A rhombic metamaterial based circularly polarized resonator antenna
By setting up an array of rhombic superdielectric resonators on a substrate and utilizing the coupling between the rhombic superdielectric resonators, a simple and easy-to-fabricate rhombic superdielectric circularly polarized resonator antenna was designed. This solves the problem of complex design of dielectric resonator antennas in the prior art and achieves broadband circularly polarized radiation and a wide axial ratio.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
- Filing Date
- 2023-07-10
- Publication Date
- 2026-06-02
AI Technical Summary
In the existing technology, the circular polarization design of dielectric resonator antennas lacks new design freedom, makes it difficult to provide design methods with more functions, and has a complex structure that is inconvenient to manufacture.
Design a circularly polarized resonator antenna based on a rhombic metadielectric. By setting an array of rhombic metadielectric resonators on a substrate, circularly polarized radiation is generated by the coupling between the rhombic metadielectric resonators. Broadband circularly polarized radiation is achieved by using the array of rhombic metadielectric resonators.
It achieves broadband circularly polarized radiation with simple structure and easy processing, has a wide axial ratio, provides new design freedom, and improves the design flexibility of antennas.
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Figure CN116742351B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of metamaterial antenna technology and relates to a circularly polarized resonator antenna based on a rhombic metadielectric. Background Technology
[0002] Electromagnetic metamaterials, unlike ordinary materials in nature, are man-made materials with unique electromagnetic properties such as negative equivalent permeability, negative equivalent permittivity, and negative refractive index. In recent years, research on the electromagnetic properties and applications of metamaterials has received widespread attention and has permeated the design and application of various microwave devices. Using electromagnetic metamaterials in antennas can overcome the half-wavelength limitation of traditional materials. Combined with the backwave effect of metamaterials, the antenna bandwidth of -10 dB can be broadened and the antenna radiation directivity can be improved.
[0003] Electromagnetic wave polarization has three types: linear polarization, elliptic polarization, and circular polarization. Circular polarization refers to the circular rotation of the endpoints of the resultant electric field vector of two polarized waves. Therefore, electromagnetic waves propagating along the z-axis can be described by equations in the xy two-dimensional plane. With the rapid development of satellite and communication technologies, circular polarization has become the dominant polarization method due to its advantage in resisting multipath interference. Circularly polarized dielectric resonator antennas are widely used in transceiver devices due to their simple structure, high efficiency, and wide bandwidth. They have demonstrated significant application value in radar detection, mobile satellite communication, and phased array antennas. Furthermore, based on practical needs in real life, such as electromagnetic interference countermeasures, enemy aircraft reconnaissance, and communication in adverse weather conditions, the demand for circularly polarized antennas is increasing. Existing technologies have proposed many improved structures to achieve circular polarization radiation functionality for dielectric resonator antennas, but these structures lack new design freedom and are difficult to provide design methods for more functions. Summary of the Invention
[0004] The technical problem to be solved by this invention is how to design a circularly polarized resonator antenna with a simple structure and wide-axis bit points in a rhombic metadielectric.
[0005] The present invention solves the above-mentioned technical problems through the following technical solutions:
[0006] A circularly polarized resonator antenna based on a rhombic metadielectric includes: a substrate (10), a rectangular microstrip line (11), a rectangular slot (12), a rhombic metadielectric resonator radiator array, and an excitation port (14).
[0007] The front side of the substrate (10) is a ground plane, and a rectangular slot (12) is provided in the middle of the ground plane. A rectangular microstrip line (11) is provided on the back side of the substrate (10). The long side of the projection of the rectangular microstrip line (11) and the rectangular slot (12) on the back side of the substrate (10) are perpendicular to each other. The lower end of the rectangular microstrip line (11) is aligned with the bottom edge of the substrate (10) and serves as the excitation port (14) of the antenna. The upper end of the rectangular microstrip line (11) crosses the rectangular slot (12) and extends towards the top edge of the substrate (10).
[0008] The rhombic superdielectric resonator radiator array is disposed on the ground surface. The two diagonals of the rhombic superdielectric resonator radiator array coincide with the two diagonals of the substrate (10), and the center lines of the rhombic superdielectric resonator radiator array in the x-axis and y-axis directions coincide with the center lines of the square substrate (10) in the x-axis and y-axis directions, respectively. The outline shape of the projection of the rhombic superdielectric resonator radiator array on the ground surface is hexagonal.
[0009] The array of rhombic superdielectric resonators includes 14 rhombic superdielectric resonators (13), which form a 4-row × 4-column rhombic superdielectric resonator array. Each rhombic superdielectric resonator (13) is tilted 45° to the left or right. The first and fourth rows each have 3 rhombic superdielectric resonators (13), the second and third rows each have 4 rhombic superdielectric resonators (13), the first and fourth columns each have 3 rhombic superdielectric resonators (13), the second and third columns each have 4 rhombic superdielectric resonators (13), and the gaps between each row and each column are equal.
[0010] The center line of the gap formed between the second and third rows of the rhombic superdielectric resonator radiator array, i.e. the center line of the rhombic superdielectric resonator radiator array in the y-axis direction, is aligned with the center line of the rectangular slit (12) in the y-axis direction. The center line of the gap formed between the second and third columns of the rhombic superdielectric resonator radiator array, i.e. the center line of the rhombic superdielectric resonator radiator array in the x-axis direction, is aligned with the center line of the rectangular slit (12) in the x-axis direction.
[0011] Furthermore, the working principle of the antenna is as follows: an electromagnetic signal is input from the excitation port (14), and is conducted to the rectangular slot (12) through the rectangular microstrip line (11). The rectangular slot (12) couples the electromagnetic signal to the rhombic superdielectric resonator radiator array, thereby generating broadband circularly polarized radiation.
[0012] Furthermore, the rhombic superdielectric resonator radiator (13) structure is a hexagonal column formed by cutting right-angled sides of a cuboid.
[0013] Furthermore, the dielectric material of the rhombic superdielectric resonator radiator (13) is aluminum oxide with a dielectric constant of 9.8.
[0014] Furthermore, the substrate (10) is made of Rogers RT5880 with a dielectric constant of 2.2 and a loss tangent of 0.0009.
[0015] Furthermore, the rectangular microstrip line (11) is a copper-clad wire with a characteristic impedance of 50 ohms.
[0016] Furthermore, the width of the gap is 0.5 mm.
[0017] The advantages of this invention are:
[0018] The antenna of this invention generates circularly polarized radiation through the coupling between the rhombic superdielectric resonator radiators in the rhombic superdielectric resonator radiator array. The use of rhombic superdielectric resonator radiators provides more design freedom and facilitates the design of circularly polarized radiation, and has a wide axial ratio. At the same time, the antenna of this invention has a simple structure and is easy to manufacture. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the circularly polarized resonator antenna based on a rhombic metadielectric according to the present invention;
[0020] Figure 2 This is a front view of the circularly polarized resonator antenna based on a rhombic metadielectric according to the present invention.
[0021] Figure 3 This is a rear view of the circularly polarized resonator antenna based on a rhombic metadielectric according to the present invention.
[0022] Figure 4 The reflection coefficient curve of the circularly polarized resonator antenna based on the rhombic metadielectric of this invention is shown in the figure.
[0023] Figure 5 The radiation pattern of the circularly polarized resonator antenna based on a rhombic metadielectric at 4.9 GHz in the xoz plane is shown.
[0024] Figure 6 The radiation pattern of the circularly polarized resonator antenna based on a rhombic metadielectric at 4.9 GHz in the yoz plane is shown.
[0025] Figure 7 The radiation pattern of the circularly polarized resonator antenna based on a rhombic metadielectric at 5 GHz in the xoz plane is shown.
[0026] Figure 8 The radiation pattern of the circularly polarized resonator antenna based on a rhombic metadielectric at 5 GHz in the yoz plane is shown.
[0027] Figure 9 This is a graph showing the axial ratio bandwidth of the circularly polarized resonator antenna based on a rhombic metadielectric according to the present invention. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0030] Example 1
[0031] like Figures 1 to 3 As shown, a circularly polarized resonator antenna based on a rhombic metadielectric includes: a substrate (10), a rectangular microstrip line (11), a rectangular slot (12), 14 rhombic metadielectric resonator radiators (13), and an excitation port (14); the substrate (10) is made of Rogers RT5880 with a dielectric constant of 2.2 and a loss tangent of 0.0009; the dielectric material of the rhombic metadielectric resonator radiators (13) is aluminum oxide with a dielectric constant of 9.8.
[0032] like Figure 1 As shown, the substrate (10) is square with a side length of 100mm. The front side of the substrate (10) (the plane in the positive direction of the z-axis) is the ground plane, and the ground plane is covered with copper. The structure of the rhombic superdielectric resonator radiator (13) is a hexagonal column formed by cutting a rectangular prism with a right angle of 6mm from a 12mm×12mm×15mm cuboid.
[0033] like Figure 2As shown, 14 rhombic superdielectric resonator radiators (13) form a 4-row × 4-column rhombic superdielectric resonator radiator array. The two diagonals of the rhombic superdielectric resonator radiator array coincide with the two diagonals of the square substrate (10), and the center lines of the rhombic superdielectric resonator radiator array in the x-axis and y-axis directions coincide with the center lines of the square substrate (10) in the x-axis and y-axis directions, respectively. Each rhombic superdielectric resonator radiator (13) is tilted 45° to the right. Three rhombic superdielectric resonator radiators (13) are arranged in the first and fourth rows, and four rhombic superdielectric resonator radiators (13) are arranged in the second and third rows. Three rhombic superdielectric resonator radiators (13) are arranged in the first and fourth columns, and four rhombic superdielectric resonator radiators (13) are arranged in the second and third columns. The gap between each row and each column is 0.5 mm. The outline shape of the projection of the rhombic superdielectric resonator radiator array on the ground plane is hexagonal.
[0034] like Figure 3 As shown, a rectangular slit (12) is provided in the middle of the front side of the substrate (10). The narrow side (side in the x-axis direction) of the rectangular slit is 2 mm and the long side (side in the y-axis direction) is 27 mm. The center line of the gap formed between the second and third rows of the rhombic superdielectric resonator radiator array, which is the center line of the rhombic superdielectric resonator radiator array in the y-axis direction, is aligned with the center line of the rectangular slit (12) in the y-axis direction. The center line of the gap formed between the second and third columns of the rhombic superdielectric resonator radiator array, which is the center line of the rhombic superdielectric resonator radiator array in the x-axis direction, is aligned with the center line of the rectangular slit (12) in the x-axis direction.
[0035] like Figure 3 As shown, a rectangular microstrip line (11) is disposed on the back side of the substrate (10). The rectangular microstrip line (11) is a copper-clad wire with a characteristic impedance of 50 ohms. The long side (side in the y-axis direction) of the projection of the rectangular slot (12) on the back side of the substrate (10) is perpendicular to the long side of the projection. The lower end (positive x-axis end) of the rectangular microstrip line (11) is aligned with the bottom edge of the substrate (10) and serves as the excitation port (14) of the antenna. The upper end (opposite x-axis end) of the rectangular microstrip line (11) crosses the rectangular slot (12) and extends toward the top edge of the substrate (10).
[0036] The working principle of the antenna is as follows:
[0037] An electromagnetic signal is input from the excitation port (14) and transmitted through the rectangular microstrip line (11) to the rectangular slot (12). The rectangular slot (12) couples the electromagnetic signal to a 4-row × 4-column array of rhombic superdielectric resonators consisting of 14 rhombic superdielectric resonators (13), thereby generating broadband circularly polarized radiation.
[0038] This invention differs from conventional circularly polarized dielectric resonator antenna structures. Instead, it divides traditional dielectric resonator antennas into rhombic superdielectric blocks, which are then arrayed in a rhombic array. Circular polarized radiation is generated through coupling between the elements, achieving circular polarized radiation of the antenna. This results in a wide axial ratio, simple structure, wide impedance bandwidth, and convenient fabrication. Furthermore, it provides new design freedom for circularly polarized dielectric resonator antennas.
[0039] Figure 4 The reflection coefficient of the antenna. Figures 5 to 8 The antenna radiation patterns at different frequencies show left-hand circular polarization radiation, with the radiation pattern showing apical radiation. Figure 5 The radiation pattern of the central antenna in the xoz plane at 4.9 GHz shows left-handed circularly polarized radiation. Figure 6 The radiation pattern of the central antenna in the yoz plane at 4.9 GHz shows left-hand circularly polarized radiation. Figure 7 The radiation pattern of the central antenna in the xoz plane at 5 GHz shows left-handed circularly polarized radiation; Figure 8 The radiation pattern of the central antenna in the yoz plane at 5 GHz shows left-handed circularly polarized radiation.
[0040] Figure 9 The antenna axial ratio bandwidth curve shows that the axial ratio bandwidth less than 3dB is from 4.56GHz to 5.01GHz, and the axial ratio bandwidth percentage is 9.4%.
[0041] Example 2
[0042] Example 1 Figure 2 Each rhombic superdielectric resonator radiator (13) in this embodiment is tilted 45° to the right, and the antenna achieves left-hand circular polarization radiation; the only difference from Embodiment 1 is that each rhombic superdielectric resonator radiator (13) in this embodiment is tilted 45° to the left, and the antenna achieves right-hand circular polarization radiation.
[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such 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 circularly polarized resonator antenna based on a rhombic metadielectric, characterized in that, include: Substrate (10), rectangular microstrip line (11), rectangular slot (12), rhombic superdielectric resonator radiator array, excitation port (14). The front side of the substrate (10) is a ground plane, and a rectangular slot (12) is provided in the middle of the ground plane. A rectangular microstrip line (11) is provided on the back side of the substrate (10). The long side of the projection of the rectangular microstrip line (11) and the rectangular slot (12) on the back side of the substrate (10) are perpendicular to each other. The lower end of the rectangular microstrip line (11) is aligned with the bottom edge of the substrate (10) and serves as the excitation port (14) of the antenna. The upper end of the rectangular microstrip line (11) crosses the rectangular slot (12) and extends towards the top edge of the substrate (10). The rhombic superdielectric resonator radiator array is disposed on the ground surface. The two diagonals of the rhombic superdielectric resonator radiator array coincide with the two diagonals of the substrate (10), and the center lines of the rhombic superdielectric resonator radiator array in the x-axis and y-axis directions coincide with the center lines of the square substrate (10) in the x-axis and y-axis directions, respectively. The outline shape of the projection of the rhombic superdielectric resonator radiator array onto the ground plane is hexagonal; The array of rhombic superdielectric resonators includes 14 rhombic superdielectric resonators (13), which form a 4-row × 4-column rhombic superdielectric resonator array. Each rhombic superdielectric resonator (13) is tilted 45° to the left or right. The first and fourth rows each have 3 rhombic superdielectric resonators (13), the second and third rows each have 4 rhombic superdielectric resonators (13), the first and fourth columns each have 3 rhombic superdielectric resonators (13), the second and third columns each have 4 rhombic superdielectric resonators (13), and the gaps between each row and each column are equal. The center line of the gap formed between the second and third rows of the rhombic superdielectric resonator radiator array, i.e. the center line of the rhombic superdielectric resonator radiator array in the y-axis direction, is aligned with the center line of the rectangular slit (12) in the y-axis direction. The center line of the gap formed between the second and third columns of the rhombic superdielectric resonator radiator array, i.e. the center line of the rhombic superdielectric resonator radiator array in the x-axis direction, is aligned with the center line of the rectangular slit (12) in the x-axis direction. An electromagnetic signal is input from the excitation port (14) and transmitted through the rectangular microstrip line (11) to the rectangular slot (12). The rectangular slot (12) couples the electromagnetic signal to the rhombic superdielectric resonator radiator array. The rhombic array utilizes the coupling between the rhombic superdielectric resonator radiator (13) units to generate broadband circularly polarized radiation.
2. The circularly polarized resonator antenna based on a rhombic metadielectric according to claim 1, characterized in that, The structure of the rhombic superdielectric resonator radiator (13) is a hexagonal column formed by cutting right-angled sides of a cuboid.
3. The circularly polarized resonator antenna based on a rhombic metadielectric according to claim 1, characterized in that, The dielectric material of the rhombic superdielectric resonator radiator (13) is aluminum oxide with a dielectric constant of 9.
8.
4. The circularly polarized resonator antenna based on a rhombic metadielectric according to claim 1, characterized in that, The substrate (10) is made of Rogers RT5880, with a dielectric constant of 2.2 and a loss tangent of 0.0009.
5. The circularly polarized resonator antenna based on a rhombic metadielectric according to claim 1, characterized in that, The rectangular microstrip line (11) is a copper-clad wire with a characteristic impedance of 50 ohms.
6. The circularly polarized resonator antenna based on a rhombic metadielectric according to claim 1, characterized in that, The width of the gap is 0.5 mm.