A microstrip slot-fed broadband metamaterial resonator antenna

Abstract

This invention relates to a microstrip slot-fed broadband metadielectric resonator antenna, belonging to the field of metamaterial antenna technology. It addresses the problem of designing a microstrip slot-fed broadband metadielectric resonator antenna with wide impedance bandwidth, flat gain curve, and simple structure. The antenna receives an RF signal from the excitation port, which is then conducted through a rectangular microstrip line to a rectangular slot. The rectangular slot then conducts the RF signal to a rectangular metadielectric resonator radiator array. Multimode resonance is generated by the coupling between the rectangular metadielectric resonator radiator elements, thereby increasing the impedance bandwidth. The signal radiates from the top of the rectangular metadielectric resonator radiator array. The antenna exhibits a flat gain curve, superior performance, and advantages such as simple structure and easy fabrication.

Description

Technical Field

[0001] This invention belongs to the field of metamaterial antenna technology and relates to a microstrip slot-fed broadband metadielectric resonator antenna. Background Technology

[0002] With the rapid development of 5G and 6G communication technologies, antennas, one of the important transmitting and receiving components in wireless communication equipment, also need to adapt to higher performance specifications. Dielectric resonator antennas have been developed extensively and are widely used in various military and commercial applications due to their simple structure, small planar size, and wide bandwidth.

[0003] 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.

[0004] Based on dielectric resonator antennas, many improved structures have been developed to extend their impedance bandwidth, but their structural design remains complex, difficult to manufacture, and costly. Summary of the Invention

[0005] The purpose of this invention is to design a microstrip slot-fed broadband metadielectric resonator antenna with a wide impedance bandwidth, a flat gain curve, and a simple structure.

[0006] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0007] A microstrip slot-fed broadband metadielectric resonator antenna includes: a substrate (10), a rectangular microstrip line (11), a rectangular slot (12), 16 rectangular metadielectric resonator radiators (13), and an excitation port (14).

[0008] The substrate (10) is square, and the front side of the substrate (10) is the ground plane, which is entirely covered with copper. The rectangular superdielectric resonator radiator (13) is cuboid. Sixteen rectangular superdielectric resonator radiators (13) form a rectangular superdielectric resonator radiator array of 4 rows × 4 columns. The gap between each row and each column is 1 mm. The two diagonals of the rectangular superdielectric resonator radiator array coincide with the two diagonals of the square substrate (10). The center lines of the rectangular 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.

[0009] A rectangular slot (12) is provided in the middle of the ground plane of the substrate (10). The center line of the gap formed between the second and third rows of the rectangular superdielectric resonator radiator array, i.e. the center line of the rectangular superdielectric resonator radiator array in the y-axis direction, is aligned with the center line of the rectangular slot (12) in the y-axis direction. The center line of the gap formed between the second and third columns of the rectangular superdielectric resonator radiator array, i.e. the center line of the rectangular superdielectric resonator radiator array in the x-axis direction, is aligned with the center line of the rectangular slot (12) in the x-axis direction.

[0010] A rectangular microstrip line (11) is disposed 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 perpendicularly intersected. 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).

[0011] Furthermore, the working principle of the antenna is as follows: the radio frequency 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) conducts the radio frequency signal to the rectangular superdielectric resonator radiator array. Multimode resonance is generated by the coupling between the units of the rectangular superdielectric resonator radiator (13), thereby improving the impedance bandwidth and radiating it from the top of the rectangular superdielectric resonator radiator array.

[0012] Furthermore, the substrate (10) is made of Rogers RT5880 with a dielectric constant of 2.2 and a loss tangent of 0.0009.

[0013] Furthermore, the dielectric material of the rectangular superdielectric resonator radiator (13) is aluminum oxide with a dielectric constant of 9.8.

[0014] Furthermore, the narrow side of the rectangular slit is 2mm and the long side is 27mm.

[0015] Furthermore, the rectangular microstrip line (11) is a copper-clad wire with a characteristic impedance of 50 ohms.

[0016] The advantages of this invention are:

[0017] This invention differs from ordinary dielectric resonator antenna design. Instead, it divides the traditional dielectric resonator antenna into blocks to form a superdielectric resonator. The radio frequency signal is input from the excitation port (14) and conducted to the rectangular slot (12) through the rectangular microstrip line (11). The rectangular slot (12) conducts the radio frequency signal to the rectangular superdielectric resonator radiator array. Multimode resonance is generated by the coupling between the units of the rectangular superdielectric resonator radiator (13), thereby improving the impedance bandwidth and radiating it from the top of the rectangular superdielectric resonator radiator array. The antenna has a flat gain curve, excellent performance, and the advantages of simple structure and convenient processing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention;

[0019] Figure 2 This is a front view of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention.

[0020] Figure 3 This is a rear view of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention;

[0021] Figure 4 The reflection coefficient curve of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention is shown.

[0022] Figure 5 The radiation pattern of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention at 2 GHz;

[0023] Figure 6 The radiation pattern of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention at 2.2 GHz is shown.

[0024] Figure 7 The radiation pattern of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention at 2.5 GHz is shown.

[0025] Figure 8 This is a gain curve of the microstrip slot-fed broadband metadielectric resonator antenna of the present invention within its bandwidth. Detailed Implementation

[0026] 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.

[0027] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0028] Example 1

[0029] like Figures 1 to 3 As shown, a microstrip slot-fed broadband metadielectric resonator antenna includes: a substrate (10), a rectangular microstrip line (11), a rectangular slot (12), 16 rectangular 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 rectangular metadielectric resonator radiators (13) is aluminum oxide with a dielectric constant of 9.8.

[0030] like Figure 1 As shown, the substrate (10) is square with a side length of 100mm. The front side (plane in the positive direction of the z-axis) of the substrate (10) is the ground plane, and the ground plane is entirely covered with copper. The rectangular superdielectric resonator radiator (13) is a cuboid with dimensions of 12mm×12mm×15mm.

[0031] like Figure 2 As shown, 16 rectangular superdielectric resonator radiators (13) form a rectangular superdielectric resonator radiator array of 4 rows × 4 columns. The gap between each row and each column is 1 mm. The two diagonals of the rectangular superdielectric resonator radiator array coincide with the two diagonals of the square substrate (10). The center lines of the rectangular 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.

[0032] like Figure 3 As shown, a rectangular slit (12) is provided in the middle 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 rectangular superdielectric resonator radiator array, i.e. the center line in the y-axis direction of the rectangular superdielectric resonator radiator array, is aligned with the center line in the y-axis direction of the rectangular slit (12). The center line of the gap formed between the second and third columns of the rectangular superdielectric resonator radiator array, i.e. the center line in the x-axis direction of the rectangular superdielectric resonator radiator array, is aligned with the center line in the x-axis direction of the rectangular slit (12).

[0033] like Figure 3As 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 towards the top edge of the substrate (10).

[0034] The working principle of the antenna is as follows:

[0035] The RF signal is input from the excitation port (14) and transmitted to the rectangular slot (12) through the rectangular microstrip line (11). The rectangular slot (12) transmits the RF signal to the rectangular superdielectric resonator radiator array. Multimode resonance is generated by the coupling between the units of the rectangular superdielectric resonator radiator (13), thereby improving the impedance bandwidth and radiating it from the top of the rectangular superdielectric resonator radiator array. The antenna has a flat gain curve, excellent performance, and also has the advantages of simple structure and convenient processing.

[0036] Figure 4 The image shows the reflection coefficient curve of the antenna, with a frequency band from 2 GHz to 2.7 GHz and an impedance bandwidth of approximately 30%. Figures 5 to 8 The antenna radiation patterns at different frequencies are shown. Figure 5 The antenna's radiation pattern at 2 GHz. Figure 6 The image shows the radiation pattern of the antenna at 2.2 GHz. Figure 7 The radiation pattern of the antenna at 2.5 GHz shows that all patterns exhibit apical radiation characteristics. Figure 8 The image shows the antenna gain curve within the bandwidth. The gain curve is flat, indicating stable performance.

[0037] 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 microstrip slot-fed broadband metadielectric resonator antenna, characterized in that, include: Substrate (10), rectangular microstrip line (11), rectangular slot (12), 16 rectangular superdielectric resonator radiators (13), excitation port (14). The substrate (10) is square, and the front side of the substrate (10) is the ground plane. The ground plane is entirely covered with copper. The rectangular superdielectric resonator radiator (13) is cuboid. Sixteen rectangular superdielectric resonator radiators (13) form a rectangular superdielectric resonator radiator array of 4 rows × 4 columns. The gap between each row and each column is 1 mm. The two diagonals of the rectangular superdielectric resonator radiator array coincide with the two diagonals of the square substrate (10). The center lines of the rectangular 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. A rectangular slot (12) is provided in the middle of the ground plane of the substrate (10). The center line of the gap formed between the second and third rows of the rectangular superdielectric resonator radiator array, i.e. the center line of the rectangular superdielectric resonator radiator array in the y-axis direction, is aligned with the center line of the rectangular slot (12) in the y-axis direction. The center line of the gap formed between the second and third columns of the rectangular superdielectric resonator radiator array, i.e. the center line of the rectangular superdielectric resonator radiator array in the x-axis direction, is aligned with the center line of the rectangular slot (12) in the x-axis direction. A rectangular microstrip line (11) is disposed on the back side of the substrate (10). The long side of the projection of the rectangular microstrip line (11) onto the back side of the substrate (10) is perpendicular to the long side of the rectangular slot (12). 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 toward the top edge of the substrate (10). The radio frequency signal is input from the excitation port (14) and transmitted to the rectangular slot (12) through the rectangular microstrip line (11). The rectangular slot (12) transmits the radio frequency signal to the rectangular superdielectric resonator radiator array. Multimode resonance is generated by the coupling between the units of the rectangular superdielectric resonator radiator (13), thereby increasing the impedance bandwidth and radiating it from the top of the rectangular superdielectric resonator radiator array.

2. The microstrip slot-fed broadband metadielectric resonator antenna 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.

3. The microstrip slot-fed broadband metadielectric resonator antenna according to claim 1, characterized in that, The dielectric material of the rectangular superdielectric resonator radiator (13) is aluminum oxide with a dielectric constant of 9.

8.

4. The microstrip slot-fed broadband metadielectric resonator antenna according to claim 1, characterized in that, The narrow side of the rectangular slit is 2mm, and the long side is 27mm.

5. A microstrip slot-fed broadband metadielectric resonator antenna according to claim 1, characterized in that, The rectangular microstrip line (11) is a copper-clad wire with a characteristic impedance of 50 ohms.

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