K / Ka band circularly polarized transmit-receive co-boresight phased array antenna and phased array

Abstract

The application discloses a K / Ka-band circularly polarized transceiving common-aperture phased array antenna and phased array, comprising: a multilayer stacked substrate structure, the substrate comprising a metal layer, a dielectric layer and an adhesive layer; a K-band array element comprising a K-band radiation patch arranged on part of the metal layer, a K-band feeding structure and a K-band filtering structure, the K-band filtering structure comprising a first filtering structure, a second filtering structure and a third filtering structure; a Ka-band array element comprising a Ka-band parasitic patch arranged on part of the metal layer, a Ka-band radiation patch and a Ka-band filtering structure; each common-aperture phased array antenna comprises one K-band array element and five Ka-band array elements. The common-aperture antenna provided by the application can meet the requirement of realizing a conical surface wide-angle scanning in the K / Ka-band, and meanwhile, the problems of poor common-aperture antenna same-frequency and different-frequency isolation and poor circularly polarized array scanning axial ratio performance are overcome.

Description

TECHNICAL FIELD

[0001] The application relates to the field of communication, in particular to a K / Ka-band circularly polarized transceiving common-aperture phased array antenna and phased array. BACKGROUND

[0002] In recent years, a low-orbit satellite communication system has been widely concerned with the development of millimeter wave technology. The millimeter wave communication has the advantages of wide working frequency band, large communication capacity and high transmission quality. The combination of the millimeter wave communication and the low-orbit satellite communication system with the characteristics of low transmission time delay and low path loss is a development direction of a new type of satellite mobile communication system, and is also an important part of the current space-air-ground integrated system.

[0003] Compared with a traditional phased array antenna, a spaceborne phased array antenna has more restrictions and higher performance index requirements. The specific design requirements are as follows: 1. The phased array antenna carried on a satellite needs to adopt a common-aperture phased array antenna to improve the space utilization rate due to the space and weight restrictions; 2. The phased array antenna carried on a low-orbit satellite needs to have a wide-angle scanning capability due to the requirement of a large coverage range of the low-orbit satellite communication; and 3. The common-aperture phased array antenna needs to have good inter-frequency isolation performance to realize full-duplex transceiving.

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

[0005] In order to overcome the above-mentioned defects and deficiencies of the prior art, the purpose of the application is to provide a K / Ka-band circularly polarized transceiving common-aperture phased array antenna and phased array.

[0006] The antenna has high isolation and wide-angle scanning characteristics, and is used to solve the problems that the existing common-aperture antenna cannot simultaneously meet the requirements of large-angle conical surface scanning, high transceiving channel isolation, low profile, low cost and easy integration.

[0007] The purpose of the application is achieved by the following technical scheme.

[0008] A K / Ka-band circularly polarized transceiving common-aperture phased array antenna comprises:

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

[0010] A K-band array element comprises a K-band radiating patch, a K-band feeding structure and a K-band filtering structure 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;

[0011] The Ka-band array element comprises a Ka-band parasitic patch, a Ka-band radiation patch and a Ka-band filter structure arranged on a partial metal layer.

[0012] Each of the co-boresight phased array antennas comprises one K-band array element and five Ka-band array elements.

[0013] Further, the multilayer stacked substrate structure comprises, 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 is etched with a Ka-band parasitic patch.

[0015] The second metal layer is etched with 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 is etched with a second filter structure.

[0017] The fifth metal layer is etched with a K-band feed structure, a third filter structure and a Ka-band filter structure.

[0018] Further,

[0019] The feed port of the K-band feed structure is connected with the third filter structure, and the metallized via connected with the K-band feed structure penetrates through the sixth metal layer to serve as a K-band feed interface integrated with the radio frequency backend;

[0020] The Ka-band feed metallized via is connected with the Ka-band radiation patch and penetrates through the sixth metal layer to serve as a Ka-band feed interface integrated with the radio frequency backend, and the Ka-band feed interface is connected with the Ka-band filter structure.

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

[0022] Further, the K-band radiation patch is in a circular ring shape, and the first filter structure comprises four T-shaped structures uniformly arranged on the circumference of the circular ring.

[0023] Further, the second filter structure is in a circular ring shape, four K-band feed metallized vias are connected with the second filter structure, and the four K-band feed metallized vias are used to connect the K-band radiation patch and a K-band strip-line one-to-four series feed network located in the fifth metal layer, and are used to excite the K-band radiation patch.

[0024] Further, the third filter structure is in a non-closed loop structure and is composed of a parallelly connected open strip line and a short strip line.

[0025] Further, a metal shielding structure is further included, the metal shielding structure includes two parts, one part is a short ground metallization via arranged between the K-band array element and the Ka-band array element, the short ground metallization via is multiple, and part of the short ground metallization via serves as a shielding back cavity structure shared by the K-band antenna and the Ka-band antenna, and part of the short ground metallization via is distributed around the K-band antenna to serve as a back cavity structure of the isolated Ka-band antenna;

[0026] Another part is a short ground metallization via arranged in a square around the K-band array element, adjacent short ground metallization vias are connected through copper sheets in the second metal layer, and the short ground metallization vias are connected with the back cavity structure of the isolated Ka-band antenna to jointly constitute a back cavity structure of the K / Ka-band shared aperture antenna.

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

[0028] Further, 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 in the K-band array element.

[0029] A phased array includes the circularly polarized transceiving shared aperture phased array antenna arranged in an array.

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

[0031] (1) The application provides a circularly polarized transceiving shared aperture phased array antenna with high isolation and wide angle scanning characteristics in K / Ka bands, which only uses two types of via structures, and only needs to be pressed twice in the PCB manufacturing process, after the first pressing, the first type of metallization via is drilled, and after the second pressing is completed, the second type of metallization via is processed in the form of back drilling, which simplifies the processing flow and reduces the manufacturing cost.

[0032] (2) The application adopts a "plug-in" design of high-frequency insertion into low-frequency to integrate K-band antenna units and Ka-band units, and the array elements are closely arranged to avoid the generation of grating lobes and realize wide-angle scanning; the array elements of each frequency band are designed with filter structures and loaded at appropriate positions to improve the isolation performance of the hetero-frequency channel and reduce the space occupation.

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

[0034] Figure 1 Figure 1 is a side view of a K / Ka-band circularly polarized transceiving common aperture phased array antenna according to an embodiment of the application;

[0035] Figure 2 Figure 2 is a side view of a K-band array element according to an embodiment of the application;

[0036] Figure 3 Figure 3 is a side view of a Ka-band array element according to an embodiment of the application;

[0037] Figure 4 Figure 4 is a partial K / Ka-band array element interleaving view according to an embodiment of the application

[0038] Figure 5(a) and Figure 5(b) are top views of a K-band array element metal shielding structure and a Ka-band array element metal shielding structure according to an embodiment of the application;

[0039] Figure 6 Figure 6 is a maximum gain curve of a K-band array element loaded with a filter structure according to an embodiment of the application;

[0040] Figure 7 Figure 7 is a maximum gain curve of a Ka-band array element loaded with a filter structure according to an embodiment of the application;

[0041] Figure 8 Figure 8 is an S parameter curve of a K / Ka-band circularly polarized transceiving common aperture phased array antenna element with high isolation and wide angle scanning characteristics according to an embodiment of the application;

[0042] Figure 9 Figure 9 is an arbitrary large phased array composed of K / Ka-band array elements according to an embodiment of the application. DETAILED DESCRIPTION

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

[0044] It should be noted that the following detailed description is only intended to illustrate the basic concept of the application, and therefore the drawings only show the structures related to the application and not the actual implementation of the specific structures, sizes and scales, and the actual implementation of the specific architecture, quantity and size relationship can be arbitrarily changed.

[0045] Embodiment 1

[0046] As Figure 1As shown, a K / Ka band circularly polarized transceiving co-aperture phased array antenna has high isolation and wide angle scanning characteristics, and the array surface medium thickness is only 1.9 mm without considering the back-end integration, which is less than one quarter of the highest operating frequency 30 GHz, and it is a transceiving co-aperture antenna array surface with low profile and high integration characteristics. Figure 1 As shown, a K / Ka band circularly polarized transceiving co-aperture phased array antenna has high isolation and wide angle scanning characteristics, and the array surface medium thickness is only 1.9 mm without considering the back-end integration, which is less than one quarter of the highest operating frequency 30 GHz, and it is a transceiving co-aperture antenna array surface with low profile and high integration characteristics.

[0047] As shown, a K / Ka band circularly polarized transceiving co-aperture phased array antenna has high isolation and wide angle scanning characteristics, and the array surface medium thickness is only 1.9 mm without considering the back-end integration, which is less than one quarter of the highest operating frequency 30 GHz, and it is a transceiving co-aperture antenna array surface with low profile and high integration characteristics. Figure 1 As shown, a K / Ka band circularly polarized transceiving co-aperture phased array antenna has high isolation and wide angle scanning characteristics, and the array surface medium thickness is only 1.9 mm without considering the back-end integration, which is less than one quarter of the highest operating frequency 30 GHz, and it is a transceiving co-aperture antenna array surface with low profile and high integration characteristics.

[0048] The antenna array surface has only two types of via structures, the first type is the first type of via structure 14 located in the second metal layer 4 and penetrating to the sixth metal layer 13, and the second type is the second type of via structure 15 located in the fifth metal layer 11 and penetrating to the sixth metal layer 13.

[0049] The first type of via structure 14 penetrates from the second metal layer to the sixth metal layer, and its functions include: constituting a part 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, the via penetrates through the third and fifth metal layers but does not connect with the copper skin located in these two metal layers; as a multiplexing back cavity structure of K band antenna and Ka band, connecting 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 located in the sixth metal layer, the via penetrates through the third and fifth metal layers but does not connect with the copper skin located in these two metal layers; as a feed metallization via of K band radiation patch, connecting the K band radiation patch and K band first filter structure of the second metal layer, and connecting the K band second filter structure of the third metal layer, penetrating through the upper ground plane of the fourth metal layer without being connected thereto, connecting the K band feed structure and K band third filter structure located in the fifth metal layer, and finally penetrating to the sixth metal layer without being connected to the lower ground plane located in the sixth metal layer; as a feed probe of Ka band radiation patch, connecting the Ka band radiation patch located in the second metal layer, penetrating through the third and fourth metal layers without connecting with the copper skin of these two layers, connecting with the Ka band filter structure of the fifth metal layer, and finally penetrating to the sixth metal layer as a Ka band antenna signal input port without connecting with the lower ground plane of the sixth metal layer;

[0050] The second type of via structure penetrates the fifth metal layer to the sixth metal layer, and its functions include: a feed probe of the K-band feed structure and being connected with the K-band third filter structure of the fifth metal layer, a K-band antenna signal input port, and not being connected with the lower ground plane of the sixth metal layer.

[0051] As shown in the drawings, Figure 2 The K-band array element includes a K-band radiation patch arranged on a part of metal layers, a K-band feed structure, and a K-band filter structure, the K-band filter structure includes a first filter structure, a second filter structure, and a third filter structure, and the K-band feed structure is a strip-line one-to-four series feed network.

[0052] The K-band radiation patch 16 is etched on the second metal layer 4, and the 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 uniformly loaded on the K-band radiation patch. Four K-band feed metallized vias 17 are connected to the strip-line 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 via 17 is connected to the second filter structure 20 located on the third metal layer 7. The second filter structure is a circular ring.

[0053] It is particularly pointed out that the K-band feed metallized via 17 is a first type of metal via structure 14. The feed metallized via 17 is four, which are uniformly arranged on the circular ring part 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 strip-line one-to-four series feed network located on the fifth metal layer, for exciting the K-band radiation patch. In addition to the metal structures described above, the K-band feed metallized via 17 is not connected with the remaining metal layers through which it passes.

[0054] The feed metallized via 23 of the K-band feed structure 21 is connected with the third filter structure. The metallized via 23 connected with the K-band feed structure penetrates the sixth metal layer and does not contact the sixth metal layer 13 to serve as a K-band feed interface integrated with the radio frequency back end. The metallized via is a second type of metallized via 15.

[0055] The fourth metal layer 9 and the sixth metal layer 13 constitute the upper and lower ground planes of the strip-line structure of the fifth metal layer 11. The ground planes located on the fourth metal layer and the sixth metal layer are metal copper skin structures, covering the entire common aperture antenna array, and simultaneously serving as the upper and lower ground planes of the K-band feed structure. Part of the feed vias penetrates the two planes but is not connected with them.

[0056] The strip-line-one-into-four series feeding network 21 in the fifth metal layer 11 is designed with 90° progressive phase length, which can divide the input signal into four output signals with 90° phase difference to realize right-hand circularly polarized radiation in K band.

[0057] The third filter structure composed of parallel open-circuit strip line 22 and short-circuit strip line 24 is loaded at the feeding port 23 of the strip-line-one-into-four series feeding network, wherein the open-circuit strip line has an electrical length of 90° and an impedance of 50 ohms, and the short-circuit strip line 24 is connected to the grounded metal back cavity 30 and has an electrical length of 45° and an impedance of 50 ohms.

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

[0059] As shown in Figure 3 , the Ka band array element includes a Ka band parasitic patch, a Ka band radiation patch and a Ka band filter structure arranged on partial metal layers.

[0060] The Ka band parasitic patch 25 is etched on the first metal layer 1 and is circular in shape; the Ka band radiation patch 26 is etched on the second metal layer 4 and is a cut-corner circular patch. By adjusting the sizes of the Ka band parasitic patch 25 and the Ka band radiation patch 26 and the distance between the two patches, i.e. the thickness of the first dielectric layer 2, the coupling between the two patches can be controlled, thereby expanding the operating bandwidth and axial ratio bandwidth of the Ka band antenna.

[0061] A metalized via 27 connected to the second metal layer radiation patch 26 and penetrating through to the sixth metal layer but not in contact with the sixth metal layer serves as a Ka band feeding interface of the antenna integrated with the radio frequency back end, and the Ka band feeding interface is connected to a Ka band filter structure composed of two parallel open-circuit strip lines at the fifth metal layer 11. The metalized via belongs to the first type of via structure 14; the Ka band filter structure composed of two parallel unequal-length open-circuit strip lines loaded on the fifth metal layer 11 is connected to the metalized via 27, wherein the open-circuit strip line 28 has an electrical length of 90° and an impedance of 50 ohms, and the open-circuit strip line stub 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 in the first metal layer and a radiation patch in the second metal layer; the radiation patch generates circular polarization characteristics through the way of cutting angle and expands the bandwidth through the parasitic patch of the first metal layer; the Ka-band antenna is provided with a metalized shielding hole structure around and a Ka-band filtering structure in the fifth metal layer; a metal probe belonging to the first type of metal via structure is connected to the Ka-band radiation patch in the second metal layer to excite the antenna, is not directly connected with the parasitic patch in the first metal layer, penetrates through the third and fourth metal layers without being connected with these metal layers, is connected with the Ka-band filtering structure in the fifth metal layer, and finally penetrates to the sixth metal layer as the signal input port of the Ka-band antenna without being connected with the lower ground plane in the sixth metal layer.

[0064] Figure 4 The partial array element structure explosion diagram of the proposed K / Ka-band transceiving common aperture antenna is shown. Figure 2 The K-band array element structure is shown in the middle, and the center is placed Figure 3 The Ka-band array element structure is shown, and four isolated Ka-band array elements are loaded around the K-band array element structure, which makes the Ka-band array element realize triangular arrangement, and the K-band array element is arranged according to the square rule; in addition, the K-band array element is loaded with a metal back cavity structure composed of short-circuit metalized vias 18 and 30, and the metalized vias surround the K-band and Ka-band array elements and are periodically distributed.

[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 patch.

[0066] The upper view of the metal shielding structure is shown in FIG. 5, and the left drawing takes the K-band array element as the center, and there is a circle of regular short ground metalized via 18 between the K-band antenna and the Ka-band antenna, which connects the second metal layer 4, the fourth metal layer 9 and the sixth metal layer 13, and is the first type of metal via structure 14; the short ground metalized via is multiple, and part of the short ground metalized via is a shielding back cavity structure shared by the K-band antenna and the Ka-band antenna, and the part is arranged between the radiation patches of the two bands and is uniformly arranged in the K-band radiation patch ring.

[0067] FIG. 5(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 metalized vias 18 and 30 distributed around the K-band antenna, and two short ground metalized vias are a group, a total of four groups, which are arranged between the Ka-band antenna and the K-band antenna at four corners.

[0068] Figure 5(a) is a square arrangement of short-circuit metalized via 30 around the K-band, connected by copper skin, 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 part of the short-circuit metalized via 18, and together constitutes the back cavity structure of the K / Ka-band shared aperture antenna.

[0069] The short-circuit metalized via is four groups, each group is arranged between adjacent Ka-band antennas.

[0070] Further, each shared aperture antenna includes one K-band element and five Ka-band elements, the K-band antenna element is located in the middle part of the laminated structure, and the Ka-band antenna is inserted into the K-band antenna and distributed around the K-band antenna; the K-band antenna is uniformly arranged with a unit distance greater than 0 and rotated according to a square rule to form an array; the Ka-band antenna is uniformly arranged with a unit distance greater than 0 and 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] Further, the K-band antenna elements are arranged at regular intervals, and the interval is less than 0.5 times the working center frequency wavelength to avoid the appearance of grating lobes in the scanning interval, and the metal shielding structure is always in the center position of the K-band element or around the K-band element, and adjacent K-band elements share part of the metal shielding structure.

[0072] Further, the Ka-band antenna elements are always arranged at regular intervals in the center position of the K-band antenna element or around the K-band antenna element, and the interval is less than 0.5 times the working center frequency wavelength to avoid the appearance of grating lobes in the scanning interval. Among them, there is always a circular ring-shaped closed metal shielding structure around the Ka-band element.

[0073] Further, the K-band third filter structure is composed of a short-circuit strip line and a open-circuit strip line in parallel, and the specific implementation form is not fixed, and the filtering performance is determined by the length of the strip line; the Ka-band filter structure is composed of two open-circuit strip lines in parallel, and the filtering performance is determined by the length of the strip line, and the structure of the strip line is not fixed.

[0074] The antenna only uses 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 metalized via is drilled, and after the second pressing is completed, the second type of metalized via is processed in the form of back drilling.

[0075] The preferred values in the embodiment are:

[0076] The typical thickness values of the design are as follows: the first metal layer 1 has a thickness of 0.035 mm, the first dielectric layer 2 has a thickness of 0.51 mm, the first adhesive layer 3 has a thickness of 0.1 mm, the second metal layer 4 has a thickness of 0.035 mm, the second dielectric layer 5 has a thickness of 0.51 mm, the second adhesive layer 6 has a thickness of 0.2 mm, the third metal layer 7 has a thickness of 0.035 mm, the third dielectric layer 8 has a thickness of 0.25 mm, the fourth metal layer 9 has a thickness of 0.035 mm, the third adhesive layer 10 has a thickness of 0.2 mm, the fifth metal layer 11 has a thickness of 0.035 mm, the fourth dielectric layer 12 has a thickness of 0.13 mm, and the sixth metal layer 13 has a thickness of 0.035 mm. In this embodiment, the dielectric substrate is of the Taconic TSM-DS3 type, and the adhesive layer is of the FR-28 type. It should be noted that the antenna examples described in the present application can be implemented using substrates and adhesive layers of other types, which have the same or different dielectric constants.

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

[0078] Embodiment 2

[0079] A phased array includes a circularly polarized transceiving co-antenna phased array antenna as described in embodiment 1, as shown in Figure 9 .

[0080] As can be seen from the above, the present application realizes higher inter-frequency channel isolation through highly integrated filter structures and metal shielding structures, and realizes better antenna matching performance on the basis of ensuring the transceiving isolation performance, thereby overcoming the problems of low transceiving channel isolation, narrow bandwidth, and limited scanning angle of the conventional co-antenna phased array.

[0081] The above embodiments are the preferred embodiments of the present application, but the embodiments of the present application are not limited by the above embodiments, and any changes, modifications, substitutions, combinations, simplifications, etc. made without departing from the spirit and principles of the present application shall be equivalent replacement manners and shall be included in the protection scope of the present application.

Claims

1. A circularly polarized transmit-receive co-boresight phased array antenna in K / Ka band, characterized in that, The application relates to a multi-layer stacked substrate structure, and a K-band and Ka-band antenna element. The multi-layer stacked substrate structure comprises a metal layer, a dielectric layer and an adhesive layer. The K-band array element comprises a K-band radiation patch, a K-band feed structure and a K-band filter structure arranged on part of the metal layer. The Ka-band array element comprises a Ka-band parasitic patch, a Ka-band radiation patch and a Ka-band filter structure arranged on part of the metal layer. The multi-layer stacked substrate structure comprises, 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 is etched with a Ka-band parasitic patch. The second metal layer is etched with 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 is etched with a second filter structure. The fifth metal layer is etched with a K-band feed structure, a third filter structure and a Ka-band filter structure. The feed port of the K-band feed structure is connected with the third filter structure, and a metalized via connected with the K-band feed structure penetrates through the sixth metal layer to serve as a K-band feed interface integrated with a radio frequency back end. A Ka-band feed metalized via is connected with the Ka-band radiation patch and penetrates through the sixth metal layer to serve as a Ka-band feed interface integrated with the radio frequency back end, and the Ka-band feed interface is connected with the Ka-band filter structure. The fourth metal layer and the sixth metal layer serve as shielding ground for the fifth metal layer. The K-band radiation patch is in a circular ring shape, and the first filter structure comprises four T-shaped structures which are uniformly arranged on the circumference of the circular ring. The second filter structure is in a circular ring shape, four K-band feed metalized vias are connected with the second filter structure, and the four K-band feed metalized vias are used for connecting the K-band radiation patch and a K-band strip-line one-to-four series feed network located in the fifth metal layer and used for exciting the K-band radiation patch. There are two types of via structures, the first type of via structure is located in the second metal layer and penetrates through the second metal layer to the sixth metal layer, and the second type of via structure is located in the fifth metal layer and penetrates through the fifth metal layer to the sixth metal layer, the K-band feed metalized via, the short-circuit ground metalized via and the Ka-band feed metalized via belong to the first type of via structure, and the K-band feed interface belongs to the second type of via structure. Only two pressing processes are needed in the PCB manufacturing process, drilling of the first type of metalized via is performed after the first pressing process, and processing of the second type of metalized via is completed in the form of back drilling after the second pressing process is completed. The Ka-band array element is provided with a parasitic patch in the first metal layer and a radiation patch in the second metal layer, the radiation patch generates circular polarization characteristics through angle cutting, the size of the parasitic patch and the radiation patch and the distance between the two patches, i.e. the thickness of the first dielectric layer, can be adjusted to control the coupling between the two patches, so as to expand the working bandwidth and axial ratio bandwidth of the Ka-band antenna.

2. The circularly polarized transmit-receive co -aperture phased array antenna of claim 1, wherein, The third filter structure is an open loop structure, which is composed of open-circuit strip lines and short-circuit strip lines connected in parallel.

3. The circularly polarized transmit-receive co -aperture phased array antenna of claim 1, wherein, The metal shielding structure includes two parts, one part is a short-circuit metal via hole arranged between the K-band array element and the Ka-band array element, the short-circuit metal via hole is multiple, and part of the short-circuit metal via hole is used as a shielding back cavity structure shared by the K-band antenna and the Ka-band antenna, and part of the short-circuit metal via hole is distributed around the K-band antenna to form a back cavity structure for the isolated Ka-band antenna. The other part is a short-circuit metal via hole arranged in a square around the K-band array element, adjacent short-circuit metal via holes are connected by copper sheets in the second metal layer, which are connected with the isolated Ka-band antenna back cavity structure to form a back cavity structure of the K / Ka-band shared aperture antenna.

4. The circularly polarized transmit-receive co -aperture phased array antenna of claim 1, wherein, Each shared aperture phased array antenna includes one K-band array element and five Ka-band array 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 the four corner positions of the multi-layer stacked substrate structure, and one is arranged in the K-band array element.

5. A phased array, characterized by, The circularly polarized transceiving shared aperture phased array antenna includes an array of the circularly polarized transceiving shared aperture phased array antenna according to any one of claims 1-4.

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