Microstrip antenna and electronic device

Abstract

An embodiment of the present invention provides a microstrip antenna and an electronic device. The microstrip antenna includes a first substrate, a radiating patch, and a matching structure, wherein the radiating patch and the matching structure are electrically connected through the first substrate. The matching structure is composed of two sections of a spiral first transmission line and a second transmission line, each of which is configured as an equal or unequal impedance matching branch, so that the microstrip antenna forms a dual resonance to widen the bandwidth. The embodiment of the present invention adds a matching structure of a transmission line with equal or unequal impedance matching branches to the existing microstrip antenna structure, so that the matching structure and the radiating patch form a dual resonance without increasing the original microstrip antenna substrate size, without opening a slit in the antenna shape, and without adding a parasitic antenna, thereby changing the narrowband impedance characteristics of the microstrip antenna into a broadband impedance characteristic with a wider frequency band.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a microstrip antenna and electronic equipment. Background Art

[0002] With the development of communication technology, high-performance and miniaturized RF front-end products have become a new development trend. Microstrip antennas based on dielectric substrates are widely used in various communication equipment due to their smaller size.

[0003] A microstrip antenna primarily consists of a radiating patch, a dielectric substrate, an antenna ground structure, and an antenna feed structure. The radiating patch is made of metal and has varying shapes and performance. The dielectric substrate, which supports the radiating patch, is constructed by laminating a single or multiple layers of dielectric substrate. The antenna ground structure is made of metal and can be attached to the dielectric substrate or the device's metal housing. Antenna feed structures include coaxial feed, microstrip feed, and coupled feed. However, in any single-patch antenna design, the impedance bandwidth at the feed point is relatively narrow. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a microstrip antenna and an electronic device, wherein the microstrip antenna has a larger bandwidth without increasing the external dimensions.

[0005] In a first aspect, an embodiment of the present invention provides a microstrip antenna, comprising:

[0006] a first substrate;

[0007] a radiation patch, arranged on one side of the first substrate;

[0008] a matching structure, disposed on the other side of the first substrate, the matching structure being electrically connected to the radiation patch;

[0009] Wherein, the matching structure includes:

[0010] A first transmission line is a first impedance matching branch, and the first transmission line is spiral;

[0011] The second transmission line is a second impedance matching branch. The impedances of the first impedance matching branch and the second impedance matching branch are equal or different. The second transmission line is spiral and is electrically connected to the first transmission line through an electrical connection point.

[0012] Furthermore, the first transmission line and the second transmission line are different in at least one of length, cross-sectional area, and terminal connection mode.

[0013] Furthermore, the first transmission line terminal is open-circuited.

[0014] Furthermore, the second transmission line terminal is grounded.

[0015] Furthermore, the first substrate is provided with a first substrate feeding hole, one end of the first substrate feeding hole is electrically connected to the radiation patch, and the other end of the first substrate feeding hole is electrically connected to the first transmission line or the second transmission line.

[0016] Furthermore, the electrical connection point is a starting point of a spiral line of the first transmission line and the second transmission line.

[0017] Furthermore, the first transmission line and the second transmission line are spirally wound on the first substrate in the same direction, and the first transmission line and the second transmission line are spaced apart.

[0018] Furthermore, the curve equations of the spiral structures of the first transmission line and the second transmission line are:

[0019]

[0020] Wherein, a is the distance between the first transmission line and the second transmission line, and θ is the polar angle value.

[0021] Furthermore, the microstrip antenna further includes:

[0022] a second substrate, comprising a first surface on which the matching structure is provided, the second substrate being arranged parallel to the first substrate;

[0023] A ground pattern is provided on the second surface of the second substrate, and the ground pattern is electrically connected to the matching structure.

[0024] Furthermore, the second substrate defines a second substrate feeding hole, one end of the second substrate feeding hole is electrically connected to the ground pattern, and the other end of the second substrate feeding hole is electrically connected to the first transmission line or the second transmission line.

[0025] Furthermore, a conductive hole is provided on the second substrate, one end of the conductive hole is electrically connected to the ground pattern, and the other end of the conductive hole is electrically connected to the first transmission line and / or the second transmission line.

[0026] Furthermore, the microstrip antenna further comprises a coaxial line, wherein the coaxial line comprises an outer conductor and an inner conductor;

[0027] wherein the outer conductor is electrically connected to the first transmission line, and the inner conductor is electrically connected to the second transmission line;

[0028] Alternatively, the outer conductor is electrically connected to the second transmission line, and the inner conductor is electrically connected to the first transmission line.

[0029] In a second aspect, an embodiment of the present invention provides an electronic device, comprising the microstrip antenna as described in the first aspect.

[0030] An embodiment of the present invention provides a microstrip antenna and an electronic device. The microstrip antenna includes a first substrate, a radiating patch, and a matching structure connected in sequence. The matching structure includes two sections of a first spiral transmission line and a second spiral transmission line, each configured as a branch with equal or unequal impedance matching. The embodiment of the present invention adds a matching structure of a transmission line with equal or unequal impedance matching branches to the existing microstrip antenna structure. Without increasing the external dimensions of the original single-patch antenna substrate, without creating a slit in the antenna shape, and without adding a parasitic antenna, the matching structure and the radiating patch together form a dual resonance, thereby changing the narrowband impedance characteristics of the microstrip antenna into broadband impedance characteristics with a wider frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0032] Figure 1 is an exploded schematic diagram of a microstrip antenna according to an embodiment of the present invention;

[0033] Figure 2 is a bottom view of a microstrip antenna according to an embodiment of the present invention;

[0034] Figure 3 is an exploded schematic diagram of another microstrip antenna with a ground pattern according to an embodiment of the present invention;

[0035] Figure 4 is a top view of another microstrip antenna with a ground pattern according to an embodiment of the present invention;

[0036] Figure 5 is a cross-sectional view along the AA direction of another microstrip antenna with a ground pattern according to an embodiment of the present invention;

[0037] Figure 6 is a schematic diagram of the three-dimensional structure of another microstrip antenna according to an embodiment of the present invention;

[0038] Figure 7 This is the simulation result diagram of the existing microstrip antenna scattering parameters;

[0039] Figure 8 This is a diagram showing simulation results of scattering parameters of a microstrip antenna according to an embodiment of the present invention;

[0040] Figure 9 is the Smith impedance diagram of the existing microstrip antenna;

[0041] Figure 10is a Smith impedance chart of a microstrip antenna according to an embodiment of the present invention;

[0042] Figure 11 This is the simulation result diagram of the radiation efficiency parameters of the existing microstrip antenna;

[0043] Figure 12 This is a diagram showing the simulation results of the radiation efficiency parameters of the microstrip antenna according to an embodiment of the present invention;

[0044] Figure 13 FIG. 4 is a top view of the matching structure according to an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 1-first substrate; 11-first substrate feeding hole; 111-ground pad; 2-radiating patch; 3-matching structure; 31-first transmission line; 311-electrical connection point; 32-second transmission line; 4-second substrate; 41-second substrate feeding hole; 42-conductive hole; 5-ground pattern; 51-feed pad; 6-coaxial line; 61-outer conductor; 62-inner conductor. DETAILED DESCRIPTION

[0047] The present invention is described below based on the following embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, certain specific details are described in detail. Those skilled in the art can fully understand the present invention without these details. To avoid obscuring the essence of the present invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0048] Furthermore, persons of ordinary skill in the art will appreciate that the figures provided herein are for illustration purposes only and are not necessarily drawn to scale.

[0049] At the same time, it should be understood that in the following description, "circuit" refers to a conductive loop composed of at least one element or subcircuit connected electrically or electromagnetically. When an element or circuit is said to be "connected to" another element or an element / circuit is said to be "connected" between two nodes, it can be directly coupled or connected to the other element or there can be intermediate elements. The connection between the elements can be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there are no intermediate elements between the two.

[0050] Unless the context clearly requires otherwise, words like "include", "comprising" and the like in the specification should be interpreted as including rather than exclusive or exhaustive; that is, as "including but not limited to".

[0051] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0052] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0053] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0054] Figure 1 It is an exploded schematic diagram of the microstrip antenna of an embodiment of the present invention, and the microstrip antenna includes: a first substrate 1, a radiation patch 2 and a matching structure 3. The radiation patch 2 is a conventional rectangular metal patch. Specifically, the radiation patch 2 is a rectangular copper foil. The radiation patch 2 is formed by covering the surface of the first substrate 1 through PCB board manufacturing processes such as lamination, etching or spraying. The radiation patch 2 and the matching structure 3 are respectively arranged on both sides of the first substrate 1, and the radiation patch 2 and the matching structure 3 are electrically connected. Among them, the matching structure 3 includes a first transmission line 31 and a second transmission line 32. The matching structure 3 is made of metal. In the embodiment of the present invention, in order to simplify the manufacturing process, the matching structure 3 is made of the same copper foil as the radiation patch 2. As shown Figure 1 As shown, the first transmission line 31 and the second transmission line 32 are both planar, spiral transmission lines. The first transmission line 31 and the second transmission line 32 are electrically connected, with the connection point being electrical connection point 311. The first transmission line 31 is a first impedance matching branch, and the second transmission line 32 is a second impedance matching branch. The impedances of the first impedance matching branch and the second impedance matching branch are equal or unequal. The first transmission line 31 and the second transmission line 32 affect the input impedance of the radiating patch 2, thereby forming a dual resonance between the matching structure 3 and the radiating patch 2, thereby broadening the frequency band of the entire microstrip antenna.

[0055] Specifically, the first transmission line 31 and the second transmission line 32 are different in at least one of length, cross-sectional area, and terminal connection mode, so that the matching structure 3 and the radiation patch 2 together form a double resonance to broaden the frequency band of the microstrip antenna.

[0056] In one embodiment, the first transmission line 31 and the second transmission line 32 have different lengths, so that the resistance, capacitance, charge and other values ​​of the first transmission line 31 and the second transmission line 32 are different, thereby forming a dual resonance with the matching structure 3 and the radiation patch 2.

[0057] In another embodiment, the first transmission line 31 and the second transmission line 32 have different line widths, so that the resistance, capacitance, charge and other values ​​of the first transmission line 31 and the second transmission line 32 are different, thereby the matching structure 3 and the radiation patch 2 jointly form a dual resonance.

[0058] In one embodiment, the first transmission line 31 and the second transmission line 32 have different lengths and line widths, so that the matching structure 3 and the radiation patch 2 form a dual resonance.

[0059] In addition, the first transmission line 31 and the second transmission line 32 are made of different materials, so that the matching structure 3 and the radiation patch 2 form a double resonance.

[0060] Figure 13 It is a top view of the matching structure of an embodiment of the present invention. In this embodiment, the starting points of the first transmission line 31 and the second transmission line 32 are staggered with each other, so that a lower precision processing method can be used for processing, effectively reducing production costs.

[0061] In this embodiment, the first transmission line 31 is fed at one end and is not connected to any metal, i.e., the terminal is open-circuited. The second transmission line 32 is fed at one end and grounded at the terminal to form a short-circuit structure. The matching structure 3 achieves simple and easy-to-implement open-circuit and short-circuit structures by configuring the terminal structures of the first and second transmission lines 31, 32. The radiating patch 2, electrically connected to the matching structure 3, which has both open-circuit and short-circuit structures, achieves dual resonance within a single microstrip antenna, thereby increasing the bandwidth of the microstrip antenna.

[0062] Figure 2 This is a bottom view of the microstrip antenna according to an embodiment of the present invention. The first transmission line 31 and the second transmission line 32 are two-dimensionally wound around the first substrate 1. The first transmission line 31 and the second transmission line 32 are electrically connected via the electrical connection point 311. The electrical connection point 311 is the starting point of the spirals of the first transmission line 31 and the second transmission line 32. The first transmission line 31 and the second transmission line 32 are wound around each other on the first substrate 1 from the electrical connection point 311 without overlapping each other.

[0063] Furthermore, the first transmission line 31 and the second transmission line 32 both conform to the shape of an Archimedean spiral, so that the matching structure 3 has a better impedance characteristic.

[0064] In this embodiment, the curve equations of the spiral structures of the first transmission line 31 and the second transmission line 32 are:

[0065]

[0066] Where a is the distance between the first transmission line 31 and the second transmission line 32, and θ is the polar angle. In this embodiment, a is the shortest radial distance between the starting points of the spiral structures of the first and second transmission lines 31 and 32, i.e., the diameter of the electrical connection point 311. Whether the two spiral segments are the same or different in length is determined by the actual impedance of the microstrip antenna. Simulation experiments show that a microstrip antenna that conforms to this curve equation has a wide bandwidth.

[0067] Furthermore, the impedance curve of the microstrip antenna can be adjusted by adjusting the arc length of the helix of the first transmission line 31 or the second transmission line 32 in the matching structure 3, thereby expanding the frequency band of the microstrip antenna.

[0068] like Figure 1 As shown, the first substrate 1 is provided with a first substrate feed hole 11. The position of the first substrate feed hole 11 can be determined based on the impedance of the microstrip antenna. One end of the first substrate feed hole 11 is electrically connected to the radiating patch 2, and the other end of the first substrate feed hole 11 is electrically connected to the electrical connection point 311. Since the first transmission line 31 and the second transmission line 32 are electrically connected, the first substrate feed hole 11 can also be electrically connected to any position of the first transmission line 31 or the second transmission line 32, providing great flexibility in the location of the first substrate feed hole 11.

[0069] Figure 3 This is an exploded schematic diagram of another microstrip antenna with a ground pattern according to an embodiment of the present invention. The microstrip antenna also includes a second substrate 4 and the ground pattern 5. The ground pattern 5 is copper foil or other metal sheet. In some embodiments, the ground pattern 5 may be the metal housing of the microstrip antenna mounting device. The second substrate 4 is arranged parallel to the first substrate 1. One side of the second substrate 4 is in contact with the matching structure 3. The ground pattern 5 is located on the other side of the second substrate 4 and passes through the second substrate 4 to electrically connect to the matching structure 3. Figure 4It is a top view of another microstrip antenna with a ground pattern according to an embodiment of the present invention. The first substrate 1, the radiation patch 2 and the matching structure 3 of the microstrip antenna are arranged the same as those in the above-mentioned embodiment of the present invention. Figure 5 This is a cross-sectional view along the AA direction of another microstrip antenna with a ground pattern according to an embodiment of the present invention. A second substrate feed hole 41 and a conductive hole 42 are provided on the second substrate 4. The second substrate feed hole 41 penetrates the second substrate 4 and electrically connects the ground pattern 5 and the matching structure 3. The connection point between the second substrate feed hole 41 and the matching structure 3 can be set on the first transmission line 31, the second transmission line 32, or the electrical connection point 311. The impedance curve of the microstrip antenna can be adjusted by adjusting the electrical connection position between the second substrate feed hole 41 and the matching structure 3 to achieve the effect of expanding the frequency band of the microstrip antenna. The position of the second substrate feed hole 41 is independent of the position of the first substrate feed hole 11; the two can be staggered or interpenetrating. The location can be determined based on actual processing and usage requirements. A feeding pad 51 corresponding to the position of the second substrate feed hole 41 is provided on the ground pattern 5 to feed the microstrip antenna.

[0070] In this embodiment, the conductive via 42 penetrates the second substrate 4 and electrically connects the ground pattern 5 and the matching structure 3. The connection point between the second substrate feeding via 41 and the matching structure 3 is set according to the position of the short-circuit structure in the matching structure 3, and the conductive via 42 is connected to the transmission line configured to have the short-circuit structure.

[0071] In some embodiments, when the matching structure 3 does not include a short-circuited transmission line, the second substrate 4 does not include the conductive hole 42 , or the first transmission line 31 and the second transmission line 32 are both arranged to avoid the conductive hole 42 .

[0072] The microstrip antenna can be fed via a coaxial line. Figure 6 As shown, the coaxial line 6 includes an outer conductor 61 and an inner conductor 62. The outer conductor 61 and the inner conductor 62 are connected to the ground and the signal line respectively. In this embodiment, the outer conductor 61 is grounded and the inner conductor 62 is connected to the signal line, so that the matching structure 3 has a short-circuit and open-circuit structure while feeding. Figure 8 As shown, the outer conductor 61 is electrically connected to the second transmission line 32 , and the inner conductor 62 is electrically connected to the first transmission line 31 .

[0073] In some embodiments, the outer conductor 61 is electrically connected to the first transmission line 31, and the inner conductor 62 is electrically connected to the second transmission line 32. The specific connection method between the coaxial line 6 and the transmission line can also be selected based on actual conditions. By adjusting the connection position between the conductor in the coaxial line 6 (the outer conductor 61 or the inner conductor 62) and the transmission line, the impedance curve can be adjusted, thereby expanding the operating frequency band of the microstrip antenna. In another embodiment, the microstrip antenna can also be fed using microstrip feeding or coupled feeding.

[0074] Figure 6 This is a schematic diagram of the three-dimensional structure of another microstrip antenna according to an embodiment of the present invention. The matching structure 3 is provided on the upper surface of the first substrate 1, and the radiating patch 2 is located on the lower surface of the first substrate 1. The first substrate 1 is provided with a first substrate feeding hole 11, and the radiating patch 2 and the matching structure 3 are electrically connected and fed through the first substrate feeding hole 11. A grounding pad 111 is also provided on the upper surface of the first substrate 1, and the grounding pad 111 is electrically connected to the first transmission line 31 which is set as a short-circuit structure. The grounding pad 111 is connected to the ground of the entire mainboard through a metal wire. The microstrip antenna is fed through the coaxial line 6, and the outer conductor 61 and the inner conductor 62 are electrically connected to the second transmission line 32 and the first transmission line 31, respectively. The connection structure of the coaxial line 6 can be changed according to actual needs. This design simplifies the structure of the microstrip antenna and has a wider applicability.

[0075] An embodiment of the present invention further provides an electronic device having the microstrip antenna. Since the microstrip antenna has a larger efficiency bandwidth, the electronic device has more flexible usage scenarios and better usage effects.

[0076] Figure 7 This is the simulation result of the existing microstrip antenna scattering parameters. Figure 8 This is a simulation result diagram of the scattering parameters of the microstrip antenna according to an embodiment of the present invention. Compared with the low bandwidth of existing microstrip antennas, the microstrip antenna according to the embodiment of the present invention can expand the scattering parameter bandwidth from 460MHz to 790MHz at -3dB, an increase of about 70%, without increasing the antenna's external dimensions. Here, the antenna bandwidth is defined as the difference between the upper and lower limits of the frequency when the scattering parameter is -3dB. Due to the matching structure 3, the curve of the microstrip antenna according to the embodiment of the present invention has two downward-concave points. As a result, the matching structure 3 improves the impedance characteristics of the microstrip antenna input point, so that it produces another well-matched frequency point near the resonant frequency of the existing microstrip antenna. This can be understood as the microstrip antenna producing two resonant points. When the two resonant points are close, the operating frequency band of the microstrip antenna increases.

[0077] Figure 9 is the Smith impedance diagram of the existing microstrip antenna, Figure 10 FIG. 4 is a Smith impedance chart of the microstrip antenna according to an embodiment of the present invention. Figure 9 is the impedance distribution curve at the feed pad of the existing microstrip antenna, Figure 10 The impedance distribution curve at the feed pad 51 of the microstrip antenna according to the embodiment of the present invention is shown in FIG. 1 . The closer the curve is to the center point, the better the antenna scattering parameters are. The more curve points are close to the center point, the wider the antenna frequency band is. Figure 9 and Figure 10 Comparison shows that the microstrip antenna provided by the embodiment of the present invention has better scattering parameters and a wider frequency band than existing microstrip antennas. Furthermore, the impedance curve can be adjusted by adjusting the arc lengths of the first and second transmission lines 31 and 32 in the matching structure 3, as well as the positional relationship between the second substrate feed hole 41 and the transmission lines, thereby expanding the operating frequency band of the microstrip antenna.

[0078] Figure 11 This is the simulation result diagram of the radiation efficiency parameters of the existing microstrip antenna. Figure 12 This is a diagram showing the simulation results of the radiation efficiency parameters of the microstrip antenna according to an embodiment of the present invention. Figure 11 and Figure 12 It can be seen from the comparison that, compared with the existing single patch antenna, the single antenna efficiency bandwidth of the matching structure 3 of the microstrip antenna according to the embodiment of the present invention is improved to a certain extent.

[0079] An embodiment of the present invention discloses a microstrip antenna and an electronic device, wherein the microstrip antenna includes a first substrate 1, a radiating patch 2, and a matching structure 3, wherein the radiating patch 2 and the matching structure 3 are electrically connected through the first substrate 1. The matching structure 3 includes two sections of a spiral first transmission line 31 and a second transmission line 32, each configured as a branch with equal or unequal impedance matching, so that the microstrip antenna forms a dual resonance to broaden the bandwidth. The embodiment of the present invention adds the matching structure 3 of a transmission line with equal or unequal impedance matching branches to the existing microstrip antenna structure, thereby enabling the matching structure 3 and the radiating patch 2 to form a dual resonance without increasing the external dimensions of the original single-patch antenna substrate, without creating a slit in the antenna shape, and without adding a parasitic antenna. This allows the narrowband impedance characteristics of the microstrip antenna to be transformed into broadband impedance characteristics, thus having a wider frequency band.

[0080] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A microstrip antenna, characterized in that: The microstrip antenna comprises: a first substrate (1); A radiation patch (2) is arranged on one side of the first substrate (1); A matching structure (3) is arranged on the other side of the first substrate (1), and the matching structure (3) is electrically connected to the radiation patch (2); Wherein, the matching structure (3) includes: A first transmission line (31) is a first impedance matching branch, and the first transmission line (31) is spiral-shaped; The second transmission line (32) is a second impedance matching branch, the impedances of the first impedance matching branch and the second impedance matching branch are different, the second transmission line (32) is spiral, and the second transmission line (32) is electrically connected to the first transmission line (31) via an electrical connection point (311); The first transmission line (31) and the second transmission line (32) are different in at least one of length, cross-sectional area or terminal connection mode, so that the impedance of the first impedance matching branch is different from that of the second impedance matching branch; The electrical connection point (311) is the starting point of the spiral lines of the first transmission line (31) and the second transmission line (32).

2. The microstrip antenna according to claim 1, wherein: The first transmission line (31) is open-circuited at its terminal end.

3. The microstrip antenna according to claim 1, wherein: The second transmission line (32) is terminated at a ground terminal.

4. The microstrip antenna according to claim 1, wherein: The first substrate (1) is provided with a first substrate feeding hole (11), one end of the first substrate feeding hole (11) is electrically connected to the radiation patch (2), and the other end of the first substrate feeding hole (11) is electrically connected to the first transmission line (31) or the second transmission line (32).

5. The microstrip antenna according to claim 1, wherein: The first transmission line (31) and the second transmission line (32) are spirally wound on the first substrate (1) in the same direction, and the first transmission line (31) and the second transmission line (32) are spaced apart.

6. The microstrip antenna according to claim 1, wherein: The curve equations of the spiral structures of the first transmission line (31) and the second transmission line (32) are: Wherein, a is the distance between the first transmission line (31) and the second transmission line (32), and θ is the polar angle value.

7. The microstrip antenna according to claim 1, wherein: The microstrip antenna further comprises: a second substrate (4), comprising a first surface on which the matching structure (3) is arranged, the second substrate (4) being arranged parallel to the first substrate (1); A grounding pattern (5) is provided on the second surface of the second substrate (4), and the grounding pattern (5) is electrically connected to the matching structure (3).

8. The microstrip antenna according to claim 7, wherein: The second substrate (4) is provided with a second substrate feeding hole (41), one end of the second substrate feeding hole (41) is electrically connected to the ground pattern (5), and the other end of the second substrate feeding hole (41) is electrically connected to the first transmission line (31) or the second transmission line (32).

9. The microstrip antenna according to claim 7, wherein: The second substrate (4) further has a conductive hole (42), one end of the conductive hole (42) is electrically connected to the ground pattern (5), and the other end of the conductive hole (42) is electrically connected to the first transmission line (31) and / or the second transmission line (32).

10. The microstrip antenna according to claim 1, wherein: The microstrip antenna further comprises a coaxial line (6), wherein the coaxial line (6) comprises an outer conductor (61) and an inner conductor (62); wherein the outer conductor (61) is electrically connected to the first transmission line (31), and the inner conductor (62) is electrically connected to the second transmission line (32); Alternatively, the outer conductor (61) is electrically connected to the second transmission line (32), and the inner conductor (62) is electrically connected to the first transmission line (31).

11. An electronic device, characterized in that: The electronic device comprises the microstrip antenna according to any one of claims 1 to 10.

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