A millimeter wave dual-frequency dual-polarization antenna array with separate feeding

Abstract

A millimeter-wave dual-frequency dual-polarized antenna array is, belonging to the field of 5G wireless communication and antenna technology. It is composed of a plurality of antenna units with the same structure, each antenna including two dielectric layers, three metal layers, two feeding probes for low-frequency patch feeding, two feeding probes for high-frequency patch feeding, and two coupling feeding branches. Among them, the two dielectric layers include an upper dielectric substrate A and a lower dielectric substrate B, and the three metal layers include a low-frequency annular metal patch, a high-frequency metal patch, and a metal floor. The present invention adopts two laminated structures of low-frequency annular metal patches and high-frequency metal patches to realize dual-frequency operation, and feeds different polarizations and different frequencies separately, reducing the burden on millimeter-wave circuits, especially filters; antennas of different frequency bands share radiation units, and the antenna structure is compact, small in size, and low in profile, which is suitable for the frame of mobile phones taking Qualcomm chips as an example; the antenna array directional pattern is stable, achieving a win-win situation of dual polarization, wide scanning angle and small size.

Description

Technical Field

[0001] The present invention belongs to the field of 5G wireless communication and antenna technology, and relates to a dual-polarization millimeter wave communication laminated patch antenna array with dual-band separate feeding. Background Art

[0002] With the transition from the fourth generation (4G) mobile communication network to the fifth generation (5G) mobile communication network, millimeter wave technology as a key technology of 5G has attracted the attention of more and more countries. At present, the global authorized 5G millimeter wave frequency bands include n258 (24.25~27.50GHz), n257 (26.50~29.50GHz), n261 (27.50~28.35GHz) and n260 (37.0~40.0GHz). China has also authorized its own millimeter wave communication frequency bands: 24.25~27.5GHz and 37~43.5GHz. In terms of frequency band coverage, dual-band antennas have greater advantages. At the same time, as the functions supported by smartphones become more and more complex, the number of antennas is also increasing, and the space provided for millimeter waves is very limited. How to design a compact and high-performance millimeter wave antenna array has become a research hotspot. The propagation link loss of millimeter wave communication is large, and the antenna should have the characteristics of high gain. At the same time, the terminal antenna also needs a wide coverage range, high gain and wide scanning angle, which brings challenges to antenna design. Furthermore, due to the limitation of line-of-sight transmission (LOS), millimeter wave communication is prone to polarization mismatch, so dual-polarization characteristics are also particularly important for millimeter wave antennas.

[0003] When a traditional dual-frequency antenna is working, the feeding port stimulates the dual-frequency band operation at the same time. However, due to the requirements of the back-end circuit, the two frequency bands need to be processed separately, which requires adding filters to the circuit to filter out high-frequency resonance and low-frequency resonance respectively, thereby increasing the complexity and cost of the system. Therefore, it is an important requirement to simplify the millimeter-wave circuit to feed the high-frequency resonance and low-frequency resonance ports of the millimeter-wave antenna separately, share the radiator while ensuring the isolation between different frequencies. However, there are still few millimeter-wave antenna design solutions that feed high and low frequencies separately.

[0004] The present invention designs a laminated radiation patch. The two working resonance points of the low-frequency antenna and the high-frequency antenna can be achieved by adjusting the size of the upper annular metal patch and the lower butterfly-shaped metal patch respectively. The four feed ports can respectively realize low-frequency vertical polarization, low-frequency horizontal polarization, high-frequency vertical polarization and high-frequency horizontal polarization. By adding blind hole structure and through-hole structure, and using capacitive coupling feeding technology, the isolation between high and low frequencies can be effectively improved, and the requirements for filters in subsequent RF circuits can be reduced. The antenna unit is applied to a 1×4 linear array to achieve good beam scanning performance. Summary of the invention

[0005] In order to reduce the burden of the millimeter wave terminal radio frequency module and realize a miniaturized, large bandwidth, high-gain millimeter wave antenna, the present invention designs a millimeter wave antenna array with high and low frequency feeding respectively for mobile device terminals. The antenna radiator is a capacitively coupled fed laminated patch antenna. By adding blind holes, vias and T-shaped feeding branch structures, dual-band and dual-polarization are realized to ensure the isolation between orthogonal polarization antennas. The 1×4 linear array composed of this antenna unit is used to achieve a wide array scanning angle.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A millimeter-wave dual-frequency dual-polarized antenna array with separate feeding is composed of a plurality of antenna units with the same structure arranged and combined, wherein each antenna comprises two dielectric layers, three metal layers, two feeding probes for low-frequency patch feeding, two feeding probes for high-frequency patch feeding, and two coupling feeding branches. The two dielectric layers comprise an upper dielectric substrate A16 and a lower dielectric substrate B17, and the three metal layers comprise a low-frequency annular metal patch 1, a high-frequency metal patch 2, and a metal floor 3.

[0008] The low-frequency annular metal patch 1 is located on the upper surface of the dielectric substrate A16, and the annular patch can be a circular ring, a square ring or a ring of other shapes. The high-frequency metal patch 2 is located on the upper surface of the lower dielectric substrate B17, and the lower dielectric substrate B17 is placed on the metal floor 3. The electrical length of the high-frequency metal patch 2 is smaller than that of the low-frequency annular metal patch 1, and the shape can be square, rectangular, circular, butterfly-shaped, etc., without clear restrictions, subject to meeting the antenna bandwidth, frequency and other performance. The low-frequency annular metal patch 1 is used to generate low-frequency resonance, and the low-frequency operating frequency can be adjusted by adjusting the size of the patch 1; the high-frequency metal patch 2 is used to generate high-frequency resonance, and the high-frequency operating frequency can be adjusted by adjusting its patch size and chamfering.

[0009] The metal floor 3 is provided with six through holes, four of which are used to pass through four feeding probes respectively. The feeding probes 14 and 15 for feeding the high-frequency patch 2 will continue to pass through the dielectric substrate B17, and the feeding probe for feeding the low-frequency patch 1 will continue to pass through the dielectric substrates B17 and A16. The other two through holes are metallized through holes 10 and 11. The lower high-frequency patch 2 and the metal floor 3 are connected by the metallized through holes 10 and 11, which can improve the isolation between different polarization ports in the low-frequency band.

[0010] The two coupling feeding branches include a T-shaped branch A4 and a T-shaped branch B5, which are located on the low-frequency annular metal patch 1 and are not connected to the low-frequency annular metal patch 1, and are used to realize capacitive coupling feeding.

[0011] The two feeding probes for high-frequency patch feeding include a high-frequency horizontal polarization feeding unit 14 and a high-frequency vertical polarization feeding unit 15, and the two feeding probes for low-frequency patch feeding include a low-frequency horizontal polarization feeding unit 12 and a low-frequency vertical polarization feeding unit 13. 12 and 13 are a pair of orthogonally distributed feeding probes. If the coordinate origin is located at the center point of the metal floor 3, 12 is located on the positive semi-axis of the horizontal axis of the metal floor 3, 13 is located on the positive semi-axis of the vertical axis of the metal floor 3, and the distance from 12 to the center point of the metal floor 3 is equal to the distance from 13 to the center point of the metal floor 3; 14 and 15 are a pair of orthogonally distributed feeding probes. If the coordinate origin is located at the center point of the metal floor 3, 14 is located on the negative semi-axis of the horizontal axis of the metal floor 3, 15 is located on the negative semi-axis of the vertical axis of the metal floor 3, and the distance from 14 to the center point of the metal floor 3 is equal to the distance from 15 to the center point of the metal floor 3. The feeding probes 12 and 13 pass through the dielectric substrates B17 and A16 from the metal floor 3 and are directly connected to the coupling feeding branches 4 and 5 and are not in contact with the high-frequency metal patch 2. Capacitive coupling feeding of the low-frequency metal patch 1 is achieved through the coupling feeding branches 4 and 5; the low-frequency impedance matching can be adjusted by adjusting the distance. The feeding probes 14 and 15 pass through the metal floor 3 to the dielectric substrate B17 and are not directly connected to the high-frequency patch 2, thereby realizing capacitive coupling feeding. The orthogonally distributed feeding probes 12, 13 and 14, 15 can excite antennas with different polarizations in the corresponding frequency bands. Capacitive coupling feeding can offset the additional inductance introduced by orthogonal coaxial feeding.

[0012] The dielectric substrate B17 is provided with four metalized blind holes A6, B7, C8, and D9, which are located at the four corners of the antenna unit. The blind holes penetrate the dielectric 16 but not the dielectric 17, and are at a distance from the lower surface of the dielectric 17. The blind holes can improve the isolation between different polarization ports in the high frequency band.

[0013] Furthermore, the metal patch 1 is a square ring structure to prevent the upper metal patch 1 from blocking the normal radiation of the lower metal patch 2. The high-frequency metal patch 2 is butterfly-shaped.

[0014] Furthermore, the coupling feeding branches 4 and 5 may be T-shaped, L-shaped, or rectangular.

[0015] Furthermore, the relative dielectric constants of the two dielectric substrates A16 and B17 affect the operating frequency of the antenna and can be adjusted according to frequency requirements.

[0016] Furthermore, in the antenna array, each antenna unit is arranged in the same direction, and a T-shaped gap is etched on the metal floor 3, which can increase the gain of the antenna array and improve the beam scanning performance.

[0017] The application of the present invention is: to improve the antenna gain, N dual-frequency and dual-polarized laminated patch antenna units fed separately form a group of 1×N antenna linear arrays, wherein the arrangement of the N laminated patch antenna arrays is the same, such as Figure 5 As shown, the metal floor can remain intact or have a groove structure. The groove structure can increase the gain of the antenna array and improve the beam scanning performance. The phased array can achieve a larger high gain and wide-angle scanning. The antenna array finally designed can reduce the filter requirements in the circuit and has the advantages of small size, compact structure, dual-polarization bandwidth, and large scanning angle.

[0018] The working process of the present invention is as follows: the external coaxial feeding probes 12 and 13 perform capacitive coupling feeding on the annular metal patch 1 through T-shaped branches A4 and B5 respectively, and the radio frequency signal enters the low-frequency annular metal patch 1 through capacitive coupling, and the resonant frequency of the low-frequency annular metal patch 1 is approximately millimeter wave low frequency, and the surface current is distributed on both sides of the metal ring of the feeding port. The external coaxial feeding probes 14 and 15 perform capacitive coupling feeding on the high-frequency metal patch 2, and the radio frequency signal enters the high-frequency metal patch 2 through capacitive coupling, and the resonant frequency of the high-frequency metal patch 2 is approximately millimeter wave high frequency, and the surface current is distributed on the edge of the patch. The blind hole structures A6, B7, C8, D9 and the through hole structures A10 and B11 increase the isolation between the antenna feeding ports, and the isolation between the feeding ports is higher than 10dB.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) The millimeter wave antenna unit for a 5G mobile terminal described in the present invention adopts two laminated structures of a low-frequency annular metal patch 1 and a high-frequency metal patch 2 to achieve dual-frequency operation, and different polarizations and different frequencies are fed separately, thereby reducing the burden on the millimeter wave circuit, especially the filter.

[0021] (2) Antennas of different frequency bands share the same radiation unit. The antenna structure is compact, small in size, and low in profile, making it suitable for use in the frame of mobile phones such as Qualcomm chips. The antenna array has a stable directional pattern, achieving a win-win situation of dual polarization, wide scanning angle, and small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structural decomposition of the dual-polarized antenna unit with dual-frequency and separate feeding of millimeter-wave proposed by the present invention;

[0023] Figure 2 It is a schematic diagram of a dual-polarized antenna unit with dual frequencies and separate feeding of millimeter waves proposed by the present invention;

[0024] Figure 3 It is a side view of the millimeter wave dual-frequency separately fed dual-polarized antenna unit proposed by the present invention;

[0025] Figure 4 It is a plan view of the upper annular metal patch of the dual-polarized antenna unit with dual-frequency and separate feeding of the millimeter-wave proposed by the present invention;

[0026] Figure 5 It is a plan schematic diagram of the lower high-frequency metal patch of the dual-polarized antenna unit with dual-frequency and separate feeding of the millimeter-wave proposed by the present invention;

[0027] FIG6 is a schematic diagram of the structure of the dual-polarized antenna array with millimeter-wave dual-frequency and separate feeding in the present invention; FIG6(a) is a schematic diagram of the front view of the dual-polarized antenna array with millimeter-wave dual-frequency and separate feeding in the present invention (part of the dielectric layer is hidden); FIG6(b) is a rear view of the dual-polarized antenna array with millimeter-wave dual-frequency and separate feeding in the present invention;

[0028] Figure 7 It is the S parameter of the millimeter wave dual-frequency separately fed dual-polarized antenna unit proposed in the present invention;

[0029] FIG8 is a two-dimensional radiation pattern of the dual-polarized antenna unit with dual-frequency separate feeding of the millimeter-wave proposed in the present invention; FIG8(a) is a directional pattern of the E-plane and H-plane of the dual-polarized antenna unit with dual-frequency separate feeding of the millimeter-wave proposed in the present invention when fed at a low-frequency feeding port; FIG8(b) is a directional pattern of the E-plane and H-plane of the dual-polarized antenna unit with dual-frequency separate feeding of the millimeter-wave proposed in the present invention when fed at a high-frequency feeding port at 39 GHz;

[0030] Figure 9 is the S parameter of the dual-polarization 4-element antenna array with millimeter-wave dual-frequency and separate feeding in the present invention; Figure 9(a) is the port reflection coefficient of the dual-polarization 4-element antenna array with millimeter-wave dual-frequency and separate feeding in the present invention. Figure 9(b) is the partial port-to-port transmission coefficient of the dual-polarization 4-element antenna array with millimeter-wave dual-frequency and separate feeding in the present invention;

[0031] 10(a) to (d) are beam scanning angles of the dual-polarization 4-unit antenna array with dual-frequency millimeter-wave feeding in the present invention when the antenna is fed with a 28 GHz horizontal polarization port, a 28 GHz vertical polarization port, a 39 GHz horizontal polarization port, and a 39 GHz vertical polarization port;

[0032] In the figure: 1 low-frequency annular metal patch, 2 high-frequency metal patch, 3 metal floor, 4 T-shaped branch A, 5 T-shaped branch B, 6 blind hole A, 7 blind hole B, 8 blind hole C, 9 blind hole D, 10 through hole A, 11 through hole B, 12 low-frequency horizontal polarization feed unit, 13 low-frequency vertical polarization feed unit, 14 high-frequency horizontal polarization feed unit, 15 high-frequency vertical polarization feed unit, 16 dielectric substrate A, 17 dielectric substrate B. DETAILED DESCRIPTION

[0033] The specific implementation scheme of the present invention is described in detail below in conjunction with the accompanying drawings and technical solutions of the specification.

[0034] See also Figure 1 , Figure 2 , Figure 3 The millimeter-wave dual-frequency dual-polarized antenna unit with separate feeding is composed of two layers of dielectric substrates, a metal floor, two antenna radiation patch units, four blind holes, two vias, two T-shaped branches and a feeding structure, wherein the antenna radiation unit includes a metal ring patch 1 and a butterfly-shaped metal patch 2. The ring metal patch 1 is placed on the upper surface of the upper dielectric substrate A16, the butterfly-shaped metal patch 2 is located on the upper surface of the lower dielectric substrate B17, and the lower surface of the lower dielectric substrate B17 is a metal floor 3. Blind holes 6, 7, 8, and 9 are located at the four corners of the antenna unit. The blind holes penetrate the dielectric 16 but not the dielectric 17, and are 0.236 mm away from the lower surface of the dielectric 17. Through holes 10 and 11 connect the lower butterfly-shaped metal patch 2 and the metal floor 3, and are 0.8 mm away from the center point of the butterfly-shaped patch 2. Feed probes 12 and 13 are respectively located in the horizontal and vertical directions of the antenna unit, 1.9 mm away from the center point of the upper annular metal patch 1; feed probes 14 and 15 are respectively located in the horizontal and vertical directions of the antenna unit, 0.7 mm away from the center point of the lower butterfly-shaped metal patch 2. The horizontal and vertical dual-polarization characteristics of the antenna are realized by using an orthogonal distribution feeding method. Two T-shaped branches 4 and 5 are located in the plane where the upper annular metal patch 1 is located, and are used to connect the low-frequency feeding probes 12 and 13 and the annular metal patch 1 respectively. The annular metal patch 1 and the butterfly-shaped metal patch 2 work in the low-frequency and high-frequency bands of the millimeter wave respectively, and the antenna resonance point can be adjusted by adjusting the patch size. T-shaped branches 4 and 5 do not directly contact the annular metal patch 1, but maintain a distance of 0.1 mm; on the lower butterfly-shaped metal patch 2, a circle with a radius slightly larger than the probe radius is cut off at the center of the feeding probe. These two methods realize capacitive coupling feeding to offset the additional inductance introduced by orthogonal coaxial feeding.

[0035] The overall size of the millimeter wave dual-frequency separately fed dual-polarized antenna unit is about 5×5×1.3 mm 3. The outer length L1 of the metal patch 1 is 2.5mm, and the length L2 of the cut rectangular patch is 1.85mm. The outer length L3 of the metal patch 2 is 2.2mm, and the radius R3 of the chamfered circle at the four right angles is 0.7mm. The diameter R1 of the four blind holes 6, 7, 8, and 9 is 0.6mm. The radius of the two vias 10 and 11 is 0.15mm. In order to realize the coaxial capacitive feeding method, a circle with a radius R2 of 0.2mm is dug out at the center of the probe circle of the lower patch 2; the distance W1 between the upper patch 1 and the T-shaped branch is 0.1mm. The material used for the dielectric substrate A16 and the dielectric substrate B17 is TLY-5, with a relative dielectric constant of 2.2, a loss tangent of 0.0009, and thicknesses of 0.254mm and 1.016mm respectively.

[0036] The dual-frequency separately fed dual-polarized millimeter-wave laminated patch antenna unit is fed through a coaxial connector, and the obtained S parameters are shown in Figure 6. From the figure, it can be seen that the antenna unit generates resonance points at about 28 GHz in the low frequency band and about 38 GHz in the high frequency band, the -10 dB operating frequency band ranges from 24.5 to 30 GHz and 36 to 43.8 GHz, the port isolation within the frequency band is greater than 10 dB, and the dual-band wideband characteristics are achieved.

[0037] 8(a) to (b) are the radiation patterns of the E-plane and H-plane of the dual-polarized antenna unit with dual-frequency feeding of the millimeter wave proposed in the present invention at 28 GHz and 38 GHz. It can be seen that the radiation of the antenna unit is all zenith radiation, and the gain is greater than 5 dB.

[0038] Figure 6 (a) to (b) are schematic diagrams of the structure of the dual-polarized antenna array with dual-frequency separate feeding of the millimeter wave of the present invention (the upper dielectric layer is hidden). The array is composed of the aforementioned antenna units arranged in 1×4, and a T-shaped slot is etched on the metal floor. The horizontal length L5 of the T-shaped slot is 1.6mm, the vertical length L6 is 0.9mm, and the width W2 is 0.2mm. The T-shaped slot can increase the gain of the antenna array and improve the array beam scanning performance. The overall size of the array is 20×5×1.3mm 3 . To improve the antenna gain, four millimeter-wave dual-frequency dual-polarized antenna units fed separately are combined into a 1×4 antenna linear array, in which the four stacked patch antenna units are arranged in the same way and the distance between the antenna units is 5mm. High gain and wide-angle scanning are achieved through phased array. The antenna array finally designed has the advantages of small size, compact structure, wide dual-polarized bandwidth and large scanning angle.

[0039] Figure 9 is the S parameter result of the millimeter wave dual-frequency separately fed dual-polarized antenna array proposed by the present invention as shown in Figure 6, Figure 9 (a) is the reflection coefficient of the antenna array port; Figure 9 (b) is the transmission coefficient between the antenna array ports. The antenna array can operate at 26-29.2GHz and 36.2-42.8GHz, and the isolation between the ports is better than 10dB.

[0040] Figures 10(a) to (d) are the beam scanning angle results of the dual-frequency separately fed dual-polarized stacked patch antenna array proposed in the present invention as shown in Figure 6 when fed by the low-frequency 28GHz horizontal polarization feeding port, the low-frequency 28GHz vertical polarization feeding port, the high-frequency 39GHz horizontal polarization feeding port, and the high-frequency 39GHz vertical polarization feeding port, and the 3dB scanning angles are ±50°, ±50°, -45° to 31° and -30° to 36°, respectively.

[0041] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A millimeter wave dual-frequency dual-polarization antenna array with separate feeding, characterized in that: The dual-polarized antenna array is composed of a plurality of antenna units with the same structure arranged and combined, and each antenna comprises two dielectric layers, three metal layers, two feeding probes for low-frequency patch feeding, two feeding probes for high-frequency patch feeding, and two coupling feeding branches; wherein the two dielectric layers comprise an upper dielectric substrate A (16) and a lower dielectric substrate B (17), and the three metal layers comprise a low-frequency annular metal patch (1), a high-frequency metal patch (2), and a metal floor (3); The low-frequency annular metal patch (1) is located on the upper surface of the dielectric substrate A (16) and is used to generate low-frequency resonance. The low-frequency operating frequency is adjusted by adjusting the size of the low-frequency annular metal patch (1); the high-frequency metal patch (2) is located on the upper surface of the lower dielectric substrate B (17) and is used to generate high-frequency resonance. The high-frequency operating frequency is adjusted by adjusting the patch size and chamfer. The lower dielectric substrate B (17) is placed on the metal floor (3); the electrical length of the high-frequency metal patch (2) is smaller than that of the low-frequency annular metal patch (1); The metal floor (3) is provided with six through holes, four of which are used to pass through four feeding probes respectively. The high-frequency horizontal polarization feeding unit (14) and the high-frequency vertical polarization feeding unit (15) for feeding the high-frequency metal patch (2) will continue to pass through the dielectric substrate B (17), and the feeding probe for feeding the low-frequency annular metal patch (1) will continue to pass through the dielectric substrates B (17) and A (16). The other two through holes are metallized through holes (10) and (11). The high-frequency metal patch (2) and the metal floor (3) are connected through the metallized through holes (10) and (11), so that the isolation between ports with different polarizations in the low frequency band can be improved. The two coupling feeding branches include a T-shaped branch A (4) and a T-shaped branch B (5), which are located on the low-frequency annular metal patch (1) and are not connected to the low-frequency annular metal patch (1) and are used to realize capacitive coupling feeding; The two feeding probes for high-frequency patch feeding include a high-frequency horizontal polarization feeding unit (14) and a high-frequency vertical polarization feeding unit (15), and the two feeding probes for low-frequency patch feeding include a low-frequency horizontal polarization feeding unit (12) and a low-frequency vertical polarization feeding unit (13); wherein the low-frequency horizontal polarization feeding unit (12), the low-frequency vertical polarization feeding unit (13), the high-frequency horizontal polarization feeding unit (14), and the high-frequency vertical polarization feeding unit (15) are orthogonally distributed; the low-frequency horizontal polarization feeding unit (12) and the low-frequency vertical polarization feeding unit (13) penetrate through dielectric substrates B (17) and A (16) from the metal floor (3) and are directly connected to T-shaped branches A (4) and T-shaped branches B (5) and are not connected to the high-frequency metal patch. (2) contact, realizing capacitive coupling feeding of the low-frequency annular metal patch (1) through T-shaped branch A (4) and T-shaped branch B (5); adjusting the low-frequency impedance matching by adjusting the distance; the high-frequency horizontal polarization feeding unit (14) and the high-frequency vertical polarization feeding unit (15) penetrate from the metal floor (3) to the dielectric substrate B (17), and are not directly connected to the high-frequency metal patch (2), so as to realize capacitive coupling feeding; the orthogonally distributed low-frequency horizontal polarization feeding unit (12), low-frequency vertical polarization feeding unit (13) and high-frequency horizontal polarization feeding unit (14), high-frequency vertical polarization feeding unit (15) can excite antennas with different polarizations in corresponding frequency bands; capacitive coupling feeding can offset the additional inductance introduced by orthogonal coaxial feeding; Four metalized blind holes are arranged at the four corners of the dielectric substrate B (17), and four through holes are arranged at positions corresponding to the blind holes on the dielectric substrate A (16).

2. A millimeter wave dual-frequency separately fed dual-polarized antenna array according to claim 1, characterized in that: The low-frequency annular metal patch (1) is a circular ring or a square ring.

3. The millimeter wave dual-frequency separately fed dual-polarized antenna array according to claim 1, characterized in that: The high-frequency metal patch (2) is in the shape of a square, a rectangle, a circle or a butterfly.

4. A millimeter wave dual-frequency separately fed dual-polarized antenna array according to claim 2 or 3, characterized in that: The low-frequency annular metal patch (1) is a square annular structure, which prevents the upper low-frequency annular metal patch (1) from blocking the normal radiation of the lower high-frequency metal patch (2); the high-frequency metal patch (2) is butterfly-shaped.

5. The millimeter wave dual-frequency separately fed dual-polarized antenna array according to claim 1, characterized in that: The T-shaped branch A (4) and the T-shaped branch B (5) are T-shaped, L-shaped or rectangular.

6. A millimeter wave dual-frequency separately fed dual-polarized antenna array according to claim 1, characterized in that: In the antenna array, each antenna unit is arranged in the same direction, and a T-shaped gap is etched on the metal floor (3), which can increase the gain of the antenna array and improve the beam scanning performance.

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