Electronic device

Abstract

The electronic equipment provided by the invention comprises a reference floor and an antenna assembly, the antenna assembly comprises radiators and a feed source, the radiators are arranged at intervals along the edge of the reference floor, the feed source is electrically connected with the radiators, and the feed source is used for exciting the radiators to support a first frequency band, when the radiator works at the first frequency band, the floor current mode formed by excitation on the reference floor is the same as the characteristic current mode of the reference floor, and when the antenna assembly is designed and arranged, the floor current formed by excitation of the radiator on the floor is the same as the characteristic current mode of the floor. The problem of efficiency reduction caused by different excitation floor current and the characteristic current mode of the floor is avoided, and the working efficiency of the antenna assembly in the first frequency band is improved.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and more particularly to an electronic device. Background Art

[0002] The improvement of antenna efficiency can directly affect the signal strength and stability of a mobile phone. Higher antenna efficiency means stronger signal coverage and less signal loss, thus providing a more stable communication experience. For users, this means maintaining good call quality and data transmission speed in various environments, enhancing the user experience. With the development of 5G and future higher-generation network technologies, users' requirements for speed and data transmission are increasing day by day. How to improve antenna efficiency to ensure that users can enjoy high-speed networks has become a technical problem to be solved. Summary of the Invention

[0003] This application provides an electronic device for improving antenna efficiency.

[0004] An electronic device provided by this application includes:

[0005] A reference ground plane;

[0006] An antenna assembly, where the antenna assembly includes:

[0007] Radiators, which are arranged at intervals along the edge of the reference ground plane;

[0008] Feeds, which are electrically connected to the radiators and are used to excite the radiators to support a first frequency band. When the radiators operate in the first frequency band, the floor current mode excited on the reference ground plane is the same as the characteristic current mode of the reference ground plane.

[0009] For the electronic device provided by this application, the electronic device includes a reference ground plane and an antenna assembly. The antenna assembly includes radiators and feeds. The radiators are arranged at intervals along the edge of the reference ground plane. The feeds are electrically connected to the radiators and are used to excite the radiators to support a first frequency band. When the radiators operate in the first frequency band, the floor current mode excited on the reference ground plane is the same as the characteristic current mode of the reference ground plane. This application provides a design and layout of the antenna assembly, making the floor current formed by the excitation of the radiators on the ground plane the same as the characteristic current mode of the ground plane, avoiding the problem of efficiency reduction caused by different floor current modes between the excited floor current and the characteristic current mode of the ground plane, and improving the operating efficiency of the antenna assembly in the first frequency band. Description of the Drawings

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the following will briefly introduce the drawings required for the embodiments.

[0011] Figure 1It is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

[0012] Figure 2 It is an exploded structural schematic diagram of an electronic device provided by an embodiment of the present application;

[0013] Figure 3 It is a partial schematic diagram of an electronic device removing the back cover provided by an embodiment of the present application;

[0014] Figure 4 It is a structural schematic diagram of a reference floor and an antenna assembly provided by an embodiment of the present application Figure 1 ;

[0015] Figures 5a to 5h It is a schematic structural diagram of a matching circuit provided by an embodiment of the present application;

[0016] Figure 6 It is a schematic diagram of the characteristic current mode of the reference floor in the first frequency band provided by an embodiment of the present application;

[0017] Figure 7 It is a schematic diagram of the characteristic current mode of a reference floor and an antenna assembly in the first frequency band provided by an embodiment of the present application;

[0018] Figure 8 It is a simulation schematic diagram of the characteristic current mode of the reference floor in the first frequency band provided by an embodiment of the present application;

[0019] Figure 9 It is a simulation schematic diagram of a reference floor and an antenna assembly in the first frequency band provided by a comparative embodiment;

[0020] Figure 10 It is a current simulation schematic diagram of a reference floor and an antenna assembly in the first frequency band provided by an embodiment of the present application;

[0021] Figure 11 It is a structural schematic diagram of a reference floor and an antenna assembly provided by an embodiment of the present application Figure 2 ;

[0022] Figure 12 It is an S-parameter curve and efficiency curve diagram of the antenna assembly provided by an embodiment of the present application;

[0023] Figure 13 It is a comparison of the efficiency curves of the antenna assembly provided by an embodiment of the present application and the antenna assembly provided by the comparative embodiment;

[0024] Figures 14a to 14d It is a SAR simulation comparison of the antenna assembly in the first frequency band on the side where the first side border is located and the side where the top border is located in the electronic devices provided by the comparative embodiment and the present application;

[0025] Figures 15a to 15d It is a comparison of the SAR simulation of the antenna assembly in the electronic devices provided by the comparative example and the present application on the side where the display screen is located and the side where the back cover is located at the first frequency band.

[0026] Explanation of the reference numerals in the drawings:

[0027] Electronic device 1000; Antenna assembly 100; Display screen 200; Middle frame 300; Back cover 400; Middle plate 310; Frame 320; Top frame 321; Bottom frame 324; First side frame 322; Second side frame 323; Reference floor 500; Radiator 10; Feeder 20; Matching circuit M1; First long side 502; First short side 501; Second long side 503; Second short side 504; Main radiation branch 11; Grounding point D1; Feeding point A; First open end E1; Weak current area 5011 of the first short side; Strong current area 5012 of the first short side; Weak current area 5013 of the second short side; Parasitic radiation branch 12; Second open end E2; Connection point F; Tuning element M2. Specific embodiments

[0028] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments provided in the present application without creative efforts fall within the protection scope of the present application.

[0029] When "embodiment" is mentioned in the present application, it means that the specific features, structures or characteristics described in combination with the embodiment may be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an exclusive, independent or alternative embodiment to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described in the present application can be combined with other embodiments.

[0030] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example: A component or device including one or more components is not limited to the one or more components listed, but optionally further includes one or more components not listed but inherent in the product shown, or one or more components that should be possessed based on the described function.

[0031] Please refer to Figure 1 , Figure 1FIG. 0 is a schematic structural diagram of an electronic device 1000 provided by an embodiment of the present application. The electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablet computers, laptop computers, computers, wearable devices, drones, robots, digital cameras, etc. In the embodiment of the present application, a mobile phone is taken as an example for illustration, and other electronic devices can refer to this embodiment.

[0032] Please refer to Figure 2 , Figure 2 FIG. 7 is a partial exploded schematic diagram of the electronic device 1000 provided by an embodiment of the present application. Taking the electronic device 1000 as a mobile phone as an example, the working environment of the antenna assembly 100 is illustrated. The electronic device 1000 includes a display screen 200, a middle frame 300, and a rear cover 400 that are sequentially arranged in the thickness direction. Among them, the middle frame 300 includes a middle plate 310 and a frame 320 surrounding the periphery of the middle plate 310. The frame 320 is a conductive frame, such as a metal frame. Accommodation spaces are formed between the display screen 200 and the middle plate 310, and between the middle plate 310 and the rear cover 400 to accommodate devices such as the main board 600, the camera module, the receiver module, the battery 700, the secondary board 800, and various sensors. One side of the frame 320 in the thickness direction surrounds the edge of the display screen 200, and the other side of the frame 320 in the thickness direction surrounds the edge of the rear cover 400 to form a complete appearance structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, and the frame 320 and the rear cover 400 are a split structure. The above is the working environment of the antenna assembly 100 taking a mobile phone as an example, but the antenna assembly 100 of the present application is not limited to the above working environment.

[0033] Please refer to Figure 3 , Figure 3 FIG. 14 is a partial rear view of the electronic device 1000 with the rear cover 400 removed. The frame 320 includes a top frame 321 and a bottom frame 324 that are oppositely arranged, and a first side frame 322 and a second side frame 323 connecting the top frame 321 and the bottom frame 324. Among them, the top frame 321 is the side away from the ground when the user holds and uses the electronic device 1000 in a vertical screen manner, and the bottom frame 324 is the side facing the ground when the user holds and uses the electronic device 1000 in a vertical screen manner. The first side frame 322 is the left side when the user holds and uses the electronic device 1000 in a vertical screen manner. The second side frame 323 is the right side when the user holds and uses the electronic device 1000 in a vertical screen manner. Of course, the first side frame 322 can also be the right side when the user holds and uses the electronic device 1000, and the second side frame 323 is the left side when the user holds and uses the electronic device 1000.

[0034] For the convenience of description, the length direction Y is defined as the extending direction of the first side frame 322 and the second side frame 323 of the electronic device 1000 (which can also be called the long side direction), and the width direction X is defined as the extending direction of the top frame 321 and the bottom frame 324 of the electronic device 1000 (which can also be called the short side direction).

[0035] Optionally, the top frame 321 is a straight frame. The main parts in the middle of the first side frame 322 and the second side frame 323 are both straight frames, and the two ends are bent frames. Among them, the bending angles of the bent frames at both ends of the first side frame 322 are both close to or 90°. The bending angles of the bent frames at both ends of the second side frame 323 are both close to or 90°. Among them, the bent frames are bent in an arc. The bottom frame 324 is a straight frame.

[0036] Please refer to Figure 2 , the electronic device 1000 further includes a reference floor 500. The reference floor 500 is disposed within the frame 320. The shape of the reference floor 500 is generally rectangular. Because components are arranged as needed or other structures are avoided in the mobile phone, various slots, holes, etc. are opened on the reference ground edge of the reference floor 500. The reference floor 500 includes but is not limited to the metal alloy part of the middle plate 310 and the reference ground metal part of the circuit board (including the main board 600 and the secondary board 800). Generally speaking, the reference floor in the electronic device 1000 can be equivalently regarded as a roughly rectangular shape, so it is called the reference floor 500. Among them, the reference floor 500 does not indicate that the shape of the reference ground is plate-shaped and is a rectangular plate.

[0037] The following takes the accompanying drawings as an example to illustrate the specific structure of the antenna assembly 100 provided in the first embodiment.

[0038] Please refer to Figure 3 and Figure 4 , the antenna assembly 100 includes a radiator 10 and a feed source 20. The radiator 10 is arranged at intervals along the edge of the reference floor 500. Optionally, the radiator 10 can be disposed on the frame 320 or be a part of the frame 320.

[0039] This application does not make specific limitations on the material of the radiator 10. Optionally, the material of the radiator 10 is a conductive material, including but not limited to conductive materials such as metal and alloy. This application does not make specific limitations on the shape of the radiator 10. For example, the shape of the radiator 10 includes but is not limited to strip-shaped, sheet-shaped, rod-shaped, coating-shaped, film-shaped, etc. Figure 3The radiator 10 shown is only an example and does not limit the shape of the radiator 10 provided by this application. In this embodiment, the radiators 10 are all strip-shaped. This application does not limit the extension trajectory of the radiator 10. Optionally, the radiator 10 can extend along a straight line, or along a curve, or along a bent line. The above-mentioned radiator 10 can be a line with a uniform width on the extension trajectory, or a strip with a gradually changing width, a widened area, etc., with unequal widths.

[0040] This application does not specifically limit the form of the radiator 10. Optionally, the forms of the radiator 10 include but are not limited to a metal frame 320, a metal frame embedded in a plastic frame 320, a metal radiator 10 located inside or on the surface of the frame 320, a flexible circuit board antenna formed on a Flexible Printed Circuit board (FPC), a Laser Direct Structuring (LDS) antenna, a Print Direct Structuring (PDS) antenna, a conductive sheet antenna (such as a metal bracket antenna), etc. In this embodiment, an example is given where the radiator 10 is a part of the metal frame 320 of the electronic device 1000.

[0041] The feed source 20 includes but is not limited to a radio frequency transceiver chip and a radio frequency front-end circuit, etc.

[0042] Please refer to Figure 3 and Figure 4 , the feed source 20 is electrically connected to the feeding point A. The electrical connection described in this application includes a direct electrical connection between two structures, or an indirect electrical connection through other components. In this embodiment, the feed source 20 and the feeding point A are indirectly electrically connected through a radio frequency transmission line, a feeding elastic sheet, etc.

[0043] Optionally, please refer to Figure 3 and Figure 4 , the antenna assembly 100 includes a matching circuit M1. The matching circuit M1 is electrically connected between the feed source 20 and the feeding point A. The matching circuit M1 includes at least one of a capacitor and an inductor, and the matching circuit M1 is used to tune the impedance matching between the feed source 20 port and the radiator 10 port.

[0044] Optionally, please refer to Figures 5a to 5h, the matching circuit M1 includes, but is not limited to, a series circuit of an inductor and a capacitor; or, a parallel circuit of an inductor and a capacitor; or, a series circuit of a parallel branch formed by an inductor and a capacitor and a capacitor; or, a series circuit of a parallel branch formed by an inductor and a capacitor and an inductor; or, a parallel circuit of a series branch formed by an inductor and a capacitor and a capacitor; or, a parallel circuit of a series branch formed by an inductor and a capacitor and an inductor; or, a series connection of a first parallel branch formed by an inductor and a capacitor and a second parallel branch formed by an inductor and a capacitor; or, a parallel connection of a first series branch formed by an inductor and a capacitor and a second series branch formed by an inductor and a capacitor. The matching circuit M1 may also include adjustable devices such as switches and variable capacitors.

[0045] Specifically, the feed source 20 can at least provide a radio frequency excitation signal in a first frequency band. The radiator 10 can provide an electrical length of 1 / 4 wavelength that supports the first frequency band. In this way, the feed source 20 can excite the radiator 10 to support the first frequency band. Specifically, the feed source 20 is used to excite a first resonance mode that supports the first frequency band on the radiator 10. In other words, the branch resonance current of the first resonance mode is mainly distributed on the radiator 10. In addition, the first resonance mode also forms a floor current on the reference floor 500.

[0046] Among them, the present application does not make specific limitations on the size of the first frequency band. Optionally, the first frequency band includes, but is not limited to, at least one of the LB frequency band (less than 1 GHz), MHB frequency band (1 - 3 GHz), UHB frequency band (greater than 3 GHz), Wi-Fi frequency band, GPS frequency band, etc. For example, the first frequency band is the MHB frequency band, such as the N41 frequency band.

[0047] Please refer to Figure 6 and Figure 7 , when the feed source 20 excites the radiator 10 to operate in the first frequency band, the floor current mode excited on the reference floor 500 is the same as the characteristic current mode of the reference floor 500.

[0048] It should be noted that the reference floor 500 is made of a conductive material. When the frequency excited by the feed source 20 (such as the aforementioned feed source 20) is suitable (defined as the first frequency band in the present application), the reference floor 500 can act as a "radiation structure" for radiation under the action of the feed source 20 (such as the aforementioned feed source 20), thereby improving the radiation efficiency when operating at this frequency.

[0049] Among them, the characteristic current mode of the reference floor 500 is the resonance current mode formed when the reference floor 500 is "regarded as" a part of the radiator 10. For example, generally, the size of the reference floor 500 in the length direction Y is close to 2 times the size of the reference floor 500 in the width direction X.

[0050] In an alternative embodiment, the feed 20 is capable of providing an excitation current in a first frequency band. The size (electrical length) of the reference ground plane 500 in the length direction Y is close to 1 wavelength of the first frequency band, and the size (electrical length) of the reference ground plane 500 in the width direction X is close to 1 / 2 wavelength of the first frequency band. This facilitates the formation of a current pattern close to 1 wavelength of the first frequency band in the length direction Y on the reference ground plane 500 under the excitation of the feed 20, and the formation of a current pattern close to 1 / 2 wavelength of the first frequency band in the width direction X on the reference ground plane 500 under the excitation of the feed 20. Thus, the antenna assembly can fully excite its reference ground plane 500 as a "radiating structure" to radiate at the first frequency band, thereby improving the radiation efficiency at the first frequency band.

[0051] For example, the length range of the reference ground plane 500 is close to 8 - 12 cm, the width range of the reference ground plane 500 is close to 5 - 7 cm, and the center frequency of the first frequency band is about 2.1 - 3 GHz.

[0052] As defined in this application, please refer to Figure 6 , the current pattern close to 1 wavelength of the first frequency band formed by the reference ground plane 500 in the length direction Y and the current pattern of 1 / 2 wavelength of the first frequency band formed in the width direction X are the characteristic current patterns of the reference ground plane 500.

[0053] Specifically, through the current simulation diagram of the reference ground plane 500, a current distribution of weak - strong - weak - strong - weak can be seen in sequence along the edge of the reference ground plane 500 in the length direction Y, and on the length direction Y, the current directions on both sides of the center position of the reference ground plane 500 are opposite. Thus, it shows that the reference ground plane 500 forms a current pattern close to 1 wavelength of the first frequency band in the length direction Y under the excitation of the feed 20.

[0054] Specifically, through the current simulation diagram of the reference ground plane 500, a current distribution of weak - strong - weak can be seen in sequence along the edge of the reference ground plane 500 in the width direction X, and on the width direction X, the current directions on both sides of the center position of the reference ground plane 500 are the same. Thus, it shows that the reference ground plane 500 forms a current pattern close to 1 / 2 wavelength of the first frequency band in the width direction X under the excitation of the feed 20.

[0055] As can be seen from the above, the reference ground plane 500 can form a current pattern close to 1 wavelength of the first frequency band in the length direction Y and a current pattern of 1 / 2 wavelength of the first frequency band in the width direction X, enabling the reference ground plane 500 to serve as a "radiating structure" for the first frequency band, thereby improving the radiation efficiency at the first frequency band.

[0056] In another alternative embodiment, the feed source 20 can provide an excitation current in a first frequency band. The dimension (electrical length) of the reference ground plane 500 in the length direction Y is close to 1 / 2 wavelength of the first frequency band, and the dimension (electrical length) of the reference ground plane 500 in the width direction X is close to 1 / 4 wavelength of the first frequency band. So that the reference ground plane 500 can form a current pattern close to 1 / 2 wavelength of the first frequency band in the length direction Y under the excitation of the feed source 20, and the reference ground plane 500 can form a current pattern close to 1 / 4 wavelength of the first frequency band in the width direction X under the excitation of the feed source 20. In this way, the antenna assembly can fully excite its reference ground plane 500 as a "radiation structure" to radiate near the first frequency band, thereby improving the radiation efficiency of the first frequency band.

[0057] This application defines that the current pattern close to 1 / 2 wavelength of the first frequency band formed by the reference ground plane 500 in the length direction Y and the current pattern of 1 / 4 wavelength of the first frequency band formed in the width direction X are the characteristic current patterns of the reference ground plane 500.

[0058] For example, the length range of the reference ground plane 500 is close to 8 - 12 cm, the width range of the reference ground plane 500 is close to 5 - 7 cm, and the center frequency of the first frequency band is about 1 - 1.5 GHz.

[0059] In another alternative embodiment, the feed source 20 can provide an excitation current in a first frequency band. The dimension (electrical length) of the reference ground plane 500 in the length direction Y is close to 2 times the wavelength of the first frequency band, and the dimension (electrical length) of the reference ground plane 500 in the width direction X is close to 1 times the wavelength of the first frequency band. So that the reference ground plane 500 can form a current pattern close to 2 times the wavelength of the first frequency band in the length direction Y under the excitation of the feed source 20, and the reference ground plane 500 can form a current pattern close to 1 times the wavelength of the first frequency band in the width direction X under the excitation of the feed source 20. In this way, the antenna assembly can fully excite its reference ground plane 500 as a "radiation structure" to radiate near the first frequency band, thereby improving the radiation efficiency of the first frequency band.

[0060] This application defines that the current pattern close to 2 times the wavelength of the first frequency band formed by the reference ground plane 500 in the length direction Y and the current pattern of 1 times the wavelength of the first frequency band formed in the width direction X are the characteristic current patterns of the reference ground plane 500.

[0061] For example, the length range of the reference ground plane 500 is close to 8 - 12 cm, the width range of the reference ground plane 500 is close to 5 - 7 cm, and the center frequency of the first frequency band is about 4 - 6 GHz.

[0062] Furthermore, when the feeder 20 drives the radiator 10 to operate in the first frequency band, a stub resonance current is formed on the radiator 10, and a floor current pattern is also formed on the reference ground plane 500. The position of the radiator 10 affects the current distribution on the reference ground plane 500. For example, the grounding point of the radiator 10 is a current strong point, where a relatively strong current flows to the ground. Thus, a relatively strong downward current is formed at the connection point of the reference ground plane 500 and the grounding point of the radiator 10. Further, if the grounding point of the radiator 10 is electrically connected to the long side of the reference ground plane 500, a relatively strong downward current is formed on the long side of the reference ground plane 500. This downward current flows along both sides of the long side direction, forming a reverse current on the reference ground plane 500, thereby breaking the original current pattern on the long side of the reference ground plane 500, and the original characteristic current pattern in the long side direction is damaged. In addition, if the grounding point of the radiator 10 is also electrically connected to the short side position of the reference ground plane 500, a relatively strong downward current is formed on the short side of the reference ground plane 500. This downward current flows along both sides of the short side direction, forming a reverse current on the reference ground plane 500, thereby breaking the original current pattern on the short side of the reference ground plane 500, and the original characteristic current pattern in the short side direction is damaged.

[0063] Since the characteristic current pattern of the reference ground plane 500 in the first frequency band is damaged, the radiation efficiency of the reference ground plane 500 in the first frequency band is reduced. The reasons for the reduction include, but are not limited to, that the original characteristic current pattern in the short side direction of the reference ground plane 500 is a 1 / 2 co-directional current pattern in the first frequency band. The grounding point of the radiator 10 is electrically connected to the short side of the reference ground plane 500, and a relatively strong downward current is formed on the short side of the reference ground plane 500. This downward current flows along both sides of the short side direction, forming a reverse current on the reference ground plane 500, which is equivalent to a reduction in the co-directional current path on the reference ground plane 500, reducing the radiation aperture of the reference ground plane 500 as a "radiation structure", and thus reducing the radiation efficiency in the far field.

[0064] As can be seen from the above, when the floor current pattern excited and formed on the reference ground plane 500 by the radiator 10 when operating in the first frequency band is different from the characteristic current pattern of the reference ground plane 500, that is, when the floor current pattern excited and formed on the reference ground plane 500 by the radiator 10 when operating in the first frequency band damages the original characteristic current pattern of the reference ground plane 500, the efficiency in the first frequency band decreases.

[0065] The electronic device 1000 provided in this application, the electronic device 1000 includes a reference floor 500 and an antenna assembly 100. The antenna assembly 100 includes a radiator 10 and a feed source 20. The radiators 10 are arranged at intervals along the edge of the reference floor 500. The feed source 20 is electrically connected to the radiator 10. The feed source 20 is used to excite the radiator 10 to support the first frequency band. Among them, when the radiator 10 operates in the first frequency band, the floor current mode excited on the reference floor 500 is the same as the characteristic current mode of the reference floor 500. This application provides a design and layout of the antenna assembly 100, so that the floor current formed by the excitation of the radiator 10 on the floor is the same as the characteristic current mode of the floor. That is, when the feed source 20 excites the radiator 10 to operate in the first frequency band, it also fully excites the characteristic current mode on the reference floor 500, and fully excites the reference floor 500 as the "radiation structure" of the first frequency band, thereby increasing the radiation area of the first frequency band and avoiding the problem of efficiency decline caused by different floor current modes of the excitation floor current and the floor, and improving the operating efficiency of the antenna assembly 100 in the first frequency band.

[0066] Specifically, please refer to Figure 6 , the edge of the reference floor 500 includes a first long side 502, a first short side 501, a second long side 503 and a second short side 504 connected in sequence.

[0067] Among them, please refer to Figure 6 , the first long side 502 extends along the length direction Y and is arranged along the first side frame 322. The first short side 501 extends along the width direction X and is arranged along the top frame 321. The second long side 503 extends along the length direction Y and is arranged along the second side frame 323. The second short side 504 extends along the width direction X and is arranged along the bottom frame 324.

[0068] Please refer to Figure 4 , the radiator 10 includes a main radiation branch 11.

[0069] Please refer to Figure 4 , the main radiation branch 11 includes a grounding point D1, a feeding point A and a first open end E1 arranged in sequence.

[0070] The main radiation branch 11 is a part of the frame 320. In this application, the open end refers to the end that is disconnected from other conductive parts on the frame 320 through an insulating gap and is disconnected from the reference floor 500. In order to ensure the structural strength of the frame 320 of the electronic device 1000, the above insulating gap is filled with an insulating material.

[0071] The grounding point D1 described in this application is electrically connected to the reference floor 500. Among them, the electrical connection method includes but is not limited to the grounding point D1 returning to the ground through a grounding spring piece; or, the grounding point D1 and the reference floor 500 are interconnected as a whole, that is, through a physical grounding method.

[0072] The feeding point A is located between the first opening end E1 and the grounding point D1. The specific position of the feeding point A in this application is not limited. Optionally, the feeding point A can be a bump protruding towards the reference floor 500 inside the frame 320.

[0073] Please refer to Figure 4 , the feeding point A is electrically connected to the feed source 20. Further, the matching circuit M1 is electrically connected between the feeding point A and the feed source 20. The grounding point D1 is electrically connected to the first short side 501 of the reference floor 500.

[0074] In this embodiment, by electrically connecting the grounding point D1 of the main radiation branch 11 to the first short side 501 of the reference floor 500, the characteristic current mode in the length direction Y of the reference floor 500 is avoided from being damaged, and further, when the feed source 20 excites the radiator 10 to work in the first frequency band, it is easier to excite the characteristic current mode in the length direction Y of the reference floor 500.

[0075] Specifically, please refer to Figure 8 , the size of the first short side 501 of the reference floor 500 is close to 1 / 2 wavelength of the first frequency band, and the size of the first long side 502 of the reference floor 500 is close to 1 times wavelength of the first frequency band. Taking the N41 frequency band as an example for the first frequency band. The characteristic current mode of the reference floor 500 includes forming a 1 / 2 wavelength mode supporting the first frequency band in the width direction X, and the reference floor 500 forms a 1 times wavelength mode supporting the first frequency band in the length direction Y.

[0076] Among them, please refer to Figure 8 , through the current simulation diagram on the reference floor 500, a current distribution of weak - strong - weak can be seen in sequence along the edge of the reference floor 500 in the width direction X, and in the width direction X, the current directions on both sides of the center position of the reference floor 500 are the same. Thus, it shows that the reference floor 500 forms a co - direction current mode close to 1 / 2 wavelength of the first frequency band under the excitation of the feed source 20 in the width direction X.

[0077] Among them, please refer to Figure 8 , through the current simulation diagram on the reference floor 500, a current distribution of weak - strong - weak - strong - weak can be seen in sequence along the edge of the reference floor 500 in the length direction Y, and in the length direction Y, the current directions on both sides of the center position of the reference floor 500 are opposite. Thus, it shows that the reference floor 500 forms a current mode close to 1 times wavelength of the first frequency band under the excitation of the feed source 20 in the length direction Y.

[0078] Please refer to Figure 9, the present application also provides a schematic diagram of the floor current distribution when the grounding point D1 of the main radiation stub 11 is electrically connected to the first long side 502 of the reference floor 500. It can be seen from the schematic diagram of the current distribution that since the grounding point D1 of the main radiation stub 11 is electrically connected to the first long side 502 of the reference floor 500, a strong downward current is formed at the connection point D1 of the reference floor 500 to the grounding point of the radiator 10, and a strong downward current is formed on the long side of the reference floor 500. This downward current flows along both sides in the long side direction, forming a reverse current on the reference floor 500, thereby breaking the original characteristic current mode (1-fold current mode) on the long side of the reference floor 500. The original characteristic current mode in the long side direction is damaged, reducing the radiation contribution of the reference floor 500 as a "radiation structure", and thus relatively reducing the radiation efficiency of the first frequency band.

[0079] In this embodiment, please refer to Figure 7 , when the radiator 10 operates in the first frequency band, the reference floor 500 forms a 1 / 2 wavelength mode supporting the first frequency band on the first short side 501, and the reference floor 500 forms a 1-fold wavelength mode supporting the first frequency band on the first long side 502, so that the floor current mode excited on the reference floor 500 when the radiator 10 operates in the first frequency band is the same as the characteristic current mode of the reference floor 500. When ensuring that the feed 20 excites the radiator 10 to operate in the first frequency band, the characteristic current mode on the reference floor 500 is fully excited, fully exciting the reference floor 500 as a "radiation structure" in the first frequency band, increasing the radiation aperture in the first frequency band, and improving the radiation efficiency of the first frequency band.

[0080] Further optionally, please refer to Figure 7 , the orthographic projection of the main radiation stub 11 on the reference floor 500 is located within the range of the first short side 501, and the main radiation stub 11 is arranged along the first short side 501. The main radiation stub 11 is disposed opposite to the first short side 501.

[0081] In this embodiment, by arranging the main radiation stub 11 along the first short side 501 of the reference floor 500, in this way, the resonant current on the main radiation stub 11 has little influence on the current mode in the long side direction of the reference floor 500, so that the current mode in the long side direction of the reference floor 500 excited by the feed 20 and the main radiation stub 11 is close to the characteristic current mode in the long side direction of the reference floor 500, exciting the reference floor 500 to act as a "radiation structure" in the first frequency band at least in the long side direction, increasing the radiation aperture in the first frequency band, and improving the radiation efficiency of the first frequency band.

[0082] Optionally, please refer to Figure 7, the distance between the orthogonal projection of the grounding point D1 on the first short side 501 and the first long side 502 is in the range of 4 to 8 mm. Specifically, the distance between the orthogonal projection of the grounding point D1 on the first short side 501 and the first long side 502 includes but is not limited to 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, or a value between any two of these data.

[0083] If the distance between the orthogonal projection of the grounding point D1 on the first short side 501 and the first long side 502 is too small, it may cause a relatively large grounding current at the first grounding point D1 to affect the current pattern in the long side direction on the reference ground plane 500, causing the current pattern excited by the feed 20 and the main radiation stub 11 in the long side direction of the reference ground plane 500 to be different from the characteristic current pattern of the reference ground plane 500 in the long side direction.

[0084] When the radiator 10 operates in the first frequency band, the current intensity at the grounding point D1 on the main radiation stub 11 is greater than the current intensity at the first open end E1. Therefore, the grounding point D1 of the main radiation stub 11 is a current intensity strong point.

[0085] If the distance between the orthogonal projection of the grounding point D1 on the first short side 501 and the first long side 502 is too large, for example, the orthogonal projection of the grounding point D1 on the first short side 501 is near the center position of the first short side 501. On the one hand, it may cause a relatively strong grounding current at the grounding point D1 to form a reverse current on the first short side 501, destroying the 1 / 2 co-directional current pattern originally formed by the reference ground plane 500 in the width direction X. On the other hand, it may cause the relatively large grounding current at the first grounding point D1 to be superimposed on the current strong region of the reference ground plane 500, resulting in a relatively large SAR (Specific Absorption Rate) value at the first grounding point D1. In order to reduce the SAR risk, power back-off is required when operating in the first frequency band.

[0086] In this embodiment, by electrically connecting the grounding point D1 of the main radiation stub 11 to a position on the first short side 501 close to the first long side 502, for example, the distance between the orthogonal projection of the grounding point D1 on the first short side 501 and the first long side 502 is in the range of 4 to 8 mm, it is not only possible to reduce the influence of the relatively large grounding current at the first grounding point D1 on the current pattern in the long side direction on the reference ground plane 500, but also to avoid the coincidence of the relatively large grounding current at the first grounding point D1 with the current strong region of the reference ground plane 500, reducing the SAR risk at the first grounding point D1, eliminating the need for power back-off, or reducing the power back-off.

[0087] Optionally, the characteristic current pattern of the reference floor 500 forms a plurality of current strong regions and a plurality of current weak regions at the edge of the reference floor 500. The current strong regions and the current weak regions are alternately arranged in sequence along the circumference of the reference floor 500.

[0088] The ground point D1 is electrically connected to one of the current weak regions.

[0089] Further by way of example, the first frequency band includes the N41 frequency band or the Wi-Fi 2.4G frequency band.

[0090] Please refer to Figure 10 , the characteristic current pattern of the reference floor 500 is a 1 / 2 wavelength pattern of the first frequency band in the short side direction. When the radiator 10 operates in the first frequency band, the first short side 501 of the reference floor 500 is successively the first short side current weak region 5011, the first short side current strong region 5012, and the second short side current weak region 5013. Among them, the current of the first short side current weak region 5011 is less than the current of the first short side current strong region 5012. The current of the second short side current weak region 5013 is less than the current of the first short side current strong region 5012. Optionally, the ground point D1 is electrically connected to the first short side current weak region 5011.

[0091] It should be noted that the overall SAR hot spot of the electronic device 1000 is formed by the superposition of the SAR hot spot of the main radiation branch 11 and the SAR hot spot on the reference floor 500. If the positions of the SAR hot spot of the main radiation branch 11 and the SAR hot spot on the reference floor 500 are directly opposite, it will cause the overall SAR hot spot of the electronic device 1000 to be relatively large and the risk of exceeding the SAR to be relatively large. For example, the SAR hot spot of the main radiation branch 11 is near the ground point D1 of the main radiation branch 11, and the SAR hot spot of the reference floor 500 is in the first short side current strong region 5012.

[0092] If the ground point D1 of the main radiation branch 11 is electrically connected to the first short side current strong region 5012 of the reference floor 500, it may cause the overall SAR hot spot of the electronic device 1000 to be relatively large and the risk of exceeding the SAR to be relatively large.

[0093] Based on the foregoing, the ground point D1 of the main radiation branch 11 is electrically connected to the current weak region of the first short side 501 of the reference floor 500. Therefore, it can disperse the SAR hot spot of the main radiation branch 11 and the SAR hot spot on the reference floor 500 to a certain extent, disperse the overall SAR, and thus reduce the Body SAR of both the short side and the long side of the electronic device 1000, reducing the risk of exceeding the SAR of the Body SAR of the short side and the long side of the electronic device 1000, without the need for power back-off.

[0094] Please refer to Figure 10The distance between the first short side current strong area 5012 and the first long side 502 is greater than 8 mm. Therefore, when the distance between the orthographic projection of the grounding point D1 on the first short side 501 and the first long side 502 is within the range of 4 to 8 mm, the grounding point D1 is electrically connected to the first short side current weak area 5011.

[0095] For further optional information, see Figure 11 The radiator 10 further includes a parasitic radiation branch 12. The parasitic radiation branch 12 includes a second opening end E2 and a connection point F. A coupling gap is formed between the first opening end E1 and the second opening end E2.

[0096] The material, shape, form, etc. of the parasitic radiation branch 12 may refer to the material, shape, form, etc. of the aforementioned radiator 10 .

[0097] The present application does not specifically limit the size of the coupling gap G1. Optionally, the spacing of the coupling gap G1 is greater than 0.5 mm and less than 2 mm, but is not limited to this size. When the main radiation branch 11 and the parasitic radiation branch 12 are both part of the frame 320, the coupling gap G1 is a gap opened on the frame 320. In addition, the coupling gap G1 is filled with an insulating gap to ensure the structural strength of the frame 320.

[0098] The main radiation branch 11 and the parasitic radiation branch 12 can generate capacitive coupling through the coupling gap G1. In one angle, the main radiation branch 11 and the parasitic radiation branch 12 can be regarded as two parts formed by the frame 320 being separated by the coupling gap G1. Among them, "capacitive coupling" means that the coupling gap G1 between the main radiation branch 11 and the parasitic radiation branch 12 generates an electric field, and the signal of the main radiation branch 11 can be transmitted to the parasitic radiation branch 12 through the electric field, so that the main radiation branch 11 and the parasitic radiation branch 12 can achieve electrical signal conduction even when they are not directly electrically connected.

[0099] See also Figure 11 When the radiator 10 operates in the first frequency band, the main radiation branch 11 and the parasitic radiation branch 12 both form a unidirectional current supporting the first frequency band.

[0100] In this embodiment, by providing the parasitic radiation stub 12, the parasitic radiation stub 12 and the main radiation stub 11 form a mouth-to-mouth antenna. The feed source 20 excites the radiation mode of the mouth-to-mouth antenna formed on the main radiation stub 11 and the parasitic radiation stub 12, that is, the same-direction currents are formed on the parasitic radiation stub 12 and the main radiation stub 11, increasing the radiation aperture of the stub during the operation of the first frequency band and improving the efficiency of the first frequency band. Combining the foregoing, the embodiment of the present application can not only fully excite the characteristic current modes of the reference ground plane 500 in the length direction Y and the width direction X by adjusting the grounding position of the main radiation stub 11, but also further increase the radiation aperture on the radiation stub to further improve the radiation efficiency of the first frequency band.

[0101] In this embodiment, the orthogonal projection of the connection point F on the first short side 501 is located in the first short side current strong region 5012. If the connection point F is directly electrically connected to the reference ground plane 500, then the connection point F will be electrically connected to the first short side current strong region 5012 on the first short side 501. The connection point F forms a position of direct grounding. At this time, there will be a relatively strong current flowing to the ground at the connection point F. This relatively strong downward current flows toward both sides along the first short side 501, thereby causing the 1 / 2 wavelength same-direction current of the original first short side 501 of the reference ground plane 500 to be damaged, reducing the radiation contribution of the reference ground plane 500 as a "radiation structure", and thus relatively reducing the radiation efficiency of the first frequency band.

[0102] Based on the above problems, please refer to Figure 11 , the antenna assembly 100 further includes a tuning element M2. One end of the tuning element M2 is electrically connected to the connection point F, and the other end of the tuning element M2 is electrically connected to the reference ground plane 500.

[0103] Optionally, the tuning element M2 includes, but is not limited to, a series circuit of an inductor and a capacitor; or, a parallel circuit of an inductor and a capacitor; or, a series circuit of a parallel branch formed by an inductor and a capacitor and a capacitor; or, a series circuit of a parallel branch formed by an inductor and a capacitor and an inductor; or, a parallel circuit of a series branch formed by an inductor and a capacitor and a capacitor; or, a parallel circuit of a series branch formed by an inductor and a capacitor and an inductor; or, a series connection of a first parallel branch formed by an inductor and a capacitor and a second parallel branch formed by an inductor and a capacitor; or, a parallel connection of a first series branch formed by an inductor and a capacitor and a second series branch formed by an inductor and a capacitor. The tuning element M2 may also include adjustable devices such as switches and variable capacitors.

[0104] Specifically, the tuning element M2 includes a capacitive element. Further, the tuning element M2 includes a small capacitor.

[0105] In this embodiment, by disposing a capacitive element between the connection point F and the reference ground plane 500, compared with the direct grounding of the connection point F, the conduction performance of the capacitive element is relatively weak. Thus, the current flowing to the ground from the connection point F through the parasitic radiation stub 12 is relatively weak, so as to reduce the influence of the current on the parasitic radiation stub 12 on the characteristic current mode of the reference ground plane 500 in the width direction X. Furthermore, the current mode excited by the main radiation stub 11 in the short side direction of the reference ground plane 500 is close to the characteristic current mode of the reference ground plane 500 in the short side direction, and the reference ground plane 500 is excited to act as a "radiation structure" in the first frequency band at least in the short side direction, increasing the radiation aperture in the first frequency band and improving the radiation efficiency in the first frequency band.

[0106] Optionally, the feed source 20 is further configured to excite the radiator 10 to support a second frequency band.

[0107] Optionally, the feed source 20 further provides an excitation signal for the second frequency band. The second frequency band is different from the first frequency band.

[0108] Wherein, the present application does not specifically limit the size of the second frequency band. Optionally, the second frequency band includes but is not limited to at least one of the LB frequency band (less than 1 GHz), MHB frequency band (1 - 3 GHz), UHB frequency band (greater than 3 GHz), Wi-Fi frequency band, GPS frequency band, etc. For example, the second frequency band is the GPS frequency band, such as the GPS-L1 frequency band.

[0109] The resonant current of the radiator 10 in the second frequency band is mainly distributed on the main radiation stub 11. Further, the electrical length of the main radiation stub 11 is close to 1 / 4 wavelength in the GPS-L1 frequency band, so as to facilitate the feed source 20 to excite a 1 / 4 wavelength mode supported on the main radiation stub 11 in the GPS-L1 frequency band.

[0110] The antenna assembly 100 provided in this embodiment can not only support multiple frequency bands, such as the first frequency band and the second frequency band, but also, in the first frequency band, can fully excite the characteristic current mode on the reference ground plane 500, make the reference ground plane 500 act as a radiation structure in the first frequency band, and also excite co-directional currents supported in the first frequency band on the main radiation stub 11 and the parasitic radiation stub 12, thereby increasing the radiation aperture in the first frequency band and improving the efficiency in the first frequency band.

[0111] Further optionally, the antenna assembly 100 further includes other feed sources, and the feed source is electrically connected to the parasitic radiation stub 12 to excite the parasitic radiation stub 12 to support more frequency bands, such as the Wi-Fi 5G frequency band, N78 frequency band, etc.

[0112] Optionally, when the number of antenna assemblies 100 is one, the main radiation branch 11 and the parasitic radiation branch 12 of the antenna assembly 100 can be disposed at a position on the top border 321 close to the first side border 322. In other embodiments, the main radiation branch 11 and the parasitic radiation branch 12 of the antenna assembly 100 can also be disposed at a position on the top border 321 close to the second side border 323. In other embodiments, the main radiation branch 11 and the parasitic radiation branch 12 of the antenna assembly 100 can also be disposed at a position on the bottom border 324 close to the first side border 322. In other embodiments, the main radiation branch 11 and the parasitic radiation branch 12 of the antenna assembly 100 can also be disposed at a position on the bottom border 324 close to the second side border 323.

[0113] Of course, the number of antenna assemblies 100 can also be multiple, and multiple antenna assemblies 100 can be respectively disposed at multiple positions among the positions on the top border 321 close to the first side border 322, the position on the top border 321 close to the second side border 323, the position on the bottom border 324 close to the first side border 322, and the position on the bottom border 324 close to the second side border 323.

[0114] In the comparative example, please refer to Figure 9 , taking the antenna assembly 100 disposed at the upper left corner of the electronic device 1000 as an example. The antenna ground return position at the upper left corner is at a position close to the middle of the first long side 502 and the first short side 501 of the reference floor 500. Affected by the grounding position, when the N41 frequency band is excited, there is a difference between the resonant current of the reference floor 500 and the characteristic current mode of the reference floor 500 itself.

[0115] Please refer to Figure 8 , the characteristic current mode of the reference floor 500 itself is the half-wavelength mode of the short side and the one-wavelength mode of the long side.

[0116] Please refer to Figure 9 , two discontinuity points are introduced to the reference floor 500 in the comparative example, resulting in the current reversing on both sides of this point and changing the original characteristic current mode of the reference floor 500. When the resonant current of the reference floor 500 is different from the characteristic current mode of the reference floor 500 itself, it will lead to a decrease in the efficiency of the operating frequency band.

[0117] When the current strong points of the radiation branches are superimposed on the current strong points of the reference floor 500, its SAR value will increase. In the comparative example, since the radiation branches are grounded at the edge position of the first long side 502 of the reference floor 500 and at the middle position of the first short side 501 of the reference floor 500. From Figure 8 and Figure 9As can be seen from the comparison, the current distribution of the reference floor 500 in the comparative example does not conform to the characteristic current pattern of the reference floor 500 in the antenna radiation area, and the comparative example generates an in-phase current with the characteristic current pattern on the reference floor 500. At this time, the antenna efficiency does not reach the optimum. At the same time, since the current strong point of the antenna radiation stub is superimposed on the characteristic mode current strong point of the reference floor 500, the SAR value increases. Therefore, the antenna efficiency of the comparative example is low and the SAR is high.

[0118] Please refer to Figure 11 , in the mobile phone system, the efficiency and SAR value of the antenna are composed of two parts: the antenna radiation stub and the reference floor 500. The position design of the antenna in the comparative example does not consider the influence of the reference floor 500 current on the antenna efficiency and SAR. In order to better excite the reference floor 500 current, in this application, the antenna ground return position (the aforementioned ground connection point D1) is located on the short side and 4-8 mm away from the end, which can better excite the reference floor 500 characteristic mode of the first long side 502 of the reference floor 500; at the same time, the antenna assembly 100 returns to the ground with a capacitor at the short side and does not directly connect to the ground to avoid destroying the characteristic current pattern of the reference floor 500 along the short side direction, so that the resonant current of the reference floor 500 when the antenna assembly 100 operates in the second frequency band is basically consistent with the distribution of the reference floor 500 characteristic current pattern, and thus the efficiency will be improved.

[0119] At this time, the current strong point of the main radiation stub 11 is only at the ground connection point D1, which is the characteristic mode current weak point area of the reference floor 500. Therefore, this embodiment disperses the SAR hot spots of the radiation stub and the SAR hot spots of the reference floor 500 to a certain extent, and disperses the SAR. Therefore, the Body SAR of the first short side 501 and the first long side 502 of the reference floor 500 will be reduced.

[0120] Please refer to Figure 12 , Figure 12 are the S-parameter curve and efficiency curve of the antenna assembly 100 provided by the embodiment of the present application. Curve a is the S-parameter curve of the antenna assembly 100 provided by the embodiment of the present application. Curve b is the radiation efficiency curve of the antenna assembly 100 provided by the embodiment of the present application. Curve c is the system efficiency curve of the antenna assembly 100 provided by the embodiment of the present application.

[0121] As can be seen from the S-parameter curve, the antenna assembly 100 provided by the embodiment of the present application can resonate in both the GPS-L1 band and the N41 band. As can be seen from the system efficiency curve, the efficiency of the antenna assembly 100 provided by the embodiment of the present application at the N41 band is close to -1.75 dB. The efficiency of the antenna assembly 100 provided by the embodiment of the present application at the GPS-L1 band is close to -2.83 dB. This shows that the antenna assembly 100 provided by the embodiment of the present application has high efficiency in both the GPS-L1 band and the N41 band.

[0122] Please refer to Figure 13 , Figure 13 which is a comparison of the efficiency curves of the antenna assembly 100 provided by the embodiment of the present application and the antenna assembly 100 provided by the comparative embodiment. Curve a is the radiation efficiency curve of the antenna assembly 100 provided by the embodiment of the present application. Curve b is the radiation efficiency curve of the antenna assembly 100 provided by the comparative embodiment. Curve c is the system efficiency curve of the antenna assembly 100 provided by the embodiment of the present application. Curve d is the system efficiency curve of the antenna assembly 100 provided by the comparative embodiment.

[0123] As can be seen from the comparison of the system efficiency curves of the antenna assembly 100 provided by the embodiment of the present application and the antenna assembly 100 provided by the comparative embodiment, the system efficiency of the antenna assembly 100 provided by the comparative embodiment at the N41 band is close to -2.35 dB. The system efficiency of the antenna assembly 100 provided by the embodiment of the present application at the N41 band is close to -1.75 dB. The system efficiency of the antenna assembly 100 provided by the embodiment of the present application at the N41 band is improved by about 0.6 dB compared with the system efficiency of the antenna assembly 100 provided by the comparative embodiment at the N41 band.

[0124] As can be seen from the comparison of the system efficiency curves of the antenna assembly 100 provided by the embodiment of the present application and the antenna assembly 100 provided by the comparative embodiment, the system efficiency of the antenna assembly 100 provided by the comparative embodiment at the GPS-L1 band is close to -3.4 dB. The system efficiency of the antenna assembly 100 provided by the embodiment of the present application at the GPS-L1 band is close to -2.83 dB. The system efficiency of the antenna assembly 100 provided by the embodiment of the present application at the GPS-L1 band is improved by about 0.5 dB compared with the system efficiency of the antenna assembly 100 provided by the comparative embodiment at the GPS-L1 band.

[0125] Please refer to Figure 10 , Figure 10It is a simulation diagram of the radiation branches of the antenna assembly 100 in the electronic device 1000 provided by this application at the first frequency band and the current distribution on the reference ground plane 500. It can be seen from the figure that by adjusting the tuning element M2, the current distribution on the reference ground plane 500 can be optimized. As can be seen from the figure, the current distributions on the long side and the short side of the reference ground plane 500 have both been improved. The long side has a distribution of 1 wavelength, and the short side has a distribution of half a wavelength, achieving a basic consistency with the characteristic current mode distribution of the reference ground plane 500, thus achieving an efficiency improvement.

[0126] The main radiation branch 11 is located on the top frame 321 and on the side close to the first side frame 322.

[0127] Please refer to Figures 14a to 14d , Figures 14a to 14d It is a comparison of SAR simulations on the side where the first side frame 322 is located and the side where the top frame 321 is located of the antenna assembly 100 in the electronic device 1000 provided by this application at the first frequency band. Figure 14a It is a schematic diagram of the SAR simulation on the side where the first side frame 322 is located when the antenna assembly 100 in the electronic device 1000 provided by this application operates at the first frequency band. Figure 14b It is a schematic diagram of the SAR simulation on the side where the first side frame 322 is located when the antenna assembly 100 provided by the comparative example operates at the first frequency band. Figure 14c It is a schematic diagram of the SAR simulation on the side where the top frame 321 is located when the antenna assembly 100 in the electronic device 1000 provided by this application operates at the first frequency band. Figure 14d It is a schematic diagram of the SAR simulation on the side where the top frame 321 is located when the antenna assembly 100 provided by the comparative example operates at the first frequency band.

[0128] Please refer to Figures 15a to 15d , Figures 15a to 15d It is a comparison of SAR simulations on the side where the display screen 200 is located and the side where the rear cover 400 is located of the antenna assembly 100 in the electronic device 1000 provided by this application at the first frequency band. Figure 15a It is a schematic diagram of the SAR simulation on the side where the display screen 200 is located when the antenna assembly 100 in the electronic device 1000 provided by this application operates at the first frequency band. Figure 15b It is a schematic diagram of the SAR simulation on the side where the display screen 200 is located when the antenna assembly 100 provided by the comparative example operates at the first frequency band. Figure 15c It is a schematic diagram of the SAR simulation on the side where the rear cover 400 is located when the antenna assembly 100 in the electronic device 1000 provided by this application operates at the first frequency band. Figure 15d It is a schematic diagram of the SAR simulation on the side where the rear cover 400 is located when the antenna assembly 100 provided by the comparative example operates at the first frequency band.

[0129] Referring to Table 1, it can be seen that the maximum SAR value on the side where the first side frame 322 is located when the antenna assembly 100 provided by the comparative example operates in the first frequency band is 3.36 W / Kg. The maximum SAR value on the side where the first side frame 322 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is 1.89 W / Kg. After being normalized to 5 dB, the maximum SAR value on the side where the first side frame 322 is located when the antenna assembly 100 provided by the present application operates in the first frequency band drops from 2.54 W / kg to 1.50 W / kg, and the SAR on the side where the first side frame 322 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is reduced by 41.6%.

[0130] Referring to Table 1, it can be seen that the maximum SAR value on the side where the top frame 321 is located when the antenna assembly 100 provided by the comparative example operates in the first frequency band is 4.24 W / Kg. The maximum SAR value on the side where the top frame 321 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is 4.37 W / Kg. After being normalized to 5 dB, the maximum SAR value on the side where the top frame 321 is located when the antenna assembly 100 provided by the present application operates in the first frequency band drops from 3.87 W / kg to 3.71 W / k, and the SAR on the side where the top frame 321 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is reduced by 4.1%.

[0131] Referring to Table 1, it can be seen that the maximum SAR value on the side where the display screen 200 is located when the antenna assembly 100 provided by the comparative example operates in the first frequency band is 8.62 W / Kg. The maximum SAR value on the side where the display screen 200 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is 7.42 W / Kg. After being normalized to 5 dB, the maximum SAR value on the side where the display screen 200 is located when the antenna assembly 100 provided by the present application operates in the first frequency band drops from 21.7 W / Kg to 16.6 W / Kg, and the SAR on the side where the display screen 200 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is reduced by 23.5%.

[0132] Referring to Table 1, it can be seen that the maximum SAR value on the side where the rear cover 400 is located when the antenna assembly 100 provided by the comparative example operates in the first frequency band is 9.43 W / Kg. The maximum SAR value on the side where the rear cover 400 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is 8.70 W / Kg. After being normalized to 5 dB, the maximum SAR value on the side where the rear cover 400 is located when the antenna assembly 100 provided by the present application operates in the first frequency band drops from 24.8 W / Kg to 18.6 W / Kg, and the SAR on the side where the rear cover 400 is located when the antenna assembly 100 provided by the present application operates in the first frequency band is reduced by 25.0%.

[0133] It is illustrated that when the antenna assembly 100 provided in this application operates in the first frequency band, the SAR values in all directions are lower than those of the antenna assembly 100 provided in the comparative example when it operates in the first frequency band.

[0134] Table 1

[0135]

[0136]

[0137] The antenna assembly 100 provided in this application not only improves the radiation efficiency of the overall frequency band, with the efficiency in the N41 frequency band increased by about 0.5 dB, but also reduces the body SAR peak value. After being normalized to 5 dB, the side SAR is reduced by 41.6%, the top SAR is reduced by 4.1%, the front SAR is reduced by 23.5%, and the rear SAR is reduced by 25%. The antenna assembly 100 provided in this application combines the characteristic current distribution of the reference ground plane 500, enabling the antenna to better excite the eigenmode of the reference ground plane 500, thus achieving the improvement of efficiency and the reduction of SAR. The radiation branches provided in this application are not limited to the metal frame / FPC / LDS / PDS process. At the same time, the antenna assembly 100 is not limited to any position and any number, nor is it limited to the operating frequency bands mentioned in the text. Multiple antennas of this form can be placed in the whole machine to achieve intelligent switching.

[0138] Although the embodiments of this application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations on this application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application, and these improvements and refinements are also considered within the protection scope of this application.

Claims

1. An electronic device, characterized in that: include: Reference floor; An antenna assembly, the antenna assembly comprising: radiators, the radiators being arranged at intervals along the edge of the reference floor; and A feed source is electrically connected to the radiator, and the feed source is used to excite the radiator to support a first frequency band, wherein a floor current pattern excited on the reference floor when the radiator operates in the first frequency band is the same as a characteristic current pattern of the reference floor.

2. The electronic device according to claim 1, wherein: The edge of the reference floor comprises a first long side, a first short side, a second long side and a second short side connected in sequence; The radiator includes a main radiating branch, and the main radiating branch includes a grounding point, a feeding point and a first open end which are arranged in sequence. The feeding point is electrically connected to the feed source, and the grounding point is electrically connected to the first short side.

3. The electronic device according to claim 1, wherein: When the radiator operates in the first frequency band, the reference floor forms a 1 / 2 wavelength mode supporting the first frequency band on the first short side; the reference floor forms a 1 times wavelength mode supporting the first frequency band on the first long side.

4. The electronic device according to claim 2, characterized in that: The orthographic projection of the main radiation branch on the reference floor is located within the range of the first short side, the main radiation branch is arranged along the first short side, and the main radiation branch is arranged opposite to the first short side.

5. The electronic device according to claim 4, characterized in that: The distance between the orthographic projection of the grounding point on the first short side and the first long side is within a range of 4 to 8 mm.

6. The electronic device according to claim 2, characterized in that: The characteristic current pattern of the reference floor forms a plurality of strong current areas and a plurality of weak current areas at the edge of the reference floor, and the strong current areas and the weak current areas are alternately arranged in sequence along the circumference of the reference floor; the grounding point is electrically connected to one of the weak current areas.

7. The electronic device according to claim 6, characterized in that: The first frequency band includes the N41 frequency band or the Wi-Fi 2.4G frequency band; When the radiator operates in the first frequency band, the first short side of the reference floor is sequentially a first short side current weak area, a first short side current strong area and a second short side current weak area; the grounding point is electrically connected to the first short side current weak area; The radiator also includes a parasitic radiation branch, which includes a second open end and a connection point, and a coupling gap is formed between the first open end and the second open end; the orthographic projection of the connection point on the first short side is located in the current strong area of ​​the first short side.

8. The electronic device according to claim 2, characterized in that: The radiator further includes a parasitic radiation branch, the parasitic radiation branch includes a second open end and a connection point, and a coupling gap is formed between the first open end and the second open end; The antenna assembly further comprises: A tuning element, one end of the tuning element is electrically connected to the connection point, and the other end of the tuning element is electrically connected to the reference ground.

9. The electronic device according to claim 7, characterized in that: The tuning element includes a capacitive element.

10. The electronic device according to claim 7, characterized in that: When the radiator operates in the first frequency band, the main radiation branch and the parasitic radiation branch both form a unidirectional current supporting the first frequency band.

11. The electronic device according to any one of claims 2 to 10, characterized in that: The feed source is also used to excite the radiator to support a second frequency band, and the resonant current of the radiator in the second frequency band is mainly distributed on the main radiation branches.

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