Dual-polarization phased-array antenna capable of simultaneously improving co-polarization coupling and different-polarization coupling

Abstract

The invention discloses a dual-polarization phased-array antenna capable of simultaneously improving co-polarization coupling and different-polarization coupling, which comprises a plurality of antenna units distributed in two polarization directions, adjacent antenna units form an L-shaped position relationship, and four adjacent antenna units form a cross-shaped structure; each antenna unit comprises a dipole antenna, a decoupling surface and a metal cavity, the decoupling surface is suspended above the dipole antenna, and the dipole antenna is located in the metal cavity; the dipole antenna comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, a first dipole arm, a first director oscillator, a third dipole arm, a metal conduction band, a second dipole arm, a second director oscillator, a first metal surface, a second metal surface and a grounding coplanar waveguide-substrate integrated coaxial line, wherein the first dielectric substrate, the second dielectric substrate and the third dielectric substrate are stacked in sequence. Coupling between dipoles of same polarization and different polarization is effectively improved, 31.9% impedance bandwidth is achieved, the isolation degree in the working bandwidth is better than 20 dB, and the beam scanning angle range reaches + / -40 degrees.

Description

Technical Field

[0001] The invention belongs to the technical field of antennas, and in particular relates to a dual-polarization phased array antenna capable of simultaneously improving co-polarization and hetero-polarization coupling. Background Art

[0002] With the rapid development of modern communications, users' demand for wireless communications is increasing, which puts higher requirements on wireless communication services. The fifth generation (5G) wireless communication technology with the characteristics of high speed, low latency and large capacity has emerged. Compared with the traditional low frequency band below 6GHz, the millimeter wave band with rich spectrum resources can provide higher data throughput and lower latency. However, the higher frequency of millimeter waves causes increased path loss, and has the disadvantages of easy attenuation and short transmission distance. The phased array technology can adjust the phase and amplitude of each unit of the array antenna to control the beam, maximize the energy of the main lobe radiation, and reduce the energy of the side lobe radiation. By utilizing the characteristics of phased array technology, directional transmission can be achieved, the transmission distance can be increased, and the high path loss characteristics of millimeter waves can be overcome. Therefore, designing broadband phased array antennas in millimeter wave bands is of great significance to millimeter wave 5G communications.

[0003] Dual-polarized antennas can transmit and receive two orthogonally polarized signals at the same time, which is equivalent to transmitting twice the amount of data in the same spectrum. This technology is particularly important in MIMO (Multiple Input Multiple Output) systems, which can significantly improve data transmission rates and system capacity, and has important application value in millimeter-wave phased array antennas. However, dual-polarized antenna arrays still have a variety of polarization mutual coupling problems, including co-polarization mutual coupling and heteropolarization mutual coupling of different units. In terms of circuit performance, mutual coupling leads to deteriorated matching and reduced isolation. In terms of radiation performance, mutual coupling leads to decreased antenna gain, lower efficiency, and distorted radiation patterns. In addition, the coupling between different polarizations will also affect the performance of polarization diversity in MIMO systems. Therefore, for dual-polarized phased array antennas, it is of great significance to study a structure that can achieve broadband decoupling of dual-polarized phased array antennas. Summary of the invention

[0004] The purpose of the present invention is to address the problem of various types of coupling in dual-polarized phased array antennas, and to propose a dual-polarized phased array antenna that simultaneously improves co-polarized and hetero-polarized coupling. The present invention suspends the decoupling surface structure at a position about 0.2 times the wavelength directly above the dipole antenna, introduces an anti-phase coupling path between the dipole antennas, and places a metal cavity between the dipole antennas to block the spatial wave coupling of the dipole antennas. These two structures achieve broadband decoupling of the antenna, while the antenna maintains good impedance matching, has broadband characteristics, and the maximum beam scanning angle range reaches ±40°.

[0005] The present invention is realized by the following technical scheme: a dual-polarized phased array antenna that simultaneously improves co-polarization and hetero-polarization coupling, operates in the millimeter wave frequency band, and comprises 2 n There are periodically distributed antenna units, n≥2, adjacent antenna units are in an L-shaped position relationship, and four adjacent antenna units form a cross-shaped structure.

[0006] Each antenna unit comprises a dipole antenna, a decoupling surface and a metal cavity, wherein the decoupling surface is suspended above the dipole antenna and the dipole antenna is located in the metal cavity; the metal cavities of adjacent antenna units share the same cavity side wall.

[0007] The dipole antenna includes a first dielectric substrate, a second dielectric substrate, and a third dielectric substrate stacked in sequence, as well as a first dipole arm, a first director oscillator, a third dipole arm, a metal conducting strip, a second dipole arm, a second director oscillator, a first metal surface, a second metal surface, and a grounded coplanar waveguide-to-substrate integrated coaxial line.

[0008] The first dielectric substrate is located below the decoupling surface and is vertically arranged with respect to the decoupling surface.

[0009] The front side of the first dielectric substrate is provided with a first metal surface, a first dipole arm, a first director oscillator and a grounded coplanar waveguide to substrate integrated coaxial line; the first metal surface serves as a reflector of the first dipole; one end of the first dipole arm is connected to the first metal surface close to the decoupling surface; the other end of the first dipole arm is suspended, and two first director oscillators are provided on the suspended end side; the end of the first metal surface away from the decoupling surface is provided with a grounded coplanar waveguide to substrate integrated coaxial line.

[0010] The second dielectric substrate is located on the back of the first dielectric substrate and is used to bond the first dielectric substrate and the third dielectric substrate.

[0011] The third dielectric substrate is located on the back side of the second dielectric substrate.

[0012] A second metal surface, a second dipole arm, and a second director vibrator are provided on the back side of the third dielectric substrate; the second metal surface is used as a reflector for the second dipole; one end of the second dipole arm is connected to the second metal surface close to the decoupling surface; the other end of the second dipole arm is suspended, and two second director vibrators are provided on the suspended end side.

[0013] The metal conductive strip is located between the third dielectric substrate and the second dielectric substrate; one end of the metal conductive strip close to the decoupling surface is connected to one end of the third dipole arm, and the other end of the third dipole arm is suspended.

[0014] The decoupling surface includes a fourth dielectric substrate and a third metal surface located on the upper surface of the fourth dielectric substrate.

[0015] The third metal surface includes metal patches distributed in a 2×3 matrix, and there is a gap between adjacent metal patches.

[0016] The feeding element is composed of a grounded coplanar waveguide-to-substrate integrated coaxial line and a metal guide strip; a plurality of first metallized through holes are periodically distributed on both sides of the metal guide strip; the first metallized through holes penetrate the first dielectric substrate, the second dielectric substrate, and the third dielectric substrate, and are used to connect the first metal surface and the second metal surface; the bottom end of the metal guide strip is connected to the grounded coplanar waveguide-to-substrate integrated coaxial line through a second metallized blind hole; and the second metallized blind hole penetrates the first dielectric substrate.

[0017] Preferably, the distance between the decoupling surface and the dipole antenna is 0.2λ0, where λ0 is the wavelength corresponding to the central operating frequency of the antenna unit.

[0018] Preferably, the two first guiding vibrators have the same length and width and are arranged in parallel with a distance between them; the first guiding vibrator close to the first dipole arm has a distance from the first dipole arm; the two second guiding vibrators have the same length and width and are arranged in parallel with a distance between them; the second guiding vibrator close to the second dipole arm has a distance from the second dipole arm.

[0019] Preferably, the first dipole arm and the second dipole arm have the same orientation, which is opposite to the third dipole arm.

[0020] Preferably, the top end of the metal cavity is lower than the suspended end of the first dipole arm.

[0021] Preferably, the distance from the suspended end of the first dipole arm to the end of the first metal surface close to the decoupling surface is less than or equal to λ0 / 4; λ0 is the wavelength corresponding to the central operating frequency of the antenna unit; the distance from the suspended end of the second dipole arm to the end of the second metal surface close to the decoupling surface is less than or equal to λ0 / 4; λ0 is the wavelength corresponding to the central operating frequency of the antenna unit.

[0022] Preferably, the length and width of the first director vibrator and the second director vibrator are equal.

[0023] The present invention has the following characteristics: (1) The antenna adopts the structure of metal cavity and decoupling surface, which greatly improves the coupling between the co-polarized and hetero-polarized dipole antenna units. The decoupling structure is small in size and easy to design and process.

[0024] (2) The antenna achieves a high isolation of more than 20dB within the operating frequency band while maintaining good impedance matching.

[0025] (3) Compared with ordinary millimeter-wave dual-polarization phased array antennas, this antenna array has a larger bandwidth (23.7~32.7Ghz) and higher gain, and has good beam scanning performance with a maximum scanning angle of 40°. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the dual-polarization phased array antenna of the present invention.

[0027] Figure 2 It is a schematic diagram of the three-dimensional structure of the antenna unit of the present invention.

[0028] Figure 3 (a) is a bottom view of the antenna unit.

[0029] Figure 3 (b) is a side view of the dual-polarization phased array antenna.

[0030] Figure 3 (c) is a side view of the dual-polarization phased array antenna without the metal cavity.

[0031] Figure 4 It is a top view of the dual-polarization phased array antenna of the present invention.

[0032] Figure 5 It is a simulation diagram of the unit reflection coefficient of the present invention.

[0033] Figure 6 It is a simulation diagram of isolation between units of the present invention.

[0034] Figure 7 It is a comparison chart of the isolation simulation results of the present invention and the reference antenna without a metal cavity structure.

[0035] Figure 8 It is a comparison diagram of the isolation simulation results of the present invention and the reference antenna without a decoupling surface structure.

[0036] Fig. 9 It is the active S parameter of the central antenna unit during E-plane beam scanning of the present invention.

[0037] Fig.10 It is the active S parameter of the central antenna unit during H-plane beam scanning of the present invention.

[0038] Fig.11 This is the E-plane directional beam scanning diagram of the present invention at 27 GHz.

[0039] Fig.12 This is the H-plane directional beam scanning diagram of the present invention at 27 GHz.

[0040] Markings in the figure: 1. dipole antenna; 1-1. first dielectric substrate; 1-2. second dielectric substrate; 1-3. third dielectric substrate; 1-4. first dipole arm; 1-5. first director oscillator; 1-6. third dipole arm; 1-7. metal guide strip; 1-8. second dipole arm; 1-9. second director oscillator; 1-10. first metal surface; 1-11. second metal surface; 1-12. grounded coplanar waveguide-to-substrate integrated coaxial line; 1-13. first metalized through hole; 1-14. second metalized blind hole; 2. decoupling surface; 2-1. fourth dielectric substrate; 2-2. third metal surface; 3. metal cavity. DETAILED DESCRIPTION

[0041] The present invention is further analyzed below in conjunction with specific embodiments.

[0042] like Figure 1 , Figure 4 As shown, a dual-polarization phased array antenna that simultaneously improves co-polarization and hetero-polarization coupling operates in the millimeter wave frequency band, including 2 n There are periodically distributed antenna units, n≥2, adjacent antenna units are in an L-shaped positional relationship, and a cross-shaped structure is formed by four adjacent antenna units; this embodiment uses 32 cross-arranged antenna units, with 16 antenna units in the horizontal and vertical directions, the horizontal direction is recorded as the X-axis, the vertical direction is recorded as the Y-axis, and the direction perpendicular to the XOY plane is recorded as the Z-axis.

[0043] like Figure 2 , Figure 3 Middle (a), Figure 3 Middle (b), Figure 3 As shown in (c), each antenna unit includes a dipole antenna 1, a decoupling surface 2, and a metal cavity 3, wherein the decoupling surface 2 is suspended above the dipole antenna 1, and the dipole antenna 1 is located in the metal cavity 3; the metal cavities 3 of adjacent antenna units share the same cavity side wall.

[0044] The distance between the decoupling surface 2 and the dipole antenna 1 is 0.2λ0, where λ0 is the wavelength corresponding to the central operating frequency of the antenna unit.

[0045] The dipole antenna 1 includes a first dielectric substrate 1-1, a second dielectric substrate 1-2, and a third dielectric substrate 1-3 stacked in sequence, as well as a first dipole arm 1-4, a first director 1-5, a third dipole arm 1-6, a metal guide strip 1-7, a second dipole arm 1-8, a second director 1-9, a first metal surface 1-10, a second metal surface 1-11, and a grounded coplanar waveguide-to-substrate integrated coaxial line 1-12.

[0046] The first dielectric substrate 1 - 1 is located below the decoupling surface 2 and is vertically arranged with respect to the decoupling surface 2 ; the first dielectric substrate 1 - 1 is made of Rogers 5880, with a dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 0.254 mm.

[0047] The front side of the first dielectric substrate 1-1 is provided with a first metal surface 1-10, a first dipole arm 1-4, a first director oscillator 1-5 and a grounded coplanar waveguide to substrate integrated coaxial line 1-12; the first metal surface 1-10 serves as a reflector of the first dipole; one end of the first metal surface 1-10 close to the decoupling surface 2 is connected to the first dipole arm 1-4; the other end of the first dipole arm 1-4 is suspended, and a first director oscillator 1-5 is provided on the suspended end side; a notch is provided at the end of the first metal surface 1-10 away from the decoupling surface 2, the notch is composed of an integrally formed first notch and a second notch, the width of the first notch is smaller than the second notch, a grounded coplanar waveguide to substrate integrated coaxial line 1-12 is provided in the first notch; there is a gap between the grounded coplanar waveguide to substrate integrated coaxial line 1-12 and the first metal surface 1-10.

[0048] The first guiding vibrator 1-5 includes two metal patches of the same length and width and arranged in parallel, and there is a distance between the two; the first guiding vibrator 1-5 close to the first dipole arm 1-4 is at a distance from the first dipole arm 1-4; the second guiding vibrator 1-9 includes two metal patches of the same length and width and arranged in parallel, and there is a distance between the two; the second guiding vibrator 1-9 close to the second dipole arm 1-8 is at a distance from the second dipole arm 1-8; the dipole arm length Ld formed by the first dipole arm 1-4, the second dipole arm 1-8, and the third dipole arm 1-6 is 4.35 mm, and the dipole arm length Ld is 4.35 mm. The width of the dipole arm Wd is 0.7mm, and the distance Lst from the dipole arm to the reflector is 1.8mm; the distance Ddip between the dipoles on the dipole antenna 1 of adjacent antenna units in the same polarization direction is 6.3mm; the lengths Lyin1 and Lyin2 of the two metal patches of the first director 1-5 are both 2.9mm, the distance Hyin1 between the first metal patch of the first director 1-5 (i.e., the metal patch close to the first dipole arm 1-4) and the first dipole arm 1-4 is 0.2mm, and the distance Hyin2 between the two metal patches of the first director 1-5 is 1.1mm.

[0049] The second dielectric substrate 1-2 is located on the back of the first dielectric substrate 1-1 and is used to bond the first dielectric substrate 1-1 and the third dielectric substrate 1-3; the second dielectric substrate 1-2 is Roger450F, with a dielectric constant of 3.52, a loss tangent of 0.004, and a thickness of 0.1 mm.

[0050] The third dielectric substrate 1 - 3 is located on the back of the second dielectric substrate 1 - 2 ; the third dielectric substrate 1 - 3 is made of Rogers 5880, with a dielectric constant of 2.2, a loss tangent of 0.0009, and a thickness of 0.254 mm.

[0051] The back side of the third dielectric substrate 1-3 is provided with a second metal surface 1-11, a second dipole arm 1-8, and a second director oscillator 1-9; the second metal surface 1-11 is used as a reflector for the second dipole; one end of the second metal surface 1-11 close to the decoupling surface 2 is connected to the second dipole arm 1-8; the other end of the second dipole arm 1-8 is suspended, and a second director oscillator 1-9 is provided on the suspended end side.

[0052] The metal conductive strip 1-7 is located between the first dielectric substrate 1-1 and the second dielectric substrate (1-2); one end of the metal conductive strip 1-7 close to the decoupling surface 2 is connected to one end of the third dipole arm 1-6, and the other end of the third dipole arm 1-6 is suspended.

[0053] The first dipole arm 1 - 4 and the second dipole arm 1 - 8 have the same orientation, which is opposite to the orientation of the third dipole arm 1 - 6 .

[0054] The decoupling surface 2 includes a fourth dielectric substrate 2 - 1 and a third metal surface 2 - 2 located on the upper surface of the fourth dielectric substrate 2 - 1 .

[0055] The third metal surface 2-2 includes rectangular metal patches distributed in a 2×3 matrix, and there is a gap between adjacent metal patches; the length L of the metal patch is 1mm, the width is 1mm, and the gap between adjacent metal patches is 0.1mm; the third metal surface 2-2 is directly above the dipole antenna 1, and the array distribution of the rectangular metal patches is the same as the two polarization directions of the dipole antenna 1.

[0056] The feeding element is composed of a grounded coplanar waveguide-to-substrate integrated coaxial line 1-12 and a metal conductive strip 1-7; a plurality of first metallized through holes 1-13 distributed periodically are arranged on both sides of the metal conductive strip 1-7, that is, a plurality of first metallized through holes 1-13 are arranged on both sides of the first notch and the second notch; the first metallized through holes 1-13 penetrate the first dielectric substrate 1-1, the second dielectric substrate 1-2, and the third dielectric substrate 1-3, and are used to connect the first metal surface 1-10 and the second metal surface 1-11; the bottom end of the metal conductive strip 1-7 is connected to the grounded coplanar waveguide-to-substrate integrated coaxial line 1-12 through a second metallized blind hole 1-14; the second metallized blind hole 1-14 penetrates the first dielectric substrate 1-1; the spacing Wout of the two rows of first metallized through holes 1-13 located on both sides of the metal conductive strip 1-7 is 2 mm.

[0057] The upper parts of the first dielectric substrate 1-1, the second dielectric substrate 1-2, and the third dielectric substrate 1-3 of the dipole antenna 1 are partially cut off to place the metal cavity 3; the lower parts of the dielectric substrates of adjacent dipole antennas 1 are in contact. The number of the metal cavities 3 is the same as that of the dipole antennas 1. The width Wsub of the upper parts of the first dielectric substrate 1-1, the second dielectric substrate 1-2, and the third dielectric substrate 1-3 is 6.3 mm; the height Hcav of the metal cavity 3 is 5.2 mm, and the diagonal length Lcav of the metal cavity 3 is 6.4 mm.

[0058] The dipole antennas 1 of the same polarization are arranged at equal distances.

[0059] The width of the upper part of the first dielectric substrate 1-1, the second dielectric substrate 1-2, and the third dielectric substrate 1-3 is Wsub<Lcav; Lcav is the length of the diagonal line of the metal cavity 3. There is a gap between the metal cavity 3 and the upper part of the dielectric substrate.

[0060] The top end of the metal cavity 3 is lower than the suspended end of the first dipole arm 1 - 4 .

[0061] The distance from the suspended end of the first dipole arm 1-4 to the end of the first metal surface 1-10 close to the decoupling surface 2 is less than or equal to λ0 / 4; λ0 is the wavelength corresponding to the central operating frequency of the antenna unit; the distance from the suspended end of the second dipole arm 1-8 to the end of the second metal surface 1-11 close to the decoupling surface 2 is less than or equal to λ0 / 4; λ0 is the wavelength corresponding to the central operating frequency of the antenna unit.

[0062] The length and width of the first director vibrator 1-5 and the second director vibrator 1-9 are equal.

[0063] Adjacent antenna units are in an L-shaped position relationship to achieve dual-polarization characteristics. When one of the antenna units is working, the signal is transmitted from the grounded coplanar waveguide to the substrate integrated coaxial line 1-12 to the dipole antenna 1. Each antenna unit is located in a metal cavity 3, which can block the spatial coupling waves between antenna units of different polarizations and can well improve the heteropolarization coupling. A decoupling surface 2 is provided above the antenna, and above each antenna unit there is a third metal surface 2-2 composed of multiple rectangular metal patches distributed in a 2×3 matrix. The decoupling surface 2 with the third metal surface 2-2 can generate an anti-phase coupling wave, and the spatial coupling waves of the antenna units with the same polarization are offset, which can well improve the co-polarization coupling.

[0064] Figure 5 This is a diagram of the S parameter simulation results of the dual-polarized phased array antenna of the present invention. The -10dB bandwidth (23.7~32.7Ghz) reaches 31.9%, indicating that the antenna achieves good impedance matching and has broadband characteristics.

[0065] Figure 6This is a simulation result diagram of the isolation between adjacent units of the dual-polarized phased array antenna of the present invention, including the isolation of E-plane co-polarization, H-plane co-polarization, and heteropolarization, which are all lower than -20dB in the operating frequency band of 23.7~32.7Ghz.

[0066] Figure 7-8 This is a comparison chart of the isolation simulation results between the present invention and the reference antenna without a metal cavity and a decoupling surface. It can be seen that after the antenna is loaded with a metal cavity and a decoupling surface, the isolation between the co-polarization and hetero-polarization of the E-plane is significantly improved, achieving broadband decoupling and increasing the isolation by a maximum of 23dB.

[0067] Figures 9-10 The active S parameters of the central antenna unit of the dual-polarized phased array antenna to which the present invention is applied include the cases of different scanning angles of the E plane and the H plane. It can be seen that the phased array antenna maintains good active impedance matching during beam scanning.

[0068] Figures 11-12 This is a beam scanning simulation diagram of the dual-polarized phased array antenna of the present invention at 27 GHz, including E-plane scanning and H-plane scanning. It can be seen that within the 3 dB gain variation scanning range, the maximum beam pointing of the phased array antenna reaches ±40°, verifying that the antenna has good beam scanning capability.

[0069] The above is only a preferred embodiment of the present invention, and does not limit the embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should be included in the scope of protection of the claims of the present invention.

Claims

1. A dual-polarized phased array antenna that simultaneously improves co-polarization and hetero-polarization coupling, characterized in that Includes 2 n There are periodically distributed antenna units, n≥2, adjacent antenna units are in an L-shaped position relationship, and four adjacent antenna units form a cross-shaped structure; Each antenna unit comprises a dipole antenna (1), a decoupling surface (2), and a metal cavity (3), wherein the decoupling surface (2) is suspended above the dipole antenna (1), and the dipole antenna (1) is located in the metal cavity (3); The dipole antenna (1) comprises a first dielectric substrate (1-1), a second dielectric substrate (1-2), and a third dielectric substrate (1-3) stacked in sequence, as well as a first dipole arm (1-4), a first director oscillator (1-5), a third dipole arm (1-6), a metal conducting strip (1-7), a second dipole arm (1-8), a second director oscillator (1-9), a first metal surface (1-10), a second metal surface (1-11), and a grounded coplanar waveguide-to-substrate integrated coaxial line (1-12).

2. The antenna according to claim 1, characterized in that: The distance between the decoupling surface (2) and the dipole antenna (1) is 0.2λ0, where λ0 is the wavelength corresponding to the central operating frequency of the antenna unit.

3. The antenna according to claim 1, characterized in that: In the dipole antenna (1), the first dielectric substrate (1-1) is located below the decoupling surface (2) and is arranged perpendicular to the decoupling surface (2); The front surface of the first dielectric substrate (1-1) is provided with a first metal surface (1-10), a first dipole arm (1-4), a first director oscillator (1-5) and a grounded coplanar waveguide-to-substrate integrated coaxial line (1-12); one end of the first metal surface (1-10) close to the decoupling surface (2) is terminated with the first dipole arm (1-4); the other end of the first dipole arm (1-4) is suspended, and a first director oscillator (1-5) is provided on the suspended end side; and the end of the first metal surface (1-10) far from the decoupling surface (2) is provided with a grounded coplanar waveguide-to-substrate integrated coaxial line (1-12); The second dielectric substrate (1-2) is located on the back side of the first dielectric substrate (1-1); The third dielectric substrate (1-3) is located on the back side of the second dielectric substrate (1-2); The back side of the third dielectric substrate (1-3) is provided with a second metal surface (1-11), a second dipole arm (1-8), and a second director oscillator (1-9); one end of the second metal surface (1-11) close to the decoupling surface (2) is connected to the second dipole arm (1-8); the other end of the second dipole arm (1-8) is suspended, and a second director oscillator (1-9) is provided on the suspended end side; The metal conductive strip (1-7) is located between the first dielectric substrate (1-1) and the second dielectric substrate (1-2); one end of the metal conductive strip (1-7) close to the decoupling surface (2) is connected to the third dipole arm (1-6), and the other end of the third dipole arm (1-6) is suspended.

4. The antenna according to claim 3, characterized in that: The first director vibrator (1-5) comprises two metal patches of the same length and width and arranged in parallel, and there is a distance between the two; the first director vibrator (1-5) close to the first dipole arm (1-4) is at a distance from the first dipole arm (1-4); the second director vibrator (1-9) comprises two metal patches of the same length and width and arranged in parallel, and there is a distance between the two; the second director vibrator (1-9) close to the second dipole arm (1-8) is at a distance from the second dipole arm (1-8).

5. The antenna according to claim 1, characterized in that: The first dipole arm (1-4) and the second dipole arm (1-8) have the same orientation, which is opposite to the orientation of the third dipole arm (1-6).

6. The antenna according to claim 1, characterized in that: The decoupling surface (2) comprises a fourth dielectric substrate (2-1) and a third metal surface (2-2) located on the upper surface of the fourth dielectric substrate (2-1); The third metal surface (2-2) includes metal patches distributed in a 2×3 matrix, and there is a gap between adjacent metal patches.

7. The antenna according to claim 1, characterized in that: A plurality of periodically distributed first metallized through holes (1-13) are provided on both sides of the metal conductive strip (1-7); the first metallized through holes (1-13) penetrate the first dielectric substrate (1-1), the second dielectric substrate (1-2), and the third dielectric substrate (1-3), and are used to connect the first metal surface (1-10) and the second metal surface (1-11).

8. The antenna according to claim 1, characterized in that: The metal conductive strip (1-7) is connected to the grounded coplanar waveguide-to-substrate integrated coaxial line (1-12) via a second metallized blind hole (1-14); the second metallized blind hole (1-14) runs through the first dielectric substrate (1-1).

9. The antenna according to claim 1, characterized in that: The top end of the metal cavity (3) is lower than the suspended end of the first dipole arm (1-4).

10. The antenna according to claim 1, characterized in that: The length and width of the first director vibrator (1-5) and the second director vibrator (1-9) are equal.

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