Ku-band dual circularly polarized packaged phased array antenna

Abstract

The application provides a KU frequency band double circularly polarized packaged phased array antenna, comprising n antenna units, wherein n is a positive integer greater than or equal to 2; the antenna unit comprises, from top to bottom, a first dielectric plate, a second dielectric plate, a third dielectric plate and a fourth dielectric plate, a first metal radiation patch connected to the upper surface of the first dielectric plate, a second metal radiation patch connected to the upper surface of the second dielectric plate, a metal ground connected to the upper surface of the third dielectric plate, a metal isolation strip connected to the edge of the upper surface of the first dielectric plate and a metal bridge connected to the upper surface of the fourth dielectric plate. The antenna unit is designed into a double feed double circularly polarized form by using a multi-layer patch form, and the use of radio frequency connectors and radio frequency cables is reduced through packaging technology, thereby solving the problem of excessive loss and difference of radio frequency signals and improving the scanning characteristics of the whole array; in order to realize the wide scanning angle characteristics of the array, the antenna needs to be designed to be small in size, and the unit spacing of the array elements is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a KU-band dual-circularly polarized packaged phased array antenna. BACKGROUND

[0002] With the continuous development of phased array technology, the demand for phased array antennas in the field of communication is also increasing, among which low profile, multiple polarization and large scanning angle have become the key research direction.

[0003] Traditional active phased array antennas mostly use cable connection for RF signal transmission. In actual use, the size and loss are large, and it is difficult to control the requirement of equal amplitude and in-phase, which brings great difficulty to the system structure design and the beam pointing of the whole array. High integration packaging technology can efficiently connect the antenna and the component part, improve the portability of the whole array system, and greatly reduce the antenna profile height, which has become one of the research directions of phased array antennas.

[0004] In the current various communication and broadcast services, the polarization form is various. The adoption of dual-circular polarization design can more effectively improve the signal receiving capacity, and in order to expand the spatial coverage range of signal detection, it is necessary to improve the scanning range of the phased array. Due to the compact structure of the packaged antenna and the low profile, it is a difficult problem to realize dual-circular polarization and wide scanning angle.

[0005] Therefore, there is a need for an antenna that can realize dual-circular polarization and wide scanning angle. SUMMARY

[0006] The present application is to solve the problem of dual-circular polarization and wide scanning angle, and provides a KU-band dual-circularly polarized packaged phased array antenna. The antenna unit is designed in a dual-feed dual-circularly polarized form using a multi-layer patch form, and the use of RF connectors and RF cables is reduced through packaging technology, thereby solving the problem of excessive loss and difference of RF signals and improving the scanning characteristics of the whole array. In order to realize the wide scanning angle characteristics of the array, the antenna needs to be miniaturized and the unit spacing of the array elements needs to be reduced. The present application overcomes the disadvantage of excessive port coupling and improves the performance of the phased array antenna. The antenna in the present application can have extensible characteristics and can be used as a subarray in different arrays, thereby meeting the requirements of multiple scenes, multiple targets and multiple platforms.

[0007] The present application provides a KU-band dual-circularly polarized packaged phased array antenna, which comprises n antenna units, n being a positive integer greater than or equal to 2; the antenna unit comprises a first dielectric plate, a second dielectric plate, a third dielectric plate and a fourth dielectric plate arranged in order from top to bottom, a first metal radiation patch connected to the upper surface of the first dielectric plate, a second metal radiation patch connected to the upper surface of the second dielectric plate, a metal ground connected to the upper surface of the third dielectric plate, a metal isolation strip connected to the edge of the upper surface of the first dielectric plate, and a metal bridge connected to the upper surface of the fourth dielectric plate.

[0008] The first metal radiation patch and the second metal radiation patch are located at the center of the antenna unit, form a double-layer stacked microstrip antenna and perform double circular polarization radiation, and the metal isolation band surrounds the first metal radiation patch;

[0009] The metal bridge is a strip-line bridge, is connected with the second metal radiation patch through a metal via hole and performs switching of double circular polarization;

[0010] The first dielectric plate, the second dielectric plate, the third dielectric plate and the fourth dielectric plate are connected by semi-solid PP plate compression.

[0011] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, the size of the first metal radiation patch is smaller than the size of the second metal radiation patch.

[0012] The first metal radiation patch is an unequal-sided octagon, and the second metal radiation patch is an equal-sided octagon.

[0013] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, the edge lines of the first metal radiation patch are parallel to the edge lines of the second metal radiation patch.

[0014] The long side of the first metal radiation patch is 2.82 mm, and the short side is 1.6 mm; the side length of the second metal radiation patch is 2.82 mm.

[0015] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, the metal bridge is a 90° bridge.

[0016] The metal bridge comprises a first input port and a second input port located on both sides, a first branch L1 connected with the first input port, a second branch L2 connected with the second input port, a third branch L3 connected between the first branch L1 and the second branch L2, a main branch connected with the first branch L1, the second branch L2 and the third branch L3, and a first output port and a second output port connected with the output end of the main branch, respectively.

[0017] The first branch L1 and the second branch L2 are perpendicular to the main branch; the feeding forms of the first input port and the second input port are coaxial feeding.

[0018] The length of the third branch L3 is one-half wavelength, and a phase difference of 90° can be generated.

[0019] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, the coaxial structure is composed of six equidistant circularly arranged metal columns and a metal column located at the circular point.

[0020] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, further comprises a first metal via hole connecting the fourth dielectric plate and the metal bridge, a second metal via hole connecting the metal isolation belt and the fourth dielectric plate, and a third metal via hole connecting the second metal radiation patch and the metal bridge.

[0021] The first metal via hole introduces the polarization feed into the lower surface of the fourth dielectric plate, and the second metal via hole is uniformly arranged on the metal isolation belt and connects the metal isolation belt and the fourth dielectric plate.

[0022] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, the preparation method of the KU frequency band double circular polarization packaged phased array antenna comprises the following steps:

[0023] S1, connecting the first metal radiation patch on the upper surface of the first dielectric plate, connecting the second metal radiation patch on the upper surface of the second dielectric plate, connecting the metal ground on the upper surface of the third dielectric plate, and connecting the metal bridge on the upper surface of the fourth dielectric plate;

[0024] S2, pressing the first dielectric plate, the second dielectric plate and the third dielectric plate through the semi-solid PP plate;

[0025] S3, perforating the third metal via hole and the first back-drilling hole to obtain a first substructure;

[0026] S4, pressing the first substructure and the fourth dielectric plate again;

[0027] S5, perforating the second back-drilling hole, the first metal via hole and the second metal via hole, and the KU frequency band double circular polarization packaged phased array antenna is prepared.

[0028] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, in step S1, n first metal radiation patches are connected on the upper surface of the first dielectric plate, n second metal radiation patches are connected on the upper surface of the second dielectric plate, n metal grounds are connected on the upper surface of the third dielectric plate, and n metal bridges are connected on the upper surface of the fourth dielectric plate.

[0029] The KU frequency band double circular polarization packaged phased array antenna, as a preferred mode, the KU frequency band double circular polarization packaged phased array antenna comprises n*n antenna units, and the KU frequency band double circular polarization packaged phased array antenna can be expanded into a large array antenna as a subarray antenna; when expanded, the subarray antenna and the subarray radio frequency assembly are pressed and then spliced.

[0030] The KU frequency band double circularly polarized packaged phased array antenna has the advantages that: (1) low profile and compact system structure: on the basis of ensuring that the antenna realizes double circular polarization, the high-gain double-layer patch antenna is designed to be low profile, so that the effective height is reduced; (2) large scanning range: the two input ports of the metal bridge are adjusted, so that the physical distance is far apart, the isolation degree of the input ports is improved, and meanwhile, metal isolation belts and metal isolation columns are added to the antenna, so that the isolation degree between units is improved; and excellent isolation degree enables the antenna array to realize large-angle scanning; (3) solving the problem of line loss: the antenna and the radio frequency component part are press-fit designed, so that the use of cable connectors is reduced, additional loss is reduced, and high gain of the antenna is ensured; (4) low cost: the semi-solid PP plate material with a certain thickness is effectively utilized, so that the semi-solid PP plate material is used as a plate material with a fixed dielectric constant in addition to being used as a press-fit material between core plates; the number of core plates is reduced, the press-fit times in the processing process are reduced, and therefore the processing cost is reduced; (5) stable structure: the plate material with low dielectric constant is used to replace the conventional cavity structure, so that the problems of plate material indentation deformation or even breakage of the antenna in the processing process are avoided.

[0031] The second dielectric plate is a dielectric layer without a cavity.

[0032] The third dielectric plate is made of low-loss m6 material, has a dielectric constant of 3.33 and a thickness of 0.25 mm.

[0033] The center vertical distance between the feeding branch of the metal bridge and the first metal radiation patch is 0.7 mm, and the distance from the center of the metal bridge feeding branch to the center of the second output port is 1.72 mm.

[0034] The KU frequency band double circularly polarized packaged phased array antenna is composed of 4*4 antenna units.

[0035] The KU frequency band double circularly polarized packaged phased array antenna has the advantages that: (1) low profile and compact system structure: on the basis of ensuring that the antenna realizes double circular polarization, the high-gain double-layer patch antenna is designed to be low profile, so that the effective height is reduced; (2) large scanning range: the two input ports of the metal bridge are adjusted, so that the physical distance is far apart, the isolation degree of the input ports is improved, and meanwhile, metal isolation belts and metal isolation columns are added to the antenna, so that the isolation degree between units is improved; and excellent isolation degree enables the antenna array to realize large-angle scanning; (3) solving the problem of line loss: the antenna and the radio frequency component part are press-fit designed, so that the use of cable connectors is reduced, additional loss is reduced, and high gain of the antenna is ensured; (4) low cost: the semi-solid PP plate material with a certain thickness is effectively utilized, so that the semi-solid PP plate material is used as a plate material with a fixed dielectric constant in addition to being used as a press-fit material between core plates; the number of core plates is reduced, the press-fit times in the processing process are reduced, and therefore the processing cost is reduced; (5) stable structure: the plate material with low dielectric constant is used to replace the conventional cavity structure, so that the problems of plate material indentation deformation or even breakage of the antenna in the processing process are avoided.

[0036]

[0037]

[0038]

[0039]

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is an antenna unit packaging stack diagram of a KU frequency band double circularly polarized packaged phased array antenna.

[0042] ​​​​​Figure 2 It is a schematic diagram of an antenna unit overall structure of a KU frequency band double circularly polarized packaged phased array antenna;

[0043] Figure 3 It is a schematic diagram of an array overall structure of a KU frequency band double circularly polarized packaged phased array antenna;

[0044] Figure 4 It is a schematic diagram of a radiation patch structure of a KU frequency band double circularly polarized packaged phased array antenna;

[0045] Figure 5 It is a schematic diagram of a bridge structure of a KU frequency band double circularly polarized packaged phased array antenna;

[0046] Figure 6 It is an active voltage standing wave ratio curve diagram of an embodiment of a KU frequency band double circularly polarized packaged phased array antenna;

[0047] Figure 7 It is a left-handed circularly polarized axial gain-frequency simulation diagram of an array element of an embodiment of a KU frequency band double circularly polarized packaged phased array antenna;

[0048] Figure 8 It is a right-handed circularly polarized axial gain-frequency simulation diagram of an array element of an embodiment of a KU frequency band double circularly polarized packaged phased array antenna;

[0049] Figure 9 It is a scanning characteristic simulation diagram of an array of an embodiment of a KU frequency band double circularly polarized packaged phased array antenna;

[0050] Figure 10 It is an axial ratio-frequency diagram of an array of an embodiment of a KU frequency band double circularly polarized packaged phased array antenna.

[0051] Reference signs:

[0052] 1, first dielectric plate; 2, second dielectric plate; 3, third dielectric plate; 4, fourth dielectric plate; 5, first metal radiation patch; 6, second metal radiation patch; 7, metal ground; 8, metal isolation strip; 9, metal bridge; 91, first input port; 92, second input port; 93, main branch; 94, first output port; 95, second output port; 10, first metal via; 11, second metal via; 12, third metal via; 13, first back drill hole; 14, second back drill hole. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Embodiment 1

[0054] As shown in Figures 1-5 A KU-band dual circularly polarized packaged phased array antenna can include a plurality of sub-arrays, each sub-array containing 4*4 antenna elements. Here, a single antenna element is described as a typical. The antenna element mainly contains a first dielectric plate 1, a second dielectric plate 2, a third dielectric plate 3, a fourth dielectric plate 4, a first metal radiation patch 5, a second metal radiation patch 6, a metal ground 7, a metal isolation strip 8, a metal bridge 9, a first metal via 10, a second metal via 11, a third metal via 12, a first back-drilling hole 13, and a second back-drilling hole 14.

[0055] The second metal radiation patch 6 is located on the upper surface of the second dielectric plate 2, and the first metal radiation patch 5 and the second metal radiation patch 6 are both in the form of an octagonal coupling patch, forming a double-layer stacked microstrip antenna to realize dual circular polarization radiation.

[0056] The metal isolation strip 8 is located on the upper surface of the first dielectric plate 1 and is at the edge of the antenna element and connected to the adjacent array element to improve the port isolation between the array elements.

[0057] The metal bridge 9 is located on the upper surface of the fourth dielectric plate 4 and is in the form of a strip-line bridge, connected to the upper radiation patch through the third metal via 12 to complete the switching of dual circular polarization.

[0058] The first metal via 10 is punched from the bottom of the fourth dielectric plate 4 to the metal bridge 9 to realize the feeding of the array element, and the connection with the radio frequency component part is completed through the multi-layer plate pressing technology.

[0059] The first dielectric plate 1, the second dielectric plate 2, and the third dielectric plate 3 are first pressed, then the first back-drilling hole 13 and the third metal via 12 are punched, and then the fourth dielectric plate 4 is pressed, and the second back-drilling hole 14, the first metal via 10, and the second metal via 11 are punched. The dielectric plates are pressed between each other by semi-solid PP material to realize the packaging design of the antenna.

[0060] The antenna array element number is large, and a sub-array contains 4*4 antenna elements. After the sub-array antenna and the sub-array radio frequency component part are pressed, the sub-array is spliced. The sub-array has an expandable function and can be expanded in multiple modules according to actual needs.

[0061] In this embodiment, the KU-band dual circularly polarized packaged phased array antenna is composed of 4*4 antenna elements and can be expanded as a sub-array to a large array. The antenna element in the present application contains 4 layers of dielectric plates, two of which are metal radiation patches 5 and 6 located on the upper surfaces of the first dielectric plate 1 and the second dielectric plate 2, respectively, the upper surface of the third dielectric plate 3 is covered with a metal ground 7, and the upper surface of the fourth dielectric plate 4 is covered with a metal bridge 9.

[0062] The first metal radiation patch 5 and the second metal radiation patch 6 are located at the center of the antenna unit, wherein the first metal radiation patch 5 is an unequal octagon, the long side is 2.82mm, and the short side is 1.6mm; the second metal radiation patch 6 is an equal octagon, and the length of each side is 2.82mm. The double-layer microstrip antenna structure can effectively expand the antenna bandwidth, reduce the antenna profile height, and realize the miniaturization design of the antenna.

[0063] The upper surface of the first dielectric plate 1 is added with a metal isolation strip 8 and a second metal via 11. The metal isolation strip 8 has a width of 1mm, surrounds the first metal radiation patch 5 at the edge of the antenna unit, and is connected with the adjacent array element isolation strip; the second metal via 11 has a diameter of 0.3mm, and the hole spacing is 1.21mm, which connects the metal isolation strip 8 with the bottom plate (the fourth dielectric plate 4). In this way, the electromagnetic energy of a single array element can be effectively constrained, the isolation between adjacent ports is reduced, and the isolation is improved.

[0064] In the application, a 90° bridge (metal bridge 9) in the form of a strip line is used for feeding, and the 1, 2 stubs (the first stub L1 and the second stub L2) are designed perpendicularly to the main stub 93, which reduces the space size while increasing the isolation of the 1, 2 ports (the first input port 91 and the second input port 92). The feeding form of the bridge input port 1, 2 is coaxial-like feeding, which uses six equidistant circularly arranged metal columns and the metal column located at the dot to jointly form a coaxial-like structure, constrain the long-distance transmission signal, reduce signal leakage, improve the performance of long-distance transmission, and further includes a first output port 94 and a second output port 95. The perpendicular distance between the bridge feeding stub and the patch center is 0.7mm, the distance between the bridge feeding point and the patch center X-axis, Y-axis is 1.72mm, and the length of the second stub L2 is about one-half wavelength, which can generate a phase difference of 90° and determine the axial ratio of the antenna.

[0065] The application uses four layers of dielectric plates, the first dielectric plate 1, the second dielectric plate 2 and the fourth dielectric plate 4 are all made of low-loss m6 material, the dielectric constant is 3.63, the thickness of the first dielectric plate 1 is 1.5mm, the thickness of the second dielectric plate 2 is 0.625mm, and the thickness of the fourth dielectric plate 4 is 0.25mm; the third dielectric plate 3 is made of low-loss m6 material, the dielectric constant is 3.33, and the thickness is 0.25mm. The second dielectric plate 2 replaces the traditional cavity structure, avoids the problems such as plate depression deformation and even fracture of the antenna in the processing process due to the cavity, and improves the stability of the array structure.

[0066] The two polarization feeding parts of the antenna are introduced into the lower surface of the fourth dielectric plate 4 in the form of the first metal via 10, and are effectively connected with the radio frequency components through the pressing technology, which reduces the loss of the radio frequency connector / radio frequency cable and improves the overall performance.

[0067] The overall thickness of the antenna is about 2.65 mm, and the low profile is realized by using a multilayer microstrip stack and a multilayer board packaging compression process. On the basis of ensuring the performance of the antenna, a plurality of back-drilling holes are adopted in the packaging compression process, and a first back-drilling hole 13 and a second back-drilling hole 14 have a hole diameter of 0.35 mm. The second back-drilling hole 14 is aligned with the center of the third metal via hole 12, and the first back-drilling hole 13 is aligned with the center of the first metal via hole 10. In the embodiment, the transverse and longitudinal distances from the center of the second back-drilling hole 14 and the third metal via hole 12 to the nearest edge of the second metal radiation patch 6 are both 1.3 mm.

[0068] The aperture size of the array element is 13.1*13.1 mm, and the array element spacing is selected as 13.1 mm. The array is composed of 4*4 antenna units. According to the working frequency and the array scanning range, a suitable array element spacing is selected. The size of the array element spacing determines whether grating lobes appear during array scanning and deteriorate the scanning characteristics. The array element aperture is the same as the array element spacing, and the compact layout of the array can be realized.

[0069] The effect of the embodiment is shown in Figures 6-10 The reception and transmission of KU band dual circularly polarized signals are realized.

[0070] The original cavity structure is replaced by a cavity-free core plate structure in the application, which avoids problems such as plate depression deformation or even rupture of the antenna during the processing due to the cavity, and facilitates the formation of a larger array based on the antenna unit. The cavity structure antenna unit in the existing patent is usually difficult to form a larger array in actual processing.

[0071] A 3dB-90° bridge is introduced in the application, which can realize dual circular polarization when combined with the radiation patch. Considering the space limitation, the 3dB-90° bridge is deformed.

[0072] The above is only a preferred specific embodiment of the application, but the protection scope of the application is not limited thereto. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and inventive concepts of the application within the technical scope disclosed by the application, which should be covered within the protection scope of the application.

Claims

1. A KU-band dual circularly polarized packaged phased array antenna, characterized in that: The antenna unit comprises n antenna units, n is a positive integer greater than or equal to 2; the antenna unit comprises a first dielectric plate (1), a second dielectric plate (2), a third dielectric plate (3), a fourth dielectric plate (4) arranged in turn from top to bottom, a first metal radiation patch (5) connected to the upper surface of the first dielectric plate (1), a second metal radiation patch (6) connected to the upper surface of the second dielectric plate (2), a metal ground (7) connected to the upper surface of the third dielectric plate (3), a metal isolation strip (8) connected to the edge of the upper surface of the first dielectric plate (1), a metal bridge (9) connected to the upper surface of the fourth dielectric plate (4), a first metal via (10) connecting the fourth dielectric plate (4) and the metal bridge (9), a second metal via (11) connecting the metal isolation strip (8) and the fourth dielectric plate (4), a third metal via (12) connecting the second metal radiation patch (6) and the metal bridge (9), a first back-drilling hole (13) upwardly drilled from the third dielectric plate (3) to the top of the first dielectric plate (1) and the center of which is aligned with the first metal via (10), and a second back-drilling hole (14) penetrating through the fourth dielectric plate (4) and the center of which is aligned with the center of the third metal via (12); The first metal radiation patch (5) and the second metal radiation patch (6) are located at the center of the antenna unit, constitute a double-layer stacked microstrip antenna and perform double circular polarization radiation, and the metal isolation strip (8) surrounds the first metal radiation patch (5); The metal bridge (9) is a strip-line bridge, is connected to the second metal radiation patch (6) through a metal via and performs switching of double circular polarization; The first dielectric plate (1), the second dielectric plate (2), the third dielectric plate (3) and the fourth dielectric plate (4) are connected by semi-solid PP plate compression; The first metal via (10) introduces polarization feed to the lower surface of the fourth dielectric plate (4), and the second metal via (11) is uniformly arranged on the metal isolation strip (8) and connects the metal isolation strip (8) and the fourth dielectric plate (4).

2. The KU-band dual circularly polarized packaged phased array antenna according to claim 1, wherein: The size of the first metal radiation patch (5) is smaller than that of the second metal radiation patch (6); The first metal radiation patch (5) is an unequal-sided octagon, and the second metal radiation patch (6) is an equal-sided octagon.

3. The KU-band dual circularly polarized packaged phased array antenna according to claim 2, characterized in that: The edge lines of the first metal radiation patch (5) are parallel to the edge lines of the second metal radiation patch (6) respectively; The long side of the first metal radiation patch (5) is 2.82 mm, and the short side is 1.6 mm; the side length of the second metal radiation patch (6) is 2.82 mm.

4. The KU-band dual circularly polarized packaged phased array antenna of claim 1, wherein: The metal bridge (9) is a 90° bridge. The metal bridge (9) comprises first input ports (91) and second input ports (92) on both sides, a first branch L1 connected with the first input ports (91), a second branch L2 connected with the second input ports (92), a third branch L3 connected between the first branch L1 and the second branch L2, a main branch (93) connected with the first branch L1, the second branch L2 and the third branch L3, and first output ports (94) and second output ports (95) respectively connected with the output end of the main branch (93). The first branch L1 and the second branch L2 are both perpendicular to the main branch (93); the feeding forms of the first input ports (91) and the second input ports (92) are both coaxial-like feeding. The length of the third branch L3 is one-half wavelength, which can generate a phase difference of 90°.

5. The KU-band dual circularly polarized packaged phased array antenna according to claim 4, characterized in that: The structure of the coaxial-like feeding is composed of six equidistant circularly arranged metal columns and a metal column at the center.

6. The KU-band dual circularly polarized packaged phased array antenna of claim 1, wherein: The preparation method of the KU frequency band double circular polarization packaged phased array antenna comprises the following steps: S1, respectively connecting the first metal radiation patch (5) and the metal isolation band (8) on the upper surface of the first dielectric plate (1), connecting the second metal radiation patch (6) on the upper surface of the second dielectric plate (2), connecting the metal ground (7) on the upper surface of the third dielectric plate (3), and connecting the metal bridge (9) on the upper surface of the fourth dielectric plate (4); S2, pressing the first dielectric plate (1), the second dielectric plate (2) and the third dielectric plate (3) through a semi-solid PP plate; S3, punching the third metal via hole (12) and the first back hole (13) to obtain a first substructure; S4, pressing the first substructure and the fourth dielectric plate (4) again; S5, punching the second back hole (14), the first metal via hole (10) and the second metal via hole (11), and the preparation of the KU frequency band double circular polarization packaged phased array antenna is completed.

7. The KU-band dual circularly polarized packaged phased array antenna of claim 6, wherein: In step S1, n first metal radiation patches (5) are connected on the upper surface of the first dielectric plate (1), n second metal radiation patches (6) are connected on the upper surface of the second dielectric plate (2), n metal grounds (7) are connected on the upper surface of the third dielectric plate (3), and n metal bridges (9) are connected on the upper surface of the fourth dielectric plate (4).

8. The KU-band dual circularly polarized packaged phased array antenna of claim 6, wherein: The KU frequency band double circular polarization packaged phased array antenna comprises n*n antenna units, and the KU frequency band double circular polarization packaged phased array antenna can also be expanded into a large array antenna as a subarray antenna; when expanded, the subarray antenna is pressed with a subarray radio frequency component and then spliced.

9. The KU-band dual circularly polarized packaged phased array antenna of claim 4, wherein: The first dielectric plate (1), the second dielectric plate (2) and the fourth dielectric plate (4) are all low-loss m6 materials with a dielectric constant of 3.63, the thickness of the first dielectric plate (1) is 1.5 mm, the thickness of the second dielectric plate (2) is 0.625 mm, and the thickness of the fourth dielectric plate (4) is 0.25 mm; The second dielectric plate (2) is a dielectric layer without a cavity; The third dielectric plate (3) is a low-loss m6 material with a dielectric constant of 3.33 and a thickness of 0.25 mm; The vertical distance between the feeding branch of the metal bridge (9) and the center of the first metal radiation patch (5) is 0.7 mm, and the distance from the center of the feeding branch of the metal bridge (9) to the center of the second output port (95) is 1.72 mm; The KU-band dual-circularly-polarized packaged phased array antenna is composed of 4*4 antenna units.

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