Antenna assembly and electronic equipment

Abstract

The invention provides an antenna assembly and electronic equipment with the antenna assembly, the antenna assembly comprises a main radiator, a parasitic radiator and a feed source, the main radiator comprises a first free end, a feeding point and a first grounding point; the parasitic radiator comprises a first radiation section and a second radiation section, the first radiation section comprises a second free end and a third free end, and a first coupling gap is formed between the first free end and the second free end; the second radiation section comprises a fourth free end and a second grounding point, and a second coupling gap is formed between the fourth free end and the third free end; the feed source is electrically connected with the feed point, the feed source is used for exciting the main radiator to form a first current mode supporting the first frequency band, the feed source is further used for exciting the parasitic radiator to support a third current mode of the third frequency band, and the multi-frequency-band coverage efficiency of the antenna can be improved in a limited space.

Description

Technical Field

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

[0002] With the development of network technology, the demand for high data transmission rates is increasing. How to improve the efficiency of multi-band antenna coverage within limited space has become a technical problem that needs to be solved. Summary of the Invention

[0003] This application provides an antenna assembly that can improve the efficiency of multi-band coverage of an antenna within a limited space, and an electronic device having the antenna assembly.

[0004] In a first aspect, this application provides an antenna assembly comprising:

[0005] The main radiator includes a first free end, a feed point, and a first grounding point;

[0006] A parasitic radiator includes a first radiating segment and a second radiating segment. The first radiating segment includes a second free end and a third free end, with a first coupling gap formed between the first free end and the second free end. The second radiating segment includes a fourth free end and a second grounding point, with a second coupling gap formed between the fourth free end and the third free end.

[0007] The feed source is electrically connected to the feed point. The feed source is used to excite the main radiator to form a first current mode supporting a first frequency band. The feed source is also used to excite the parasitic radiator to support a third current mode supporting a third frequency band.

[0008] Secondly, this application provides an electronic device, which includes a frame, a USB connector, and an antenna assembly as described in the first aspect. The frame includes a top frame, a first side frame, a bottom frame, and a second side frame connected in sequence. The main radiator and the parasitic radiator are both disposed on the bottom frame. The first radiating segment is directly opposite to and adjacent to the USB connector. A USB port is provided on the first radiating segment. The first coupling gap, the USB port, and the second coupling gap are arranged adjacent to each other in sequence.

[0009] The antenna assembly and electronic device provided in this application include an antenna assembly comprising a main radiator, a parasitic radiator, and a feed source. The main radiator includes a first free end, a feed point, and a first ground point. The parasitic radiator includes a first radiating segment and a second radiating segment. The first radiating segment includes a second free end and a third free end, with a first coupling gap formed between the first free end and the second free end. The second radiating segment includes a fourth free end and a second ground point, with a second coupling gap formed between the fourth free end and the third free end. The feed source is electrically connected to the feed point. The feed source is used to excite the main radiator to form a first current mode supporting a first frequency band. The feed source is also used to excite the parasitic radiator to support a third current mode supporting a third frequency band. Thus, the antenna assembly can support the first and third frequency bands. Furthermore, by setting the second coupling gap on the parasitic radiator, the radiator impedance of the antenna assembly is improved, resulting in deeper resonance and thus improving antenna efficiency. This enhances the efficiency of multi-band coverage of the antenna within a limited space. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below.

[0011] Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 1 ;

[0012] Figure 2 This is an exploded structural diagram of an electronic device provided in an embodiment of this application;

[0013] Figure 3 This is a schematic diagram of the structure of an electronic device with its back cover removed, according to an embodiment of this application.

[0014] Figure 4 yes Figure 3 A partially enlarged schematic diagram of an electronic device in China;

[0015] Figure 5 This is a schematic diagram of the current distribution in the first current mode of the antenna assembly provided in this application embodiment;

[0016] Figure 6 This is a schematic diagram of the current distribution in the third current mode of the antenna assembly provided in the embodiments of this application;

[0017] Figure 7 This is a current simulation diagram of the first current mode of the antenna assembly provided in the embodiments of this application;

[0018] Figure 8 This is a schematic diagram of the current distribution in the second current mode of the antenna assembly provided in this application embodiment;

[0019] Figure 9 This is a current simulation diagram of the second current mode of the antenna assembly provided in the embodiments of this application;

[0020] Figure 10 This is a current simulation diagram of the third current mode of the antenna assembly provided in the embodiments of this application;

[0021] Figure 11 The S11 parameter curves of three sets of comparative embodiments are shown, where the coupling spacing of the first coupling gap and the second coupling gap are 0.5 mm, 0.8 mm, and 1 mm, respectively.

[0022] Figure 12 This is a schematic diagram of the antenna assembly provided in the embodiments of this application. Figure 1 ;

[0023] Figure 13 The efficiency curves are for three sets of comparative embodiments where the coupling spacing of the first coupling gap and the second coupling gap are 0.5 mm, 0.8 mm, and 1 mm, respectively.

[0024] Figure 14 This is a schematic diagram of the antenna assembly provided in the embodiments of this application. Figure 2 ;

[0025] Figure 15 The coupling area of ​​the first coupling gap is 4mm. 2 4.7mm 2 The S11 parameters, radiation efficiency, and overall efficiency curves of the comparative embodiment;

[0026] Figure 16 The coupling area of ​​the second coupling gap is 5mm. 2 6.2mm 2 The S11 parameters, radiation efficiency, and overall efficiency curves of the comparative embodiment;

[0027] Figure 17 In the antenna assembly provided in this embodiment, the coupling spacing of the first coupling slot is 0.8 mm, and the coupling area of ​​the first coupling slot is 6 mm². 2 The coupling spacing of the second coupling gap is 0.8 mm, and the coupling area of ​​the second coupling gap is 8.8 mm². 2 Structural diagram;

[0028] Figure 18 yes Figure 17 The provided antenna assembly's S11 parameters, radiation efficiency, and overall efficiency curves;

[0029] Figure 19 This is a schematic diagram of the SAR value distribution of the antenna assembly provided in this application embodiment at 1.8 GHz;

[0030] Figure 20 This is a schematic diagram of the SAR value distribution of a traditional bottom-mounted mid-to-high frequency antenna at 1.8 GHz;

[0031] Figure 21 This is a schematic diagram of the SAR value distribution of the antenna assembly provided in this application embodiment at 1.98 GHz;

[0032] Figure 22 This is a schematic diagram of the SAR value distribution of a traditional bottom-mounted mid-to-high frequency antenna at 1.98 GHz;

[0033] Figure 23 This is a schematic diagram of the SAR value distribution of the antenna assembly provided in this application embodiment at 2.35 GHz;

[0034] Figure 24 This is a schematic diagram of the SAR value distribution of a traditional bottom-mounted mid-to-high frequency antenna at 2.35 GHz;

[0035] Figure 25 This is a schematic diagram of the SAR value distribution of the antenna assembly provided in this application embodiment at 2.6 GHz;

[0036] Figure 26 This is a schematic diagram of the SAR value distribution of a traditional bottom-mounted mid-to-high frequency antenna at 2.6 GHz;

[0037] Figure 27 This is a schematic diagram of the antenna assembly provided in the embodiments of this application. Figure 3 ;

[0038] Figure 28 This is a schematic diagram of the antenna assembly provided in the embodiments of this application. Figure 4 ;

[0039] Figure 29 This is a schematic diagram of the antenna assembly provided in the embodiments of this application. Figure 5 ;

[0040] Figure 30 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Figure 2 . Detailed Implementation

[0041] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the embodiments described in this application are only a part of the embodiments, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without creative effort are within the protection scope of this application.

[0042] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0043] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, an assembly or device comprising one or more components is not limited to the one or more components listed, but may optionally also include one or more components not listed but inherent to the exemplified product, or one or more components that it should have based on the described function.

[0044] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device 1000 provided in an embodiment of this application. The electronic device 1000 includes, but is not limited to, devices with communication functions such as mobile phones, tablets, laptops, computers, wearable devices, drones, robots, and digital cameras. This embodiment uses a mobile phone as an example for illustration; other electronic devices can refer to this embodiment.

[0045] Please see Figure 2 , Figure 2 This is a partially exploded view of the electronic device 1000 provided in this application embodiment. Taking 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 mid-frame 300, and a back cover 400 arranged sequentially along its thickness direction. The mid-frame 300 includes a mid-plate 310 and a frame 320 surrounding the mid-plate 310. The frame 320 is a conductive frame, such as a metal frame. Receiving spaces are formed between the display screen 200 and the mid-plate 310, and between the mid-plate 310 and the back cover 400, to accommodate the motherboard 600, camera module, receiver module, battery 700, sub-board 800, and various sensors, etc. One side of the frame 320 along the thickness direction surrounds the edge of the display screen 200, and the other side of the frame 320 along the thickness direction surrounds the edge of the back cover 400, forming the complete external structure of the electronic device 1000. In this embodiment, the frame 320 and the middle plate 310 are an integral structure, while the frame 320 and the back cover 400 are separate structures. The above describes the working environment of the antenna assembly 100 using a mobile phone as an example, but the antenna assembly 100 of this application is not limited to the above working environment.

[0046] Please see Figure 3 , Figure 3 This is a partial rear view of the electronic device 1000 provided in this application embodiment without the back cover 400. The frame includes a top frame 321 and side frames that are connected to each other. The frame 320 also includes a bottom frame 324. The bottom frame 324 is disposed opposite to the top frame 321. The side frames include a first side frame 322 and a second side frame 323. Both the first side frame 322 and the second side frame 323 are connected between the top frame 321 and the bottom frame 324.

[0047] Optionally, the top border 321 is a straight border, and both the first side border 322 and the second side border 323 have straight borders in the middle and curved borders at both ends. The curvature angles of the curved borders at both ends of the first side border 322 are close to or equal to 90°. The curvature angles of the curved borders at both ends of the second side border 323 are also close to or equal to 90°. The curved borders are rounded. The bottom border 324 is a straight border.

[0048] The top border 321 is the side furthest from the ground when the user holds and uses the electronic device 1000 in portrait mode, and the bottom border 324 is the side facing the ground when the user holds and uses the electronic device 1000 in portrait mode. The first side border 322 is the left side when the user holds and uses the electronic device 1000 in portrait mode. The second side border 323 is the right side when the user holds and uses the electronic device 1000 in portrait mode. Of course, the first side border 322 can also be the right side when the user holds and uses the electronic device 1000, and the second side border 323 can be the left side when the user holds and uses the electronic device 1000.

[0049] Please see Figure 2 The electronic device 1000 also includes a reference ground system 500. The reference ground system 500 is located within the frame 320. The reference ground system 500 is generally rectangular in shape. Because various slots and holes are provided on the reference ground edge of the reference ground system 500 as needed to accommodate components or avoid other structures in the mobile phone, the reference ground system 500 includes, but is not limited to, the metal alloy portion of the middle plate 310 and the reference ground metal portion of the circuit board (including the main board 600 and the sub-board 800). In general, the reference ground system in the electronic device 1000 can be considered equivalent to a roughly rectangular shape, hence the name reference ground system 500. However, the reference ground system 500 does not imply that the reference ground is plate-shaped or a rectangular plate.

[0050] The specific structure of the antenna assembly 100 provided in Embodiment 1 will be illustrated below with reference to the accompanying drawings.

[0051] Please see Figure 3 and Figure 4The antenna assembly 100 includes a main radiator 10, a parasitic radiator 20, and a feed 30.

[0052] This application does not specifically limit the material of the main radiator 10. Optionally, the main radiator 10 may be made of a conductive material, including but not limited to conductive materials such as metals and alloys. This application does not specifically limit the shape of the main radiator 10. For example, the shape of the main radiator 10 may include, but is not limited to, strip-shaped, sheet-shaped, rod-shaped, coated, or thin-film-shaped. Figure 3 The main radiator 10 shown is merely an example and does not limit the shape of the main radiator 10 provided in this application. In this embodiment, the main radiator 10 is strip-shaped. This application does not limit the extension trajectory of the main radiator 10. Optionally, the main radiator 10 can extend along a straight line, a curve, or a bend. The main radiator 10 described above can be a line of uniform width on its extension trajectory, or it can be a strip of varying width, such as one with a gradually changing width or a widened region.

[0053] This application does not specifically limit the form of the main radiator 10. Optionally, the form of the main radiator 10 includes, but is not limited to, a metal frame, a metal frame embedded in a plastic frame, a metal radiator located within or on the surface of the frame 320, a flexible circuit board antenna formed on a flexible printed circuit board (FPC), a laser direct-formed antenna (LDS), a printed direct-formed antenna (PDS), a conductive sheet antenna (e.g., a metal bracket antenna), etc.

[0054] In this embodiment, the main radiator 10 is taken as part of the metal frame 320 of the electronic device 1000. The main radiator 10 and the parasitic radiator 20 can be disposed on the bottom frame 324. In other embodiments, the main radiator 10 and the parasitic radiator 20 can be disposed on the top frame 321, or the first side frame 322, or the second side frame 323.

[0055] Please see Figure 3 and Figure 4 The main radiator 10 includes a first free end E1, a feed point A1, and a first grounding point D1. Specifically, the first free end E1 and the first grounding point D1 are the two ends of the main radiator 10.

[0056] The free end mentioned in this application refers to the end that is disconnected from other conductive parts on the frame 320 through an insulating gap and is also disconnected from the reference ground system 500. To ensure the structural strength of the frame 320 of the electronic device 1000, the aforementioned insulating gap is filled with insulating material.

[0057] The grounding terminal described in this application is electrically connected to the reference ground system 500. The electrical connection method includes, but is not limited to, the grounding terminal returning to ground through a grounding spring; or, the grounding terminal and the reference ground system 500 are interconnected as one unit, that is, through a physical return to ground method.

[0058] The power supply point A1 is located between the first free end E1 and the first grounding point D1. This application does not limit the specific location of the power supply point A1. Optionally, the power supply point A1 may be a protrusion protruding towards the reference ground system 500 inside the frame 320.

[0059] The material, shape, and form of the parasitic radiator 20 can be referenced from the material, shape, and form of the main radiator 10.

[0060] Please see Figure 3 and Figure 4 A first coupling gap G1 is formed between the parasitic radiator 20 and the main radiator 10. In other words, the parasitic radiator 20 and the main radiator 10 are capacitively coupled.

[0061] This application does not specify the size of the first coupling gap G1. When both the main radiator 10 and the parasitic radiator 20 are part of the frame 320, the first coupling gap G1 is a slit opened on the frame 320. In addition, the first coupling gap G1 is filled with an insulating gap to ensure the structural strength of the frame 320.

[0062] It should be noted that "capacitive coupling" means that the first coupling gap G1 between the main radiator 10 and the parasitic radiator 20 generates an electric field, and the signal of the main radiator 10 can be transmitted to the parasitic radiator 20 through the electric field, and the signal of the parasitic radiator 20 can be transmitted to the main radiator 10 through the electric field, so that the main radiator 10 and the parasitic radiator 20 can conduct electrical signals even when they are not directly electrically connected.

[0063] Please see Figure 3 and Figure 4 The parasitic radiator 20 includes a first radiating segment 21 and a second radiating segment 22. A second coupling gap G2 is formed between the first radiating segment 21 and the second radiating segment 22. In other words, the first radiating segment 21 and the second radiating segment 22 are capacitively coupled.

[0064] Please see Figure 3 and Figure 4The first radiating segment 21 includes a second free end E2 and a third free end E3. Specifically, the second free end E2 and the third free end E3 are the two ends of the first radiating segment 21. A first coupling gap G1 is formed between the first free end E1 and the second free end E2.

[0065] Please see Figure 3 and Figure 4 The second radiating segment 22 includes a fourth free end E4 and a second grounding point D2. Specifically, the fourth free end E4 and the second grounding point D2 are the two ends of the second radiating segment 22. A second coupling gap G2 is formed between the fourth free end E4 and the third free end E3.

[0066] The first radiating segment 21 is equivalent to a suspended stub, and the arrangement of the first coupling slot G1 and the second coupling slot G2 makes the radiating stub of the antenna assembly 100 a double-slot radiating stub.

[0067] The feed source 30 includes, but is not limited to, radio frequency transceiver chips, radio frequency front-end circuits, etc. The feed source 30 is located on the motherboard 600.

[0068] The feed source 30 is electrically connected to the feed point A1. The electrical connection described in this application includes a direct electrical connection between two structures, or an indirect electrical connection via other components. In this embodiment, the feed source 30 and the feed point A1 are indirectly electrically connected via other electronic components, etc.

[0069] The feed source 30 is configured to provide radio frequency excitation current for the required frequency band (including subsequent first and third frequency bands). The radio frequency signal output port of the feed source 30 is a power supply port, which is, but is not limited to, an indirect electrical connection to a power supply point A1 on the frame 320 (e.g., a protrusion on the inner side of the frame 320) via soldering, coaxial cable, microstrip line, conductive spring, or conductive screw. In this embodiment, the feed source 30 is electrically connected to the power supply point A1 via a power supply spring (conductive spring) provided on the motherboard 600.

[0070] Please see Figure 5 The feed source 30 is used to excite the main radiator 10 to form a first current mode supporting the first frequency band. This application does not specifically limit the size of the first frequency band. For example, the first frequency band includes, but is not limited to, at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, GPS band, etc. For example, the first frequency band includes the B1 band.

[0071] Please see Figure 6The feed source 30 is also used to excite the parasitic radiator 20 to support a third current mode in the third frequency band. This application does not specifically limit the size of the third frequency band. For example, the third frequency band includes, but is not limited to, at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, GPS band, etc.

[0072] The first and third frequency bands are different frequency bands. For example, the first frequency band covers the B3 frequency band, and the third frequency band covers the B41 frequency band.

[0073] In this embodiment, by designing the main radiator 10 and the parasitic radiator 20 to be capacitively coupled through a first coupling gap G1, current modes (resonant modes) supporting different frequency bands are formed on the main radiator 10 and the parasitic radiator 20, respectively, increasing the number of frequency bands supported by the antenna assembly 100, thus facilitating the formation of a wider broadband antenna. By forming a second coupling gap G2 on the parasitic radiator 20 to form mutually coupled first radiating segments 21 and 22, the second coupling gap G2 enables the antenna assembly 100 to have better impedance tuning in the first and third frequency bands when forming current modes (resonant modes) in different frequency bands, and to have deeper S-parameter curves in the first and third frequency bands, thereby improving the efficiency of the first and third frequency bands.

[0074] The antenna assembly 100 provided in this application includes a main radiator 10, a parasitic radiator 20, and a feed 30. The main radiator 10 includes a first free end E1, a feed point A1, and a first ground point D1. The parasitic radiator 20 includes a first radiating segment 21 and a second radiating segment 22. The first radiating segment 21 includes a second free end E2 and a third free end E3, and a first coupling gap G1 is formed between the first free end E1 and the second free end E2. The second radiating segment 22 includes a fourth free end E4 and a second ground point D2. A second coupling gap G2 is formed between end E4 and the third free end E3; the feed source 30 is electrically connected to the feed point A1. The feed source 30 is used to excite the main radiator 10 to form a first current mode supporting the first frequency band. The feed source 30 is also used to excite the parasitic radiator 20 to support a third current mode supporting the third frequency band. In this way, the antenna assembly 100 can support the first frequency band and the third frequency band. By setting the second coupling gap G2 on the parasitic radiator 20, the radiator impedance of the antenna assembly 100 is improved, the resonance is made deeper, and the antenna efficiency is improved.

[0075] Please see Figure 3 and Figure 4The antenna assembly 100 includes a first matching circuit M1. The first matching circuit M1 is electrically connected between the feed 30 and the feed point A1. The first matching circuit M1 includes at least one of a capacitor and an inductor. The first matching circuit M1 adjusts the impedance matching between the feed 30 port (the aforementioned feed port) and the main radiator 10 port, thereby facilitating the feed 30 to excite at least a first current mode supporting the first frequency band on the main radiator 10.

[0076] Optionally, the distance between the feed point A1 and the first free end E1 is less than the distance between the feed point A1 and the first grounding point D1. Further, the feed point A1 is located on the main radiator 10 near the first free end E1.

[0077] In one optional implementation, the first current mode includes, but is not limited to, a left-handed composite mode. The component directly connected to the feed point A1 in the first matching circuit M1 is a capacitor with a small capacitance. The radio frequency excitation signal provided by the feed source 30 capacitively excites the feed point A1 and the first ground point D1 to form a first resonant mode supporting the first frequency band. The current mode formed by the first resonant current is the first current mode. The main current distribution of the first current mode is between the feed point A1 and the first ground point D1. The current intensity between the feed point A1 and the first ground point D1 is relatively uniform. The electrical length between the feed point A1 and the first ground point D1 is less than 1 / 4 wavelength of the center frequency of the first frequency band. That is, the electrical length between the feed point A1 and the first ground point D1 is less than the electrical length of the fundamental mode (1 / 4 wavelength mode) of the resonant mode.

[0078] Please see Figure 7 , Figure 7 This is a schematic diagram of the current distribution in the first current mode when the center frequency of the first frequency band is 1.8 GHz. The first current mode at 1.8 GHz is a left-handed composite mode, and the current is mainly distributed between the feed point A1 and the first ground point D1. Figure 7 The arrows in the diagram represent the current distribution, and the direction of the arrows indicates the current direction. The current intensity of the red arrow is greater than that of the yellow arrow, and the current intensity of the yellow arrow is greater than that of the green arrow.

[0079] In general technology, to form a ground state or higher-order mode resonant mode on the main radiator 10, the electrical length of the main radiator 10 needs to be greater than or equal to 1 / 4 wavelength of the supported frequency band.

[0080] In this embodiment, through the design of the feed 30, matching circuit, and main radiator 10 described above, the feed 30 can excite a first current mode on the main radiator 10. When the first current mode is a left-handed composite mode, the distance between the first feed point A1 and the first ground point D1 of the main radiator 10 can be less than 1 / 4 wavelength of the center frequency of the first frequency band. In this way, the length of the main radiator 10 can be shortened while supporting the first frequency band, thereby reducing the overall length of the antenna assembly 100 and the space occupied on the electronic device.

[0081] In other implementations, the first current mode may also be an IFA antenna mode, a T antenna mode, etc.

[0082] Please see Figure 8 The feed source 30 is also used to excite the main radiator 10 and the parasitic radiator 20 to form a second current mode supporting the second frequency band.

[0083] This application does not specifically limit the size of the second frequency band. For example, the second frequency band includes, but is not limited to, at least one of the following: LB band (less than 1 GHz), MHB band (1-3 GHz), UHB band (greater than 3 GHz), Wi-Fi band, GPS band, etc.

[0084] Optionally, the size of the second frequency band may differ from that of the first frequency band. For example, the first frequency band covers the B3 band, and the second frequency band covers the B40 band. Alternatively, the size of the second frequency band may differ from that of the third frequency band. For example, the first frequency band covers the B3 band, and the third frequency band covers the B41 band.

[0085] The antenna assembly 100 provided in this embodiment has a feed 30 that can support a first frequency band, a second frequency band, and a third frequency band. Since the parasitic radiator 20 forms a first radiating segment 21 and a second radiating segment 22 through the second coupling gap G2, the resonant impedance of the first frequency band, the second frequency band, and the third frequency band can be changed by tuning the first coupling gap G1 and the second coupling gap G2, so as to form a broadband antenna that can support multiple frequency bands and improve the efficiency of the broadband antenna.

[0086] In one alternative implementation, the second current mode includes a ring mode. The main current distribution of the second current mode is between the first ground point D1 and the second ground point D2.

[0087] The second current mode has the same current direction between the second ground point D2 and the first ground point D1. For example, if the current direction is from the second ground point D2 to the first ground point D1, the current in the second current mode on the reference ground flows from the first ground point D1 to the second ground point D2. The current intensity of the second current mode generally shows a trend of being strong at both ends (first ground point D1 and second ground point D2) and weak in the middle, and the electrical length of the second current mode between the second ground point D2 and the first ground point D1 is close to half the wavelength of the center frequency of the second frequency band. Therefore, the second current mode is similar to the loop current mode of the second frequency band.

[0088] Specifically, the current intensity from the second grounding point D2 to the second coupling gap G2 gradually decreases, the current flowing from the second coupling gap G2 to the first coupling gap G1 first increases and then decreases, and the current intensity from the first coupling gap G1 to the first grounding point D1 gradually increases.

[0089] Please see Figure 9 , Figure 9 This is a schematic diagram of the current distribution in the second current mode at a center frequency of 2.5 GHz in the second frequency band. The second current mode at 2.5 GHz is similar to a 1 / 2λ ring mode. Figure 9 The arrows in the diagram represent the current distribution, and the direction of the arrows indicates the current direction. The current intensity of the red arrow is greater than that of the yellow arrow, and the current intensity of the yellow arrow is greater than that of the green arrow.

[0090] It should be noted that the resonant current is alternating current, and the direction of the first current mode will periodically reverse.

[0091] In other alternative implementations, the second current mode includes, but is not limited to, an L-type parasitic mode.

[0092] In this embodiment, by designing the lengths of the main radiator 10 and the parasitic radiator 20, the coupling amount between the main radiator 10 and the parasitic radiator 20, and the coupling between the first radiating segment 21 and the second radiating segment 22, a first current mode supporting the first frequency band and a second current mode supporting the second frequency band can be formed on the main radiator 10 and the parasitic radiator 20. In addition, the second coupling gap G2 is located on the current path of the second current mode, which can tune the current distribution of the second current mode and facilitate the tuning of the impedance of the first and second frequency bands, thereby deepening the resonance depth in the S-parameter curves of the first and second frequency bands and improving the radiation efficiency of the first and second frequency bands. It also helps to reduce the concentration of current intensity on the parasitic radiator 20, thereby reducing the specific absorption rate (SAR) of the antenna assembly 100.

[0093] The antenna assembly 100 provided in this embodiment has a feed 30 that can support a first frequency band, a second frequency band, and a third frequency band. Since the parasitic radiator 20 forms a first radiating segment 21 and a second radiating segment 22 through the second coupling gap G2, the resonant impedance of the first frequency band, the second frequency band, and the third frequency band can be changed by tuning the first coupling gap G1 and the second coupling gap G2, so as to form a broadband antenna that can support multiple frequency bands and improve the efficiency of the broadband antenna.

[0094] Optionally, the main current of the third current mode is distributed between the second free end E2 and the second grounding point D2, that is, distributed on the parasitic stub. The current intensity at the second grounding point D2 is greater than the current intensity at the second free end E2.

[0095] In one alternative implementation, the third current mode is similar to a 1 / 4 wavelength parasitic mode. The current intensity of the third current mode is stronger at one end and weaker at the other. For example, taking a current direction from the second grounding point D2 to the second free end E2 as an example, the current intensity from the second grounding point D2 to the second coupling gap G2 gradually decreases, while the current flowing from the second coupling gap G2 to the first coupling gap G1 first increases and then decreases. The electrical length between the second grounding point D2 and the second free end E2 is close to 1 / 4 wavelength of the center frequency of the third frequency band.

[0096] Please see Figure 10 , Figure 10 This is a schematic diagram of the current distribution in the third current mode at a center frequency of 2.75 GHz in the third frequency band. The third current mode at 2.75 GHz is a parasitic mode. Figure 10 The arrows in the diagram represent the current distribution, and the direction of the arrows indicates the current direction. The current intensity of the red arrow is greater than that of the yellow arrow, and the current intensity of the yellow arrow is greater than that of the green arrow.

[0097] In this embodiment, by designing the lengths of the main radiator 10 and the parasitic radiator 20, the coupling amount between the main radiator 10 and the parasitic radiator 20, and the coupling between the first radiating segment 21 and the second radiating segment 22, it is possible to form a first current mode supporting the first frequency band, a second current mode supporting the second frequency band, and a third current mode supporting the third frequency band on the main radiator 10 and the parasitic radiator 20. In addition, the second coupling gap G2 is located on the current path of the second current mode and the third current mode, which can tune the current distribution of the second current mode and the third current mode, and facilitate the tuning of the impedance of the first frequency band, the second frequency band, and the third frequency band, thereby deepening the resonance depth in the S-parameter curves of the first frequency band, the second frequency band, and the third frequency band, and thus improving the radiation efficiency of the first frequency band, the second frequency band, and the third frequency band; it also helps to reduce the current intensity concentration on the parasitic radiator 20, thereby reducing the electromagnetic wave ratio (SAR) value of the antenna assembly 100.

[0098] As can be seen from the above, the second current mode and the third current mode can be the dual-wave mode excited by the feed 30 on the parasitic radiator 20.

[0099] In one alternative implementation, please refer to Figure 11 The center frequency of the first frequency band F1 is lower than the center frequency of the second frequency band F2. The center frequency of the second frequency band F2 is lower than the center frequency of the third frequency band F3. In other words, the center frequencies of the first frequency band F1, the second frequency band F2, and the third frequency band F3 are arranged in ascending order.

[0100] For example, the first frequency band F1 is a sub-band of the LB frequency band, and the second frequency band F2 and the third frequency band F3 are sub-bands of the MHB frequency band. As another example, the first frequency band F1, the second frequency band F2, and the third frequency band F3 are all sub-bands of the MHB frequency band.

[0101] In this embodiment, the first frequency band F1, the second frequency band F2, and the third frequency band F3 can cover the entire MHB frequency band to form a support for the entire MHB frequency band. Thus, the antenna assembly 100 can change the resonant impedance of the entire MHB frequency band by tuning the coupling amount of the first coupling gap G1 and the second coupling gap G2, thereby forming a broadband antenna that can support the entire MHB frequency band and improving the efficiency of the broadband antenna.

[0102] Further, please refer to Figure 11The first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0. On one hand, by designing the resonant frequencies of the first to third current modes on the main radiator 10 and the parasitic radiator 20, the frequency interval between the center frequencies of the first frequency band F1, the second frequency band F2, and the third frequency band F3 is less than or equal to a preset frequency band (the preset frequency band includes, but is not limited to, 0.8 GHz), thus forming a continuous frequency band F0. On the other hand, by designing the coupling amount of the first coupling slot G1 and the coupling amount of the second coupling slot G2, the resonance depth of the S-parameter curves of the first frequency band F1, the second frequency band F2, and the third frequency band F3 is increased, thereby forming a continuous frequency band F0, thus creating an antenna that covers the entire MHB frequency band and improves the efficiency of the entire MHB frequency band.

[0103] Optionally, the continuous frequency band F0 covers at least one of the frequency bands B3, B1, B40, and B41. Further, the continuous frequency band F0 can continuously cover the frequency bands B3, B1, B40, and B41 to support the B3+B1+B40+B41 frequency band.

[0104] In this embodiment, by tuning the coupling amount of the first coupling slot G1 and the coupling amount of the second coupling slot G2, the continuous frequency band F0 covers 1.7GHz to 2.9GHz, thereby enabling the antenna assembly 100 to simultaneously cover the B3, B1, B40, and B41 frequency bands to support the B3+B1+B40+B41 frequency bands.

[0105] Optionally, a first coupling amount exists between the first free end E1 and the second free end E2. A second coupling amount exists between the third free end E3 and the fourth free end E4. The second coupling amount is greater than the first coupling amount. In other words, the coupling amount between the first radiating segment 21 and the second radiating segment 22 is greater than the coupling amount between the main radiator 10 and the parasitic radiator 20, so as to guide more current distribution on the parasitic radiator 20, tune the current distribution on the main radiator 10 and the parasitic radiator 20, thereby improving the impedance of the first frequency band F1, the second frequency band F2 and the third frequency band F3, making the resonance of the S11 parameter deeper, and thus improving the antenna efficiency.

[0106] Optionally, the coupling amount of the coupling gap is mainly related to the coupling area and the coupling spacing. The larger the coupling area and the smaller the coupling spacing, the greater the coupling amount.

[0107] For example, please see Figure 12The coupling areas of the first coupling gap G1 and the second coupling gap G2 are the same. The coupling distance h1 of the first coupling gap G1 is greater than the coupling distance h2 of the second coupling gap G2, so that the second coupling amount of the second coupling gap G2 is greater than the first coupling amount of the first coupling gap G1.

[0108] For another example, the coupling spacing h1 of the first coupling gap G1 is the same as the coupling spacing h2 of the second coupling gap G2. The coupling area of ​​the second coupling gap G2 is greater than the coupling area of ​​the first coupling gap G1, so that the second coupling amount of the second coupling gap G2 is greater than the first coupling amount of the first coupling gap G1.

[0109] For another example, the coupling distance h1 of the first coupling gap G1 is greater than the coupling distance h2 of the second coupling gap G2, and the coupling area of ​​the second coupling gap G2 is greater than the coupling area of ​​the first coupling gap G1, so that the second coupling amount of the second coupling gap G2 is greater than the first coupling amount of the first coupling gap G1.

[0110] For another example, the coupling distance h1 of the first coupling gap G1 is less than the coupling distance h2 of the second coupling gap G2, and the coupling area of ​​the second coupling gap G2 is greater than the coupling area of ​​the first coupling gap G1, so that the second coupling amount of the second coupling gap G2 is greater than the first coupling amount of the first coupling gap G1.

[0111] For another example, the coupling distance h1 of the first coupling gap G1 is greater than the coupling distance h2 of the second coupling gap G2, and the coupling area of ​​the second coupling gap G2 is smaller than the coupling area of ​​the first coupling gap G1, so that the second coupling amount of the second coupling gap G2 is greater than the first coupling amount of the first coupling gap G1.

[0112] This application research found that when the second coupling amount is less than the first coupling amount, the efficiency of the second frequency band F2 and the third frequency band F3 is reduced. Therefore, by designing the second coupling amount to be greater than the first coupling amount, the efficiency of the second frequency band F2 and the third frequency band F3 can be ensured.

[0113] The following example illustrates the effect of the change in the coupling spacing h1 (spacing) of the first coupling gap G1 on efficiency.

[0114] In one optional embodiment, the coupling spacing h1 of the first coupling gap G1 is less than or equal to 1 mm. The coupling spacing h1 of the first coupling gap G1 is greater than or equal to a first preset spacing. When the first preset spacing is, the center frequency of the third frequency band F3 is greater than or equal to 2650 MHz.

[0115] As the coupling spacing h1 of the first coupling gap G1 decreases, the coupling spacing between the main radiator 10 and the parasitic radiator 20 decreases, and the first coupling amount between the main radiator 10 and the parasitic radiator 20 increases. This facilitates the formation of a second current mode supporting the second frequency band F2 on the main radiator 10 and the parasitic radiator 20, and the formation of a third current mode supporting the third frequency band F3 on the parasitic radiator 20.

[0116] In their research, the technicians of this application discovered that as the first coupling amount between the main radiator 10 and the parasitic radiator 20 increases, the coupling current intensity on the parasitic radiator 20 increases, and the center frequency points of the first frequency band F1, the second frequency band F2, and the third frequency band F3 gradually move towards the lower frequency direction, that is, the entire continuous frequency band F0 moves towards the lower frequency side. This embodiment sets the coupling spacing h1 of the first coupling gap G1 to be greater than or equal to the first preset spacing to avoid the continuous frequency band F0 failing to cover the target frequency band to be covered, such as the B41 frequency band. The B41 frequency band ranges from 2496 to 2690 MHz. Therefore, when designing the coupling spacing h1 of the first coupling gap G1, the center frequency of the third frequency band F3 corresponding to the minimum width of the first coupling gap G1 (i.e., the first preset spacing) is greater than or equal to 2650MHz, so as to ensure that the third frequency band F3 can completely cover the B41 frequency band, that is, the frequency band supported by the antenna assembly 100 can completely cover the B41 frequency band, and ensure the efficiency of the end channel of the B41 frequency band.

[0117] In this embodiment, the reason why the entire continuous frequency band F0 shifts towards the low-frequency side includes: the first coupling gap G1 is equivalent to the series capacitance between the main radiator 10 and the parasitic radiator 20. When the first coupling amount increases, the capacitance value of the equivalent series capacitance between the main radiator 10 and the parasitic radiator 20 increases, the equivalent electrical length of the main radiator 10 and the parasitic radiator 20 increases, and the resonant frequency points on the main radiator 10 and the parasitic radiator 20 shift towards the low-frequency side.

[0118] In one alternative implementation, please refer to Figure 12 The coupling spacing h2 of the second coupling gap G2 is less than or equal to 1 mm. The coupling spacing h2 of the second coupling gap G2 is greater than or equal to a second preset spacing. The center frequency of the third frequency band F3 is greater than or equal to 2650 MHz when the second preset spacing is used.

[0119] As the coupling spacing h2 of the second coupling gap G2 decreases, the coupling spacing between the first radiation segment 21 and the second radiation segment 22 decreases, and the second coupling amount between the first radiation segment 21 and the second radiation segment 22 increases. This facilitates the formation of a second current mode supporting the second frequency band F2 on the first radiation segment 21 and the second radiation segment 22, and the formation of a third current mode supporting the third frequency band F3 on the parasitic radiator 20.

[0120] In their research, the technicians of this application discovered that as the second coupling amount between the first radiating segment 21 and the second radiating segment 22 increases, the coupling current intensity on the parasitic radiator 20 increases, and the center frequency points of the first frequency band F1, the second frequency band F2, and the third frequency band F3 gradually move towards the lower frequency direction, that is, the entire continuous frequency band F0 moves towards the lower frequency side. This embodiment sets the coupling spacing h2 of the second coupling gap G2 to be greater than or equal to the second preset spacing to avoid the continuous frequency band F0 failing to cover the target frequency band to be covered, such as the B41 frequency band. The B41 frequency band ranges from 2496 to 2690 MHz. Therefore, when designing the coupling spacing h2 of the second coupling gap G2, the center frequency of the third frequency band F3 corresponding to the minimum width of the second coupling gap G2 (i.e., the second preset spacing) is greater than or equal to 2650MHz, so as to ensure that the third frequency band F3 can completely cover the B41 frequency band, that is, the frequency band supported by the antenna assembly 100 can completely cover the B41 frequency band, and ensure the efficiency of the end channel of the B41 frequency band.

[0121] In this embodiment, the reason why the entire continuous frequency band F0 shifts towards the low-frequency side includes: the second coupling gap G2 is equivalent to the series capacitance between the first radiating segment 21 and the second radiating segment 22. When the second coupling amount increases, the capacitance value of the equivalent series capacitance between the first radiating segment 21 and the second radiating segment 22 increases, the equivalent electrical length of the first radiating segment 21 and the second radiating segment 22 increases, and the resonant frequency point on the first radiating segment 21 and the second radiating segment 22 shifts towards the low-frequency side.

[0122] In one alternative implementation, please refer to Figure 12 The coupling spacing h1 of the first coupling gap G1 is less than or equal to 1 mm. The coupling spacing h1 of the first coupling gap G1 is greater than or equal to a first preset spacing. At the first preset spacing, the center frequency of the third frequency band F3 is greater than or equal to 2650 MHz. The coupling spacing h2 of the second coupling gap G2 is less than or equal to 1 mm. The coupling spacing h2 of the second coupling gap G2 is greater than or equal to a second preset spacing. At the second preset spacing, the center frequency of the third frequency band F3 is greater than or equal to 2650 MHz.

[0123] Specifically, the S11 parameters and efficiency of three sets of comparative embodiments with coupling spacing h2 of 0.5mm, 0.8mm and 1mm for the first coupling gap G1 and the second coupling gap G2, respectively, are compared.

[0124] Please see Figure 11 , Figure 11The figures show the S11 parameter curves for three sets of comparative embodiments where the coupling spacing h2 of the first coupling gap G1 and the second coupling gap G2 are 0.5 mm, 0.8 mm, and 1 mm, respectively. Notably, the coupling areas of the first coupling gap G1 and the second coupling gap G2 are the same for different gap widths.

[0125] Curve a represents the S11 parameter curve when the coupling spacing h1 of the first coupling slot G1 is 0.5 mm and the coupling spacing h2 of the second coupling slot G2 is 0.5 mm. It can be seen that from low frequency to high frequency, the antenna assembly 100 sequentially generates three resonances (concave curves). The resonance point of the first resonance is the center frequency of the first frequency band F1, which is close to 1.77 GHz in curve a; the resonance point of the second resonance is the center frequency of the second frequency band F2, which is close to 2.45 GHz in curve a; and the resonance point of the third resonance is the center frequency of the third frequency band F3, which is close to 2.73 GHz in curve a. From curve a, it can be seen that the first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0, which can cover 1.6 GHz to 2.8 GHz, and thus can fully cover the B3+B1+B40+B41 frequency bands, etc.

[0126] Curve b represents the S11 parameter curve when the coupling spacing h1 of the first coupling slot G1 is 0.8 mm and the coupling spacing h2 of the second coupling slot G2 is 0.8 mm. It can be seen that from low frequency to high frequency, the antenna assembly 100 sequentially generates three resonances (concave curves). The resonance point of the first resonance is the center frequency of the first frequency band F1, which is close to 1.8 GHz in curve b; the resonance point of the second resonance is the center frequency of the second frequency band F2, which is close to 2.46 GHz in curve b; and the resonance point of the third resonance is the center frequency of the third frequency band F3, which is close to 2.75 GHz in curve b. From curve b, it can be seen that the first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0, which can cover 1.7 GHz to 3 GHz, and thus can fully cover the B3+B1+B40+B41 frequency bands, etc.

[0127] Curve c represents the S11 parameter curve when the coupling spacing h1 of the first coupling slot G1 is 1 mm and the coupling spacing h2 of the second coupling slot G2 is 1 mm. It can be seen that from low frequency to high frequency, the antenna assembly 100 sequentially generates three resonances (concave curves). The resonance point of the first resonance is the center frequency of the first frequency band F1, which is close to 1.9 GHz in curve c; the resonance point of the second resonance is the center frequency of the second frequency band F2, which is close to 2.47 GHz in curve c; and the resonance point of the third resonance is the center frequency of the third frequency band F3, which is close to 2.9 GHz in curve c. From curve c, it can be seen that the first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0, which can cover 1.7 GHz to 3.2 GHz, and thus can fully cover the B3+B1+B40+B41 frequency bands, etc.

[0128] Comparing curves c, b, and a, it can be seen that as the coupling spacing h1 of the first coupling gap G1 and h2 of the second coupling gap G2 gradually decrease, the center frequencies of the first frequency band F1, the second frequency band F2, and the third frequency band F3 shift towards the lower frequency side, and the continuous frequency band F0 also shifts towards the lower frequency side. Furthermore, it can be observed that as the coupling spacing h1 of the first coupling gap G1 and h2 of the second coupling gap G2 gradually decrease, the resonance of the S11 curve in the first frequency band F1, the second frequency band F2, and the third frequency band F3 becomes deeper.

[0129] Please see Figure 13 , Figure 13 The figures show efficiency curves for three comparative embodiments where the coupling spacing h2 of the first coupling gap G1 and the second coupling gap G2 are 0.5 mm, 0.8 mm, and 1 mm, respectively. Notably, the coupling areas of the first coupling gap G1 and the second coupling gap G2 are the same for different gap widths.

[0130] Curve a represents the efficiency curve when the coupling spacing h1 of the first coupling gap G1 is 0.5 mm and the coupling spacing h2 of the second coupling gap G2 is 0.5 mm. Curve b represents the efficiency curve when the coupling spacing h1 of the first coupling gap G1 is 0.8 mm and the coupling spacing h2 of the second coupling gap G2 is 0.8 mm. Curve c represents the efficiency curve when the coupling spacing h1 of the first coupling gap G1 is 1 mm and the coupling spacing h2 of the second coupling gap G2 is 1 mm. Comparing curves c, b, and a, it can be seen that as the coupling spacing h1 of the first coupling gap G1 and the coupling spacing h2 of the second coupling gap G2 gradually decrease, the system efficiency curve shifts towards the low-frequency side.

[0131] Furthermore, it can be seen that the efficiency corresponding to the first resonance on curve a is greater than that corresponding to the first resonance on curve b; the efficiency corresponding to the first resonance on curve b is greater than that corresponding to the first resonance on curve c. The efficiency corresponding to the second resonance on curve a is greater than that corresponding to the second resonance on curve b; the efficiency corresponding to the second resonance on curve b is greater than that corresponding to the second resonance on curve c. The efficiency corresponding to the third resonance on curve a is greater than that corresponding to the third resonance on curve b; the efficiency corresponding to the third resonance on curve b is greater than that corresponding to the third resonance on curve c. This indicates that as the coupling spacing h1 of the first coupling gap G1 and the coupling spacing h2 of the second coupling gap G2 gradually decrease, the gap coupling gradually increases, and the resonances in the first frequency band F1, the second frequency band F2, and the third frequency band F3 of the S11 curve gradually deepen. Therefore, the efficiency of the system efficiency curve in the first frequency band F1, the second frequency band F2, and the third frequency band F3 gradually increases.

[0132] As can be seen from the efficiency curve, the efficiency drop-off edge when the coupling spacing h1 of the first coupling gap G1 is 1 mm and the coupling spacing h2 of the second coupling gap G2 is 1 mm is shifted forward by a relatively large amount compared to the efficiency drop-off edge when the coupling spacing h1 of the first coupling gap G1 is 0.8 mm and the coupling spacing h2 of the second coupling gap G2 is 0.8 mm. This is because after the coupling amount of the first coupling gap G1 and the second coupling gap G2 increases, it is equivalent to an increase in the equivalent electrical length of the parasitic radiator 20 and the main radiator 10, so it moves towards the low-frequency side. If the shift of the efficiency degradation edge toward the low-frequency side is large, it will affect the efficiency of the B41 end channel. Therefore, in this embodiment, the coupling spacing h1 of the first coupling gap G1 is greater than or equal to the first preset spacing, the coupling spacing h2 of the second coupling gap G2 is greater than or equal to the second preset spacing, and the center frequency of the third frequency band F3 is greater than or equal to 2650MHz, so as to ensure that the third frequency band F3 can completely cover the B41 frequency band, thereby increasing the efficiency of the antenna assembly 100 in the first frequency band F1, the second frequency band F2 and the third frequency band F3 while ensuring the efficiency of the B41 end channel.

[0133] Please refer to Table 1, which compares the average efficiency of three sets of comparative embodiments with coupling distances h2 of 0.5mm, 0.8mm, and 1mm for the first coupling slot G1 and the second coupling slot G2, respectively. The coupling areas of the first coupling slot G1 and the second coupling slot G2 are the same for different slot widths. The continuous frequency band F0 covers the B3, B1, B40, and B41 bands. The average efficiency of the B3, B1, B40, and B41 bands under different slot widths is calculated as shown in the table below. It can be seen that as the slot width decreases, the S11 resonance of the B3 band deepens, and the antenna efficiency of the B3 band increases. For example, when the coupling distance h2 of both the first coupling slot G1 and the second coupling slot G2 is 0.5mm, the efficiency of B3 increases to -2.9dB, which is much higher than -4.5dB. As the slot width decreases, the S11 resonance in the B1 band deepens, resulting in higher antenna efficiency in the B1 band. For example, when the coupling spacing h2 of both the first coupling slot G1 and the second coupling slot G2 is 0.5 mm, the efficiency of B1 increases to -3.2 dB, significantly higher than -4.5 dB. Similarly, as the slot width decreases, the S11 resonance in the B40 band deepens, leading to higher antenna efficiency in the B40 band. For example, when the coupling spacing h2 of both the first coupling slot G1 and the second coupling slot G2 is 0.5 mm, the efficiency of B40 increases to -3.1 dB, significantly higher than -4.5 dB. Likewise, as the slot width decreases, the S11 resonance in the B41 band deepens, leading to higher antenna efficiency in the B41 band. For example, when the coupling spacing h2 of both the first coupling slot G1 and the second coupling slot G2 is 0.5 mm, the efficiency of B41 increases to -2.4 dB, significantly higher than -4.5 dB.

[0134] Table 1

[0135]

[0136] In this embodiment, the coupling distance h2 of both the first coupling gap G1 and the second coupling gap G2 is less than or equal to 1 mm. Furthermore, the coupling distance h1 of the first coupling gap G1 is designed to be greater than or equal to a first preset distance, and the coupling distance h2 of the second coupling gap G2 is designed to be greater than or equal to a second preset distance. In their research, those skilled in the art discovered that as the coupling distance h1 of the first coupling gap G1 and the coupling distance h2 of the second coupling gap G2 decrease, the impedance of the main radiator 10 and the parasitic radiator 20 can be improved, resulting in better matching impedance on the curve in the Smith chart. This deepens the resonance in the S11 curve, thereby improving the resonance efficiency on the main radiator 10 and the parasitic radiator 20. In addition, it ensures that the falling edge of the efficiency curve is after the B41 frequency band, thus guaranteeing the efficiency of the unchanneled B41 frequency band.

[0137] Optionally, the coupling spacing h1 of the first coupling gap G1 is greater than or equal to 0.5 mm. For example, the coupling spacing h1 of the first coupling gap G1 includes, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc., and the coupling spacing h1 of the first coupling gap G1 can also be any value between 0.5 mm and 1 mm.

[0138] In this embodiment, the range of the second coupling gap G2 is not specifically limited. The second coupling gap G2 is less than or equal to 1 mm and greater than or equal to the second preset spacing.

[0139] When the coupling spacing h1 of the first coupling slot G1 is less than or equal to 1 mm, the coupling amount of the first coupling slot G1 is relatively large, which has a certain effect on improving the impedance of the main radiator 10 and the parasitic radiator 20, deepening each resonance in the S11 curve, and improving the efficiency of the antenna assembly 100 in the MHB band. When both the main radiator 10 and the parasitic radiator 20 are part of the frame, the first coupling slot G1 is made by cutting a slot in the metal frame with a cutting tool. If the coupling spacing h1 of the first coupling slot G1 is too small, for example, less than 0.5 mm, it will be more difficult in actual processing. For example, it is necessary to use a cutting tool with a thickness of less than 0.5 mm and a vibration amplitude of less than 0.5 mm during rotation to process the first coupling slot G1, which increases the processing cost. On the other hand, error detection and error control during processing are more difficult. In this embodiment, by designing the coupling spacing h1 of the first coupling gap G1 to be greater than or equal to 0.5mm, the efficiency of the antenna assembly 100 is improved, while avoiding the problems of excessive processing difficulty, difficulty in controlling processing errors, difficulty in error detection, and high cost caused by the coupling spacing h1 of the first coupling gap G1.

[0140] Optional, please refer to Figure 12 The coupling spacing h2 of the second coupling gap G2 is greater than or equal to 0.5 mm. For example, the coupling spacing h2 of the second coupling gap G2 may include, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc., and the coupling spacing h2 of the second coupling gap G2 may also be any value between 0.5 mm and 1 mm.

[0141] In this embodiment, the range of the first coupling gap G1 is not specifically limited. The first coupling gap G1 is less than or equal to 1 mm and greater than or equal to the first preset spacing.

[0142] When the coupling spacing h2 of the second coupling slot G2 is less than or equal to 1 mm, the coupling amount of the second coupling slot G2 is relatively large, which has a certain effect on improving the impedance of the main radiator 10 and the parasitic radiator 20, deepening each resonance in the S11 curve, and improving the efficiency of the antenna assembly 100 in the MHB band. When both the main radiator 10 and the parasitic radiator 20 are part of the frame, the second coupling slot G2 is made by cutting a slot in the metal frame using a cutting tool. If the coupling spacing h2 of the second coupling slot G2 is too small, for example, less than 0.5 mm, it will be more difficult in actual processing. For example, it will require a cutting tool with a thickness of less than 0.5 mm and a vibration amplitude of less than 0.5 mm during rotation to process the second coupling slot G2, which will increase the processing cost. On the other hand, error detection and error control during processing will be more difficult. In this embodiment, by designing the coupling spacing h2 of the second coupling gap G2 to be greater than or equal to 0.5mm, the efficiency of the antenna assembly 100 is improved, while avoiding the problems of excessive processing difficulty, difficulty in controlling processing errors, difficulty in error detection, and high cost caused by the coupling spacing h2 of the second coupling gap G2.

[0143] Optional, please refer to Figure 12 The coupling spacing h1 of the first coupling gap G1 is greater than or equal to 0.5 mm, and the coupling spacing h2 of the second coupling gap G2 is greater than or equal to 0.5 mm. In other words, the coupling spacing h1 of the first coupling gap G1 is 1 to 0.5 mm, and the coupling spacing h2 of the second coupling gap G2 is 1 to 0.5 mm. For example, the coupling spacing h1 of the first coupling gap G1 may include, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc., and may also be any value between 0.5 mm and 1 mm. Similarly, the coupling spacing h2 of the second coupling gap G2 may include, but is not limited to, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc., and may also be any value between 0.5 mm and 1 mm.

[0144] When the coupling spacing h1 of the first coupling slot G1 is less than or equal to 1 mm and the coupling spacing h2 of the second coupling slot G2 is less than or equal to 1 mm, the coupling amount of the first coupling slot G1 and the second coupling slot G2 is relatively large, which has a certain effect on improving the impedance of the main radiator 10 and the parasitic radiator 20, deepening each resonance in the S11 curve, and improving the efficiency of the antenna assembly 100 in the MHB band. Considering the problems of excessive processing difficulty, difficulty in controlling processing errors, difficulty in error detection, and high cost caused by excessively small coupling spacing of the coupling slots, this embodiment designs the coupling spacing h1 of the first coupling slot G1 to be greater than or equal to 0.5 mm and the coupling spacing h2 of the second coupling slot G2 to be greater than or equal to 0.5 mm. This improves the efficiency of the antenna assembly 100 while avoiding the problems of excessive processing difficulty, difficulty in controlling processing errors, difficulty in error detection, and high cost caused by excessive coupling spacing of the coupling slots.

[0145] Optional, please refer to Figure 14 The coupling spacing h1 of the first coupling gap G1 is 0.7–0.9 mm; and / or the width of the second coupling gap G2 is 0.7–0.9 mm. For example, the coupling spacing h1 of the first coupling gap G1 is 0.7–0.9 mm, and the width of the second coupling gap G2 is 0.5–1 mm. For example, the coupling spacing h1 of the first coupling gap G1 is 0.5–1 mm, and the width of the second coupling gap G2 is 0.7–0.9 mm. For example, the coupling spacing h1 of the first coupling gap G1 is 0.7–0.9 mm, and the width of the second coupling gap G2 is 0.7–0.9 mm.

[0146] As the coupling spacing h1 of the first coupling slot G1 decreases and the coupling spacing h2 of the second coupling slot G2 decreases, the coupling amount of the first coupling slot G1 and the second coupling slot G2 increases, which has a certain effect on improving the impedance of the main radiator 10 and the parasitic radiator 20. It deepens each resonance in the S11 curve and can improve the efficiency of the antenna assembly 100. However, if the coupling spacing h1 of the first coupling slot G1 and the coupling spacing h2 of the second coupling slot G2 are too small, it may lead to problems such as excessive processing difficulty, difficulty in controlling processing errors, difficulty in error detection, and high cost of the first coupling slot G1 and the second coupling slot G2. Based on this, this embodiment designs the coupling spacing h1 of the first coupling slot G1 to be 0.7~0.9mm and / or the width of the second coupling slot G2 to be 0.7~0.9mm. This can not only improve the efficiency of the antenna assembly 100, but also avoid the problems of excessive processing difficulty, difficulty in controlling processing errors, difficulty in error detection, and high cost caused by the coupling spacing of the coupling slots.

[0147] For example, when the coupling spacing h1 of the first coupling slot G1 and the coupling spacing h2 of the second coupling slot G2 are both 0.8mm, the efficiency of the antenna assembly 100 in the B3, B1, B40, and B41 frequency bands are -3.6dB, -3.7dB, -3.6dB, and -2.8dB, respectively, all greater than the conventional efficiency of -4.5dB. This improves the efficiency of the antenna assembly 100 while avoiding the problems of excessive processing difficulty, uncontrollable processing errors, difficult error detection, and high cost caused by the coupling spacing of the coupling slots.

[0148] In one alternative implementation, please refer to Figure 14 The coupling spacing h1 of the first coupling gap G1 is the same as the coupling spacing h2 of the second coupling gap G2. Thus, the first coupling gap G1 and the second coupling gap G2 can be formed using the same machining tool and machining process, thereby reducing machining costs and simplifying machining processes.

[0149] Of course, in other embodiments, the coupling spacing h1 of the first coupling gap G1 can be smaller than the coupling spacing h2 of the second coupling gap G2, which is beneficial for the second coupling amount to be greater than the first coupling amount.

[0150] Optionally, the first coupling gap G1 has a first coupling area. The first coupling area is the area directly opposite each other between the first free end E1 and the second free end E2. The second coupling gap G2 has a second coupling area. The second coupling area is the area directly opposite each other between the third free end E3 and the fourth free end E4. The second coupling area is greater than or equal to the first coupling area.

[0151] This application research found that when the second coupling amount is less than the first coupling amount, the efficiency of the B40 and B41 frequency bands is reduced. Therefore, by designing the second coupling area to be greater than or equal to the first coupling area, it is beneficial to ensure that the second coupling amount is greater than the first coupling amount, thereby ensuring the efficiency of the B40 and B41 frequency bands.

[0152] The following example illustrates the impact of changes in the coupling area of ​​the first coupling gap G1 and the second coupling gap G2 on efficiency.

[0153] Specifically, the coupling area of ​​the first coupling gap G1 is 4 mm. 2 4.7mm 2 The parameters and efficiency of S11 in the comparative embodiment are compared. The coupling spacing h1 of the first coupling gap G1 and the coupling spacing h2 of the second coupling gap G2 are both 0.8 mm. The coupling area of ​​the second coupling gap G2 is 5 mm². 2 .

[0154] Please see Figure 15 , Figure 15The coupling area of ​​the first coupling gap G1 is 4 mm. 2 4.7mm 2 The S11 parameters, radiation efficiency, and overall efficiency curves of the comparative embodiment are shown.

[0155] Please see Figure 15 Curve a represents the coupling area of ​​the first coupling gap G1, which is 4 mm². 2 The S11 parameter curves are shown for the first coupling slot G1 when the coupling distance h1 is 0.8 mm. It can be seen that from low frequency to high frequency, the antenna assembly 100 sequentially generates three resonances (concave curves). The resonance point of the first resonance is the center frequency of the first frequency band F1, which is close to 1.8 GHz in curve a; the resonance point of the second resonance is the center frequency of the second frequency band F2, which is close to 2.45 GHz in curve a; and the resonance point of the third resonance is the center frequency of the third frequency band F3, which is close to 2.8 GHz in curve a. Curve a shows that the first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0, which can cover 1.6 GHz to 2.8 GHz, and thus can fully cover the B3+B1+B40+B41 frequency bands, etc.

[0156] Please see Figure 15 Curve b represents the coupling area of ​​the first coupling gap G1, which is 4.7 mm. 2 The S11 parameter curves are shown for the first coupling slot G1 when the coupling spacing h1 is 0.8 mm. It can be seen that from low frequency to high frequency, the antenna assembly 100 sequentially generates three resonances (concave curves). The resonance point of the first resonance is the center frequency of the first frequency band F1, which is close to 1.8 GHz in curve b; the resonance point of the second resonance is the center frequency of the second frequency band F2, which is close to 2.45 GHz in curve b; and the resonance point of the third resonance is the center frequency of the third frequency band F3, which is close to 2.8 GHz in curve b. Curve b shows that the first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0, which can cover 1.6 GHz to 2.8 GHz, and thus can fully cover the B3+B1+B40+B41 frequency bands, etc.

[0157] Please see Figure 15 Curve c represents the coupling area of ​​the first coupling gap G1, which is 4 mm². 2 The overall efficiency curve is shown when the coupling spacing h1 of the first coupling gap G1 is 0.8 mm. Curve d represents the coupling area of ​​the first coupling gap G1 when it is 4.7 mm². 2 The overall efficiency curve is shown when the coupling spacing h1 of the first coupling gap G1 is 0.8 mm. Curve e represents the coupling area of ​​the first coupling gap G1 when it is 4 mm². 2The radiation efficiency curve is shown when the coupling spacing h1 of the first coupling slot G1 is 0.8 mm. Curve f represents the radiation efficiency when the coupling area of ​​the first coupling slot G1 is 4.7 mm². 2 The radiation efficiency curve when the coupling spacing h1 of the first coupling gap G1 is 0.8 mm.

[0158] As can be seen from the efficiency curve, the coupling area of ​​the first coupling gap G1 is 4 mm. 2 4.7mm 2 The antenna assembly 100 exhibits efficiencies greater than -4dB in the first frequency band F1, the second frequency band F2, and the third frequency band F3, which is greater than the conventional efficiency of -4.5dB. In other words, the coupling area of ​​the first coupling slot G1 provided in this application is 4mm². 2 The coupling spacing h1 of the first coupling gap G1 is 0.8 mm, the coupling spacing h2 of the second coupling gap G2 is 0.8 mm, and the coupling area of ​​the second coupling gap G2 is 5 mm². 2 The resulting antenna assembly 100 can fully cover the B3+B1+B40+B41 frequency band and improve the efficiency of the B3+B1+B40+B41 frequency band.

[0159] Furthermore, the efficiency curve also shows that the coupling area of ​​the first coupling gap G1 is 4.7 mm. 2 The efficiency of antenna assembly 100 at the first resonant point is higher than that of the first coupling slot G1 with a coupling area of ​​4 mm. 2 The efficiency of antenna assembly 100 at the first resonance. This indicates that increasing the coupling area of ​​the first coupling slot G1, increasing the first coupling amount of the first coupling slot G1, and increasing the resonance depth of the S11 curve of the first frequency band F1 can more effectively increase the efficiency of the first frequency band F1.

[0160] Furthermore, the efficiency curve also shows that the coupling area of ​​the first coupling gap G1 is 4.7 mm. 2 The efficiency of antenna assembly 100 at the second and third resonants is lower than that at the first coupling slot G1, where the coupling area is 4 mm. 2 The efficiency of antenna assembly 100 at the second and third resonances. This indicates that as the coupling area of ​​the first coupling slot G1 increases, the first coupling amount of the first coupling slot G1 increases, the resonance depth of the S11 curves of the second frequency band F2 and the third frequency band F3 decreases, and the efficiency of the second frequency band F2 and the third frequency band F3 is relatively low.

[0161] In other words, the larger the coupling area of ​​the first coupling gap G1, the deeper the resonance in the B3 and B1 bands will be, increasing efficiency by 0.5dB. The shallower the resonance in the B40 and B41 bands will be, decreasing efficiency by 0.3dB, creating a seesaw effect.

[0162] Please refer to Table 2, which shows the coupling area of ​​the first coupling gap G1, which is 4 mm². 2 4.7mm 2 The average efficiency of the comparative embodiments is compared. The coupling spacing h1 of the first coupling gap G1 and the coupling spacing h2 of the second coupling gap G2 are both 0.8 mm. The coupling area of ​​the second coupling gap G2 is 5 mm². 2 .

[0163] The antenna assembly 100 covers the B3, B1, B40, and B41 frequency bands. The average efficiency of the B3, B1, B40, and B41 frequency bands under different slot widths is calculated as shown in Table 2. It can be seen that as the coupling area increases, the S11 resonance of the B3 band deepens, and the antenna efficiency of the B3 band increases. For example, the coupling area of ​​the first coupling slot G1 is 4 mm. 2 At this point, the efficiency of B3 increases to -4dB, significantly higher than -4.5dB. The coupling area of ​​the first coupling gap G1 is 4.7mm². 2 At that time, the efficiency of B3 increased to -3.5dB, which is much higher than -4.5dB.

[0164] As the coupling area increases, the S11 resonance in the B1 band deepens, and the antenna efficiency in the B1 band increases. For example, the coupling area of ​​the first coupling slot G1 is 4 mm. 2 At this point, the efficiency of B1 increases to -3.8 dB, significantly higher than -4.5 dB. The coupling area of ​​the first coupling gap G1 is 4.7 mm. 2 At that time, the efficiency of B1 increased to -3.5dB, which is much higher than -4.5dB.

[0165] As the coupling area increases, the S11 resonance in the B40 band deepens, and the antenna efficiency in the B40 band increases. For example, the coupling area in the first coupling slot G1 is 4 mm. 2 At this point, the efficiency of B40 increases to -3.3dB, significantly higher than -4.5dB. The coupling area at the first coupling gap G1 is 4.7mm². 2 At that time, the efficiency of B40 increased to -3.5dB, which is much higher than -4.5dB.

[0166] As the coupling area increases, the S11 resonance in the B41 band deepens, and the antenna efficiency in the B41 band increases. For example, the coupling area in the first coupling slot G1 is 4 mm. 2 At this point, the efficiency of B41 increases to -3.1dB, significantly higher than -4.5dB. The coupling area in the first coupling slot G1 is 4.7mm². 2 At that time, the efficiency of B41 increased to -3.3dB, which is much higher than -4.5dB.

[0167] Table 2

[0168]

[0169] Specifically, the coupling area of ​​the second coupling gap G2 is 5mm. 2 6.2mm 2 The parameters and efficiency of S11 in the comparative embodiment are compared. The coupling spacing h1 of the first coupling gap G1 and the coupling spacing h2 of the second coupling gap G2 are both 0.8 mm. The coupling area of ​​the second coupling gap G2 is 4 mm². 2 .

[0170] Please see Figure 16 , Figure 16 The coupling area of ​​the second coupling gap G2 is 5mm. 2 6.2mm 2 The S11 parameters, radiation efficiency, and overall efficiency curves of the comparative embodiment are shown.

[0171] Please see Figure 16 Curve a represents the coupling area of ​​the second coupling gap G2, which is 5 mm². 2 The S11 parameter curves are shown for the second coupling slot G2 when the coupling spacing h2 is 0.8 mm. It can be seen that from low frequency to high frequency, the antenna assembly 100 sequentially generates three resonances (concave curves). The resonance point of the first resonance is the center frequency of the first frequency band F1, which is close to 1.8 GHz in curve a; the resonance point of the second resonance is the center frequency of the second frequency band F2, which is close to 2.45 GHz in curve a; and the resonance point of the third resonance is the center frequency of the third frequency band F3, which is close to 2.8 GHz in curve a. Curve a shows that the first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0, which can cover 1.6 GHz to 2.8 GHz, and thus can fully cover the B3+B1+B40+B41 frequency bands, etc.

[0172] Please see Figure 16 Curve b represents the coupling area of ​​the second coupling gap G2, which is 6.2 mm². 2The S11 parameter curves are shown for the second coupling slot G2 when the coupling spacing h2 is 0.8 mm. It can be seen that from low frequency to high frequency, the antenna assembly 100 sequentially generates three resonances (concave curves). The resonance point of the first resonance is the center frequency of the first frequency band F1, which is close to 1.8 GHz in curve b; the resonance point of the second resonance is the center frequency of the second frequency band F2, which is close to 2.45 GHz in curve b; and the resonance point of the third resonance is the center frequency of the third frequency band F3, which is close to 2.75 GHz in curve b. Curve b shows that the first frequency band F1, the second frequency band F2, and the third frequency band F3 form a continuous frequency band F0, which can cover 1.6 GHz to 2.8 GHz, and thus can fully cover the B3+B1+B40+B41 frequency bands, etc.

[0173] Please see Figure 16 Curve c represents the coupling area of ​​the second coupling gap G2, which is 5 mm². 2 The overall efficiency curve is shown when the coupling spacing h2 of the second coupling gap G2 is 0.8 mm. Curve d represents the coupling area of ​​the second coupling gap G2 when it is 6.2 mm². 2 The system efficiency curve is shown when the coupling spacing h2 of the second coupling gap G2 is 0.8 mm. Curve e represents the system efficiency when the coupling area of ​​the second coupling gap G2 is 5 mm². 2 The radiation efficiency curve is shown when the coupling spacing h2 of the second coupling slot G2 is 0.8 mm. Curve f represents the coupling area of ​​the second coupling slot G2 when it is 6.2 mm². 2 The radiation efficiency curve when the coupling spacing h2 of the second coupling gap G2 is 0.8 mm.

[0174] As can be seen from the efficiency curve, the coupling area of ​​the second coupling gap G2 is 5 mm. 2 6.2mm 2 The antenna assembly 100 exhibits efficiencies exceeding conventional efficiencies by 4.5 dB in the first frequency band F1, the second frequency band F2, and the third frequency band F3. In other words, the coupling area of ​​the second coupling slot G2 provided in this application is 5 mm². 2 The coupling spacing h2 of the second coupling gap G2 is 0.8 mm, the coupling spacing h1 of the first coupling gap G1 is 0.8 mm, and the coupling area of ​​the first coupling gap G1 is 4 mm². 2 The resulting antenna assembly 100 can fully cover the B3+B1+B40+B41 frequency band and improve the efficiency of the B3+B1+B40+B41 frequency band.

[0175] Furthermore, the efficiency curve also shows that the coupling area of ​​the second coupling gap G2 is 5 mm. 2 The efficiency of antenna assembly 100 at the first resonant point and the coupling area of ​​the second coupling slot G2 are 6.2 mm. 2The efficiency of the antenna assembly 100 at the first resonance is similar. This indicates that increasing the coupling area of ​​the second coupling slot G2 and increasing the first coupling amount of the second coupling slot G2 have little impact on the resonance depth of the S11 curve of the first frequency band F1, and have little effect on improving the efficiency of the first frequency band F1.

[0176] Furthermore, the efficiency curve also shows that the coupling area of ​​the second coupling gap G2 is 6.2 mm. 2 The efficiency curve is located at the second coupling gap G2 with a coupling area of ​​5 mm. 2 Above the efficiency curve.

[0177] The coupling area of ​​the second coupling gap G2 is 6.2 mm. 2 The efficiency of antenna assembly 100 at the second and third resonants is higher than that of the second coupling slot G2, whose coupling area is 5 mm. 2 The efficiency of antenna assembly 100 at the second and third resonances. This indicates that with the increase of the coupling area of ​​the second coupling slot G2, the second coupling amount of the second coupling slot G2 increases, the resonance depth of the S11 curves of the second frequency band F2 and the third frequency band F3 increases, and the efficiency of the second frequency band F2 and the third frequency band F3 increases.

[0178] In other words, the larger the coupling area of ​​the second coupling slot G2, the better the efficiency of the entire MHB band, with the most significant improvement in the B40 and B41 bands. Therefore, while satisfying the first coupling amount of the first coupling slot G1, it is necessary to maximize the second coupling amount of the second coupling slot G2 to improve the efficiency of the entire MHB band.

[0179] Please refer to Table 3, which shows the coupling area of ​​the second coupling gap G2, which is 5 mm². 2 6.2mm 2 The average efficiency of the comparative embodiments is compared. The coupling spacing h1 of the first coupling gap G1 and the coupling spacing h2 of the second coupling gap G2 are both 0.8 mm. The coupling area of ​​the first coupling gap G1 is 4 mm². 2 .

[0180] The antenna assembly 100 covers the B3, B1, B40, and B41 frequency bands. The average efficiency of the B3, B1, B40, and B41 frequency bands under different slot widths is calculated as shown in Table 3. It can be seen that as the coupling area increases, the S11 resonance of the B3 band deepens, and the antenna efficiency of the B3 band increases. For example, the coupling area of ​​the second coupling slot G2 is 5 mm. 2 At this point, the efficiency of B3 increases to -4dB, significantly higher than -4.5dB. The coupling area of ​​the second coupling slot G2 is 6.2mm². 2At that time, the efficiency of B3 increased to -3.9dB, which is much higher than -4.5dB.

[0181] As the coupling area increases, the S11 resonance in the B1 band deepens, and the antenna efficiency in the B1 band increases. For example, the coupling area of ​​the second coupling slot G2 is 5 mm. 2 At this point, the efficiency of B1 increases to -3.8 dB, significantly higher than -4.5 dB. The coupling area in the second coupling slot G2 is 6.2 mm². 2 At that time, the efficiency of B1 increased to -3.8dB, which is much higher than -4.5dB.

[0182] As the coupling area increases, the S11 resonance in the B40 band deepens, and the antenna efficiency in the B40 band increases. For example, the coupling area in the second coupling slot G2 is 5 mm². 2 At this point, the efficiency of B40 increases to -3.3dB, significantly higher than -4.5dB. The coupling area in the second coupling slot G2 is 6.2mm². 2 At that time, the efficiency of B40 increased to -3dB, which is much higher than -4.5dB.

[0183] As the coupling area increases, the S11 resonance in the B41 band deepens, and the antenna efficiency in the B41 band increases. For example, the coupling area in the second coupling slot G2 is 5 mm². 2 At this point, the efficiency of B41 increases to -3.1 dB, significantly higher than -4.5 dB. The coupling area in the second coupling slot G2 is 6.2 mm². 2 At that time, the efficiency of B41 increased to -2.7dB, which is much higher than -4.5dB.

[0184] Table 3

[0185]

[0186] Optionally, the first coupling area is greater than or equal to 4 mm. 2 ; and / or, the second coupling area is greater than or equal to 5 mm 2 .

[0187] For example, the first coupling area includes, but is not limited to, 4 mm. 2 5mm 2 6mm 2 7mm 2 8mm 2 9mm 2 10mm 2 11mm 2 12mm 2 etc., can also be 4-12mm. 2 Any value between these ranges. For example, the second coupling area includes, but is not limited to, 4 mm.2 5mm 2 6mm 2 7mm 2 8mm 2 9mm 2 10mm 2 11mm 2 12mm 2 etc., can also be 4-12mm. 2 Any value between.

[0188] As shown above, increasing the first coupling area of ​​the first coupling gap G1 increases the coupling amount of the first coupling gap G1, which can increase the efficiency of the first frequency band F1 (B1 and B3 frequency bands). Therefore, by designing the first coupling area of ​​the first coupling gap G1 to be greater than or equal to 4mm, 2 To improve the efficiency of the first frequency band F1 (B1 and B3 bands), for example, in a first coupling area equal to 4mm². 2 The second coupling area is equal to 5mm. 2 At that time, the efficiency of the first frequency band F1 (B1 and B3 bands) was -4dB and -3.8dB respectively, which is much higher than the conventional efficiency of -4.5dB. When the first coupling area is greater than 4mm... 2 The second coupling area is equal to 5mm. 2 At that time, the efficiency of the first frequency band F1 (B1 and B3 bands) was greater than -4dB and -3.8dB respectively, which was far higher than the conventional efficiency of -4.5dB.

[0189] As shown above, increasing the second coupling area of ​​the second coupling gap G2 increases the coupling amount, which can increase the efficiency of the first frequency band F1, the second frequency band F2, and the third frequency band F3. In particular, the efficiency increase of the second frequency band F2 and the third frequency band F3 is greater than the efficiency increase of the first frequency band F1. Therefore, by designing the second coupling area of ​​the second coupling gap G2 to be greater than or equal to 5mm, 2 To improve the efficiency of the second frequency band F2 and the third frequency band F3, for example, in a second coupling area equal to 5mm² 2 The first coupling area is equal to 4 mm. 2 At that time, the efficiencies of the second frequency band F2 and the third frequency band F3 were -3.3dB and -3.1dB, respectively, which were far higher than the conventional efficiency of -4.5dB. When the second coupling area is greater than 5mm... 2 The first coupling area is equal to 4 mm. 2 At that time, the efficiency of the first frequency band F1 and the second frequency band F2 was greater than -3.3dB and -3.1dB respectively, which was much higher than the conventional efficiency of -4.5dB.

[0190] Optionally, the first coupling area is 5-7 mm. 2Increasing the first coupling area leads to a decrease in the efficiency of the second frequency band F2 and the third frequency band F3. In this embodiment, the first coupling area is set to 5–7 mm. 2 This allows the first coupling gap G1 to have a high first coupling amount, improving the efficiency of the first frequency band F1, and also ensuring that the second frequency band F2 and the third frequency band F3 have relatively high efficiency.

[0191] Optionally, the second coupling area is 8-9 mm². 2 Increasing the first coupling area leads to a decrease in the efficiency of the second frequency band F2 and the third frequency band F3. In this embodiment, the second coupling area is set to 8-9 mm. 2 With the increase of the first coupling area to improve the efficiency of the first frequency band F1, the efficiency of the second frequency band F2 and the third frequency band F3 is also improved.

[0192] When adjusting the first coupling area of ​​the first coupling slot G1 and the second coupling area of ​​the second coupling slot G2, since the change of the first coupling slot G1 has a significant impact on the first frequency band F1, the second frequency band F2, and the third frequency band F3, while the change of the second coupling slot G2 has a smaller impact on the first frequency band F1, the antenna assembly 100 provided in this application can first adjust the first frequency band F1 (B3 band, B1 band) to a higher efficiency by adjusting the first coupling area of ​​the first coupling slot G1, for example, adjusting the B3 band to -3.1dB and the B1 band to -3.3dB. Then, the second coupling area of ​​the second coupling slot G2 is adjusted to adjust the second frequency band F2 (B40 band) and the third frequency band F3 (B41 band) to a higher efficiency, for example, adjusting the B40 band to -3.3dB and the B41 band to -2.7dB.

[0193] Please see Figure 17 , Figure 17 In the antenna assembly 100 provided in this application embodiment, the coupling spacing h1 of the first coupling slot G1 is 0.8 mm, and the coupling area of ​​the first coupling slot G1 is 6 mm². 2 The coupling spacing h2 of the second coupling gap G2 is 0.8 mm, and the coupling area of ​​the second coupling gap G2 is 8.8 mm². 2 A structural diagram.

[0194] Please see Figure 18 , Figure 18 yes Figure 17 The provided antenna assembly 100 includes its S11 parameters, radiation efficiency, and overall efficiency curves. Curve a is the S11 parameter curve of the antenna assembly 100. Curve b is the radiation efficiency curve of the antenna assembly 100. Curve c is the overall efficiency curve of the antenna assembly 100.

[0195] As can be seen from curve a, the frequency band supported by antenna assembly 100 covers 1.75 to 2.9 GHz, and antenna assembly 100 can cover the B3+B1+B40+B41 frequency band. As can be seen from curve c, antenna assembly 100 has high efficiency in the B3+B1+B40+B41 frequency band.

[0196] Please refer to Table 4. Compared with conventional efficiency, the antenna assembly 100 provided in this application can improve the efficiency by 0.5-1dB across the entire MHB band.

[0197] Table 4

[0198] frequency band The efficiency of the antenna assembly provided in this application Efficiency of traditional solutions Efficiency change value B3 -3.1dB -3.9dB +0.8 B1 -3.3dB -4dB +0.7 B40 -3.3dB -4dB +0.7 B41 -2.7dB -3.8dB +0.9

[0199] Optionally, under the excitation of the feed 30, among the multiple current modes formed on the main radiator 10 and the parasitic radiator 20, the first coupling gap G1 and the second coupling gap G2 are both at the current zero point position.

[0200] Among them, the current zero point position is the current weak point position. When the antenna assembly 100 is operating in the first frequency band F1, the second frequency band F2 and the third frequency band F3, there are two current zero points on the radiator of the antenna assembly 100, that is, two positions with low current intensity, thereby reducing the SAR value of the operating frequency band.

[0201] Taking the antenna assembly 100 located at the bottom of the frame as an example, when the operator places the electronic device in their hand to make or receive a call, the SAR values ​​of the antenna assembly 100 when it operates in the first frequency band F1 (e.g., B3 band, B1 band), the second frequency band F2 (e.g., B40 band), and the third frequency band F3 (B41 band) are relatively low. Therefore, the head SAR of the electronic device when it operates in the B3 band, B1 band, B40 band, and B41 band is relatively low.

[0202] Taking a 5mm 10g body SAR as an example for comparison, compared with a traditional bottom mid-to-high frequency antenna, the traditional bottom mid-to-high frequency antenna does not have two current zero points.

[0203] Please see Figures 19 to 26 , Figures 19 to 26 This is a schematic diagram comparing the SAR values ​​of the antenna assembly 100 provided in this application embodiment with those of a conventional bottom mid-to-high frequency antenna at a power of 24.7 dBm.

[0204] Please see Figure 19 and Figure 20 As can be seen, in the B3 band, the maximum SAR value of a traditional bottom-mounted mid-to-high frequency antenna at 1.8 GHz is 1.37 W / kg. The antenna assembly 100 provided in this embodiment of the application has a maximum SAR value of 1.1 W / kg at 1.8 GHz.

[0205] Please see Figure 21 and Figure 22 As can be seen, in the B1 band, the maximum SAR value of a traditional bottom-mounted mid-to-high frequency antenna at 1.98 GHz is 1.23 W / kg. The antenna assembly 100 provided in this embodiment of the application has a maximum SAR value of 1.07 W / kg at 1.98 GHz.

[0206] Please see Figure 23 and Figure 24 As can be seen, in the B40 band, the maximum SAR value of a traditional bottom-mounted mid-to-high frequency antenna at 2.35 GHz is 1.12 W / kg. The antenna assembly 100 provided in this embodiment of the application has a maximum SAR value of 1.01 W / kg at 2.35 GHz.

[0207] Please see Figure 25 and Figure 26 As can be seen, in the B41 band, the antenna assembly 100 provided in this embodiment has a maximum SAR value of 1.18 W / kg at 2.6 GHz. The conventional bottom mid-to-high frequency antenna has a maximum SAR value of 1.29 W / kg at 2.6 GHz.

[0208] As can be seen, the SAR value of the antenna assembly 100 provided in this application is 0.27 W / kg lower than that of the conventional solution in the B3 band, 0.16 W / kg lower than that of the conventional solution in the B1 band, and 0.1 W / kg lower in the B40 and B41 bands.

[0209] Optional, please refer to Figure 27 The first radiating segment 21 includes a first connection point J1 and a second connection point J2. The first connection point J1 is located at the third free end E3 or between the second free end E2 and the third free end E3. The second connection point J2 is located at the fourth free end E4 or between the fourth free end E4 and the second grounding point D2.

[0210] Understandably, the first connection point J1 is located at or near the third free terminal E3 to reduce the waste of radiating branches and improve the tuning effect of subsequent capacitor components. The second connection point J2 is located at or near the fourth free terminal E4 to reduce the waste of radiating branches and improve the tuning effect of subsequent capacitor components.

[0211] Please see Figure 27 The antenna assembly 100 further includes a capacitor element C0. One end of the capacitor element C0 is electrically connected to the first connection point J1, and the other end of the capacitor element C0 is electrically connected to the second connection point J2. The capacitor element C0 is connected in series between the first radiating section 21 and the second radiating section 22.

[0212] Please see Figure 27 The capacitor element C0 has a preset capacitance. A first coupling amount exists between the first free terminal E1 and the second free terminal E2. A second coupling amount exists between the third free terminal E3 and the fourth free terminal E4. The superimposed capacitance formed by the preset capacitance and the second coupling amount is greater than the first coupling amount.

[0213] In this embodiment, by setting a capacitor element C between the first radiation segment 21 and the second radiation segment 22, when the capacitance value of the capacitor element C0 is relatively large and meets the coupling requirements between the first radiation segment 21 and the second radiation segment 22, it is not necessary to require the coupling spacing and coupling area between the first radiation segment 21 and the second radiation segment 22 to meet specific requirements.

[0214] Generally, when designing the coupling spacing and coupling area of ​​coupling gaps, it is easily affected by structural tolerances, resulting in relatively poor consistency. It is difficult to adjust the coupling spacing and coupling area of ​​coupling gaps to the accurate spacing and accurate area to achieve the optimal coupling amount.

[0215] Based on this, this application adds a spring and a capacitor element C0 at the second coupling gap G2. The capacitor element C0 is used to change the coupling amount between the second coupling gaps G2, which can get rid of the structural limitations (the coupling spacing is controlled by cost and the coupling area is limited by structural space) and make the coupling amount design optimal.

[0216] In one optional implementation, the spacing of the second coupling gap G2 is relatively large, resulting in a smaller equivalent capacitance value formed by the second coupling gap G2. The capacitor element C0 between the first radiating segment 21 and the second radiating segment 22 serves as the main element for adjusting the coupling amount between them, allowing the capacitance value of the capacitor element C0 to reach the coupling amount required to improve the efficiency of the operating frequency band.

[0217] In one optional implementation, the spacing of the second coupling gap G2 is relatively small, resulting in a larger equivalent capacitance value formed by the second coupling gap G2. The capacitive element C0 between the first radiating segment 21 and the second radiating segment 22, along with the equivalent capacitance value formed by the second coupling gap G2, together serve as the primary elements for adjusting the coupling amount between the first radiating segment 21 and the second radiating segment 22. In this case, the equivalent capacitance value of the second coupling gap G2 can be calculated first, and then the capacitance value of the capacitive element C0 can be determined, so that the equivalent capacitance value of the second coupling gap G2 and the capacitance value of the capacitive element C0 are set to the coupling amount required to improve the efficiency of the operating frequency band.

[0218] Alternatively, another capacitor element can be provided at both ends of the first coupling gap G1 to adjust the coupling amount of the second coupling gap G2 to a suitable coupling amount, thereby improving the efficiency of the first frequency band F1, the second frequency band F2 and the third frequency band F3.

[0219] Optional, please refer to Figure 17 The coupling spacing h1 of the first coupling gap G1 is the same as the coupling spacing h2 of the second coupling gap G2. The coupling depth of the second coupling gap G2 is greater than or equal to the coupling depth of the first coupling gap G1, so as to increase the coupling area of ​​the second coupling gap G2 and the coupling area of ​​the first coupling gap G1 when the spacing is the same, which is beneficial to make the second coupling amount greater than the first coupling amount.

[0220] Specifically, the coupling spacing h1 of the first coupling gap G1 is the spacing along the X direction. The coupling spacing h2 of the second coupling gap G2 is the spacing along the X direction. The depth direction of the first coupling gap G1 is the Y-axis direction. By setting the thickness dimension of the parasitic radiator 20 at the second coupling gap G2 along the Y-axis direction to be greater than the thickness dimension of the main radiator 10 at the first coupling gap G1 along the Y-axis direction, the coupling depth of the second coupling gap G2 can be greater than or equal to the coupling depth of the first coupling gap G1. Furthermore, when milling the frame, a protrusion can be reserved on the inner side of the frame where the second coupling gap G2 is set, so that the second coupling gap G2 can be set at the protrusion position later.

[0221] Optional, please refer to Figure 28 The depth extension direction of at least a portion of the second coupling gap G2 is inclined relative to the extension direction of the main radiator 10.

[0222] Optionally, the main radiator 10 extends in the X direction, and the depth direction of the second coupling gap G2 intersects both the Y-axis and the X-axis, so that the coupling depth of the second coupling gap G2 is greater than or equal to the coupling depth of the first coupling gap G1. This increases the coupling area of ​​the second coupling gap G2 and the coupling area of ​​the first coupling gap G1 when the spacing is the same, which is beneficial to make the second coupling amount greater than the first coupling amount.

[0223] By setting the parasitic radiator 20 to have a thickness along the Y-axis at the second coupling gap G2 that is greater than the thickness along the Y-axis at the first coupling gap G1 that is set at the main radiator 10, and further, by reserving a protrusion on the inner side of the frame where the second coupling gap G2 is set during milling of the frame, and then setting the second coupling gap G2 at an angle at the protrusion, the coupling depth of the second coupling gap G2 can be greater than or equal to the coupling depth of the first coupling gap G1.

[0224] Please see Figure 29In the XY plane, the second coupling gap G2 can be opened not only by tilting, but also by arc, bend, L-shaped, etc., to create a longer path gap with a thinner frame thickness, thereby increasing the coupling amount.

[0225] Both the main radiator 10 and the parasitic radiator 20 are located on the bottom frame. In other words, the main radiator 10, the parasitic radiator 20, and the feed 30 form a bottom-edge mid-to-high frequency antenna.

[0226] Please see Figure 30 In the electronic device 1000 provided in this application, the electronic device 1000 further includes a USB connector 900. The first radiating segment 21 is directly opposite to and adjacent to the USB connector 900. A USB port 901 is provided on the first radiating segment 21. The first coupling gap G1, the USB port 901, and the second coupling gap G2 are arranged sequentially adjacent to each other.

[0227] Furthermore, the first coupling slot G1 and the second coupling slot G2 can be respectively located on both sides of the USB port 901 and placed close to the USB port. The double-slot antenna structure further improves the S-parameter resonance depth and enhances efficiency.

[0228] This application provides a double-slot suspended stub as the radiator of an antenna assembly 100. Utilizing the strong coupling effect of the double slots, the impedance of the antenna radiator is improved, and the resonance depth of the S11 curve is deepened, thereby enhancing antenna efficiency. It supports the entire MHB band and improves the antenna efficiency of the entire MHB band by 0.5-1 dB compared to conventional solutions. Furthermore, the SAR value of the antenna assembly 100 provided in this application is reduced by 0.1-0.3 W / kg compared to conventional solutions, reducing or eliminating the need for power back-off and mitigating the risk of super-SAR.

[0229] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, and such improvements and refinements are also considered to be within the protection scope of this application.

Claims

1. An antenna assembly, characterized in that, include: The main radiator includes a first free end, a feed point, and a first grounding point; A parasitic radiator includes a first radiating segment and a second radiating segment. The first radiating segment includes a second free end and a third free end, with a first coupling gap formed between the first free end and the second free end. The second radiating segment includes a fourth free end and a second grounding point, with a second coupling gap formed between the fourth free end and the third free end. The feed source is electrically connected to the feed point. The feed source is used to excite the main radiator to form a first current mode supporting a first frequency band. The feed source is also used to excite the parasitic radiator to support a third current mode supporting a third frequency band.

2. The antenna assembly as claimed in claim 1, characterized in that, The feed source is also used to excite the formation of a second current mode supporting the second frequency band on the main radiator and the parasitic radiator.

3. The antenna assembly as described in claim 2, characterized in that, The center frequency of the first frequency band is less than the center frequency of the second frequency band, and the center frequency of the second frequency band is less than the center frequency of the third frequency band.

4. The antenna assembly as described in claim 3, characterized in that, The first frequency band, the second frequency band, and the third frequency band form a continuous frequency band, which covers at least one of the frequency bands B3, B1, B40, and B41.

5. The antenna assembly as claimed in claim 2, characterized in that, The first free end and the second free end have a first coupling amount, and the third free end and the fourth free end have a second coupling amount, the second coupling amount being greater than the first coupling amount.

6. The antenna assembly as claimed in claim 1, characterized in that, The coupling spacing of the first coupling gap is less than or equal to 1 mm, the coupling spacing of the first coupling gap is greater than or equal to a first preset spacing, and the center frequency of the third frequency band is greater than or equal to 2650 MHz when the first preset spacing is used. And / or, the coupling spacing of the second coupling gap is less than or equal to 1 mm, the coupling spacing of the second coupling gap is greater than or equal to the second preset spacing, and the center frequency of the third frequency band is greater than or equal to 2650 MHz when the second preset spacing is used.

7. The antenna assembly as claimed in claim 1, characterized in that, The coupling spacing of the first coupling gap is greater than or equal to 0.5 mm; and / or, the coupling spacing of the second coupling gap is greater than or equal to 0.5 mm.

8. The antenna assembly as claimed in claim 1, characterized in that, The coupling spacing of the first coupling gap is 0.7 to 0.9 mm, and / or the width of the second coupling gap is 0.7 to 0.9 mm.

9. The antenna assembly as described in any one of claims 1 to 8, characterized in that, The first coupling gap has a first coupling area, and the second coupling gap has a second coupling area, wherein the second coupling area is greater than or equal to the first coupling area.

10. The antenna assembly as claimed in claim 9, characterized in that, The first coupling area is greater than or equal to 4 mm 2 And / or, the second coupling area is greater than or equal to 5 mm 2 .

11. The antenna assembly as claimed in claim 9, characterized in that, The first coupling area is 5-7 mm. 2 The second coupling area is 8-9 mm. 2 .

12. The antenna assembly as claimed in claim 1, characterized in that, The distance between the feed point and the first free end is less than the distance between the feed point and the first ground point, and the main current of the first current mode is distributed between the feed point and the first ground point.

13. The antenna assembly as claimed in claim 2, characterized in that, The second current mode includes a ring mode, and the main current distribution of the second current mode is between the first grounding point and the second grounding point.

14. The antenna assembly as claimed in claim 1, characterized in that, The main current distribution of the third current mode is between the second free end and the second grounding point, and the current intensity at the second grounding point is greater than the current intensity at the second free end.

15. The antenna assembly as claimed in claim 2, characterized in that, Both the first coupling gap and the second coupling gap are at the current zero point position.

16. The antenna assembly as claimed in claim 1, characterized in that, The first radiating segment includes a first connection point and a second connection point. The first connection point is located at the third free end or between the second free end and the third free end. The second connection point is located at the fourth free end or between the fourth free end and the second grounding point. The antenna assembly further includes a capacitor element, one end of which is electrically connected to the first connection point and the other end of which is electrically connected to the second connection point. The capacitor element has a preset capacitance. There is a first coupling amount between the first free end and the second free end, and a second coupling amount between the third free end and the fourth free end. The superimposed capacitance formed by the preset capacitance and the second coupling amount is greater than the first coupling amount.

17. The antenna assembly as claimed in claim 1, characterized in that, The coupling spacing of the first coupling gap is the same as that of the second coupling gap, and the coupling depth of the second coupling gap is greater than or equal to the coupling depth of the first coupling gap.

18. The antenna assembly as claimed in claim 17, characterized in that, The depth extension direction of at least a portion of the second coupling gap is inclined relative to the extension direction of the main radiator.

19. An electronic device, characterized in that, The electronic device includes a frame, a USB connector, and an antenna assembly as described in any one of claims 1 to 18. The frame includes a top frame, a first side frame, a bottom frame, and a second side frame connected in sequence. The main radiator and the parasitic radiator are both disposed on the bottom frame. The first radiating segment is directly opposite to and adjacent to the USB connector. A USB port is provided on the first radiating segment. The first coupling gap, the USB port, and the second coupling gap are arranged adjacent to each other in sequence.

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