Differential disc-fed cross-shaped patch circularly polarized antenna based on inverted-f structure

Abstract

The present invention provides a differential disk-fed Taiji diagram-shaped patch circularly polarized antenna based on an inverted-F structure in the technical field of microwave antennas, which includes a radiator, a dielectric substrate, a metal through-hole, a differential feeding probe with a loaded disk, and a ground plane. The radiator is connected to the upper surface of the first-layer dielectric substrate, and the radiator is connected to the metal through-hole. The metal through-hole penetrates through the first-layer and second-layer dielectric substrates and is connected to the ground plane; the differential probe feeds the radiator through a disk at the top, and the bottom of the differential feeding probe forms a feeding port with the ground plane. The present invention improves the function of the circularly polarized antenna and designs a differential disk-fed Taiji diagram-shaped patch circularly polarized antenna based on an inverted-F structure, realizing the characteristics of high gain, wide bandwidth, and wide axial ratio.

Description

Technical Field

[0001] This invention relates to the field of microwave antenna technology, and more specifically, to a differential disk-fed taiji-patterned circularly polarized antenna based on an inverted F structure. Background Technology

[0002] The polarization of electromagnetic waves characterizes the time-varying properties of the spatial electric field intensity vector. Based on different polarization methods, antennas can be classified into linearly polarized antennas, circularly polarized antennas, and elliptically polarized antennas. Circularly polarized antennas evolved from linearly polarized antennas. A circularly polarized antenna refers to an antenna whose instantaneous electric field trajectory is a circle. According to the propagation direction, circular polarization is further divided into left-handed and right-handed circular polarization. The principle of realizing a circularly polarized antenna is to generate two spatially orthogonal linearly polarized components with equal amplitude and a 90° phase difference. Circularly polarized antennas are widely used in radar, electronic countermeasures, reconnaissance and jamming, communication, remote sensing, and telemetry. Therefore, modern communication systems need to achieve stable communication under complex environments and conditions, which places high demands on the stability and anti-interference capabilities of antennas. Circularly polarized antennas possess many unique properties. They can accept electromagnetic waves of arbitrary polarization, thus avoiding polarization loss, and can suppress multipath scattering and multipath interference, while also avoiding the Faraday rotation effect. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a differential disk-fed taiji-patterned circularly polarized antenna based on an inverted F structure.

[0004] According to the present invention, a differential disk-fed taiji-shaped patch circularly polarized antenna based on an inverted F structure includes a radiator, a dielectric substrate, a metal via, a metal differential feed probe with a loading disk, and a ground plane. The radiator is placed on the upper surface of the dielectric substrate, and the metal differential feed probe is coupled to the radiator through the disk. The metal differential feed probe is connected to the lower surface of the dielectric substrate and forms an excitation port with the ground plane. The metal via penetrates the dielectric substrate and connects to the metal surface of the upper surface of the first dielectric substrate. The lower side of the second dielectric substrate is connected to the ground plane, forming a cavity structure with a metal enclosure.

[0005] One end of the short-circuit post is connected to the radiator, and the other end is connected to the ground plane.

[0006] Preferably, the bottom of the differential feed probe and the ground plane constitute the excitation port.

[0007] Preferably, the radiator is placed on the first dielectric layer, and the metal plane is connected to the first dielectric substrate.

[0008] Preferably, the dielectric substrate includes a first dielectric layer and a second dielectric layer, the first dielectric layer is connected to the upper side of the second dielectric layer, the metal via is inside the first dielectric layer and the second dielectric layer, the metal ground plane is located on the upper surface of the first dielectric layer, and the ground plane is located on the lower side of the second dielectric layer.

[0009] Preferably, the first dielectric layer and the second dielectric layer are cubes;

[0010] Width of the first dielectric layer and the second dielectric layer S x =12mm, length S y =12mm, thickness h1 =1.321mm h 1 = 0.254 mm, dielectric constant r =2.2;

[0011] Loss angle of the first dielectric layer and the second dielectric layer tan δ =0.0009.

[0012] Preferably, the ground plane is square, and the width of the ground plane is... g x = S x =12mm, length is g y = S y =12mm.

[0013] Preferably, the short-circuit post connects the radiator and the ground plane below the second dielectric layer.

[0014] Preferably, the radiator is in the shape of a yin-yang symbol.

[0015] Preferably, the radiator includes an arc-shaped patch that is fed via a disk-coupled differential feed probe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) This invention improves the function of the circularly polarized antenna and designs a differential disk-fed Taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure. The simulation results show that it achieves the characteristics of high gain of 9.37dBi, wide impedance bandwidth of about 15.74% (26.87GHz-31.46GHz) and wide axial ratio bandwidth of about 14.75% (26.94GHz-31.23GHz);

[0018] (2) Compared with the previous circular polarization scheme, the present invention adopts an inverted F structure, which expands the degree of freedom of antenna impedance matching design, and differential excitation makes the antenna pattern more symmetrical. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of the present invention;

[0021] Figure 2 This is a top view of the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the dielectric layer 1 of the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of the present invention;

[0023] Figure 4 This is a diagram of the probe feeding structure for the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of the present invention.

[0024] Figure 5 This is a three-dimensional structural diagram of the dielectric layer 2 of the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of the present invention.

[0025] Figure 6 This is a differential reflection coefficient curve of the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of the present invention;

[0026] Figure 7 This is a graph showing the axial ratio of the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of this invention.

[0027] Figure 8 This is the far-field diagram of the differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on the inverted F structure of the present invention.

[0028] Numbering on the map:

[0029] Radiator 1, Metal floor 2, First dielectric layer 3, Metal via 4, Second dielectric layer 5, Disk 6, Metal differential feed probe 7, Ground plane 8, Short-circuit post 9, Differential port 10. Detailed Implementation

[0030] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0031] Example

[0032] According to the present invention, a differential disk-fed taiji-shaped patch circularly polarized antenna based on an inverted F structure is provided, wherein a spatial rectangular coordinate system o-xyz is defined, including: an origin o, an x-axis, a y-axis, and a z-axis; the dielectric substrate is parallel to the xoy plane of the spatial rectangular coordinate system o-xyz. Figure 1-5 As shown, the structure includes a radiator 1, a dielectric substrate, a metal via 4, a metal differential feed probe 7, a shorting post 9, and a ground plane 8. The radiator 1 is connected to the upper surface of the dielectric substrate and is fed through a disk 6 on the differential feed probe 7. The bottom of the differential feed probe 7 and the ground plane under the dielectric substrate form a feed port 10. The metal via 4 penetrates the dielectric substrate, forming a cavity structure with a metal enclosure. The ground plane 8 is square, and its width is g. x = S x =40mm, length is g y = S y =40mm. One end of the shorting post 4 is connected to the radiator 1, and the other end is connected to the ground plane 8. The metal differential feed probe 7 couples and feeds the radiator 1 through the metal disk 6, which is located on the upper surface of the second medium. The radiator 1 is placed on the upper surface of the first medium, and the metal ground plate 2 is connected to the ground plane 8 through the metal through-hole 4. The radiator 1 is connected to the ground plane 8 through the shorting post 9. The radiator 1 includes an arc-shaped patch, which is composed of... Figure 2 As shown, r1=2.2mm, r2=0.35mm, r3=1.9mm, r4=1.54mm, r0=5.4mm, and the arc-shaped patch is fed through the disk 6 on the differential feed probe 7.

[0033] The dielectric substrate includes a first dielectric layer 3 and a second dielectric layer 5. The first dielectric layer 3 is connected to the upper side of the second dielectric layer 5. A metal via 4 is located within the first dielectric layer 3 and the second dielectric layer 5. A metal ground plane 2 is located on the upper surface of the first dielectric layer 3, and a ground plane 8 is located on the lower surface of the second dielectric layer 5. The first dielectric layer 3 and the second dielectric layer 5 are cubic. The width of the first dielectric layer 3 and the second dielectric layer 5 are... S x =12mm, length S y =12mm, total thickness of the antenna h =1.575mm, can be divided into thicknesses h1 =1.321mm and h2 =0.254mm, its dielectric constant r =2.2; the loss angles of the first dielectric layer 3 and the second dielectric layer 5 are both tan θ. δ=0.0009.

[0034] like Figure 6-7 As shown, the differential reflection coefficient results and axial ratio of the present invention are presented. Figure 6 The impedance bandwidth with a reflection coefficient less than -10dB is marked as approximately 15.74% (26.87GHz-31.46GHz). Figure 7 The axial ratio bandwidth of less than 3dB is approximately 14.75% (26.94GHz-31.23GHz), indicating that this antenna has a broadband effect.

[0035] like Figure 8 As shown, the far-field diagram of the differential disk-fed taiji pattern patch circularly polarized antenna based on the inverted F structure of the present invention is shown. The gain of approximately 9.37 dBi is marked in the figure. A single antenna element achieves high gain and the radiation pattern is more symmetrical.

[0036] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on an inverted F structure, characterized in that, The device includes a radiator (1), a first dielectric layer (3), a metal via (4), a second dielectric layer (5), a disk (6), a metal differential feed probe (7), and a ground plane (8). The first dielectric layer (3) is connected to the upper side of the second dielectric layer (5), and one end of a short-circuit post (9) is connected to the radiator (1), while the other end of the short-circuit post (9) is connected to the ground plane (8). The radiator (1) is placed on the upper surface of the first dielectric layer (3). The top of the metal differential feed probe (7) is coupled to the feed radiator (1) through the disk (6). The bottom of the metal differential feed probe (7) and the ground plane (8) on the lower surface of the second dielectric layer (5) form a feed port (10). One end of the metal through hole (4) is connected to the metal floor (2) on the upper surface of the first medium layer (3). The metal through hole (4) passes through the first medium layer (3) and the second medium layer (5) and connects to the ground plane (8), forming a cavity structure of a metal fence structure. The radiator (1) is in the shape of a yin-yang symbol.

2. The differential disk-fed taiji diagram patch circularly polarized antenna based on an inverted F structure according to claim 1, characterized in that, The first dielectric layer (3) and the second dielectric layer (5) are cubes; Width of the first dielectric layer (3) and the second dielectric layer (5) S x =12mm, length S y =12mm, thicknesses of 1.321mm and 0.254mm respectively, dielectric constant r =2.2; The loss angle tan θ of the first dielectric layer (3) and the second dielectric layer (5) δ =0.0009.

3. The differential disk-fed taiji diagram-shaped patch circularly polarized antenna based on an inverted F structure according to claim 1, characterized in that, The ground plane (8) is square, and the width of the ground plane (8) is 12mm and the length is 12mm.

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