Metal radar antenna unit and antenna

Abstract

The invention discloses a metal radar antenna unit and an antenna, the metal radar antenna unit comprises a metal body and a feed assembly, the feed assembly is connected with the metal body, the metal body comprises a horn layer and a feed network layer, the horn layer comprises a plurality of horn holes, the feed network layer comprises a feed slot and a plurality of feed holes, the feed holes are communicated with the horn holes, and the feed network layer is connected with the feed slot. The feed holes and the horn holes are distributed correspondingly, and the feed slot is arranged in the metal body and is communicated with all the feed holes. The antenna comprises a metal body and a feed assembly. The feed assembly is connected with the metal body and is used for feeding the metal body, the feed network layer is designed through feed slots and feed holes, the feed holes are in one-to-one correspondence with the horn holes, and feed energy is conducted from the feed network layer to the horn layer through the hole channels, so that efficient electromagnetic wave radiation is realized. By directly communicating the feed hole with the horn hole, the complexity of an intermediate circuit is reduced, so that the feed loss is effectively reduced, and the overall efficiency and the performance stability of the antenna are improved.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a metal radar antenna unit and an antenna. Background Art

[0002] In modern radar technology, the antenna is one of the key components that determine radar performance. Metal radar antennas have become a widely used type of antenna due to their excellent conductivity, radiation efficiency, and structural strength. With the continuous increase in demand for radar systems, antenna design faces challenges in terms of high performance, high integration, and miniaturization. Although the traditional metal antenna structure has stable performance, it has some limitations in the design of the feeding system, which often leads to problems such as large feeding loss, uneven energy distribution, and unstable electromagnetic wave propagation path. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a metal radar antenna unit to solve the problems of large feeding loss, uneven energy distribution and unstable electromagnetic wave propagation path in the metal antenna.

[0004] In order to solve the above technical problems, a technical solution adopted in the present application is to provide a metal radar antenna unit, comprising: a metal body and a feeding assembly, wherein the feeding assembly is connected to the metal body and is used to feed the metal body; the metal body comprises a speaker layer and a feeding network layer, the speaker layer comprises a plurality of speaker holes, the speaker holes are opened along a first direction, and the speaker holes are distributed on the end surface of the metal body, the feeding network layer comprises a feeding slot and a plurality of feeding holes, the feeding slot and the feeding holes are opened in the metal body, the feeding holes are opened along the first direction, the feeding holes are connected with the speaker holes, the feeding holes are distributed correspondingly to the speaker holes, and the feeding slot is arranged in the metal body and connects all the feeding holes.

[0005] The beneficial effects of the present application are as follows: the present application includes a metal body and a feeding assembly. The feeding assembly is connected to the metal body and is used to feed the metal body, thereby realizing the normal operation of the antenna unit. The metal body includes a two-layer structure: a speaker layer and a feeding network layer. The speaker layer is opened along a first direction through a plurality of speaker holes, which are distributed on the end face of the metal body and are responsible for guiding and radiating electromagnetic waves. The feeding network layer is designed through feeding slots and feeding holes, and the feeding holes correspond to the speaker holes one by one. Through these holes, the feeding energy is conducted from the feeding network layer to the speaker layer, thereby realizing efficient electromagnetic wave radiation. The feeding slots and feeding holes can ensure uniform distribution of energy during the feeding process and avoid the problem of uneven feeding. By directly connecting the feeding hole with the speaker hole, the complexity of the intermediate circuit is reduced, thereby effectively reducing the feeding loss and improving the overall efficiency of the antenna and the stability of its performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1is a structural schematic diagram according to an embodiment of the present application;

[0007] Figure 2 is a schematic diagram of a top view structure according to an embodiment of the present application;

[0008] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure in the AA direction;

[0009] Figure 4 yes Figure 2 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0010] Figure 5 is a schematic structural diagram of a first metal body according to an embodiment of the present application;

[0011] Figure 6 is a schematic structural diagram of the lower side of the first metal body according to an embodiment of the present application;

[0012] Figure 7 is a schematic diagram of a top view of the structure of a first metal body according to an embodiment of the present application;

[0013] Figure 8 is a bottom view structural diagram of a first metal body according to an embodiment of the present application;

[0014] Fig. 9 is a schematic structural diagram of a second metal body according to an embodiment of the present application;

[0015] Fig.10 is a schematic diagram of a top view of the structure of a second metal body according to an embodiment of the present application;

[0016] Fig.11 is a bottom view structural diagram of a second metal body according to an embodiment of the present application;

[0017] Fig.12 is a schematic structural diagram of a feeding assembly according to an embodiment of the present application;

[0018] Fig.13 is a schematic structural diagram of a feeding assembly in another direction according to an embodiment of the present application;

[0019] Fig.14 is a schematic diagram of the standing wave ratio of a metal radar antenna unit according to an embodiment of the present application;

[0020] Fig.15 is a main polarization pattern of the XOZ plane according to an embodiment of the present application;

[0021] Fig.16 is a cross-polarization pattern of the XOZ plane according to an embodiment of the present application;

[0022] Fig.17It is the main polarization pattern of the YOZ plane according to an embodiment of the present application;

[0023] Fig.18 It is a YOZ plane cross-polarization pattern according to an embodiment of the present application;

[0024] Fig.19 is a schematic structural diagram of a metal radar antenna according to an embodiment of the present application;

[0025] Fig. 20 It is a schematic diagram of the isolation of a metal radar antenna according to an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of this application.

[0027] It should be noted that when an element is referred to as being "fixed on" or "set on" another component, it can be directly on the other component or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component.

[0028] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0030] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which this application can be implemented, so they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0031] For the description of this application, the non-limiting Figure 1 The marks "front", "rear", "up", "down", "left", and "right" shown in the figure are used to facilitate understanding of the embodiment and are not intended to limit the present application. Among them, the front-to-back direction represents the longitudinal direction (third direction), the left-to-right direction represents the transverse direction (second direction), and the up-down direction represents the vertical direction (first direction).

[0032] Figure 1-Figure 13 An embodiment of the metal radar antenna unit of the present application is shown, including a metal body 1 and a feeding assembly 2, the feeding assembly 2 is connected to the metal body 1, and is used to feed the metal body 1; the metal body 1 includes a speaker layer 111 and a feeding network layer 121, the speaker layer 111 includes a plurality of speaker holes 1111, the speaker holes 1111 are opened along a first direction, and the speaker holes 1111 are distributed on the end surface of the metal body 1, the feeding network layer 121 includes a feeding slot 1211 and a plurality of feeding holes 1212, the feeding slot 1211 and the feeding hole 1212 are opened in the metal body 1, the feeding hole 1212 is opened along the first direction, the feeding hole 1212 is connected with the speaker hole 1111, the feeding hole 1212 is distributed correspondingly to the speaker hole 1111, and the feeding slot 1211 is arranged in the metal body 1 and is connected with all the feeding holes 1212.

[0033] The present application includes a metal body 1 and a feeding assembly 2. The feeding assembly 2 is connected to the metal body 1, and is used to feed the metal body 1, thereby realizing the normal operation of the antenna unit. The metal body 1 includes a two-layer structure: a speaker layer 111 and a feeding network layer 121. The speaker layer 111 is opened along a first direction through a plurality of speaker holes 1111, which are distributed on the end face of the metal body 1 and are responsible for guiding and radiating electromagnetic waves. The feeding network layer 121 is designed through a feeding slot 1211 and a feeding hole 1212. The feeding hole 1212 corresponds one-to-one to the speaker hole 1111. Through these channels, the feeding energy is conducted from the feeding network layer 121 to the speaker layer 111, thereby realizing efficient electromagnetic wave radiation. The feeding slot 1211 and the feeding hole 1212 can ensure uniform distribution of energy during the feeding process and avoid the problem of uneven feeding. By directly connecting the feed hole 1212 with the speaker hole 1111, the complexity of the intermediate circuit is reduced, thereby effectively reducing the feed loss and improving the overall efficiency of the antenna and the stability of performance.

[0034] The design of the feed slot 1211 in the feed network layer 121 allows multiple antenna units to be closely arranged in a small space, which is conducive to the integrated and miniaturized design of the metal radar antenna unit, adapting to the current trend of increasingly stringent requirements on the volume, weight and power consumption of radar equipment. The metal radar antenna unit can achieve precise control of the electromagnetic wave propagation path by optimizing the design of the metal body 1, so that the directivity and gain of the antenna are significantly improved.

[0035] In some embodiments, Figure 1-Figure 4 As shown, the metal body 1 includes a first metal body 11 and a second metal body 12 , which are fixedly connected. A speaker layer 111 can be provided on the first metal body 11 , and a feed network layer 121 can be provided on the second metal body 12 .

[0036] In some embodiments, Figure 1-Figure 4 As shown, the metal body 1 includes a first metal body 11 and a second metal body 12, the first metal body 11 and the second metal body 12 are fixedly connected, the first metal body 11 includes a speaker layer 111 and a first feed layer 112, the speaker layer 111 is far away from the second metal body 12, the first feed layer 112 is adjacent to the second metal body 12, a plurality of first through holes 1121 are arranged on the first feed layer 112, the first through holes 1121 are arranged corresponding to the speaker holes 1111, a plurality of blind holes 1213 are arranged on the second metal body 12, the blind holes 1213 correspond to the first through holes 1121, and the first through holes 1121 and the blind holes 1213 constitute a feed hole 1212. A first connecting groove 113 is arranged on the first feed layer 112, a second connecting groove 1214 is arranged on the second metal body 12, and the first connecting groove 113 and the second connecting groove 1214 constitute a feed groove 1211. The first feeding layer 112 of the first metal body 11 and the second metal body 12 together form a feeding network layer 121. This can improve the processing accuracy of the feeding network layer 121. The metal radar antenna unit can achieve precise control of the electromagnetic wave propagation path by optimizing the design of the metal body 1, so that the directivity and gain of the antenna are significantly improved.

[0037] In some embodiments, the inner wall of the speaker hole 1111 is provided with a step, so that the speaker hole 1111 forms a double-layer stepped transition speaker hole 1111. The gain of a single speaker hole 1111 is about 8.5dBi. The metal body 1 adopts a double-layer stepped transition speaker hole 1111 and a feed network layer 121 solution. Considering that the waveguide gap is small and the waveguide groove is deep, in order to facilitate processing and reduce costs, the feed network layer 121 is split in half to form an upper and lower layer, which constitutes the feed network layer 121 and is locked and fixed from the back by screws.

[0038] The first metal body 11 and the second metal body 12 are provided with limiting steps (not shown in the figure) and positioning pins to avoid the problem of easy misalignment of the first metal body 11 and the second metal body 12 during installation and ensure installation accuracy.

[0039] In some embodiments, Figure 8 As shown, the first connection groove 113 has the same structure as the second connection groove 1214 , and the first connection groove 113 includes a first sub-groove 1131 , a second sub-groove 1132 , a third sub-groove 1133 and a branch sub-groove 1134 . The first sub-slot 1131 is arranged along the second direction, one end of the first sub-slot 1131 is connected to the feeding assembly 2, and the other end is located in the middle of the first feeding layer 112 and connected to the middle of the second sub-slot 1132; the second sub-slot 1132 is arranged along the third direction and is located in the middle of the first feeding layer 112, both ends of the second sub-slot 1132 are located at the edges of the first feeding layer 112, and are respectively connected to the middle of the third sub-slot 1133 on both sides; the third sub-slot 1133 is arranged along the second direction, the third sub-slot 1133 is located at the two side edges of the first feeding layer 112, and both ends of the third sub-slot 1133 are connected to a pair of branch sub-slots 1134, the branch sub-slot 1134 is arranged along the third direction, the branch sub-slot 1134 extends toward the inner side of the first feeding layer 112, and the branch sub-slot 1134 is connected to the first through hole 1121. The branch sub-groove 1134 includes a main branch 1135, a first branch 1136 and a second branch 1137. One end of the main branch 1135 is connected to one end of the third sub-groove 1133, and the other end is connected to the first branch 1136 and the second branch 1137. The first branch 1136 and the second branch 1137 are each provided in a pair. The first branch 1136 is connected to the first through hole 1121 on the inner side, and the second branch 1137 is connected to the first through hole 1121 on the outer side.

[0040] In some embodiments, the width of the first branch 1136 is greater than the width of the second branch 1137 , the second branch 1137 is bent, and the length of the second branch 1137 is greater than the length of the first branch 1136 .

[0041] The size of the speaker hole 1111 is larger than that of the first through hole 1121. The shape and size of the blind hole 1213 are the same as those of the first through hole 1121.

[0042] The feeding network layer 121 is composed of the above-mentioned feeding hole 1212 and feeding slot 1211. The feeding network layer 121 is a full parallel feeding network, which is used to improve the standing wave ratio and the stability of the directional pattern bandwidth. The feeding network layer 121 needs to form Chebyshev amplitude and phase distribution in the second direction and the third direction respectively, wherein the amplitude distribution is used to control the beam width and overall sidelobe requirements of the two surfaces, and the phase distribution is to achieve different sidelobe requirements of 15dBc for half surface and 17dBc for the other half surface. The amplitude distribution is achieved by unequal power division of the waveguide T-section, and the phase distribution is achieved by waveguides of different lengths.

[0043] The feeding slot 1211 and the feeding hole 1212 can ensure uniform energy distribution during the feeding process and avoid uneven feeding problems. By directly connecting the feeding hole 1212 with the horn hole 1111, the complexity of the intermediate circuit is reduced, thereby effectively reducing the feeding loss and improving the overall efficiency of the antenna and the stability of performance.

[0044] In some embodiments, Fig.12 and Fig.13 As shown, the side of the metal body 1 is provided with a power amplifier output port 13, and the power amplifier output port 13 corresponds to the feeding assembly 2. The feeding assembly 2 includes a first connecting member 21, a second connecting member 22 and a third connecting member 23, the first connecting member 21 is connected to the first metal body 11 and the second metal body 12, the upper end faces of the second connecting member 22 and the third connecting member 23 are connected to the lower end face of the first connecting member 21, and the inner side face of the second connecting member 22 is connected to the inner side face of the third connecting member 23. A first threading hole 211 is provided on the second connecting member 22, and a second threading hole 24 is provided at the enclosure between the first connecting member 21, the second connecting member 22 and the third connecting member 23, and the second threading hole 24 is arranged along the first direction. The feeder wire connected to the feeding assembly 2 passes through the first connecting hole and the second connecting hole and is connected to the metal body 1.

[0045] In some embodiments, the second connection hole transitions vertically downward to the metal body 1 and is installed in close contact with the power amplifier output port 13 of the metal body 1. A circular arc-shaped transition waveguide port 25 is provided on one side of the first connection member 21 adjacent to the metal body 1, and the transition waveguide port 25 is correspondingly connected to the power amplifier output port 13.

[0046] In some embodiments, the first connecting member 21 and the side of the metal body 1 corresponding to the first connecting member 21 are both provided with positioning holes 212. The positioning holes 212 are arranged along the second direction. The positioning holes 212 are used to penetrate positioning pins to position the first connecting member 21 and ensure the installation accuracy of the first connecting member 21.

[0047] On the first metal body 11 , the speaker holes 1111 are arranged in four rows and eight columns.

[0048] The metal body 1 has a size of 90 mm*60 mm*18 mm and is made of 6061 aluminum. It is divided into a first metal body 11 and a second metal body 12. The first metal body 11 and the second metal body 12 are locked by screws and positioning pins. The height of the first metal body 11 is 13 mm, and the height of the second metal body 12 is 5 mm.

[0049] In the first metal body 11, the height of the speaker layer 111 is 8 mm, the height of the first feed layer 112 is 5 mm, and the height of the second metal body 12 is 5 mm, that is, the height of the feed network layer 121 is 10 mm.

[0050] The present application includes a metal body and a feeding assembly. The feeding assembly is connected to the metal body and is used to feed the metal body, thereby realizing the normal operation of the antenna unit. The metal body includes a two-layer structure: a speaker layer and a feeding network layer. The speaker layer is opened along a first direction through a plurality of speaker holes, which are distributed on the end face of the metal body and are responsible for guiding and radiating electromagnetic waves. The feeding network layer is designed through feeding slots and feeding holes. The feeding holes correspond to the speaker holes one by one. Through these holes, the feeding energy is conducted from the feeding network layer to the speaker layer, thereby realizing efficient electromagnetic wave radiation. The feeding slots and feeding holes can ensure uniform distribution of energy during the feeding process and avoid the problem of uneven feeding. By directly connecting the feeding hole with the speaker hole, the complexity of the intermediate circuit is reduced, thereby effectively reducing the feeding loss and improving the overall efficiency of the antenna and the stability of its performance.

[0051] like Fig.14 As shown in Figure 1, the standing wave ratio of the metal radar antenna unit is less than 1.7. The main polarization pattern of the metal radar antenna unit XOZ plane is shown in Figure 1. Fig.15 As shown, Figure 15-18 The radiation patterns at 24 GHz, 24.1 GHz and 24.2 GHz are shown in Figure 1. The maximum radiation direction is θ = 0° (normal to the array), the maximum polarization gain is between 23.8 dBi and 24 dBi, and the beam width is about 8.2 degrees. The cross-polarization radiation pattern of the XOZ plane is shown in Figure 1. Fig.16 As shown, the polarization discrimination within the beam width is greater than 50dBc. XOZ half-plane The maximum sidelobe of θ∈(0°,90°) is 7.6dBi(16.2dBc); -XOZ half plane The maximum sidelobe of θ∈(-90°,0°) is 6.2dBi(17.5dBc).

[0052] The main polarization pattern of the YOZ plane of the metal radar antenna unit is as follows: Fig.17 As shown in the figure, the maximum radiation direction is θ = 0° (normal to the array), the maximum polarization gain is between 23.8dBi and 24dBi, and the beam width is about 15.4 degrees. The YOZ plane cross-polarization pattern is shown in the figure Fig.18 As shown, the polarization discrimination rate within the beam width is greater than 50dBc. The maximum sidelobe of θ∈(0°,90°) is 7.8dBi(16.0dBc); -YOZ half plane The maximum sidelobe of θ∈(-90°,0°) is 5.8dBi(18.0dBc).

[0053] like Fig.19As shown, the present application also provides a metal radar antenna 20, which includes the above-mentioned three metal radar antenna units 10, two of which are used for receiving signals, and one of which is used for sending signals.

[0054] The distance between metal radar antennas is 160mm and 220mm. The isolation of metal radar antennas is as follows: Fig. 20 As shown, greater than 71dB (spacing 220mm); greater than 61dB (spacing 160mm).

[0055] The design results of the metal radar antenna are shown in Table 1.

[0056] Table 1 Design results of metal radar antenna

[0057]

[0058]

[0059] It can be seen that the present application discloses a metal radar antenna unit, including a metal body and a feeding assembly. The feeding assembly is connected to the metal body and is used to feed the metal body, thereby realizing the normal operation of the antenna unit. The metal body includes a two-layer structure: a speaker layer and a feeding network layer. The speaker layer is opened along a first direction through a plurality of speaker holes, distributed on the end face of the metal body, and is responsible for guiding and radiating electromagnetic waves. The feeding network layer is designed through feeding slots and feeding holes, and the feeding holes correspond to the speaker holes one by one. Through these holes, the feeding energy is conducted from the feeding network layer to the speaker layer, thereby realizing efficient electromagnetic wave radiation. The feeding slots and feeding holes can ensure uniform distribution of energy during the feeding process and avoid the problem of uneven feeding. By directly connecting the feeding hole with the speaker hole, the complexity of the intermediate circuit is reduced, thereby effectively reducing the feeding loss and improving the overall efficiency of the antenna and the stability of performance.

[0060] The above are merely embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structural transformations made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A metal radar antenna unit, characterized in that: It comprises a metal body and a feeding assembly, wherein the feeding assembly is connected to the metal body and is used to feed the metal body; the metal body comprises a speaker layer and a feeding network layer, the speaker layer comprises a plurality of speaker holes, the speaker holes are opened along a first direction, and the speaker holes are distributed on an end surface of the metal body; the feeding network layer comprises a feeding slot and a plurality of feeding holes, the feeding slot and the feeding holes are opened in the metal body, the feeding holes are opened along the first direction, the feeding holes are connected with the speaker holes, the feeding holes are distributed correspondingly to the speaker holes, the feeding slot is arranged in the metal body, and is connected with all the feeding holes.

2. The metal radar antenna unit according to claim 1, characterized in that: The metal body includes a first metal body and a second metal body, the first metal body and the second metal body are fixedly connected, the first metal body includes a speaker layer and a first feeding layer, the first feeding layer is adjacent to the second metal body, a plurality of first through holes are arranged on the first feeding layer, the first through holes are arranged corresponding to the speaker holes, a plurality of blind holes are arranged on the second metal body, the blind holes correspond to the first through holes, and the first through holes and the blind holes constitute the feeding hole; A first connecting groove is arranged on the first feeding layer, and a second connecting groove is arranged on the second metal body, and the first connecting groove and the second connecting groove constitute the feeding groove.

3. The metal radar antenna unit according to claim 2, characterized in that: The first connecting slot includes a first sub-slot, a second sub-slot, a third sub-slot and a branch sub-slot. The first sub-slot is arranged along the second direction, one end of the first sub-slot is connected to the feeding assembly, and the other end is located in the middle of the first feeding layer and connected to the middle of the second sub-slot; the second sub-slot is arranged along the third direction and is located in the middle of the first feeding layer, the two ends of the second sub-slot are located at the edges of the first feeding layer, and are respectively connected to the middle of the third sub-slots on both sides; the third sub-slot is arranged along the second direction, the third sub-slot is located at the two side edges of the first feeding layer, the two ends of the third sub-slot are connected to a pair of the branch sub-slots, the branch sub-slot is arranged along the third direction, the branch sub-slot extends toward the inner side of the first feeding layer, and the branch sub-slot is connected to the first through hole.

4. The metal radar antenna unit according to claim 3, characterized in that: The branch sub-groove includes a main branch, a first branch and a second branch, one end of the main branch is connected to one end of the third sub-groove, and the other end is connected to the first branch and the second branch, and the first branch and the second branch are each provided in a pair, the first branch is connected to the first through hole on the inner side, and the second branch is connected to the first through hole on the outer side.

5. The metal radar antenna unit according to claim 4, characterized in that: The width of the first branch is greater than that of the second branch, the second branch is bent, and the length of the second branch is greater than that of the first branch.

6. The metal radar antenna unit according to claim 1, characterized in that: The feeding network layer is a full parallel feed network, and the feeding network layer forms Chebyshev amplitude distribution and phase distribution in the second direction and the third direction respectively, wherein the Chebyshev amplitude distribution is used to control the beam width and overall side lobes of the two surfaces, and the phase distribution is used to control different side lobes.

7. The metal radar antenna unit according to claim 2, characterized in that: The feeding assembly includes a first connecting piece, a second connecting piece and a third connecting piece, the first connecting piece is connected to the first metal body and the second metal body, the upper end surfaces of the second connecting piece and the third connecting piece are connected to the lower end surface of the first connecting piece, the inner side surface of the second connecting piece is connected to the inner side surface of the third connecting piece, the second connecting piece is provided with a first threading hole, the enclosure between the first connecting piece, the second connecting piece and the third connecting piece is provided with a second threading hole, the second threading hole is arranged along the first direction, and the feeding line connected to the feeding assembly passes through the first connecting hole and the second connecting hole to be connected to the metal body.

8. The metal radar antenna unit according to claim 1, characterized in that: The inner wall of the horn hole is provided with steps, so that the horn hole forms a double-layer stepped transition horn hole.

9. The metal radar antenna unit according to claim 7, characterized in that: A power amplifier output port is provided on the side of the metal body, and the power amplifier output port corresponds to the feeding assembly; the second connecting hole transitions vertically downward to the metal body and is installed in close contact with the power amplifier output port, and an arc-shaped transition waveguide port is provided on one side of the first connecting member adjacent to the metal body, and the transition waveguide port is correspondingly connected to the power amplifier output port.

10. A metal radar antenna, characterized in that: The metal radar antenna unit comprises the metal radar antenna unit according to any one of claims 1 to 9, wherein the metal radar antenna comprises at least three of the metal radar antenna units, two of which are used for receiving signals, and one of which is used for sending signals.

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