Circularly polarized broadband antenna based on rotating metasurface

Abstract

The utility model discloses a circularly polarized broadband antenna based on a rotating metasurface. The circularly polarized broadband antenna comprises the rotating metasurface, a dielectric substrate I, a dielectric substrate II, a rectangular patch, a truncated square patch, a metal ground layer and a coaxial feed port, the rotary metasurface is located on the upper surface of the first dielectric substrate and composed of thirty-six rectangular metal patches with chamfers, the rectangular patches and the chamfered square patches are located on the upper surface of the second dielectric substrate, the metal ground layer is located on the lower surface of the second dielectric substrate, the coaxial feed port is connected with the microstrip line on the second dielectric substrate, and the coaxial feed port is connected with the microstrip line on the second dielectric substrate. The groove dug out of the metal ground layer is the outer center of the coaxial feed port. The microwave circularly-polarized wide-axial-ratio antenna provided by the utility model is of a planar structure on the whole, has a low profile, is very simple in structure, is easy to design and optimize, is easy to process, manufacture and integrate, and is favorable for realizing low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of circularly polarized broadband antennas based on rotating metasurfaces, in particular to a circularly polarized broadband antenna based on rotating metasurfaces. Background Art

[0002] Modern wireless communication technology is developing rapidly to meet people's demand for information. Compared with linear polarization antennas that can only receive the same linear polarization waves as it, circular polarization (CP) antennas can receive any linear polarization waves, as well as circular polarization waves, which can avoid polarization loss caused by polarization mismatch between transmitting and receiving antennas. Circular polarization antennas have excellent performance in solving polarization mismatch, suppressing rain and fog interference, and eliminating Faraday effect. Therefore, the research and design of circular polarization antennas in microwave frequency bands is very important. However, most microwave circular polarization antennas currently focus on wide 3-dB axial ratio bandwidths, without smaller volumes to better adapt to the development of wireless communication systems. Utility Model Content

[0003] The technical problem solved by the utility model is to overcome the defects mentioned in the background technology and provide a circularly polarized broadband antenna based on a rotating metasurface.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a circularly polarized broadband antenna based on a rotating metasurface, comprising: a rotating metasurface, a dielectric substrate one, a dielectric substrate two, a rectangular patch, a truncated square patch, a metal stratum, and a coaxial feeding port; the rotating metasurface is located on the upper surface of the dielectric substrate one, the rotating metasurface is composed of thirty-six rectangular metal patches with cut corners, the rectangular patches and the truncated square patches are located on the upper surface of the dielectric substrate two, the metal stratum is located on the lower surface of the dielectric substrate two, the coaxial feeding port is connected to the microstrip line on the dielectric substrate two, and the groove dug out of the metal stratum is the circumcenter of the coaxial feeding port.

[0005] Furthermore, the thickness of the dielectric substrate 1 and the dielectric substrate 2 is 1.524 mm, the length L=32 mm, the double-layer dielectric substrate is Rogers RO4003 dielectric substrate, the dielectric constant is 3.38, and the loss angle of the dielectric substrate is =0.0027.

[0006] Furthermore, the thirty-six metal patches on the rotating metasurface are arranged in a 6*6 layout and are attached to a dielectric substrate after being rotated.

[0007] Furthermore, the rectangular patch is a parasitic patch of a truncated square patch.

[0008] Compared with the prior art, the beneficial effects of the utility model are:

[0009] Currently, many wide-axis ratio antennas have the characteristics of high profile and large volume. However, the microwave circularly polarized wide-axis ratio antenna provided by the utility model is a planar structure with a low profile as a whole. The structure is very simple, easy to design and optimize, easy to process, manufacture and integrate, and is conducive to achieving low cost.

[0010] Compared with a wide axial ratio antenna with the same planar structure, the antenna provided by the utility model has a wider axial ratio bandwidth, that is, it has a stable radiation gain within a wider bandwidth range, and the 3-dB axial ratio bandwidth can cover the 4.9-6.4 GHz frequency band of satellite communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of a three-dimensional structure provided by the utility model;

[0012] Figure 2 A second top view of the dielectric substrate provided by the utility model;

[0013] Figure 3 A schematic diagram of the upper surface structure of a dielectric substrate provided by the utility model;

[0014] Figure 4 A cross-sectional view of the antenna provided by the utility model;

[0015] Figure 5 A schematic diagram of the S11 parameters of the antenna provided by the utility model;

[0016] Figure 6 A schematic diagram of the axial ratio parameters of the antenna provided by the utility model;

[0017] Figure 7 A gain schematic diagram of the antenna provided by the utility model;

[0018] Figure 8 The antenna provided by the utility model is at a frequency of 5.1 GHz. xoz Radiation pattern of a plane;

[0019] Fig. 9 The antenna provided by the utility model is at a frequency of 5.1 GHz. yoz Radiation pattern of a plane;

[0020] Fig.10 The antenna provided by the utility model is at a frequency of 6.1 GHz. xoz Radiation pattern of a plane;

[0021] Fig.11 The antenna provided by the utility model is at a frequency of 6.1 GHz. yoz Radiation pattern of a plane.

[0022] Numbers in the figure:

[0023] 1. Dielectric substrate one; 2. Dielectric substrate two; 3. Rotating metasurface; 4. Metal formation; 5. Coaxial feeding port; 6. Truncated square patch; 7. Rectangular patch. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-11 The utility model provides a technical solution: a circularly polarized broadband antenna based on a rotating metasurface, comprising: a rotating metasurface 3, a dielectric substrate 1, a dielectric substrate 2, a rectangular patch 7, a truncated square patch 6, a metal layer 4, and a coaxial feeding port 5; the rotating metasurface 3 is located on the upper surface of the dielectric substrate 1, the rotating metasurface 3 is composed of thirty-six rectangular metal patches with cut corners, the rectangular patch 7 and the truncated square patch 6 are located on the upper surface of the dielectric substrate 2, the metal layer 4 is located on the lower surface of the dielectric substrate 2, the coaxial feeding port 5 is connected to the microstrip line on the dielectric substrate 2, and the groove dug out of the metal layer 4 is the circumcenter of the coaxial feeding port 5.

[0026] The thickness of dielectric substrate 1 and dielectric substrate 2 is 1.524 mm, the length L=32 mm, the double-layer dielectric substrate is Rogers RO4003 dielectric substrate, the dielectric constant is 3.38, and the loss angle of the dielectric substrate is =0.0027.

[0027] like Figure 3 As shown; thirty-six metal patches on the rotating metasurface 3 are arranged in a 6*6 layout and are attached to the dielectric substrate 1 after rotation. The metal patch unit is Lt×Lt, the cutting angles are b11, b12, b13, and the gap between two adjacent units is g, where g=0.3mm, Lt=7.2mm, b11=1.2mm, b12=1.5mm, b13=0.3mm, θ=108°, and the rectangular patch 7 is a parasitic patch of the truncated square patch 6.

[0028] The truncated square patch 6 can generate orthogonal currents and a phase difference of 90°, so the antenna can generate circular polarization. However, the circular polarization bandwidth of the antenna is narrow at this time. The addition of the rotating metasurface 3 and the rectangular patch 7 introduces new circular polarization resonance points due to the coupling effect, thereby greatly widening the circular polarization axial ratio bandwidth of the antenna. The -10-dBS11 bandwidth of the antenna can cover the 4.72-7.67GHz frequency band, and the 3-dB axial ratio bandwidth is 4.97-6.48GHz. The relative bandwidth is 26.3%, which can cover the C-band satellite communication 4-8GHz frequency band.

[0029] like Figure 2 As shown: Among them, the size of the dielectric substrate 2 L = L =32mm, truncated square patch 6, size P×P, truncated angles q, q1, q2, q3, in order to expand the potential AR bandwidth, a parasitic rectangular patch 7 with a size of b1×b1 is placed next to the truncated square patch. An extension band with a size of s×wf is added to the truncated square patch to improve impedance matching. The truncated square patch 6 and the parasitic rectangular patch 7 are printed on the dielectric substrate 2, the outer part of the SMA connector is connected to the ground plane, the inner part extends through the dielectric substrate 2 and is connected to the driving patch of the feeding point, and the feeding point is far away from the center of the patch fx; where P=13mm, q=7.5mm, q1=1mm, q2=7mm, q3=8mm, s=4mm, wf=1.9mm, b1=5.7mm, fx=8mm.

[0030] like Figure 5 As shown in the figure, the -10-dB bandwidth is 4.72-7.67 GHz, and the relative bandwidth is 47.9%.

[0031] like Figure 6 As shown in the figure, its 3-dB axial ratio bandwidth is 4.97-6.48GHz. The relative bandwidth is 26.3%. It can cover the 4-8GHz frequency band of C-band satellite communication. The 3-dB axial ratio bandwidth is also the circular polarization bandwidth. The result shows that the antenna can radiate circularly polarized electromagnetic waves within the bandwidth range of 4.97-6.48GHz.

[0032] like Figure 7 As shown; it can be observed that it has a stable left-hand circular polarization gain and a very small right-hand circular polarization gain. The antenna radiates left-hand circular polarization waves.

[0033] like Figure 8 As shown; the antenna is at + z It radiates left-hand circularly polarized waves in the same direction and shows obvious unidirectional radiation characteristics. The right-hand circularly polarized waves are very small compared to the left-hand circularly polarized waves and can be ignored.

[0034] like Fig. 9 As shown; the antenna is at + z It radiates left-hand circularly polarized waves in the same direction and shows obvious unidirectional radiation characteristics. The right-hand circularly polarized waves are very small compared to the left-hand circularly polarized waves and can be ignored.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circularly polarized broadband antenna based on a rotating metasurface, characterized in that: include: A rotating metasurface (3), a dielectric substrate one (1), a dielectric substrate two (2), a rectangular patch (7), a truncated square patch (6), a metal stratum (4), and a coaxial feeding port (5); the rotating metasurface (3) is located on the upper surface of the dielectric substrate one (1), the rotating metasurface (3) is composed of thirty-six rectangular metal patches with cut corners, the rectangular patch (7) and the truncated square patch (6) are located on the upper surface of the dielectric substrate two (2), the metal stratum (4) is located on the lower surface of the dielectric substrate two (2), the coaxial feeding port (5) is connected to a microstrip line on the dielectric substrate two (2), and the groove dug out of the metal stratum (4) is the circumcenter of the coaxial feeding port (5).

2. The circularly polarized broadband antenna based on a rotating metasurface according to claim 1, characterized in that: The thickness of the dielectric substrate 1 (1) and the dielectric substrate 2 (2) is 1.524 mm, and the length L is 32 mm. The double-layer dielectric substrate is a Rogers RO4003 dielectric substrate with a dielectric constant of 3.38 and a loss angle of the dielectric substrate. =0.0027.

3. The circularly polarized broadband antenna based on a rotating metasurface according to claim 2, characterized in that: Thirty-six metal patches on the rotating metasurface (3) are arranged in a 6*6 pattern and are attached to a dielectric substrate (1) after being rotated.

4. The circularly polarized broadband antenna based on a rotating metasurface according to claim 3, characterized in that: The rectangular patch (7) is a parasitic patch of the truncated square patch (6).

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