C-band horn antenna

Abstract

The invention discloses a C-band horn antenna, which comprises a supporting seat and an antenna array, and is characterized in that the antenna array is arranged on the supporting seat, the antenna array comprises a first array unit, a second array unit and a third array unit which are the same in structure, and the first array unit, the second array unit and the third array unit are sequentially arranged in the vertical direction; the first array unit comprises a first horn channel, a second horn channel and a third horn channel which are sequentially arranged in the transverse direction, and the second array unit comprises a fourth horn channel, a fifth horn channel and a sixth horn channel which are sequentially arranged in the transverse direction. The third array unit comprises a seventh horn channel, an eighth horn channel and a ninth horn channel which are sequentially arranged in the transverse direction. According to the antenna array, the fifth horn channel is located in the center of the antenna array, only the fifth horn channel is fed, the other horn channels are virtual elements, feeding is not carried out, the lobe width changes more stably along with the frequency, and the antenna array gain is high.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a C-band horn antenna. Background Art

[0002] An antenna is a converter that converts the guided waves propagating on the transmission line into electromagnetic waves propagating in an unbounded medium, or vice versa. By placing the antenna on the ground, the antenna generates and emits electromagnetic energy, achieving interference signal coverage of a certain energy in a specified airspace, thereby interfering with the target.

[0003] An antenna array is a group of antennas consisting of two or more antennas. Traditional antenna arrays rely solely on beam broadening to cover the required area, and do not reasonably distribute the feeding conditions of each antenna unit. Within the frequency range, the lobe width changes dramatically with frequency, and the gain of the antenna array is low. Summary of the invention

[0004] The main technical problem solved by the present application is to provide a C-band horn antenna to solve the problem that the lobe width varies drastically with frequency and the gain of the antenna array is low.

[0005] To solve the above technical problems, a technical solution adopted in the present application is to provide a C-band horn antenna, including a support base and an antenna array, the antenna array being arranged on the support base, the antenna array including a first array unit, a second array unit and a third array unit with the same structure, the first array unit, the second array unit and the third array unit being arranged in sequence along the vertical direction; the first array unit including a first horn channel, a second horn channel and a third horn channel being arranged in sequence along the transverse direction, the second array unit including a fourth horn channel, a fifth horn channel and a sixth horn channel being arranged in sequence along the transverse direction, the third array unit including a seventh horn channel, an eighth horn channel and a ninth horn channel being arranged in sequence along the transverse direction; the fifth horn channel is located at the center of the antenna array, and only the fifth horn channel is fed.

[0006] In some embodiments, the length of the antenna array is 170 mm-180 mm, the width of the antenna array is 150 mm-160 mm, and the height of the antenna array is 185 mm-195 mm.

[0007] In some embodiments, the first horn channel includes a first channel portion and a second channel portion, the first channel portion is horn-shaped, the front end of the first channel portion has a first waveguide opening, the first waveguide opening is rectangular, the opening area of ​​the first channel portion gradually decreases from front to back, the second channel portion is connected to the rear end of the first channel portion, the rear end of the second channel portion has a second waveguide opening, the second waveguide opening is rectangular, and the opening area of ​​the second channel portion remains unchanged.

[0008] In some embodiments, the length of the first waveguide opening is 50 mm-55 mm, the height of the first waveguide opening is 40 mm-45 mm, the length of the second waveguide opening is 20 mm-25 mm, and the height of the second waveguide opening is 40 mm-45 mm.

[0009] In some embodiments, the antenna array is an integrated structure or is formed by splicing multiple structures.

[0010] In some embodiments, the first array unit includes a first array mounting frame and a second array mounting frame. The first array mounting frame and the second array mounting frame have the same structure and are mirror-symmetrically arranged along the vertical direction. The first array mounting frame and the second array mounting frame are detachably connected.

[0011] In some embodiments, the front sides of the first array mounting frame and the second array mounting frame are each provided with three array slots spaced apart in the lateral direction, and the array slots are U-shaped; the three array slots of the first array mounting frame are connected in sequence with the three array slots of the second array mounting frame to respectively enclose a first speaker channel, a second speaker channel, and a third speaker channel.

[0012] In some embodiments, the back side of the first array mounting frame is provided with a first matching groove, a second matching groove, a third matching groove and a fourth matching groove in sequence along the transverse direction, the first matching groove and the fourth matching groove have the same structure and are symmetrically distributed at both ends of the first array mounting frame, the second matching groove and the third matching groove have the same structure, and the second matching groove and the third matching groove are spaced apart and distributed between the first matching groove and the second matching groove; the three array grooves of the first array mounting frame are correspondingly formed with three array protrusions on the back side of the first array mounting frame, and the three array protrusions are distributed in sequence along the transverse direction between the first matching groove and the second matching groove, between the second matching groove and the third matching groove, and between the third matching groove and the fourth matching groove.

[0013] In some embodiments, the cross-sectional shape of the first matching groove is a trapezoid; and the cross-sectional shape of the second matching groove is a hexagon.

[0014] In some embodiments, the antenna array is mounted on a support base at an elevation angle of 40°-50°.

[0015] The beneficial effects of the present application are as follows: the present application discloses a C-band horn antenna, comprising a support base and an antenna array, the antenna array being arranged on the support base, the antenna array comprising a first array unit, a second array unit and a third array unit of the same structure, the first array unit, the second array unit and the third array unit being arranged in sequence along the vertical direction; the first array unit comprising a first horn channel, a second horn channel and a third horn channel being arranged in sequence along the transverse direction, the second array unit comprising a fourth horn channel, a fifth horn channel and a sixth horn channel being arranged in sequence along the transverse direction, the third array unit comprising a seventh horn channel, an eighth horn channel and a ninth horn channel being arranged in sequence along the transverse direction. In the present application, the feeding conditions of each horn channel are reasonably allocated, the fifth horn channel is located at the center of the antenna array, only the fifth horn channel is fed, the remaining horn channels are virtual elements and are not fed, the lobe width changes more smoothly with frequency, and the antenna array gain is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an embodiment of the present application;

[0017] Figure 2 is a schematic structural diagram of an antenna array according to an embodiment of the present application;

[0018] Figure 3 is a front view structural diagram of an antenna array according to an embodiment of the present application;

[0019] Figure 4 is a schematic diagram of the front view of the back of the antenna array according to an embodiment of the present application;

[0020] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure in the AA direction;

[0021] Figure 6 is a schematic structural diagram of a first array mounting frame according to an embodiment of the present application;

[0022] Figure 7 is a structural schematic diagram of the first array mounting frame of an embodiment of the present application from another perspective;

[0023] Figure 8 This is a schematic diagram of the structure of a support base according to an embodiment of the present application;

[0024] Fig. 9 is a schematic diagram of a basic model and a coordinate system of an embodiment of the present application;

[0025] Fig.10 is an EIRP requirement curve of an embodiment of the present application;

[0026] Fig.11 is a VSWR schematic diagram of an embodiment of the present application;

[0027] Fig.12 is a three-dimensional directional diagram of an embodiment of the present application;

[0028] Fig.13 is another three-dimensional directional diagram of an embodiment of the present application;

[0029] Fig.14 is a pitch plane directional diagram of an embodiment of the present application;

[0030] Fig.15 It is an azimuth plane direction diagram of an embodiment of the present application. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] For the description of this application, 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, the left-to-right direction represents the transverse direction, and the up-down direction represents the vertical direction.

[0037] Figure 1-Figure 8 The C-band horn antenna of the present application is shown, including a support base 1 and an antenna array 2, the antenna array 2 is arranged on the support base 1, the antenna array 2 includes a first array unit 21, a second array unit 22 and a third array unit 23 with the same structure, the first array unit 21, the second array unit 22 and the third array unit 23 are arranged in sequence along the vertical direction; the first array unit 21 includes a first horn channel 211, a second horn channel 212 and a third horn channel 213 arranged in sequence along the transverse direction, the second array unit 22 includes a fourth horn channel 221, a fifth horn channel 222 and a sixth horn channel 223 arranged in sequence along the transverse direction, the third array unit 23 includes a seventh horn channel 231, an eighth horn channel 232 and a ninth horn channel 233 arranged in sequence along the transverse direction; the fifth horn channel 222 is located at the center of the antenna array 2, and only the fifth horn channel 222 is fed.

[0038] In the present application, the feeding conditions of each speaker channel are reasonably distributed, the fifth speaker channel 222 is located at the center of the antenna array 2, only the fifth speaker channel 222 is fed, and the remaining speaker channels are virtual elements and are not fed, the lobe width changes more smoothly with frequency, and the gain of the antenna array 2 is high. In the C-band 5.25GHz-5.75GHz range, the VSWR of the horn antenna is less than 1.2, and the antenna gain is above 10dBi.

[0039] In some embodiments, Figure 1 As shown, the antenna array 2 is mounted on the support base 1 at an elevation angle of 40°-50°, such as 40°, 45° or 50°, etc. In this embodiment, the elevation angle is 45° to ensure the best signal quality and coverage range.

[0040] In some embodiments, in combination Figure 1 and Figure 8As shown, the support base 1 includes a support plate 11 and a support frame 12. The two support frames 12 are vertically arranged at the left and right ends of the support plate 11 respectively. The front end of the support frame 12 has a connecting rod 121. The angle between the connecting rod 121 and the support plate 11 is 45°. The connecting rods 121 of the two support frames 12 are connected to the antenna array 2.

[0041] In some embodiments, the length of the antenna array 2 is 170 mm-180 mm, for example, 170 mm, 173 mm, 177 mm, or 180 mm. The width of the antenna array 2 is 150 mm-160 mm, for example, 150 mm, 153 mm, 155 mm, or 160 mm. The height of the antenna array 2 is 185 mm-195 mm, for example, 185 mm, 190 mm, 192 mm, or 195 mm. Specifically, the size of the antenna array 2 is 178 mm (length) × 153 mm (width) × 190 mm (height).

[0042] It should be noted that the structures of the first array unit 21, the second array unit 22 and the third array unit 23 are the same, and the structures of the first speaker channel 211 to the ninth speaker channel 233 are also the same. The following only takes the first array unit 21 and the first speaker channel 211 as an example for description.

[0043] In some embodiments, in combination Figure 2-Figure 5 As shown, specifically, in Figure 5 In the embodiment, the first speaker channel 211 includes a first channel portion 2111 and a second channel portion 2112; Figure 2 and Figure 3 The first channel portion 2111 is horn-shaped, and the front end of the first channel portion 2111 has a first waveguide opening 2113, the first waveguide opening 2113 is rectangular, and the opening area of ​​the first channel portion 2111 gradually decreases from front to back; Figure 4 and Figure 5 As shown, the second channel portion 2112 is connected to the rear end of the first channel portion 2111. The rear end of the second channel portion 2112 has a second waveguide opening 2114. The second waveguide opening 2114 is rectangular. The opening area of ​​the second channel portion 2112 remains unchanged. By shaping each speaker channel, the overall gain and efficiency of the antenna array 2 are improved.

[0044] In some embodiments, the length of the first waveguide opening 2113 is 50 mm-55 mm, such as 50 mm, 52 mm or 55 mm. The height of the first waveguide opening 2113 is 40 mm-45 mm, and the length of the second waveguide opening 2114 is 20 mm-25 mm, such as 20 mm, 22 mm or 25 mm. The height of the second waveguide opening 2114 is 40 mm-45 mm, such as 40 mm, 43 mm and 45 mm. For example, 40 mm, 44 mm or 45 mm. Specifically, the size of the first waveguide opening 2113 is 53 mm*44.5 mm, and the size of the second waveguide opening 2114 is 40.386 mm*20.193 mm.

[0045] In some embodiments, the antenna array 2 is an integrated structure or is formed by splicing multiple structures.

[0046] In some embodiments, Figure 2 As shown, the first array unit 21 includes a first array mounting frame 214 and a second array mounting frame 215. The first array mounting frame 214 and the second array mounting frame 215 have the same structure and are arranged in a mirror-symmetrical manner along the vertical direction. The first array mounting frame 214 and the second array mounting frame 215 are detachably connected. Specifically, it can be spliced ​​or connected by bolts, etc. In this embodiment, the first array mounting frame 214 and the second array mounting frame 215 are spliced ​​together. The first array mounting frame 214 and the second array mounting frame 215 are combined to form the first array unit 21, and then multiple array units are assembled into a complete antenna array 2, which is convenient for transportation and installation.

[0047] It should be noted that when the antenna array 2 is formed by splicing multiple structures, it is not limited to the splicing method described above. For example, the first array mounting frame 214 and the second array mounting frame 215 can also be formed in one piece and serve as a separate splicing unit.

[0048] In some embodiments, in combination Figure 2 and Figure 6 As shown, Figure 6 What is shown is the front side of the first array mounting frame 214. The front sides of the first array mounting frame 214 and the second array mounting frame 215 are both provided with three array slots 2141 spaced apart in the lateral direction, and the array slots 2141 are U-shaped; the three array slots 2141 of the first array mounting frame 214 are connected in sequence with the three array slots 2141 of the second array mounting frame 215, respectively enclosing to form the first speaker channel 211, the second speaker channel 212 and the third speaker channel 213.

[0049] In some embodiments, in combination Figure 6 and Figure 7 As shown, Figure 7The back side of the second array mounting frame 214 is shown. The back side of the first array mounting frame 214 is provided with a first matching groove 2142, a second matching groove 2143, a third matching groove 2144 and a fourth matching groove 2145 in sequence along the transverse direction. The first matching groove 2142 has the same structure as the fourth matching groove 2145. The cross-sectional shape of the first matching groove 2142 is a trapezoid and is symmetrically distributed at both ends of the first array mounting frame 214. The second matching groove 2143 has the same structure as the third matching groove 2144. The cross-sectional shape of the second matching groove 2143 is a hexagon. The second matching groove 2143 and the third matching groove 2144 are spaced apart between the first matching groove 2142 and the second matching groove 2143; the three array grooves 2141 of the first array mounting frame 214 are correspondingly formed with three array protrusions 2146 on the back side of the first array mounting frame 214, and the three array protrusions 2146 are sequentially distributed along the lateral direction between the first matching groove 2142 and the second matching groove 2143, between the second matching groove 2143 and the third matching groove 2144, and between the third matching groove 2144 and the fourth matching groove 2145. By arranging the first matching groove 2142, the second matching groove 2143, the third matching groove 2144 and the fourth matching groove 2145 on the first array mounting frame 214, not only can the interference of the material of the first array mounting frame 214 itself to the first speaker channel 211, the second speaker channel 212 and the third speaker channel 213 be reduced, thereby improving the overall gain of the antenna array 2; but also the production cost can be reduced, the weight of the antenna array 2 can be reduced, and the movement of the C-band horn antenna can be facilitated.

[0050] The above is an introduction to the specific structure of the C-band horn antenna. The following is an introduction to the design principle and working performance of the C-band horn antenna.

[0051] First, the system requirements of the C-band horn antenna are clarified, as shown in Table 1.

[0052] Table 1 System requirements for C-band horn antenna

[0053] Band Type C pulse Frequency range (GHz) VSWR ＜2.0 Passive antenna gain (dBi) >10dBi Polarization Vertical polarization Horizontal mechanical adjustment range (deg) ±50 Mechanical adjustment range in pitch direction (deg) 0～80 Horizontal beam width (deg) ≥50 Elevation beam width (deg) ≥50 EIRP Limit (dBW) ≥50

[0054] Establish a basic model and coordinate system. The equipment is divided into equipment inside the bunker and equipment outside the bunker. The equipment inside the bunker is the power supply, power amplifier, signal generator and generator; the equipment outside the bunker is the C-band horn antenna. The RF signal is sent from the bunker to the antenna through a low-loss transmission line, and the antenna achieves coverage in the given coordinate system. Fig. 9 As shown, the rectangular coordinate system is defined as follows:

[0055] Origin: located at the center of the antenna 20. If it is a speaker array, it is at the center of the speaker array aperture.

[0056] OZ axis direction: the plane on the vertical platform (parallel to the ground) points to the zenith;

[0057] OX axis direction: The OXZ plane passes through the maximum radiation point of the antenna, the OX axis is perpendicular to the OZ axis and parallel to the ground plane;

[0058] OY axis direction: perpendicular to OX axis and OZ axis, and forming a right-hand spiral relationship;

[0059] The polar coordinate system is as follows:

[0060] Direction: A straight line away from the origin pointing to any space, along The coordinates of the point ball in the direction only have the r component gain, and the components in other directions remain unchanged;

[0061] Direction: The θ unit gain direction of a point in the airspace, along The spherical coordinates of the point in the direction only have the θ component gain, and the other directional components remain unchanged. The θ angle at the point is defined as the angle between the line connecting the point and the origin and the OZ axis, and its value space is [0,π];

[0062] Direction: A point in the airspace Unity gain direction, along The coordinates of the point ball in the direction are only Component gain, other direction components remain unchanged; The angle is defined as the angle between the projection of the point on the XOY plane and the OX axis, and its value space is [0,2π];

[0063] In the above defined coordinate system, the EIRP requirement of the C-band is plotted as a graph. The EIRP requirement curve 10 of the C-band horn antenna is as follows: Fig.10 As shown in , the shaped coverage space of the C-band horn antenna is Where x∈[0°,80°] is the mechanical adjustment range of pitch, y∈[-50°,50°] is the mechanical adjustment range of horizontal, and θ is the 3dB beamwidth in the spatial domain. The spatial domain is 3dB beamwidth.

[0064] Therefore, the overall design idea of ​​the C-band horn antenna is as follows:

[0065] The horn antenna has two functions: horn signal radiation and phased array antenna calibration. According to the index requirements of the horn antenna, its power capacity is large, and waveguide feeding limits its implementation to only flat antennas or horn antennas. Its lobe width is 50 degrees × 50 degrees, so the best implementation method is the horn antenna. At the same time, a properly designed horn antenna can ensure the stability of the phase center within the main lobe range, which is beneficial to the calibration accuracy of the phased array antenna.

[0066] Combined with Table 2, the specific design indicators of the C-band horn antenna are as follows:

[0067] Table 2 Design indicators of C-band horn antenna

[0068]

[0069] Combined with Table 3, the indicator budget table of the C-band horn antenna is as follows:

[0070] Table 3 Index budget table of C-band horn antenna

[0071]

[0072]

[0073] Since the number of phased array units is 16*16 units, it generates 14 side lobes in the horizontal direction and the elevation direction. Except for the side lobes in the horizontal direction and the elevation direction which are -20dBc, the other side lobes are 5dB lower than the first side lobe on average. Therefore, the EIRP (effective radiated power) requirement of the horn is 67-20+3-5=45dBW.

[0074] The structural model of C-band horn antenna is combined with Figure 1 and Figure 2 As shown in the figure, the C-band horn antenna adopts a 3×3 array, only the most central horn channel is fed, and the other 8 horn channels are virtual elements, one is to improve the gain of the antenna array, and the other is to make the lobe width change less drastically with frequency within the frequency range. The total weight of the C-band horn antenna is 14Kg.

[0075] Then the C-band horn antenna is simulated, and the simulation results are as follows:

[0076] 1) Standing wave ratio

[0077] like Fig.11 As shown, in the C-band range of 5.2 GHz-5.8 GHz, the VSWR (standing wave ratio) of the antenna is less than 1.2.

[0078] 2) Three-dimensional directional diagram

[0079] The three-dimensional radiation pattern of the C-band horn antenna is as follows Fig.12 and Fig.13 As shown by Fig.12 and Fig.13 It can be seen that the simulated beam of the C-band horn antenna meets the design index requirements and the antenna gain is high.

[0080] 3) Two-dimensional directional pattern

[0081] Specific as Fig.14 and Fig.15As shown in the figure, in the C-band 5.25GHz-5.75GHz range, the VSWR of the horn antenna is less than 1.2, and the antenna gain is above 10dBi. The elevation beam width is 54°~58°, and the azimuth beam width is 53°~39° with little variation.

[0082] In summary, the C-band horn antenna adopts a 3×3 horn antenna array, and only the central horn channel is fed. The elevation beam width is 54°~58°, the azimuth beam width is 53°~59°, and the gain reaches 10dBi.

[0083] The design dimensions of the antenna array are 178mm (length) × 153mm (width) × 190mm (height), with a total weight of approximately 14kg.

[0084] It can be seen that the present application discloses a C-band horn antenna, including a support base and an antenna array, the antenna array is arranged on the support base, the antenna array includes a first array unit, a second array unit and a third array unit with the same structure, the first array unit, the second array unit and the third array unit are arranged in sequence along the vertical direction; the first array unit includes a first horn channel, a second horn channel and a third horn channel arranged in sequence along the transverse direction, the second array unit includes a fourth horn channel, a fifth horn channel and a sixth horn channel arranged in sequence along the transverse direction, and the third array unit includes a seventh horn channel, an eighth horn channel and a ninth horn channel arranged in sequence along the transverse direction. In the present application, the feeding conditions of each horn channel are reasonably allocated, the fifth horn channel is located at the center of the antenna array, and only the fifth horn channel is fed, and the remaining horn channels are virtual elements and are not fed, the lobe width changes more smoothly with frequency, and the antenna array gain is high. In the C-band 5.25GHz-5.75GHz range, the VSWR of the horn antenna is less than 1.2, and the antenna gain is above 10dBi.

[0085] 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 C-band horn antenna, characterized in that: It includes a support base and an antenna array, the antenna array is arranged on the support base, the antenna array includes a first array unit, a second array unit and a third array unit with the same structure, the first array unit, the second array unit and the third array unit are arranged in sequence along the vertical direction; the first array unit includes a first speaker channel, a second speaker channel and a third speaker channel arranged in sequence along the transverse direction, the second array unit includes a fourth speaker channel, a fifth speaker channel and a sixth speaker channel arranged in sequence along the transverse direction, the third array unit includes a seventh speaker channel, an eighth speaker channel and a ninth speaker channel arranged in sequence along the transverse direction; the fifth speaker channel is located at the center of the antenna array, and only the fifth speaker channel is fed.

2. The C-band horn antenna according to claim 1, characterized in that: The length of the antenna array is 170mm-180mm, the width of the antenna array is 150mm-160mm, and the height of the antenna array is 185mm-195mm.

3. The C-band horn antenna according to claim 1, characterized in that: The first horn channel includes a first channel portion and a second channel portion, the first channel portion is horn-shaped, the front end of the first channel portion has a first waveguide opening, the first waveguide opening is rectangular, the opening area of ​​the first channel portion gradually decreases from front to back, the second channel portion is connected to the rear end of the first channel portion, the rear end of the second channel portion has a second waveguide opening, the second waveguide opening is rectangular, and the opening area of ​​the second channel portion remains unchanged.

4. The C-band horn antenna according to claim 3, characterized in that: The length of the first waveguide opening is 50mm-55mm, the height of the first waveguide opening is 40mm-45mm, the length of the second waveguide opening is 20mm-25mm, and the height of the second waveguide opening is 40mm-45mm.

5. The C-band horn antenna according to claim 1, characterized in that: The antenna array is an integrated structure or is formed by splicing multiple structures.

6. The C-band horn antenna according to claim 1, characterized in that: The first array unit includes a first array mounting frame and a second array mounting frame. The first array mounting frame and the second array mounting frame have the same structure and are arranged in a mirror-symmetrical manner along the vertical direction. The first array mounting frame and the second array mounting frame are detachably connected.

7. The C-band horn antenna according to claim 6, characterized in that: The front sides of the first array mounting frame and the second array mounting frame are each provided with three array slots spaced apart in the lateral direction, and the array slots are U-shaped; the three array slots of the first array mounting frame are connected in sequence with the three array slots of the second array mounting frame to respectively enclose and form the first speaker channel, the second speaker channel and the third speaker channel.

8. The C-band horn antenna according to claim 7, characterized in that: The back side of the first array mounting frame is provided with a first matching groove, a second matching groove, a third matching groove and a fourth matching groove in sequence along the transverse direction. The first matching groove has the same structure as the fourth matching groove and is symmetrically distributed at both ends of the first array mounting frame. The second matching groove has the same structure as the third matching groove, and the second matching groove and the third matching groove are spaced apart and distributed between the first matching groove and the second matching groove. The three array grooves of the first array mounting frame are correspondingly formed with three array protrusions on the back side of the first array mounting frame, and the three array protrusions are sequentially distributed along the transverse direction between the first matching groove and the second matching groove, between the second matching groove and the third matching groove, and between the third matching groove and the fourth matching groove.

9. The C-band horn antenna according to claim 8, characterized in that: The cross-sectional shape of the first matching groove is a trapezoid; the cross-sectional shape of the second matching groove is a hexagon.

10. The C-band horn antenna according to claim 1, characterized in that: The antenna array is mounted on the support base at an elevation angle of 40°-50°.

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