Antenna unit and electronic device

Abstract

The embodiment of the invention provides an antenna unit and electronic equipment, the antenna unit comprises a feed source, a radiator, a first parasitic branch knot and a second parasitic branch knot, the radiator comprises a feed point, and the feed source is electrically connected with the feed point; the first parasitic branch knot is coupled with the radiator and generates a first resonant mode under excitation of the feed source so as to at least support a first frequency band; the second parasitic branch knot is coupled with the radiator and generates a second resonant mode to at least support a second frequency band and a third resonant mode to at least support a third frequency band under excitation of the feed source, the second frequency band is larger than the first frequency band, and the third frequency band is larger than the second frequency band. The single antenna is used for achieving radiation of three frequency bands of the Wi-Fi antennas, interference among the Wi-Fi antennas is reduced or avoided, the single antenna can be arranged on one side of the handwriting pen, the isolation degree between the Wi-Fi antennas and other high-frequency antennas is improved, the performance of the Wi-Fi antennas can be improved, and the problems of jamming and definition when a user watches a video online are solved.

Description

Technical Field

[0001] The present application belongs to the field of antenna technology, and in particular relates to an antenna unit and an electronic device. Background Art

[0002] With the advancement and development of technology, electronic devices such as mobile phones are generally updated to 5G (the 5 th Users use 5G smartphones for daily social interaction, mobile office, online video viewing, online payment, online shopping and other activities.

[0003] Electronic devices typically have numerous antennas to cover a wide range of operating frequency bands. The increased number of antennas in an electronic device can lead to poorer isolation between them, which in turn reduces the antenna's transmit and receive performance. This phenomenon is particularly pronounced in 5G electronic devices with styluses. For users, using a 5G electronic device with a stylus can cause lag and unclear video quality when watching videos online over Wi-Fi due to the low isolation between Wi-Fi antennas or between Wi-Fi antennas and high-frequency antennas, reducing the user experience. Summary of the Invention

[0004] The present application provides an antenna unit and an electronic device, which can improve the performance of Wi-Fi antennas and reduce the occurrence of freezes and clarity issues when users watch videos online.

[0005] In a first aspect, an embodiment of the present application provides an antenna unit, comprising a feed source, a radiator, a first parasitic branch, and a second parasitic branch, wherein the radiator comprises a feed point, and the feed source is electrically connected to the feed point;

[0006] The first parasitic branch is coupled to the radiator and generates a first resonant mode under the excitation of the feed source to support at least a first frequency band;

[0007] The second parasitic branch is coupled to the radiator and generates a second resonant mode under the excitation of the feed source to support at least a second frequency band, and generates a third resonant mode to support at least a third frequency band, the second frequency band is greater than the first frequency band, and the third frequency band is greater than the second frequency band.

[0008] Optionally, the length of the first parasitic branch is greater than the length of the radiator, and the length of the radiator is greater than the length of the second parasitic branch.

[0009] Optionally, the antenna unit also includes a matching circuit, the input end of the matching circuit is electrically connected to the feeding point, and the output end of the matching circuit is electrically connected to the radiator, and the matching circuit is used to increase the resonance depth of the first frequency band and / or to increase the resonance depth of the second frequency band and the third frequency band.

[0010] Optionally, the matching circuit includes:

[0011] a first capacitor, one end of the first capacitor being connected to the radiator, and the other end of the first capacitor being connected to the feeding point;

[0012] a first inductor, one end of the first inductor being connected to the other end of the first capacitor, and the other end of the first inductor being grounded.

[0013] Optionally, the matching circuit includes:

[0014] a second inductor, one end of the second inductor being connected to the feeding point, and the other end of the second inductor being connected to the radiator;

[0015] A second capacitor, one end of the second capacitor is connected to the other end of the second inductor, and the other end of the second capacitor is grounded.

[0016] Optionally, the matching circuit includes:

[0017] a first capacitor, one end of which is connected to the radiator;

[0018] a first inductor, one end of the first inductor being connected to the other end of the first capacitor, and the other end of the first inductor being grounded;

[0019] a second inductor, one end of the second inductor being connected to the feeding point, the other end of the second inductor being connected to the other end of the first capacitor, and the second inductor being smaller than the first inductor;

[0020] A second capacitor, one end of the second capacitor is connected to the other end of the second inductor, the other end of the second capacitor is grounded, and the second capacitor is smaller than the first capacitor.

[0021] Optionally, the radiator is disposed between the first parasitic branch and the second parasitic branch, and a first coupling gap is formed between the radiator and the first parasitic branch, and a second coupling gap is formed between the radiator and the second parasitic branch;

[0022] One end of the first parasitic branch away from the radiator is grounded, one end of the second parasitic branch away from the radiator is grounded, and the feeding point is arranged at one end of the radiator close to the first parasitic branch.

[0023] Optionally, the first frequency band includes the Wi-Fi 2.4G frequency band, the second frequency band includes the Wi-Fi 5G frequency band, and the third frequency band includes the Wi-Fi 6E frequency band.

[0024] In a second aspect, an embodiment of the present application further provides an electronic device, comprising a middle frame and an antenna unit as described in any one of the above items, wherein the antenna unit is arranged on the middle frame.

[0025] Optionally, the middle frame has four side walls connected in sequence, the electronic device further includes a stylus, the stylus is attached to one of the four side walls, and the antenna unit is arranged on the side wall where the stylus is located.

[0026] In the antenna unit and electronic device of the embodiments of the present application, a single antenna is used to achieve radiation in three frequency bands of the Wi-Fi antenna, reducing or avoiding interference between Wi-Fi antennas. The single antenna can be set on one side of the stylus, improving the isolation between the Wi-Fi antenna and other high-frequency antennas, and can improve the performance of the Wi-Fi antenna, reducing the occurrence of freezes and clarity issues when users watch videos online. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0028] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0029] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0030] Figure 2 This is another structural diagram of an electronic device provided in an embodiment of the present application.

[0031] Figure 3 A schematic structural diagram of an antenna unit provided in an embodiment of the present application.

[0032] Figure 4 The resonance diagram (upper figure) and Smith chart (lower figure) of the antenna unit without a matching circuit provided in an embodiment of the present application.

[0033] Figure 5 This is another structural schematic diagram of the antenna unit provided in an embodiment of the present application.

[0034] Figure 6 The resonance diagram (upper figure) and Smith chart (lower figure) of the antenna unit with a high-pass matching circuit provided in an embodiment of the present application.

[0035] Figure 7 A circuit diagram of a matching circuit provided in an embodiment of the present application.

[0036] Figure 8 The resonance diagram (upper figure) and Smith chart (lower figure) of the antenna unit with a high-pass matching circuit and a low-pass matching circuit provided in the embodiment of the present application.

[0037] Figure 9 This is a diagram of the free space passive efficiency of the antenna unit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0039] Nowadays, electronic devices like mobile phones are increasingly being upgraded to 5G smartphones. People rely on these devices for daily social interactions, mobile office work, online video streaming, online payments, and online shopping. Regarding mobile phone antenna design, 5G smartphones have numerous antennas and frequency bands, including two low-frequency antennas, four medium-frequency antennas, four high-frequency antennas, four ultra-high-frequency antennas, two Wi-Fi antennas, two GPS (Global Positioning System) antennas, and an NFC (Near Field Communication) antenna. The sheer number of antennas in a single phone inevitably degrades isolation between antennas, reducing both transmit and receive performance, and ultimately lowering both uplink and downlink rates. This phenomenon is exacerbated in 5G phones equipped with styluses. The stylus is typically placed on the side of the phone, on the lower left or right side. Because the antenna radiation environment on this side is poor, current 5G phones don't have an antenna near the stylus. This complicates the antenna layout space for the entire 5G phone. Consequently, antenna isolation on 5G phones with styluses is worse, particularly between the two Wi-Fi antennas and between the Wi-Fi antenna and the high-frequency antenna. For users, using a 5G phone with a stylus and connecting to Wi-Fi to watch online videos can cause lag and unclear video quality, creating a less user-friendly experience. Mobile phone manufacturers' current solution is to integrate both the Wi-Fi and high-frequency antennas into a single antenna to address the isolation issue and improve Wi-Fi antenna performance. However, this solution requires an additional filter chip on the RF side, increasing hardware cost and sacrificing Wi-Fi transmission power. Therefore, further improvement is needed.

[0040] The present application provides an antenna unit and electronic device that improve the isolation of a Wi-Fi antenna by improving the structure of the antenna itself, which will be described below with reference to the accompanying drawings.

[0041] See also Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Electronic device 1000 includes, but is not limited to, mobile phones, tablet computers, laptop computers, computers, wearable devices, drones, robots, digital cameras, and other devices with communication functions. This embodiment of the present application uses a mobile phone as an example, and other electronic devices can refer to this embodiment.

[0042] See also Figure 2As shown, electronic device 1000 includes an antenna unit 100. The operating environment of antenna unit 100 will be described using a mobile phone as an example. Electronic device 1000 includes a display screen 200, a middle frame 300, and a back cover 400, arranged along the thickness direction. The middle frame 300 includes four side walls 310 connected in sequence. These walls 310 enclose a space for accommodating components such as a motherboard, camera module, receiver module, battery, and various sensors. The middle frame 300 also includes a middle plate, with the four side walls 310 surrounding the periphery of the middle plate. The display screen 200, middle plate, and back cover 400 are stacked in sequence. One side of the four side walls 310 surrounds the edge of the display screen 200, while the other side of the four side walls 310 surrounds the edge of the back cover 400, forming the complete exterior structure of electronic device 1000. In this embodiment, the four side walls 310 and the middle plate are separate structures, and the four side walls 310 and the back cover 400 can also be separate structures. In other embodiments, the four side walls 310 and the middle plate are separate structures, and the four side walls 310 and the back cover 400 can be an integral structure. In other embodiments, the four side walls 310 and the middle plate are an integral structure, and the four side walls 310 and the back cover 400 can be separate structures.

[0043] Among them, at least part of the antenna unit 100 can be set in the receiving space formed by the four side walls 310 and the back cover 400, or in the receiving space formed by the display screen 200 and the four side walls 310. Of course, part of the antenna unit 100 can also be set in or on the surface of the display screen 200, the surface of the middle frame 300, the surface of the back cover 400, or integrated with the side walls 310 of the middle frame 300, or integrated with the back cover 400, etc.

[0044] Exemplarily, the electronic device 1000 further includes a stylus pen 500 , which is attached to one of the four side walls 310 . In this embodiment, the antenna unit 100 may be disposed on the side wall 310 where the stylus pen 500 is located.

[0045] See also Figure 3 As shown, the antenna unit 100 provided in the embodiment of the present application includes a feed source 110 , a radiator 120 , a first parasitic branch 130 and a second parasitic branch 140 .

[0046] The radiator 120 is a port for the antenna unit 100 to transmit and receive radio frequency signals, wherein the radio frequency signals are transmitted in the form of electromagnetic wave signals in the air medium. The radiator 120 is made of a conductive material, including but not limited to metals, alloys, conductive oxides, conductive polymers, graphene, etc.

[0047] The shape of the radiator 120 includes but is not limited to a strip, a sheet, a rod, a coating, a film, and the like. Figure 3The illustrated radiator 120 is merely an example and should not be construed as limiting the shape of the radiator 120. In this embodiment, the radiator 120 is linear. In other embodiments, the radiator 120 may extend along a curved or other path. The radiator 120 may extend along a line of uniform width, or in the form of a strip with varying widths, such as a gradient width or a price area.

[0048] Exemplary forms of the radiator 120 include, but are not limited to, the metal sidewall 310 of the mobile phone, a metal frame embedded in the plastic sidewall 310, a metal radiator located within or on the sidewall 310, a flexible printed circuit board (FPC) antenna formed on a flexible printed circuit board (FPC), a laser direct forming antenna formed by laser direct forming, a printed direct forming antenna formed by printing, a conductive sheet antenna, etc. In this embodiment, the radiator 120 is taken as a portion of the metal sidewall 310 of the mobile phone.

[0049] The radiator 120 includes a feeding point 122 . The present application does not limit the position of the feeding point 122 on the radiator 120 .

[0050] Feed source 110 is electrically connected to feed point 122 to feed power to radiator 120 through feed point 122. Feed source 110 includes, but is not limited to, a radio frequency transceiver chip. Feed source 110 can transmit radio frequency signals to radiator 120 through feed point 122, and the radio frequency signals can excite radiator 120 to generate a resonant current.

[0051] Exemplarily, the electronic device 1000 further includes a mainboard, on which the feed source 110 is disposed. Electrical connection methods between the feed source 110 and the feed point 122 include, but are not limited to, direct soldering or indirect connection methods such as coaxial cables, microstrip lines, conductive springs, and conductive adhesive. For example, the feed source 110 is electrically connected to the feed point 122 via a feed spring 150 disposed on the mainboard, and the feed point 122 is electrically connected to the radiator 120 via the feed spring 150.

[0052] The material, form, and shape of the first parasitic branch 130 may refer to the radiator 120 . In the embodiment of the present application, the first parasitic branch 130 is a portion of the metal sidewall 310 of the mobile phone.

[0053] The first parasitic stub 130 is coupled to the radiator 120 and generates a first resonance mode under the excitation of the feed source 110 to support at least a first frequency band.

[0054] The material, form, and shape of the second parasitic branch 140 may refer to the radiator 120 . In the embodiment of the present application, the second parasitic branch 140 is a portion of the metal side wall 310 of the mobile phone.

[0055] The second parasitic stub 140 is coupled to the radiator 120 and generates a second resonant mode under the excitation of the feed source 110 to support at least a second frequency band, and a third resonant mode to support at least a third frequency band. The second frequency band is greater than the first frequency band, and the third frequency band is greater than the second frequency band.

[0056] It should be noted that the antenna unit 100 of the present application is a Wi-Fi antenna that supports at least three frequency bands simultaneously. For example, the first frequency band includes the Wi-Fi 2.4G band, corresponding to a frequency range of 2400MHz to 2500MHz; the second frequency band includes the Wi-Fi 5G band, corresponding to a frequency range of 5150MHz to 5850MHz; and the third frequency band includes the Wi-Fi 6E band, corresponding to a frequency range of 5925MHz to 7125MHz.

[0057] In the antenna unit 100 provided in the embodiment of the present application, a single antenna is used to achieve radiation in three Wi-Fi frequency bands, reducing or avoiding interference between Wi-Fi antennas. The single antenna can be set on the side of the stylus, improving the isolation between the Wi-Fi antenna and other high-frequency antennas, which can improve the performance of the Wi-Fi antenna and reduce the occurrence of lag and clarity issues when users watch videos online. By making full use of the space on the side of the stylus 500 of 5G electronic devices such as mobile phones, the antenna unit 100 is designed as a Wi-Fi antenna that supports three Wi-Fi frequency bands simultaneously, which can effectively solve the isolation problems between Wi-Fi antennas and between Wi-Fi antennas and high-frequency antennas in 5G electronic devices with styluses.

[0058] Since the first parasitic branch 130 is coupled with the radiator 120 to support one operating frequency band, and the second parasitic branch 140 is coupled with the radiator 120 to support two operating frequency bands, combined with the fact that the length of the radiator required for the low frequency band is longer and the length of the radiator required for the high frequency band is shorter, in the embodiment of the present application, the length of the first parasitic branch 130 is greater than the length of the radiator 120, and the length of the radiator 120 is greater than the length of the second parasitic branch 140.

[0059] In the embodiment of the present application, the radiator 120, the first parasitic branch 130, and the second parasitic branch 140 are arranged on the same side wall 310 of the electronic device 1000. The radiator 120 can be arranged between the first parasitic branch 130 and the second parasitic branch 140, and the radiator 120 and the first parasitic branch 130 form a first coupling gap 132, and the radiator 120 and the second parasitic branch 140 form a second coupling gap 142.

[0060] The end of the first parasitic branch 130 away from the radiator 120 is grounded, the end of the second parasitic branch 140 away from the radiator 120 is grounded, and the feeding point 122 is provided at the end of the radiator 120 close to the first parasitic branch 130. It is understood that the "grounding" described in this application refers to an electrical connection to a reference ground, or an electrical connection to a reference ground system, and its electrical connection methods include but are not limited to direct welding, or indirect electrical connection through coaxial cables, microstrip lines, conductive springs, conductive adhesives, etc. In this embodiment, the aluminum-magnesium alloy structure of the board in the electronic device 1000 serves as the reference ground, and the first parasitic branch 130 and the second parasitic branch 140 are both electrically connected to the reference ground.

[0061] In this embodiment of the present application, the antenna unit 100 can be located on the left side of the back of the electronic device 1000, adjacent to the stylus 500. The design of the dimensions of the antenna unit 100 can be described below. In this embodiment of the present application, the clearance of the antenna unit 100 is 0.9 mm, and the dimensions of the antenna unit 100 are 32.7 mm x 3.3 mm. The length of the radiator 120 can be 10.4 mm, the length of the first parasitic branch 130 can be 16.8 mm, and the length of the second parasitic branch 140 can be 2.5 mm. The lengths of the first coupling slot 132 and the second coupling slot 142 can both be 1.5 mm. The widths of the radiator 120, the first parasitic branch 130, and the second parasitic branch 140 can be equal, for example, each can be 2 mm. The width of the feed spring 150 can be set to 1.3 mm.

[0062] The Wi-Fi antenna unit 100 uses a metal frame for radiation and is surrounded by metal ground, which forms a physical isolation from other antennas and has good isolation. The antenna unit 100 is a parasitic antenna and a monopole antenna, and supports Wi-Fi 2.4G band, Wi-Fi 5G band, and Wi-Fi 6E band. The corresponding passive antenna efficiencies are -2.5dB, -2.5dB, and -3.5dB, respectively. The performance of the antenna unit 100 is good. For users, when watching videos online via Wi-Fi, the picture quality is clear and smooth without any lag.

[0063] It should be noted that in the embodiment of the present application, the feed point 122, the radiator 120, the first coupling slot 132 and the first parasitic branch 130 form a parasitic antenna. The feed point 122, the radiator 120, the second coupling slot 142 and the second parasitic branch 140 form a monopole antenna and a parasitic antenna.

[0064] See also Figure 4 As shown, when the antenna unit 100 has no matching circuit, the original resonance diagram and Smith chart of the antenna unit 100 are as shown in FIG. Figure 4 . Figure 4In the figure, numbers 1 to 2 correspond to the resonance range of Wi-Fi 2.4G; numbers 3 to 4 correspond to the resonance range of Wi-Fi 5G; and numbers 5 to 6 correspond to the resonance range of Wi-Fi 6E. Figure 4 As can be seen from the figure, the 2.4G resonance and 6E resonance of the Wi-Fi antenna unit 100 are relatively shallow. For an antenna, the resonance depth affects the antenna's bandwidth, impedance matching, radiation efficiency, gain, standing wave ratio, rotation angle, radiation pattern, sensitivity and other performance. Therefore, it is necessary to increase the resonance depth of the Wi-Fi antenna unit 100.

[0065] See also Figure 5 Exemplarily, the antenna unit 100 further includes a matching circuit 160, an input end of the matching circuit 160 is electrically connected to the feed point 122, and an output end of the matching circuit 160 is electrically connected to the radiator 120, and the matching circuit 160 is used to increase the resonance depth of the first frequency band and / or increase the resonance depth of the second frequency band and the third frequency band.

[0066] In the first implementation, the matching circuit 160 is used to increase the resonance depth of the first frequency band. For example, the matching circuit 160 includes a first capacitor and a first inductor, one end of the first capacitor is connected to the radiator 120, and the other end of the first capacitor is connected to the feed point 122. One end of the first inductor is connected to the other end of the first capacitor, and the other end of the first inductor is grounded. It can be understood that starting from the antenna port, the first capacitor is first connected in series, then the first inductor is connected in parallel to the ground, and finally connected to the RF port. Among them, the matching circuit 160 at this time can be understood as a high-pass matching circuit, the first capacitor can be a 5pF capacitor, and the first inductor can be a 3nH inductor.

[0067] See also Figure 6 As shown, after adding matching circuit 160, the resonance of Wi-Fi 2.4G is significantly deepened from the perspective of antenna resonance. From the perspective of the Smith chart, starting from the antenna port, the series connection of the first capacitor shifts the 2.4G resonance between the second and third quadrants toward the third quadrant, while the parallel connection of the first inductor shifts the 2.4G resonance in the third quadrant toward the center of the Smith chart.

[0068] In the second implementation, the matching circuit 160 is used to increase the resonance depth of the second frequency band and the third frequency band. For example, the matching circuit 160 includes a second inductor and a second capacitor, one end of the second inductor is connected to the feeding point 122, the other end of the second inductor is connected to the radiator 120, one end of the second capacitor is connected to the other end of the second inductor, and the other end of the second capacitor is grounded. It can be understood that starting from the antenna port, the second capacitor is first connected in parallel to the ground, then the second inductor is connected in series, and finally connected to the RF port. Among them, the matching circuit 160 at this time can be understood as a low-pass matching circuit, the second capacitor can be a 0.55pF capacitor, and the second inductor can be a 1.6nH inductor. After adding the matching circuit 160, the resonance of Wi-Fi 5G and Wi-Fi 6E is significantly deepened.

[0069] In a third implementation, the matching circuit 160 is used to increase the resonance depth of the first frequency band, the second frequency band, and the third frequency band. Figure 7 For example, matching circuit 160 includes a first capacitor C1, a first inductor L1, a second capacitor C2, and a second inductor L2. One end of the first capacitor C1 is connected to the radiator 120, one end of the first inductor L1 is connected to the other end of the first capacitor C1, and the other end of the first inductor L1 is grounded GND. One end of the second inductor L2 is connected to the feed point 122, and the other end of the second inductor L2 is connected to the other end of the first capacitor C1. The second inductor L2 is smaller than the first inductor L1. One end of the second capacitor C2 is connected to the other end of the second inductor L2, and the other end of the second capacitor C2 is grounded GND. The second capacitor C2 is smaller than the first capacitor C1.

[0070] The first capacitor may be a 5pF capacitor, the first inductor may be a 3nH inductor, the second capacitor may be a 0.55pF capacitor, and the second inductor may be a 1.6nH inductor.

[0071] It should be noted that the first capacitor C1 and the first inductor L1 can be understood as a high-pass matching circuit, the second capacitor C2 and the second inductor L2 can be understood as a low-pass matching circuit, and the matching circuit 160 of the antenna unit 100 can be described as starting from the antenna port, first adding a group of high-pass matching circuits, that is, first connecting a 5pF capacitor in series, and then connecting a 3nH inductor in parallel to the ground GND, and then adding a group of low-pass matching circuits, that is, first connecting a 0.55pF capacitor in parallel to the ground GND, and then connecting 1.6nH in series, and finally connecting to the RF port.

[0072] See also Figure 8As shown in the figure, from the perspective of antenna resonance, the resonance of Wi-Fi 2.4G is significantly deepened, and the resonances of Wi-Fi 5G and Wi-Fi 6E are also significantly deepened. From the perspective of the Smith chart, starting from the antenna port, the effect of adding a 5pF capacitor in series can be described as shifting the resonance of 2.4G, located between the second and third quadrants, to the third quadrant. The effect of adding a 3nH inductor in parallel to GND can be described as shifting the resonance of 2.4G, located in the third quadrant, toward the center of the Smith chart. The effect of adding a 0.55pF capacitor in parallel to GND can be described as shifting the resonance of Wi-Fi 5G and 6E, located in the first quadrant, to the fourth quadrant. The effect of adding a 1.6nH inductor in series can be described as shifting the resonance of Wi-Fi 5G and 6E, located in the fourth quadrant, toward the center of the Smith chart. Since this matching is a low-pass match, it has little impact on the resonance of Wi-Fi 2.4G.

[0073] like Figure 9 As shown, antenna performance is mainly measured by passive efficiency. For the antenna unit 100 in the embodiment of the present application, the average free space passive efficiency corresponding to Wi-Fi 2.4G, 5G and 6E are -2.5dB, -2.5dB and -3.5dB, respectively, covering the three frequency ranges of 2400MHz to 2500MHz, 5150MHz to 5850MHz and 5925MHz to 7125MHz.

[0074] The embodiment of the present application provides a Wi-Fi antenna design for a 5G electronic device 1000 with a stylus 500. The antenna unit 100 can be located on the lower left side of the back of the 5G electronic device 1000, adjacent to the stylus 500. The size of the antenna unit 100 is 32.7 mm × 3.3 mm, and the corresponding clearance height of the antenna unit 100 is 0.9 mm. The antenna unit 100 is a parasitic antenna and a monopole antenna, using a metal frame for radiation. It supports Wi-Fi 2.4G, Wi-Fi 5G, and Wi-Fi 6E at the same time. The corresponding free space passive efficiencies are -2.5dB, -2.5dB, and -3.5dB, respectively, and the antenna performance is good. The antenna unit 100 of the embodiment of the present application effectively solves the problem of poor isolation between the Wi-Fi antennas of the 5G electronic device 1000 with a stylus, and between the Wi-Fi antenna and the high-frequency antenna, thereby improving the performance of the Wi-Fi antenna. The beneficial effect brought to users is that when users watch videos online through Wi-Fi, the picture quality is clear and smooth without any lag.

[0075] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more features.

[0077] The antenna unit and electronic device provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An antenna unit, characterized in that: The invention comprises a feed source, a radiator, a first parasitic branch and a second parasitic branch, wherein the radiator comprises a feed point, and the feed source is electrically connected to the feed point; The first parasitic branch is coupled to the radiator and generates a first resonant mode under the excitation of the feed source to support at least a first frequency band; The second parasitic branch is coupled to the radiator and generates a second resonant mode under the excitation of the feed source to support at least a second frequency band, and generates a third resonant mode to support at least a third frequency band, the second frequency band is greater than the first frequency band, and the third frequency band is greater than the second frequency band.

2. The antenna unit according to claim 1, wherein: The length of the first parasitic branch is greater than the length of the radiator, and the length of the radiator is greater than the length of the second parasitic branch.

3. The antenna unit according to claim 2, wherein: The antenna unit also includes a matching circuit, the input end of the matching circuit is electrically connected to the feed point, and the output end of the matching circuit is electrically connected to the radiator. The matching circuit is used to increase the resonance depth of the first frequency band and / or to increase the resonance depth of the second frequency band and the third frequency band.

4. The antenna unit according to claim 3, wherein: The matching circuit comprises: a first capacitor, one end of the first capacitor being connected to the radiator, and the other end of the first capacitor being connected to the feeding point; a first inductor, one end of the first inductor being connected to the other end of the first capacitor, and the other end of the first inductor being grounded.

5. The antenna unit according to claim 3, wherein: The matching circuit comprises: a second inductor, one end of the second inductor being connected to the feeding point, and the other end of the second inductor being connected to the radiator; A second capacitor, one end of the second capacitor is connected to the other end of the second inductor, and the other end of the second capacitor is grounded.

6. The antenna unit according to claim 3, wherein: The matching circuit comprises: a first capacitor, one end of which is connected to the radiator; a first inductor, one end of the first inductor being connected to the other end of the first capacitor, and the other end of the first inductor being grounded; a second inductor, one end of the second inductor being connected to the feeding point, the other end of the second inductor being connected to the other end of the first capacitor, and the second inductor being smaller than the first inductor; A second capacitor, one end of the second capacitor is connected to the other end of the second inductor, the other end of the second capacitor is grounded, and the second capacitor is smaller than the first capacitor.

7. The antenna unit according to claim 1, wherein: The radiator is disposed between the first parasitic branch and the second parasitic branch, and a first coupling gap is formed between the radiator and the first parasitic branch, and a second coupling gap is formed between the radiator and the second parasitic branch; One end of the first parasitic branch away from the radiator is grounded, one end of the second parasitic branch away from the radiator is grounded, and the feeding point is arranged at one end of the radiator close to the first parasitic branch.

8. The antenna unit according to any one of claims 1 to 7, characterized in that: The first frequency band includes the Wi-Fi 2.4G frequency band, the second frequency band includes the Wi-Fi 5G frequency band, and the third frequency band includes the Wi-Fi 6E frequency band.

9. An electronic device, characterized in that: The invention comprises a middle frame and the antenna unit according to any one of claims 1 to 8, wherein the antenna unit is arranged on the middle frame.

10. The electronic device according to claim 9, characterized in that The middle frame has four side walls connected in sequence. The electronic device further includes a stylus pen, which is attached to one of the four side walls. The antenna unit is arranged on the side wall where the stylus pen is located.

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