Dual-band directional button antenna based on metamaterial lens

Abstract

The application relates to the technical field of directional button antennas, and provides a dual-frequency directional button antenna based on a metamaterial lens, which comprises a flexible dielectric substrate, a microstrip line, a metamaterial lens, a monopole metal column, a dielectric column, a bottom-loaded circular dielectric and a top-loaded circular dielectric; the bottom-loaded circular dielectric, the monopole metal column, the dielectric column and the top-loaded circular dielectric are sequentially connected; the metamaterial lens is located between the top-loaded circular dielectric and the bottom-loaded circular dielectric; the microstrip line is arranged on the flexible dielectric substrate and located on the side far away from the metamaterial lens; the application adds the metamaterial lens provided with a double-resonance structure unit, utilizes the near-field coupling resonance principle, makes the monopole metal column stimulate the metamaterial lens to generate two different resonance loops, thereby realizing the dual-frequency characteristic of the antenna, and can be used for monitoring and communication two modes of a novel power system.

Description

Technical Field

[0001] This invention relates to the field of directional button antenna technology, and more particularly to a dual-frequency directional button antenna based on a metamaterial lens. Background Technology

[0002] With the development of power systems and 5G technology, new power grids are evolving into converged networks. A large number of differentiated services are being accessed in 4G / 5G converged networks, and applications are being deployed in extreme environments, such as power utility tunnels with limited space. In order to monitor power equipment over a wide area, antennas are required to have omnidirectional radiation characteristics. At the same time, for communication between important power equipment or terminals, antennas with highly directional radiation patterns are beneficial for point-to-point high-speed data transmission.

[0003] Therefore, providing a dual-frequency multi-functional button antenna that can simultaneously perform large-area monitoring and point-to-point high-speed data transmission is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a dual-frequency compact directional button antenna based on metamaterial lens technology that can be used for differentiated services in new power systems. It aims to solve the problem mentioned in the background art, which uses near-field coupling resonance technology to excite metamaterials with a monopole to generate two different resonant circuits, thereby achieving dual-frequency characteristics and enabling simultaneous monitoring and high-speed data transmission.

[0005] This invention provides a dual-band directional button antenna based on a metamaterial lens, comprising a flexible dielectric substrate, a microstrip line, a metamaterial lens, a monopole metal pillar, a dielectric pillar, a bottom-loaded circular dielectric, and a top-loaded circular dielectric. The bottom-loaded circular dielectric, the monopole metal pillar, the dielectric pillar, and the top-loaded circular dielectric are connected sequentially. The metamaterial lens is located between the top-loaded circular dielectric and the bottom-loaded circular dielectric. The microstrip line is disposed on the flexible dielectric substrate and located on the side away from the metamaterial lens.

[0006] According to the dual-frequency directional button antenna based on metamaterial lenses provided by the present invention, the dielectric constant of the flexible dielectric substrate is 1.6 and the loss tangent is 0.02.

[0007] According to the dual-frequency directional button antenna based on metamaterial lenses provided by the present invention, the monopole metal pillar is embedded in a bottom-loaded circular medium, the medium pillar is stacked on the monopole metal pillar, and the top-loaded circular medium is loaded on the medium pillar.

[0008] According to the dual-frequency directional button antenna based on a metamaterial lens provided by the present invention, the metamaterial lens is disposed opposite to the monopole metal column, and the inner surface of the metamaterial lens is 2.9 mm away from the edge of the monopole metal column.

[0009] According to the dual-frequency directional button antenna based on a metamaterial lens provided by the present invention, the metamaterial lens is provided with a dual-resonant structure unit, and the metamaterial lens symmetrically places the dual-resonant structure unit along the longitudinal direction due to the monopole radiation characteristics.

[0010] According to the dual-frequency directional button antenna based on metamaterial lenses provided by the present invention, the central axis of the monopole metal column coincides with the central axis of the dielectric column, the central axis of the bottom-loaded circular dielectric, and the central axis of the top-loaded circular dielectric.

[0011] According to the dual-frequency directional button antenna based on metamaterial lenses provided by the present invention, the radius of the dielectric pillar is the same as the radius of the monopole metal pillar.

[0012] The present invention provides a dual-frequency directional button antenna based on a metamaterial lens. The button antenna is a structure composed of a bottom-loaded circular dielectric and a top-loaded circular dielectric-loaded monopole metal pillar and dielectric pillar. The metamaterial lens is located on one side of the button antenna, and the microstrip line is located on the flexible dielectric substrate, away from the metamaterial lens. Compared with the prior art, by adding a metamaterial lens with a dual-resonance structure, the near-field coupling resonance principle is used to excite the metamaterial lens by the monopole metal pillar to generate two different resonant circuits, thereby generating two resonant frequency points. The antenna has near-omnidirectional radiation characteristics in the low-frequency band, which can be used to monitor surrounding power equipment, and has a high-directional radiation pattern in the high-frequency band, which can be used for point-to-point high-speed data transmission. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is a three-dimensional structural schematic diagram of a dual-frequency directional button antenna provided in an embodiment of the present invention;

[0015] Figure 2 This is a side view of a dual-band directional button antenna provided in an embodiment of the present invention;

[0016] Figure 3 This is a top view of a dual-band directional button antenna provided in an embodiment of the present invention;

[0017] Figure 4 This is a front view of a dual-band directional button antenna provided in an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of a metamaterial lens provided in an embodiment of the present invention;

[0019] Figure 6 This is a schematic diagram of the structure of a single radiating unit provided in an embodiment of the present invention;

[0020] Figure 7 This is a schematic diagram illustrating the variation of the reflection coefficient of a dual-frequency directional button antenna with frequency, provided in an embodiment of the present invention.

[0021] Figure 8 This is an embodiment of the invention providing the E-plane and H-plane radiation patterns of a dual-frequency directional button antenna at a low frequency of 5.4 GHz;

[0022] Figure 9 This is an embodiment of the invention providing the E-plane and H-plane radiation patterns of a dual-frequency directional button antenna at a high frequency of 8.5 GHz.

[0023] Figure label:

[0024] 1. Flexible dielectric substrate; 2. Bottom-loaded circular dielectric; 3. Monopole metal pillar; 4. Dielectric pillar; 5. Top-loaded circular dielectric; 6. Metamaterial lens; 61. Radiation unit; 7. Microstrip line. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] The following is combined Figures 1 to 9 This invention describes a dual-frequency directional button antenna based on a metamaterial lens, as described in an embodiment of the present invention.

[0027] This embodiment provides a dual-frequency directional button antenna based on a metamaterial lens, such as... Figures 1 to 4 As shown, it includes: a flexible dielectric substrate 1, a bottom-loaded circular dielectric 2, a monopole metal pillar 3, a dielectric pillar 4, a top-loaded circular dielectric 5, a metamaterial lens 6, and a microstrip line 7.

[0028] The bottom-loaded circular medium 2 is disposed on the flexible dielectric substrate 1. The bottom-loaded circular medium 2, the monopole metal pillar 3, the dielectric pillar 4 and the top-loaded circular medium 5 are connected in sequence. The metamaterial lens 6 is located between the top-loaded circular medium 5 and the bottom-loaded circular medium 2. The microstrip line 7 is disposed on the flexible dielectric substrate 1 and is located on the side away from the metamaterial lens 6.

[0029] As can be seen from the above scheme, compared with the prior art, the dual-frequency directional button antenna provided by the present invention has a structure composed of a bottom-loaded circular dielectric 2 and a top-loaded circular dielectric 5, a monopole metal pillar 3 and a dielectric pillar 4, a metamaterial lens 6 located on one side of the button antenna, and a microstrip line located on the flexible dielectric substrate and away from the metamaterial lens 6, thus achieving a compact design. While maintaining the directional radiation capability of the antenna, it is easier to integrate into the corresponding system. Compared with the prior art, by adding a metamaterial lens 6 with a dual-resonant structure unit, the near-field coupling resonance principle is used to excite the metamaterial lens 6 with the monopole metal pillar 3 to generate two different resonant circuits, thereby generating two resonant frequency points. The antenna has near-omnidirectional radiation characteristics in the low-frequency band and can be used to monitor surrounding power equipment, and has a high-directional radiation pattern in the high-frequency band and can be used for point-to-point high-speed data transmission.

[0030] like Figure 1 As shown, optionally, the bottom-loaded circular dielectric 2 is fixedly connected to the upper surface of the flexible dielectric substrate 1, and the bottom-loaded circular dielectric 2, the monopole metal pillar 3, the dielectric pillar 4 and the top-loaded circular dielectric 5 are connected in sequence from bottom to top.

[0031] In some embodiments, the dielectric pillar 4 is superimposed on the monopole metal pillar 3 and has the same radius as the monopole metal pillar 3. The circular dielectric 5 loaded on the top is located on the dielectric pillar 4, forming a button shape, and at the same time has a certain fixing effect on the dielectric pillar 4. The bottom of the monopole metal pillar 3 is embedded in the center of the bottom-loaded circular dielectric 2, so that the bottom-loaded circular dielectric 2 has a certain fixing effect on the monopole metal pillar 3, and the circular dielectric with dielectric constant has a certain matching effect.

[0032] Reference Figure 3 In a further embodiment, the radius of the bottom-loaded circular medium 2 is the same as the radius of the top-loaded circular medium 5. The central axis of the monopole metal column 3 coincides with the central axis of the medium column 4, the central axis of the bottom-loaded circular medium 2, and the central axis of the top-loaded circular medium 5. The bottom-loaded circular medium 2, the monopole metal column 3, the medium column 4, and the top-loaded circular medium 5 are arranged in an I-shaped button configuration.

[0033] In this embodiment, the microstrip line 7 is located on the side close to the metamaterial lens 6, and has a length of approximately one quarter wavelength, thereby functioning as a matching component, a feeding component and a balun.

[0034] In this embodiment, since the flexible dielectric substrate 1 is made of a flexible dielectric material, such as all-fabric dielectric, rubber, etc., it has good dielectric performance and can be effectively conformed to various power devices; in a specific embodiment, the flexible dielectric substrate 1 has a dielectric constant of 1.6 and a loss tangent of 0.02; the flexible dielectric substrate 1 has a thickness of 1.5 mm, a length of 30 mm and a width of 25 mm, and such dimensions feature very miniaturization. The size of the flexible dielectric substrate 1 can adjust the matching and gain of the antenna.

[0035] In a specific embodiment of the present invention, the metamaterial lens 6 is arranged opposite to the monopole metal post 3, the inner side surface of the metamaterial lens 6 is 2.9 mm away from the edge of the monopole metal post 3, the metamaterial lens 6 is provided with dual resonant structure units, and the metamaterial lens 6 has the dual resonant structure units placed symmetrically along the longitudinal direction due to the radiation characteristics of the monopole.

[0036] Referring to Figure 5 , in this embodiment, the dual resonant structure units are a resonant ring microstructure array, and the resonant ring microstructure array is composed of 2×2 radiation units arranged in a rectangle; this is a result that takes into account the radiation characteristics of the monopole feed, forms a complete reflecting surface, and realizes a close-proximity compact in-phase reflection structure, which is the key to forming directional radiation of the button antenna. As shown in Figure 6 , each radiation unit 61 comprises a sun-shaped structure surrounded by strip-shaped grooves, an opening is provided in the middle of two mutually parallel and adjacent sides of the structure, and the entire resonant ring microstructure unit is symmetrical about the connecting line between the two openings. The resonant ring microstructure array is arranged as a symmetrical structure, and this symmetrical structure ensures the excellent radiation characteristics.

[0037] The dual-frequency directional button antenna based on a metamaterial lens provided by the present invention has small overall size and compact structure, can be used for differentiated services of new power systems, and the metamaterial lens 6 loaded with dual resonant structure units can enable the antenna to have dual-frequency characteristics. Wherein, the antenna has an approximately omnidirectional radiation characteristic in a low frequency band, which can monitor most power devices; in a high frequency band, due to its high directivity, the antenna can be used for point-to-point high-rate data transmission between power devices, and can be used for two modes of monitoring and communication in new power systems.

[0038] Referring to Figure 7 , which is a schematic diagram of the reflection coefficient of the button antenna varying with frequency, it can be seen that after loading the metamaterial lens 6, the antenna generates two resonant frequency points.

[0039] Referring to Figure 8The figure shows the polar coordinate far-field radiation pattern of the button antenna at 5.4 GHz. It can be seen that after loading the metamaterial lens with the dual-resonant structure, the impedance matching of the antenna is still well maintained. The button antenna provided in this embodiment of the invention has an omnidirectional radiation pattern at low frequencies.

[0040] Reference Figure 9 The figure shows the far-field radiation diagram of the button antenna at 8.5 GHz in polar coordinates. It can be seen that the button antenna provided in this embodiment of the invention can produce obvious directional radiation at high frequencies.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A dual-frequency directional button antenna based on a metamaterial lens, characterized in that, The system includes a flexible dielectric substrate (1), a microstrip line (7), a metamaterial lens (6), a monopole metal pillar (3), a dielectric pillar (4), a bottom-loaded circular dielectric (2), and a top-loaded circular dielectric (5). The bottom-loaded circular dielectric (2), the monopole metal pillar (3), the dielectric pillar (4), and the top-loaded circular dielectric (5) are connected in sequence. The metamaterial lens (6) is located between the top-loaded circular dielectric (5) and the bottom-loaded circular dielectric (2). The microstrip line (7) is disposed on the flexible dielectric substrate (1) and is located on the side away from the metamaterial lens (6). The metamaterial lens (6) is provided with a dual-resonant structure unit. Due to the monopole radiation characteristics, the metamaterial lens (6) places the dual-resonant structure unit symmetrically along the longitudinal direction. The dual-resonance structure unit is a resonant ring microstructure array, which consists of 2×2 radiating units (61). Each radiating unit (61) includes a sun-shaped structure surrounded by strip grooves. An opening is provided in the middle of the two parallel and adjacent sides of the sun-shaped structure. The radiating unit (61) is symmetrical about the line connecting the two openings.

2. The dual-frequency directional button antenna based on a metamaterial lens according to claim 1, characterized in that, The flexible dielectric substrate (1) has a dielectric constant of 1.6 and a loss tangent of 0.

02.

3. The dual-frequency directional button antenna based on a metamaterial lens according to claim 1, characterized in that, The monopole metal column (3) is embedded in the bottom-loaded circular medium (2), the medium column (4) is stacked on the monopole metal column (3), and the top-loaded circular medium (5) is loaded on the medium column (4).

4. The dual-frequency directional button antenna based on a metamaterial lens according to claim 1, characterized in that, The metamaterial lens (6) is positioned opposite to the monopole metal pillar (3), and the inner surface of the metamaterial lens (6) is 2.9 mm away from the edge of the monopole metal pillar (3).

5. The dual-frequency directional button antenna based on a metamaterial lens according to claim 1, characterized in that, The central axis of the monopole metal column (3) coincides with the central axis of the medium column (4), the central axis of the bottom-loaded circular medium (2), and the central axis of the top-loaded circular medium (5).

6. The dual-frequency directional button antenna based on a metamaterial lens according to claim 1, characterized in that, The radius of the dielectric column (4) is the same as the radius of the monopole metal column (3).

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