Electronic device

Abstract

The present application discloses an electronic device, comprising: a metal frame body and a second antenna radiator. A first side edge of the metal frame body is provided with a first break slit, a second side edge of the metal frame body is provided with a second break slit, and a part of the metal frame body between the first break slit and the second break slit forms a first antenna radiator, which is used to work in a first frequency band. The second antenna radiator is located on an inner side of the metal frame body, is disposed along the first side edge, and is used to work in a second frequency band. A coupling gap is provided between the second antenna radiator and the first antenna radiator. The first antenna radiator is provided with a first grounding point and a first feeding point, a radiator electrical length from the first feeding point to a first end being greater than an electrical length of the second antenna radiator. A radiator length from the first grounding point to the first end is less than a radiator length from the first feeding point to the first end. The first end is an end located at the first side edge, a second end is an end located at the second side edge, and the first side edge and the second side edge are adjacent to one another.

Description

An electronic device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411198918.1, filed in China on August 29, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of electronic product technology, and more particularly to an electronic device. Background Technology

[0004] In mobile communication electronic devices, due to space constraints, the layout of antennas across different frequency bands is often very compact. When two antennas are very close together, their mutual interference can lead to a decrease in antenna performance. Taking the antenna structure shown in Figure 1 as an example, antenna 1 operates in the first frequency band, antenna 2 operates in the second frequency band, the return point 3 of antenna 1 is located on the right side, and the feed and switch 4 are located in the middle. In this case, antenna 1 has a high specific absorption ratio (SAR), and antenna 1 may resonate near the power frequency of antenna 2 when it is operating, resulting in poor isolation between antenna 1 and antenna 2, and thus lower antenna performance. It is evident that current antenna designs in electronic devices suffer from low isolation between different antennas and high SAR values. Summary of the Invention

[0005] This application provides an electronic device to address the problems of low isolation between different antennas and high SAR values ​​in current electronic device antenna designs.

[0006] To solve the above-mentioned technical problems, this application is implemented as follows:

[0007] This application provides an electronic device, including:

[0008] A metal frame, wherein a first slit is formed on a first side of the metal frame, and a second slit is formed on a second side of the metal frame, and the portion of the metal frame between the first slit and the second slit forms a first antenna radiator; wherein the first antenna radiator is used to operate in a first frequency band, and the first side and the second side are arranged adjacent to each other.

[0009] The second antenna radiator is located inside the metal frame and is disposed along the first side; there is a coupling gap between the second antenna radiator and the first antenna radiator; wherein the second antenna radiator is used to operate in the second frequency band;

[0010] The first antenna radiator is provided with a first grounding point and a first feed point. The electrical length of the radiator from the first feed point to the first end of the first antenna radiator is greater than the electrical length of the second antenna radiator. The radiator length from the first grounding point to the first end is less than the radiator length from the first feed point to the first end. The first end is the end closest to the first gap.

[0011] Thus, in the above-described scheme of this application, the first antenna radiator is provided with a first grounding point and a first feed point, and the length of the radiator from the first grounding point to the first end is less than the length of the radiator from the first feed point to the first end. This means the first antenna radiator can be configured in IFA mode for operation in the first frequency band. Furthermore, since the first antenna radiator is formed by the metal frame portion between the first slit on the first side and the second slit on the second side of the metal frame, i.e., the first and second ends of the first antenna radiator are respectively open, the SAR energy can be distributed directly opposite the first end (i.e., away from the first side) and directly opposite the second end (i.e., away from the second side). This reduces the SAR maximum value by lowering the SAR energy on a single side of the electronic device. This scheme also avoids resonance at the frequency where the second antenna radiator operates by setting the electrical length of the radiator from the first feed point to the first end to be greater than the electrical length of the second antenna radiator. This reduces the influence of the first antenna radiator on the second antenna radiator, improves the isolation between the two antenna radiators, and thus improves antenna performance. Attached Figure Description

[0012] Figure 1 shows a schematic diagram of an antenna design scheme in the related technology;

[0013] Figure 2 shows a schematic diagram of the reflection coefficient curve of antenna 1 in Figure 1;

[0014] Figure 3 shows a schematic diagram of the reflection coefficient curve of antenna 2 in Figure 1;

[0015] Figure 4 shows a schematic diagram of the isolation between antenna 1 and antenna 2 in Figure 1;

[0016] Figure 5 shows a schematic diagram of the SAR energy distribution of antenna 1 in Figure 1;

[0017] Figure 6 is a schematic diagram of the antenna design scheme of the electronic device according to an embodiment of this application;

[0018] Figure 7 shows a schematic diagram of the reflection coefficient curve of the first antenna radiator according to an embodiment of this application;

[0019] Figure 8 shows a schematic diagram of the reflection coefficient curve of the second antenna radiator according to an embodiment of this application;

[0020] Figure 9 shows a schematic diagram of the isolation between the first antenna radiator and the second antenna radiator in an embodiment of this application.

[0021] Figure 10 shows a schematic diagram of the coupling current distribution between antenna 1 and antenna 2 in Figure 1;

[0022] Figure 11 shows a schematic diagram of the coupling current distribution of the first antenna radiator and the second antenna radiator according to an embodiment of this application;

[0023] Figure 12 shows a schematic diagram of the current distribution and SAR energy distribution of antenna 1 in Figure 1;

[0024] Figure 13 shows a schematic diagram of the current distribution and SAR energy distribution of the first antenna radiator according to an embodiment of this application. Detailed Implementation

[0025] Exemplary embodiments of the present application will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0026] As shown in Figure 1, which is a partial schematic diagram of the antenna design on the top of the electronic device, antenna 1 is an inverted-F (IFA) antenna mounted on the metal frame of the electronic device, operating in the mid-to-high frequency band (1.71 GHz to 2.7 GHz). When antenna 1 specifically operates in the B3 band (1.71 GHz to 1.88 GHz), its reflection coefficient curve is shown in Figure 2. Antenna 2 is a flexible printed circuit (FPC) antenna, operating in the N78 band (3.3 GHz to 3.8 GHz), and its reflection coefficient curve is shown in Figure 3.

[0027] A slit 5 is cut into the metal frame, forming the end (or opening) of antenna 1. Due to the return point 3 of antenna 1, and the positions of the feed and switch 4, the distance between the feed of antenna 1 and the slit 5 is close to the length of antenna 2. This causes antenna 1 to resonate in the N78 frequency band (3.3GHz~3.8GHz). For example, referring to Figure 2, the reflection coefficient curve of antenna 1 shows a deep reflection coefficient point in the 3.3GHz~3.8GHz range, at the same frequency as antenna 2. Therefore, antennas 1 and 2 significantly interfere with each other, and the isolation between them is very poor. For example, referring to the isolation diagram between antennas 1 and 2 shown in Figure 4, the isolation between them is only -4.5dB, leading to a decrease in antenna performance.

[0028] As shown in Figure 5, since antenna 1 adopts the IFA antenna form, the main SAR energy is distributed on the opposite side of the gap 5 (i.e., the direction indicated by the dashed arrow M in the SAR energy distribution in the partial schematic diagram of the antenna design on the top of the electronic device given in Figure 5). The SAR value is high. For example, the SAR values ​​of the B1 and B3 bands may exceed the specified standard values. The SAR value represents the electromagnetic radiation energy absorbed by a unit mass of human tissue. Once the specified standard value is exceeded, the antenna transmission power needs to be reduced to reduce the SAR value. This reason makes it impossible to fully utilize the antenna performance, resulting in a reduction in the actual antenna performance.

[0029] As shown in Figure 6, this application embodiment provides an electronic device, including:

[0030] A metal frame 10 has a first slit 101 on its first side and a second slit 102 on its second side. The portion of the metal frame between the first slit 101 and the second slit 102 forms a first antenna radiator 11. The first antenna radiator 11 is used to operate in a first frequency band, and the first side and the second side are arranged adjacent to each other.

[0031] The second antenna radiator 12 is located inside the metal frame 10 and is disposed along the first side; the second antenna radiator 12 and the first antenna radiator 11 have a coupling gap; wherein the second antenna radiator 12 is used to operate in the second frequency band;

[0032] The first antenna radiator 11 is provided with a first grounding point 111 and a first feed point 112. The electrical length of the radiator from the first feed point 112 to the first end of the first antenna radiator 11 is greater than the electrical length of the second antenna radiator 12. The radiator length from the first grounding point 111 to the first end is less than the radiator length from the first feed point 112 to the first end. The first end is the end of the first antenna radiator 11 that is close to the first gap 101.

[0033] For example, the first antenna radiator 11 and the second antenna radiator 12 can serve as carriers of radiated electromagnetic wave energy, wherein the first antenna radiator 11 operates in a first frequency band, and the second antenna radiator 12 operates in a second frequency band. The coupling interval between the first antenna radiator 11 and the second antenna radiator 12 means that the first antenna radiator 11 and the second antenna radiator 12 are not in contact, but can interact through spatial electromagnetic fields at a relatively close distance.

[0034] For example, the first antenna radiator 11 is formed by a portion of the metal frame 10 between a first slit 101 on the first side and a second slit 102 on the second side. That is, the first antenna radiator 11 is arranged along the first and second sides of the metal frame 10, or the first antenna radiator 11 is arranged along the first and second sides of the electronic device. For example, referring to the partial schematic diagram of the top antenna design of the electronic device shown in Figure 6, the first side can refer to the side of the metal frame 10 located at the top of the electronic device, and the corresponding second side is the side adjacent to the side of the metal frame 10 located at the top of the electronic device, such as the side located on the right side of the electronic device or the side located on the left side of the electronic device.

[0035] Optionally, the first antenna radiator 11 has a bent portion, and the portion of the radiator between the bent portion and the first end of the first antenna radiator 11 is arranged along the first side of the metal frame 10. For example, the portion of the radiator between the bent portion and the first end of the first antenna radiator 11 being arranged along the first side of the metal frame 10 can mean that the portion of the radiator between the bent portion and the first end of the first antenna radiator 11 is arranged along the extending direction of the first side of the metal frame 10. The portion of the radiator between the bent portion and the second end of the first antenna radiator 11 is arranged along the second side of the metal frame 10. For example, the portion of the radiator between the bent portion and the second end of the first antenna radiator 11 being arranged along the second side of the metal frame 10 can mean that the portion of the radiator between the bent portion and the second end of the first antenna radiator 11 is arranged along the extending direction of the second side of the metal frame 10.

[0036] For example, the metal frame 10 can be the metal frame of the electronic device. For instance, the first antenna radiator 11 can be formed by a portion of the metal frame between a first slit on the first side of the metal frame of the electronic device and a second slit on the second side; or the metal frame 10 can be the metal mid-frame of the electronic device. For instance, the first antenna radiator 11 can be formed by a portion of the metal mid-frame between a first slit on the first side of the metal mid-frame of the electronic device and a second slit on the second side. Of course, the specific configuration of the first antenna radiator 11 in this embodiment is not limited to this.

[0037] It should be noted that the portion of the radiator between the bent portion and the first end of the first antenna radiator 11 is arranged along the first side of the electronic device. This portion of the radiator may be parallel to the extending direction of the first side of the metal frame 10, or a certain deviation may be allowed. Similarly, the portion of the radiator between the bent portion and the second end of the first antenna radiator 11 is arranged along the second side of the metal frame 10. This portion of the radiator may be parallel to the extending direction of the second side of the electronic device, or a certain deviation may be allowed. This application embodiment does not impose specific limitations.

[0038] For example, the second antenna radiator 12 is disposed along the first side, that is, the second antenna radiator 12 is disposed along the extension direction of the first side of the metal frame 10, or the second antenna radiator 12 is disposed along the first side of the electronic device, etc. Optionally, the second antenna radiator 12 is disposed along the first side, that is, the second antenna radiator 12 is only composed of the radiator portion disposed along the first side, and does not have a radiator portion disposed along the second side. For example, the second antenna radiator 12 can be a metal portion on the metal frame 10 that is isolated from the first antenna radiator 11, or it can be a metal radiator formed on the FPC, etc., and the embodiments of this application are not limited thereto. It should be noted that the second antenna radiator 12 being disposed along the first side can mean that the second antenna radiator 12 is parallel to the extension direction of the first side of the metal frame 10, or a certain deviation is also allowed. That is, the second antenna radiator 12 can be arranged parallel to the portion of the radiator between the bent portion and the first end of the first antenna radiator 11, or a certain deviation between the two can be allowed, etc., which are not specifically limited in this application embodiment.

[0039] In this embodiment, the first antenna radiator 11 is provided with a first grounding point 111 and a first feed point 112, and the length of the radiator from the first grounding point 111 to the first end is less than the length of the radiator from the first feed point 112 to the first end. That is, the first antenna radiator 11 can be configured in IFA mode for operation in the first frequency band. Furthermore, since the first antenna radiator 11 is formed by the metal frame portion between the first slit 101 on the first side and the second slit 102 on the second side of the metal frame 10, that is, openings are formed at the first and second ends of the first antenna radiator 11, the SAR energy can be distributed directly opposite the first end (i.e., away from the first side) and directly opposite the second end (i.e., away from the second side). In other words, by reducing the SAR energy on a single side of the electronic device, the maximum SAR value can be reduced. The scheme also avoids resonance at the frequency at which the second antenna radiator 12 operates on the first antenna radiator 11 by setting the electrical length of the radiator from the first feed point 112 to the first end to be greater than the electrical length of the second antenna radiator 12. This reduces the influence of the first antenna radiator 11 on the second antenna radiator 12, improves the isolation between the first antenna radiator 11 and the second antenna radiator 12, and thus improves antenna performance.

[0040] Optionally, the first frequency band is smaller than the second frequency band. For example, the frequency range of the first frequency band is 1.71 GHz to 2.7 GHz, and the frequency range of the second frequency band is 3.3 GHz to 3.8 GHz. Of course, the first frequency band in this application embodiment can also be a frequency band other than 1.71 GHz to 2.7 GHz (i.e., the mid-to-high frequency band), and the second frequency band can also be a frequency band other than 3.3 GHz to 3.8 GHz (i.e., the n78 band), etc., and this application embodiment is not limited thereto.

[0041] Optionally, the radiator length from the first grounding point 111 to the first end is greater than the radiator length from the first grounding point 111 to the second end of the first antenna radiator 11; wherein, the second end is the end of the first antenna radiator 11 that is close to the second gap 102.

[0042] For example, the portion of the first antenna radiator 11 from the first grounding point 111 to the first end can be called the first radiation region, and the portion of the first antenna radiator 11 from the first grounding point 111 to the second end can be called the second radiation region.

[0043] In this embodiment, by setting the radiator length from the first grounding point 111 to the first end to be greater than the radiator length from the first grounding point 111 to the second end, that is, the radiator length of the first radiation area is greater than the radiator length of the second radiation area, and setting the first feed point 112 on the second radiation area, it is ensured that the first antenna radiator 11 can work in IFA antenna mode to work in the first frequency band, and the interference of the first antenna radiator 11 to the second antenna radiator 12 can be reduced.

[0044] Optionally, the electrical length of the second antenna radiator 12 satisfies: The electrical length of the radiator from the first feed point 112 to the first end of the first antenna radiator 11 satisfies:

[0045] Where L1 is the electrical length of the second antenna radiator 12, d is the electrical length of the radiator from the first feed point 112 to the first end of the first antenna radiator 11, λ1 is the dielectric wavelength corresponding to the resonant frequency of the second antenna radiator 12 operating in the second frequency band, and σ1 is the error.

[0046] For example, σ1 could be an error quantity based on the actual application scenario or processing technology, or it could consider the length of the second antenna radiator 12 when... When the frequency is near the resonant frequency of the second frequency band, σ1 can also refer to the frequency at which the second frequency band is resonant. The error in the vicinity that can satisfy the resonant frequency of the second frequency band, etc. Of course, the value of σ1 can be positive or zero, and the embodiments of this application are not limited thereto.

[0047] In this embodiment, the electrical length of the second antenna radiator 12 is set to satisfy: That is, the second antenna radiator 12 operates in the second frequency band by using a 1 / 4 wavelength mode. To reduce interference from the first antenna radiator 11 to the second antenna radiator 12, the electrical length of the radiator from the first feed point 112 to the first end of the first antenna radiator 11 can be set to be greater than the electrical length of the second antenna radiator 12. To ensure better isolation between the first antenna radiator 11 and the second antenna radiator 12, the following settings can be preferred: Of course, the embodiments of this application do not limit the value of d, and it can also be... However, the embodiments in this application are not limited thereto.

[0048] For example, referring to the antenna design shown in Figure 1, since the distance from the feed of antenna 1 to the slot 5 is close to the length of antenna 2, resonance at the frequency where antenna 2 operates can easily occur on antenna 1. As shown in Figure 2, in addition to its own B3 band (1.71GHz~1.88GHz), resonance also occurs in the n78 band (3.3GHz~3.8GHz) of antenna 2 in the reflection coefficient curve of antenna 1. The isolation between antenna 1 and antenna 2 is very poor, as shown in Figure 4, with the isolation between them being below -6.5dB. The solution adopted in this application embodiment, by setting the radiator length from the first feed point 112 to the first end of the first antenna radiator 11 to be very long, for example, greater than half the wavelength of the medium corresponding to the resonant frequency of the second antenna radiator 12 operating in the second frequency band, and the radiator length from the first feed point 112 to the first end of the first antenna radiator 11 to be very short, for example, less than one-quarter of the wavelength of the medium corresponding to the resonant frequency of the second antenna radiator 12 operating in the second frequency band, makes it impossible to generate resonance at the frequency at which the second antenna radiator 12 operates on the first antenna radiator 11. For example, taking the first frequency band as the mid-high frequency band (1.71GHz~2.7GHz) and the second frequency band as the n78 band (3.3GHz~3.8GHz) as an example, as shown in Figure 7, in the reflection coefficient curve of the first antenna radiator 11, resonance only occurs in the B3 band (1.71GHz~1.88GHz) where the first antenna radiator 11 itself operates. Therefore, compared with the antenna design scheme shown in FIG1, the antenna design scheme in this embodiment has improved the isolation between the first antenna radiator 11 and the second antenna radiator 12, as shown in FIG9, with the isolation between the two being below -27.9dB.

[0049] Optionally, the second antenna radiator 12 is positioned directly opposite the first portion of the first antenna radiator 11, or as described in other words, the orthographic projection area of ​​the second antenna radiator 12 onto the first antenna radiator 11 is located within the first portion of the first antenna radiator 11; wherein, the first portion is the radiator portion of the first antenna radiator 11 extending from the first grounding point 111 to the first end. Here, the orthographic projection area refers to the projection area formed on the first antenna radiator 11 by light rays perpendicular to the second antenna radiator 12 illuminating the second antenna radiator 12.

[0050] In this embodiment, the second antenna radiator 12 is positioned directly opposite the first part of the first antenna radiator 11 (i.e., the first radiation area), or the orthogonal projection area of ​​the second antenna radiator 12 on the first antenna radiator 11 is located in the first part of the first antenna radiator 11 (i.e., the first radiation area). That is, the second antenna radiator 12 is positioned directly opposite the first radiation area and there is no directly opposite area between the second antenna radiator 12 and the second radiation area. As a result, the current coupled from the second antenna radiator 12 to the first antenna radiator 11 only appears in the first radiation area. Since a first grounding point 111 is provided between the first radiation area and the first feed point 112, the coupling current on the first antenna radiator 11 can return to ground from the first grounding point 111. Therefore, the coupling current at the first feed point 112 is very small, that is, the mutual influence between the first antenna radiator 11 and the second antenna radiator 12 is small, and the isolation is improved.

[0051] For example, the second antenna radiator 12 can obtain energy through coupling with the first antenna radiator 11. For instance, there might be a coupling gap between the second antenna radiator 12 and the first antenna radiator 11, meaning the second antenna radiator 12 can form a strong coupling with the first antenna radiator 11, thus radiating energy with the help of the first antenna radiator 11. On the other hand, the second antenna radiator 12 can also be equipped with a second feed point, meaning it can also obtain energy through its own feed. Specifically, the relative position of the second feed point of the second antenna radiator 12 to the first grounding point 111 is not specifically limited in this embodiment.

[0052] In the antenna design shown in Figure 1, an additional LC filter circuit is required at the feed point of antenna 1. The resonant frequency of this LC filter circuit is within the operating frequency range of antenna 2. This LC filter circuit is used to resolve the mutual interference between antenna 1 and antenna 2. When using this filter circuit, antenna 1 will generate additional matching loss, leading to a degrade in antenna 1's performance. However, in the solution of this application embodiment, by setting the length of the radiator from the first feed point 112 to the first end to be greater than the length of the second antenna radiator 12, the isolation between the first antenna radiator 11 and the second antenna radiator 12 is improved, thus eliminating the need to add such an LC circuit for filtering at the first feed point 112 of the first antenna radiator.

[0053] Figure 7 shows a schematic diagram of the reflection coefficient curve of the first antenna radiator 11 in this embodiment of the application; Figure 8 shows a schematic diagram of the reflection coefficient curve of the second antenna radiator 12 in this embodiment of the application; and Figure 9 shows a schematic diagram of the isolation between the first antenna radiator 11 and the second antenna radiator 12 in this embodiment of the application. It can be seen that in this embodiment of the application, resonance only occurs in the B3 frequency band (1.71GHz~1.88GHz) where the first antenna radiator 11 itself operates, and resonance does not occur in the n78 frequency band (3.3GHz~3.8GHz). The isolation between the first antenna radiator 11 and the second antenna radiator 12 is high, below -27.9dB.

[0054] In the antenna design shown in Figure 1, when antenna 2 is working, a coupling current will be generated on antenna 1. Since the feed of antenna 1 is directly opposite to antenna 2, the coupling current will flow directly into the feed of antenna 1, as shown by the arrow in Figure 10. Referring to the current distribution in the partial schematic diagram of the top antenna design of the electronic device given in Figure 10, the current coupled from antenna 2 to antenna 1 flows through the feed and switch 4 to the return point 3. Therefore, the isolation between antenna 1 and antenna 2 will be very poor. In the embodiment of this application, by setting the orthogonal projection area of ​​the second antenna radiator 12 on the first antenna radiator 11 to be located in the first radiation area, and setting the first feed point 113 in the second radiation area, the current coupled from the second antenna radiator 12 to the first antenna radiator 11 only appears in the first radiation area and returns to ground from the first grounding point 111. The coupling current at the first feed point 112 is very small, as shown by the arrow in Figure 11, i.e., the current distribution in the partial schematic diagram of the top antenna design of the electronic device given in Figure 11. Most of the current coupled from the second antenna radiator 12 to the first antenna radiator 11 returns to ground from the first grounding point 111 before reaching the first feed point 112. Thus, the mutual influence between the first antenna radiator 11 and the second antenna radiator 12 is small, and the isolation is improved.

[0055] Optionally, the electronic device further includes: a matching circuit 13; the matching circuit 13 is connected to the target location of the first antenna radiator 11, and the matching circuit 13 is used to switch the first antenna radiator 11 to operate in different sub-frequency bands in the first frequency band; wherein, the radiator length from the target location to the first end is less than the radiator length from the first grounding point 111 to the first end.

[0056] For example, the matching circuit 13 may include a switch, and may also include a capacitor and / or an inductor. The capacitor and / or inductor connected to the first antenna radiator 11 in the matching circuit 13 can be switched by the switch, thereby switching the first antenna radiator 11 to operate in different sub-bands in the first frequency band.

[0057] Optionally, the first end of the second antenna radiator 12 is positioned directly opposite the target position of the first antenna radiator 11; and / or, the second end of the second antenna radiator 12 is positioned directly opposite the first grounding point 111.

[0058] Wherein, the first end of the second antenna radiator 12 is the end close to the first gap 101, and the second end of the second antenna radiator 12 is the end away from the first gap 101.

[0059] For example, when the second antenna radiator 12 is positioned directly opposite the first portion of the first antenna radiator 11 (i.e., the first radiation area), or when the orthogonal projection area of ​​the second antenna radiator 12 onto the first antenna radiator 11 is located within the first portion of the first antenna radiator 11 (i.e., the first radiation area), the relative positional relationship between the second antenna radiator 12 and the first antenna radiator 11 may further include: the first end of the second antenna radiator 12 being directly opposite the target position of the first antenna radiator 11; or, the second end of the second antenna radiator 12 being directly opposite the first grounding point 111; or, the first end of the second antenna radiator 12 being directly opposite the target position of the first antenna radiator 11, and the second end of the second antenna radiator 12 being directly opposite the first grounding point 111.

[0060] In this embodiment, when the second antenna radiator 12 is positioned directly opposite the first part of the first antenna radiator 11 (i.e., the first radiation area), or when the orthogonal projection area of ​​the second antenna radiator 12 on the first antenna radiator 11 is located in the first part of the first antenna radiator 11 (i.e., the first radiation area), by further positioning the first end of the second antenna radiator 12 directly opposite the target position of the first antenna radiator 11, and / or positioning the second end of the second antenna radiator 12 directly opposite the first grounding point 111, the antenna performance of the second antenna radiator 12 operating in the second frequency band can be improved while ensuring that the mutual influence between the first antenna radiator 11 and the second antenna radiator 12 is small and the isolation is improved.

[0061] The following is a detailed description of the SAR reduction effect of the embodiments of this application: By opening a first slot 101 and a second slot 102 on the metal frame 10, and the first slot 101 and the second slot 102 are respectively located on different sides of the metal frame 10, for example, the first slot 101 can be set on the first side of the metal frame 10 (e.g., the top side), and the second slot 102 can be set on the second side of the metal frame 10 (e.g., the right side), that is, the metal part on the metal frame 10 located between the first slot 101 and the second slot 102 forms the first antenna radiator 11. The first grounding point 111 (or ground return position) of the first antenna radiator 11 is set between the first slot 101 and the second slot 102, that is, the first slot 101 to the first grounding point 111 (or ground return position) constitutes the first radiation area, and the second slot 102 to the first grounding point 111 (or ground return position) constitutes the second radiation area. In the antenna design shown in Figure 1, antenna 1 has only one slot 5. Therefore, the current from slot 5 to return point 3 exists only on one side, as shown by arrow N in Figure 12. At this time, the main SAR energy of the antenna exists only on the opposite side of the slot, as shown by arrow M in Figure 12. That is, referring to the current distribution and SAR energy distribution in the partial schematic diagram of the antenna design on the top of the electronic device given in Figure 12, the current is along the direction from slot 5 to return point 3, and the SAR energy is concentrated on the top of the electronic device.

[0062] In this embodiment, by setting the first antenna radiator 11 to have two slits, there will be current distributions from both sides of the slits to the return point, as shown by arrows P1 and P2 in FIG13. Through the first slit 101 and the second slit 102, and the first grounding point 111 between the first slit 101 and the second slit 102, the current on the first antenna radiator 11 exists simultaneously on the top and right sides. That is, referring to the current distribution in the partial schematic diagram of the top antenna design of the electronic device given in FIG13, the current is distributed along the direction from the first slit 101 to the first grounding point 111 and the direction from the second slit 102 to the first grounding point 111. Due to the current distribution caused by this structural design, the main energy of the first antenna radiator 11 is dispersed to the opposite side of the first slit 101 (as shown by arrow Q1 in Figure 13) and the opposite side of the second slit 102 (as shown by arrow Q2 in Figure 13). This is the SAR energy distribution shown in the partial schematic diagram of the top antenna design of the electronic device in Figure 13. The SAR energy is dispersed to the top and sides of the electronic device. By averaging the energy to the two sides, the energy on each side is lower, thus reducing the maximum value of SAR and achieving the effect of reducing the SAR value.

[0063] Optionally, the electronic device further includes a metal ground 14; the first ground point 111 is connected to the metal ground 14. For example, the metal ground may be the motherboard of the electronic device and a large piece of metal connected to it, forming an induced current with the antenna radiator, serving as the antenna's reference ground. By connecting the first ground point 111 to the metal ground 14, a loop current is formed on the first antenna radiator 11, i.e., a current is generated to radiate energy.

[0064] Optionally, the first grounding point 111 is connected to the metal ground 14 via a capacitor or an inductor. For example, connecting the first grounding point 111 to the metal ground 14 via a capacitor or an inductor can help improve the isolation of the first antenna radiator 11. For instance, if the first grounding point 111 is grounded via a capacitor, the first radiating area constitutes a suspended metal branch, which can also be used for SAR detection, etc., but this application embodiment is not limited thereto.

[0065] Taking the first frequency band as the mid-to-high frequency band (1.7GHz to -2.7GHz) and the second frequency band as the n78 band (3.3GHz to 3.8GHz) as an example, the technical effects of the embodiments of this application are explained as follows:

[0066] In this embodiment, by setting the location of the gap in the first antenna radiator 11 for operation in the mid-to-high frequency band (1.7GHz to -2.7GHz), the location of the first feed point, the location of the matching circuit 13, the location of the first grounding point 111, and the relative positional relationship between the first antenna radiator 11 and the second antenna radiator 12 for operation in the n78 frequency band (3.3GHz to 3.8GHz), a compact antenna layout for the mid-to-high frequency antenna and the n78 antenna is achieved. Furthermore, a current distribution different from the antenna design shown in Figure 1 is achieved. This results in low SAR performance for the mid-to-high frequency antenna while maintaining high isolation between the mid-to-high frequency antenna and the n78 antenna, and also improves the performance of the n78 antenna.

[0067] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0068] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0069] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0070] The above describes the preferred embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles described in this application, and these improvements and modifications are also within the protection scope of this application.

Claims

1. An electronic device, comprising: A metal frame, wherein a first slit is formed on a first side of the metal frame, and a second slit is formed on a second side of the metal frame, and the portion of the metal frame between the first slit and the second slit forms a first antenna radiator; wherein the first antenna radiator is used to operate in a first frequency band, and the first side and the second side are arranged adjacent to each other. The second antenna radiator is located inside the metal frame and is disposed along the first side; there is a coupling gap between the second antenna radiator and the first antenna radiator; wherein the second antenna radiator is used to operate in the second frequency band; The first antenna radiator is provided with a first grounding point and a first feed point. The electrical length of the radiator from the first feed point to the first end of the first antenna radiator is greater than the electrical length of the second antenna radiator. The radiator length from the first grounding point to the first end is less than the radiator length from the first feed point to the first end. The first end is the end closest to the first gap.

2. The electronic device according to claim 1, wherein, The length of the radiator from the first grounding point to the first end is greater than the length of the radiator from the first grounding point to the second end of the first antenna radiator; wherein, the second end is the end closer to the second break.

3. The electronic device according to claim 1, wherein, The electrical length of the second antenna radiator satisfies: The electrical length of the radiator from the first feed point to the first end of the first antenna radiator satisfies: Where L1 is the electrical length of the second antenna radiator, d is the electrical length of the radiator from the first feed point to the first end of the first antenna radiator, λ1 is the dielectric wavelength corresponding to the resonant frequency of the second antenna radiator operating in the second frequency band, and σ1 is the error.

4. The electronic device according to claim 1, wherein, The second antenna radiator is positioned directly opposite the first portion of the first antenna radiator; The first part is the radiating part of the first antenna radiator from the first grounding point to the first end.

5. The electronic device according to claim 1, wherein, Also includes: Matching circuit; The matching circuit is connected to the target location of the first antenna radiator, and the matching circuit is used to switch the first antenna radiator to operate in different sub-frequency bands in the first frequency band. Wherein, the length of the radiator from the target location to the first end is less than the length of the radiator from the first grounding point to the first end.

6. The electronic device according to claim 5, wherein, The first end of the second antenna radiator is positioned directly opposite the target position of the first antenna radiator; and / or, the second end of the second antenna radiator is positioned directly opposite the first grounding point. Wherein, the first end of the second antenna radiator is the end close to the first fracture, and the second end of the second antenna radiator is the end away from the first fracture.

7. The electronic device according to claim 1, wherein, The first frequency band is less than the second frequency band.

8. The electronic device according to claim 1, wherein, The frequency range of the first frequency band is 1.71 GHz to 2.7 GHz, and the frequency range of the second frequency band is 3.3 GHz to 3.8 GHz.

9. The electronic device according to claim 1, wherein, Also includes: metal ground; The first grounding point is connected to the metal ground.

10. The electronic device according to claim 9, wherein, The first grounding point is connected to the metal ground via a capacitor or an inductor.

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