Antenna unit, terminal housing and electronic terminal

Abstract

The present invention is applicable to the field of antenna technology, and provides an antenna unit, including: a dielectric substrate, having a first surface and a second surface opposite to each other; a slot structure, arranged on the first surface of the dielectric substrate, the slot structure including a first slot, a second slot and a third slot; the first slot including a first sub-slot and a first mother slot connected, the second slot including a second sub-slot and a second mother slot connected, the third slot including a third sub-slot, a third mother slot and a third father slot connected in sequence at an angle; and a feeding structure including a first feeding part and a second feeding part, the feeding structure is used to connect to a coaxial feeder to couple and feed the slot structure. The present invention also provides a terminal housing and an electronic terminal. The antenna unit of the present invention can make the overall volume of the wireless terminal housing product more compact and neat.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an antenna unit, a terminal housing and an electronic terminal. Background Art

[0002] At present, in order to obtain long-distance communication capabilities, wireless electronic terminals use a low-frequency band with strong spatial diffraction capabilities for their operating frequency. The wavelength of the electromagnetic wave at this frequency is relatively long. The corresponding external fiberglass antenna uses array superposition technology to achieve certain gain requirements, resulting in a longer antenna. When installed on the terminal product, the total volume is too large, which is very inconvenient to use in mobile scenarios. Summary of the invention

[0003] The present invention provides an antenna unit, a terminal housing and an electronic terminal, which can make the overall volume of a wireless terminal housing product more compact and neat.

[0004] An embodiment of a first aspect of the present application provides an antenna unit, including:

[0005] A dielectric substrate having a first surface and a second surface opposite to each other;

[0006] A slot structure, which runs through the first surface and the second surface of the dielectric substrate, wherein the slot structure comprises a first slot, a second slot and a third slot; the first slot comprises a first sub-slot and a first main slot connected at an angle, wherein the first sub-slot is away from one end of the first main slot and extends to the end of the first end of the dielectric substrate; the second slot comprises a second sub-slot and a second main slot connected at an angle, wherein the second sub-slot is spaced apart from the first sub-slot, and the end of the second sub-slot is away from the second main slot and is spaced apart from the end of the first end of the dielectric substrate, and the two ends of the second main slot are respectively located at the first sub-slot and the second main slot. on both sides of the first sub-slot, the first sub-slot and the first mother slot are located on the same side of the second mother slot, the first mother slot is connected to one end of the second mother slot away from the second sub-slot; the third slot and the second sub-slot are respectively arranged on both sides of the first sub-slot, the third slot and the second mother slot are respectively arranged on both sides of the first mother slot, the third slot includes a third sub-slot, a third mother slot and a third father slot connected in sequence at an angle, the third mother slot is spaced from the first sub-slot, the third father slot is connected to the first mother slot, and the width of the third father slot is greater than the width of the third mother slot; and

[0007] A feeding structure is arranged on the first surface of the dielectric substrate and includes a first feeding part and a second feeding part, wherein the first feeding part and the second feeding part are respectively arranged on both sides of an end of the second mother slot away from the second sub-slot, and the feeding structure is used to be connected to a coaxial feeder to couple and feed the slot structure.

[0008] In some embodiments, the first sub-slot is perpendicular to the first mother slot, the first sub-slot is perpendicular to the second mother slot, the third sub-slot, the third mother slot and the third father slot are vertically connected in sequence, and the third father slot is parallel to the first mother slot.

[0009] In some embodiments, the antenna unit can generate a first resonance with a wavelength of λ1mm, the length of the first sub-slot is 0.0779*λ1mm, the width is 3.5mm, the length of the first mother slot is 0.0451*λ1mm, and the width is 1.0mm.

[0010] In some embodiments, the antenna unit can generate a second resonance with a wavelength of λ2mm, the length of the second sub-slot is 0.0947*λ2mm, the width is 2.5mm, and the length of the second mother slot is 0.2106*λ2mm, the width is 1.5mm.

[0011] In some embodiments, the antenna unit can generate a third resonance with a wavelength of λ3mm. The length of the third sub-slot is 0.1735*λ3mm and the width is 1.5mm. The length of the third mother slot is 0.1048*λ3mm and the width is 1.5mm. The length of the third parent slot is 0.0927*λ3mm and the width is 7.5mm.

[0012] In some embodiments, the slot structure also includes a fourth slot, which is arranged parallel to the second mother slot, and one end of the first mother slot away from the first sub-slot, one end of the second mother slot away from the second sub-slot, and one end of the third parent slot away from the third mother slot are all connected to the fourth slot, and the fourth slot is used to adjust the S11 parameters of the first resonance, the second resonance and the third resonance.

[0013] In some embodiments, the length of the fourth gap is 0.1313*λ2, the width is 5.0 mm, λ2 is equal to λ1 / 1.1737, and λ3 is equal to 0.5868*λ2.

[0014] In some embodiments, the dielectric substrate is made of aluminum, the first feeding part and the second feeding part are both provided with connection holes, and the first feeding part and the second feeding part are both connected to the coaxial feed line via copper rivets or screws inserted through the connection holes.

[0015] An embodiment of a second aspect of the present application provides a terminal housing, the terminal housing comprising the antenna unit as described in the first aspect, the dielectric substrate in the antenna unit being at least one side wall of the terminal housing.

[0016] An embodiment of a third aspect of the present application provides an electronic terminal, which includes the terminal housing as described in the second aspect.

[0017] The antenna unit provided in the embodiment of the present invention has the beneficial effect that the relevant functions of the antenna unit can be realized by arranging the first slot, the second slot and the third slot on the dielectric substrate, which not only makes the overall volume of the product more compact and neat, but also enables the antenna unit to operate at three different frequencies through different combinations of the first slot, the second slot and the third slot. There is no need to purchase a separate fiberglass external antenna, thereby reducing project costs.

[0018] The terminal housing of the present invention directly integrates the antenna unit on at least one side wall of the terminal housing, making the overall volume more compact and neat, thereby saving production costs.

[0019] The electronic terminal of the present invention has a compact and neat overall volume and a low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 is a schematic structural diagram of an antenna unit in one embodiment of the present invention;

[0022] Figure 2 yes Figure 1 A size identification diagram of the slot structure of the antenna unit;

[0023] Figure 3 is a schematic diagram of the structure of a terminal housing in one of the embodiments;

[0024] Figure 4 yes Figure 1 Schematic diagram of the current path of the antenna unit at the frequency of 820MHz;

[0025] Figure 5 yes Figure 1 Schematic diagram of current distribution of the middle antenna unit at 820MHz frequency;

[0026] Figure 6 yes Figure 1 3D far-field radiation pattern of the middle antenna unit at 820MHz;

[0027] Figure 7 yes Figure 1 Far-field lobe diagram of the EH plane of the middle antenna unit at 820MHz frequency;

[0028] Figure 8 yes Figure 1 Schematic diagram of the current path of the antenna unit at the frequency of 1420MHz;

[0029] Fig. 9 yes Figure 1 Schematic diagram of current distribution of the middle antenna unit at 1420MHz frequency;

[0030] Fig.10 yes Figure 1 3D far-field radiation pattern of the middle antenna unit at 1420MHz;

[0031] Fig.11 yes Figure 1 Far-field lobe diagram of the EH plane of the middle antenna unit at 1420MHz frequency;

[0032] Fig.12 yes Figure 1 Schematic diagram of the current path of the antenna unit at the frequency point of 2420MHz;

[0033] Fig.13 yes Figure 1 Schematic diagram of current distribution of the middle antenna unit at 2420MHz frequency;

[0034] Fig.14 yes Figure 1 3D far-field radiation pattern of the middle antenna unit at 2420MHz;

[0035] Fig.15 yes Figure 1 Far-field lobe diagram of the EH plane of the middle antenna unit at 2420MHz frequency;

[0036] Fig.16 is the length of the fourth gap for different Figure 1 The influence of the S11 parameter on the overall antenna unit is shown in the figure;

[0037] Fig.17 yes Figure 1Schematic diagram of the S11 parameters of the entire antenna unit.

[0038] The meanings of the marks in the figure are:

[0039] 100, shell; 10, dielectric substrate; 20, gap structure; 21, first gap; 211, first sub-gap; 212, first mother gap; 22, second gap; 221, second sub-gap; 222, second mother gap; 23, third gap; 231, third sub-gap; 232, third mother gap; 233, third father gap; 24, fourth gap; 30, feeding structure; 31, first feeding unit; 32, second feeding unit. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings, i.e., embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In order to illustrate the technical solution of the present invention, the following is a description with reference to specific drawings and embodiments.

[0044] Please refer to Figure 1 An embodiment of the first aspect of the present application provides an antenna unit, including a dielectric substrate 10, a slot structure 20 and a feeding structure 30.

[0045] The dielectric substrate 10 may be a metal plate or a PCB board, and the dielectric substrate 10 has a first surface and a second surface opposite to each other.

[0046] The slot structure 20 penetrates the first surface and the second surface of the dielectric substrate 10 , and the slot structure 20 includes a first slot 21 , a second slot 22 and a third slot 23 .

[0047] The first slot 21 includes a first sub-slot 211 and a first main slot 212 connected at an angle, and one end of the first sub-slot 211 away from the first main slot 212 extends to the end of the first end of the dielectric substrate 10 .

[0048] The second slit 22 includes a second sub-slit 221 and a second main slit 222 connected at an angle, the second sub-slit 221 is spaced apart from the first sub-slit 211, one end of the second sub-slit 221 away from the second main slit 222 is spaced apart from the end of the first end of the dielectric substrate 10, two ends of the second main slit 222 are respectively located on both sides of the first sub-slit 211, the first sub-slit 211 and the first main slit 212 are located on the same side of the second main slit 222, and the first main slit 212 is connected to one end of the second main slit 222 away from the second sub-slit 221.

[0049] The third slit 23 and the second sub-slit 221 are respectively arranged on both sides of the first sub-slit 211, and the third slit 23 and the second mother slit 222 are respectively arranged on both sides of the first mother slit 212. The third slit 23 includes a third sub-slit 231, a third mother slit 232 and a third father slit 233 which are connected at an angle in sequence. The third mother slit 232 is spaced apart from the first sub-slit 211, and the third father slit 233 is connected to the first mother slit 212. The width of the third father slit 233 is greater than that of the third mother slit 232.

[0050] It can be understood that since the generation of the resonant frequency of the metal slot antenna depends on the path along which the current flows along both sides of the slot, current paths of different lengths correspond to different resonant frequencies. In this embodiment, the current paths on both sides of the first slot 21, the second slot 22 and the third slot 23 have different lengths, which can correspond to three different resonant frequencies. The end of the first sub-slot 211 extending from one end of the first main slot 212 to the first end of the dielectric substrate 10 can cut off the connection between the dielectric substrate 10 on both sides of the first slot 21, forcing the current to flow only from the second slot 22 and the third slot 23. The current path is lengthened, and the antenna size is reduced at the target frequency.

[0051] The feeding structure 30 is arranged on the first surface of the dielectric substrate 10 and includes a first feeding part 31 and a second feeding part 32. The first feeding part 31 and the second feeding part 32 are respectively arranged on both sides of an end of the second mother slot 222 away from the second sub-slot 221. The feeding structure 30 is used to be connected to the coaxial feed line to couple and feed the slot structure 20.

[0052] The antenna unit provided in the embodiment of the present invention can realize the relevant functions of the antenna unit by setting the first slot 21, the second slot 22 and the third slot 23 on the dielectric substrate 10, which not only makes the overall volume of the product more compact and neat, but also enables the antenna unit to operate at three different frequencies through different combinations of the first slot 21, the second slot 22 and the third slot 23. There is no need to purchase a fiberglass external antenna separately, which reduces the project cost. Frequency modulation can be automatically implemented through a software frequency hopping algorithm in the future.

[0053] The antenna unit provided in the embodiment of the present invention adjusts the sizes of the first slot 21, the second slot 22 and the third slot 23. According to the principle that one frequency in free space corresponds to one working wavelength λ, different λ values ​​are taken and the slot sizes of the first slot 21, the second slot 22 and the third slot 23 are optimized and adjusted. In theory, any three-band combination design within Sub6 (0-6GHz) can be realized, thereby realizing customization of multi-band antennas according to customer needs.

[0054] Please refer again Figure 1 In some embodiments, the first sub-slot 211 is perpendicular to the first mother slot 212, the first sub-slot 211 is perpendicular to the second mother slot 222, the third sub-slot 231, the third mother slot 232 and the third father slot 233 are vertically connected in sequence, and the third father slot 233 is parallel to the first mother slot 212.

[0055] By adopting the above solution, the directionality of the antenna unit during operation can be better controlled.

[0056] Please refer to Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In some embodiments, the antenna unit can generate a first resonance with a wavelength of λ1mm, the length L1a of the first sub-slot 211 is 0.0779*λ1mm, the width W1a is 3.5mm, the length L1b of the first mother slot 212 is 0.0451*λ1mm, and the width W1b is 1.0mm.

[0057] By adopting the above solution, the antenna unit can generate the first resonance.

[0058] In this embodiment, Figure 4The direction of the arrow in the middle represents the first current path, which provides the first resonance at 820MHz. The second slot 22 branches and the third slot 23 branches on both sides of the first slot 21 mainly play the role of changing the first current path. The first resonance is determined by the first slot 21, the second slot 22 and the third slot 23. The first slot 21 adopts different widths to make the current produce impedance mutations on the path through which it flows, thereby changing the inductive and capacitive components to obtain a better S11 value.

[0059] Please refer to Figure 1 , Figure 2 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 In some embodiments, the antenna unit can generate a second resonance with a wavelength of λ2mm, the length L2a of the second sub-slot 221 is 0.0947*λ2mm, the width W2a is 2.5mm, the length L2b of the second mother slot 222 is 0.2106*λ2mm, and the width W2b is 1.5mm.

[0060] By adopting the above solution, the antenna unit can generate a second resonance.

[0061] In this embodiment, Figure 8 The direction of the arrow in the middle represents the second current path, which provides the second resonance at 1420MHz. The second slot 22 and the first slot 21 on the same side of the second slot 22 mainly play the role of changing the second current path. The second resonance is determined by the first slot 21, the second slot 22 and the third slot 23. The first slot 21 adopts different widths to make the current produce a sudden impedance change on the path through which the current flows, thereby changing the inductive and capacitive components to obtain a better S11 value.

[0062] Please refer to Figure 1 , Figure 2 , Fig.12 , Fig.13 , Fig.14 and Fig.15 In some embodiments, the antenna unit can generate a third resonance with a wavelength of *λ3mm, the length L3a of the third sub-slot 231 is 0.1735*λ3mm, the width W3a is 1.5mm, the length L3b of the third mother slot 232 is 0.1048*λ3mm, the width W3b is 1.5mm, and the length L3c of the third parent slot 233 is 0.0927*λ3mm, and the width W3c is 7.5mm.

[0063] By adopting the above solution, the antenna unit can generate a third resonance.

[0064] In this embodiment, Fig.12The direction of the arrow in the middle represents the third current path, which provides the third resonance at 2420MHz. The second slot 22 and the third slot 23 on the same side of the third slot 23 mainly play the role of changing the third current path. The third resonance is jointly determined by the first slot 21, the second slot 22 and the third slot 23. The first slot 21 adopts different widths to make the current produce impedance mutations on the path through which it flows, thereby changing the inductive and capacitive components to obtain a better S11 value.

[0065] Please refer to Figure 1 , Figure 2 and Fig.16 In some embodiments, the slot structure 20 further includes a fourth slot 24, which is arranged in parallel with the second mother slot 222, and one end of the first mother slot 212 away from the first sub-slot 211, one end of the second mother slot 222 away from the second sub-slot 221, and one end of the third parent slot 233 away from the third mother slot 232 are all connected to the fourth slot 24, and the fourth slot 24 is used to adjust the S11 parameters of the first resonance, the second resonance, and the third resonance.

[0066] By adopting the above solution, the fourth slot 24 can be used to adjust the S11 parameter of the entire antenna unit to improve the electromagnetic wave conversion efficiency at the target frequency.

[0067] It can be understood that by adjusting the length and width of the fourth slot 24, the inductive and capacitive components of the antenna at the three target frequencies are jointly changed to compromise the S11 parameters corresponding to the three frequencies. When S11<-10dB, the electromagnetic wave conversion efficiency of the antenna unit at this frequency meets the requirements, and the smaller the value, the higher the efficiency.

[0068] Optionally, the length of the fourth slot 24 is 0.1313*λ2, the width is 5.0 mm, λ2 is equal to λ1 / 1.1737, and λ3 is equal to 0.5868*λ2, so that the S11 values ​​at the three frequency points are all less than -10 dB.

[0069] Please refer to Figure 1 In some embodiments, the dielectric substrate 10 is made of aluminum, and connection holes are provided at the first feeding part 31 and the first feeding part 31 and the second feeding part 32. The first feeding part 31 and the second feeding part 32 are connected to the coaxial feed line through copper rivets or screws inserted in the connection holes. When connected to the coaxial feed line through screws inserted in the connection holes, copper washers are installed on the screws.

[0070] By adopting the above solution, it is possible to avoid the problem that the aluminum dielectric substrate 10 is difficult to be tinned, and the inner and outer core wires of the coaxial feeder are difficult to be directly welded on the first feeder 31 and the second feeder.

[0071] In some of the embodiments, the gap structure 20 is filled with a dielectric material. For example, the dielectric material is filled using a nano injection molding process, which can achieve the invisibility of the antenna unit and improve the overall texture.

[0072] Please refer to Figure 1 and Figure 3 An embodiment of the second aspect of the present application provides a terminal housing 100 , which includes an antenna unit as in the first aspect, and a dielectric substrate 10 in the antenna unit is at least one side wall of the terminal housing 100 .

[0073] The terminal housing 100 of the present invention directly integrates the antenna unit on at least one side wall of the terminal housing 100 , making the overall volume more compact and neat, thereby saving production costs.

[0074] Optionally, two opposite side walls of the terminal housing 100 are both dielectric substrates 10 in the antenna units, which can increase the spatial distance between the antenna units and optimize their isolation to a certain extent.

[0075] Please refer to Figures 1 to 3 The embodiment of the present application provides a terminal housing 100, which is made of metal aluminum and has a rectangular structure. Its dimensions are 0.9656λ2 (length)*0.9656λ2 (width)*0.1657λ2 (depth). The two opposite side walls of the terminal housing 100 are both dielectric substrates 10. The thickness of the dielectric substrate 10 is 7 mm. The dielectric substrate 10 has a first surface and a second surface opposite to each other. A slot structure 20 and a feeding structure 30 are arranged on the first surface of the dielectric substrate 10. The slot structure 20 runs through the first surface and the second surface of the dielectric substrate 10.

[0076] The slot structure 20 includes a first slot 21, a second slot 22, a third slot 23 and a fourth slot 24. The dielectric substrate 10, the slot structure 20 and the feeding structure 30 can be used to form an antenna unit, which can generate a first resonance with a wavelength of λ1mm, a second resonance with a wavelength of λ2mm and a third resonance with a wavelength of *λ3mm, and the frequencies of the first resonance, the second resonance and the third resonance are 820MHz, 1420MHz and 2420MHz respectively.

[0077] The first slit 21 includes a first sub-slit 211 and a first main slit 212 which are vertically connected. One end of the first sub-slit 211 away from the first main slit 212 extends to the end of the first end of the dielectric substrate 10. The length of the first sub-slit 211 is 0.0779*λ1mm and the width is 3.5mm. The length of the first main slit 212 is 0.0451*λ1mm and the width is 1.0mm.

[0078] The second slot 22 includes a second sub-slot 221 and a second main slot 222 connected vertically. The second sub-slot 221 is parallel to and spaced from the first sub-slot 211. One end of the second sub-slot 221 away from the second main slot 222 is spaced from the end of the first end of the dielectric substrate 10. Two ends of the second main slot 222 are located on both sides of the first sub-slot 211, respectively. The first sub-slot 211 and the first main slot 212 are located on the same side of the second main slot 222. The first main slot 212 is connected to one end of the second main slot 222 away from the second sub-slot 221. The length of the second sub-slot 221 is 0.0947*λ2mm, and the width is 2.5mm. The length of the second main slot 222 is 0.2106*λ2mm, and the width is 1.5mm.

[0079] The third slit 23 and the second sub-slit 221 are respectively arranged on both sides of the first sub-slit 211, and the third slit 23 and the second mother slit 222 are respectively arranged on both sides of the first mother slit 212. The third slit 23 includes a third sub-slit 231, a third mother slit 232 and a third father slit 233 which are vertically connected in sequence. The third mother slit 232 is parallel to the first sub-slit 211 and arranged at intervals. The third father slit 233 is connected to the first mother slit 212, and the width of the third father slit 233 is greater than the width of the third mother slit 232. The length of the third sub-slit 231 is 0.1735*λ3mm and the width is 1.5mm. The length of the third mother slit 232 is 0.1048*λ3mm and the width is 1.5mm. The length of the third father slit 233 is 0.0927*λ3mm and the width is 7.5mm.

[0080] The fourth slot 24 is arranged in parallel with the second mother slot 222, and one end of the first mother slot 212 away from the first sub-slot 211, one end of the second mother slot 222 away from the second sub-slot 221, and one end of the third parent slot 233 away from the third mother slot 232 are all connected to the fourth slot 24, and the fourth slot 24 is used to adjust the S11 parameters of the first resonance, the second resonance, and the third resonance. The length of the fourth slot 24 is 0.1313*λ2, and the width is 5.0mm.

[0081] The terminal housing 100 of this embodiment can design the electronic frequency of the antenna unit therein to be 820 MHz, 1420 MHz and 2420 MHz, and its overall volume is more compact and neat, and the production cost is lower.

[0082] Please refer to Fig.17 It can be seen that the antenna unit in this embodiment has formed very good resonance characteristics within the ranges of 790MHz to 860MHz, 1400MHz to 1470MHz and 2370MHz to 2500MHz.

[0083] An embodiment of a third aspect of the present application provides an electronic terminal, which includes the terminal housing 100 as described in the second aspect.

[0084] The electronic terminal can be a mobile phone, a smart watch, a tablet computer, a laptop computer, a wireless radio, a router, etc. The electronic terminal of the present invention has a compact and neat overall size and a low production cost.

[0085] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An antenna unit, characterized in that: include: A dielectric substrate having a first surface and a second surface opposite to each other; A slot structure, which runs through the first surface and the second surface of the dielectric substrate, wherein the slot structure comprises a first slot, a second slot and a third slot; the first slot comprises a first sub-slot and a first main slot connected at an angle, wherein one end of the first sub-slot away from the first main slot extends to the end of the first end of the dielectric substrate; the second slot comprises a second sub-slot and a second main slot connected at an angle, wherein the second sub-slot is spaced apart from the first sub-slot, one end of the second sub-slot away from the second main slot is spaced apart from the end of the first end of the dielectric substrate, and both ends of the second main slot are respectively located at the first sub-slot. on both sides of the first sub-slit, the first sub-slit and the first mother slit are located on the same side of the second mother slit, and the first mother slit is connected to one end of the second mother slit away from the second sub-slit; the third slit and the second sub-slit are respectively arranged on both sides of the first sub-slit, and the third slit and the second mother slit are respectively arranged on both sides of the first mother slit, the third slit includes a third sub-slit, a third mother slit and a third father slit connected in sequence at an angle, the third mother slit is spaced from the first sub-slit, the third father slit is connected to the first mother slit, and the width of the third father slit is greater than the width of the third mother slit; and A feeding structure, provided on the first surface of the dielectric substrate and comprising a first feeding portion and a second feeding portion, wherein the first feeding portion and the second feeding portion are respectively provided on both sides of an end of the second mother slot away from the second sub-slot, and the feeding structure is used to be connected to a coaxial feeder to couple and feed the slot structure; The slot structure also includes a fourth slot, which is arranged in parallel with the second mother slot, and one end of the first mother slot away from the first sub-slot, one end of the second mother slot away from the second sub-slot, and one end of the third father slot away from the third mother slot are all connected to the fourth slot, and the fourth slot is used to adjust the S11 parameters of the first resonance, the second resonance, and the third resonance; the material of the dielectric substrate is aluminum, and the first feeding part and the second feeding part are both provided with connecting holes, and the first feeding part and the second feeding part are connected to the coaxial feed line through copper rivets or screws inserted in the connecting holes.

2. The antenna unit according to claim 1, characterized in that The first sub-slot is perpendicular to the first mother slot, the first sub-slot is perpendicular to the second mother slot, the third sub-slot, the third mother slot and the third father slot are vertically connected in sequence, and the third father slot is parallel to the first mother slot.

3. The antenna unit according to claim 1 or 2, characterized in that: The antenna unit can generate a first resonance with a wavelength of λ1mm, the length of the first sub-slot is 0.0779*λ1mm, and the width is 3.5mm, and the length of the first main slot is 0.0451*λ1mm, and the width is 1.0mm.

4. The antenna unit according to claim 3, characterized in that The antenna unit can generate a second resonance with a wavelength of λ2mm, the length of the second sub-slot is 0.0947*λ2mm, and the width is 2.5mm, and the length of the second main slot is 0.2106*λ2mm, and the width is 1.5mm.

5. The antenna unit according to claim 4, characterized in that The antenna unit can generate a third resonance with a wavelength of λ3mm, the length of the third sub-slot is 0.1735*λ3mm, and the width is 1.5mm, the length of the third mother slot is 0.1048*λ3mm, and the width is 1.5mm, and the length of the third father slot is 0.0927λ3mm, and the width is 7.5mm.

6. The antenna unit according to claim 1, characterized in that The length of the fourth gap is 0.1313*λ2, the width is 5.0 mm, λ2 is equal to λ1 / 1.1737, and λ3 is equal to 0.5868*λ2.

7. A terminal housing, characterized in that: The terminal housing comprises the antenna unit according to any one of claims 1 to 6, and the dielectric substrate in the antenna unit is at least one side wall of the terminal housing.

8. An electronic terminal, characterized in that: The electronic terminal comprises the terminal housing according to claim 7.

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