Antenna Structure and Electronic Device

Abstract

An antenna structure, comprising: a dielectric substrate, a ground layer and a radiation layer located on opposite sides of the dielectric substrate. The ground layer has two first slits, and the two first slits are symmetric about the central axis of the antenna structure in a first direction to introduce a radiation null. The radiation layer has two second slits, the two second slits are symmetric about the central axis, and in a second direction, the edges of the two second slits are aligned with the edges of the radiation layer to introduce another radiation null. The second direction is perpendicular to the first direction.

Description

Technical Field

[0001] This document relates to, but is not limited to, the field of communication technologies, and particularly refers to an antenna structure and an electronic device. Background Art

[0002] As an important part of mobile communication, the research and design of antennas play a crucial role in mobile communication. The biggest change brought by the fifth-generation mobile communication technology (5G) is the innovation of the user experience. The quality of the signal in the terminal device directly affects the user experience. Therefore, the design of 5G terminal antennas will surely become one of the important links in 5G deployment. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail in this document. This overview is not intended to limit the scope of protection of the claims.

[0004] Embodiments of the present disclosure provide an antenna structure and an electronic device.

[0005] On the one hand, embodiments of the present disclosure provide an antenna structure, including: a dielectric substrate, a ground layer and a radiation layer located on opposite sides of the dielectric substrate. The ground layer has two first slots, and the two first slots are symmetric about the central axis of the antenna structure in the first direction to introduce a radiation null. The radiation layer has two second slots, the two second slots are symmetric about the central axis, and in the second direction, the edges of the two second slots are aligned with the edges of the radiation layer to introduce another radiation null. The second direction is perpendicular to the first direction.

[0006] In some exemplary embodiments, the orthographic projection of the second slot on the dielectric substrate is located on a side closer to the central axis of the orthographic projection of the first slot on the dielectric substrate.

[0007] In some exemplary embodiments, the two first slots and the two second slots both extend in the second direction, and the length of the first slot in the second direction is greater than the length of the second slot in the second direction.

[0008] In some exemplary embodiments, the antenna structure further includes: at least one first shorting post and at least one second shorting post, and the first shorting post and the second shorting post connect the ground layer and the radiation layer. The first shorting post and the second shorting post are symmetric about the central axis. The orthographic projections of the first shorting post and the second shorting post on the dielectric substrate are located on a side farther from the central axis of the orthographic projection of the first slot on the dielectric substrate.

[0009] In some exemplary embodiments, the number of both the first shorting post and the second shorting post is three.

[0010] In some exemplary embodiments, the ground layer is connected to the outer conductor of the coaxial conductive post, and the radiation layer is connected to the inner conductor of the coaxial conductive post. The orthographic projection of the coaxial conductive post on the dielectric substrate is located between the orthographic projections of the two second slots on the dielectric substrate.

[0011] In some exemplary embodiments, the coaxial conductive post is connected to a radio frequency connector, and the radio frequency connector is located on the side of the ground layer away from the dielectric substrate.

[0012] In some exemplary embodiments, in the second direction, the first ends of the two second slots communicate with each other and are flush with the edge of the radiation layer.

[0013] In some exemplary embodiments, in the second direction, the first ends of the two second slots communicate with each other and are flush with the edge of the radiation layer, and the second ends of the two second slots also communicate with each other and are flush with the edge of the radiation layer. The first end and the second end are located on opposite sides of the central axis of the antenna structure in the second direction.

[0014] On the other hand, an embodiment of the present disclosure provides an electronic device including the antenna structure as described above.

[0015] Other aspects can be understood after reading and understanding the drawings and the detailed description. Description of the Drawings

[0016] The drawings are used to provide a further understanding of the technical solutions of the present disclosure, and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solutions of the present disclosure and do not constitute a limitation to the technical solutions of the present disclosure. The shapes and sizes of one or more components in the drawings do not reflect the actual scale, and the purpose is only to schematically illustrate the content of the present disclosure.

[0017] Figure 1A It is a schematic plan view of the antenna structure according to at least one embodiment of the present disclosure;

[0018] Figure 1B is Figure 1A a partial cross-sectional schematic view of the antenna structure shown along the P-P direction;

[0019] Figure 1C is Figure 1A a schematic diagram of the simulation result of the S11 curve of the antenna structure shown;

[0020] Figure 1D is Figure 1A a schematic diagram of the simulation result of the gain curve of the antenna structure shown;

[0021] Figure 1E(a) to Figure 1E(c) is Figure 1ADistribution diagram of surface current vectors of the radiation layer of the antenna structure shown;

[0022] Figure 1F(a) to Figure 1F(c) is Figure 1A Distribution diagram of surface current vectors of the ground layer of the antenna structure shown;

[0023] Figure 2A Another schematic plan view of the antenna structure according to at least one embodiment of the present disclosure;

[0024] Figure 2B is Figure 2A Schematic diagram of the simulation result of the S11 curve of the antenna structure shown;

[0025] Figure 2C is Figure 2A Schematic diagram of the simulation result of the gain curve of the antenna structure shown;

[0026] Figure 3A Another schematic plan view of the antenna structure according to at least one embodiment of the present disclosure;

[0027] Figure 3B is Figure 3A Schematic diagram of the simulation result of the S11 curve of the antenna structure shown;

[0028] Figure 3C is Figure 3A Schematic diagram of the simulation result of the gain curve of the antenna structure shown;

[0029] Figure 4A Another schematic plan view of the antenna structure according to at least one embodiment of the present disclosure;

[0030] Figure 4B is Figure 4A Schematic diagram of the simulation result of the S11 curve of the antenna structure shown;

[0031] Figure 4C is Figure 4A Schematic diagram of the simulation result of the gain curve of the antenna structure shown;

[0032] Figure 5 Schematic diagram of the electronic device according to at least one embodiment of the present disclosure. Detailed implementation manners

[0033] The embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The embodiments can be implemented in multiple different forms. It is easy for those of ordinary skill in the art to understand the fact that the forms and contents can be transformed into one or more forms without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure should not be construed as being limited only to the contents described in the following embodiments. Without conflict, the embodiments and features in the embodiments of the present disclosure can be combined arbitrarily with each other.

[0034] In the accompanying drawings, sometimes for clarity, the sizes, thicknesses of layers or areas of one or more constituent elements are exaggerated. Therefore, one embodiment of the present disclosure is not necessarily limited to such dimensions, and the shapes and sizes of multiple components in the drawings do not reflect the true proportions. In addition, the accompanying drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes or values shown in the drawings.

[0035] The ordinal numbers such as "first", "second", "third", etc. in the present disclosure are set to avoid confusion of constituent elements, rather than to limit in terms of quantity. "Multiple" in the present disclosure means two or more quantities.

[0036] In the present disclosure, for convenience, terms indicating orientation or positional relationships such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are used to describe the positional relationships of constituent elements with reference to the accompanying drawings. This is only for the convenience of describing this specification and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present disclosure. The positional relationships of the constituent elements are appropriately changed according to the directions describing the constituent elements. Therefore, it is not limited to the terms described in the specification and can be appropriately replaced according to the circumstances.

[0037] In the present disclosure, unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate member, or the communication inside two elements. For those of ordinary skill in the art, the meanings of the above terms in the present disclosure can be understood according to the circumstances.

[0038] In the present disclosure, "electrically connected" includes a case where constituent elements are connected together by an element having a certain electrical effect. The "element having a certain electrical effect" is not particularly limited as long as it can transmit an electrical signal between the constituent elements to be connected. Examples of the "element having a certain electrical effect" include not only electrodes and wirings, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having one or more functions.

[0039] In the present disclosure, "parallel" means a state where the angle formed by two straight lines is -10° or more and 10° or less, and thus, a state where the angle is -5° or more and 5° or less can be included. In addition, "perpendicular" means a state where the angle formed by two straight lines is 80° or more and 100° or less, and thus, a state where the angle is 85° or more and 95° or less can be included.

[0040] "About" in the present disclosure means not strictly limiting the boundary and allowing a value within the process and measurement error range.

[0041] At least one embodiment of the present disclosure provides an antenna structure, including: a dielectric substrate, radiation patches located on opposite sides of the dielectric substrate, and a ground layer. The ground layer has two first slots, and the two first slots are symmetric about the central axis of the antenna structure in a first direction to introduce a radiation null. The radiation layer has two second slots, the two second slots are symmetric about the central axis, and in a second direction, the edges of the two second slots are aligned with the edges of the radiation layer to introduce another radiation null. The second direction is perpendicular to the first direction.

[0042] In this embodiment, by introducing two symmetric first slots in the ground layer, a radiation null is introduced at high frequencies, and by introducing two symmetric second slots in the radiation patch, a radiation null is introduced at low frequencies, so that radiation nulls are introduced on both sides of the resonant frequency point of the antenna to achieve filtering characteristics. The antenna structure of this embodiment can be applied to the 5G band, and the film layer structure of the antenna structure is simple and has a low profile, so that the filtering function can be achieved without introducing additional discrete devices and avoiding large insertion loss.

[0043] In some exemplary embodiments, the orthographic projection of the second slot on the dielectric substrate is located on a side closer to the central axis of the orthographic projection of the first slot on the dielectric substrate.

[0044] In some exemplary embodiments, the two first slots and the two second slots both extend in the second direction, and the length of the first slot in the second direction is greater than the length of the second slot in the second direction.

[0045] In some exemplary embodiments, the antenna structure further includes: at least one first shorting post and at least one second shorting post. The first shorting post and the second shorting post connect the ground layer and the radiation layer; the first shorting post and the second shorting post are symmetric about the central axis; the orthographic projections of the first shorting post and the second shorting post on the dielectric substrate are located on one side of the orthographic projection of the first slot on the dielectric substrate away from the central axis. In this exemplary embodiment, by introducing the symmetric first shorting post and second shorting post, the out-of-band rejection characteristic of the gain passband can be improved.

[0046] In some exemplary embodiments, the number of both the first shorting posts and the second shorting posts is three. However, this embodiment is not limited thereto.

[0047] In some exemplary embodiments, the ground layer is connected to the outer conductor of the coaxial conductive post, and the radiation layer is connected to the inner conductor of the coaxial conductive post. The orthographic projection of the coaxial conductive post on the dielectric substrate is located between the orthographic projections of the two second slots on the dielectric substrate. In this example, a coaxial feeding method is adopted to feed the radiation layer.

[0048] In some exemplary embodiments, the coaxial conductive post is connected to a radio frequency connector (SMA), and the radio frequency connector is located on the side of the ground layer away from the dielectric substrate. The SAM is used to connect an external radio frequency signal.

[0049] In some exemplary embodiments, in the second direction, the first ends of the two second slots are connected and flush with the edge of the radiation layer. For example, the two second slots are strip-shaped, and the two connected second slots can be in a Y shape. However, this embodiment is not limited thereto.

[0050] In some exemplary embodiments, in the second direction, the first ends of the two second slots are connected and flush with the edge of the radiation layer, and the second ends of the two second slots are also connected and flush with the edge of the radiation layer. The first end and the second end are located on opposite sides of the central axis of the antenna structure in the second direction. However, this embodiment is not limited thereto.

[0051] The antenna structure of this embodiment is illustrated below by way of multiple examples.

[0052] Figure 1A It is a schematic plan view of the antenna structure of at least one embodiment of the present disclosure. Figure 1B is Figure 1A a partial cross-sectional schematic view along the P-P direction in. In some exemplary embodiments, as Figure 1A and Figure 1BAs shown, the antenna structure of this exemplary embodiment includes: a dielectric substrate 10, a radiation layer 12 and a ground layer 13 located on opposite sides of the dielectric substrate 10. The ground layer 13 has two first slots 131a and 131b. The two first slots 131a and 131b are symmetric about the central axis OO' of the antenna structure in the first direction D1. The two first slots 131a and 131b both extend along the second direction D2. The first direction D1 is perpendicular to the second direction D2. The lengths of the first slots 131a and 131b along the second direction D2 are less than the length of the ground layer 13 along the second direction D2. The orthographic projections of the first slots 131a and 131b on the dielectric substrate 10 may both be rectangles. However, this embodiment does not limit this.

[0053] In some exemplary embodiments, as Figure 1A and Figure 1B shown, the radiation layer 12 has two second slots 121a and 121b. The two second slots 121a and 121b are symmetric about the central axis OO', and on the second direction D2, the edges of the two second slots 121a and 121b are aligned with the edges of the radiation layer 12. The two second slots 121a and 121b both extend along the second direction D2. The length of the second slot 121a along the second direction D2 is less than the length of the first slot 131a along the second direction D2. The length of the second slot 121a along the second direction D2 is approximately equal to the length of the radiation layer 12 along the second direction D2. The orthographic projections of the second slots 121a and 121b on the dielectric substrate 10 may both be rectangles. However, this embodiment does not limit this.

[0054] In some exemplary embodiments, as Figure 1A shown, the two second slots 121a and 121b divide the radiation layer 12 into a first radiation part 12a, a second radiation part 12b and a third radiation part 12c. The second slot 121a is located between the first radiation part 12a and the second radiation part 12b, and the second slot 121b is located between the second radiation part 12b and the third radiation part 12c. In this example, the first radiation part 12a, the second radiation part 12b and the third radiation part 12c may all be rectangles. However, this embodiment does not limit this.

[0055] In some exemplary embodiments, as Figure 1A shown, the orthographic projection of the second slot 121a on the dielectric substrate 10 is located on the side closer to the central axis OO' of the orthographic projection of the first slot 131a on the dielectric substrate 10, and the orthographic projection of the second slot 121b on the dielectric substrate 10 is located on the side closer to the central axis OO' of the orthographic projection of the first slot 131b on the dielectric substrate 10.

[0056] In the present exemplary embodiment, by introducing two first slots 131a and 131b that are symmetric about the central axis OO' in the ground layer 13, a radiation null can be introduced at high frequencies; by introducing two second slots 121a and 121b that are symmetric about the central axis OO' in the radiation layer 12, a radiation null can be introduced at low frequencies, thereby realizing the filtering characteristics of the antenna.

[0057] In some exemplary embodiments, as Figure 1A and Figure 1B shown, the first radiation portion 12a of the radiation layer 12 is connected to the ground layer 13 through a first shorting post 141a, and the third radiation portion 12c is connected to the ground layer 13 through a second shorting post 141b. The orthographic projections of the first shorting post 141a and the second shorting post 141b on the dielectric substrate 10 may be circular. However, this embodiment is not limited thereto. In some examples, the orthographic projection of the first shorting post 141a on the dielectric substrate 10 is located on the side of the orthographic projection of the first slot 131a on the dielectric substrate 10 away from the central axis OO', and the orthographic projection of the second shorting post 141b on the dielectric substrate 10 is located on the side of the orthographic projection of the first slot 131b on the dielectric substrate 10 away from the central axis OO'. The first shorting post 141a and the second shorting post 141b are symmetric about the central axis OO'. The first shorting post 141a is adjacent to the first slot 131a, and the second shorting post 141b is adjacent to the second slot 131b. In this exemplary embodiment, by introducing two symmetric shorting posts outside the first slot, the out-of-band rejection characteristic of the passband can be improved.

[0058] In some exemplary embodiments, as Figure 1A shown, the antenna structure has a central axis QQ' in the second direction D2. The radiation layer 12 is symmetric about the central axis QQ', the ground layer 13 is symmetric about the central axis QQ', and the first shorting post 141a and the second shorting post 141b may be located on the central axis QQ'. However, this embodiment is not limited thereto.

[0059] In some exemplary embodiments, as Figure 1A and Figure 1BAs shown, the second radiation part 12b of the radiation layer 12 is connected to the inner conductor 20a of the coaxial conductive column 20, and the ground layer 13 is connected to the outer conductor 20b of the coaxial conductive column 20. An insulating layer is provided between the inner conductor 20a and the outer conductor 20b of the coaxial conductive column 20. The orthographic projections of the inner conductor 20a and the outer conductor 20b on the dielectric substrate 10 can be concentric circles, and the radius of the orthographic projection of the outer conductor 20b is greater than the radius of the orthographic projection of the inner conductor 20a. The coaxial conductive column 20 is also connected to a radio frequency connector 21, and the radio frequency connector 21 is configured to connect an external radio frequency signal. The radio frequency connector 21 can be located on the side of the ground layer 13 away from the dielectric substrate 10. The outer conductor 20b of the coaxial conductive column 20 passes through the ground layer 13 from the side of the ground layer 13 away from the radiation layer 12, wherein the outer conductor 20b is connected to the ground layer 13, and the inner conductor 20a passes through the dielectric substrate 10 and is connected to the radiation layer 12. In this example, the orthographic projection of the coaxial conductive column 20 on the dielectric substrate 10 is located on the central axis OO'. The orthographic projection of the coaxial conductive column 20 on the dielectric substrate 10 is located on one side of the central axis QQ'. In this example, a coaxial feeding form is adopted to feed the radiation layer.

[0060] In some exemplary embodiments, the radiation layer 12 and the ground layer 13 can be formed on the dielectric substrate 10 through a circuit board manufacturing process. For example, the materials of the radiation layer 12 and the ground layer 13 can be metal (Cu) or silver (Ag). However, this embodiment is not limited thereto.

[0061] Figure 1C For Figure 1A the simulation result diagram of the S11 curve of the antenna structure shown. Figure 1D For Figure 1A the simulation result diagram of the gain curve of the antenna structure shown. In the present disclosure, the planar size is represented as the first length * the second length, the first length is the length along the first direction D1, and the second length is the length along the second direction D2. The thickness is the length in the direction perpendicular to the plane where the first direction D1 and the second direction D2 are located.

[0062] In some exemplary embodiments, the relative dielectric constant dk / the dielectric loss df of the dielectric substrate 10 is about 3.6 / 0.003, and the thickness of the dielectric substrate 10 is about 1.5 mm. The thicknesses of the radiation layer 12 and the ground layer 13 can be about 17 microns, and the material can be metal (Cu). The center frequency point f of the antenna simulation 0 is about 3 GHz, and the corresponding vacuum wavelength is λ 0 . The overall thickness of the antenna is about 0.015λ 0 .

[0063] In some exemplary embodiments, such as Figure 1AAs shown, the planar size of the dielectric substrate 10 is approximately 55mm * 35mm. The planar size of the radiation layer 12 is approximately 51mm * 20mm. The planar sizes of the two second slits 121a and 121b of the radiation layer 12 are both approximately 0.2mm * 20mm, and the center spacing between the two second slits 121a and 121b in the first direction D1 is approximately 3.2mm. The planar size of the ground layer 13 is approximately 55mm * 35mm. The planar sizes of the two first slits 131a and 131b of the ground layer 13 are both approximately 0.3mm * 22.0mm, and the center spacing between the two first slits 131a and 131b in the first direction D1 is approximately 22.5mm. The radii of the first shorting posts 141a and the second shorting posts 141b are both approximately 0.6mm. The vertical distance from the center of the first shorting post 141a to the edge of the first slit 131a close to the first shorting post 141a is approximately 0.95mm, and the vertical distance from the center of the second shorting post 141b to the edge of the first slit 131b close to the second shorting post 141b is approximately 0.95mm. The radius of the coaxial conductive post 20 is approximately 1.4mm, and the radius of the inner conductor 20a is approximately 0.6mm. The center of the coaxial conductive post 20 is located on the central axis OO'.

[0064] In some exemplary embodiments, as Figure 1C shown, the impedance bandwidth of the antenna structure at -6dB is approximately 3.56GHz to 3.76GHz. As Figure 1D shown, the gain bandwidth of the antenna structure at 0dBi is approximately 3.31GHz to 4.02GHz, where the maximum gain is approximately 7.4dBi, the corresponding resonant frequency point is approximately 3.66GHz, the high and low frequency radiation nulls are 4.49GHz and 2.76GHz respectively, and the out-of-band suppression in the high and low frequency bands is -23dBi and -19dBi respectively.

[0065] Figure 1E(a) to Figure 1E(c) For Figure 1A shown is the surface current vector distribution diagram of the radiation layer of the antenna structure. Among them, Fig. 1E(a) is the surface current vector distribution diagram of the antenna structure at the gain peak point shown in Figure 1A , corresponding to a frequency point of approximately 3.66GHz; Fig. 1E(b) is the surface current vector distribution diagram of the antenna structure at the low frequency radiation null shown in Figure 1A , corresponding to a frequency point of approximately 2.76GHz; Fig. 1E(c) is the surface current vector distribution diagram of the antenna structure at the high frequency radiation null shown in Figure 1A , corresponding to a frequency point of approximately 4.49GHz. As Figure 1E(a) to Figure 1E(c) can be seen, at 2.76GHz, the surface current directions on both sides of the radiation layer of the antenna structure are opposite and cancel each other out, which can form a low frequency radiation null.

[0066] Figure 1F(a) to Figure 1F(c) For Figure 1ASurface current vector distribution diagram of the ground layer of the antenna structure shown. Among them, Fig. 1F(a) is Figure 1A Surface current vector distribution diagram of the antenna structure shown at the gain peak point, and the corresponding frequency point is about 3.66 GHz; Fig. 1F(b) is Figure 1A Surface current vector distribution diagram of the antenna structure shown at the low-frequency radiation zero point, and the corresponding frequency point is about 2.76 GHz; Fig. 1F(c) is Figure 1A Surface current vector distribution diagram of the antenna structure shown at the high-frequency radiation zero point, and the corresponding frequency point is about 4.49 GHz. As Figure 1F(a) to Figure 1F(c) can be seen, at 4.49 GHz, the surface current directions on both sides of the ground layer of the antenna structure are opposite and cancel each other out, which can form a high-frequency radiation zero point.

[0067] In this exemplary embodiment, the gain bandwidth of the antenna structure at 0 dBi can fully cover the n78 band, and the antenna has good out-of-band rejection characteristics and a low profile, which can meet the requirements of mobile terminal devices for antenna thinness and lightness.

[0068] Figure 2A Another planar schematic diagram of the antenna structure according to at least one embodiment of the present disclosure. Figure 2B is Figure 2A Simulation result diagram of the S11 curve of the antenna structure shown. Figure 2C is Figure 2A Simulation result diagram of the gain curve of the antenna structure shown.

[0069] In some exemplary embodiments, as Figure 2A shown, the number of the first shorting posts 141a and the second shorting posts 141b is three each. The three first shorting posts 141a are arranged in sequence along the second direction D2, and the three second shorting posts 141b are arranged in sequence along the second direction D2. The three first shorting posts 141a and the three second shorting posts 141b have the same size. The three first shorting posts 141a and the three second shorting posts 141b are symmetric about the central axis OO', the three first shorting posts 141a are symmetric about the central axis QQ', and the three second shorting posts 141b are symmetric about the central axis OO'. In some examples, the radius of the first shorting post 141a is about 0.2 mm, and the center-to-center distance between adjacent first shorting posts is about 1.0 mm to 3.0 mm, for example, 1.0 mm. The perpendicular distance between the center of the first shorting post 141a and the edge of the first slot 131a close to the first shorting post 141a is about 0.5 mm to 2.4 mm, for example, 0.5 mm. The number of the first shorting posts and the second shorting posts in this example is not limited. For the rest of the structure and parameters of the antenna structure of this embodiment, reference can be made to Figure 1A the description of the antenna structure shown, so it will not be repeated here.

[0070] In some exemplary embodiments, asFigure 2B As shown, the impedance bandwidth of the antenna structure at -6 dB is approximately 3.58 GHz to 3.78 GHz. As Figure 2C shown, the gain bandwidth of the antenna structure at 0 dBi is approximately 3.33 GHz to 4.05 GHz. Among them, the maximum gain is approximately 7.5 dBi, and the corresponding resonance frequency point is approximately 3.69 GHz. The high and low frequency radiation null points are 4.53 GHz and 2.77 GHz respectively, and the out-of-band suppression of the high and low frequency bands is -25 dBi and -18 dBi respectively. In this exemplary embodiment, the gain bandwidth of the antenna structure at 0 dBi completely covers the n78 band, and the overall out-of-band suppression characteristic of the antenna is good, and the profile is low, which can meet the requirements of mobile terminal devices for antenna thinness.

[0071] Figure 3A This is another schematic plan view of the antenna structure according to at least one embodiment of the present disclosure. Figure 3B is Figure 3A the simulation result diagram of the S11 curve of the antenna structure shown. Figure 3C is Figure 3A the simulation result diagram of the gain curve of the antenna structure shown.

[0072] In some exemplary embodiments, as Figure 3A shown, in the second direction D2, the first ends of the two second slits 121a and 121b of the radiation layer 12 are connected and flush with the edge of the radiation layer 12, and the first ends are far from the coaxial conductive post. The second slit 121a of the radiation layer 12 includes a first extension portion 1211, a second extension portion 1212, and a third extension portion 1213 connected in sequence. The second slit 121b includes a first extension portion 1221, a second extension portion 1222, and a third extension portion 1213 connected in sequence. The first extension portion 1211 of the second slit 121a and the first extension portion 1221 of the second slit 121b are symmetric about the central axis OO', the second extension portion 1212 of the second slit 121a and the second extension portion 1222 of the second slit 121b are symmetric about the central axis OO', and the third extension portions 1213 of the second slit 121a and the second slit 121b coincide and are located on the central axis OO'. The first extension portions 1211 and 1221 extend along the second direction D2, the second extension portions 1212 and 1222 extend along the first direction D1, and the third extension portion 1213 extends along the second direction D2. In this example, after the two second slits 121a and 121b are connected, they form an inverted Y shape. In some examples, the planar sizes of the first extension portions 1211 and 1221 are approximately 0.2 mm * 19.0 mm, the planar sizes of the second extension portions 1212 and 1222 are approximately 1.60 mm * 0.2 mm, and the planar size of the third extension portion 1213 is approximately 0.2 mm * 1.0 mm. For the remaining structures and parameters of the antenna structure of this embodiment, reference can be made to Figure 1AA description of the antenna structure shown is thus not elaborated herein.

[0073] In some exemplary embodiments, such as Figure 3B shown, the impedance bandwidth of the antenna structure at -6 dB is approximately 3.56 GHz to 3.72 GHz. As Figure 3C shown, the gain bandwidth of the antenna structure at 0 dBi is approximately 3.33 GHz to 3.98 GHz, where the maximum gain is approximately 7.2 dBi, its corresponding resonance frequency is approximately 3.65 GHz, the high and low frequency radiation null points are 4.53 GHz and 2.77 GHz respectively, and the high and low frequency out-of-band suppression are -21 dBi and -18 dBi respectively. In this exemplary embodiment, the gain bandwidth of the antenna structure at 0 dBi completely covers the n78 band, and the overall out-of-band suppression characteristic of the antenna is good, with a low profile, which can meet the requirements of mobile terminal devices for antenna thinness and lightness. In this example, the second length of the first extension portion between 16 mm and 19 mm has no obvious effect on the antenna performance.

[0074] Figure 4A This is a schematic structural diagram of the antenna structure of at least one embodiment of the present disclosure. Figure 4B For Figure 4A shown, it is a simulation result diagram of the S11 curve of the antenna structure. Figure 4C For Figure 4A shown, it is a simulation result diagram of the gain curve of the antenna structure.

[0075] In some exemplary embodiments, such as Figure 4AAs shown, in the second direction D2, the first ends of the two second slits 121a and 121b of the radiation layer 12 are connected, and the second ends are also connected, and both the first end and the second end are flush with the edge of the radiation layer 12. The second slits 121a and 121b are symmetric about the central axis OO', the second slit 121a is symmetric about the central axis QQ', and the second slit 121b is symmetric about the central axis QQ'. The second slit 121a includes a third extension portion 1213, a second extension portion 1212, a first extension portion 1211, a fourth extension portion 1214, and a fifth extension portion 1215 connected in sequence; the second slit 121b includes a third extension portion 1213, a second extension portion 1222, a first extension portion 1221, a fourth extension portion 1224, and a fifth extension portion 1215 connected in sequence. The third extension portions 1213 of the two second slits 121a and 121b coincide and are located on the central axis OO', and the fifth extension portions 1215 of the two second slits 121a and 121b coincide and are located on the central axis OO'. The first extension portion 1211 of the first slit 121a and the first extension portion 1221 of the second slit 121b are symmetric about the central axis OO', the second extension portion 1212 of the first slit 121a and the second extension portion 1222 of the second slit 121b are symmetric about the central axis OO', and the fourth extension portion 1214 of the first slit 121a and the fourth extension portion 1224 of the second slit 121b are symmetric about the central axis OO'. The first extension portions 1211 and 1221 extend along the second direction D2, the second extension portions 1212 and 1222, and the fourth extension portions 1214 and 1224 extend along the first direction D1, and the third extension portion 1213 and the fifth extension portion 1215 extend along the second direction D2. In some examples, the planar dimensions of the first extension portions 1211 and 1221 are approximately 0.2 mm * 18.0 mm; the planar dimensions of the second extension portions 1212 and 1222, and the fourth extension portions 1214 and 1224 are approximately 0.2 mm * 1.6 mm; the planar dimensions of the third extension portion 1213 and the fifth extension portion 1215 are approximately 0.2 mm * 1.0 mm. For the remaining structures and parameters of the antenna structure of this embodiment, reference can be made to Figure 1A the description of the antenna structure shown, so it will not be elaborated here.

[0076] In some exemplary embodiments, as Figure 4B shown, the impedance bandwidth of the antenna structure at -6 dB is approximately 3.56 GHz to 3.71 GHz. As Figure 4CAs shown, the gain bandwidth of the antenna structure at 0 dBi is approximately from 3.33 GHz to 3.96 GHz. Among them, the maximum gain is approximately 7.10 dBi, and its corresponding resonant frequency point is approximately 3.64 GHz. The high and low frequency radiation null points are at 4.56 GHz and 2.75 GHz respectively, and the out-of-band suppression in the high and low frequency bands are -21 dBi and -18 dBi respectively. In this exemplary embodiment, the gain bandwidth of the antenna structure at 0 dBi completely covers the n78 frequency band, and the overall out-of-band suppression characteristic of the antenna is good, and the profile is low, which can meet the requirements of mobile terminal devices for antenna thinness and lightness. In this example, the second length of the first extension portion between 16 mm and 19 mm has no obvious influence on the antenna performance.

[0077] The antenna structure provided by this exemplary embodiment has the advantages of simple structure and low profile. By designing the planar structure, the surface current distribution of the radiation layer and the ground layer is changed, thereby realizing the filtering function.

[0078] Figure 5 It is a schematic diagram of an electronic device according to at least one embodiment of the present disclosure. As Figure 5 shown, this embodiment provides an electronic device 91, including: an antenna structure 910. The electronic device 91 can be: a mobile phone, a navigation device, a game console, a television (TV), a car audio, a tablet computer, a personal multimedia player (PMP), a personal digital assistant (PDA), or any product or component with a communication function. However, this embodiment is not limited thereto.

[0079] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures can refer to the general design. Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0080] Those of ordinary skill in the art should understand that the technical solutions of the present disclosure can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present disclosure, and all of them should be covered by the scope of the claims of the present disclosure.

Claims

1. An antenna structure, comprising: a dielectric substrate, a ground layer and a radiation layer located on opposite sides of the dielectric substrate; the ground layer has two first slots, and the two first slots are symmetric about the central axis of the antenna structure in a first direction to introduce a radiation null; the radiation layer has two second slots, the two second slots are symmetric about the central axis, and in a second direction, the edges of the two second slots are aligned with the edge of the radiation layer to introduce another radiation null; the second direction is perpendicular to the first direction; the antenna structure further comprises: at least one first shorting post and at least one second shorting post, the first shorting post and the second shorting post connect the ground layer and the radiation layer; the first shorting post and the second shorting post are symmetric about the central axis; the orthographic projections of the first shorting post and the second shorting post on the dielectric substrate are located on a side of the orthographic projection of the first slot on the dielectric substrate away from the central axis.

2. The antenna structure according to claim 1, wherein, the orthographic projection of the second slot on the dielectric substrate is located on a side of the orthographic projection of the first slot on the dielectric substrate close to the central axis.

3. The antenna structure according to claim 1 or 2, wherein, the two first slots and the two second slots both extend along the second direction, and the length of the first slot along the second direction is greater than the length of the second slot along the second direction.

4. The antenna structure according to claim 1, wherein, the number of the first shorting posts and the second shorting posts is three each.

5. The antenna structure according to claim 1, wherein, the ground layer is connected to the outer conductor of the coaxial conductive post, and the radiation layer is connected to the inner conductor of the coaxial conductive post; the orthographic projection of the coaxial conductive post on the dielectric substrate is located between the orthographic projections of the two second slots on the dielectric substrate.

6. The antenna structure according to claim 5, wherein, the coaxial conductive post is connected to a radio frequency connector, and the radio frequency connector is located on a side of the ground layer away from the dielectric substrate.

7. The antenna structure according to claim 1, wherein, in the second direction, the first ends of the two second slots are connected and flush with the edge of the radiation layer.

8. The antenna structure according to claim 1, wherein, in the second direction, the first ends of the two second slots are connected and flush with the edge of the radiation layer, and the second ends of the two second slots are also connected and flush with the edge of the radiation layer; the first end and the second end are located on opposite sides of the central axis of the antenna structure in the second direction.

9. An electronic device comprising the antenna structure according to any one of claims 1 to 8.

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