K / Ka wave band circular polarization transmit-receive common aperture phased array antenna and phased array

Abstract

The invention discloses a K / Ka band circularly polarized transmit-receive common aperture phased array antenna and phased array, comprising: a multilayer stacked substrate structure, the substrate comprising a metal layer, a dielectric layer and a bonding layer; the K-band array element comprises a K-band radiation patch, a K-band feed structure and a K-band filtering structure, the K-band radiation patch, the K-band feed structure and the K-band filtering structure are arranged on part of the metal layer, and the K-band filtering structure comprises a first filtering structure, a second filtering structure and a third filtering structure; the Ka wave band array element comprises a Ka wave band parasitic patch, a Ka wave band radiation patch and a Ka wave band filtering structure which are arranged on part of the metal layer; each common-aperture phased-array antenna comprises a K-band array element and five Ka-band array elements. The common-caliber antenna provided by the invention can realize conical wide-angle scanning in the K / Ka wave band, and solves the problems of poor same-frequency and different-frequency isolation of the common-caliber antenna and poor scanning axial ratio performance of a circular polarization array.

Description

Technical Field

[0001] The present invention relates to the field of communications, and in particular to a K / Ka band circularly polarized transceiver co-aperture phased array antenna and a phased array. Background Art

[0002] In recent years, low-orbit satellite communication systems have received widespread attention with the development of millimeter wave technology. Millimeter wave communication has the advantages of wide operating frequency band, large communication capacity, and high transmission quality. Combining it with low-orbit satellite communication systems with low transmission delay and low path loss is a development direction of new satellite mobile communication systems, and is also an important part of the currently proposed space-ground integrated system.

[0003] Compared with traditional phased array antennas, satellite-borne phased array antennas are subject to more restrictions and higher performance requirements. The specific design requirements are as follows: 1. The phased array antennas carried on satellites are limited by space and weight, and co-aperture phased array antennas are required to improve space utilization; 2. Low-orbit satellite communications usually require a large coverage range, which requires the phased array antennas carried on them to have wide-angle scanning capabilities; 3. Co-aperture phased array antennas need to have good frequency isolation performance to achieve full-duplex transmission and reception.

[0004] At present, the common K / Ka common-aperture phased array antenna has the problems of limited scanning angle and poor transmit-receive isolation. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, an object of the present invention is to provide a K / Ka band circularly polarized transmit-receive co-aperture phased array antenna and a phased array.

[0006] The antenna of the present invention has high isolation and wide-angle scanning characteristics, and is used to solve the problem that existing common-aperture antennas cannot simultaneously meet the requirements of large-angle conical scanning, high isolation of transceiver channels, low profile, low cost, and easy integration.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A K / Ka band circularly polarized transmitting and receiving co-aperture phased array antenna, comprising:

[0009] A multi-layer stacked substrate structure, wherein the substrate comprises a metal layer, a dielectric layer and an adhesive layer;

[0010] A K-band array element includes a K-band radiation patch, a K-band feeding structure and a K-band filtering structure arranged on a partial metal layer, wherein the K-band filtering structure includes a first filtering structure, a second filtering structure and a third filtering structure;

[0011] Ka-band array element, including a Ka-band parasitic patch, a Ka-band radiation patch and a Ka-band filtering structure arranged on a part of the metal layer;

[0012] Each co-aperture phased array antenna includes one K-band element and five Ka-band elements.

[0013] Further, the multi-layer stacked substrate structure includes, from top to bottom, a first metal layer, a first dielectric layer, a first adhesive layer, a second metal layer, a second dielectric layer, a second adhesive layer, a third metal layer, a third dielectric layer, a fourth metal layer, a third adhesive layer, a fifth metal layer, a fourth dielectric layer and a sixth metal layer;

[0014] The first metal layer etches a Ka-band parasitic patch;

[0015] The second metal layer etches a K-band radiation patch and a Ka-band radiation patch, and the first filter structure is loaded on the K-band radiation patch;

[0016] The third metal layer etches the second filter structure;

[0017] The fifth metal layer etches a K-band feeding structure, a third filtering structure and a Ka-band filtering structure.

[0018] further,

[0019] The feeding port of the K-band feeding structure is connected to the third filtering structure, and the metallized via connected to the K-band feeding structure penetrates the sixth metal layer and serves as a K-band feeding interface integrated with the RF back end;

[0020] The Ka-band feed metallized via is connected to the Ka-band radiation patch and penetrates to the sixth metal layer, serving as a Ka-band feed interface integrated with the RF back-end, and the Ka-band feed interface is connected to the Ka-band filter structure;

[0021] The fourth metal layer and the sixth metal layer are configured as shielding grounds for the fifth metal layer.

[0022] Furthermore, the K-band radiation patch is in a circular ring shape, and the first filtering structure includes four T-shaped structures, and the four T-shaped structures are evenly arranged on the circumference of the ring.

[0023] Furthermore, the second filtering structure is in a circular ring shape, and four K-band feed metalized vias are connected to the second filtering structure. The four K-band feed metal vias are used to connect the K-band radiation patch and the K-band stripline one-to-four series feeding network located on the fifth metal layer, which is used to excite the K-band radiation patch.

[0024] Furthermore, the third filtering structure is a non-closed-loop structure, which is composed of an open-circuit stripline and a short-circuit stripline connected in parallel.

[0025] Furthermore, it also includes a metal shielding structure, which includes two parts, one part is a short grounded metallized via arranged between the K-band array element and the Ka-band array element, the short grounded metallized via is multiple, and some of the short grounded metallized vias serve as a shielding back cavity structure shared by the K-band antenna and the Ka-band antenna, and some of the short grounded metallized vias are distributed around the K-band antenna, which is a back cavity structure of an isolated Ka-band antenna;

[0026] The other part is the short grounding metallized vias arranged in a square shape around the K-band array element. Adjacent short grounding metallized vias are connected by copper foil on the second metal layer, which is connected to the isolated Ka-band antenna back cavity structure, together forming the back cavity structure of the K / Ka-band co-aperture antenna.

[0027] Furthermore, two types of via structures are included. The first type of via structure is located in the second metal layer and passes from the second metal layer to the sixth metal layer; the second type of via structure is located in the fifth metal layer and passes from the fifth metal layer to the sixth metal layer. The K-band feed metal via, short ground metallization via, and Ka-band feed metal via all belong to the first type of via structure; the K-band feed interface belongs to the second type of via structure.

[0028] Furthermore, the K-band array element is located at a central position of the multi-layer stacked substrate structure, four of the five Ka-band array elements are arranged at four corner positions of the multi-layer stacked substrate structure, and one is arranged inside the K-band array element.

[0029] A phased array comprises the circularly polarized transmitting and receiving co-aperture phased array antennas arranged in an array.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] (1) The present invention provides a K / Ka band circularly polarized transceiver co-aperture phased array antenna with high isolation and wide-angle scanning characteristics. The antenna uses only two via structures and only needs to be pressed twice during the PCB manufacturing process. After the first pressing, the first type of metallized vias are drilled. After the second pressing, the second type of metallized vias are processed by back drilling, which simplifies the processing process and reduces the cost of processing and manufacturing.

[0032] (2) The present invention adopts a high-frequency-inserted-low-frequency "flower-inserted" design to integrate the K-band antenna unit with the Ka-band unit. The array elements are closely arranged to avoid the generation of grating lobes and achieve wide-angle scanning. The filter structure of each frequency band array element is designed and loaded at a suitable position to improve the isolation performance of the different frequency channels while reducing the space occupied.

[0033] (3) Compared with the existing common-aperture phased array antenna, the present invention overcomes the problems of high processing cost and difficulty, poor frequency isolation, and limited scanning angle of the millimeter-wave phased array antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a side cross-sectional schematic diagram of a K / Ka band circularly polarized transceiver co-aperture phased array antenna according to an embodiment of the present invention;

[0035] Figure 2 This is a side exploded view of a K-band array element in an embodiment of the present invention;

[0036] Figure 3 This is a side exploded view of a Ka-band array element in an embodiment of the present invention;

[0037] Figure 4 Exploded diagram of interleaving of some K and Ka band array elements in an embodiment of the present invention

[0038] 5(a) and 5(b) are top views of a K-band array element metal shielding structure and a Ka-band array element metal shielding structure in an embodiment of the present invention;

[0039] Figure 6 The maximum gain curve of the K-band array element loading filter structure in the embodiment of the present invention;

[0040] Figure 7 The maximum gain curve of the Ka-band array element loaded with the filter structure in the embodiment of the present invention;

[0041] Figure 8 The S parameter curve of the circularly polarized transmit / receive co-aperture phased array antenna unit with high isolation and wide-angle scanning characteristics in the K / Ka band in an embodiment of the present invention;

[0042] Fig. 9 It is an arbitrary large phased array composed of K / Ka band array elements in the embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0044] It should also be noted that the following specific implementation methods are only used to illustrate the basic concept of the present invention. Therefore, the diagrams only show the structures related to the present invention rather than the specific structures, sizes and scales of the actual implementation. The specific architecture, quantity and size relationship of the actual implementation can be changed arbitrarily.

[0045] Example 1

[0046] like Figure 1As shown in the figure, a K / Ka band circularly polarized co-aperture phased array antenna has high isolation and wide-angle scanning characteristics. Without considering the back-end integration, the array dielectric thickness is only 1.9mm, which is less than a quarter wavelength of the highest operating frequency of 30GHz. It is a co-aperture antenna array with low profile and high integration. Figure 1 As shown, it includes a multi-layer stacked dielectric substrate, a K-band array element, a Ka-band array element and a metal shielding structure.

[0047] The side cross-sectional view of the present invention is as follows Figure 1 As shown, the multi-layer stacked substrate structure is, from top to bottom, a first metal layer 1, a first dielectric layer 2, a first adhesive layer 3, a second metal layer 4, a second dielectric layer 5, a second adhesive layer 6, a third metal layer 7, a third dielectric layer 8, a fourth metal layer 9, a third adhesive layer 10, a fifth metal layer 11, a fourth dielectric layer 12 and a sixth metal layer 13.

[0048] The antenna array of the present invention has only two types of via structures. The first type is a first type via structure 14 located in the second metal layer 4 and extending through the sixth metal layer 13 . The second type is a second type via structure 15 located in the fifth metal layer 11 and extending through the sixth metal layer 13 .

[0049] The first type of via structure 14 passes through the second metal layer to the sixth metal layer, and its functions include: constituting a component of the metal shielding structure, connecting the back cavity copper skin of the second metal layer, the upper ground plane of the fourth metal layer and the lower ground plane of the sixth metal layer, and the via passes through the third and fifth metal layers but is not connected to the copper skin located in these two metal layers; serving as a multiplexed back cavity structure of the K-band antenna and the Ka-band, connecting to the K-band radiation patch located in the second metal layer, connecting the upper ground plane of the fourth metal layer and the lower ground plane of the sixth metal layer, and the via passes through the third and fifth metal layers but is not connected to the copper skin located in these two metal layers; serving as a feed metallized via for the K-band radiation patch, connecting the second metal The first metal layer is connected to the K-band radiation patch and the first K-band filtering structure, and is connected to the K-band second filtering structure of the third metal layer, passes through the upper ground plane of the fourth metal layer without being connected thereto, connects the K-band feeding structure and the K-band third filtering structure located on the fifth metal layer, and finally passes through the sixth metal layer without being connected to the lower ground plane located on the sixth metal layer; as a feeding probe of the Ka-band radiation patch, it is connected to the Ka-band radiation patch located on the second metal layer, passes through the third metal layer and the fourth metal layer without being connected to these two layers of copper, is connected to the Ka-band filtering structure of the fifth metal layer, and finally passes through the sixth metal layer as a Ka-band antenna signal input port without being connected to the lower ground plane of the sixth metal layer;

[0050] The second type of via structure passes through the fifth metal layer to the sixth metal layer, and its functions include: serving as a feeding probe of the K-band feeding structure and being connected to the K-band third filtering structure of the fifth metal layer, serving as a K-band antenna signal input port, and not being connected to the lower ground plane of the sixth metal layer.

[0051] like Figure 2 As shown, the K-band array element includes a K-band radiation patch, a K-band feeding structure and a K-band filtering structure arranged on a partial metal layer. The K-band filtering structure includes a first filtering structure, a second filtering structure and a third filtering structure. The K-band feeding structure is specifically a stripline one-to-four series feeding network.

[0052] A K-band radiation patch 16 is etched on the second metal layer 4, and a first filter structure 19 is directly loaded on the K-band radiation patch. The first filter structure is four symmetrically distributed T-shaped branches, which are evenly loaded on the K-band radiation patch. Four K-band feed metallized vias 17 connect the stripline one-to-four series feed network 21 located on the fifth metal layer 11 and excite the K-band radiation patch 16 located on the second metal layer 4. In addition, the K-band feed metallized vias 17 connect the second filter structure 20 located on the third metal layer 7. The second filter structure is annular.

[0053] It is particularly noted that the K-band feed metallized via 17 is a first type metal via structure 14, and there are four feed metallized vias 17, which are evenly arranged on the annular portion of the K-band radiation patch. The four K-band feed metallized vias 17 are used to connect the K-band radiation patch located on the second metal layer 4, the second filter structure 20 of the third metal layer 7, and the K-band stripline one-to-four series feed network located on the fifth metal layer, which is used to excite the K-band radiation patch. Except for the metal structure already described, the K-band feed metallized via 17 is not connected to the remaining metal layers through which it passes.

[0054] The feeding metallized via 23 of the K-band feeding structure 21 is connected to the third filtering structure. The metallized via 23 connected to the K-band feeding structure passes through the sixth metal layer and does not contact the sixth metal layer 13 as a K-band feeding interface integrated with the RF back-end; the metallized via is a second-type metallized via 15.

[0055] The fourth metal layer 9 and the sixth metal layer 13 constitute the upper and lower ground planes of the stripline structure of the fifth metal layer 11. The ground plane is located on the fourth metal layer and the sixth metal layer and is a metal copper structure, covering the entire co-aperture antenna array surface. It also serves as the upper and lower ground planes of the K-band feeding structure, where some feed vias pass through these two planes but are not connected to them.

[0056] The stripline one-to-four series feeding network 21 located in the fifth metal layer 11 is designed with a 90° progressive phase length, and can equally divide the input signal into four output signals with a 90° phase difference to achieve right-handed circularly polarized radiation in the K band.

[0057] A third filtering structure consisting of an open stripline 22 and a short-circuited stripline 24 in parallel is loaded at the feeding port 23 of the stripline one-to-four series feeding network, wherein the open stripline has an electrical length of 90° and an impedance of 50 ohms, and the short-circuited stripline 24 is a short-circuited stripline connected to the grounded metal back cavity 30, has an electrical length of 45°, and an impedance of 50 ohms.

[0058] Further explanation: The filtering performance of the third filtering structure is determined by the length of these strip lines, and the structure of the strip lines is not fixed.

[0059] like Figure 3 As shown, the Ka-band array element includes a Ka-band parasitic patch, a Ka-band radiation patch and a Ka-band filtering structure arranged on a partial metal layer.

[0060] A Ka-band parasitic patch 25 is etched on the first metal layer 1, and the parasitic patch is circular; a Ka-band radiation patch 26 is etched on the second metal layer 4, and the radiation patch is a cut-corner circular patch. By adjusting the size of the Ka-band parasitic patch 25 and the Ka-band radiation patch 26 and the distance between the two patches, that is, the thickness of the first dielectric layer 2, the coupling between the two patches can be controlled, thereby widening the working bandwidth and axial ratio bandwidth of the Ka-band antenna.

[0061] A metallized via 27 connected to the second metal layer radiation patch 26 and passing through the sixth metal layer but not in contact with the sixth metal layer serves as a Ka-band feeding interface for integrating the antenna with the RF back-end. The Ka-band feeding interface is connected to a Ka-band filtering structure composed of two parallel open strip lines at the fifth metal layer 11, and the metal via belongs to the first type of via structure 14; the Ka-band filtering structure composed of two parallel open strip lines of unequal length loaded on the fifth metal layer 11 is connected to the metallized via 27, wherein the open strip line 28 has an electrical length of 90° and an impedance of 50 ohms, and the open strip line branch 29 has an electrical length of 30° and an impedance of 50 ohms.

[0062] Further explanation:

[0063] The Ka-band array element is provided with a parasitic patch on the first metal layer and a radiating patch on the second metal layer; the radiating patch produces circular polarization characteristics by cutting angles, and widens the bandwidth through the parasitic patch on the first metal layer; the Ka-band antenna is provided with a metallized shielding hole structure around it, and a Ka-band filtering structure is provided on the fifth metal layer, a metal probe belonging to the first type of metal via structure is connected to the Ka-band radiating patch excitation antenna on the second metal layer, and is not directly connected to the parasitic patch on the first metal layer, the probe passes downward through the third and fourth metal layers without being connected to these metal layers, and is connected to the Ka-band filtering structure on the fifth metal layer, and finally passes through the sixth metal layer as the signal input port of the Ka-band antenna, and is not connected to the lower ground plane on the sixth metal layer.

[0064] Figure 4 The exploded diagram of some array elements of the proposed K / Ka band transmit / receive co-aperture antenna is shown. Figure 2 The K-band array element structure shown is placed in the middle, with the center placed Figure 3 The Ka-band array element structure shown has four isolated Ka-band array elements loaded around the K-band array element structure, which enables the Ka-band array elements to be arranged in a triangular array, while the K-band array elements are arranged according to a square rule; in addition, the K-band array element is loaded with a metal back cavity structure composed of short-circuit metallized vias 18 and 30, which surround the K-band and Ka-band array elements and are distributed periodically.

[0065] The K-band third filtering structure and the Ka-band filtering structure are non-closed structures and can be composed of any bent metal patches.

[0066] The top view of the metal shielding structure is shown in Figure 5. The left figure is centered on the K-band array element. There is a circle of regular short grounded metallized vias 18 between the K-band antenna and the Ka-band antenna, connecting the second metal layer 4, the fourth metal layer 9 and the sixth metal layer 13, which is a first-class metal via structure 14. There are multiple short grounded metallized vias, and some of the short grounded metallized vias are shielded back cavity structures shared by the K-band antenna and the Ka-band antenna. This part is arranged between the radiation patches of the two bands and is evenly arranged within the circle of the K-band radiation patch.

[0067] FIG5(b) takes the Ka-band array element as the center and shows the back cavity structure of the isolated Ka-band antenna composed of regular metal vias 18 and 30 distributed around the K-band antenna. Two short grounded metalized vias form a group, with a total of four groups, which are set between the Ka-band antenna and the K-band antenna located at the four corners.

[0068] FIG5(a) shows a circle of short grounded metallized vias 30 arranged in a square shape around the K band, which are connected by copper foil on the second metal layer 4, connecting the second metal layer 4, the fourth metal layer 9 and the sixth metal layer 13, belonging to the first type of via structure 14, which is connected to the isolated Ka-band antenna back cavity structure composed of some short grounded metallized vias 18, and together constitute the back cavity structure of the K / Ka-band co-aperture antenna.

[0069] There are four groups of short grounding metallized vias, and each group is arranged between adjacent Ka-band antennas.

[0070] It is further explained that each co-aperture antenna includes a K-band array element and five Ka-band array elements, the K-band antenna array element is located in the middle part of the laminated structure, and the Ka-band antenna has both a part inserted into the K-band antenna and a part distributed around the K-band antenna; the K-band antennas are evenly arranged at a unit distance greater than 0, and are rotated according to a square rule to form an array; the Ka-band antennas are evenly arranged at a unit distance greater than 0, and are rotated according to a triangular rule to form an array; the K-band antenna works in right-hand circular polarization, and the Ka-band antenna works in left-hand circular polarization.

[0071] Furthermore, the K-band antenna units are arranged at regular intervals, with the interval being less than 0.5 wavelengths of the working center frequency to avoid the appearance of grating lobes in the scanning interval. The metal shielding structure is always around the K-band unit and at the center of the array element, and adjacent K-band array elements share a portion of the metal shielding structure.

[0072] Furthermore, the Ka-band antenna unit is always arranged at a regular interval at the center of the K-band antenna unit or around the K-band antenna unit, and the interval is less than 0.5 wavelength of the working center frequency to avoid the appearance of grating lobes in the scanning interval. There is always a circular closed metal shielding structure around the Ka-band array element;

[0073] Furthermore, the K-band third filtering structure is composed of a short-circuited stripline in parallel with an open-circuited stripline, the specific implementation form is not fixed, and the filtering performance is determined by the length of these striplines; the Ka-band filtering structure is composed of two open-circuited striplines in parallel, the filtering performance is determined by the length of these striplines, and the structure of the striplines is not fixed.

[0074] The antenna uses only two types of via structures and only needs to be pressed twice during the PCB manufacturing process. After the first pressing, the first type of metallized vias are drilled, and after the second pressing, the second type of metallized vias are processed by back drilling.

[0075] The preferred values ​​in this embodiment are:

[0076] Here are the typical thickness values ​​of this design: the thickness of the first metal layer 1 is 0.035mm, the thickness of the first dielectric layer 2 is 0.51mm, the thickness of the first adhesive layer 3 is 0.1mm, the thickness of the second metal layer 4 is 0.035mm, the thickness of the second dielectric layer 5 is 0.51mm, the thickness of the second adhesive layer 6 is 0.2mm, the thickness of the third metal layer 7 is 0.035mm, the thickness of the third dielectric layer 8 is 0.25mm, the thickness of the fourth metal layer 9 is 0.035mm, the thickness of the third adhesive layer 10 is 0.2mm, the thickness of the fifth metal layer 11 is 0.035mm, the thickness of the fourth dielectric layer 12 is 0.13mm, and the thickness of the sixth metal layer 13 is 0.035mm. In this embodiment, the dielectric substrate model used is Taconic TSM-DS3, and the adhesive layer model used is FR-28. It should be noted that the antenna example described in the present invention can still be realized by using other models, substrates and adhesive layers with the same or different dielectric constants.

[0077] Figure 6 The maximum radiation gain curves of the K-band antenna in the high frequency band after loading different filter structures are shown. It can be seen that after integrating the three filter structures into the antenna, the radiation gain in the Ka-band (29.4-31GHz) is suppressed by more than 35dB compared with the radiation gain in the working frequency band; Figure 7 The maximum radiation gain curve of the Ka-band antenna after loading the metal shielding structure and the filtering structure is shown. It can be seen that after integrating the metal shielding structure and the filtering structure, the gain in the K-band (19.6-21.2GHz) is suppressed by more than 28dB compared with the radiation gain in the working frequency band; Figure 8 The S parameter and axial ratio curve of the dual-band antenna unit shown in the specific example is shown. It can be seen that in the low-frequency operating band of 19.6-21.2GHz, the impedance matching of the K-band antenna|S 11 |<-14dB, frequency isolation|S 21 |<-38dB; Impedance matching of Ka-band antenna in the high-frequency operating band of 29.4-31GHz|S 11 |<-14dB, frequency isolation|S 21 |<-44dB.

[0078] Example 2

[0079] A phased array, comprising the circularly polarized transmitting and receiving co-aperture phased array antenna as described in Example 1, Fig. 9 shown.

[0080] In summary, it can be seen that the present invention achieves higher isolation of different frequency channels through a highly integrated filtering structure and a metal shielding structure, and achieves better antenna matching performance on the basis of ensuring the transmission and reception isolation performance, thereby overcoming the problems of low isolation, narrow bandwidth and limited scanning angle of traditional co-aperture phased array transmission and reception channels.

[0081] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A K / Ka band circularly polarized transmit / receive co-aperture phased array antenna, characterized in that: include: A multi-layer stacked substrate structure, wherein the substrate comprises a metal layer, a dielectric layer and an adhesive layer; A K-band array element includes a K-band radiation patch, a K-band feeding structure and a K-band filtering structure arranged on a partial metal layer, wherein the K-band filtering structure includes a first filtering structure, a second filtering structure and a third filtering structure; The Ka-band array element includes a Ka-band parasitic patch, a Ka-band radiation patch and a Ka-band filtering structure arranged on a partial metal layer.

2. The circularly polarized transmitting and receiving co-aperture phased array antenna according to claim 1, characterized in that: The multi-layer stacked substrate structure includes, from top to bottom, a first metal layer, a first dielectric layer, a first adhesive layer, a second metal layer, a second dielectric layer, a second adhesive layer, a third metal layer, a third dielectric layer, a fourth metal layer, a third adhesive layer, a fifth metal layer, a fourth dielectric layer and a sixth metal layer; The first metal layer etches a Ka-band parasitic patch; The second metal layer etches a K-band radiation patch and a Ka-band radiation patch, and the first filter structure is loaded on the K-band radiation patch; The third metal layer etches the second filter structure; The fifth metal layer etches a K-band feeding structure, a third filtering structure and a Ka-band filtering structure.

3. The circularly polarized transmitting and receiving co-aperture phased array antenna according to claim 2, characterized in that: The feeding port of the K-band feeding structure is connected to the third filtering structure, and the metallized via connected to the K-band feeding structure penetrates the sixth metal layer and serves as a K-band feeding interface integrated with the RF back end; The Ka-band feed metallized via is connected to the Ka-band radiation patch and penetrates to the sixth metal layer, serving as a Ka-band feed interface integrated with the RF back-end, and the Ka-band feed interface is connected to the Ka-band filter structure; The fourth metal layer and the sixth metal layer are configured as shielding grounds for the fifth metal layer.

4. The circularly polarized transmitting and receiving co-aperture phased array antenna according to claim 1, characterized in that: The K-band radiation patch is in the shape of a circular ring, and the first filtering structure includes four T-shaped structures, which are evenly arranged on the circumference of the circular ring.

5. The circularly polarized transmitting and receiving co-aperture phased array antenna according to claim 2, characterized in that: The second filtering structure is in a circular ring shape, and four K-band feed metallized vias are connected to the second filtering structure. The four K-band feed metal vias are used to connect the K-band radiation patch and the K-band stripline one-to-four series feeding network located on the fifth metal layer, which is used to excite the K-band radiation patch.

6. The circularly polarized transmitting and receiving co-aperture phased array antenna according to claim 1, characterized in that: The third filtering structure is a non-closed-loop structure, which is composed of an open-circuit stripline and a short-circuit stripline connected in parallel.

7. The circularly polarized transmitting and receiving co-aperture phased array antenna according to any one of claims 1 to 6, characterized in that: It also includes a metal shielding structure, which includes two parts. One part is a short grounded metallized via arranged between the K-band array element and the Ka-band array element. There are multiple short grounded metallized vias, and some of the short grounded metallized vias serve as a shielding back cavity structure shared by the K-band antenna and the Ka-band antenna. Some of the short grounded metallized vias are distributed around the K-band antenna, which is a back cavity structure of an isolated Ka-band antenna. The other part is the short grounding metallized vias arranged in a square shape around the K-band array element. Adjacent short grounding metallized vias are connected by copper foil on the second metal layer, which is connected to the isolated Ka-band antenna back cavity structure, together forming the back cavity structure of the K / Ka-band co-aperture antenna.

8. The circularly polarized transmitting and receiving co-aperture phased array antenna according to claim 7, characterized in that: There are two types of via structures. The first type of via structure is located in the second metal layer and passes from the second metal layer to the sixth metal layer. The second type of via structure is located in the fifth metal layer and passes from the fifth metal layer to the sixth metal layer. The K-band feed metal via, short ground metallization via, and Ka-band feed metal via all belong to the first type of via structure; the K-band feed interface belongs to the second type of via structure.

9. The circularly polarized transmitting and receiving co-aperture phased array antenna according to claim 2, characterized in that: Each co-aperture phased array antenna includes one K-band element and five Ka-band elements; The K-band array element is located at the central position of the multi-layer stacked substrate structure, four of the five Ka-band array elements are arranged at four corner positions of the multi-layer stacked substrate structure, and one is arranged inside the K-band array element.

10. A phased array, characterized in that: A circularly polarized transmitting and receiving co-aperture phased array antenna as described in any one of claims 1 to 9 is arranged in an array.

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