A dual-frequency circularly polarized wide-axis ratio beam antenna

Abstract

The present invention discloses a dual-frequency circularly polarized wide axial ratio beam antenna, and relates to the field of wide axial ratio beam antennas. The present invention realizes the dual-frequency radiation of the antenna by adopting a single coaxial feeding probe to feed the first rectangular metal patch and the second rectangular metal patch at the same time; corner cuts and rectangular branches are respectively arranged on the first rectangular metal patch and the second rectangular metal patch, so that the first rectangular metal patch and the second rectangular metal patch respectively generate orthogonal fields, thereby generating circular polarization with opposite rotation directions in the low-frequency and high-frequency bands, and realizing dual circular polarization characteristics. The design of center feeding increases the overlap of the antenna phase center, enhances the stability of the antenna phase center, and further increases the axial ratio beam width of the antenna, thereby improving the anti-interference ability of the dual-frequency circularly polarized wide axial ratio beam antenna, and ensuring the communication quality of the dual-frequency circularly polarized wide axial ratio beam antenna.

Description

Technical Field

[0001] The invention belongs to the field of wide axial ratio beam antennas, and in particular relates to a dual-frequency circularly polarized wide axial ratio beam antenna. Background Art

[0002] With the continuous development and popularization of wireless communication technology, wireless communication has become one of the widely used communication means in life. In wireless communication, the antenna is the signal transmission device of the wireless communication system, and its performance affects the communication quality and stability of the wireless communication system. As a special antenna, the circularly polarized antenna can receive and radiate circularly polarized waves, thus having strong anti-interference ability. Circularly polarized antennas can suppress multipath effects, thereby reducing the impact of interference signals in different directions and different polarization states on the main signal, so they are widely used in navigation and radio frequency identification systems.

[0003] In navigation systems, in order to improve the coverage of communications, it is usually required that the axial ratio beam width of the antenna is as wide as possible. However, most of the current antennas do not clearly specify the axial ratio beam width and half-power beam width, and the gain is low. In addition, the existing wide axial ratio beam dual-frequency circularly polarized antenna has a complex feeding structure, large size, and a narrow beam. Therefore, a new dual-frequency circularly polarized wide axial ratio beam antenna is urgently needed to solve the defects of the existing technology. Summary of the invention

[0004] The present invention aims to provide a dual-frequency circularly polarized wide axial ratio beam antenna to solve the above-mentioned technical problems. The dual-frequency characteristics are realized by feeding two layers of patches through a coaxial feeding probe, and dual circular polarization is realized by introducing cut corners and rectangular branches. By realizing the dual-frequency characteristics and dual circular polarization, the axial ratio beam width of the antenna is widened and the phase center stability is improved, thereby improving the anti-interference ability of the antenna.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a dual-frequency circularly polarized wide-axis ratio beam antenna, comprising: a first dielectric substrate, a second dielectric substrate, a first rectangular metal patch, a second rectangular metal patch and a coaxial feeding probe;

[0006] Wherein, the first dielectric substrate is arranged below the second dielectric substrate;

[0007] The first rectangular metal patch is disposed between the first dielectric substrate and the second dielectric substrate;

[0008] The second rectangular metal patch is arranged on the upper surface of the second dielectric substrate;

[0009] The coaxial feeding probe is arranged at the center of the dual-frequency circularly polarized wide axial ratio beam antenna;

[0010] The inner conductor of the coaxial feeding probe passes through the first dielectric substrate and is electrically connected to the first rectangular metal patch, and passes through the second dielectric substrate and is electrically connected to the second rectangular metal patch, so that the coaxial feeding probe feeds the first rectangular metal patch and the second rectangular metal patch;

[0011] The four diagonal corners of the first rectangular metal patch are respectively provided with a first cut angle, a second cut angle, a third cut angle and a fourth cut angle; the first cut angle and the fourth cut angle constitute a first cut angle group, and the second cut angle and the third cut angle constitute a second cut angle group, so that the first cut angle group and the second cut angle group are placed orthogonally, thereby realizing the left-handed circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna;

[0012] The first rectangular branch, the second rectangular branch, the fifth cut angle and the sixth cut angle are respectively arranged on the four diagonals of the second rectangular metal patch; the first rectangular branch and the second rectangular branch constitute a rectangular branch group, and the fifth cut angle and the sixth cut angle constitute a third cut angle group, so that the rectangular branch group and the third cut angle group are placed orthogonally, thereby realizing the right-handed circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna.

[0013] It can be understood that, compared with the prior art, the present invention realizes the dual-frequency radiation of the antenna by using a single coaxial feeding probe to feed the first rectangular metal patch and the second rectangular metal patch at the same time; corner cuts and rectangular branches are respectively set on the first rectangular metal patch and the second rectangular metal patch, so that the first rectangular metal patch and the second rectangular metal patch respectively generate orthogonal fields, thereby generating circular polarization with opposite rotation directions in the low-frequency and high-frequency bands, and realizing dual circular polarization characteristics. The design of center feeding increases the overlap of the antenna phase center, enhances the stability of the antenna phase center, and further increases the axial ratio beam width of the antenna, thereby improving the anti-interference ability of the dual-frequency circularly polarized wide axial ratio beam antenna, and ensuring the communication quality of the dual-frequency circularly polarized wide axial ratio beam antenna.

[0014] As a preferred solution, the first cutting angle and the fourth cutting angle are equal in size and symmetrical about the center; the second cutting angle and the third cutting angle are equal in size and symmetrical about the center.

[0015] As a preferred solution, the width of the first cut corner and the fourth cut corner is 8 mm; the width of the second cut corner and the third cut corner is 3 mm.

[0016] As a preferred solution, the first cutting angle group and the second cutting angle group are placed orthogonally to achieve left-hand circularly polarized waves of the antenna, specifically including:

[0017] The first cutting angle group is placed orthogonally to the second cutting angle group, and the widths of the first cutting angle group and the second cutting angle group are combined to generate a pair of orthogonal modes on the first rectangular metal patch, so that the orthogonal electric field amplitudes of the dual-frequency circularly polarized wide axial ratio beam antenna are equal and differ by 90 degrees, thereby realizing the left-handed circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna.

[0018] This preferred solution sets two pairs of cut angles of equal size and central symmetry, and places the two pairs of cut angles orthogonally. By controlling the sizes of the two pairs of cut angles, the perturbation can separate a pair of orthogonal modes on the first rectangular metal patch, so that the far-field orthogonal electric field amplitudes of the antenna are equal and differ by 90 degrees within a wide-angle range, thereby realizing left-handed circularly polarized waves in the low-frequency band.

[0019] As a preferred solution, the first rectangular branch node and the second rectangular branch node are equal in size and symmetrical in center; the fifth cut angle and the sixth cut angle are equal in size and symmetrical in center.

[0020] As a preferred solution, the width of the first rectangular branch and the second rectangular branch is 5 mm; the width of the fifth cut corner and the sixth cut corner is 4.9 mm.

[0021] As a preferred solution, the first cutting angle group and the second cutting angle group are placed orthogonally to achieve right-hand circularly polarized waves of the antenna, specifically including:

[0022] The rectangular branch group is placed orthogonally to the third cut corner group, and the width of the rectangular branch group and the third cut corner group are combined to generate a pair of orthogonal modes on the second rectangular metal patch, so that the orthogonal electric field amplitudes of the dual-frequency circularly polarized wide axis ratio beam antenna are equal and differ by 90 degrees, thereby realizing the right-handed circularly polarized wave of the dual-frequency circularly polarized wide axis ratio beam antenna.

[0023] This preferred solution sets a pair of rectangular branches and a pair of cut corners of equal size and central symmetry, and places the pair of rectangular branches and the pair of cut corners orthogonally. By controlling the sizes of the rectangular branches and the cut corners, the perturbation can separate a pair of orthogonal modes on the second rectangular metal patch, so that the far-field orthogonal electric field amplitudes of the antenna are equal and differ by 90 degrees within a wide-angle range, thereby realizing right-handed circularly polarized waves in the high-frequency band.

[0024] As a preferred embodiment, the first rectangular metal patch includes: a first annular crack; the second rectangular metal patch includes: a second annular crack; the first annular crack is arranged at the center position of the upper surface of the first rectangular metal patch; the second annular crack is arranged at the center position of the upper surface of the second rectangular metal patch.

[0025] As a preferred solution, both the first annular crack and the second annular crack have the coaxial feeding probe as the center; the inner and outer radii and crack angles of the first annular crack and the second annular crack are different.

[0026] This preferred solution realizes the dual-frequency characteristic of the dual-frequency circularly polarized wide-axis ratio beam antenna by setting a first annular crack and a second annular crack, and by using the inner and outer radii and crack angles of the first annular crack and the second annular crack.

[0027] As a preferred solution, the outer conductor of the coaxial feeding probe is connected to the lower surface of the first dielectric substrate; and a metal floor is provided on the lower surface of the first dielectric substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : A schematic structural diagram of a dual-frequency circularly polarized wide-axis ratio beam antenna provided in an embodiment of the present invention;

[0029] Figure 2 : A side view of a dual-frequency circularly polarized wide axial ratio beam antenna provided by an embodiment of the present invention;

[0030] Figure 3 : A simulation result diagram of S parameters and frequency of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention;

[0031] Figure 4 : A diagram showing the axial ratio bandwidth simulation results of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention;

[0032] Figure 5 : A simulation result diagram of the axial ratio beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when operating at 1.54 GHz;

[0033] Figure 6 : A simulation result diagram of the axial ratio beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when operating at 1.86 GHz;

[0034] Figure 7 : The radiation pattern simulation result of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when operating at 1.54 GHz;

[0035] Figure 8 : The radiation pattern simulation result of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when operating at 1.86 GHz;

[0036] Fig. 9 : A simulation result diagram of half-power beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when operating at 1.54 GHz;

[0037] Fig.10: A simulation result diagram of half-power beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when operating at 1.86 GHz;

[0038] Among them, 1: first rectangular metal patch; 2: second rectangular metal patch; 3: metal base plate; 4a: coaxial feeding probe; a: first dielectric substrate; b: second dielectric substrate; 5a: first cut corner; 5b: second cut corner; 5c: third cut corner; 5d: fourth cut corner; 6a: first rectangular branch; 6b: fifth cut corner; 6c: sixth cut corner; 6d: second rectangular branch; 7a: first annular crack; 7b: second annular crack. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1

[0041] Please refer to Figure 1 , is a schematic structural diagram of a dual-frequency circularly polarized wide-axis ratio beam antenna provided by an embodiment of the present invention, comprising: a first dielectric substrate a, a second dielectric substrate b, a first rectangular metal patch 1, a second rectangular metal patch 2 and a coaxial feeding probe 4a;

[0042] Wherein, the first dielectric substrate a is arranged below the second dielectric substrate b;

[0043] The first rectangular metal patch 1 is disposed between the first dielectric substrate a and the second dielectric substrate b, and is located at the center of the upper surface of the first dielectric substrate a;

[0044] The second rectangular metal patch 2 is arranged at the center of the upper surface of the second dielectric substrate b;

[0045] The coaxial feeding probe 4a is arranged at the center of the dual-frequency circularly polarized wide axial ratio beam antenna;

[0046] The inner conductor of the coaxial feeding probe 4a passes through the first dielectric substrate a and is electrically connected to the first rectangular metal patch 1, and passes through the second dielectric substrate b and is electrically connected to the second rectangular metal patch 2, so that the coaxial feeding probe 4a feeds the first rectangular metal patch 1 and the second rectangular metal patch 2;

[0047] The four diagonal corners of the first rectangular metal patch 1 are respectively provided with a first cut angle 5a, a second cut angle 5b, a third cut angle 5c and a fourth cut angle 5d; the first cut angle 5a and the fourth cut angle 5d constitute a first cut angle group, and the second cut angle 5b and the third cut angle 5c constitute a second cut angle group, so that the first cut angle group and the second cut angle group are placed orthogonally, thereby realizing the left-handed circularly polarized wave of the antenna;

[0048] The first rectangular branch 6a, the second rectangular branch 6d, the fifth cut corner 6b and the sixth cut corner 6c are respectively arranged on the four diagonals of the second rectangular metal patch 2; the first rectangular branch 6a and the second rectangular branch 6d constitute a rectangular branch group, and the fifth cut corner 6b and the sixth cut corner 6c constitute a third cut corner group, so that the rectangular branch group and the third cut corner group are placed orthogonally, thereby realizing the right-handed circularly polarized wave of the antenna.

[0049] In this embodiment, the first cutting angle 5a and the fourth cutting angle 5d are equal in size and symmetrical in center; the second cutting angle 5b and the third cutting angle 5c are equal in size and symmetrical in center.

[0050] In this embodiment, the width of the first cut corner 5a and the fourth cut corner 5d is 8 mm; the width of the second cut corner 5b and the third cut corner 5c is 3 mm.

[0051] In this embodiment, the first cutting angle group and the second cutting angle group are placed orthogonally, thereby realizing the left-hand circularly polarized wave of the antenna, specifically including:

[0052] The first cutting angle group is placed orthogonally to the second cutting angle group, and the widths of the first cutting angle group and the second cutting angle group are combined to generate a pair of orthogonal modes on the first rectangular metal patch, so that the orthogonal electric field amplitudes of the dual-frequency circularly polarized wide axial ratio beam antenna are equal and differ by 90 degrees, thereby realizing the left-handed circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna.

[0053] In this embodiment, two pairs of cut angles of equal size and central symmetry are set, and the two pairs of cut angles are placed orthogonally. By controlling the sizes of the two pairs of cut angles, the perturbation can separate a pair of orthogonal modes on the first rectangular metal patch, so that the far-field orthogonal electric field amplitudes of the antenna are equal and differ by 90 degrees within a wide-angle range, thereby realizing left-handed circularly polarized waves in the low-frequency band.

[0054] In this embodiment, the first rectangular branch 6a and the second rectangular branch 6d are equal in size and symmetrical in center; the fifth cut corner 6b and the sixth cut corner 6c are equal in size and symmetrical in center.

[0055] In this embodiment, the width of the first rectangular branch 6a and the second rectangular branch 6d is 5 mm; the width of the fifth cut corner 6b and the sixth cut corner 6c is 4.9 mm.

[0056] In this embodiment, the first cutting angle group and the second cutting angle group are placed orthogonally, thereby realizing the right-hand circularly polarized wave of the antenna, specifically including:

[0057] The rectangular branch group is placed orthogonally to the third cut corner group, and the width of the rectangular branch group and the third cut corner group are combined to generate a pair of orthogonal modes on the second rectangular metal patch, so that the orthogonal electric field amplitudes of the dual-frequency circularly polarized wide axis ratio beam antenna are equal and differ by 90 degrees, thereby realizing the right-handed circularly polarized wave of the dual-frequency circularly polarized wide axis ratio beam antenna.

[0058] In this embodiment, a pair of rectangular branches and a pair of cut corners are arranged with equal size and central symmetry, and the pair of rectangular branches and the pair of cut corners are placed orthogonally. By controlling the size of the rectangular branches and the cut corners, the perturbation can separate a pair of orthogonal modes on the second rectangular metal patch, so that the far-field orthogonal electric field amplitudes of the antenna are equal and differ by 90 degrees within a wide-angle range, thereby realizing right-handed circularly polarized waves in the high-frequency band.

[0059] In this embodiment, the first rectangular metal patch 1 includes: a first annular crack 7a; the second rectangular metal patch 2 includes: a second annular crack 7b; the first annular crack 7a is arranged at the center position of the upper surface of the first rectangular metal patch 1; the second annular crack 7b is arranged at the center position of the upper surface of the second rectangular metal patch 2.

[0060] In this embodiment, the first annular crack 7a and the second annular crack 7b both take the coaxial feeding probe 4a as the center; the inner and outer radii and crack angles of the first annular crack 7a and the second annular crack 7b are different.

[0061] In this embodiment, the first annular crack 7a and the second annular crack 7b are centrally symmetrically distributed.

[0062] In this embodiment, the first annular crack and the second annular crack are provided, and the inner and outer radii and crack angles of the first annular crack and the second annular crack are used to achieve the dual-frequency characteristic of the dual-frequency circularly polarized wide axial ratio beam antenna.

[0063] In this embodiment, the outer conductor of the coaxial feeding probe 4 a is connected to the lower surface of the first dielectric substrate a; and a metal floor 3 is provided on the lower surface of the first dielectric substrate a.

[0064] In this embodiment, the material of the first dielectric substrate a and the second dielectric substrate b is FR4, with a relative dielectric constant of 4.4 and a loss tangent of 0.02.

[0065] In this embodiment, there is no air layer between the first dielectric substrate a and the second dielectric substrate b.

[0066] It should be noted that the size of the dual-frequency circularly polarized wide-axis ratio beam antenna described in the embodiment of the present invention is 80×80×5.6 mm (0.41×0.41×0.028 0), please refer to the following description, which is a description of the verification simulation results of the dual-frequency circularly polarized wide axial ratio beam antenna using HFSS simulation software.

[0067] In an alternative embodiment, please refer to Figure 3 , which is a simulation result diagram of S parameters and frequency of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention; wherein, the simulation is the corresponding S parameter value (input port return loss) of the dual-frequency circularly polarized wide axial ratio beam antenna in the frequency range of 1.3-2GHz, and the frequency bands where the S parameter is ≤-10dB are 1.47-1.57GHz and 1.81-1.87GHz, and the relative bandwidths are 6.5% and 3.2%.

[0068] In an alternative embodiment, please refer to Figure 4 , which is a diagram of the axial ratio bandwidth simulation results of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention; wherein, the AR (axial ratio) of the dual-frequency circularly polarized wide axial ratio beam antenna in the frequency range of 1.3-2GHz, in the frequency band of AR≤3dB is 1.53-1.55GHz and 1.85-1.87GHz, and the relative bandwidth is 1.3% and 1.1%.

[0069] It should be noted that, as follows Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 The unit of axial ratio is dB; Theta (usually represented by the symbol " ” indicates the angle of the antenna in the vertical plane, in degrees; phi indicates the angle of the antenna in the horizontal plane, in degrees (°); LHCP (Left Hand Circular Polarisation) is used to indicate the left-hand circular polarization of the antenna; RHCP (Right Hand Circular Polarisation) is used to indicate the right-hand circular polarization of the antenna.

[0070] In an alternative embodiment, please refer to Figure 5 , which is a simulation result diagram of the axial ratio beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided by an embodiment of the present invention when working at 1.54 GHz; Figure 6, which is a simulation result diagram of the axial ratio beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided by an embodiment of the present invention when working at 1.86GHz; wherein, the 3-dB axial ratio beam of the dual-frequency circularly polarized wide axial ratio beam antenna in four cross-sections is given, and at 1.54GHz, when phi=0°, 45°, 90° and 135°, the 3-dB axial ratio beam widths are 188°, 167°, 185° and 184° respectively; at 1.86GHz, when phi=0°, 45°, 90° and 135°, the 3-dB axial ratio beam widths are 164°, 141°, 188° and 184° respectively, and in the two main planes phi=0° and 90°, the 3-dB axial ratio beam widths of the dual-frequency circularly polarized wide axial ratio beam antenna at 1.54GHz and 1.86GHz are both greater than 160°.

[0071] In an alternative embodiment, please refer to Figure 7 , which is a radiation pattern simulation result of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when operating at 1.54 GHz; Figure 8 , which is a radiation pattern simulation result of a dual-frequency circularly polarized wide axial ratio beam antenna provided in an embodiment of the present invention when working at 1.86 GHz; wherein, Figure 7 As shown, the dual-frequency circularly polarized wide axial ratio beam antenna described in this embodiment has left-hand circular polarization performance at 1.54 GHz; Figure 8 As shown, the dual-frequency circularly polarized wide axial ratio beam antenna described in this embodiment has right-hand circular polarization performance at 1.86 GHz.

[0072] In an alternative embodiment, please refer to Fig. 9 , which is a simulation result diagram of half-power beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided by an embodiment of the present invention when operating at 1.54 GHz; Fig.10 , which is a simulation result diagram of the half-power beam width of a dual-frequency circularly polarized wide axial ratio beam antenna provided by an embodiment of the present invention when working at 1.86GHz; wherein, the half-power beam widths of the dual-frequency circularly polarized wide axial ratio beam antenna in four cross-sections are given; at 1.54GHz, when phi=0°, 45°, 90° and 135°, the half-power beam widths are 96°, 97°, 95° and 95° respectively, and at 1.86GHz, when phi=0°, 45°, 90° and 135°, the half-power beam widths are 91°, 93°, 92° and 92° respectively, and in the two main planes phi=0° and 90°, the half-power beam widths at 1.615GHz and 2.492GHz are both greater than 90°.

[0073] The dual-frequency circularly polarized wide axial ratio beam antenna described in this embodiment adopts a central feeding design to increase the overlap of the antenna phase center, thereby enhancing the stability of the antenna phase center, making the present invention more suitable for the GNSS navigation system to achieve high-precision positioning requirements, and is also conducive to the realization of wide axial ratio beam width and wide half-power beam width. The circular polarization performance is achieved by cutting corners and rectangular branches, which can more easily obtain better circular polarization performance, reduce back radiation, expand bandwidth, and reduce the difficulty of tuning the resonant frequency and circular polarization performance. Compared with the prior art, the 3-dB axial ratio beam width and half-power beam width at low and high frequencies can be improved. The simulation results show that the antenna has a 3-dB axial ratio beam greater than 160° and a half-power beam width greater than 92° in the two main radiation planes at the two frequency points of 1.54GHz and 1.86GHz, and has a strong anti-interference ability, which can become an excellent component of the GNSS navigation system (global navigation satellite system).

[0074] In summary, this embodiment realizes the dual-frequency radiation of the antenna by using a single coaxial feeding probe to feed the first rectangular metal patch and the second rectangular metal patch at the same time; corner cuts and rectangular branches are respectively set on the first rectangular metal patch and the second rectangular metal patch, so that the first rectangular metal patch and the second rectangular metal patch respectively generate orthogonal fields, thereby generating circular polarization with opposite rotation directions in the low-frequency and high-frequency bands, and realizing dual circular polarization characteristics. The design of center feeding increases the overlap of the antenna phase center, enhances the stability of the antenna phase center, and further improves the axial ratio beam width of the antenna, thereby improving the anti-interference ability of the dual-frequency circularly polarized wide axial ratio beam antenna, and ensuring the communication quality of the dual-frequency circularly polarized wide axial ratio beam antenna.

[0075] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A dual-frequency circularly polarized wide-axis ratio beam antenna, characterized in that: include: A first dielectric substrate, a second dielectric substrate, a first rectangular metal patch, a second rectangular metal patch and a coaxial feeding probe; Wherein, the first dielectric substrate is arranged below the second dielectric substrate; The first rectangular metal patch is disposed between the first dielectric substrate and the second dielectric substrate and is located at the center of the upper surface of the first dielectric substrate; The second rectangular metal patch is arranged at the center of the upper surface of the second dielectric substrate; The coaxial feeding probe is arranged at the center of the dual-frequency circularly polarized wide axial ratio beam antenna; The inner conductor of the coaxial feeding probe passes through the first dielectric substrate and is electrically connected to the first rectangular metal patch, and passes through the second dielectric substrate and is electrically connected to the second rectangular metal patch, so that the coaxial feeding probe feeds the first rectangular metal patch and the second rectangular metal patch; The four diagonal corners of the first rectangular metal patch are respectively provided with a first cut angle, a second cut angle, a third cut angle and a fourth cut angle; the first cut angle and the fourth cut angle constitute a first cut angle group, and the second cut angle and the third cut angle constitute a second cut angle group, so that the first cut angle group and the second cut angle group are placed orthogonally, thereby realizing the left-handed circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna; The first rectangular branch, the second rectangular branch, the fifth cut angle and the sixth cut angle are respectively arranged on the four diagonals of the second rectangular metal patch; the first rectangular branch and the second rectangular branch constitute a rectangular branch group, and the fifth cut angle and the sixth cut angle constitute a third cut angle group, so that the rectangular branch group and the third cut angle group are orthogonally placed, thereby realizing the right-handed circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna; The first rectangular metal patch includes: a first annular crack; the second rectangular metal patch includes: a second annular crack; the first annular crack is arranged at the center position of the upper surface of the first rectangular metal patch; the second annular crack is arranged at the center position of the upper surface of the second rectangular metal patch; the first annular crack and the second annular crack are both centered on the coaxial feeding probe; the inner and outer radii and crack angles of the first annular crack and the second annular crack are different.

2. A dual-frequency circularly polarized wide-axis ratio beam antenna as claimed in claim 1, characterized in that: The first cutting angle and the fourth cutting angle are equal in size and centrally symmetrical; The second cutting angle and the third cutting angle are equal in size and centrally symmetrical.

3. A dual-frequency circularly polarized wide-axis ratio beam antenna as claimed in claim 1 or 2, characterized in that: The width of the first cut corner and the fourth cut corner is 8 mm; The width of the second cut corner and the third cut corner is 3 mm.

4. A dual-frequency circularly polarized wide-axis ratio beam antenna as claimed in claim 3, characterized in that: The first cutting angle group and the second cutting angle group are placed orthogonally, thereby realizing the left-hand circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna, specifically including: The first cutting angle group is placed orthogonally to the second cutting angle group, and the widths of the first cutting angle group and the second cutting angle group are combined to generate a pair of orthogonal modes on the first rectangular metal patch, so that the orthogonal electric field amplitudes of the dual-frequency circularly polarized wide axial ratio beam antenna are equal and differ by 90 degrees, thereby realizing the left-handed circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna.

5. The dual-frequency circularly polarized wide-axis ratio beam antenna according to claim 1, characterized in that: The first rectangular branch and the second rectangular branch are equal in size and centrally symmetrical; The fifth cutting angle and the sixth cutting angle are equal in size and centrally symmetrical.

6. A dual-frequency circularly polarized wide-axis ratio beam antenna as claimed in claim 1 or 5, characterized in that: The width of the first rectangular branch and the second rectangular branch is 5 mm; The width of the fifth and sixth cut corners is 4.9 mm.

7. A dual-frequency circularly polarized wide-axis ratio beam antenna as claimed in claim 6, characterized in that: The rectangular branch group and the third cut corner group are orthogonally placed, thereby realizing the right-hand circularly polarized wave of the dual-frequency circularly polarized wide axial ratio beam antenna, specifically comprising: The rectangular branch group is placed orthogonally to the third cut corner group, and the width of the rectangular branch group and the third cut corner group are combined to generate a pair of orthogonal modes on the second rectangular metal patch, so that the orthogonal electric field amplitudes of the dual-frequency circularly polarized wide axis ratio beam antenna are equal and differ by 90 degrees, thereby realizing the right-handed circularly polarized wave of the dual-frequency circularly polarized wide axis ratio beam antenna.

8. The dual-frequency circularly polarized wide-axis ratio beam antenna according to claim 1, characterized in that: The outer conductor of the coaxial feeding probe is connected to the lower surface of the first dielectric substrate; A metal floor is disposed on the lower surface of the first dielectric substrate.

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