Horn antenna

Abstract

The embodiment of the invention provides a horn antenna, and relates to the field of antennas. The horn antenna comprises an antenna body, the antenna body is in a horn shape, the inner side radius and the axial position of the antenna body meet the function relation of index gradual change, and a plurality of annular tables are arranged on the outer periphery of the antenna body at intervals in the axial direction of the antenna body. The horn antenna provided by the invention has the excellent radiation performance of beam equalization, low side lobe, low cross polarization and the like of a traditional inner corrugated horn antenna, but is easier to process and implement at low cost, and can also avoid the problem of breakdown between inner corrugated walls of the traditional corrugated horn antenna during high-power microwave radiation, thereby improving the electromagnetic wave radiation capability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antenna, in particular to a horn antenna. BACKGROUND

[0002] The horn antenna has various forms such as sector horn antenna, corner-pyramid horn antenna, conical horn antenna, etc., and is commonly used as signal transmitting and receiving antenna, standard gain antenna, reflector antenna feed, etc., and is widely applied in the fields of communication, radar, testing, etc.

[0003] In order to realize beam equalization, low side lobe and low cross polarization, etc., the prior art sets corrugated grooves on the inner wall of the conical horn antenna to form an inner corrugated horn antenna.

[0004] However, the corrugated grooves of the prior art inner corrugated horn antenna are on the inner side of the horn antenna, which is difficult to process and has high cost. Most importantly, when used for high-power microwave radiation, breakdown phenomenon will occur between the metal walls on both sides of the corrugated grooves, which deteriorates the antenna radiation performance. SUMMARY

[0005] The purpose of the present application includes providing a horn antenna which has the excellent radiation performance of beam equalization, low side lobe and low cross polarization of the traditional inner corrugated horn antenna, is easier to realize by low-cost processing method, and can avoid the breakdown problem between the inner corrugated walls of the traditional corrugated horn antenna when high-power microwave radiation is used, thereby improving the electromagnetic wave radiation capability.

[0006] Embodiments of the present application can be implemented as follows: The present application provides a horn antenna, comprising an antenna body, the antenna body is in the shape of a horn, and the inner side radius of the antenna body and the axial position satisfy an exponential gradient function relationship, and a plurality of ring platforms are arranged on the outer periphery of the antenna body along the axial direction of the antenna body.

[0007] In an optional embodiment, one end of the antenna body opposite to the other end is a feed end, and the other end is an aperture end, and in a coordinate system with the intersection of the axis of the antenna body and the end face of the feed end as the origin, the axis of the antenna body as the Z axis, and the radius of the antenna body as the X axis, the inner side radius X of the antenna body and the axial position Z satisfy the following exponential gradient function relationship:

[0008]

[0009]

[0010] Wherein, a and c are both constants; e is a natural constant; r b is the inner radius of the feed end, r tis an inner radius of the aperture end; L is a length of the antenna body in the axial direction.

[0011] In an optional embodiment, a is in a range of 2mm-8mm; and / or, The length of the antenna body is in a range of 270mm-330mm; and / or, The inner radius r t of the aperture end is in a range of 130mm-170mm; and / or; The inner radius r b of the feed end corresponds to a dimension of one end of a circular waveguide of a waveguide transition connector for feeding.

[0012] In an optional embodiment, an end surface of the ring platform close to the aperture end is aligned with an end surface of the aperture end.

[0013] In an optional embodiment, all the ring platforms are arranged equidistantly in the axial direction of the antenna body, and the interval is in a range of 12mm-17mm.

[0014] In an optional embodiment, the outer convex heights of all the ring platforms in the radial direction of the antenna body are the same, and the range is 20mm-30mm.

[0015] In an optional embodiment, the thicknesses of all the ring platforms in the axial direction of the antenna body are the same.

[0016] In an optional embodiment, the wall thickness of the antenna body is the same, and the range is 2mm-3mm.

[0017] In an optional embodiment, a is 5mm; r b is 48.935mm, r t is 150mm, L is 300mm, the wall thickness of the antenna body is 2.5mm, the thickness of the ring platform is 2.5mm, the outer convex height of all the ring platforms in the radial direction of the antenna body is 25mm, and the interval of any two adjacent ring platforms in the axial direction of the antenna body is 14.5mm.

[0018] In an optional embodiment, the horn antenna further comprises a connecting flange arranged on one side of the antenna body at the feed end, and the connecting flange is used for connecting a waveguide transition connector.

[0019] The horn antenna provided by the embodiment of the present application has the following beneficial effects: The application sets the antenna body as a horn shape, and makes the inside radius of the antenna body and the axial position satisfy the exponential gradient function relationship, and a plurality of ring platforms are arranged on the outer periphery of the antenna body along the axial direction of the antenna body, so that the wave trough is formed between the adjacent two ring platforms, and the wave peak is formed at the position of the corresponding ring platform, so that the antenna body forms the outer corrugated horn antenna, which can obtain the superior radiation performance of the conventional corrugated conical horn antenna, and since the ring platform is arranged on the outer periphery, it can be integrally formed by milling, and does not need complex processing tools, and the processing difficulty is low and the cost is low. Most importantly, the horn antenna provided by the application can also improve the problem of breakdown between corrugated metal walls under high-power microwave radiation. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 The structural schematic diagram of the horn antenna provided by the present embodiment under the first view angle; Figure 2 The structural schematic diagram of the horn antenna provided by the present embodiment under the second view angle; Figure 3 The structural schematic diagram of the horn antenna provided by the present embodiment under the third view angle; Figure 4 The structural schematic diagram of the horn antenna provided by the present embodiment on the x-o-z plane; Figure 5 The structural schematic diagram of the horn antenna provided by the present embodiment on the y-o-z plane; Figure 6 The radiation pattern of the horn antenna provided by the present embodiment at 2.1GHz; Figure 7 The radiation pattern of the horn antenna provided by the present embodiment at 2.45GHz; Figure 8 The radiation pattern of the horn antenna provided by the present embodiment at 2.8GHz; Figure 9 The horn antenna provided by the present embodiment under the second view angle; Figure 10 The horn antenna provided by the present embodiment under the second view angle; Figure 11 The horn antenna provided by the present embodiment under the second view angle; Figure 12The simulation diagram of the electric field distribution of the horn antenna provided in the embodiment in an x-o-z orthogonal plane; Figure 13 The simulation diagram of the electric field distribution of the horn antenna provided in the embodiment in a y-o-z orthogonal plane; Figure 14 The radiation pattern of a traditional conical horn antenna at 2.45 GHz; Figure 15 The radiation pattern of a traditional exponential tapered conical horn antenna at 2.45 GHz; Figure 16 The sidelobe level diagram of the traditional conical horn antenna; Figure 17 The sidelobe level diagram of the traditional exponential tapered conical horn antenna; Figure 18 The front-to-back ratio diagram of the traditional conical horn antenna; Figure 19 The front-to-back ratio diagram of the traditional exponential tapered conical horn antenna; Figure 20 The main lobe cross-polarization level diagram of the traditional conical horn antenna; Figure 21 The main lobe cross-polarization level diagram of the traditional exponential tapered conical horn antenna; Figure 22 The simulation diagram of the electric field distribution of a traditional inner corrugated horn antenna in an x-o-z orthogonal plane; Figure 23 The simulation diagram of the electric field distribution of the traditional inner corrugated horn antenna in a y-o-z orthogonal plane.

[0022] Icon: 100-horn antenna; 110-antenna body; 111-feed end; 113-aperture end; 130-ring table; 150-connection flange. DETAILED DESCRIPTION

[0023] The corrugated groove of the existing conical corrugated horn antenna is on the inner side of the horn antenna, which is difficult to process and has high cost, and when used for high-power microwave radiation, breakdown phenomenon occurs between the metal walls on both sides of the corrugated groove, which deteriorates the antenna radiation performance.

[0024] In view of the above problems, the present application provides a horn antenna which has the excellent radiation performance of beam equalization, low sidelobe and low cross-polarization of the traditional inner corrugated horn antenna, is easier to process at low cost, can also avoid the breakdown problem between the inner corrugated walls of the traditional corrugated horn antenna when high-power microwave radiation is used, and thus improves the electromagnetic wave radiation capability.

[0025] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0027] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0029] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0031] The overall structure, working principle and technical effects of the horn antenna 100 provided by the present application will be described in detail below through embodiments and in combination with the drawings.

[0032] Please refer to Figure 1 , Figure 2 and Figure 3 , the present embodiment provides a kind of horn antenna 100, it can be applied to communication, radar and electromagnetic test etc.

[0033] Please refer to Figure 1 , Figure 2 and Figure 3In the embodiment, the horn antenna 100 comprises an antenna body 110, the antenna body 110 is in the shape of a horn, and the inner side radius of the antenna body 110 and the axial position satisfy an exponential gradient function relationship, and a plurality of ring platforms 130 are arranged on the outer periphery of the antenna body 110 along the axial direction of the antenna body 110.

[0034] In the embodiment, the antenna body 110 is arranged in the shape of a horn, and the inner side radius of the antenna body 110 and the axial position satisfy an exponential gradient function relationship, and a plurality of ring platforms 130 are arranged on the outer periphery of the antenna body 110 along the axial direction of the antenna body 110, so that a wave trough is formed between two adjacent ring platforms 130, and a wave peak is formed at the position corresponding to the ring platform 130, so that the antenna body 110 forms an outer corrugated horn antenna 100. The arrangement makes the horn antenna 100 obtain the superior radiation performance of the traditional inner corrugated horn antenna, and since the ring platforms 130 are arranged on the outer periphery, they can be integrally formed by milling and do not require complex processing tools, so the processing difficulty is low and the cost is low. Most importantly, the horn antenna provided by the embodiment can also improve the problem of breakdown between corrugated metal walls when high-power microwaves are radiated, compared with the traditional inner corrugated horn antenna.

[0035] Specifically, the improvement of the radiation performance is reflected in: Better impedance matching: The inner side radius of the antenna body 110 and the axial position satisfy an exponential gradient function relationship, which can make the feed port impedance smoothly match the horn aperture impedance in each section. Compared with the conical horn antenna, this exponential gradient structure can more effectively reduce the impedance discontinuity between the waveguide and the free space, thereby reducing the reflection of electromagnetic waves and enabling more energy to be radiated into the free space, thereby improving the radiation efficiency.

[0036] Wider bandwidth: The exponential gradient structure increases the resonance modes of the antenna, thereby expanding the bandwidth of the antenna. In contrast, the bandwidth of the conical horn antenna is relatively narrow. This wideband characteristic enables the antenna to work in a wider frequency range while maintaining good radiation performance.

[0037] Lower side lobe and cross polarization level: The plurality of ring platforms 130 arranged on the outer periphery of the antenna body 110 along the axial direction, similar to the structure of the corrugated horn antenna. These ring platforms 130 can achieve extremely low side lobe and cross polarization levels within the antenna bandwidth range, so that the radiation energy of the antenna is more concentrated in the main lobe direction, and the energy leakage in the side lobe direction is reduced, thereby improving the radiation performance and anti-interference ability of the antenna.

[0038] Better beam equalization characteristic: Under the joint action of the antenna body 110 and the plurality of ring platforms 130 arranged on the outer periphery along the axial direction, the radiation pattern has the same beam width in all planes in which it is located in the axial direction, and exhibits good beam equalization characteristics.

[0039] More uniform electric field distribution: The horn antenna 100 provided by the embodiment has an advantage in homogenizing the aperture field, and can reduce the electric field intensity of the antenna aperture and make the electric field distribution more uniform. When high-power microwave radiation occurs, the uniform distribution of the electric field intensity can reduce the case of excessively high local electric field intensity, thereby reducing the possibility of wall breakdown.

[0040] Improved power capacity: The larger aperture radius-to-wavelength ratio helps to withstand higher microwave power without breakdown, thereby improving the wall breakdown problem of the corrugated structure.

[0041] Please refer to Figures 1 to 5 In the embodiment, one end of the antenna body 110 opposite to the other end is the feed end 111, and the other end is the aperture end 113. In a coordinate system with the intersection of the axis of the antenna body 110 and the end face of the feed end 111 as the origin, the axis of the antenna body 110 as the Z axis, and the radius of the antenna body 110 as the X axis, the inner radius X of the antenna body 110 and the axial position Z satisfy the following exponential gradient function relationship:

[0042]

[0043]

[0044] wherein a and c are both constants; r b is the inner radius of the feed end 111, r t is the inner radius of the aperture end 113; and L is the length of the antenna body 110 in the axial direction.

[0045] Please refer to Figures 1 to 5 The profile of the antenna body 110 is optimized by the above-mentioned exponential gradient function, which can obtain better radiation performance, such as good impedance matching, wider blocking bandwidth, lower side lobe level, lower cross-polarization level, better beam equalization performance, etc.

[0046] Specifically, a and c are adjustable parameters, and both of them can adjust the bending degree of the exponential gradient line. The inner radius r b of the feed end 111 corresponds to the size of one end of the circular waveguide of the waveguide conversion connector used for feeding. The minimum value of the value range of c is r b minus the maximum value of a. The maximum value of the value range of c is r b minus the minimum value of a.

[0047] In the embodiment, the value range of a is 2mm-8mm.

[0048] The value range of a is set to 2mm-8mm in this embodiment, so that the bending degree of the profile of the antenna body 110 can be better adjusted, and thus the radiation performance of the antenna can be improved.

[0049] Please refer to Figures 1 to 5 In this embodiment, the axial length L of the antenna body 110 is 270mm-330mm. The inner radius r t of the aperture end 113 is 130mm-170mm. The wall thickness of the antenna body 110 is the same, and the wall thickness t1 is 2mm-3mm.

[0050] The radiation performance of the horn antenna 100 can be improved by setting the above values.

[0051] In this embodiment, the end surface of the ring platform 130 close to the aperture end 113 is aligned with the end surface of the aperture end 113. All the ring platforms 130 are arranged at equal intervals in the axial direction of the antenna body 110, and the interval d t is 12mm-17mm. The outer convex height l t of all the ring platforms 130 in the radial direction of the antenna body 110 is the same, and the outer convex height l t is 20mm-30mm. The thickness t1 of all the ring platforms 130 in the axial direction of the antenna body 110 is the same.

[0052] The radiation performance of the antenna can be improved by optimizing the above value range of the ring platform 130 in this embodiment.

[0053] Please refer to Figures 1 to 5 In this embodiment, the horn antenna 100 further comprises a connecting flange 150, which is arranged at the side of the antenna body 110 located at the feed end 111, and is used to connect a waveguide conversion connector.

[0054] The connecting flange 150 is integrally formed with the antenna body 110 in this embodiment, so that the manufacturing and assembly are more convenient.

[0055] Please refer to Figures 1 to 13 In a group of embodiments, a group of values are obtained by simulation optimization with 2.1GHz-2.8GHz as the target working frequency range: the value of a is 5mm; the value of r b is 48.935mm, the value of r t is 150mm, the value of L is 300mm, the wall thickness of the antenna body 110 is 2.5mm, the thickness of the ring platform 130 is 2.5mm, the outer convex height of all the ring platforms 130 in the radial direction of the antenna body 110 is 25mm, and the interval of any two adjacent ring platforms 130 in the axial direction of the antenna body 110 is 14.5mm.

[0056] The embodiment can obtain better working performance in the target frequency range through optimization of the above values.

[0057] Specifically, r b The value of r can be determined according to the size of the coaxial-circular waveguide converter used.

[0058] The horn antenna 100 provided by the embodiment can constitute a directly usable horn antenna 100 in combination with an existing coaxial-circular waveguide converter. According to the horn antenna 100 theory, as long as the mode of the converter (TE 11 ) meets the requirements of the embodiment, the matching between the two can meet the actual requirements. Taking a coaxial-circular waveguide converter of Handa Microwave as an example, the nominal working frequency range is 2.1-2.8 GHz.

[0059] Please refer to Figure 6 , Figure 7 and Figure 8 , Figure 6 , Figure 7 and Figure 8 , which are the radiation patterns of the horn antenna 100 provided by the embodiment at 2.1 GHz, 2.45 GHz and 2.8 GHz when Phi is 0°, 30°, 60°, 90°, 120° and 150°, respectively (the coordinate system used is the coordinate system in Figure 4 and Figure 5 ). It can be seen that the 3dB beam width of the radiation patterns in different Phi planes at the three frequency points is basically the same, which indicates that the antenna has good beam equalization characteristics and can better meet the requirements of the feed of the rotating parabolic antenna. Figure 9 and Figure 10 respectively give the sidelobe level diagram and the front-to-back ratio diagram of the horn antenna 100 provided by the embodiment. It can be seen that in the frequency range of 2.1-2.8 GHz, the maximum sidelobe level of the antenna is -27.40 dB, and the minimum front-to-back ratio is 29.83 dB, which reflects the overall good low-sidelobe characteristics of the antenna. Figure 11 The cross-polarization level diagram of the horn antenna 100 provided by the embodiment in the main radiation direction (z+ direction in Figure 4 and Figure 5 ) is given. It can be seen from Figure 11 that in the frequency range of 2.1-2.8 GHz, the maximum cross-polarization level is -40.28 dB, which reflects good cross-polarization characteristics. Figure 12 and Figure 13 respectively give the electric field distribution of the horn antenna 100 provided by the embodiment in the xoz plane and the yoz plane when the frequency is 2.45 GHz. It can be seen from Figure 12 and Figure 13It can be seen that the high amplitude electric field is concentrated inside the horn, and after directional radiation with low side lobe and low cross polarization, the electric field value of the outer corrugated area is small, and it is difficult to occur breakdown phenomenon. Therefore, high power electromagnetic waves can be radiated.

[0060] In a group of comparative examples, the radius rb of the feed end 111, the radius rt of the aperture end 113, the axial length L of the traditional conical horn antenna, the exponential tapered conical horn antenna and the inner corrugated horn antenna, and the axial position and size of the inner ring platform 130 of the inner corrugated horn antenna are set to be basically the same as those of the horn antenna of the present embodiment for simulation comparison, and the specific comparison results are as follows: Through Figure 7 , Figure 14 and Figure 15 comparison, it can be seen that the beam equalization characteristics of the traditional conical horn antenna are the worst, the beam equalization characteristics of the exponential tapered conical horn antenna are slightly better, and the beam equalization characteristics of the horn antenna 100 provided by the present embodiment are better.

[0061] Figure 16 and Figure 17 are the side lobe levels of the traditional conical horn antenna and the exponential tapered conical horn antenna respectively. Compared with the side lobe level of the horn antenna 100 provided by the present embodiment (as shown in Figure 9 ), it can be seen that the horn antenna 100 provided by the present embodiment has the lowest side lobe level characteristics.

[0062] Figure 18 and Figure 19 are the front-to-back ratio diagrams of the traditional conical horn antenna and the exponential tapered conical horn antenna respectively. Compared with the front-to-back ratio diagram of the horn antenna provided by the present embodiment (as shown in Figure 10 ), it can be seen that the horn antenna provided by the present embodiment has the highest front-to-back ratio.

[0063] Figure 20 and Figure 21 are the cross polarization level diagrams of the main radiation direction of the traditional conical horn antenna and the exponential tapered conical horn antenna respectively. Compared with the cross polarization level diagram of the horn antenna 100 provided by the present embodiment in the main radiation direction (as shown in Figure 11 ), it can be seen that the cross polarization level of the horn antenna 100 provided by the present embodiment is slightly higher at 2.1 GHz, but the cross polarization levels of the three are not much different at other frequencies.

[0064] Figure 22 and Figure 23 are the electric field distribution diagrams of the traditional inner corrugated horn antenna in the xoz plane and the yoz plane at 2.45 GHz respectively, and the electric field distribution diagrams of the horn antenna 100 provided by the present embodiment (as shown in Figure 12 and Figure 13By comparison, it can be seen that the xoz plane is the E plane of all the horn antennas 100, and the electric field in the plane will form a strong distribution on the horn wall. Figure 12 , Figure 22 The inner part of the horn antenna 100 of the embodiment is a smooth metal surface, while the inner part of the conventional inner corrugated horn antenna is a corrugated surface. Figure 22 It can be seen that the conventional inner corrugated horn antenna will form a cross-field between the metal walls on both sides of the corrugation, and is prone to breakdown when radiating high-power electromagnetic waves, affecting the radiation performance of the antenna.

[0065] In summary, the antenna body 110 is provided in a horn shape, and the inner radius and axial position of the antenna body 110 satisfy an exponential gradient function, and a plurality of ring platforms 130 are arranged on the outer periphery of the antenna body 110 along the axial direction of the antenna body 110, so that a wave valley is formed between two adjacent ring platforms 130, and a wave peak is formed at the position corresponding to the ring platform 130, so that the antenna body 110 forms an outer corrugated horn antenna 100, which can obtain the superior radiation performance of the conventional corrugated conical horn antenna 100, and since the ring platform 130 is arranged on the outer periphery, it can be milled and integrally formed, and does not require complex processing tools, and has low processing difficulty and low cost. Most importantly, the horn antenna 100 provided by the embodiment has the excellent radiation characteristics of the conventional inner corrugated horn antenna, and can improve the breakdown problem between the metal walls on both sides of the corrugation when radiating high-power electromagnetic waves.

[0066] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A horn antenna, characterized in that: The invention comprises an antenna body (110), wherein the antenna body (110) is horn-shaped, and the inner radius of the antenna body (110) and the axial position satisfy an exponentially gradual functional relationship, and the outer periphery of the antenna body (110) is provided with a plurality of ring platforms (130) at intervals along the axial direction of the antenna body (110).

2. The horn antenna according to claim 1, wherein: One of the two opposite ends of the antenna body (110) is a feed end (111), and the other is an aperture end (113). In a coordinate system with the intersection of the axis of the antenna body (110) and the end surface of the feed end (111) as the origin, the axis of the antenna body (110) as the Z axis, and the radius of the antenna body (110) as the X axis, the inner radius X and the axial position Z of the antenna body (110) satisfy the following exponentially gradient functional relationship: Among them, a and c are constants; e is a natural constant; r b is the inner radius of the feed end (111), r t is the inner radius of the aperture end (113); and L is the axial length of the antenna body (110).

3. The horn antenna according to claim 2, wherein: The value range of a is 2mm-8mm; and / or, The axial length of the antenna body (110) is 270 mm to 330 mm; and / or, The inner radius r of the aperture end (113) t The value range is 130mm-170mm; and / or; The inner radius r of the feed end (111) b The value corresponds to the size of one end of the circular waveguide of the waveguide conversion connector used for feeding.

4. The horn antenna according to claim 2, wherein: The end surface of the ring platform (130) close to the aperture end (113) is aligned with the end surface of the aperture end (113).

5. The horn antenna according to claim 2, wherein: All the ring stages (130) are arranged at equal intervals in the axial direction of the antenna body (110), and the interval value range is 12 mm-17 mm.

6. The horn antenna according to claim 2, characterized in that All the ring platforms (130) have the same radial outward protrusion height in the antenna body (110), and the value range is 20 mm to 30 mm.

7. The horn antenna according to claim 2, characterized in that: All the ring platforms (130) have the same thickness in the axial direction of the antenna body (110), with a value ranging from 2 mm to 3 mm.

8. The horn antenna according to claim 2, wherein: The wall thickness of the antenna body (110) is the same, and the value range is 2mm-3mm.

9. The horn antenna according to claim 2, wherein: The value of a is 5 mm; the value of rb is 48.935 mm, the value of rt is 150 mm, the value of L is 300 mm, the wall thickness of the antenna body (110) is 2.5 mm, the thickness of the ring platform (130) is 2.5 mm, the radial convex height of all the ring platforms (130) in the antenna body (110) is 25 mm, and the axial spacing between any two adjacent ring platforms (130) in the antenna body (110) is 14.5 mm.

10. The horn antenna according to claim 2, wherein: The horn antenna further comprises a connecting flange (150), the connecting flange (150) being arranged on one side of the antenna body (110) located at the feed end (111), and the connecting flange (150) being used for connecting a waveguide conversion connector.

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