An electronic device

Abstract

An electronic device, comprising: a first radiator having a first grounding end, a first coupling end, and a first feeding point; a first signal source for feeding a first excitation signal into the first radiator, the first excitation signal being used to excite the first radiator to generate a first resonance mode in the ultra-high frequency band; a second radiator having a second grounding end, a second coupling end, and a second feeding point; a second signal source for feeding a second excitation signal into the second radiator, the second excitation signal being used to excite the second radiator to generate a second resonance mode in the medium-high frequency band; wherein, the first resonance mode generates a first strong magnetic field region covering the first feeding point, the second resonance mode generates a second strong magnetic field region covering the second feeding point, the second radiator located between the second coupling end and the second feeding point and the second strong magnetic field region jointly enclose a semi-open avoidance region, and the first strong magnetic field region is located on a side of the avoidance region away from the second strong magnetic field region.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of radio frequency communication, and particularly to an electronic device. Background Art

[0002] Under the action of an external electromagnetic field, an induced electromagnetic field will be generated in the human body. Since various organs of the human body are lossy dielectrics, the electromagnetic field in the body will generate current to absorb and dissipate electromagnetic energy.

[0003] SAR (Specific Absorption Ratio) refers to the electromagnetic radiation energy absorbed by a unit mass of a substance per unit time, and is an internationally common indicator for evaluating the impact of radio waves on the human body. It is closely monitored by communication regulatory agencies in various regions of the world. The current two mainstream standard values are 1.6 W / kg stipulated by the Federal Communications Commission (FCC) of the United States and 2.0 W / kg stipulated by the European Union.

[0004] Currently, electronic devices usually control the SAR value to be less than the standard value by restricting the radio frequency power, or reduce the radio frequency power of the electronic device when the SAR value exceeds the standard value. However, the reduction of radio frequency power easily leads to a decline in the communication performance of the electronic device, thereby affecting the call quality or network quality of the electronic device. Therefore, how to improve the communication performance of an electronic device while controlling the SAR value within a reasonable range has become an urgent problem to be solved currently. Summary of the Invention

[0005] To solve any of the above technical problems, the embodiments of the present application provide an electronic device, including:

[0006] A first radiator, the first radiator having a first grounding end, a first coupling end, and a first feeding point located between the first grounding end and the first coupling end;

[0007] A first signal source, electrically connected to the first feeding point, for feeding a first excitation signal into the first radiator, the first excitation signal being used to excite the first radiator to generate a first resonance mode in the ultra-high frequency band;

[0008] A second radiator, the second radiator having a second grounding end, a second coupling end opposite to the first coupling end, and a second feeding point located between the second grounding end and the second coupling end;

[0009] A second signal source, connected to the second feeding point, for feeding a second excitation signal into the second radiator, the second excitation signal being used to excite the second radiator to generate a second resonance mode in the medium-high frequency band;

[0010] Among them, the first resonant mode generates a first strong magnetic field region covering the first feeding point, the second resonant mode generates a second strong magnetic field region covering the second feeding point, a second radiator located between the second coupling end and the second feeding point and the second strong magnetic field region jointly enclose a semi-open avoidance region, and the first strong magnetic field region is located on a side of the avoidance region far from the second strong magnetic field region.

[0011] The above technical solution has the following advantages or beneficial effects:

[0012] By arranging the first strong magnetic field region on the side of the avoidance region far from the second strong magnetic field region, controlling the non-overlap of the first strong magnetic field region and the avoidance region, when the electronic device operates in the ultra-high frequency band, the first strong magnetic field region has as little radiation impact on the human body as possible, achieving the purpose of controlling the SAR value, avoiding the occurrence of non-compliance problems due to excessive SAR value, and realizing the improvement of the communication performance of the electronic device while controlling the SAR value within a reasonable range.

[0013] Other features and advantages of the embodiments of the present application will be described in the subsequent description, and part of them will be obvious from the description, or will be understood by implementing the embodiments of the present application. The purpose and other advantages of the embodiments of the present application can be realized and obtained through the structures specifically pointed out in the description, the claims and the drawings. Description of the Drawings

[0014] The drawings are used to provide a further understanding of the technical solutions of the embodiments of the present application, and constitute a part of the description. Together with the embodiments of the present application, they are used to explain the technical solutions of the embodiments of the present application, and do not constitute a limitation to the technical solutions of the embodiments of the present application.

[0015] FIG. 1(a) is a schematic structural diagram of an electronic device 1000 provided by an embodiment of the present application;

[0016] FIG. 1(b) is an exploded schematic structural diagram of the electronic device shown in FIG. 1(a);

[0017] FIG. 1(c) is a schematic structural diagram of the antenna assembly 100 installed in the electronic device 1000;

[0018] FIG. 1(d) is a schematic diagram of the electronic device 1000 in a landscape screen state;

[0019] Figure 2 is a schematic diagram of the antenna assembly 100 provided by an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of the circuit distribution of the first resonant mode and the second resonant mode;

[0021] Figure 4 Schematic diagram of the current distribution for the third resonance mode;

[0022] Figure 5 Schematic diagram of the current distribution for the fourth resonance mode;

[0023] Figure 6 Schematic diagram of the S-parameters of the antenna assembly 100;

[0024] Figure 7 Another schematic diagram of the antenna assembly 100 provided by the embodiment of the present application;

[0025] Figure 8 Schematic diagram of the S-parameters of the second excitation signal I2 under the action of the second matching circuit M2;

[0026] Figure 9 Comparison diagram of the system radiation efficiency of the MHB band and the N78 band in free space between the original scheme and the new scheme;

[0027] Figure 10 Another schematic diagram of the antenna assembly provided by the embodiment of the present application. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer and more understandable, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily.

[0029] Please refer to FIG. 1(a). FIG. 1(a) is a schematic diagram of the structure of an electronic device 1000 provided by an embodiment of the present application. The electronic device 1000 includes an antenna assembly 100. The antenna assembly 100 is used to transmit and receive electromagnetic wave signals to implement the communication function of the electronic device 1000. The present application does not specifically limit the position of the antenna assembly 100 within the electronic device 1000. The electronic device 1000 further includes a display screen 300 and a housing 200 that are covered and connected to each other.

[0030] The antenna assembly 100 can be disposed inside the housing 200 of the electronic device 1000, or partially integrated with the housing 200, or partially disposed outside the housing 200. In FIG. 1(a), the radiator of the antenna assembly 100 is integrated with the housing 200. Of course, the antenna assembly 100 can also be disposed on the retractable component of the electronic device 1000. In other words, at least part of the antenna assembly 100 can also extend outside the electronic device 1000 along with the retractable component of the electronic device 1000, and retract into the electronic device 1000 along with the retractable component; or, the overall length of the antenna assembly 100 extends as the retractable component of the electronic device 1000 extends.

[0031] The electronic device 1000 includes, but is not limited to, devices capable of transmitting and receiving electromagnetic wave signals such as a telephone, a television, a tablet computer, a mobile phone, a camera, a personal computer, a laptop computer, a vehicle-mounted device, a headset, a watch, a wearable device, a base station, a vehicle-mounted radar, a customer premise equipment (CPE), etc. In this application, the electronic device 1000 is taken as a mobile phone as an example, and other devices can refer to the specific description in this application.

[0032] For ease of description, with reference to the perspective of the electronic device 1000 in FIG. 1, the width direction of the electronic device 1000 is defined as the X-axis direction, the length direction of the electronic device 1000 is defined as the Y-axis direction, and the thickness direction of the electronic device 1000 is defined as the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other pairwise. Among them, the direction indicated by the arrow is the positive direction.

[0033] Please refer to FIG. 1(b). The housing 200 includes a frame 210 and a rear cover 220. A middle plate 410 is formed by injection molding inside the frame 210, and a plurality of mounting grooves for mounting various electronic components are formed on the middle plate 410. The middle plate 410 and the frame 210 together form the middle frame 420 of the electronic device 1000. After the display screen 300, the middle frame 420, and the rear cover 220 are covered, receiving spaces are formed on both sides of the middle frame 420, and a circuit board 500 and a reference ground (not shown in the figure) can be placed in the receiving spaces. One side (for example, the rear side) of the frame 210 is connected to the periphery of the rear cover 220, and the other side (for example, the front side) of the frame 210 is connected to the periphery of the display screen 300.

[0034] The electronic device 1000 further includes devices such as a battery, a camera 600, a microphone, a receiver, a speaker, a face recognition module, a fingerprint recognition module, etc. that are disposed in the receiving space and can implement the basic functions of a mobile phone, which will not be elaborated in this embodiment.

[0035] FIG. 1(c) is a schematic structural diagram of the antenna assembly 100 mounted on the electronic device 1000. As shown in FIG. 1(c), the reference ground GND includes a first side 61 and a second side 62 that are oppositely arranged, and a third side 63 and a fourth side 64 that are connected between the first side 61 and the second side 62. The connection between two adjacent sides is a corner 65. Among them, the first side 61 is the top side of the reference ground GND (with reference to the state where the user holds the electronic device 1000 vertically and uses it), and the second side 62 is the bottom side of the reference ground GND.

[0036] As shown in FIG. 1(c), the frame 210 includes a plurality of side frames connected end to end. Among the plurality of side frames of the frame 210, two adjacent side frames intersect. For example, two adjacent side frames are connected by an arc chamfer transition. The plurality of side frames include a top frame 2101 and a bottom frame 2102 disposed opposite to each other, and a first side frame 2103 and a second side frame 2104 connected between the top frame 2101 and the bottom frame 2102. Among them, the top frame 2101 is the side away from the ground when the operator holds the electronic device 1000 facing the front of the electronic device 1000, and the bottom frame 2102 is the side facing the ground. The connection between two adjacent side frames is a corner portion 2106. Among them, the top frame 2101 and the bottom frame 2102 are parallel and equal. The first side frame 2103 and the second side frame 2104 are parallel and equal. The length of the first side frame 2103 is greater than the length of the top frame 2101.

[0037] FIG. 1(d) is a schematic diagram of the electronic device 1000 in a landscape screen state. If the antenna assembly 110 is disposed on the first side frame 2103 or the second side frame 2104, when the user holds the electronic device 1000 in landscape (such as playing games or watching videos in landscape), the holding positions of the user's hands are on the top frame 2101 and the bottom frame 2102 of the electronic device 1000. Specifically, see the dotted area in FIG. 1(d). This dotted area is only for illustration and does not limit the specific shape of the holding area. The user's finger (such as the right hand or the middle finger of the right hand) will touch the area below the first side frame 2103 or the second side frame 2104. Specifically, see the finger-covered area in FIG. 1(d) as the human contact area.

[0038] Since the finger is relatively close to the middle position of the first side frame 2103 or the second side frame 2104 in the human contact area of the electronic device 1000, when the antenna assembly 100 is installed on the electronic device 1000 in the manner shown in FIG. 1(c), since the human contact area overlaps with the position of the signal source of the antenna assembly 100, the excitation signal generated by the signal source will cause strong electromagnetic radiation to the human body. Among them, the stronger the energy of the excitation signal generated by the signal source, the larger the SAR value. Therefore, installing the antenna assembly 100 on the electronic device 1000 in the above manner is likely to cause the SAR of the electronic device 100 to be non-compliant.

[0039] In view of the above technical problems, the embodiments of the present application provide the following solutions, including:

[0040] Figure 2 It is a schematic diagram of the antenna assembly 100 provided by the embodiment of the present application. As Figure 2 shown, the antenna assembly 100 includes a first radiator 11, a second radiator 12, a first signal source F1, and a second signal source F2; wherein:

[0041] The first radiator 11 is located on the side frame 2103 or the second side frame 2104 of the electronic device.

[0042] Two ends of the first radiator 11 are respectively a first grounding end 111 and a first coupling end 112. In this embodiment, the first radiator 11 is bent, and the first grounding end 111 and the first coupling end 112 may not be opposite to each other in a straight line direction. In other embodiments, the first grounding end 111 and the first coupling end 112 are opposite ends of the first radiator 11 in a straight bar shape.

[0043] Please refer to Figure 2 , the first coupling end 112 extends in a direction away from the first grounding end 111, so that the distance between the first coupling end 112 and the corner portion 2106 is shortened; that is, the distance between the first coupling end 112 and the corner portion 21061 is less than the distance between the first grounding end 111 and the corner portion 2106.

[0044] Please refer to Figure 2 , the first grounding end 111 is electrically connected to the reference ground GND, and the electrical connection method includes but is not limited to direct welding, or indirect electrical connection through a coaxial cable, a microstrip line, a conductive elastic sheet, a conductive adhesive, etc. This application does not limit the specific position of the feeding point A on the first radiator 11.

[0045] The second radiator 12 and the first radiator 11 are located on the same side frame. Two ends of the second radiator 12 are respectively a second grounding end 121 and a second coupling end 122. In this embodiment, the second radiator 12 is bent, and the second grounding end 121 and the second coupling end 122 may not be opposite to each other in a straight line direction. In other embodiments, the second grounding end 121 and the second coupling end 122 are opposite ends of the first radiator 11 in a straight bar shape.

[0046] Among them, there is a coupling gap 140 between the second coupling end 122 and the first coupling end 112. The first radiator 11 and the second radiator 12 can generate capacitive coupling through the coupling gap 140. Optionally, the first radiator 11 and the second radiator 12 may be arranged in a straight line or substantially in a straight line (i.e., having a small tolerance during the design process).

[0047] Please refer to Figure 2 , the second coupling end 122 extends in a direction away from the first grounding end 111, so that the distance between the second coupling end 122 and the corner portion 2106 is increased; that is, the distance between the second coupling end 122 and the corner portion 2106 is greater than the distance between the second grounding end 121 and the corner portion 2106. It can be seen from Figure 2 that the second grounding end 121 is closer to the corner portion 2106 than the first grounding end 111.

[0048] Please refer to Figure 2, the first coupling end 112 and the second coupling end 122 are opposite and spaced apart. The coupling gap 140 is a break gap between the first radiator 11 and the second radiator 12. For example, the width of the first coupling gap 140 can be 0.5 to 2 mm, but is not limited to this size. The first radiator 11 and the second radiator 12 can be regarded as two parts formed by the radiator being separated by the coupling gap 140.

[0049] The first radiator 11 and the second radiator 12 are capacitively coupled through the first coupling gap 140. Among them, "capacitive coupling" means that an electric field is generated between the first radiator 11 and the second radiator 12, and the signal of the first radiator 11 can be transmitted to the second radiator 12 through the electric field, and the signal of the second radiator 12 can be transmitted to the first radiator 11 through the electric field, so that the first radiator 11 and the second radiator 12 can achieve electrical signal conduction even when they are not in direct contact or direct connection.

[0050] It can be understood that the present application does not specifically limit the shapes and structures of the first radiator 11 and the second radiator 12. The shapes of the first radiator 11 and the second radiator 12 include but are not limited to strip, sheet, rod, coating, film, etc. When the first radiator 11 and the second radiator 12 are in strip shape, the present application does not limit the extension trajectories of the first radiator 11 and the second radiator 12. Therefore, the first radiator 11 and the second radiator 12 can both extend in straight lines, curves, multi-segment bends and other trajectories. The above-mentioned radiators can be lines with uniform width on the extension trajectory, or can be strips with unequal widths such as gradually changing width and having widened areas.

[0051] Optionally, the antenna assembly 100 itself has a reference ground. The specific forms of the reference ground include but are not limited to metal conductive plates, metal conductive layers formed inside flexible circuit boards, and rigid circuit boards. Among them, the reference ground GND can be an integrally formed reference ground in the antenna assembly 100, or can be two mutually independent but connected reference grounds in the antenna assembly 100. When the antenna assembly 100 is disposed in the electronic device 1000, the reference ground of the antenna assembly 100 is electrically connected to the reference ground of the electronic device 1000. Further optionally, the antenna assembly 100 itself does not have a reference ground, and the first grounding end 111 of the antenna assembly 100 is directly electrically connected or indirectly electrically connected to the reference ground of the electronic device 1000 or the reference ground of the electronic components in the electronic device 1000 through a conductive member. In the present application, the antenna assembly 100 is disposed in the electronic device 1000, and the metal alloy on the middle plate 410 is used as the reference ground GND. That is, the reference ground GND to which the first grounding end 111 is electrically connected is a part of the middle plate 410 or is electrically connected to the middle plate 410.

[0052] The first signal source F1 is electrically connected to the first radiator and is configured to feed a first excitation signal I1 into the first radiator 11 to generate a first resonance mode. For example, the first signal source F1 is electrically connected through a first feeding point A located between the first grounding end 111 and the first coupling end 112, thereby achieving the electrical connection with the first radiator 11.

[0053] The first signal source F1 is configured to feed a first excitation signal I1 into the first radiator 11. The first excitation signal I1 is transmitted on the first radiator 11 to excite the first radiator 11 to generate a first resonance mode in the ultra-high frequency band.

[0054] The effective electrical length of the first radiator 11 is 1 / 4 times the wavelength of the current frequency provided by the first signal source F1 in the medium, where the wavelength refers to the wavelength of the electromagnetic wave in the medium of the environment. Since the 1 / 4 wavelength mode is a resonance mode with relatively high efficiency, therefore, adopting an effective electrical length of 1 / 4 times the wavelength can facilitate the generation of the resonance mode, enabling the first excitation signal I1 to resonate in the 1 / 4 wavelength mode on the first radiator 11.

[0055] The second signal source F2 is electrically connected to the second radiator 12 and is configured to feed a second excitation signal I2 into the second radiator 11 to generate a second resonance mode in the middle high band (MHB). For example, the second signal source F2 is electrically connected through a second feeding point B located between the second grounding end 121 and the first coupling end 122, thereby achieving the electrical connection with the second radiator 12.

[0056] Wherein, the effective electrical length of the second radiator 12 is 1 / 4 times the wavelength of the current frequency provided by the second signal source F in the medium. Adopting an effective electrical length of 1 / 4 times the wavelength can facilitate the generation of the resonance mode, enabling the second excitation signal I2 to resonate in the 1 / 4 wavelength mode on the second radiator 12.

[0057] In an exemplary embodiment, the ultra-high band (UHB) at least includes N77, N78, and N79, which are mainly applied to NR (New Radio) 5G or LTE (Long Term Evolution) system communications and are relatively important frequency bands for electronic devices in mobile communications. From the frequency bands supported by the first resonance mode and the second resonance mode, it can be seen that the antenna assembly 100 can cover the MHB band and UHB band of LTE, the MHB and UHB bands of the NR 5G network, and WIFI 2.4G.

[0058] When the electronic device 1000 operates in the Dual Sim Dual Standby (DSDS) mode, the first signal source F1 and the second signal source F2 of the antenna assembly 100 can be used to respectively output radio frequency signals in the ultra-high frequency band and radio frequency signals in the medium-high frequency band, so as to achieve the output of different frequency bands. By using different signal sources to generate radio frequency signals in different frequency bands respectively, the radiation performance of the radio frequency signals can be improved.

[0059] Please refer to Figure 2 , the first resonant mode generates a first strong magnetic field region C1 covering the first feeding point A, and the second resonant mode generates a second strong magnetic field region C2 covering the second feeding point B. The region determined by the dotted line in the figure is only for illustration and does not limit the specific shape of the magnetic field.

[0060] Among them, the second radiator 12 located between the second coupling end 122 and the second feeding point B and the second strong magnetic field region C2 together enclose a semi-open avoidance region R. This avoidance region R is the region that is contacted by the user's finger when the electronic device is in a held state, and can also be understood as the human body contact region. That is, this avoidance region R is used to avoid the influence of the user's finger grip on the antenna radiation performance. The avoidance region R determined by the dotted line in the figure is only for illustration and does not limit the specific shape of the avoidance region R.

[0061] The first strong magnetic field region C1 is located on the side of the avoidance region R away from the second strong magnetic field region C2. By controlling the first strong magnetic field region C1 not to overlap with the avoidance region R, when the electronic device 1000 operates in the ultra-high frequency band, the first strong magnetic field region C1 has as little radiation impact on the human body as possible, achieving the purpose of controlling the SAR value, avoiding the occurrence of non-compliance problems due to excessive SAR values, and realizing improving the communication performance of the electronic device while controlling the SAR value within a reasonable range.

[0062] Please refer to Figure 3 , the current distribution of the first resonant mode is from the first feeding point A to the first coupling end 112. The current distribution of the second resonant mode is from the second feeding point B to the second coupling end 122.

[0063] Optionally, the second excitation signal I2 is also used to excite the second radiator 12 to generate a third resonant mode, and the third resonant mode is a quarter-wavelength resonant mode of the first frequency band.

[0064] The same as the second resonant mode, the third resonant mode is also generated by the second excitation signal I2 exciting the second radiator 12. The difference is that the current distribution of the third resonant mode is different from the current distribution of the second resonant mode. Therefore, the frequency bands of the radio frequency signals generated by the two are also different.

[0065] Figure 4 Schematic diagram of the current distribution of the third resonance mode. As Figure 4 shown, the current distribution of the third resonance mode is from the second grounding end 121 to the second coupling end 122.

[0066] Optionally, at least part of the second excitation signal I2 is coupled to the first radiator 12 through the coupling slot 101, and the first radiator 12 is excited to generate a fourth resonance mode, and the fourth resonance mode is a quarter-wavelength resonance mode of the second frequency band.

[0067] Figure 5 Schematic diagram of the current distribution of the fourth resonance mode. As Figure 5 shown, the current distribution of the fourth resonance mode is from the first grounding end 111 to the first coupling end 112.

[0068] Compared with the first resonance mode, the fourth resonance mode is also generated by exciting the first radiator, but the excitation signals used by the two are different, and the current distributions are also different. Therefore, the frequency bands generated by the two resonance modes are also different.

[0069] Figure 6 Schematic diagram of the S parameters of the antenna assembly 100. As Figure 6 shown, the marked points 1 to 4 are the resonance frequencies of the third resonance mode, the second resonance mode, the fourth resonance mode, and the first resonance mode in sequence. Among them, the resonance frequency of the third resonance mode is 1.815 GHz, and the value of the S parameter is -23.467 db; the resonance frequency of the second resonance mode is 2.5339 GHz, and the value of the S parameter is -10.406 db; the resonance frequency of the fourth resonance mode is 2.7505 GHz, and the value of the S parameter is -16.293 db; the resonance frequency of the first resonance mode is 3.5006 GHz, and the value of the S parameter is -30.732 db.

[0070] From Figure 6 the S parameter curve shown, each frequency band supported by the second to fourth resonance modes is different. Among them, the resonance frequencies of the third resonance mode, the second resonance mode, and the fourth resonance mode increase in sequence.

[0071] In this embodiment, the first frequency band includes at least one of the GPS frequency band, the LTE-4G MHB frequency band, and the NR-5G MHB frequency band. For example, it includes at least one of the GPS-L5 frequency band, the B3 frequency band, the B1 frequency band, the N3 frequency band, and the N1 frequency band. The frequency bands supported by the second resonance mode include at least one of the Wi-Fi 2.4G frequency band, the LTE-4G MHB frequency band, the NR-5G MHB frequency band, etc. For example, it includes the Wi-Fi 2.4G frequency band, the B7 frequency band, the B41 frequency band, the B38 frequency band, the N7 frequency band, the N41 frequency band, etc. The second frequency band can be a higher frequency band such as WIFI 5G or WIFI7.

[0072] Figure 7 Another schematic diagram of the antenna assembly 100 provided by the embodiment of the present application. As Figure 7 shown, the electronic device further includes a first matching circuit M1 and a second matching circuit M2; among them, the matching circuit can also be called a matching network, a tuning circuit, a tuning network, etc.

[0073] The first matching circuit M1 can be coupled between the first signal source F1 and the first radiator 11. For example, the first matching circuit M1 is connected between the first signal source F1 and the first feeding point A. The first matching circuit M1 can perform impedance matching on the first excitation signal I1 provided by the first signal source F1 to generate a first resonance mode.

[0074] The second matching circuit M2 can be coupled between the second signal source F2 and the second radiator 12. For example, the second matching circuit M2 is connected between the second signal source F2 and the second feeding point B. The second matching circuit M2 can perform impedance matching on the second excitation signal I2 provided by the second signal source F2 to generate the second to fourth resonance modes.

[0075] Among them, at least one of the first matching circuit M1 and the second matching circuit M2 may include at least one of a switching device, a capacitor device, an inductor device, a resistor device, etc.

[0076] When the antenna assembly 100 operates in the fourth frequency band, since the second excitation signal I2 excites the first radiator 11, the first matching circuit M1 presents a high impedance to the second excitation signal I2, avoiding the second excitation signal I2 flowing into the first signal source F1 through the first matching circuit M1, thereby affecting the performance of the first signal source F1.

[0077] Among them, the second matching circuit M2 includes a first matching branch, a second branch, and a switching device;

[0078] The first matching branch is used to perform impedance matching on a sub-frequency band of the first frequency band;

[0079] The second matching branch is used to perform impedance matching on another sub-frequency band of the first frequency band;

[0080] The switching device is used to control one of the first matching branch and the second matching branch to be in a conducting state.

[0081] Wherein, the switching device has two first ends and a second end, one first end of the switching device is connected to one end of the first matching branch, and the other end of the switching device is connected to the other end of the second matching branch;

[0082] One second end of the switching device is connected to the second signal source F2, and the other ends of the first branch and the second branch are both connected to the second feeding point B; or, one second end of the switching device is connected to the second feeding point B, and the other ends of the first branch and the second branch are both connected to the second signal source F2.

[0083] Wherein, the switching device can be a single-pole double-throw (SPDT).

[0084] In an exemplary embodiment, the first frequency band can be an intermediate frequency, one sub-band is B3, and the other sub-band is B1.

[0085] Figure 8 It is a schematic diagram of the S-parameters of the second excitation signal I2 under the action of the second matching circuit M2. As Figure 8 shown, both S1,1-B1 and S1,2-B3 are resonance modes generated by the second excitation signal. The difference is that the third resonance mode in the curve of S1,1-B1 supports the B1 frequency band, and the third resonance mode in the curve of S1,1-B3 supports the B3 frequency band.

[0086] In the embodiment, the B3 frequency band or the B1 frequency band is selected as the test frequency band for the intermediate frequency, the WIFI 2.4G and N41 frequency bands are selected as the test frequency bands for the high frequency, and the N78 is selected as the test frequency band for the UHB frequency band. The SAR reduction values corresponding to each frequency band of the electronic device shown in Fig. 1(c) (hereinafter referred to as the "original scheme") and Figure 3 the electronic device shown (hereinafter referred to as the "new scheme") are tested. The test results are shown in Table 1:

[0087]

[0088]

[0089] Table 1

[0090] Wherein, the unit of the SAR reduction value in Table 1 is db.

[0091] As can be seen from the results shown in Table 1, the SAR decrease values in the MHB frequency band are basically the same. However, the first signal source F1 for generating the N78 frequency band is far from the human contact area, and the SAR decrease value in the N78 frequency band is significantly improved.

[0092] In the embodiment, the B3 frequency band or the B1 frequency band is selected as the test frequency band for the intermediate frequency, the WIFI 2.4G and the N41 frequency band are selected as the test frequency bands for the high frequency, and the N78 is selected as the test frequency band for the UHB frequency band. The system efficiency corresponding to each frequency band of the original scheme and the new scheme is tested, and the test results are shown in Table 2:

[0093] Frequency band System efficiency of the original scheme System efficiency of the new scheme B3 4.9 3.6 WIFI 2.4G 2.6 4.0 N41 3.6 4.0 N78 4.6 4.6

[0094] Table 2

[0095] Among them, the unit of the system efficiency in Table 2 is db.

[0096] Figure 9 It is a comparison chart of the system radiation efficiency in free space for the MHB frequency band and the N78 frequency band in the original scheme and the new scheme. As Figure 9 shown, S1-MHB is the curve of the system efficiency of the original scheme in the MHB frequency band; S1-N78 is the curve of the system efficiency of the original scheme in the N78 frequency band; S2-MHB is the curve of the system efficiency of the new scheme in the MHB frequency band; S2-N78 is the curve of the system efficiency of the new scheme in the N78 frequency band.

[0097] From Table 2 and Figure 9 the results shown, the system efficiency of the N78 frequency band is the same. However, the first signal source F1 for generating the N78 frequency band and the second signal source F2 for generating the MHB frequency band are arranged at intervals. Therefore, the system efficiency of the MHB frequency band is significantly improved.

[0098] Figure 10 It is another schematic diagram of the antenna assembly provided by the embodiment of the present application. As Figure 10 shown, the antenna assembly 100 further includes a first shunt branch LDS1 and a second shunt branch LDS2; wherein:

[0099] The first shunt branch LDS1 is electrically connected to the first matching circuit M1;

[0100] Please refer to Figure 10 , after the first matching circuit M1 is set, the deployment position of the first matching circuit M1 is relatively close to the human contact area. When the first matching circuit M1 performs impedance matching, the excitation signal is likely to cause electromagnetic radiation to the human body. Therefore, by setting the first shunt branch LDS1 to be connected to the first matching circuit M1, the excitation signal on the first matching circuit M1 can be transmitted to the first shunt branch LDS1, realizing the shunting of the current on the first matching circuit M1. Specifically, refer toFigure 10 The arrow flow direction in the figure reduces the magnitude of the current on the first matching circuit M1, avoiding an increase in the SAR value caused by impedance matching of the first matching circuit M1.

[0101] A second shunt branch LDS2 is electrically connected to the second matching circuit M2.

[0102] Please refer to Figure 10 , after the second matching circuit is set, the deployment position of the second matching circuit is relatively close to the human contact area. When the second matching circuit M1 performs impedance matching, the excitation signal is likely to cause electromagnetic radiation to the human body. Therefore, by setting the second shunt branch LDS2 to be connected to the second matching circuit M1, the excitation signal on the second matching circuit M2 can be transmitted to the second shunt branch LDS2, realizing current shunting on the second matching circuit M2. Specifically, refer to the arrow flow direction in Figure 10 to reduce the magnitude of the current on the second matching circuit M2, avoiding an increase in the SAR value caused by impedance matching of the second matching circuit M2.

[0103] At least one of the first shunt branch LDS1 and the second shunt branch LDS2 is a bracket antenna; among them, the bracket antenna can be an antenna formed by Laser Direct Structuring (LDS) technology. The LDS antenna is formed by directly plating a metal antenna on the bracket using laser technology; or it is a Flexible Printed Circuit (FPC) antenna, where the FPC antenna is an antenna made based on the antenna circuit on the circuit board and the metal outside the circuit board.

[0104] By adding a bracket antenna to the antenna assembly 100, the antenna assembly 100 can cover more frequency bands using the bracket antenna. In addition, since the bracket antenna 14 is disposed in the receiving space of the electronic device 1000, rather than on any side frame of the electronic device 1000, when the user holds the electronic device 1000 in a horizontal screen, it does not affect the radiation efficiency of the bracket antenna.

[0105] Based on the structure of the above antenna assembly 100, an embodiment of the present application further provides an electronic device 1000. The electronic device can be a smart phone, a tablet computer, etc., and can also be a game device, an Augmented Reality (AR) device, an automotive device, a data storage device, an audio playback device, a video playback device, a notebook computer, a desktop computing device, etc.

[0106] The middle frame 240 of the electronic device can be in the structure of a thin plate or a thin sheet, or can be a hollow frame structure. The middle frame 240 is used to provide a supporting effect for the electronic components or functional components in the electronic device 1000, so as to install the electronic components and functional components of the electronic device 1000 together. For example, structures such as grooves, protrusions, through holes, etc. can be provided on the middle frame 240 to facilitate the installation of the electronic components or functional components of the electronic device 1000. It can be understood that the material of the middle frame 240 can include metals, plastics, etc.

[0107] It can be understood that when the middle frame 240 includes a metal material, the first radiator 11 and the second radiator 120 can be multiple metal branches on the middle frame 240. For example, a coupling gap 101 can be provided on the middle frame 240 to form the first radiator 11 and the second radiator 12. At this time, the middle frame 240 can be reused as a radiator, which can save the space occupied by the radiator.

[0108] It can be understood that one or more of the first signal source F1, the second signal source F2, the first matching circuit M1, the second matching circuit M2, the first support antenna LDS1, and the second support antenna LDS2 of the antenna assembly 100 can be arranged on the circuit board 400.

[0109] Those of ordinary skill in the art will understand that all or some of the steps in the methods disclosed above, and the functional modules / units in systems and devices, can be implemented as software, firmware, hardware, and appropriate combinations thereof. In the hardware implementation, the division of functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be executed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium (or non-transitory medium) and a communication medium (or transitory medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable instructions, data structures, program modules, or other data. Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those of ordinary skill in the art that a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

Claims

1. An electronic device, characterized in that, comprising: a first radiator having a first grounding end, a first coupling end, and a first feeding point located between the first grounding end and the first coupling end; a first signal source electrically connected to the first feeding point for feeding a first excitation signal to the first radiator, the first excitation signal being used to excite the first radiator to generate a first resonance mode in the ultra-high frequency band; a second radiator having a second grounding end, a second coupling end opposite to the first coupling end, and a second feeding point located between the second grounding end and the second coupling end; a second signal source connected to the second feeding point for feeding a second excitation signal to the second radiator, the second excitation signal being used to excite the second radiator to generate a second resonance mode in the medium-high frequency band; wherein, the first resonance mode generates a first strong magnetic field region covering the first feeding point, the second resonance mode generates a second strong magnetic field region covering the second feeding point, the second radiator located between the second coupling end and the second feeding point and the second strong magnetic field region together enclose a semi-open avoidance region, the first strong magnetic field region is located on a side of the avoidance region away from the second strong magnetic field region, and the avoidance region is a human contact region contacted by a user's finger when the electronic device is in a held state; wherein, when the electronic device operates in the ultra-high frequency band, the first strong magnetic field region does not overlap with the avoidance region.

2. The electronic device according to claim 1, characterized in that: the current distribution of the first resonance mode is from the first feeding point to the first coupling end; the current distribution of the second resonance mode is from the second feeding point to the second coupling end.

3. The electronic device according to claim 1, characterized in that: the second excitation signal is further used to excite the second radiator to generate a third resonance mode, and the third resonance mode is a quarter-wavelength resonance mode of a first frequency band; at least part of the second excitation signal is coupled to the first radiator through a coupling gap and excites the first radiator to generate a fourth resonance mode, and the fourth resonance mode is a quarter-wavelength resonance mode of a second frequency band.

4. The electronic device according to claim 3, characterized in that: the current distribution of the third resonance mode is from the second grounding end to the second coupling end; the current distribution of the fourth resonance mode is from the first grounding end to the first coupling end.

5. The electronic device according to claim 3, characterized in that: the resonance frequencies of the third resonance mode, the second resonance mode, and the fourth resonance mode increase in sequence.

6. The electronic device according to claim 1, characterized in that, the electronic device further comprises: a housing including a top frame and a bottom frame arranged oppositely, and two side frames connected between the top frame and the bottom frame; any one of the side frames forms a corner portion with the top frame; Wherein, the second radiator and the first radiator are disposed on the same side frame, and the distance between the first grounding end and the corner is greater than the distance between the second grounding end and the corner.

7. The electronic device according to claim 3, wherein, the electronic device further comprises: a first matching circuit electrically connected between the first signal source and the first feeding point; a second matching circuit electrically connected between the second signal source and the second feeding point.

8. The electronic device according to claim 7, wherein, the second matching circuit comprises: a first matching branch for impedance matching of a sub-band of the first frequency band; a second matching branch for impedance matching of another sub-band of the first frequency band; a switching device for controlling one of the first matching branch and the second matching branch to be in a conducting state.

9. The electronic device according to claim 8, wherein, the electronic device further comprises: a first shunt branch electrically connected to the first matching circuit for shunting the current on the first matching circuit; a second shunt branch electrically connected to the second matching circuit for shunting the current on the first matching circuit.

10. The electronic device according to claim 9, wherein, at least one of the first shunt branch and the second shunt branch comprises a stub antenna.

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