All-metal dual-frequency dual-polarization dual-suppression common aperture antenna and its array

Abstract

The present invention provides an all-metal dual-frequency dual-polarization dual-suppression common aperture antenna and its array, which relates to the field of antenna technology. In the present invention, an all-metal waveguide structure is adopted, and the all-metal material has the advantages of high radiation efficiency and large power capacity. The antenna is a multi-mode resonant cavity as a whole, and the cross-sectional height is relatively low. A high-frequency coaxial feeding structure and a low-frequency coaxial feeding structure are provided at appropriate positions at the bottom of the multi-mode resonant cavity, and a high-frequency metal tuning column and a low-frequency metal tuning column are provided at the top of the multi-mode resonant cavity to adjust the field distribution characteristics inside the resonant cavity. The high-frequency metal tuning column is regularly distributed on one side of the high-frequency radiation slot, and the low-frequency metal tuning column is regularly distributed on one side of the low-frequency radiation slot. At the same time, a high-frequency radiation slot and a low-frequency radiation slot are opened at the top of the multi-mode resonant cavity, and the two are orthogonally distributed, which is conducive to polarization isolation between the two frequency band antennas.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to an all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna and an array thereof. Background Art

[0002] Currently, demands for increasingly advanced communication system functionality are increasing. Systems often incorporate multiple antennas, each independently transmitting and receiving signals. Simply stacking multiple antennas would inevitably increase system size, which runs counter to the trend toward system miniaturization. Against this backdrop, antenna co-aperture technology has emerged. Co-aperture antenna technology involves placing multiple antennas within a limited space. Through a rational spatial layout, the antennas can be arranged to reduce mutual coupling between antennas operating at different frequencies, while sharing a common aperture to radiate signals, significantly reducing system size. Furthermore, through appropriate design, the polarizations of two antennas operating independently at different frequency bands can be orthogonal. This significantly improves the isolation between the system's receive and transmit signals, thereby meeting the requirements for both system miniaturization and high performance.

[0003] Currently, research on common-aperture antennas focuses primarily on achieving dual-band and dual-polarization capabilities. In 1996, the first common-aperture antenna proposed in the literature (Axness TA, Coffman RV, Kopp BA, et al. Shared Aperture Technology Development [J]. Johns Hopkins APL Technical Digest, 1996, 17(3): 285-294.) was a dual-polarization common-aperture array antenna. This structure achieves dual linear polarization by placing Vivaldi antennas in a vertical cross-shaped arrangement. This structure is large in size and has a high profile, making it unsuitable for planar integration. Due to the advancement of miniaturization and integration, planar structures are considered more suitable for the application of common-aperture antennas. The paper (Zhang Hongtao, Wang Wei, Jin Mouping, and Zou Yongqing. Design of a Dual-Band Dual-Polarized Waveguide Slot Antenna [J]. 2018 National Microwave and Millimeter Wave Conference, Chengdu, Sichuan, China) describes a dual-band dual-polarized waveguide slot antenna for satellite communication systems. The horizontally polarized antenna utilizes a ridged waveguide V-shaped radiating slot, while the vertically polarized antenna utilizes a ridged waveguide longitudinal straight radiating slot. This dual-band dual-polarized waveguide slot antenna consists of four cavity layers and five structural components. The top layer is the radiating slot layer, the second layer is the dual-polarization network hybrid layer, the third layer is the horizontally polarized waveguide network layer, and the bottom layer is the vertically polarized network layer. Clearly, this antenna has too many layers and a complex feed structure, which not only increases the antenna's weight but also increases the machining precision requirements, thereby increasing costs.

[0004] Therefore, most of the dual-frequency, dual-polarization, common-aperture antennas based on existing technologies have complex structures, which are not conducive to miniaturization, low profile, and low-cost applications. Summary of the Invention

[0005] (1) Technical problems solved

[0006] In view of the shortcomings of the existing technology, the present invention provides an all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna and its array, which solves the technical problem of complex feeding structure of dual-frequency dual-polarization common-aperture antenna.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0009] An all-metal dual-frequency, dual-polarization, dual-suppression common-aperture antenna, which adopts an all-metal waveguide structure. The antenna as a whole is a multi-mode resonant cavity, and the multi-mode resonant cavity includes a multi-mode resonant cavity bottom, an outer wall, and a top;

[0010] At the bottom of the multimode resonant cavity, a high-frequency coaxial housing corresponding to the first backplate opening and a low-frequency coaxial housing corresponding to the second backplate opening are provided on the downward side of the metal backplate; the high-frequency coaxial inner core sequentially passes through the high-frequency coaxial housing and the first backplate opening, extending into the space enclosed by the outer wall of the multimode resonant cavity; the low-frequency coaxial inner core sequentially passes through the low-frequency coaxial housing and the second backplate opening, extending into the space enclosed by the outer wall of the multimode resonant cavity;

[0011] At the top of the multi-mode resonant cavity, a metal upper cover is provided with regularly arranged high-frequency radiation slots and low-frequency radiation slots, and the two are arranged orthogonally; on the downward side of the metal upper cover, a high-frequency metal tuning column is provided on one side of each of the high-frequency radiation slots, and a low-frequency metal tuning column is provided on one side of each of the low-frequency radiation slots.

[0012] Preferably, on the upward side of the metal backplate, anti-interference structures that do not conflict with the coaxial feeding structure in space are periodically arranged, and each of the anti-interference structures includes an anti-interference metal column and an anti-interference metal ring, and the interference metal column is nested in the middle of the anti-interference metal ring, and there is a gap between the two.

[0013] Preferably, the anti-interference metal column may be in the shape of a cylinder, a triangular prism or a quadrangular prism; and the anti-interference metal ring may be in the shape of a circular ring, a triangular ring or a square ring.

[0014] Preferably, the non-conflict with the coaxial feeding structure in space specifically refers to:

[0015] Partially cutting the anti-interference metal column and the anti-interference metal ring corresponding to the position of the high-frequency coaxial feeding structure;

[0016] Preferably, the anti-interference metal column corresponding to the location of the low-frequency coaxial feeding structure is removed.

[0017] Preferably, the all-metal dual-frequency dual-polarization dual-suppression common aperture antenna has a square aperture as a whole, and the frequency ratio of the low-frequency antenna to the high-frequency antenna is 1:2.

[0018] Preferably, the low-frequency radiation slots are in a 2×2 array, and the high-frequency radiation slots are in a 4×4 array.

[0019] Preferably, the gap unit spacings of the low-frequency radiation slots in two mutually perpendicular arrangement directions are equal, and / or the gap unit spacings of the high-frequency radiation slots in two mutually perpendicular arrangement directions are equal.

[0020] Preferably, after the metal back plate is divided into sixteen equal parts, the first back plate opening is opened in the middle area of ​​any one of the six parts; after the metal back plate is divided into four equal parts, the second back plate opening is opened in the middle area of ​​any one of the six parts;

[0021] Preferably, air medium is used between any coaxial inner core and the corresponding coaxial outer shell;

[0022] Preferably, the shape of any metal tuning column includes a quadrangular prism, a triangular prism or a cylinder;

[0023] Preferably, in terms of positional relationship, any metal tuning column is adjacent to the corresponding radiation slot, or is separated from the corresponding radiation slot by an appropriate distance, wherein the appropriate distance means that the distance between the high-frequency metal tuning column and the high-frequency radiation slot does not exceed one-eighth of the side length of the multi-mode resonant cavity, and the distance between the low-frequency metal tuning column and the low-frequency radiation slot does not exceed one-quarter of the side length of the multi-mode resonant cavity;

[0024] Preferably, the slit form selected for any radiation slit includes a straight slit, an elliptical slit or an H-shaped slit.

[0025] An all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna array comprises a plurality of all-metal dual-frequency dual-polarization dual-suppression common-aperture antennas as described above, wherein the antennas are arranged in a rectangular grid.

[0026] Preferably, the rectangular grid array has a size of 6×6;

[0027] Preferably, based on the milling process, the all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna array is integrally processed and formed.

[0028] (3) Beneficial effects

[0029] The present invention provides an all-metal dual-frequency, dual-polarization, dual-suppression common-aperture antenna and its array. Compared with the existing technology, it has the following advantages:

[0030] The present invention adopts an all-metal waveguide structure and is made of all-metal materials, which has the advantages of high radiation efficiency and large power capacity. The antenna is a multi-mode resonant cavity as a whole, with a low cross-sectional height. A high-frequency coaxial feeding structure and a low-frequency coaxial feeding structure are arranged at appropriate positions at the bottom of the multi-mode resonant cavity, and a high-frequency metal tuning column and a low-frequency metal tuning column are arranged at the top of the multi-mode resonant cavity to adjust the field distribution characteristics within the resonant cavity. The high-frequency metal tuning columns are regularly distributed on one side of the high-frequency radiation slot, and the low-frequency metal tuning columns are regularly distributed on the other side of the low-frequency radiation slot. At the same time, a high-frequency radiation slot and a low-frequency radiation slot are opened at the top of the multi-mode resonant cavity, and the two are orthogonally distributed, which is conducive to polarization isolation between the two frequency band antennas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 An exploded diagram of an all-metal dual-frequency, dual-polarization, dual-suppression, common-aperture antenna provided by an embodiment of the present invention;

[0033] Figure 2 A side view of the three-dimensional structure of an all-metal dual-frequency, dual-polarization, dual-suppression common-aperture antenna provided by an embodiment of the present invention (after explosion);

[0034] Figure 3 A top view of the first layer structure of an all-metal dual-frequency, dual-polarization, dual-suppression, common-aperture antenna provided in an embodiment of the present invention;

[0035] Figure 4 A side view of the first layer structure of an all-metal dual-frequency, dual-polarization, dual-suppression common aperture antenna provided by an embodiment of the present invention;

[0036] Figure 5 for Figure 3 A top view of the local area structure shown;

[0037] Figure 6 for Figure 3 A local area structure physical model shown;

[0038] Figure 7 for Figure 3 B is a top view of the local area structure shown;

[0039] Figure 8 for Figure 3B is the physical model of the local area structure shown;

[0040] Figure 9 for Figure 3 The top view of the structure of the local area C shown;

[0041] Figure 10 for Figure 3 The physical model of the local area structure of C shown;

[0042] Figure 11 A schematic diagram of the second-layer three-dimensional structure of an all-metal dual-frequency, dual-polarization, dual-suppression common-aperture antenna provided in an embodiment of the present invention;

[0043] Figure 12 A schematic diagram of the third layer three-dimensional structure of an all-metal dual-frequency dual-polarization dual-suppression common aperture antenna provided in an embodiment of the present invention;

[0044] Figure 13 A top view of the third layer structure of an all-metal dual-frequency, dual-polarization, dual-suppression, common-aperture antenna provided in an embodiment of the present invention;

[0045] Figure 14 A side view of the third layer structure of an all-metal dual-frequency, dual-polarization, dual-suppression, common-aperture antenna provided by an embodiment of the present invention;

[0046] Figure 15 Schematic diagram of the electric field distribution of the dual-coaxial-fed high-order mode resonant multi-mode resonant cavity during high-frequency excitation according to the first embodiment of the present invention;

[0047] Figure 16 Schematic diagram of the electric field distribution of the dual-coaxial-fed high-order mode resonant multi-mode resonant cavity during low-frequency excitation according to the first embodiment of the present invention;

[0048] Figure 17 This is a schematic diagram of an all-metal dual-frequency, dual-polarization, dual-suppression common-aperture antenna array. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0050] The embodiments of the present application provide an all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna and its array, thereby solving the technical problem of the complex feeding structure of the dual-frequency dual-polarization common-aperture antenna, significantly reducing the design and processing costs of the antenna, and facilitating the miniaturization and low-profile realization of the antenna.

[0051] The technical solution in the embodiments of the present application is to solve the above technical problems, and the overall idea is as follows:

[0052] In an embodiment of the present invention, an all-metal waveguide structure is used, made of all-metal materials, and has the advantages of high radiation efficiency and large power capacity. The antenna as a whole is a multi-mode resonant cavity with a low cross-sectional height. A high-frequency coaxial feeding structure and a low-frequency coaxial feeding structure are provided at appropriate positions at the bottom of the multi-mode resonant cavity, and a high-frequency metal tuning column and a low-frequency metal tuning column are provided at the top of the multi-mode resonant cavity to adjust the field distribution characteristics inside the resonant cavity. The high-frequency metal tuning columns are regularly distributed on one side of the high-frequency radiation slot, and the low-frequency metal tuning columns are regularly distributed on one side of the low-frequency radiation slot. At the same time, a high-frequency radiation slot and a low-frequency radiation slot are opened at the top of the multi-mode resonant cavity, and the two are orthogonally distributed, which is conducive to polarization isolation between the two frequency band antennas.

[0053] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0054] Example 1:

[0055] like Figures 1-2 As shown, an embodiment of the present invention provides an all-metal dual-band, dual-polarization, dual-suppression common-aperture antenna. This all-metal waveguide structure offers advantages such as high radiation efficiency and large power capacity. The antenna consists of only one cavity layer, minimizing its profile. For ease of description, the antenna is divided into three layers: from bottom to top, it includes the multimode resonant cavity bottom 1, outer wall 2, and top 3.

[0056] like Figures 3-4 As shown, at the bottom 1 of the multimode resonant cavity, a high-frequency coaxial housing 105-2 corresponding to the first backplate opening 105-3 and a low-frequency coaxial housing 106-2 corresponding to the second backplate opening 106-3 are provided on the downward side of the metal backplate 101; the high-frequency coaxial inner core 105-1 sequentially passes through the high-frequency coaxial housing 105-2 and the first backplate opening 105-3, extending into the space enclosed by the outer wall 2 of the multimode resonant cavity; the low-frequency coaxial inner core 106-1 sequentially passes through the low-frequency coaxial housing 106-2 and the second backplate opening 106-3, extending into the space enclosed by the outer wall 2 of the multimode resonant cavity;

[0057] At the top 3 of the multi-mode resonant cavity, a metal upper cover 301 is provided with regularly arranged high-frequency radiation slots 302 and low-frequency radiation slots 304, and the two are arranged orthogonally, which is conducive to polarization isolation between the two frequency band antennas; the downward side of the metal upper cover 301 is provided with a high-frequency metal tuning column 303 located on one side of each of the high-frequency radiation slots 302, and a low-frequency metal tuning column 305 located on one side of each of the low-frequency radiation slots 304. The high-frequency metal tuning column 303 and the low-frequency metal tuning column 305 are used to adjust the field distribution characteristics inside the resonant cavity.

[0058] It is not difficult to understand that the low frequency and high frequency mentioned in the above solution are a set of relative concepts and do not involve specific frequency values. Those skilled in the art can choose according to actual needs.

[0059] Furthermore, as electromagnetic environments become increasingly complex, communication systems are highly susceptible to electromagnetic interference. Traditionally, interference suppression has been achieved by cascading filters at the antenna end. While this approach offers some filtering effectiveness, the cascaded antenna and filter design not only adds additional insertion loss but also increases system size and design complexity. Furthermore, there are few reports on dual-band, dual-polarization, co-aperture antennas with robust interference resistance.

[0060] In order to solve the above technical problems, in an optional embodiment, as Figures 5-6 As shown, on the upward side of the metal backplate 101, anti-interference structures that do not conflict with the coaxial feeding structure in space are periodically arranged. Each anti-interference structure includes an anti-interference metal column 102 and an anti-interference metal ring 104. The interference metal column 102 is nested in the middle of the anti-interference metal ring 104, with a gap 103 between the two. The anti-interference metal column 102 can be higher or lower than the anti-interference metal ring 104, or it can be equal.

[0061] In order to avoid the spatial conflict between the high frequency coaxial core 105-1 and the anti-interference structure, in an optional embodiment: Figures 7-8 As shown, the anti-interference metal column 102 and the anti-interference metal ring 104 at the corresponding position are cut so that the high-frequency coaxial core 105-1 is not affected. In order to more clearly show the structure of the local area B, Figure 8 The corresponding physical model is given.

[0062] In order to avoid the spatial conflict between the low-frequency coaxial core 106-1 and the anti-interference structure, in an optional embodiment: Figures 9-10 As shown, the anti-interference metal column 102 at the corresponding position is removed so that the low-frequency coaxial core 106-1 is not affected. In order to more clearly show the structure of the C local area, Figure 10 The corresponding physical model is given.

[0063] Of course, it is not difficult to understand that the above are only two ways to achieve that the anti-interference structure does not conflict with the coaxial feeding structure in space, and it does not mean that they constitute the only two options. Other alternative methods that can achieve that the two do not conflict in space should also be understood to fall within the scope of protection required by this application.

[0064] Based on electromagnetic principles, the metal ring and metal pillar can be considered two metamaterial structures with different diameters and heights. Their top surfaces act as ideal magnetic conductors within two specific frequency bands, suppressing the propagation of electromagnetic waves within those bands while having no effect on electromagnetic waves in other frequency bands. Based on this structure, the antenna has at least two anti-interference bands.

[0065] In an optional embodiment, the anti-interference metal column 102 may be shaped like a cylinder, a triangular prism, or a quadrangular prism; and the anti-interference metal ring 104 may be shaped like a circular ring, a triangular ring, or a square ring.

[0066] By embedding a simple periodic structure within the antenna, the antenna is endowed with anti-interference capabilities in two different frequency bands. Compared to the traditional method of cascading filters at the end of the antenna, the embodiments of the present invention can effectively avoid cascade losses while also reducing the system size to a certain extent. Therefore, the co-aperture antenna provided by the embodiments of the present invention has the electromagnetic characteristics of dual-frequency, dual-polarization operation and dual-frequency anti-interference.

[0067] In an optional embodiment, if Figure 3 As shown, after the metal back plate 101 is divided into sixteen equal parts, the first back plate opening 105-3 is opened in the middle area of ​​any one part; after the metal back plate 101 is divided into four equal parts, the second back plate opening 106-3 is opened in the middle area of ​​any one part.

[0068] In an optional embodiment, air or other filling media may be used between any coaxial inner core and the corresponding coaxial outer shell.

[0069] In an optional embodiment, the three-dimensional structure diagram of the multi-mode resonant cavity outer wall 2 is as follows: Figure 11 shown.

[0070] In an optional embodiment, if Figures 12-14 As shown, the shapes of any metal tuning column located on the downward side of the metal upper cover plate 301 include quadrangular prism, triangular prism, cylinder, etc.

[0071] The antenna provided in the embodiment of the present invention has two anti-interference frequency bands, but according to specific application requirements, the type, quantity and arrangement of the anti-interference metal pillars 102 or the anti-interference metal rings 104 can also be increased to obtain more anti-interference frequency bands.

[0072] In an optional embodiment, in terms of positional relationship, such as Figures 12-13 As shown, any metal tuning column is adjacent to the corresponding radiation slot, or is separated from the corresponding radiation slot by an appropriate distance, where the appropriate distance means that the distance between the high-frequency metal tuning column 303 and the high-frequency radiation slot 302 does not exceed one-eighth of the side length of the multi-mode resonant cavity, and the distance between the low-frequency metal tuning column 305 and the low-frequency radiation slot 304 does not exceed one-quarter of the side length of the multi-mode resonant cavity.

[0073] In an optional embodiment, if Figures 12-13 As shown, the slot forms selected for any radiation slot include straight slot, elliptical slot, H-type slot, etc.

[0074] To explain the working principle of this antenna, Figure 15 and Figure 16 Schematic diagrams of the electric field distribution of the dual-coaxial fed multimode resonant cavity under high-frequency excitation and low-frequency excitation are given respectively.

[0075] When the electromagnetic signal enters the multi-mode resonant cavity from the high-frequency coaxial feeding structure, a regular high-frequency standing wave array can be formed. Figure 15 As shown (taking the 20 GHz excitation field distribution as an example), the high-frequency radiation slot 302 is located exactly at the antinode of the corresponding high-frequency standing wave array, and the high-frequency electromagnetic wave is radiated into space through the amplitude and phase adjustment of the high-frequency metal tuning column 303. The low-frequency radiation slot 304 is located at the node of the high-frequency standing wave array and does not radiate high-frequency electromagnetic waves outward.

[0076] When the electromagnetic signal enters the multi-mode resonant cavity from the low-frequency coaxial feeding structure, a regular low-frequency standing wave array can be formed. Figure 16 As shown (using the 10 GHz excitation field distribution as an example), the low-frequency radiation slot 304 is located precisely at the antinode of the corresponding low-frequency standing wave array. Through the amplitude and phase modulation of the low-frequency metal tuning rod 305, the low-frequency electromagnetic waves are radiated into space. Although the high-frequency radiation slot 302 is not located at a node of the low-frequency standing wave array, according to electromagnetic principles, the electric fields at adjacent high-frequency radiation slots 302 cancel each other out. Furthermore, the high-frequency radiation slot 302 is relatively short, making it less likely to produce low-frequency resonance. Therefore, the low-frequency electromagnetic waves within the resonant cavity are primarily radiated into space through the low-frequency radiation slot 304.

[0077] Since the high-frequency radiation slot 302 and the low-frequency radiation slot 304 are orthogonally distributed, the high-frequency antenna and the low-frequency antenna are also orthogonal in polarization.

[0078] In an optional embodiment, the all-metal dual-band, dual-polarization, dual-suppression common aperture antenna has an overall square aperture, and the frequency ratio between the low-frequency antenna and the high-frequency antenna is 1:2. Furthermore, the slot unit spacing of the low-frequency radiation slots 304 in two mutually perpendicular arrangement directions is equal, and the slot unit spacing of the high-frequency radiation slots 302 in two mutually perpendicular arrangement directions is also equal. That is, the slot unit spacing of the low-frequency antenna in two mutually perpendicular arrangement directions is equal, and the slot unit spacing of the high-frequency antenna in two mutually perpendicular arrangement directions is also equal.

[0079] To satisfy the above square aperture and frequency ratio, the following equation must be true:

[0080]

[0081] In the above formula, a represents the length of the side parallel to 302, the high-frequency radiation slot, and b represents the length of the side parallel to 304, the low-frequency radiation slot. 高频 Represents the wavelength of the corresponding high frequency in free space.

[0082] If the parameters of the low-frequency antenna are used to calculate the antenna aperture size, the following relationship is used:

[0083]

[0084] In the above formula, a represents the length of the side parallel to 302, the high-frequency radiation slot, and b represents the length of the side parallel to 304, the low-frequency radiation slot. 低频 Represents the wavelength of the corresponding high frequency in free space.

[0085] For the antenna provided in the embodiment of the present invention, the frequency ratio of the low-frequency antenna to the high-frequency antenna is 1:2, so the free-space wavelengths corresponding to the high and low frequencies satisfy the following relationship:

[0086] λ 低频 =2*λ 高频 (3)

[0087] Since equation (3) holds, equations (1) and (2) are actually equivalent.

[0088] In an optional embodiment, the low-frequency radiation slot 304 is a 2×2 array, and the high-frequency radiation slot 302 is a 4×4 array, that is, the low-frequency antenna is a 2×2 slot array, and the high-frequency antenna is a 4×4 slot array. Of course, the antenna array scale here can be flexibly adjusted and is not limited to this setting.

[0089] Example 2:

[0090] The all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna provided in Example 1 can be used as an independent unit to further form antenna arrays of different scales.

[0091] like Figure 17 As shown, Example 2 provides an all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna array, including several all-metal dual-frequency dual-polarization dual-suppression common-aperture antennas as described in Example 1, and the antennas are arranged in a rectangular grid, and the rectangular grid array scale is 6×6.

[0092] In an optional embodiment, the large-scale antenna array can be processed in one piece using a milling process, rather than machining the individual units individually and then joining them together. This approach ensures machining accuracy and reduces machining costs.

[0093] It should be noted that, in Example 1 and Example 2 of the present invention, no specific size parameters are given, because they can be flexibly designed to correspond to different working frequency bands and index requirements, and no absolute restrictions are imposed here.

[0094] In summary, compared with the existing technology, the present invention has the following beneficial effects:

[0095] 1. The antenna of the present invention uses a simple multi-mode resonant cavity to replace the complex feeding network in the traditional common aperture antenna, which reduces the difficulty of antenna design and processing to a certain extent;

[0096] 2. The antenna of the present invention only comprises a single-layer cavity structure, and has a relatively low cross-sectional height;

[0097] 3. The orthogonal distribution of high and low frequency radiation slots in the present invention is conducive to polarization isolation between the two frequency band antennas;

[0098] 4. The antenna is made of all-metal material and has the advantages of high radiation efficiency and large power capacity;

[0099] 5. By embedding a simple periodic structure within the antenna, the antenna is endowed with anti-interference capabilities in two different frequency bands. Compared to the traditional method of cascading filters at the end of the antenna, the method described in this invention can effectively avoid cascade losses while also reducing the system size to a certain extent.

[0100] 6. The size of the slot array of the present invention can be flexibly adjusted and is not limited to the 2×2 and 4×4 slot array sizes described in Example 1;

[0101] 7. The antenna of the present invention has a flat structure, which is very convenient for array application;

[0102] 8. The antenna of the present invention is manufactured using a milling process, which is a mature process with high reliability, wide application range and low cost.

[0103] 9. Based on the milling process, the large-scale antenna array described in Example 2 can be processed in an integrated manner, rather than processing the units independently and then splicing them together. This approach can ensure processing accuracy and reduce processing costs.

[0104] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0105] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An all-metal dual-frequency dual-polarization dual-suppression common aperture antenna, characterized in that: An all-metal waveguide structure is adopted, and the antenna as a whole is a multi-mode resonant cavity, and the multi-mode resonant cavity includes a multi-mode resonant cavity bottom (1), an outer wall (2) and a top (3); At the bottom (1) of the multimode resonant cavity, a high-frequency coaxial shell (105-2) corresponding to the first backplate opening (105-3) and a low-frequency coaxial shell (106-2) corresponding to the second backplate opening (106-3) are respectively provided on the downward side of the metal backplate (101); the high-frequency coaxial inner core (105-1) sequentially passes through the high-frequency coaxial shell (105-2) and the first backplate opening (105-3) and extends into the space enclosed by the outer wall (2) of the multimode resonant cavity; the low-frequency coaxial inner core (106-1) sequentially passes through the low-frequency coaxial shell (106-2) and the second backplate opening (106-3) and extends into the space enclosed by the outer wall (2) of the multimode resonant cavity; At the top (3) of the multi-mode resonant cavity, a metal upper cover (301) is provided with regularly arranged high-frequency radiation slots (302) and low-frequency radiation slots (304), and the two are arranged orthogonally; a high-frequency metal tuning column (303) located on one side of each high-frequency radiation slot (302) and a low-frequency metal tuning column (305) located on one side of each low-frequency radiation slot (304) are provided on the downward side of the metal upper cover (301); On the upper side of the metal back plate (101), anti-interference structures that do not conflict with the coaxial feeding structure in space are periodically arranged, and each of the anti-interference structures includes an anti-interference metal column (102) and an anti-interference metal ring (104). The interference metal column (102) is nested in the middle of the anti-interference metal ring (104), and a gap (103) exists between the two.

2. The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna according to claim 1, characterized in that: The shapes of the anti-interference metal column (102) include a cylinder, a triangular prism or a quadrangular prism; the shapes of the anti-interference metal ring (104) include a circular ring, a triangular ring or a square ring.

3. The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna according to claim 1, characterized in that: The non-conflict with the coaxial feed structure in space specifically refers to: Partially cutting the anti-interference metal column (102) and the anti-interference metal ring (104) corresponding to the location of the high-frequency coaxial feeding structure; And / or removing the anti-interference metal column (102) corresponding to the location of the low-frequency coaxial feeding structure.

4. The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna according to claim 1, characterized in that: The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna has a square aperture as a whole, and the frequency ratio of the low-frequency antenna to the high-frequency antenna is 1:

2.

5. The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna according to claim 4, characterized in that: The low-frequency radiation slots (304) are in a 2×2 array, and the high-frequency radiation slots (302) are in a 4×4 array.

6. The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna according to claim 1, characterized in that: The slot unit spacings of the low-frequency radiation slot (304) in two mutually perpendicular arrangement directions are equal, and / or the slot unit spacings of the high-frequency radiation slot (302) in two mutually perpendicular arrangement directions are equal.

7. The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna according to any one of claims 1 to 6, characterized in that: After the metal back plate (101) is divided into sixteen equal parts, the first back plate opening (105-3) is opened in the middle area of ​​any one of the parts; after the metal back plate (101) is divided into four equal parts, the second back plate opening (106-3) is opened in the middle area of ​​any one of the parts; and / or air medium is used between any coaxial inner core and the corresponding coaxial outer shell; and / or the shape of any metal tuning column includes a quadrangular prism, a triangular prism or a cylinder; And / or in terms of positional relationship, any metal tuning column is adjacent to the corresponding radiation slot, or is separated from the corresponding radiation slot by an appropriate distance, wherein the appropriate distance means that the distance between the high-frequency metal tuning column (303) and the high-frequency radiation slot (302) does not exceed one-eighth of the side length of the multi-mode resonant cavity, and the distance between the low-frequency metal tuning column (305) and the low-frequency radiation slot (304) does not exceed one-quarter of the side length of the multi-mode resonant cavity; And / or the slot form selected for any radiation slot includes a straight slot, an elliptical slot or an H-shaped slot.

8. An all-metal dual-frequency dual-polarization dual-suppression common aperture antenna array, characterized in that: The invention comprises a plurality of all-metal dual-frequency dual-polarization dual-suppression common-aperture antennas as described in any one of claims 1 to 7, wherein the antennas are arranged in a rectangular grid.

9. The all-metal dual-frequency dual-polarization dual-suppression common aperture antenna array according to claim 8, characterized in that: The rectangular grid array has a scale of 6×6; And / or based on the milling process, the all-metal dual-frequency dual-polarization dual-suppression common-aperture antenna array is integrated and formed.

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