Microstrip patch antenna and communication device

Abstract

A microstrip patch antenna and a communication device. The microstrip patch antenna comprises a dielectric plate, a microstrip dipole, a feed line, a first ground plate and a second ground plate. The microstrip dipole, the feed line, the first ground plate and the second ground plate are located on the same surface of the dielectric plate, and the feed line is connected to the microstrip dipole; the first ground plate, the second ground plate and the feed line are located on the same side of the microstrip dipole, and in the extension direction perpendicular to the feed line, the first ground plate and the second ground plate are located on two sides of the feed line; the first ground plate is block-shaped, and the second ground plate is provided with a slot.

Description

Microstrip patch antenna and communication equipment Technical Field

[0001] The present disclosure relates to the field of thin film communication technology, and in particular to a microstrip patch antenna and a communication device. Background Art

[0002] Microstrip patch antennas have the advantages of low profile, simple structure, light weight and easy processing. They have obvious application advantages in scenarios such as mobile phone antennas, automotive electronics, Bluetooth modules and WLAN.

[0003] The inherent defect of traditional microstrip antennas is their narrow bandwidth. However, with the demand for large capacity in modern communications, the characteristics of antennas must also be multi-band and ultra-wideband.

[0004] In view of this, how to make microstrip patch antennas have ultra-wideband and multi-band has become a technical problem that needs to be solved urgently.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a microstrip patch antenna and a communication device to solve the above-mentioned technical problems existing in the prior art.

[0007] In a first aspect, to solve the above technical problems, the present disclosure provides a microstrip patch antenna, comprising:

[0008] A dielectric plate, a microstrip dipole, a feed line, and a first ground plate and a second ground plate;

[0009] The microstrip dipole, the feed line, and the first and second ground plates are located on the same surface of the dielectric plate, and the feed line is connected to the microstrip dipole; the first and second ground plates are located on the same side of the microstrip dipole as the feed line, and in a direction perpendicular to the extension of the feed line, the first and second ground plates are located on both sides of the feed line;

[0010] The first ground plate is block-shaped, and the second ground plate has a slit groove.

[0011] In a possible implementation manner, the slit is located on a side of the second ground plate close to the microstrip dipole, so that the side of the second ground plate close to the microstrip dipole is disconnected by the slit.

[0012] In a possible implementation manner, the second grounding plate is in a comb-teeth shape.

[0013] In a possible implementation manner, the slit groove is located in the second grounding plate, so that the second grounding plate is in a closed shape.

[0014] In a possible implementation manner, in a direction perpendicular to the extension direction of the slit, a width of a remaining portion of the second ground plate located on both sides of the slit is less than or equal to 1 mm.

[0015] In one possible implementation manner, the microstrip patch antenna further includes:

[0016] At least one first resonant ring is located on the same surface of the dielectric plate where the microstrip dipole is provided; the first resonant ring has an opening, and the opening is close to the first ground plate or the second ground plate;

[0017] In an extension direction perpendicular to the feed line, the at least one first resonant ring is located on at least one side of the microstrip dipole.

[0018] In a possible implementation manner, in an extension direction perpendicular to the feed line, a length of the opening is greater than or equal to 1 / 3 times a length of a corresponding inner side of the first resonant ring.

[0019] In a possible implementation manner, the first resonant ring and the microstrip dipole are designed as a connected body.

[0020] In a possible implementation manner, the width of the first resonant ring is greater than or equal to 1 mm.

[0021] In a possible implementation manner, the width of the first resonant ring ranges from 1 to 5 mm.

[0022] In a possible implementation manner, in the extension direction of the feeder, the distance between the opening and the center line of the first resonant ring is 5 to 10 mm.

[0023] In one possible implementation manner, the microstrip patch antenna further includes:

[0024] The second resonant ring and the second transverse branch are both located on a side of the dielectric plate away from the microstrip dipole; the second resonant ring is a closed figure, and the orthographic projections of the microstrip dipole, the feed line, the first ground plate, and the second ground plate on the plane where the second resonant ring is located are all located within the second resonant ring, and the feed line, the first ground plate, and the second ground plate all overlap with the same side of the second resonant ring, and the side of the microstrip dipole away from the first ground plate overlaps with the other side of the second resonant ring;

[0025] The second transverse branch extends from the inner side of the second resonant ring along the extension direction of the opening and is located inside the second resonant ring; the second transverse branch is the same size as the first transverse branch corresponding to the opening in the first resonant ring, and the first transverse branch and the second transverse branch do not overlap and are located on the same side inside the second resonant ring.

[0026] In a possible implementation manner, in an extension direction of the second transverse branch, a length of the second transverse branch is 1 / 2 times the length of a corresponding inner side of the first resonant ring.

[0027] In a possible implementation manner, in a direction perpendicular to the extension of the feeder, the two ground plates have the same length.

[0028] In a possible implementation manner, in an extension direction perpendicular to the feeder line, the first ground plate and the second ground plate have different lengths.

[0029] In a possible implementation manner, in a direction perpendicular to the extension of the feed line, the width of the microstrip dipole ranges from 8 to 13 mm.

[0030] In a second aspect, an embodiment of the present disclosure provides a communication device, comprising the microstrip patch antenna as shown in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of a microstrip patch antenna in the related art;

[0032] FIG2 is a simulation diagram of the reflection coefficient of the microstrip patch antenna corresponding to FIG1 ;

[0033] FIG3 is a schematic structural diagram of a microstrip patch antenna provided by an embodiment of the present disclosure;

[0034] FIG4 is a schematic structural diagram of another microstrip patch antenna provided by an embodiment of the present disclosure;

[0035] FIG5 is a simulation diagram of the reflection coefficient of a microstrip antenna patch provided by an embodiment of the present disclosure;

[0036] 6-8 are schematic structural diagrams of another second grounding plate provided in an embodiment of the present disclosure;

[0037] 9-11 are schematic diagrams of the shape of a slit groove provided in an embodiment of the present disclosure;

[0038] FIG12 is a schematic diagram showing the dimensions of a slit groove in a second ground plate according to an embodiment of the present disclosure;

[0039] FIG13 is a schematic diagram showing the dimensions of a microstrip patch antenna according to an embodiment of the present disclosure;

[0040] FIG14 is a schematic structural diagram of another microstrip antenna provided in an embodiment of the present disclosure;

[0041] 15 and 16 are schematic structural diagrams of another microstrip patch antenna provided in an embodiment of the present disclosure;

[0042] 17 and 18 are simulation diagrams of the reflection coefficient of a microstrip patch antenna provided by an embodiment of the present disclosure;

[0043] FIG19 is a schematic diagram of the length of the opening in the first resonant ring provided by an embodiment of the present disclosure;

[0044] FIG20 is a schematic structural diagram of another microstrip patch antenna provided in an embodiment of the present disclosure;

[0045] FIG21 is a schematic structural diagram of another microstrip patch antenna provided in an embodiment of the present disclosure;

[0046] FIG22 is a schematic structural diagram of another microstrip patch antenna provided in an embodiment of the present disclosure;

[0047] FIG23 is a simulation diagram of the reflection coefficient of the microstrip patch antenna corresponding to FIG22 provided in an embodiment of the present disclosure;

[0048] FIG24 is a simulation diagram of the reflection coefficient of the microstrip patch antenna corresponding to FIG21 provided in an embodiment of the present disclosure;

[0049] FIG25 is a schematic diagram showing the dimensions of a microstrip patch antenna provided by an embodiment of the present disclosure;

[0050] FIG26 is a simulation diagram of the reflection coefficient of a microstrip patch antenna provided by an embodiment of the present disclosure;

[0051] FIG27 is a bottom view of another microstrip patch antenna provided in an embodiment of the present disclosure;

[0052] FIG28 is a top view of another microstrip patch antenna provided in an embodiment of the present disclosure;

[0053] FIG29 is a 3dB axial ratio simulation diagram of the microstrip patch antenna corresponding to FIG23 provided by an embodiment of the present disclosure;

[0054] FIG30 is a 3dB axial ratio simulation diagram of the microstrip patch antenna corresponding to FIG27 provided by an embodiment of the present disclosure;

[0055] 31 and 32 are top views of another microstrip patch antenna provided by an embodiment of the present disclosure;

[0056] 33 and 34 are top views of another microstrip patch antenna provided in an embodiment of the present disclosure.

[0057] Reference numerals: dielectric plate 1 , microstrip dipole 2 , feed line 3 , first ground plate 4 , second ground plate 5 , slot f, first resonant ring 6 , opening K, second resonant ring 7 , second transverse branch 71 , first transverse branch 61 . DETAILED DESCRIPTION

[0058] The embodiments of the present disclosure provide a microstrip patch antenna and a communication device to solve the above-mentioned technical problems existing in the prior art.

[0059] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present disclosure more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present disclosure are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of the present disclosure. The drawings of the present disclosure are only used to illustrate relative position relationships and do not represent true proportions.

[0060] It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in a variety of ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below. The subsequent description of the specification is a preferred embodiment of the present disclosure, but the description is for the purpose of illustrating the general principles of the present disclosure and is not intended to limit the scope of the present disclosure. The scope of protection of the present disclosure shall be as defined by the appended claims.

[0061] Please refer to FIG1 which is a schematic structural diagram of a microstrip patch antenna in related art.

[0062] Microstrip patch antenna, including:

[0063] A dielectric plate 1, a microstrip dipole 2, a feed line 3, a first ground plate 4 and a second ground plate 5;

[0064] The microstrip dipole 2, feed line 3, first ground plate 4 and second ground plate 5 are located on the same surface of the dielectric plate 1. The feed line 3 is connected to the microstrip dipole 2. The first ground plate 4 and the second ground plate 5 are both block-shaped.

[0065] Please refer to Figure 2 for a simulation diagram of the reflection coefficient of the microstrip patch antenna corresponding to Figure 1. It can be seen from Figure 2 that when the reflection coefficient is <-10dB, the microstrip patch antenna corresponding to Figure 1 only forms effective resonance in the narrow band range of 1.79-2.5GHz, which makes the microstrip patch antenna only have one frequency band available, and the bandwidth of the available frequency band is narrow, which greatly limits the potential use of the microstrip patch antenna.

[0066] To solve the above problems, the embodiments of the present disclosure provide a microstrip patch antenna and a communication device, which are described in detail below with reference to the accompanying drawings.

[0067] FIG3 is a schematic structural diagram of a microstrip patch antenna according to an embodiment of the present disclosure. The microstrip patch antenna includes:

[0068] A dielectric plate 1, a microstrip dipole 2, a feed line 3, a first ground plate 4 and a second ground plate 5;

[0069] The microstrip dipole 2, feed line 3, first ground plate 4, and second ground plate 5 are located on the same surface of the dielectric plate 1, and the feed line 3 is connected to the microstrip dipole 2. The first ground plate 4 and second ground plate 5 are located on the same side of the microstrip dipole 2 as the feed line 3, and in the extension direction Y (i.e., the X direction) perpendicular to the feed line 3, the first ground plate 4 and second ground plate 5 are located on both sides of the feed line 3.

[0070] The first ground plate 4 is block-shaped, and the second ground plate 5 has a slit groove f.

[0071] The positions of the first ground plate 4 and the second ground plate 5 can be interchanged. As shown in Figure 1, the second ground plate 5 may include multiple slit slots f, or there may be only one slit slot f, as shown in Figure 4, which is a structural schematic diagram of another microstrip patch antenna provided in an embodiment of the present disclosure.

[0072] Please refer to Figure 5 for a reflection coefficient simulation diagram of a microstrip antenna patch provided in an embodiment of the present disclosure. Figure 5 is a reflection coefficient simulation diagram of the microstrip patch antenna corresponding to Figure 4. It can be seen from Figure 5 that after the slit slot f is set on the second ground plane 5, when the reflection coefficient is <-10dB, the microstrip patch antenna corresponding to Figure 4 forms effective resonance in the two frequency bands of 1.383 to 2.724 GHz and 3.891 to 4.322 GHz. Compared with the microstrip patch antenna corresponding to Figure 1 in the related art, one frequency band (3.891 to 4.322 GHz) has been added, and the frequency band in the low frequency range (1.383 to 2.724 GHz) has increased by more than 20% compared to the frequency band in the low frequency range (1.79-2.5 GHz) in Figure 1, achieving an ultra-wideband design.

[0073] In the embodiment provided in the present disclosure, by setting the first ground plane 4 of the microstrip patch antenna to a block shape and setting a slit slot f in the second ground plane 5, not only the bandwidth can be effectively widened, but also the effective frequency band can be increased, thereby realizing the ultra-wideband and multi-band design of the microstrip patch antenna.

[0074] 3 and 4 , the slit f is located on a side of the second ground plate 5 close to the microstrip dipole 2 , so that the side of the second ground plate 5 close to the microstrip dipole 2 is disconnected by the slit f.

[0075] In the embodiment provided in the present disclosure, by setting a slit groove f that disconnects the corresponding edge of the second ground plate 5 on the side of the second ground plate 5 close to the microstrip dipole 2, it is convenient to widen the magnetic field distribution around the microstrip dipole 2, thereby effectively widening the bandwidth and adding more effective frequency bands.

[0076] As shown in FIG. 3 , the second ground plate 5 may be in a comb-teeth shape.

[0077] Please refer to Figures 6 to 8 for structural schematic diagrams of another second grounding plate provided in an embodiment of the present disclosure.

[0078] The slit groove f is located in the second grounding plate 5, so that the second grounding plate 5 is in a closed shape.

[0079] As shown in FIG6 , the second grounding plate 5 can have a single slit slot f located within the second grounding plate 5, forming a closed, annular shape. As shown in FIG7 and FIG8 , the second grounding plate 5 can have multiple slit slots f, all located within the second grounding plate 5, forming a closed shape. As shown in FIG6 and FIG7 , the slit slot f can extend in the same direction as the extension direction Y of the feeder line 3. As shown in FIG8 , the slit slot f can also extend in a direction that intersects the extension direction Y of the feeder line 3. This is not particularly limited.

[0080] The shape of the slit groove f can be a rectangle or a figure composed of at least two intersecting rectangles, as shown in Figures 9 to 11.

[0081] In the embodiment provided by the present disclosure, by setting the slit groove f in the second ground plate 5, the second ground plate 5 is made into a closed shape, which facilitates widening the magnetic field distribution around the microstrip dipole 2, thereby effectively widening the bandwidth and adding more effective frequency bands.

[0082] 12 is a schematic diagram of the dimensions of the slit in a second grounding plate according to an embodiment of the present disclosure. In the extension direction m perpendicular to the slit f, the width W1 of the remaining portion of the second grounding plate 5 on both sides of the slit f is less than or equal to 1 mm.

[0083] Please refer to Figure 13 for a schematic diagram of the dimensions of a microstrip patch antenna according to an embodiment of the present disclosure. Please refer to Table 1 for the dimensions of the various components of the microstrip patch antenna.

[0084] Table 1

[0085] In the embodiment provided in the present disclosure, by setting the width W1 of the remaining part of the body of the second ground plate 5 located on both sides of the slit slot f to less than or equal to 1 mm in the extension direction m perpendicular to the slit slot f, the bandwidth can be effectively widened and more effective frequency bands can be added.

[0086] Please refer to Figure 14 for a schematic diagram of the structure of another microstrip antenna provided by an embodiment of the present disclosure. The microstrip patch antenna also includes:

[0087] At least one first resonant ring 6 is located on the same surface of the dielectric plate 1 as the microstrip dipole 2; the first resonant ring 6 has an opening K, and the opening K is close to the first ground plate 4 or the second ground plate 5;

[0088] In an extension direction Y perpendicular to the feed line 3 , at least one first resonant ring 6 is located on at least one side of the microstrip dipole 2 .

[0089] As shown in FIG14 , a microstrip patch antenna may include a first resonant ring 6 on one side of a microstrip dipole 2. Alternatively, as shown in FIG15 , multiple first resonant rings 6 may be provided on one side of a microstrip dipole 2. Alternatively, as shown in FIG16 , a first resonant ring 6 may be provided on each side of the microstrip dipole 2. FIG15 and FIG16 are schematic structural diagrams of another microstrip patch antenna provided in an embodiment of the present disclosure.

[0090] Please refer to Figures 17 and 18 for simulation diagrams of the reflection coefficient of a microstrip patch antenna provided in an embodiment of the present disclosure. Figure 17 is a simulation diagram of the microstrip patch antenna corresponding to Figure 14, and Figure 18 is a simulation diagram of the microstrip patch antenna corresponding to Figure 16.

[0091] It can be seen from Figures 17 and 18 that when at least one first resonant ring 6 as described above is set in the microstrip patch antenna, the microstrip patch antenna in Figure 17 forms effective resonance in the three frequency bands of 1.109 to 1.371 GHz, 2.008 to 2.723 GHz, and 3.853 to 4.184 GHz, and the microstrip patch antenna in Figure 18 forms effective resonance in the three frequency bands of 1.041 to 1.406 GHz, 2.227 to 2.739 GHz, and 3.481 to 4.374 GHz. Compared with the microstrip patch antenna in Figure 3 which does not have the first resonant ring 6, they both increase one effective frequency band. Therefore, by setting at least one first resonant ring 6 in the microstrip patch antenna, the effective frequency band of the microstrip patch antenna can be effectively increased.

[0092] Please compare the frequency band ranges of the effective frequency bands in the same frequency ranges in Figure 17 and Figure 18. For example, the frequency range of the effective frequency band in the low frequency range in Figure 17 is 1.109~1.371GHz, and the frequency range of the effective frequency band in the low frequency range in Figure 18 is 1.041~1.406GHz. The frequency range of the effective frequency band in the low frequency range in Figure 18 is larger than the frequency range of the effective frequency band in the low frequency range in Figure 17; the frequency range of the effective frequency band in the intermediate frequency range in Figure 17 is 2.008~2.723GHz, and the frequency range of the effective frequency band in the intermediate frequency range in Figure 18 is 2.227~2.739GHz. The frequency range of the effective frequency band in the intermediate frequency range in Figure 18 is also larger than the frequency range of the effective frequency band in the intermediate frequency range in Figure 17; the frequency range of the effective frequency band in the high frequency range in Figure 17 is 3.853~4.184GHz GHz, the effective frequency band in the high frequency range of FIG18 is 3.481 to 4.374 GHz. The frequency range of the effective frequency band in the high frequency range of FIG18 is also larger than the frequency range of the effective frequency band in the high frequency range of FIG17. Therefore, increasing the number of first resonant rings 6 in the microstrip patch antenna can further broaden the bandwidth of the effective frequency band.

[0093] In the embodiment provided in the present disclosure, at least one first resonant ring 6 is provided in the microstrip patch antenna, wherein the first resonant ring 6 is provided in the same layer as the microstrip dipole 2, and the first resonant ring 6 has an opening K, and the opening K is close to the first ground plate 4 or the second ground plate 5; in the extension direction Y perpendicular to the feed line 3, at least one first resonant ring 6 is located on at least one side of the microstrip dipole 2; the number of effective frequency bands of the microstrip patch antenna can be effectively increased; in addition, increasing the number of first resonant rings 6 can further widen the bandwidth of the effective frequency band.

[0094] Please refer to Figure 19 for a schematic diagram of the length of the opening in the first resonant ring provided in an embodiment of the present disclosure.

[0095] In the extension direction Y perpendicular to the feed line 3 , the length L1 of the opening K is greater than or equal to 1 / 3 of the length L2 of the corresponding inner side of the first resonant ring 6 .

[0096] As shown in FIG20 , which is a schematic structural diagram of another microstrip patch antenna provided in an embodiment of the present disclosure, the length L1 of the opening K may also be equal to the length L2 of the corresponding inner side of the first resonant ring 6 .

[0097] 21 is a schematic structural diagram of another microstrip patch antenna provided by an embodiment of the present disclosure. In this microstrip patch antenna, the first resonant ring 6 and the microstrip dipole 2 are designed as a conjoined whole.

[0098] Please refer to Figure 22 for a structural schematic diagram of another microstrip patch antenna provided in an embodiment of the present disclosure. In Figure 22, the first ground plate 4 and the second ground plate 5 are both set to block shape, and the first resonant ring 6 and the microstrip dipole 2 are set to a connected design. In this way, it can be seen that the first resonant ring 6 affects the bandwidth of the microstrip patch antenna. As shown in Figure 23, there is a reflection coefficient simulation diagram of the microstrip patch antenna corresponding to Figure 22 provided in an embodiment of the present disclosure. It can be seen from Figure 23 that the frequency range of the microstrip patch antenna at -10dB is 2.007~3.622GHz, compared with the frequency range of 1.788~2.501 corresponding to Figure 1, which can effectively widen the bandwidth of the microstrip patch antenna.

[0099] Please refer to Figure 24 for a reflection coefficient simulation diagram of the microstrip patch antenna corresponding to Figure 21 provided in an embodiment of the present disclosure. It can be seen from Figure 24 that after a slit f is set on the second ground plate 5 and the first resonant ring 6 and the microstrip dipole 2 are set as a connected structure, the frequency range of the -10dB microstrip patch antenna is 1.757~4.262GHz, which is improved compared with the frequency range of the microstrip patch antenna corresponding to Figures 22 and 14. In combination with the reflection coefficient simulation diagram corresponding to Figure 14 (Figure 18), it can be seen that in the microstrip patch antenna corresponding to the second ground plate 5 with the slit f, the first resonant unit and the microstrip dipole 2 are connected, so that adjacent resonant points (i.e., frequency bands) can be overlapped to form a wide band.

[0100] In addition, by comparing FIG. 23 with FIG. 24 , it can be seen that providing the slit slot f on the second ground plate 5 will seriously affect the high-frequency resonance characteristics, and the slit slot f will significantly increase the working bandwidth of the high-frequency band.

[0101] Please refer to Figure 25 for a schematic diagram of the dimensions of a microstrip patch antenna provided in an embodiment of the present disclosure.

[0102] In some embodiments, the width d2 of the first resonant ring 6 is greater than or equal to 1 mm.

[0103] In other embodiments, the width d2 of the first resonant ring 6 ranges from 1 to 5 mm.

[0104] In the extension direction Y of the feed line 3 , the distance d3 between the opening K and the center line OO′ of the first resonant ring 6 ranges from 5 to 10 mm.

[0105] Please refer to Figure 26 for a reflection coefficient simulation diagram of a microstrip patch antenna provided in an embodiment of the present disclosure. The width d2 of the first resonant ring 6 in the microstrip patch antenna corresponding to Figure 26 is 1 mm, and in the extension direction Y of the feed line 3, the distance d3 between the opening K and the center line OO' of the first resonant ring 6 is 6 mm. The width d2 of the first resonant ring 6 in the microstrip patch antenna corresponding to Figure 24 is 3 mm, and the frequency range is less than -10 dB, which is 1.59 to 4.11 GHz. Compared with the frequency range of less than -10 dB in Figure 24, which is 1.757 to 4.262 GHz, the frequency band is widened. Therefore, by changing the width d2 of the first resonant ring 6, the frequency band width can be effectively adjusted. Setting the width d2 of the first resonant ring 6 to 1 to 5 mm can form an effective broadband characteristic.

[0106] In FIG25 , the width w3 of the microstrip dipole 2 is 3 mm. Typically, the width w3 of the microstrip dipole 2 ranges from 8 to 13 mm.

[0107] Please refer to Figures 27 and 28. Figure 27 is a bottom view of another microstrip patch antenna provided in an embodiment of the present disclosure, and Figure 28 is a top view of another microstrip patch antenna provided in an embodiment of the present disclosure. The microstrip patch antenna further includes:

[0108] As shown in FIG27 , the second resonant ring 7 and the second transverse branch 71 are both located on the side of the dielectric plate 1 away from the microstrip dipole 2. The second resonant ring 7 is a closed figure. As shown in FIG28 , the orthographic projections of the microstrip dipole 2, the feed line 3, the first ground plate 4, and the second ground plate 5 on the plane where the second resonant ring 7 is located are all located within the second resonant ring 7. The feed line 3, the first ground plate 4, and the second ground plate 5 all overlap with the same side of the second resonant ring 7, and the side of the microstrip dipole 2 away from the first ground plate 4 overlaps with the other side of the second resonant ring 7.

[0109] The second transverse branch 71 extends from the inner side of the second resonant ring 7 along the extension direction of the opening K and is located inside the second resonant ring 7; the second transverse branch 71 is the same size as the first transverse branch 61 corresponding to the opening K in the first resonant ring 6, and the first transverse branch 61 and the second transverse branch 71 do not overlap and are located on the same side inside the second resonant ring 7.

[0110] The second transverse branch 71 and the first transverse branch 61 can be located on the left side of the second resonant ring 7 as shown in FIG26 ; they can also be located on the right side of the second resonant ring 7. In this case, the first resonant ring 6 is located on the right side of the microstrip dipole 2. By arranging the first transverse branch 61 and the second transverse branch 71 on the same side of the second resonant ring 7 without overlapping, the microstrip patch antenna can achieve an effective resonance effect.

[0111] It should be noted that, for ease of observation, FIG27 is a top view after removing the dielectric plate 1 in the microstrip patch antenna.

[0112] Please refer to Figure 29 for a 3dB axial ratio simulation diagram of the microstrip patch antenna corresponding to Figure 23 provided in an embodiment of the present disclosure. It can be seen from Figure 29 that the axial ratio bandwidth of the microstrip patch antenna without the second resonant ring 7 and the second lateral branch 71 is 1.22-1.7GHz.

[0113] Please refer to FIG30 for a 3dB axial ratio simulation diagram of the microstrip patch antenna corresponding to FIG27 provided in an embodiment of the present disclosure. As can be seen from FIG30, the axial ratio bandwidth of the microstrip patch antenna having the second resonant ring 7 and the second transverse branch 71 is 2.24-2.43GHz and 2.61-2.95GHz. It can be seen that by providing the second resonant ring 7 and the second transverse branch 71 on the side of the dielectric plate 1 away from the microstrip dipole 2 in the microstrip patch antenna, the circular polarization working bandwidth and frequency of the microstrip patch antenna can be effectively regulated, thereby enhancing the anti-interference and transceiver stability of the microstrip patch antenna in actual application scenarios, such as signal scattering, multipath fading and other interference factors existing in the actual environment.

[0114] In addition, by regulating and optimizing the sizes of the second resonant ring 7 and the second transverse branch 71 , the circular polarization operating frequency band and operating frequency point can be flexibly regulated, thereby realizing the control design of circular polarization.

[0115] In the embodiment provided in the present disclosure, by providing a second resonant ring 7 with a closed pattern on the side of the dielectric plate 1 away from the microstrip dipole 2, and a second transverse branch 71 extending from the second resonant ring 7 toward the opening K, and making the second transverse branch 71 and the first transverse branch 61 the same size, both located on the same side of the second resonant ring 7, and the second transverse branch 71 and the first transverse branch 61 have no overlap, the circularly polarized working bandwidth and frequency of the microstrip patch antenna can be effectively controlled, thereby enhancing the anti-interference and transceiver stability of the microstrip patch antenna in actual application scenarios.

[0116] Continuing to refer to FIG. 29 , in the extension direction of the second transverse branch 71 , the length L3 of the second transverse branch 71 is 1 / 2 times the length L2 of the corresponding inner side of the first resonant ring 6 .

[0117] Please refer to Figures 31 and 32 for top views of another microstrip patch antenna provided by an embodiment of the present disclosure. In the extension direction Y perpendicular to the feed line 3, the lengths of the first ground plate 4 and the second ground plate 5 are the same (ie, w2 = w2').

[0118] In the embodiments provided herein, by setting the lengths of the first ground plane 4 and the first ground plane 4 to be the same in a microstrip patch antenna having a second resonant ring 7 and a second transverse branch 71 in a direction perpendicular to the extension of the feed line 3, the impedance matching of the microstrip patch antenna can be flexibly adjusted, so that as much energy as possible is fed into the microstrip dipole 2 for radiation, thereby ensuring that the microstrip patch antenna has excellent operating efficiency. In addition, the design freedom of the resonant matching second transverse branch 71 can be increased, which facilitates more flexible adjustment of the resonant frequency and operating bandwidth of the microstrip patch antenna while maintaining a simple structure and reducing processing costs and process difficulty.

[0119] 33 and 34 are top views of another microstrip patch antenna according to an embodiment of the present disclosure. In the extension direction Y perpendicular to the feed line 3, the first ground plate 4 and the second ground plate 5 have different lengths (ie, w2≠w2').

[0120] In the embodiment provided in the present disclosure, by setting the lengths of the first ground plate 4 and the first ground plate 4 to be different in the extension direction Y perpendicular to the feed line 3 in a microstrip patch antenna having a second resonant ring 7 and a second lateral branch 71, the design space of the microstrip dipole 2 and the first resonant ring 6 can be increased, so that the size of the radiation patch and the resonant branch can be designed with maximum freedom, thereby increasing the control freedom of the microstrip dipole 2 and the first lateral branch 61, ensuring the maximum adjustment of the resonant frequency and bandwidth. At the same time, its structure is still relatively simple, and the process and processing costs are low. Through reasonable design, there is an obvious advantage of further reducing the overall size of the antenna unit.

[0121] Based on the same inventive concept, an embodiment of the present disclosure provides a communication device, which includes the microstrip patch antenna as described above.

[0122] The upper microstrip patch antenna can be an antenna in a mobile phone, an antenna in a car, an antenna in a Bluetooth module, or an antenna in wireless communication. Therefore, the above-mentioned communication devices can be mobile phones, cars, Bluetooth devices, wireless routers, etc.

[0123] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0124] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A microstrip patch antenna, wherein, include: A dielectric plate, a microstrip dipole, a feed line, and a first ground plate and a second ground plate; The microstrip dipole, the feed line, and the first ground plate and the second ground plate are located on the same surface of the dielectric plate, and the feed line is connected to the microstrip dipole; the first ground plate and the second ground plate are located on the same side of the microstrip dipole as the feed line, and in a direction perpendicular to the extension of the feed line, the first ground plate and the second ground plate are located on both sides of the feed line; The first grounding plate is block-shaped, and the second grounding plate has a slit groove.

2. The microstrip patch antenna according to claim 1, wherein, The slit groove is located at a side of the second ground plate close to the microstrip dipole, so that the side of the second ground plate close to the microstrip dipole is disconnected by the slit groove.

3. The microstrip patch antenna according to claim 2, wherein, The second grounding plate is in a comb-teeth shape.

4. The microstrip patch antenna as described in claim 1, wherein the slit groove is located in the second ground plate, so that the second ground plate is a closed shape.

5. The microstrip patch antenna according to any one of claims 1-4, wherein, In the extending direction perpendicular to the slit groove, the width of the remaining part of the body of the second grounding plate located on both sides of the slit groove is less than or equal to 1 mm.

6. The microstrip patch antenna according to any one of claims 1-5, wherein, The microstrip patch antenna also includes: At least one first resonant ring is located on the same surface of the dielectric plate where the microstrip dipole is arranged; the first resonant ring has an opening, and the opening is close to the first ground plate or the second ground plate; In an extension direction perpendicular to the feed line, the at least one first resonant ring is located on at least one side of the microstrip dipole.

7. The microstrip patch antenna according to claim 6, wherein, In an extension direction perpendicular to the feed line, a length of the opening is greater than or equal to 1 / 3 times a length of a corresponding inner side of the first resonant ring.

8. The microstrip patch antenna according to claim 6 or 7, wherein, The first resonant ring and the microstrip dipole are designed as a connected body.

9. The microstrip patch antenna according to claim 8, wherein, The width of the first resonant ring is greater than or equal to 1 mm.

10. The microstrip patch antenna according to claim 9, wherein, The width of the first resonant ring ranges from 1 to 5 mm.

11. The microstrip patch antenna according to any one of claims 8-10, wherein, In the extension direction of the feed line, the distance between the opening and the center line of the first resonant ring is 5 to 10 mm.

12. The microstrip patch antenna according to any one of claims 8-11, wherein, The microstrip patch antenna also includes: The second resonant ring and the second transverse branch are both located on a side of the dielectric plate away from the microstrip dipole; the second resonant ring is a closed figure, and the orthographic projections of the microstrip dipole, the feeder, the first ground plate and the second ground plate on the plane where the second resonant ring is located are all located within the second resonant ring, and the feeder, the first ground plate and the second ground plate all overlap with the same side of the second resonant ring, and the side of the microstrip dipole away from the first ground plate overlaps with the other side of the second resonant ring; The second transverse branch extends from the inner side of the second resonant ring along the extension direction of the opening and is located in the second resonant ring; the second transverse branch is the same size as the first transverse branch corresponding to the opening in the first resonant ring, and the first transverse branch does not overlap with the second transverse branch and is located on the same side in the second resonant ring.

13. The microstrip patch antenna according to claim 12, wherein, In the extension direction of the second transverse branch, the length of the second transverse branch is 1 / 2 times the length of the corresponding inner side of the first resonant ring.

14. The microstrip patch antenna according to claim 12 or 13, wherein, In a direction perpendicular to the extension of the feeder line, the two ground plates have the same length.

15. The microstrip patch antenna according to claim 12 or 13, wherein, In a direction perpendicular to the extending direction of the feeder, the lengths of the first ground plane and the second ground plane are different.

16. The microstrip patch antenna according to any one of claims 1-15, wherein, In a direction perpendicular to the extending direction of the feeder, the width of the microstrip dipole ranges from 8 to 13 mm.

17. A communication device, wherein, Comprising the microstrip patch antenna according to any one of claims 1-16.

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