Ceiling Antenna

Abstract

The embodiment of the present application provides a ceiling antenna, comprising: a reflector; a support plate, fixed together with the reflector, the plane where the support plate is located is perpendicular to the plane where the reflector is located; a radiation array, attached to the support plate; wherein the radiation array comprises a substrate, a first radiator, a second radiator and a third radiator located on the substrate; two second radiators are respectively located on both sides of the first radiator, and the first radiator and the two second radiators are electrically connected together through the third radiator; a ground plate, attached to the support plate, located between the reflector and the radiation array, and insulated from the reflector; a connector, fixed to the support plate, located on a side of the ground plate away from the reflector, and electrically connected to a side of the third radiator close to the reflector; wherein the first radiator, the second radiator and the third radiator are all grid linear structures. The ceiling antenna has a wide radiation bandwidth, good omnidirectional radiation, and has the characteristics of high concealment and beauty.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a ceiling antenna. Background Art

[0002] With the continuous development of mobile communication technology, ceiling antennas are indispensable components in mobile communication devices. In addition to higher electrical performance requirements for ceiling antennas, people also have increasing requirements for the appearance of antennas. The ceiling antennas in related technologies have poor omnidirectionality in high frequency bands and low aesthetics.

[0003] Currently, there is an urgent need to design a new ceiling-mounted antenna to solve the above problems. Summary of the invention

[0004] The embodiment of the present application provides a ceiling-mounted antenna, which has a large radiation width, good omnidirectional radiation, and has the characteristics of high concealment and aesthetics.

[0005] The embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a ceiling antenna, comprising:

[0007] Reflective panels;

[0008] A support plate, fixed together with the reflector, wherein the plane where the support plate is located is perpendicular to the plane where the reflector is located;

[0009] A radiation array is attached to the support plate; wherein the radiation array comprises a substrate, a first radiator, a second radiator and a third radiator located on the substrate; two second radiators are respectively located on both sides of the first radiator, and the first radiator and the two second radiators are electrically connected together through the third radiator;

[0010] A ground plate, attached to the support plate, located between the reflector and the radiation array, and insulated from the reflector;

[0011] A connector, fixed on the support plate, located on a side of the ground plate away from the reflector, and electrically connected to a side of the third radiator close to the reflector;

[0012] Wherein, the first radiator, the second radiator and the third radiator are all grid line structures.

[0013] In some embodiments of the present application, the radiation array further includes at least two parasitic radiators, the parasitic radiators are located on a side of the second radiator away from the first radiator, and the two parasitic radiators are symmetrically arranged;

[0014] The parasitic radiator is a grid-line structure, and the first radiator, the second radiator and the third radiator are not connected to the parasitic radiator.

[0015] In some embodiments of the present application, the orthographic projection of the parasitic radiator on the first reference plane and the orthographic projection of the reflector on the first reference plane do not overlap each other;

[0016] The orthographic projection of the first radiator on the first reference plane, the orthographic projection of the second radiator on the first reference plane, and the orthographic projection of the third radiator on the first reference plane are all located within the orthographic projection of the reflector on the first reference plane;

[0017] Wherein, the first reference plane is parallel to the reflection plate.

[0018] In some embodiments of the present application, the distance between the parasitic radiator and the plane where the reflector is located is greater than or equal to the distance between the surface of the ground plate away from the reflector and the plane where the reflector is located in the direction perpendicular to the reflector.

[0019] In some embodiments of the present application, the radiation array is symmetrical about a second reference plane; the second reference plane passes through the geometric center of the first radiator and the geometric center of the third radiator, and is perpendicular to the plane where the reflector plate is located.

[0020] In some embodiments of the present application, the ground plate includes a substrate and a grid-line conductive layer located on the substrate, and the grid-line conductive layer is electrically connected to a ground terminal.

[0021] In some embodiments of the present application, materials of the support plate, the substrate and the base are all light-transmitting insulating materials.

[0022] In some embodiments of the present application, the third radiator includes a first connection portion, a second connection portion, a third connection portion, a fourth connection portion, and a fifth connection portion;

[0023] The first connection portion is located between the second connection portion and the third connection portion, the second connection portion and the third connection portion are symmetrically arranged, the fourth connection portion connects the first connection portion, the second connection portion and the third connection portion together; the fifth connection portion is located on a side of the fourth connection portion away from the first connection portion, and the fifth connection portion is connected to the fourth connection portion;

[0024] The first connection portion is connected to the first radiator, the second connection portion is connected to one of the two second radiators, the third connection portion is connected to the other of the two second radiators, and the fifth connection portion is electrically connected to the connector.

[0025] In some embodiments of the present application, a figure formed by the orthographic projection of the first connecting part on the support plate, the orthographic projection of the second connecting part on the support plate, the orthographic projection of the third connecting part on the support plate and the orthographic projection of the fourth connecting part on the support plate is an "E" shape.

[0026] In some embodiments of the present application, the orthographic projection shape of the first radiator on the support plate includes an arc, a polygon, or any one of a shape formed by splicing an arc and a polygon.

[0027] In some embodiments of the present application, the orthographic projection shape of the second radiator on the support plate is the same as the orthographic projection shape of the first radiator on the support plate.

[0028] In some embodiments of the present application, the orthographic projection shape of the parasitic radiator on the support plate includes a polygon.

[0029] In some embodiments of the present application, the polygon includes any one of a rectangle, an L-shape, a "convex" shape, and a "concave" shape.

[0030] An embodiment of the present application provides a ceiling antenna, comprising: a reflecting plate; a supporting plate fixed together with the reflecting plate, wherein the plane where the supporting plate is located is perpendicular to the plane where the reflecting plate is located; a radiating array attached to the supporting plate; wherein the radiating array comprises a substrate, a first radiator, a second radiator and a third radiator located on the substrate; the two second radiators are respectively located on both sides of the first radiator, and the first radiator and the two second radiators are electrically connected together through the third radiator; a grounding plate attached to the supporting plate, located between the reflecting plate and the radiating array, and insulated from the reflecting plate; a connector fixed to the supporting plate, located on a side of the grounding plate away from the reflecting plate, and electrically connected to a side of the third radiator close to the reflecting plate; wherein the first radiator, the second radiator and the third radiator are all grid linear structures.

[0031] In the embodiments of the present application, on the one hand, by distributing a second radiator on both sides of the first radiator and connecting the first radiator and the two second radiators together through the third radiator, there is a coupling effect between the first radiator and the second radiators on both sides thereof, which can effectively increase the bandwidth of the antenna; on the other hand, by arranging a ground plate between the reflector and the radiating array, a certain distance is maintained between the radiating array and the reflector in the vertical direction, thereby improving the omnidirectionality of the antenna in the high frequency band; on the other hand, arranging the first radiator, the second radiator and the third radiator into a grid linear structure can effectively improve the transmittance of the radiating array, so that the ceiling-mounted antenna has better concealment and higher aesthetics.

[0032] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1-Figure 3 A schematic diagram of the structures of three ceiling-mounted antennas provided in the embodiments of the present application;

[0035] Figure 4 Four structural schematic diagrams of the first radiator, the second radiator or the third radiator provided in the embodiments of the present application;

[0036] Figure 5 Three structural schematic diagrams of parasitic radiators provided in embodiments of the present application;

[0037] Figure 6 A curve diagram showing the variation of an S parameter with an operating frequency provided in an embodiment of the present application;

[0038] Figure 7 A radiation pattern of a ceiling antenna provided in an embodiment of the present application at a center frequency in a frequency band of 0.86 GHz to 0.97 GHz;

[0039] Figure 8 A radiation pattern of a ceiling antenna provided in an embodiment of the present application at a center frequency in a frequency band of 1.58 GHz to 2.55 GHz;

[0040] Fig. 9 A comparison diagram of radiation patterns before and after the radiation array is raised by setting a ground plate provided in an embodiment of the present application;

[0041] Fig.10 A comparison diagram of radiation patterns before and after a parasitic radiator is provided in an embodiment of the present application. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In the drawings, the thickness of regions and layers may be exaggerated for clarity. The same reference numerals in the drawings represent the same or similar structures, and thus their detailed descriptions will be omitted. In addition, the drawings are only schematic illustrations of the present application and are not necessarily drawn to scale.

[0044] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0045] In the embodiments of the present application, words such as "first" and "second" are used to indicate parts of identical or similar items having substantially the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present application and shall not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0046] The embodiment of the present application provides a ceiling antenna, referring to Figure 1 As shown, including:

[0047] Reflector 2;

[0048] The support plate 3 is fixed together with the reflector plate 2, and the plane where the support plate 3 is located is perpendicular to the plane where the reflector plate 2 is located;

[0049] The radiation array 1 is attached to the support plate 3; wherein the radiation array 1 includes a substrate (not shown), a first radiator 11, a second radiator 12 and a third radiator 13 located on the substrate; the two second radiators 12 are respectively located on both sides of the first radiator 11, and the first radiator 11 and the two second radiators 12 are electrically connected together through the third radiator 13;

[0050] The ground plate 4 is attached to the support plate 3, located between the reflector plate 2 and the radiation array 1, and is insulated from the reflector plate 2;

[0051] The connector 5 is fixed on the support plate 3, located on a side of the ground plate 4 away from the reflector 2, and electrically connected to a side of the third radiator 13 close to the reflector 4;

[0052] The first radiator 11 , the second radiator 12 and the third radiator 13 are all grid-line structures.

[0053] Figure 2 A side view of the radiating element 1 and the ground plate 4 of the ceiling antenna is shown.

[0054] In an exemplary embodiment, the material of the first radiator 11 is a metal material, such as copper, titanium, magnesium; or, it can also be glass fiber with a metal coating; or, it can also be a resin with a conductive carbon material coated on the surface, wherein the conductive carbon material includes graphene, carbon fiber, and carbon nanotubes.

[0055] In an exemplary embodiment, the first radiator 11 , the second radiator 12 , and the third radiator 13 are made of the same material.

[0056] Exemplarily, the line width of the grid lines of the first radiator 11 may range from 2 μm to 30 μm, the spacing between adjacent grid lines of the first radiator 11 may range from 50 μm to 200 μm, and the thickness of the first radiator 11 along a direction perpendicular to its substrate may range from 1 μm to 10 μm.

[0057] In an exemplary embodiment, the line width of the grid lines of the first radiator 11 can be set smaller than the spacing between adjacent grid lines of the first radiator 11 , and the thickness of the first radiator 11 along the direction perpendicular to the substrate can be set smaller than the line width of the grid lines of the first radiator 11 .

[0058] In an exemplary embodiment, the grid lines of the first radiator 11 , the second radiator 12 and the third radiator 13 have the same line width, the same spacing between adjacent grid lines, and the same thickness in a direction perpendicular to the substrate.

[0059] The orthographic projection shapes of the first radiator 11 , the second radiator 12 and the third radiator 13 on the support plate 3 are not limited here, and their specific shapes can be determined according to actual conditions.

[0060] It should be noted that the substrate of the radiation array 1 is intended to support the first radiator 11 of the grid linear structure, the second radiator 12 of the grid linear structure, and the third radiator 13 of the grid linear structure to avoid damage to the grid linear structure, and in order not to affect the light transmittance of each radiator, the substrate can include highly light-transmitting PET (Polyethylene Terephthalate) material; or, PI material (Polyimide) material.

[0061] In an exemplary embodiment, the radiation array 1 includes a first radiator 11 with a grid line structure, a second radiator 12 with a grid line structure, and a third radiator 13 with a grid line structure, and the radiation array 1 with a grid line structure has a light transmittance greater than 70%, for example, in the range of 70%-88%.

[0062] In an exemplary embodiment, the radiation array 1 is a grid-shaped transparent conductive film, including a transparent and insulating substrate and a plurality of radiators with a grid-shaped structure on the substrate. In practical applications, each grid-shaped radiator can be prepared by an etching process or an embossing process.

[0063] In an exemplary embodiment, the first radiator 11 of the grid line structure, the second radiator 12 of the grid line structure, and the third radiator 13 of the grid line structure are bonded to the support plate 3 through a substrate.

[0064] For example, a bonding layer may be provided between the substrate and the support plate 3. In practical applications, the bonding layer may be an adhesive, for example, OCA (Optically Clear Adhesive).

[0065] In the embodiments of the present application, on the one hand, by setting each radiator as a grid linear structure and combining it with a light-transmitting substrate, a radiation array 1 with good light transmittance can be obtained; on the other hand, by adjusting the line width, line spacing and thickness of the grid linear structure, the light transmittance of the radiation array 1 can be further improved without affecting the electrical performance of the radiation array 1, thereby improving the aesthetics of the ceiling antenna and making it better integrated into the surrounding environment.

[0066] The radiation array 1 is attached to the support plate 3. The support plate 3 is a substrate with a certain mechanical strength, which further supports the radiation array 1, thereby improving the structural stability of the ceiling antenna.

[0067] In an exemplary embodiment, the material of the support plate 3 may be a transparent hard plastic, such as PC (Polycarbonate), COP (Copolymers of Cycloolefin), PMMA (Polymethyl Methacrylate) or PET (Polyethylene Terephthalate); or, the material of the support plate 3 may also be low-loss optical glass.

[0068] In an exemplary embodiment, the thickness of the support plate 3 along a direction perpendicular to the radiation array 1 ranges from 1 mm to 3 mm.

[0069] In an exemplary embodiment, the connector 5 may be a 50-ohm SMA (Small A Type) connector, so that the ceiling antenna can be easily connected to other electrical devices. It should be noted that the SMA connector is a typical microwave high-frequency connection interface, and the ceiling wire receives input signals from the outside through the 50-ohm SMA connector.

[0070] In an exemplary embodiment, the orthographic projection of the ground plate 4 on the support plate 3 is located within the outer contour of the support plate 3 , and the outer contour of the orthographic projection of the ground plate 4 on the support plate 3 does not overlap with the outer contour of the support plate 3 .

[0071] In an exemplary embodiment, by setting a ground plate 4 between the reflector 2 and the radiating array 1, the distance between the radiating array 1 and the reflector 2 in a direction perpendicular to the reflector 2 is increased, and the roundness of the radiation pattern of the ceiling antenna when radiating in the horizontal direction is improved, thereby improving the omnidirectional radiation performance of the ceiling antenna.

[0072] In an exemplary embodiment, the orthographic projection shape of the ground plate 4 on the support plate 3 may be a rectangle, and the width of the rectangle in a direction perpendicular to the reflective plate 2 is not limited.

[0073] In an exemplary embodiment, the reflector 2 and the ground plate 4 do not contact each other, and a gap exists between the ground plate 4 and the reflector 2 in a direction perpendicular to the reflector 2. Exemplarily, the width of the gap in a direction perpendicular to the reflector 2 can be set to 1 mm.

[0074] In an exemplary embodiment, the orthographic projection shape of the reflective plate 2 on the first reference plane is a circle, wherein the first reference plane is parallel to the reflective plate 2 .

[0075] In an exemplary embodiment, the reflective plate 2 includes a conductive layer having a grid-line structure, and the reflective plate 2 is also attached to the support plate 3 via an adhesive layer.

[0076] An embodiment of the present application provides a ceiling antenna, comprising: a reflector 2; a support plate 3, fixed together with the reflector 2, and the plane where the support plate 3 is located is perpendicular to the plane where the reflector 2 is located; a radiation array 1, attached to the support plate 3; wherein the radiation array 1 comprises a substrate, a first radiator 11, a second radiator 12 and a third radiator 13 located on the substrate; the two second radiators 12 are respectively located on both sides of the first radiator 11, and the first radiator 11 and the two second radiators 12 are electrically connected together through the third radiator 13; a ground plate 4, attached to the support plate 3, located between the reflector 2 and the radiation array 1, and insulated from the reflector 2; a connector 5, fixed on the support plate 3, located on a side of the ground plate 4 away from the reflector 2, and electrically connected to a side of the third radiator 13 close to the reflector 4; wherein the first radiator 11, the second radiator 12 and the third radiator 13 are all grid linear structures.

[0077] In the embodiments of the present application, on the one hand, by distributing a second radiator 12 on both sides of the first radiator 11 and connecting the first radiator 11 and the two second radiators 12 together through the third radiator 13, there is a coupling effect between the first radiator 11 and the second radiators 12 located on both sides thereof, which can effectively increase the bandwidth of the antenna; on the other hand, by arranging a ground plate 4 between the reflector 2 and the radiating array 1, a certain distance is maintained between the radiating array 1 and the reflector 2 in the vertical direction, thereby improving the omnidirectional radiation of the antenna; on the other hand, arranging the first radiator 11, the second radiator 12 and the third radiator 13 into a grid linear structure can effectively improve the transmittance of the radiating array, so that the ceiling antenna has better concealment and higher aesthetics.

[0078] In addition, refer to Fig. 9 As shown, a ceiling antenna is provided in which a ground plate 4 is arranged between a reflector 2 and a radiation array 1 to raise the radiation array 1 ( Fig. 9 The mark in the middle is raised) and the ceiling antenna without a ground plate 4 between the reflector 2 and the radiation array 1 ( Fig. 9 Comparison of the directional diagrams (with the mark not raised). Fig.10 It can be seen that compared with the radiation pattern of the ceiling antenna in which the ground plate 4 is not arranged between the reflector 2 and the radiating array 1, after the ground plate 4 is arranged between the reflector 2 and the radiating array 1, the gains of the radiation pattern near 90°, -90°, 0°, 40° and 140° are significantly improved. At some angles, the antenna gain increases from 0.6dBi to 1.7dBi.

[0079] In some embodiments of the present application, reference Figure 1As shown, the radiation array 1 further includes at least two parasitic radiators 14, the parasitic radiators 14 are located on a side of the second radiator 12 away from the first radiator 11, and the two parasitic radiators 14 are symmetrically arranged;

[0080] The parasitic radiator 14 is a grid-line structure, and the first radiator 11 , the second radiator 12 and the third radiator 13 are not connected to the parasitic radiator 14 .

[0081] Exemplarily, the line width of the grid lines of the parasitic radiator 14 may range from 2 μm to 30 μm, the spacing between adjacent grid lines of the parasitic radiator 14 may range from 50 μm to 200 μm, and the thickness of the parasitic radiator 14 along a direction perpendicular to its substrate may range from 1 μm to 10 μm. In addition, the line width of the grid lines of the parasitic radiator 14 may be set smaller than the spacing between adjacent grid lines of the parasitic radiator 14, and the thickness of the parasitic radiator 14 along a direction perpendicular to the substrate may be set smaller than the line width of the grid lines of the parasitic radiator 14.

[0082] Exemplarily, in order to reduce the difficulty of the manufacturing process, the grid line structure of the parasitic radiator 14 is set to be the same as the grid line structure of the first radiator 11 , the second radiator 12 and the third radiator 13 .

[0083] Exemplarily, the orthographic projection shape of the parasitic radiator 14 on the support plate 3 may be a rectangle.

[0084] In the embodiment of the present application, by providing a parasitic radiator in the radiation array 1, the radiation omnidirectionality of the ceiling antenna is effectively improved. Fig.10 Provides a comparison of the directional patterns of ceiling antennas with and without parasitic radiators. Fig.10 It can be seen that in the ceiling antenna without the parasitic radiator 14, the gain in the vertical direction (near 0° and 180°) is larger, while the gain in the horizontal direction (near ±90°) is smaller, and the circularity of the radiation pattern is poor; however, in the ceiling antenna with the parasitic radiator 14, the gain in the vertical direction (near 0° and 180°) is relatively reduced, while the gain in the horizontal direction (near ±90°) is relatively increased, which improves the circularity of the radiation pattern gain in the horizontal direction.

[0085] In some embodiments of the present application, reference Figure 1 As shown, the orthographic projection of the parasitic radiator 13 on the first reference plane and the orthographic projection of the reflector 2 on the first reference plane do not overlap each other;

[0086] The orthographic projection of the first radiator 11 on the first reference plane, the orthographic projection of the second radiator 12 on the first reference plane, and the orthographic projection of the third radiator 13 on the first reference plane are all located within the orthographic projection of the reflector 2 on the first reference plane;

[0087] The first reference plane is parallel to the reflection plate 2 .

[0088] It should be noted that the first reference plane and the second reference plane mentioned below do not actually exist, but are only reference concepts proposed for the convenience of describing the structure of the ceiling antenna and are explained here.

[0089] Compared with the ceiling antenna in the related art, in the embodiment of the present application, the reflector 2 is retracted so that the orthographic projection of the parasitic radiator 13 on the first reference plane and the orthographic projection of the reflector 2 on the first reference plane do not overlap with each other. In this way, the radiation performance of the ceiling antenna in the horizontal direction can be further improved.

[0090] In some embodiments of the present application, reference Figure 1 As shown, the distance D2 from the parasitic radiator 14 in a direction perpendicular to the reflector 2 to the plane where the reflector 2 is located is greater than or equal to the distance D1 from the surface of the ground plate 4 away from the reflector to the plane where the reflector 2 is located in a direction perpendicular to the reflector 2.

[0091] In an exemplary embodiment, when the distance D2 from the parasitic radiator 14 extending in a direction perpendicular to the reflector 2 to the plane where the reflector 2 is located is equal to the distance D1 from the surface of the ground plate 4 away from the reflector to the plane where the reflector 2 is located in the direction perpendicular to the reflector 2, the parasitic radiator 14 and the ground plate 4 do not contact each other. It can be understood that at this time, the orthographic projection of the parasitic radiator 14 on the first reference plane and the orthographic projection of the ground plate 4 on the first reference plane do not overlap with each other.

[0092] In an exemplary embodiment, when the distance D2 from the parasitic radiator 14 in a direction perpendicular to the reflector 2 to the plane where the reflector 2 is located is greater than the distance D1 from the surface of the ground plate 4 away from the reflector to the plane where the reflector 2 is located in the direction perpendicular to the reflector 2, the orthographic projection of the parasitic radiator 14 on the first reference plane and the orthographic projection of the ground plate 4 on the first reference plane do not overlap with each other; or, the orthographic projection of the parasitic radiator 14 on the first reference plane and the orthographic projection of the ground plate 4 on the first reference plane at least partially overlap with each other.

[0093] The sizes of the distance D1 and the distance D2 are not limited here and can be adjusted according to actual conditions.

[0094] In some embodiments of the present application, reference Figure 1 As shown, the radiation array 1 is symmetrical about the second reference plane; the second reference plane passes through the geometric center of the first radiator 11 and the geometric center of the third radiator 13, and is perpendicular to the plane where the reflection plate 2 is located.

[0095] In some embodiments of the present application, the ground plane 4 includes a substrate and a grid-line conductive layer located on the substrate, and the grid-line conductive layer is electrically connected to the ground terminal.

[0096] Exemplarily, the grid lines of the grid-line conductive layer may have a line width ranging from 2 μm to 30 μm, the spacing between adjacent grid lines of the grid-line conductive layer may range from 50 μm to 200 μm, and the thickness of the grid-line conductive layer in a direction perpendicular to its substrate may range from 1 μm to 10 μm.

[0097] In an exemplary embodiment, the line width of the grid lines of the grid-line conductive layer can be set smaller than the spacing between adjacent grid lines of the grid-line conductive layer, and the thickness of the grid-line conductive layer along a direction perpendicular to the substrate can be set smaller than the line width of the grid lines of the grid-line conductive layer.

[0098] In an exemplary embodiment, the material of the grid line conductive layer is a metal material, such as copper, titanium, magnesium; or, it can also be glass fiber with a metal coating; or, it can also be a resin with a conductive carbon material coated on the surface, wherein the conductive carbon material includes graphene, carbon fiber, and carbon nanotubes.

[0099] In some embodiments of the present application, the materials of the support plate 3, the substrate and the base are all light-transmitting insulating materials.

[0100] Exemplarily, the light-transmitting insulating material includes any one of PC (Polycarbonate), COP (Copolymers of Cycloolefin), PMMA (Polymethyl Methacrylate) or PET (Polyethylene Terephthalate).

[0101] In some embodiments of the present application, the third radiator 13 includes a first connection portion 131 , a second connection portion 132 , a third connection portion 133 , a fourth connection portion 134 and a fifth connection portion 135 ;

[0102] The first connection portion 131 is located between the second connection portion 132 and the third connection portion 133, the second connection portion 132 and the third connection portion 133 are symmetrically arranged, and the fourth connection portion 134 connects the first connection portion 131, the second connection portion 132 and the third connection portion 133 together; the fifth connection portion 135 is located on a side of the fourth connection portion 134 away from the first connection portion 131, and the fifth connection portion 135 is connected to the fourth connection portion 134;

[0103] The first connection portion 131 is connected to the first radiator 11 , the second connection portion 132 is connected to one of the two second radiators 12 , the third connection portion 133 is connected to the other of the two second radiators 12 , and the fifth connection portion 135 is electrically connected to the connector 5 .

[0104] In some embodiments of the present application, a figure formed by the orthographic projection of the first connection portion 131 on the support plate 3, the orthographic projection of the second connection portion 132 on the support plate 3, the orthographic projection of the third connection portion 133 on the support plate 3 and the orthographic projection of the fourth connection portion 134 on the support plate 3 is an "E" shape.

[0105] In an exemplary embodiment, the orthographic projection shapes of the first connection portion 131 , the second connection portion 132 , the third connection portion 133 , the fourth connection portion 134 , and the fifth connection portion 135 on the support plate 3 are all rectangular.

[0106] In an exemplary embodiment, the orthographic projection shape of the first radiator 11 on the support plate 3 is an inverted trapezoid, the orthographic projection shape of the second radiator 12 on the support plate 3 is a regular trapezoid, and the orthographic projection shape of the third radiator 13 on the support plate 3 is the same as the shape and size of the orthographic projection of the second radiator 12 on the support plate 3.

[0107] In some embodiments of the present application, reference Figure 4 As shown, the orthographic projection shape of the first radiator 11 on the support plate 3 includes an arc, a polygon, or any one of a shape formed by splicing an arc and a polygon.

[0108] Among them, arcs include sectors, circles and Figure 4 The ellipse shown in Figure (2) and the polygon include Figure 4 The triangle shown in Figure (3) Figure 4 The quadrilateral and pentagon shown in Figure (1) and Figure 4 The hexagon shown in Figure (4) etc.

[0109] In some embodiments of the present application, the orthographic projection shape of the second radiator 12 on the support plate 3 is the same as the orthographic projection shape of the first radiator 11 on the support plate 3 .

[0110] Exemplary, reference Figure 1 As shown, the orthographic projection shape of the second radiator 12 on the support plate 3 and the orthographic projection shape of the first radiator 11 on the support plate 3 are both trapezoidal.

[0111] In some embodiments of the present application, the orthographic projection shape of the parasitic radiator 14 on the supporting plate 3 includes a polygon.

[0112] In some embodiments of the present application, polygons include rectangles, Figure 5The L-shaped Figure 5 The “convex” shape shown in Figure (2) and Figure 5 Any of the “concave” shapes shown in Figure (3) above.

[0113] Figure 3 The following is a diagram illustrating the dimensions of a ceiling antenna provided in an embodiment of the present application. Figure 3 As shown, the length of h1 can be 60mm, the length of h2 can be 50mm, the length of h3 can be 25mm, the length of h4 can be 10mm, the length of h5 can be 75mm, the length of h6 can be 10mm, the length of h7 can be 30mm, and the length of h8 can be 12mm. It should be noted that the size provided here is only an example of the size of the ceiling antenna, and its actual size is not limited to this and can be adjusted according to the situation.

[0114] The following provides a specific structure of a ceiling antenna, and based on the structure, explains its operating frequency bandwidth and related radiation direction characteristics.

[0115] refer to Figure 1 As shown, the radiation array 1 and the ground plate 4 are both metal grid linear structures, the line width of the grid lines is in the range of 2μm-30μm, the spacing between adjacent grid lines is in the range of 20μm-250μm, and the thickness of the grid linear structure is in the range of 1μm-10μm.

[0116] The substrate of the radiation array 1 and the base of the grounding plate 4 are made of the same material, and are any one of PC (Polycarbonate), COP (Copolymers of Cycloolefin), and PMMA (PolymethylMethacrylate). The total thickness of the radiation array 1 is in the range of 50 μm-250 μm, and the total thickness of the grounding plate 4 is in the range of 50 μm-250 μm.

[0117] The specific dimensions of the ceiling antenna can be referred to Figure 3 Among them, the length of h1 is 60mm, the length of h2 is 50mm, the length of h3 is 25mm, the length of h4 is 10mm, the length of h5 is 75mm, the length of h6 is 10mm, the length of h7 is 30mm, and the length of h8 is 12mm.

[0118] Figure 6 The figure shows the curve diagram of the operating frequency and S parameter (S11) of the ceiling antenna, where S parameter = reflected wave intensity: incident wave intensity. Figure 6It can be seen from the curve in that the ceiling antenna provided in the embodiment of the present application has a dual-frequency characteristic. When the S parameter (S11) is less than -10dB, the operating frequency of the ceiling antenna can cover two frequency bands: 0.86GHz-0.97GHz and 1.58GHz-2.55GHz. The relative bandwidth of the 0.86GHz-0.97GHz frequency band is 12%, and the relative bandwidth of the 1.58GHz-2.55GHz frequency band is 47%. The ceiling antenna has a very wide operating frequency band and can be applied to a variety of communication systems, and has relatively wide application characteristics.

[0119] Figure 7 The directional pattern of the ceiling antenna at the center frequency of the 0.86GHz-0.97GHz frequency band is shown. Figure 7 From the curve in, we can see that at the center frequency of the low frequency band, the gain of the ceiling antenna is greater than or equal to 1.5dBi, and it has good omnidirectional radiation performance. It should be noted that gain refers to the ratio of the power density of the signal generated by the actual antenna and the ideal radiating unit at the same point in space under the condition of equal input power. Gain is a physical quantity that measures the degree to which the intensity of the radiated signal increases.

[0120] Figure 8 The radiation pattern of the ceiling antenna at the center frequency of the 1.58 GHz-2.55 GHz frequency band is shown. Figure 8 From the curve in the figure, we can see that at the center frequency of the low frequency band, the gain of the ceiling antenna is greater than or equal to 1.3dBi, and it has good omnidirectional radiation performance.

[0121] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A ceiling antenna, It is characterized in that include: Reflective panels; A support plate, fixed together with the reflector, wherein the plane where the support plate is located is perpendicular to the plane where the reflector is located; A radiation array is attached to the support plate; wherein the radiation array comprises a substrate, a first radiator, a second radiator and a third radiator located on the substrate; two second radiators are respectively located on both sides of the first radiator, and the first radiator and the two second radiators are electrically connected together through the third radiator; A ground plate, attached to the support plate, located between the reflector and the radiation array, and insulated from the reflector; A connector, fixed on the support plate, located on a side of the ground plate away from the reflector, and electrically connected to a side of the third radiator close to the reflector; Wherein, the first radiator, the second radiator and the third radiator are all grid-line structures; The radiation array is symmetrical about a second reference plane; the second reference plane passes through the geometric center of the first radiator and the geometric center of the third radiator, and is perpendicular to the plane where the reflection plate is located.

2. The ceiling antenna according to claim 1, It is characterized in that The radiation array further includes at least two parasitic radiators, the parasitic radiators are located on a side of the second radiator away from the first radiator, and the two parasitic radiators are symmetrically arranged; The parasitic radiator is a grid-line structure, and the first radiator, the second radiator and the third radiator are not connected to the parasitic radiator.

3. The ceiling antenna according to claim 2, It is characterized in that The orthographic projection of the parasitic radiator on the first reference plane and the orthographic projection of the reflector on the first reference plane do not overlap each other; The orthographic projection of the first radiator on the first reference plane, the orthographic projection of the second radiator on the first reference plane, and the orthographic projection of the third radiator on the first reference plane are all located within the orthographic projection of the reflector on the first reference plane; Wherein, the first reference plane is parallel to the reflection plate.

4. The ceiling antenna according to claim 2, It is characterized in that The distance between the parasitic radiator in a direction perpendicular to the reflector and the plane where the reflector is located is greater than or equal to the distance between the surface of the ground plate away from the reflector and the plane where the reflector is located in a direction perpendicular to the reflector.

5. The ceiling antenna according to claim 1, It is characterized in that The grounding plate comprises a substrate and a grid-line conductive layer located on the substrate, and the grid-line conductive layer is electrically connected to a grounding terminal.

6. The ceiling antenna according to claim 5, It is characterized in that The support plate, the substrate and the base are all made of light-transmitting insulating materials.

7. The ceiling antenna according to claim 1, It is characterized in that The third radiator includes a first connecting portion, a second connecting portion, a third connecting portion, a fourth connecting portion and a fifth connecting portion; The first connection portion is located between the second connection portion and the third connection portion, the second connection portion and the third connection portion are symmetrically arranged, the fourth connection portion connects the first connection portion, the second connection portion and the third connection portion together; the fifth connection portion is located on a side of the fourth connection portion away from the first connection portion, and the fifth connection portion is connected to the fourth connection portion; The first connection portion is connected to the first radiator, the second connection portion is connected to one of the two second radiators, the third connection portion is connected to the other of the two second radiators, and the fifth connection portion is electrically connected to the connector.

8. The ceiling antenna according to claim 7, It is characterized in that The figure formed by the orthographic projection of the first connecting part on the support plate, the orthographic projection of the second connecting part on the support plate, the orthographic projection of the third connecting part on the support plate and the orthographic projection of the fourth connecting part on the support plate is an "E" shape.

9. The ceiling antenna according to claim 1, It is characterized in that The orthographic projection shape of the first radiator on the support plate includes any one of an arc, a polygon, or a shape formed by combining an arc and a polygon.

10. The ceiling antenna according to claim 9, It is characterized in that The orthographic projection shape of the second radiator on the support plate is the same as the orthographic projection shape of the first radiator on the support plate.

11. The ceiling antenna according to claim 2, It is characterized in that The orthographic projection shape of the parasitic radiator on the support plate includes a polygon.

12. The ceiling antenna according to claim 11, It is characterized in that The polygon includes any one of a rectangle, an L-shape, a convex shape and a concave shape.

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