Millimeter wave broadband planar antenna

Abstract

The embodiment of the utility model provides a millimeter wave broadband planar antenna. The millimeter wave broadband planar antenna comprises a first metal layer, a dielectric layer and a second metal layer, the dielectric layer is arranged between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer; the first metal layer is composed of a radiator and a feeder line, and the radiator is communicated with the feeder line; the second metal layer can be used as a radio frequency ground of the millimeter wave broadband planar antenna; a first gap and a second gap are formed in the center of the feeder line, and the projections of the first gap and the second gap on the surface of the feeder line are cross-shaped; the radiator, the dielectric layer and the second metal layer are rectangular; the feeder line is octagonal, and the octagon can be formed by cutting four identical triangles at four right-angle positions of a rectangle. The millimeter wave broadband planar antenna has the advantages of miniaturization, high gain and high radiation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of planar antennas, and in particular to a millimeter-wave broadband planar antenna with the advantages of miniaturization, high gain and high radiation efficiency. Background Art

[0002] At present, the application of wireless communication terminals is becoming more and more extensive, which has led to the rapid development of wireless communication technology. Antennas, as the bridge and air interface of wireless communication technology, are bound to be the focus of research.

[0003] Millimeter-wave broadband planar antennas have attracted extensive attention and in-depth research from scholars and engineers in the industry due to their advantages such as high transmission rate, low cost, light weight, simple design, high data transmission rate, and easy integration with other components.

[0004] However, traditional millimeter-wave broadband planar antennas still have the defects of large size, low gain, and low radiation efficiency, which limit their use in modern wireless communication terminals. Utility Model Content

[0005] The millimeter-wave broadband planar antenna provided by the utility model aims to solve at least some of the defects of existing millimeter-wave broadband planar antennas.

[0006] The utility model provides a millimeter wave broadband planar antenna. The millimeter wave broadband planar antenna comprises:

[0007] a first metal layer, a dielectric layer, and a second metal layer; the dielectric layer is disposed between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer;

[0008] The first metal layer is composed of a radiator and a feeder, and the radiator is connected to the feeder; the second metal layer can be used as a radio frequency ground of the millimeter wave broadband planar antenna;

[0009] A first slot and a second slot are provided at the center of the feeder, and projections of the first slot and the second slot on the surface of the feeder are in a cross shape;

[0010] The radiator, the dielectric layer and the second metal layer are all rectangular; the feed line is octagonal, and the octagon can be formed by cutting four identical triangles at four right-angle positions of the rectangle.

[0011] In some embodiments, the feed line has a first side, a second side, a third side, a fourth side, a fifth side, a sixth side, a seventh side, and an eighth side to enclose and form the octagon;

[0012] The first side and the second side, the third side and the fourth side, the fifth side and the sixth side are all symmetrical about the first gap;

[0013] The first side and the third side, the second side and the fourth side, the seventh side and the eighth side are all symmetrical about the second gap.

[0014] In some embodiments, the physical lengths of the first side, the second side, the third side, and the fourth side are equal;

[0015] The fifth side and the sixth side have the same physical length, and the seventh side and the eighth side have the same physical length.

[0016] In some embodiments, the fifth side is located between the first side and the third side, and the sixth side is located between the second side and the fourth side;

[0017] The seventh side is located between the first side and the second side, and the eighth side is located between the third side and the fourth side.

[0018] In some embodiments, the radiator extends from the seventh side along the first direction away from the feed line to an edge of the dielectric layer;

[0019] The first direction is the width direction of the second metal layer and is perpendicular to the seventh side.

[0020] In some embodiments, the radiator has a preset first physical length in the first direction and a preset first physical width in the second direction;

[0021] The second direction is the length direction of the second metal layer, and the first direction and the second direction are orthogonal to each other.

[0022] In some embodiments, the second metal layer has a preset second physical length in the second direction and a preset second physical width in the first direction;

[0023] The dielectric layer has a preset third physical length in the second direction and a preset third physical width in the first direction;

[0024] The second physical length is equal to the third physical length, and the second physical width is smaller than the third physical width.

[0025] In some embodiments, the first slit has a preset first slit length in the first direction and a preset first slit width in the second direction;

[0026] The second slit has a preset second slit length in the second direction and a preset second slit width in the first direction.

[0027] In some embodiments, the first slit length is equal to the second slit length, and the first slit width is equal to the second slit width.

[0028] In some embodiments, the perpendicular bisector of the feed line in the first direction, the perpendicular bisector of the radiator in the first direction, the perpendicular bisector of the second metal layer in the first direction, the perpendicular bisector of the first gap in the first direction, and the perpendicular bisector of the second gap in the first direction coincide with each other.

[0029] At least one beneficial effect of the millimeter-wave broadband planar antenna provided by the embodiment of the present utility model is: the traditional feed line is rectangular, while the present feed line is an octagon formed by cutting four triangles with the same parameters at four right-angle positions of the traditional feed line. Therefore, compared with the traditional rectangular feed line, the present feed line has a smaller size; a first slit and a second slit intersecting in a cross are provided on the present feed line, and the present millimeter-wave broadband planar antenna can obtain a higher gain by reasonably selecting the relevant parameters of the above-mentioned octagon, the relevant parameters of the first slit, the relevant parameters of the second slit, and the relevant parameters of the above-mentioned second metal layer; the present millimeter-wave broadband planar antenna can obtain a higher radiation efficiency by reasonably selecting the relevant parameters of the radiator. In summary, compared with the traditional millimeter-wave broadband planar antenna, the present millimeter-wave broadband planar antenna has the advantages of miniaturization, high gain and high radiation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0031] Figure 1 This is a schematic structural diagram of a millimeter-wave broadband planar antenna provided by an embodiment of the present utility model;

[0032] Figure 2 This is a perspective structural diagram of a millimeter-wave broadband planar antenna provided by an embodiment of the present utility model (the second metal layer is seen through so that the first metal layer and the second metal layer can be revealed at the same time);

[0033] Figure 3This is a front view of the millimeter wave broadband planar antenna provided by an embodiment of the present utility model (the side where the first metal layer is located);

[0034] Figure 4 This is a rear view of the millimeter wave broadband planar antenna provided by an embodiment of the present utility model (the side where the second metal layer is located);

[0035] Figure 5 Schematic diagram of the dielectric layer and the first metal layer provided by an embodiment of the present utility model;

[0036] Figure 6 This is a schematic diagram of the dielectric layer and the second metal layer provided in an embodiment of the present utility model;

[0037] Figure 7 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different L G (L G refers to the simulation result diagram of the second physical width of the second metal layer);

[0038] Figure 8 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different L T (L T refers to the simulation result diagram under the condition that the physical distance between the end of the fifth side close to the seventh side and the seventh side is ≤ 0.05.

[0039] Figure 9 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different W T (W T refers to the simulation result diagram under the condition that the physical distance between the end of the eighth side close to the fifth side and the fifth side is close to the physical distance between the eighth side and the fifth side;

[0040] Figure 10 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different L C (L C refers to the physical distance between any end of the second gap and the first gap) under the simulation result diagram;

[0041] Figure 11 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different W C (W C refers to the simulation result diagram of the first gap width of the first gap;

[0042] Figure 12 This is a simulation result diagram of the reflection coefficient of the millimeter-wave broadband planar antenna provided by an embodiment of the present utility model;

[0043] Figure 13This is a simulation result diagram of the maximum gain and radiation efficiency of the millimeter-wave broadband planar antenna provided by an embodiment of the present utility model.

[0044] Figure numerals: 100, millimeter wave broadband planar antenna; 1001, first direction; 1002, second direction; 1, first metal layer; 11, radiator; 12, feed line; 121, first side; 122, second side; 123, third side; 124, fourth side; 125, fifth side; 126, sixth side; 127, seventh side; 128, eighth side; 1201, first slot; 1202, second slot; 1203, slot arm; 2, dielectric layer; 3, second metal layer. DETAILED DESCRIPTION

[0045] The present invention is described in detail below with reference to specific embodiments. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope and application of the present invention.

[0046] It should be noted that, unless otherwise expressly specified or limited, the terms "vertical", "first direction", "length direction", "second direction", "width direction", etc. used in this specification to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. Terms such as "install", "connect", "connect", and "fix" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", and "eighth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features; thus, the features specified as "first", "second", "third", "fourth", "fifth", "sixth", "seventh", and "eighth" may explicitly or implicitly include one or more of such features; "multiple" or "several" means two or more; and "and / or" includes any and all combinations of one or more related listed items. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0047] Figure 1 It is a structural schematic diagram of the millimeter wave broadband planar antenna provided by an embodiment of the present utility model. Figure 2This is a perspective structural diagram of the millimeter-wave broadband planar antenna provided by an embodiment of the present utility model (the second metal layer is seen through so that the first metal layer and the second metal layer can be revealed at the same time). Figure 3 It is a front view (the side where the first metal layer is located) of the millimeter wave broadband planar antenna provided by an embodiment of the present utility model. Figure 4 It is a rear view (the side where the second metal layer is located) of the millimeter wave broadband planar antenna provided by an embodiment of the present utility model.

[0048] See also Figures 1-4 The millimeter wave broadband planar antenna 100 includes: a first metal layer 1, a dielectric layer 2 and a second metal layer 3.

[0049] The dielectric layer 2 is disposed between the first metal layer 1 and the second metal layer 3 to limit direct contact between the first metal layer 1 and the second metal layer 3 .

[0050] Specifically, the dielectric layer 2 can serve as an isolation layer, and the isolation layer can form a certain isolation protection between the first metal layer 1 and the second metal layer 3 to prevent direct contact between the first metal layer 1 and the second metal layer 3 and cause a short circuit, thereby effectively ensuring the normal operation of the millimeter wave broadband planar antenna 100; moreover, the dielectric layer 2 can also provide mechanical support. Since the dielectric layer 2 is arranged between the first metal layer 1 and the second metal layer 3, the dielectric layer 2 can enhance the structural strength of the millimeter wave broadband planar antenna 100 to ensure the stability and reliability of the millimeter wave broadband planar antenna 100.

[0051] In addition, the first metal layer 1 is composed of a radiator 11 and a feeder 12, and the radiator 11 is connected to the feeder 12; the second metal layer 3 can serve as the radio frequency ground of the millimeter wave broadband planar antenna 100; generally speaking, the above-mentioned radiator 11 can be composed of a rectangular metal patch.

[0052] In addition, a first slot 1201 and a second slot 1202 are provided at the center of the feed line 12 , and the projections of the first slot 1201 and the second slot 1202 on the surface of the feed line 12 are in a cross shape.

[0053] It should be noted that the characteristic impedance of the radiator 11 can be 50Ω, and the radiator 11 can be used as a microstrip line of the millimeter-wave broadband planar antenna 100; wherein, the radiation performance of the millimeter-wave broadband planar antenna 100 is determined by the relevant parameters of the radiator 11 (for example, the first physical length and the first physical width of the radiator 11); in addition, the bandwidth and the reflection coefficient of the millimeter-wave broadband planar antenna 100 are determined by the relevant parameters of the radio frequency ground (the second metal layer 3) (for example, the second physical width of the second metal layer 3), the relevant parameters of the feed line 12 (for example, the physical distance between the end of the fifth side 125 close to the seventh side 127 and the seventh side 127, the distance between the end of the eighth side 128 close to the fifth side 125 and the fifth side 125). Physical spacing; the traditional feed line is composed of a rectangular radiation patch, and the octagon of the present feed line 12 can be regarded as formed by cutting four identical triangles on the rectangular radiation patch, and the four triangles are respectively located at the four right-angle positions of the rectangle; therefore, the relevant parameters of the present feed line 12 can also be regarded as the size parameters of the right-angled sides of each triangle), the relevant parameters of the first slot 1201 (for example, the physical spacing between any end of the first slot 1201 and the second slot 1202, the first slot width of the first slot 1201), and the relevant parameters of the second slot (for example, the physical spacing between any end of the second slot 1202 and the first slot 1201, the second slot width of the second slot 1202) are jointly determined.

[0054] It can be understood that the radiator 11, the dielectric layer 2 and the second metal layer 3 are all rectangular; the feed line 12 is octagonal, and the octagon can be formed by cutting four identical triangles at four right angles of the rectangle.

[0055] In some embodiments, as Figures 1-4 As shown, the feed line 12 has a first side 121 , a second side 122 , a third side 123 , a fourth side 124 , a fifth side 125 , a sixth side 126 , a seventh side 127 and an eighth side 128 , which enclose and form the aforementioned octagon.

[0056] In the embodiment of the present application, the first side 121 and the second side 122, the third side 123 and the fourth side 124, the fifth side 125 and the sixth side 126 are all symmetrical about the first gap 1201; the first side 121 and the third side 123, the second side 122 and the fourth side 124, the seventh side 127 and the eighth side 128 are all symmetrical about the second gap 1202.

[0057] Figure 5 It is a schematic layout of the dielectric layer and the first metal layer provided in an embodiment of the present utility model. Figure 6 It is a schematic layout of the dielectric layer and the second metal layer provided in an embodiment of the present utility model.

[0058] In some embodiments, reference Figures 1-6 It can be seen that the physical lengths of the first side 121, the second side 122, the third side 123 and the fourth side 124 are equal (that is, the sizes of the four right-angled sides of the triangle parallel to the first direction 1001 are equal, and the sizes of the four right-angled sides of the triangle parallel to the second direction 1002 are also equal).

[0059] In addition, the fifth side 125 and the sixth side 126 have the same physical length, and the seventh side 127 and the eighth side 128 have the same physical length.

[0060] In some embodiments, according to Figures 1-4 It can be seen that the fifth side 125 is located between the first side 121 and the third side 123 , and the sixth side 126 is located between the second side 122 and the fourth side 124 .

[0061] Specifically, the seventh side 127 is located between the first side 121 and the second side 122 , and the eighth side 128 is located between the third side 123 and the fourth side 124 .

[0062] In some embodiments, Figures 1-4 It can be seen that the radiator 11 extends from the seventh side 127 along the first direction 1001 away from the feed line 12 to the edge of the dielectric layer 2 .

[0063] It should be noted that the first direction 1001 is the width direction of the second metal layer 3 and is perpendicular to the seventh side 127 .

[0064] In some embodiments, reference Figures 1-6 It can be seen that the radiator 11 has a preset first physical length in the first direction 1001 and a preset first physical width in the second direction 1002 .

[0065] It can be understood that the second direction 1002 is the length direction of the second metal layer 3 , and the first direction 1001 and the second direction 1002 are orthogonal to each other.

[0066] In some embodiments, please refer to Figures 1-6 The second metal layer 3 has a preset second physical length in the second direction 1002 and a preset second physical width in the first direction 1001 .

[0067] The dielectric layer 2 has a preset third physical length in the second direction 1002 , and has a preset third physical width in the first direction 1001 .

[0068] In addition, the second physical length is equal to the third physical length, and the second physical width is smaller than the third physical width.

[0069] In some embodiments, please refer to Figures 1-6 The first slit 1201 has a preset first slit length in the first direction 1001 and a preset first slit width in the second direction 1002 .

[0070] To further illustrate, the second slit 1202 has a preset second slit length in the second direction 1002 , and has a preset second slit width in the first direction 1001 .

[0071] In some embodiments, combined Figures 1-6 It can be seen that the first gap length is equal to the second gap length, and the first gap width is equal to the second gap width.

[0072] In an embodiment of the present application, after the first slot 1201 and the second slot 1202 cross each other at the center position of the feed line 12, four identical slot arms 1203 are formed; moreover, the physical spacing between any end of the first slot 1201 and the second slot 1202 or the physical spacing between any end of the second slot 1202 and the first slot 1201 is equal to the physical length of each slot arm 1203.

[0073] In some embodiments, as Figures 1-4 As shown, the perpendicular bisector of the feed line 12 in the first direction 1001, the perpendicular bisector of the radiator 11 in the first direction 1001, the perpendicular bisector of the second metal layer 3 in the first direction 1001, the perpendicular bisector of the first slot 1201 in the first direction 1001 and the perpendicular bisector of the second slot 1202 in the first direction 1001 coincide with each other.

[0074] In order to facilitate readers to understand the concept of the present invention and to more thoroughly illustrate the structure proposed by the present invention, a simulation experiment is conducted on the actual millimeter wave broadband planar antenna 100 below.

[0075] Figure 7 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different L G (L G refers to the simulation result diagram under the second physical width of the second metal layer).

[0076] In this simulation, see Figure 5-Figure 6 The dielectric constant of the dielectric layer 2 is 3.38, the dielectric loss of the dielectric layer 2 is 0.0022, and the thickness of the dielectric layer 2 is 0.2 mm; the first metal layer 1 and the second metal layer 3 are both copper-plated, and the thickness of the first metal layer 1 and the second metal layer 3 are both 0.035 mm.

[0077] Figure 7 The reflection coefficient of the millimeter wave broadband planar antenna 100 is shown in FIG. G The simulation results are 3.6mm, 3.8mm and 4.0mm respectively; among them, L G is the second physical width of the second metal layer 3 .

[0078] Depend on Figure 7 It can be seen that as the parameter L G As the reflection coefficient of the millimeter wave broadband planar antenna 100 increases, it first becomes better and then worse, and the passband bandwidth is G =3.8mm is the maximum.

[0079] Figure 8 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different L T (L T It refers to the simulation result diagram under the physical distance between the end of the fifth side close to the seventh side and the seventh side).

[0080] Figure 8 The reflection coefficient of the millimeter wave broadband planar antenna 100 is shown in FIG. T The simulation results are 1.5mm, 2.0mm and 2.5mm respectively; among them, L T It is the physical distance between the end of the fifth side 125 close to the seventh side 127 and the seventh side 127, or the size parameter of the right-angled sides parallel to the first direction 1001 in four identical triangles cut from the four right-angle positions of the rectangle.

[0081] Depend on Figure 8 It can be seen that as the parameter L T The reflection coefficient of the millimeter wave broadband planar antenna 100 becomes better in the frequency range between the first resonance point and the second resonance point; the reflection coefficient of the millimeter wave broadband planar antenna 100 becomes worse in the frequency range between the second resonance point and the third resonance point; and the passband bandwidth is L T = Maximum when 2.0mm.

[0082] Figure 9 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different W T (W T It refers to the simulation result diagram under the condition that the physical distance between the end of the eighth side close to the fifth side and the fifth side.

[0083] Figure 9 The reflection coefficient of the millimeter wave broadband planar antenna 100 is shown in W TThe simulation results are 1.5mm, 2.0mm and 2.5mm respectively; among them, W T It is the physical distance between the end of the eighth side 128 close to the fifth side 125 and the fifth side 125, or the size parameter of the right-angled sides parallel to the second direction 1002 in four identical triangles cut from the four right-angle positions of the rectangle.

[0084] Depend on Figure 9 It can be seen that as the parameter W T As W increases, the reflection coefficient of the millimeter wave broadband planar antenna 100 becomes better, and the lower passband edge moves down slightly, the upper passband edge moves down first and then up, the center frequency becomes slightly smaller, and the bandwidth becomes slightly smaller first and then increases; and W T =2.0mm is the best choice.

[0085] Figure 10 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different L C (L C refers to the physical distance between any end of the second gap and the first gap) under the simulation result diagram.

[0086] Figure 10 The reflection coefficient of the millimeter wave broadband planar antenna 100 is shown in FIG. C The simulation results are 0.7mm, 1.0mm and 1.3mm respectively; among them, L C It is the physical distance between any end of the second slit 1202 and the first slit 1201 , or the physical length of any slit arm 1203 .

[0087] Depend on Figure 10 It can be seen that as the parameter L C As L increases, the reflection coefficient of the millimeter wave broadband planar antenna 100 deteriorates, while the bandwidth remains unchanged; and C =0.7mm is the best choice (however, in the subsequent parameter optimization, L C The one taken is 1.0mm).

[0088] Figure 11 The reflection coefficient of the millimeter wave broadband planar antenna provided by the embodiment of the present invention is different at different W C (W C Refers to the simulation result diagram under the first gap width of the first gap).

[0089] Figure 11 The reflection coefficient of the millimeter wave broadband planar antenna 100 is shown in W C The simulation results are 0.1mm, 0.2mm and 0.3mm respectively; among them, W CIt is the first gap width of the first gap 1201 or the second gap width of the second gap 1202.

[0090] Depend on Figure 11 It can be seen that as the parameter W C As W increases, the reflection coefficient of the millimeter wave broadband planar antenna 100 deteriorates slightly, while the bandwidth remains basically unchanged; and C =0.1mm is the best choice.

[0091] Combined with 5- Figure 11 It can be seen that the optimized related parameters are: LA=11.5mm; WA=11.0mm; LG=3.8mm; WG=11.0mm; LP=7.0mm; WP=9.0mm; LT=2.0mm; WT=2.0mm; LC=1.0mm; WC=0.1mm; LF=4.0mm; WF=0.4mm.

[0092] Wherein, LA is the third physical width of the dielectric layer 2; WA is the third physical length of the dielectric layer 2; LG is the second physical width of the second metal layer 3; WG is the second physical length of the second metal layer 3; LP is the physical distance between the seventh side 127 and the eighth side 128; WP is the physical distance between the fifth side 125 and the sixth side 126; LT is the physical distance between the end of the fifth side 125 close to the seventh side 127 and the seventh side 127, or the size parameter of the right-angled sides parallel to the first direction 1001 in four identical triangles cut from the four right-angle positions of the rectangle; WT is The physical distance between one end of the eighth side 128 close to the fifth side 125 and the fifth side 125, or the dimension parameter of the right-angled sides parallel to the second direction 1002 in four identical triangles cut from the four right-angled positions of the rectangle; LC is the physical distance between any end of the second gap 1202 and the first gap 1201, or the physical length of any gap arm 1203; WC is the first gap width of the first gap 1201, or the second gap width of the second gap 1202; LF is the first physical length of the radiator 11; WF is the first physical width of the radiator 11.

[0093] Figure 12 This is a simulation result diagram of the reflection coefficient of the millimeter-wave broadband planar antenna provided by an embodiment of the present utility model.

[0094] See Figure 12It can be seen that the bandwidth range with a reflection coefficient less than -10dB is 9.5GHz to 35.5GHz, the center frequency is 22.5GHz, the absolute bandwidth is 26GHz, and the relative bandwidth is 115.6%. Therefore, the millimeter-wave broadband planar antenna 100 exhibits broadband characteristics; and there are two transmission poles in the passband, located at 11.8GHz, 23.8GHz, and 32.9GHz, respectively, ensuring the maximum gain and flatness of the radiation efficiency in the passband.

[0095] Figure 13 This is a simulation result diagram of the maximum gain and radiation efficiency of the millimeter-wave broadband planar antenna provided by an embodiment of the present utility model.

[0096] Depend on Figure 13 It is easy to see that within the passband, the average maximum gain of the millimeter-wave broadband planar antenna 100 is 4.55dBi, thus showing the advantage of high gain; in addition, within the passband, the average radiation efficiency of the millimeter-wave broadband planar antenna 100 is 95.9%, thus showing the advantage of high radiation efficiency.

[0097] It should be noted that the millimeter-wave broadband planar antenna 100 is an omnidirectional antenna (an antenna that can achieve 360° uniform radiation or reception of radio signals in the horizontal direction).

[0098] Specifically, omnidirectional antennas have the characteristics of non-directionality, vertical direction characteristics and wide coverage. Among them, the non-directional characteristic means that the omnidirectional antenna can achieve 360° uniform radiation in the horizontal direction, that is, there is no specific radiation direction, and the energy is relatively evenly distributed in all directions. In addition, the vertical direction characteristic means that the omnidirectional antenna has a beam of a certain width in the vertical direction (generally, the smaller the beam width, the greater the gain). In addition, the wide coverage range means that since the signal of the omnidirectional antenna can be transmitted in all directions, it is particularly suitable for application scenarios that require wide coverage.

[0099] In summary, omnidirectional antennas can play an important role in various communication fields due to their non-directional characteristics and wide coverage.

[0100] In summary, the millimeter-wave broadband planar antenna provided by the embodiments of the present invention has the advantages of miniaturization, high gain, and high radiation efficiency compared to traditional millimeter-wave broadband planar antennas. Therefore, the millimeter-wave broadband planar antenna provided by the embodiments of the present invention has certain novelties compared to traditional millimeter-wave broadband planar antennas.

[0101] The above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and the specific implementation of the present invention cannot be limited to these descriptions. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the concept of the present invention, and all of these modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A millimeter wave broadband planar antenna, characterized in that: include: a first metal layer, a dielectric layer, and a second metal layer; The dielectric layer is disposed between the first metal layer and the second metal layer to limit direct contact between the first metal layer and the second metal layer; The first metal layer is composed of a radiator and a feeder, and the radiator is connected to the feeder; the second metal layer can be used as a radio frequency ground of the millimeter wave broadband planar antenna; A first slot and a second slot are provided at the center of the feeder, and projections of the first slot and the second slot on the surface of the feeder are in a cross shape; The radiator, the dielectric layer and the second metal layer are all rectangular; the feed line is octagonal, and the octagon can be formed by cutting four identical triangles at four right-angle positions of the rectangle.

2. The millimeter wave broadband planar antenna according to claim 1, wherein: The feed line has a first side, a second side, a third side, a fourth side, a fifth side, a sixth side, a seventh side and an eighth side to enclose and form the octagon; The first side and the second side, the third side and the fourth side, the fifth side and the sixth side are all symmetrical about the first gap; The first side and the third side, the second side and the fourth side, the seventh side and the eighth side are all symmetrical about the second gap.

3. The millimeter wave broadband planar antenna according to claim 2, wherein: The physical lengths of the first side, the second side, the third side, and the fourth side are equal; The fifth side and the sixth side have the same physical length, and the seventh side and the eighth side have the same physical length.

4. The millimeter wave broadband planar antenna according to claim 2, wherein: The fifth side is located between the first side and the third side, and the sixth side is located between the second side and the fourth side; The seventh side is located between the first side and the second side, and the eighth side is located between the third side and the fourth side.

5. The millimeter wave broadband planar antenna according to claim 2, wherein: The radiator extends from the seventh side along the first direction away from the feed line to the edge of the dielectric layer; The first direction is the width direction of the second metal layer and is perpendicular to the seventh side.

6. The millimeter wave broadband planar antenna according to claim 5, wherein: The radiator has a preset first physical length in the first direction and a preset first physical width in the second direction; The second direction is the length direction of the second metal layer, and the first direction and the second direction are orthogonal to each other.

7. The millimeter wave broadband planar antenna according to claim 6, wherein: The second metal layer has a preset second physical length in the second direction and a preset second physical width in the first direction; The dielectric layer has a preset third physical length in the second direction and a preset third physical width in the first direction; The second physical length is equal to the third physical length, and the second physical width is smaller than the third physical width.

8. The millimeter wave broadband planar antenna according to claim 6, wherein: The first slit has a preset first slit length in the first direction and a preset first slit width in the second direction; The second slit has a preset second slit length in the second direction and a preset second slit width in the first direction.

9. The millimeter wave broadband planar antenna according to claim 8, wherein: The first gap length is equal to the second gap length, and the first gap width is equal to the second gap width.

10. The millimeter wave broadband planar antenna according to claim 6, wherein: The perpendicular bisector of the feed line in the first direction, the perpendicular bisector of the radiator in the first direction, the perpendicular bisector of the second metal layer in the first direction, the perpendicular bisector of the first slot in the first direction, and the perpendicular bisector of the second slot in the first direction coincide with each other.

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