to form a radiator that can resonate with multiple signal frequency bands (e.g., 824-894MHz, 1710-2170MHz, 2300MHz-2690MHz, etc.). It should be understood that in the embodiments of this application, "multiple" should be understood as two or more. Unless otherwise specified, the operating frequency bands of the first radiator 12 and the second radiator 14 will be described below.

[0043] In this embodiment, the first radiator 12 can be used to transmit and / or receive signals in at least one operating frequency band, such as Long Term Evolution (LTE) signals. The operating frequency band of the signal radiated by the first radiator 12 may include at least one LTE frequency band, such as B1 band (1.92GHz-2.17GHz), B3 band (1.71GHz-1.88GHz), B2 band (1.85GHz-1.99GHz), B5 band (0.824GHz-0.894GHz), B8 band (0.88GHz-0.96GHz), B28 band (0.703GHz-0.803GHz), B40 band (2.30GHz-2.40GHz), B41 band (2.496GHz-2.690GHz), B7 band (2.50GHz-2.69GHz), etc. The signal radiated by the first radiator 12 can also be a New Radio (NR) signal, and its operating frequency band can also include at least one NR band, such as the N1 band (1.92GHz-2.17GHz), the N2 band (1.85GHz-1.99GHz), etc. In the embodiments of this application, the frequency band supported by the first radiator 12 can cover at least one of the above-mentioned operating frequency bands. For example, the frequency band range supported by the first radiator 12 can cover the frequency band range of multiple operating frequency bands, such as covering the frequency band ranges of B1, B3 / N3 and B5 / N5 bands. Then the first radiator 12 can transmit and / or receive signals of the B1, B3 / N3 or B5 / N5 frequency bands.

[0044] The second radiator 14 can be used to transmit and / or receive signals in at least one operating frequency band, which may include at least one frequency band of LTE, such as the B1 band, B2 band, B3 band, B7 band, etc., mentioned above. It should be understood that the first radiator 12 and the second radiator 14 can support one or more operating frequency bands for signals.

[0045] In this embodiment, the second frequency band supported by the second radiator 14 is different from the first frequency band supported by the first radiator 12. It should be understood that, in this embodiment, "different" means that the frequency ranges of the two frequency bands are not completely the same. For example, the frequency ranges of the two frequency bands can be completely different (e.g., they have no overlap), or the frequency ranges of the two frequency bands can partially overlap (e.g., there is an overlap between them, and at least a portion of the frequencies of one frequency band are within the range of the other frequency band).

[0046] In some embodiments, the first frequency band may be lower than the second frequency band. It should be understood that "the first frequency band is lower than the second frequency band" means that the frequency range of the first frequency band is lower than the frequency range of the second frequency band; for example, the highest frequency of the first frequency band is lower than the lowest frequency of the second frequency band. In some embodiments, the first frequency band may be a mid-frequency band, for example, the first frequency band may include at least one of the B1 and B3 frequency bands mentioned above; the second frequency band may be a high-frequency band, for example, the second frequency band may include the B7 frequency band mentioned above. It should be understood that the first frequency band in the embodiments of this application should not be strictly limited to the intermediate frequency band. For example, the first frequency band may cover the intermediate frequency band, or the center frequency of the first frequency band may be within the intermediate frequency band (e.g., the center frequency of the first frequency band is within the frequency band range of 1.7-2.2 GHz), or the first frequency band and the intermediate frequency band may have overlapping frequency band ranges. This means that the upper limit of the frequency band range of the first frequency band may be slightly offset relative to the upper limit of the intermediate frequency band (e.g., the upper limit of the frequency band range of the first frequency band may be slightly greater than or slightly less than the upper limit of the intermediate frequency band), and the lower limit of the frequency band range of the first frequency band may be slightly offset relative to the lower limit of the intermediate frequency band (e.g., the lower limit of the frequency band range of the first frequency band may be slightly greater than or slightly less than the lower limit of the intermediate frequency band).

[0047] In some embodiments, the frequency ranges of the first frequency band and the second frequency band may not be exactly the same, or may be completely different. For example, the frequency ranges of the first frequency band and the second frequency band may have no overlap at all, or their frequency ranges may partially overlap.

[0048] Furthermore, in this embodiment, the first radiator 12 can also be used to support a third frequency band, which can be lower than the first frequency band. It should be understood that "the third frequency band is lower than the first frequency band" means that the frequency range of the third frequency band is lower than the frequency range of the first frequency band; for example, the highest frequency of the third frequency band is lower than the lowest frequency of the first frequency band. In some embodiments, the first frequency band can be a mid-frequency band, for example, the first frequency band can include at least one of the B1 and B3 frequency bands mentioned above; the third frequency band can be a low-frequency band, for example, the third frequency band can include at least one of the B5, B8, and B28 frequency bands mentioned above.

[0049] Furthermore, in this embodiment, the second radiator 14 can also be used to support a fourth frequency band, which may be lower than the second frequency band. "The fourth frequency band is lower than the second frequency band" means that the frequency range of the fourth frequency band is lower than the frequency range of the second frequency band; for example, the highest frequency of the fourth frequency band is lower than the lowest frequency of the second frequency band. In some embodiments, the fourth frequency band can be a mid-frequency band; for example, the fourth frequency band may include at least one of the B1 and B3 frequency bands described above. It should be understood that the fourth frequency band in the embodiments of this application should not be strictly limited to the intermediate frequency band. For example, the fourth frequency band may cover the intermediate frequency band, or the center frequency of the fourth frequency band may be within the intermediate frequency band (e.g., the center frequency of the fourth frequency band is within the frequency band range of 1.7-2.2 GHz), or the fourth frequency band and the intermediate frequency band may have overlapping frequency band ranges. This means that the upper limit of the frequency band range of the fourth frequency band may be slightly offset relative to the upper limit of the intermediate frequency band (e.g., the upper limit of the frequency band range of the fourth frequency band may be slightly greater than or slightly less than the upper limit of the intermediate frequency band), and the lower limit of the frequency band range of the fourth frequency band may be slightly offset relative to the lower limit of the intermediate frequency band (e.g., the lower limit of the frequency band range of the fourth frequency band may be slightly greater than or slightly less than the lower limit of the intermediate frequency band).

[0050] Furthermore, to support the aforementioned first frequency band, the first radiator 12 is configured to operate in the corresponding resonant mode; and to support the aforementioned second frequency band, the second radiator 14 is configured to operate in the corresponding resonant mode. For example, the first radiator 12 can operate in the first resonant mode, and the second radiator 14 can operate in the second resonant mode, wherein the first resonant mode indicates that the first radiator 12 generates resonance in the first frequency band, and the second resonant mode indicates that the second radiator 14 generates resonance in the second frequency band.

[0051] Specifically, a first current path is formed on the first radiator 12 by current excitation. For example, the first current path is formed on the first radiator 12 from the feed point 127 to the second connection terminal 124. The higher-order modes of the first current path are used to form a first resonant mode to radiate signals in a first frequency band. For example, the first radiator 12 has a suitable equivalent electrical length, enabling the first current path to form a resonance of 1 / 2 wavelength mode, or a resonance of 3 / 4 wavelength mode, or a resonance of 5 / 8 wavelength mode, or a resonance of 5 / 4 wavelength mode (i.e., the first resonant mode) in the first frequency band, where the first frequency band can be a mid-frequency band. Further, the fundamental mode of the first current path is used to form a third resonant mode, enabling the first radiator 12 to radiate signals in a third frequency band. For example, the equivalent electrical length of the first radiator 12 enables the first current path to form a resonance of 1 / 4 wavelength mode (i.e., the third resonant mode) in the third frequency band, where the third frequency band can be a low-frequency band.

[0052] In this embodiment, the first radiator 12 can be configured with a suitable equivalent electrical length so that it can operate in the aforementioned first resonant mode without the need for additional impedance elements. For example, the physical length of the first radiator 12 can be designed within a suitable range to configure its equivalent electrical length. Specifically, the physical length of the first radiator 12 can be equal to one-half, three-quarters, or four-fifths of the wavelength of the first frequency band, thereby making the first resonant mode the corresponding 1 / 4 wavelength mode, 3 / 4 wavelength mode, or 3 / 4 wavelength mode. Alternatively, a suitable impedance element can be introduced into the circuit of the first radiator 12 to configure its equivalent electrical length; these details will not be elaborated upon further in this specification.

[0053] Furthermore, in this embodiment, to ensure that the first radiator 12 can support the first frequency band and the third frequency band, the antenna device 100 may also include a frequency band selection circuit 50. One end of the frequency band selection circuit 50 is grounded, and the other end is connected to the first radiator 12. The frequency band selection circuit 50 is configured to be connected to the loop of the antenna device 100 using different impedance elements, so that the first radiator 12 can switchably radiate radio frequency signals of different frequency bands. Specifically, the frequency band selection circuit 50 may be connected to the portion of the first radiator 12 from the feed point 127 to the second connection end 124 (such as the first main body 121), and it is used to adjust the equivalent electrical length of the first radiator 12 so that the first radiator 12 supports the first frequency band or the third frequency band. In this embodiment, the frequency band selection circuit 50 may include multiple parallel regulating inductors L1. The frequency band selection circuit 50 is configured to connect at least one of the multiple regulating inductors L1 into the loop of the first radiator 12 to adjust the equivalent electrical length of the first radiator 12, so that the first radiator 12 supports multiple sub-bands of the third frequency band. When the third frequency band is a low-frequency band, its frequency range can be 0.703GHz to 0.894GHz, and its sub-bands may include B5 (uplink band 0.824~0.849GHz, downlink band 0.869~0.894GHz), B8 (uplink band 0.880~0.915GHz, downlink band 0.925~0.960GHz), and B28 (uplink band 0.703~0.748GHz, downlink band 0.758~0.803GHz). In this embodiment, the first radiator 12 may also be grounded through the frequency band selection circuit 50.

[0054] A second current path is formed on the second radiator 14 by an excitation current. For example, a second current path is formed from the feed point 127 to the end of the second radiator 14. The higher-order modes of the second current path are used to form a second resonant mode to radiate signals in the second frequency band. For example, the second radiator 14 has a suitable equivalent electrical length so that the second current path can form a resonance of 1 / 2 wavelength mode, or a resonance of 3 / 4 wavelength mode, or a resonance of 5 / 8 wavelength mode, or a resonance of 5 / 4 wavelength mode (i.e., a second resonant mode) in the second frequency band, where the second frequency band can be a high-frequency band. Furthermore, the fundamental mode of the second current path is used to form a fourth resonant mode, which characterizes the ability of the second radiator 14 to generate resonance in the fourth frequency band, so that the second radiator 14 can radiate signals in the fourth frequency band. For example, the equivalent electrical length of the second radiator 14 enables the second current path to form a quarter-wavelength mode resonance (i.e., the fourth resonant mode) in the fourth frequency band, where the fourth frequency band can be a mid-frequency band, or the center frequency of the fourth frequency band is within the frequency range of 1.7-2.2 GHz. Furthermore, the third frequency band is lower than the first frequency band and lower than the fourth frequency band.

[0055] In some embodiments of this application, the fourth frequency band may be substantially the same as the first frequency band, that is, the operating frequency bands of the signals that the first radiator 12 and the second radiator 14 can use to transmit and / or receive may be substantially the same. In this case, the excitation current from the feed is shunt by the first radiator 12 and the second radiator 14, thereby reducing the current peak on the radiator 10 and optimizing its electric field distribution, which is beneficial for reducing the SAR value of the antenna device 100. It should be understood that, in this case, the number of operating frequency bands of the signals that the first radiator 12 and the second radiator 14 can support may be one or more. For example, if the fourth frequency band is the same as the first frequency band, both may be 1.7 GHz to 2 GHz, and this frequency band range covers the frequency range of the B1 / B3 band, then both the first radiator 12 and the second radiator 14 can support signals operating in the B1 / B3 band.

[0056] For example, in some examples, both the fourth frequency band and the first frequency band are intermediate frequency bands. When the excitation current fed through the feed point 127 excites the first radiator 12 to generate resonance in the first frequency band, the second radiator 14 generates resonance in the fourth frequency band to disperse the current distribution on the first radiator 12 corresponding to the first frequency band. Therefore, the first radiator 12 and the second radiator 14 can jointly radiate signals in the intermediate frequency band. While the radiation efficiency is high, the excitation current corresponding to the intermediate frequency band is shunted by the first radiator 12 and the second radiator 14, which can balance the current concentration of the radiator 10 to a certain extent. The overall SAR value of the antenna device 100 is relatively low.

[0057] For example, in some examples, the frequency ranges of the fourth frequency band and the fourth frequency band may not be exactly the same. For instance, if the center frequency of the fourth frequency band is within the frequency range of the first frequency band, the second radiator 14 can resonate with respect to the first frequency band when the first radiator 12 radiates a signal of the first frequency band. Both can jointly radiate signals of at least a portion of the frequency band (i.e., signals of the first frequency band). This allows the current corresponding to the first frequency band on the first radiator 12 to be shunted by the second radiator 14, improving the current distribution of the first radiator 12. This, in turn, can balance the current concentration of the antenna device 100 to a certain extent, thereby effectively reducing the overall SAR value of the antenna device 100. It should be understood that the center frequency of the fourth frequency band being within the frequency range of the first frequency band can have several possible scenarios: the center frequency of the fourth frequency band is within the intermediate frequency band; or the center frequency of the fourth frequency band is within the first frequency band but not within the intermediate frequency band. In these cases, when the first radiator 12 radiates a signal in the first frequency band, the second radiator 14 can generate resonance with respect to the fourth frequency band, and the two can jointly radiate signals in at least a portion of the frequency band (i.e., signals in the first frequency band). The second radiator 14 can also shunt the current of the first radiator 12.

[0058] In this embodiment, the second radiator 14 can be configured with a suitable equivalent electrical length to enable it to operate in the aforementioned second resonant mode without the need for additional impedance elements. For example, the physical length of the second radiator 14 can be designed within a suitable range to configure its equivalent electrical length. Specifically, the physical length of the second radiator 14 can be equal to one-half, three-quarters, or four-fifths of the wavelength of the second frequency band, thereby resulting in the corresponding 1 / 2 wavelength mode, 3 / 4 wavelength mode, or 3 / 4 wavelength mode for the second resonant mode. Alternatively, a suitable impedance element can be introduced into the circuit of the second radiator 14 to configure its equivalent electrical length; these details will not be elaborated upon further in this specification.

[0059] The above embodiments of this application provide a possible structure for a radiator 10, in which the electrical connection between the first radiator 12 and the second radiator 14 is achieved through a direct physical connection, and the first radiator 12 is generally in a straight, extended form. This application also provides other embodiments in which the first radiator 12 has a bent radiating structure to adapt to the complex environment when applied in electronic devices and to ensure sufficient physical length. It should be understood that a bent radiating structure means that the structure is not straight, but has at least one bent corner. This structure can both increase the physical length of the antenna device 100 and reduce the coverage area of ​​the radiator 10.

[0060] Please see Figure 3 , Figure 3The diagram illustrates a possible structure of the radiator 10 in these embodiments. The first radiator 12 of the radiator 10 may further include a second main body 123 and a connecting part 125, based on the above embodiments.

[0061] In this embodiment, the second main body portion 123 and the first main body portion 121 are disposed at a distance from each other in the second direction Y, and the second main body portion 123 is connected to the first main body portion 121 through a connecting portion 125. Further, both the first main body portion 121 and the second main body portion 123 are generally straight strips, and both are disposed approximately along the first direction X. The first direction X intersects the second direction Y, and the included angle between them can be greater than or equal to 45 degrees. In this embodiment, the first direction X and the second direction Y can be perpendicular to each other, so the second main body portion 123 can be disposed approximately parallel to each other.

[0062] A connecting portion 125 is disposed at the end of the first main body 121 away from the second radiator 14, and is connected to the second connecting end 124. Figure 3 In the illustrated embodiment, the connecting portion 125 is generally strip-shaped and extends generally along the second direction Y. The connecting portion 125 connects the first main body portion 121 and the second main body portion 123. When the second main body portion 123 and the first main body portion 121 are arranged at intervals relative to each other in the second direction Y, the overall structure of the radiator 10 has a relatively compact "U"-shaped arrangement, which ensures that the radiator 10 has a small coverage area while having sufficient physical length.

[0063] In this embodiment, the second radiator 14 is generally strip-shaped. The second radiator 14 and the first main body 121 extend along the first direction X, and the extension direction of the second radiator 14 from the first connecting end 122 is opposite to the extension direction of the first main body 121 from the first connecting end 122.

[0064] Further, the second main body 123 includes a first corresponding segment 1231 and a second corresponding segment 1233. The first corresponding segment 1231 is spaced apart from the first main body 121 (e.g., they are approximately parallel to each other), and the second corresponding segment 1233 is spaced apart from the second radiator 14 (e.g., they are approximately parallel to each other). In this embodiment, the length of the second main body 123 extending along the first direction X and the length of the second radiator 14 extending along the first direction X can be determined by the frequency band range in which they are respectively configured. For example, the length of the second main body 123 extending along the first direction X is the same as the length of the second radiator 14 extending along the first direction X, or the length of the second main body 123 extending along the first direction X is greater than the length of the second radiator 14 extending along the first direction X, or the length of the second main body 123 extending along the first direction X is less than the length of the second radiator 14 extending along the first direction X. This is to ensure that the first radiator 12 has sufficient physical length so that the first radiator 12 can operate in a specified frequency band (e.g., a low-frequency band).

[0065] In this embodiment, the power supply circuit 30 may include a feed source 32 and a matching circuit 34. The matching circuit 34 is connected between the feed source 32 and the first main body 121. The matching circuit 34 feeds a current signal to the first radiator 12 through the feed point 127 so that the first radiator 12 radiates a signal in the first frequency band.

[0066] Please see Figure 4 In some specific examples, the radiator 10 provided in the embodiments of this application can be in the following form: Figure 4 As shown in the diagram of the frame antenna, the radiator 10 has an irregular, curved shape with a notch, which helps to avoid locations such as microphone holes, headphone jacks, and receiver holes in electronic devices. Although the specific shape of the radiator 10 shown in this embodiment differs from that of the radiator 10 in the previous embodiment, it should be understood that the components, extensions, and orientations of the radiator 10 in this embodiment all encompass the features of the radiator 10 in the previous embodiment. Figure 4 The specific structure of the radiator 10 shown should not be construed as a limitation of this scheme.

[0067] Please see Figure 5 , Figure 5 A conventional antenna and Figure 4The illustrated embodiment shows a schematic diagram of the S-parameters of the antenna device 100. As can be seen from the diagram, the antenna device 100 provided in this application generates a higher frequency band resonance (resonance point 4) compared to conventional antenna devices. This resonance point 4 corresponds to the resonance of the second radiator in the second frequency band (high frequency). Further, resonance point 3 in the diagram represents the resonance of the antenna device 100 in the third frequency band (low frequency), and resonance point 5 represents the resonance of the antenna device 100 in the first or fourth frequency band (intermediate frequency).

[0068] Please see Figure 6 and Figure 7 , Figure 6 and Figure 7 A conventional antenna and Figure 4 The grayscale and black-and-white images of the current distribution diagram simulated by the structure of the antenna device 100 in the illustrated embodiment represent the radiated electric field intensity when the resonant frequency of the antenna device 100 is in the B1 / B3 frequency band. Figure 6 and Figure 7 Figure (A) shows that traditional radiators do not have a second radiator, and the current concentration point on the first radiator is more obvious. For example, there is a strong current concentration point in the approximate middle position of the second main body. Figure 6 and Figure 7 As shown in Figure (B), since the first radiator 12 is shunt by the second radiator 14 in the radiator 10 provided in this application, the current of the original higher-order mode (B1 / B3) flows to the second radiator 14, which significantly reduces the concentration of current concentration points (such as the second main body 123) on the first radiator 12. It can be seen that the current distribution of the first radiator 12 of the antenna device 100 provided in this application embodiment is more uniform, and thus the antenna device 100 can realize the SAR reduction function.

[0069] Please see Figure 8 and Figure 9 , Figure 8 and Figure 9 The figures show grayscale and black-and-white images illustrating the radiation efficiency of a conventional antenna and an antenna device 100 provided in some embodiments of this application. As can be seen from the figures, compared to an antenna with a conventional radiator, the antenna efficiency of the antenna device 100 provided in this application embodiment does not change significantly. Therefore, by providing a first radiator 12 and a second radiator 14, the antenna device 100 can shunt the excitation current in frequency bands where SAR reduction is required, improving the electric field distribution of the antenna device 100. This results in a relatively low maximum electric field radiation intensity in the frequency bands where SAR reduction is required, while the overall average radiation value remains unchanged, and the antenna device 100 still possesses high radiation efficiency.

[0070] Please see Figure 10 and Figure 11 , Figure 10 and Figure 11 The diagram shows the SAR value per 10 grams of body for a conventional antenna and an antenna device 100 provided in some embodiments of this application. This represents the peak SAR value when the resonant frequency of the antenna device 100 is in the B3 band (1.785 GHz). In the structure of the antenna device 100 provided in this application, it includes at least a first radiator 12 and a second radiator 14, with a corresponding SAR peak value of 0.655533 W / ka. Compared to a conventional radiator antenna structure, this SAR peak value is reduced by 43%. Therefore, the antenna device 100 provided in the embodiments of this application can achieve a significant SAR reduction function.

[0071] In the radiator 10 provided in the above embodiments of this specification, the first radiator 12 and the second radiator 14 extend in opposite directions, thereby achieving a uniform electric field distribution. It should be understood that in other embodiments, the second radiator 14 and the first main body 121 may extend in different directions. For example, please refer to... Figure 12 ,exist Figure 12 In the embodiment shown, the angle A between the second radiator 14 and the first main body 121 of the first radiator 12 is greater than 90 degrees, which can achieve a uniform electric field distribution while avoiding current cancellation that would weaken the radiation efficiency.

[0072] In other embodiments, the second radiator 14 may also be a bent structure connected to the first main body portion 121. For example, the second radiator 14 may include at least one straight portion and at least one bent portion. Specifically, please refer to... Figure 13 The second radiator 14 may include a first straight portion 141, a second straight portion 143, a third straight portion 145, and a bent portion 147. The first straight portion 141 is connected to the first main body portion 121 or the first connecting end 122. The second straight portion 143 and the third straight portion 145 are respectively disposed on opposite sides of the first straight portion 141 and are spaced apart from the first straight portion 141 (e.g., parallel to each other). The bent portion 147 is connected to the end of the first straight portion 141, the second straight portion 143, and the third straight portion 145 away from the first main body portion 121. This structure forms an "E"-shaped second radiator 14, which can meet the multi-band requirements of the second radiator 14. It can increase the physical length of the radiator 10, enabling the second radiator 14 to support low-frequency, mid-frequency, and high-frequency bands, and can also reduce the coverage area of ​​the radiator 10.

[0073] The antenna device provided in this application includes a first radiator and a second radiator connected to the first radiator. The first radiator includes a first connection terminal, a second connection terminal, and a feed point and a ground point disposed between the first connection terminal and the second connection terminal. The feed point is used to connect to a feed source, and the distance between the ground point and the second connection terminal is greater than the distance between the feed point and the second connection terminal. The second radiator is electrically connected to the first connection terminal. The first radiator is used to support a first frequency band, and the second radiator is used to support a second frequency band. The first frequency band and the second frequency band are different. When the first radiator supports the first frequency band, the excitation current input through the feed point is distributed on the first and second radiators. The excitation current corresponding to the signal of the first frequency band is shunt by the first and second radiators, which can improve the current distribution of the first radiator, thereby balancing the current concentration of the antenna device to a certain extent, and thus effectively reducing the overall SAR value of the antenna device. Therefore, the antenna device provided in this application has a low SAR value.

[0074] Please see Figure 14 This application also provides an electronic device 200, which can be, but is not limited to, electronic devices such as mobile phones, tablets, and smartwatches. The electronic device 200 in this embodiment is described using a mobile phone as an example.

[0075] In embodiments of this application, the electronic device 200 may further include a housing 1001, a display screen 1003 disposed on the housing 1001, and an antenna device 1004. The display screen is connected to the housing 1001, and the antenna device 1004 is integrated into the housing 1001.

[0076] In some implementations, the display typically includes a display panel, and may also include circuitry for responding to touch operations on the display panel. The display panel may be a liquid crystal display (LCD), and in some embodiments, the display panel may also be a touch display.

[0077] Specifically, in the embodiments of this application, the housing 1001 includes a rear housing 1010 and a middle frame 1011, with the rear housing 1010 and the display screen respectively disposed on opposite sides of the middle frame 1011.

[0078] Please see Figure 15The middle frame 1011 can be a one-piece molded structure, which can be structurally divided into a support portion 1012 and a frame 1013 surrounding the support portion 1012. It should be understood that the designations "support portion 1012" and "frame 1013" are merely for ease of description; the diagonal lines filling the structure in the diagram are only for differentiation and do not represent their actual structures. There may be no clear dividing line between them, and they may be two or more components assembled together. The naming of "support portion 1012" and "frame 1013" should not limit the structure of the middle frame 1011. The support portion 1012 supports a part of the display screen structure and can also support or install electronic components of the electronic device 200, such as the motherboard 1005, battery 1006, sensor module 1007, etc. The frame 1013 is connected to the periphery of the support portion 1012. Furthermore, the frame 1013 is arranged around the outer periphery of the support portion 1012 and protrudes relative to the surface of the support portion 1012, so that the two together form a space for accommodating electronic components. In this embodiment, the display screen is covered by the frame 1013, and the frame 1013, the back cover 1010 and the display screen together form the outer surface of the electronic device 200.

[0079] In this embodiment, the antenna device 1004 can be any of the antenna devices 100 provided in the above embodiments, or it can be a combination of any one or more features of the antenna devices 100. The relevant features can be referred to in the foregoing embodiments, and will not be repeated in this embodiment.

[0080] In some embodiments, the antenna device 1004 is integrated into the housing 1001. For example, the antenna device 1004 may be disposed in the middle frame 1011 or in the rear housing 1010, and this specification does not limit this. Similar to the aforementioned antenna device, the antenna device 100 of this embodiment may include a first radiator 12 and a second radiator 14, both of which may be disposed in the middle frame 1011 or the rear housing 1010.

[0081] Furthermore, in Figure 15In the illustrated embodiment, the frame 1013 is at least partially made of metal, and the antenna device 1004 is integrated into the frame 1013. In this embodiment, the frame 1013 includes at least a partially metal structure, which forms the radiator 10. Thus, using the metal frame 1013 as part of the radiator 10 of the antenna device 1004 helps save space within the electronic device 200 and provides a larger clearance area for the antenna device 1004, which helps ensure higher radiation efficiency. In some embodiments, the radiator 10 can be a flexible circuit board antenna radiator, a laser-formed antenna radiator, or a printed circuit antenna radiator. Alternatively, the radiator 10 can be a metal branch that can be directly attached to the surface of 1013. Further, in this embodiment, the frame 1013 may include a top frame 1017 and a bottom frame 1019, which are respectively disposed at opposite ends of the support portion 1012, thus the top frame 1017 and the bottom frame 1019 are substantially opposite to each other. The radiator 10 described above can be integrated into at least one of the top bezel 1017 and the bottom bezel 1019. In application, the top bezel 1017 and the bottom bezel 1019 are located at the top and bottom of the electronic device 200, respectively. Therefore, when the radiator 10 can be integrated into at least one of the top bezel 1017 and the bottom bezel 1019, the antenna device 1004 serves as the top antenna and / or bottom antenna of the electronic device 200, generating a lower SAR value, which is more beneficial to human health. It should be understood that the above-mentioned "top" and "bottom" are based on the normal usage state of the electronic device 200. For example, when the electronic device 200 is placed vertically along its length and the display screen 1003 faces the user, the end of the electronic device farther from the ground is considered the "bottom," and the other end is considered the "top."

[0082] Please see Figure 16 , Figure 16 An antenna device 100 is shown in one embodiment of this application (e.g., Figure 8-11 The illustrated embodiment shows a schematic diagram of the antenna device 100 integrated into the housing 1011. In this embodiment, the antenna device 100 is a flexible circuit board antenna attached to the bottom frame 1019 of the frame 1013. At least a portion of the structure of the radiator 10 extends along the structure of the bottom frame 1019 and has portions that bend along the corners of the bottom frame 1019 (such as the first extension 125 and the second extension 143).

[0083] The antenna device and electronic device provided in this application include a first radiator and a second radiator connected to the first radiator. The first radiator includes a first connection terminal, a second connection terminal, a feed point and a ground point disposed between the first connection terminal and the second connection terminal. The feed point is used to connect to a feed source, and the distance between the ground point and the second connection terminal is greater than the distance between the feed point and the second connection terminal. The second radiator is electrically connected to the first connection terminal. The first radiator is used to support a first frequency band, and the second radiator is used to support a second frequency band. The first frequency band and the second frequency band are different. When the first radiator supports the first frequency band, the excitation current input through the feed point is distributed on the first and second radiators. The excitation current corresponding to the signal of the first frequency band is shunt by the first and second radiators, which can improve the current distribution of the first radiator, thereby balancing the current concentration of the antenna device to a certain extent, and effectively reducing the overall SAR value of the antenna device. Therefore, the antenna device provided in this application has a low SAR value.

[0084] It should be noted that, in this specification, when a component is considered to be "disposed on" another component, it can be connected to or directly disposed on the other component, or there may be an intervening component (i.e., the two are indirectly connected). In the description of this specification, references to terms such as "one embodiment," "some embodiments," or "other embodiments" refer to specific features, structures, materials, or particulars described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, illustrative expressions of terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or particulars described can be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate features of different embodiments or examples described in this specification.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An antenna device, characterized in that, include: A first radiator includes a first connection end, a second connection end, a feed point, and a ground point. The feed point is located between the first connection end and the second connection end and is used to connect to the feed source. The distance between the ground point and the second connection end is greater than the distance between the feed point and the second connection end. The ground point of the first radiator is located at the first connection end. The second radiator is electrically connected to the first connection terminal. The second radiator does not have a grounding point for directly grounding the second radiator. The current on the second radiator flows back to the first radiator through the first connection terminal and is grounded through the grounding point provided at the first connection terminal. The first radiator is used to support a first frequency band, and the second radiator is used to support a second frequency band. The first frequency band and the second frequency band are different. When the first radiator supports the first frequency band, the excitation current input through the feed point is distributed on the first radiator and the second radiator.

2. The antenna device as claimed in claim 1, characterized in that, The first radiator includes a first main body, the first connecting end and the second connecting end are respectively located at both ends of the first main body, the feed point is disposed at the first main body or the first connecting end, and the second radiator, the first connecting end and the first main body are arranged sequentially in a first direction.

3. The antenna device as described in claim 2, characterized in that, The first radiator further includes a second main body and a connecting part. The second main body and the first main body are disposed at a distance from each other in a second direction. The connecting part is connected between the second connecting end and the second main body. The second direction is perpendicular to the first direction.

4. The antenna device as claimed in claim 1, characterized in that, The first radiator has a bent radiating structure. The first radiator includes a first main body. The first connecting end is located at one end of the first main body. The feed point and the grounding point of the first radiator are both located in the first main body or both located in the first connecting end. The second radiator and the first main body extend in different directions.

5. The antenna device as described in claim 4, characterized in that, The angle between the second radiator and the first main body is greater than 90 degrees.

6. The antenna device as claimed in claim 1, characterized in that, A first current path is formed on the first radiator by current excitation, and the higher-order modes of the first current path are used to form a first resonant mode. The first resonant mode characterizes the resonance of the first radiator in the first frequency band. The feed point to the end of the second radiator forms a second current path, which is used to form a second resonant mode. The second resonant mode characterizes the second radiator generating resonance in the second frequency band.

7. The antenna device as claimed in claim 6, characterized in that, The fundamental mode of the first current path is used to form a third resonant mode that is different from the first resonant mode. The third resonant mode characterizes the first radiator generating a third frequency band resonance, which is lower than the first frequency band.

8. The antenna device as claimed in claim 7, characterized in that, The higher-order modes of the second current path are used to form the second resonant mode, and the fundamental modes are used to form a fourth resonant mode that is different from the second resonant mode. The fourth resonant mode characterizes the second radiator generating a fourth frequency band resonance, which is lower than the second frequency band.

9. The antenna device as claimed in claim 8, characterized in that, The first frequency band and the fourth frequency band are intermediate frequency bands. When the excitation current excites the first radiator to generate resonance in the first frequency band, the second radiator generates resonance in the fourth frequency band to disperse the current distribution on the first radiator corresponding to the first frequency band.

10. The antenna device as claimed in claim 8, characterized in that, The third frequency band is lower than the first frequency band and lower than the fourth frequency band; or, The first frequency band and the fourth frequency band are mid-frequency bands, and the third frequency band is a low-frequency band; or, The center frequency of the first frequency band is within the frequency range of the intermediate frequency band; or, The center frequency of the first frequency band and the center frequency of the fourth frequency band are both within the frequency band range of 1.7-2.2 GHz.

11. The antenna device as claimed in claim 6, characterized in that, The equivalent electrical length of the second radiator enables the second radiator to operate in the second resonant mode.

12. The antenna device as claimed in claim 7, characterized in that, The antenna device further includes a frequency band selection circuit connected to the first radiator, the frequency band selection circuit being configured to adjust the equivalent electrical length of the first radiator so that the first radiator supports the first frequency band or the third frequency band.

13. The antenna device as claimed in claim 12, characterized in that, The frequency band selection circuit includes a plurality of parallel regulating inductors, and the frequency band selection circuit is configured to connect at least one of the plurality of regulating inductors into the loop of the first radiator to adjust the equivalent electrical length of the first radiator so that the first radiator supports multiple sub-bands of the third frequency band.

14. The antenna device as claimed in claim 1, characterized in that, The distance between the feed point and the second connection terminal is greater than the distance between the feed point and the first connection terminal; the distance between the grounding point of the first radiator and the second connection terminal is greater than the distance between the grounding point and the first connection terminal.

15. The antenna device according to any one of claims 1 to 14, characterized in that, The first radiator is any one of a flexible circuit board radiator, a laser direct forming radiator, a printed direct forming radiator, or a metal radiating branch; the second radiator is any one of a flexible circuit board radiator, a laser direct forming radiator, a printed direct forming radiator, or a metal branch.

16. An electronic device, characterized in that, The device includes a housing and an antenna device according to any one of claims 1 to 15, wherein the first radiator and the second radiator are integrated into the housing.

17. The electronic device as claimed in claim 16, characterized in that, The housing includes a support portion and a top frame and a bottom frame connected to the support portion. The top frame and the bottom frame are located at opposite ends of the support portion, and the first radiator and the second radiator are integrated into the top frame.

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