Low rcs end-fire antenna for carrier platform

Abstract

The application relates to a low-RCS end-fire antenna applied to a carrier platform, which comprises a metal patch, a dielectric substrate and a metal ground plate, wherein the dielectric substrate is formed by the intersecting and coinciding parts of two same first circular substrates, or the shape of the dielectric substrate is an ellipse; the metal patch is printed on the upper surface of the dielectric substrate and the shape of the metal patch matches the shape of the dielectric substrate; and the metal ground plate is printed on the lower surface of the dielectric substrate and the shape of the metal ground plate is the same as that of the dielectric substrate. According to the shape modification of the dielectric substrate and the metal patch, the resonant frequency and the radiation pattern of the metal patch can be kept unchanged, and the good radiation performance of the antenna is ensured; when electromagnetic waves are irradiated at a grazing incidence, the shape modification technology changes the scattering current direction and reduces the scattering current amplitude, so that the radar cross section of the antenna is reduced to a certain extent; the low-RCS horn antenna meets the radiation requirements and reduces the antenna RCS at the same time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of antennas, and particularly relates to a low-RCS end-fire antenna applied to a carrier platform. BACKGROUND

[0002] Low-profile end-fire antennas are widely required in carrier platforms and certain wireless systems, and are mostly used for direction finding, long-distance communication or monitoring of ground and air targets. With the increasing complexity of electromagnetic environment, the requirement for low scattering is also more and more important. In order to make end-fire antennas widely applied to various platforms, the low-RCS design of end-fire antennas is increasingly prominent. In addition to realizing the functions of direction finding and long-distance communication, the end-fire antennas also need to meet the performance of extremely low radar cross section. Due to the limitation of the surface space of various platforms and the requirement of application background, and the consideration of aerodynamics and mechanical strength, the antennas are usually required to have the characteristics of low profile, light weight, simple structure and easy conformal, etc. In addition, the surface of various electronic systems (such as the side of the fuselage, the top of the vehicle or the side of the direction finding device) sometimes has a large-size metal conductor surface, and the antenna often needs to be closely attached to the conductor surface. Therefore, the low-scattering design of the antenna under the condition of having a metal floor has very important practical significance.

[0003] In the field of wireless communication, the signal transmitting and receiving system is one of the most important components of the entire communication platform, and the antenna is the core part of the system, and the radiation characteristic is the main index for measuring the advantages and disadvantages of the antenna. In addition, the key to improving the scattering characteristic lies in how to reduce the radar cross section, and the radar cross section is the most basic parameter of the scattering characteristic, which is a measure of the returned power of the target in a given direction under the irradiation of a plane wave.

[0004] The scattering of the antenna can be divided into structural mode term scattering and antenna mode term scattering. The structural mode term scattering is contributed by the structure of the antenna itself, and is only affected by the material and physical structure of the antenna. Therefore, the scattering of the antenna itself can be appropriately reduced by reasonably designing the shape and material of the antenna. The antenna mode term scattering is formed by the reflection and secondary radiation of the external electromagnetic wave at the antenna load due to the mismatch of the antenna termination. As can be seen, the antenna mode term scattering field is closely related to the radiation of the antenna. Therefore, it is difficult to reduce the radar scattering cross section of the antenna within the band.

[0005] In recent years, most of the end-fire antennas proposed by scholars are the reduction of Vivaldi antennas and Yagi antennas, etc. The low radar cross section antenna design is realized by shape modification, application of new materials and other reduction technologies. However, most of them do not conduct low radar scattering cross section (RCS) design research under the condition of complete floor. At present, there are few low-scattering researches on horn antennas under the condition of large-angle grazing incidence, and such researches have very important research value and application significance.

[0006] Therefore, how to reduce the radar scattering cross section of the horn antenna while ensuring good radiation characteristics becomes a technical problem to be solved. SUMMARY

[0007] In order to solve the above problems in the prior art, the application provides a low RCS end-fire antenna applied to a carrier platform.

[0008] The low RCS end-fire antenna applied to the carrier platform comprises a metal patch, a dielectric substrate and a metal ground plate.

[0009] The dielectric substrate is formed by the intersecting and overlapping parts of two identical first circular substrates, or the dielectric substrate is in an elliptical shape.

[0010] The metal patch is printed on the upper surface of the dielectric substrate and has a shape matching that of the dielectric substrate; the metal patch comprises a first part and a second part, both of which are in an arc shape and gradually increase in width along the long axis of the dielectric substrate, the second part gradually decreases in width and is shorter than the first part; the second part is combined with the first part, and the width of the second part at the combined part is smaller than that of the first part.

[0011] The metal ground plate is printed on the lower surface of the dielectric substrate and has the same shape as the dielectric substrate, and the length and width of the metal ground plate are the same as those of the dielectric substrate.

[0012] The dielectric substrate is provided with a SIW structure, a tuning via structure, a three-order ridge structure and a circular truncated cone feed structure; the SIW structure and the tuning via structure are punched and made in the dielectric substrate, the SIW structure is in a horn shape and is arranged along the long axis of the dielectric substrate, the tuning via structure is arranged at the position close to the via at the opening end of the SIW structure, and the metal patch covers the SIW structure and the tuning via structure; the three-order ridge structure is slot-printed on the upper surface of the dielectric substrate and is arranged along the long axis of the dielectric substrate, and the metal patch surface is provided with an opening corresponding to the three-order ridge structure, and the three-order ridge structure is located inside the SIW structure; the circular truncated cone feed structure is arranged on the lower surface of the dielectric substrate and is connected with the bottom of the three-order ridge structure; the circular truncated cone feed structure is connected with a coaxial line, and a via is formed in the metal ground plate to lead out the coaxial line.

[0013] In one embodiment of the present application, the length, width and thickness of the medium substrate are 62.8 mm, 52 mm and 3.175 mm, respectively, and the relative dielectric constant is 2.2.

[0014] The length, width and thickness of the metal floor are 62.8 mm, 52 mm and 0.5 mm, respectively.

[0015] In one embodiment of the present application, the first part extends along the long axis of the medium substrate from one end of the medium substrate to the middle position of the medium substrate, and the shape of the first part matches the shape of the medium substrate; the second part extends along the long axis of the medium substrate from the middle position of the medium substrate to the other end of the medium substrate.

[0016] In one embodiment of the present application, the length and width of the first part are 31.4 mm and 52 mm, respectively; the length and width of the second part are 27.6 mm and 35.4 mm, respectively.

[0017] In one embodiment of the present application, the SIW structure comprises a circular arc part, a translation part and an offset part, wherein,

[0018] The circular arc part is formed by rotating a plurality of through holes around a coaxial center;

[0019] The translation part is obtained by translating a plurality of through holes from the through holes at the opening of the circular arc part along the long axis of the medium substrate;

[0020] The offset part is obtained by offsetting a plurality of through holes from the through holes at the end of the translation part along the long axis of the medium substrate at a target offset angle;

[0021] The tuning through hole structure is located at the opening formed by the offset part.

[0022] In one embodiment of the present application, the circular arc part comprises 12 through holes, the rotation angle of the through holes is 10°, and the interval between adjacent two through holes is 1.7 mm;

[0023] The translation part comprises 4 through holes, which are evenly and symmetrically distributed on both sides of the long axis of the medium substrate;

[0024] The offset part comprises 26 through holes, which are evenly and symmetrically distributed on both sides of the long axis of the medium substrate, the interval between adjacent two through holes is 1.7 mm, and the target offset angle is 45°;

[0025] The radius of each through hole in the circular arc part, the translation part and the offset part is 0.5 mm;

[0026] The tuning via structure comprises two vias, the two vias are averagely and symmetrically distributed on both sides of the long axis of the dielectric substrate, and the radius of the two vias is 1mm.

[0027] In one embodiment of the present application, the third-order ridge structure comprises a first-order ridge structure, a second-order ridge structure and a third-order ridge structure, wherein,

[0028] The first-order ridge structure, the second-order ridge structure and the third-order ridge structure are sequentially connected, and along the long axis direction of the dielectric substrate, the length, the width and the thickness of the first-order ridge structure, the second-order ridge structure and the third-order ridge structure sequentially decrease.

[0029] The circular truncated cone feed structure is in contact with the bottom part of the first-order ridge structure.

[0030] In one embodiment of the present application, the length, the width and the thickness of the first-order ridge structure are 16.5mm, 4.5mm and 2.3mm respectively, the length, the width and the thickness of the second-order ridge structure are 4.8mm, 3.8mm and 1.9mm respectively, and the length, the width and the thickness of the third-order ridge structure are 4.2mm, 2mm and 1.4mm respectively.

[0031] In one embodiment of the present application, the upper base radius of the circular truncated cone feed structure is greater than the lower base radius.

[0032] In one embodiment of the present application, the upper base radius of the circular truncated cone feed structure is 1.5mm, the lower base radius is 0.5mm, and the height is 0.875mm.

[0033] Compared with the prior art, the present application has the following advantages:

[0034] The antenna medium substrate of the present application is formed by the intersecting and overlapping parts of two identical first circular substrates, the shape of the radiation matches the shape of the medium substrate, and by modifying the shape of the medium substrate and the metal patch, the resonant frequency and the radiation pattern of the metal patch can be realized without changing, ensuring good radiation performance of the antenna; when electromagnetic waves are incident, the modified technology will change the direction of the scattered current and reduce the amplitude of the scattered current, so that the antenna radar cross section is reduced to a certain extent; the antenna overcomes the problem of single station reduction of the end-fire direction of the end-fire antenna, and combines with the actual application situation, the low RCS horn antenna realizes the radiation requirements while reducing the antenna RCS. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The overall structure schematic diagram of the low RCS end-fire antenna applied to the carrier platform provided by the embodiment of the present application is shown in the figure.

[0036] Figure 2 A structural distribution diagram of the low RCS end-fire antenna applied to the carrier platform is provided for the embodiment of the present application.

[0037] Figure 3 A structural diagram of the metal iron sheet is provided for the embodiment of the present application.

[0038] Figure 4 A structural diagram of the dielectric substrate is provided for the embodiment of the present application.

[0039] Figure 5 A structural diagram of the metal floor is provided for the embodiment of the present application.

[0040] Figures 6a-6d Radiation patterns of different planes are provided for the embodiment of the present application.

[0041] Figures 7a-7b A single station radar cross section diagram is provided for the embodiment of the present application. DETAILED DESCRIPTION

[0042] The present application will be further described in detail below with specific embodiments, but the embodiments of the present application are not limited thereto.

[0043] Embodiment One

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 A whole structural diagram of the low RCS end-fire antenna applied to the carrier platform is provided for the embodiment of the present application, Figure 2 A structural distribution diagram of the low RCS end-fire antenna applied to the carrier platform is provided for the embodiment of the present application.

[0045] The low RCS end-fire antenna applied to the carrier platform of the present embodiment comprises a metal patch 1, a dielectric substrate 2 and a metal floor 3.

[0046] Please refer to Figure 3 , Figure 4 and Figure 5 , Figure 3 A structural diagram of the metal iron sheet is provided for the embodiment of the present application, Figure 4 A structural diagram of the dielectric substrate is provided for the embodiment of the present application, Figure 5 A structural diagram of the metal floor is provided for the embodiment of the present application.

[0047] As shown in Figure 4 , the dielectric substrate 2 is formed by the intersecting and overlapping parts of two identical circular substrates, i.e. the intersecting and overlapping of two circular substrates with the same radius and thickness, and the intersecting and overlapping parts form the dielectric substrate 2. It can be understood that the shape of the dielectric substrate 2 can also be elliptical.

[0048] In one specific embodiment, the length, width, and thickness of the dielectric substrate 2 are 62.8 mm, 52 mm, and 3.175 mm, respectively, and the relative permittivity is 2.2.

[0049] like Figure 3 As shown, a metal patch 1 is printed on the upper surface of a dielectric substrate 2, and its shape matches the shape of the dielectric substrate 2. The metal patch 1 includes a first part 11 and a second part 12. Both the first part 11 and the second part 12 are arc-shaped structures. Along the long axis of the dielectric substrate 2, the width of the first part 11 gradually increases, and the width of the second part 12 gradually decreases. The length of the second part 12 is less than the length of the first part 11. The second part 12 is combined with the first part 11, and at the joint, the width of the second part 12 is less than the width of the first part 11.

[0050] In one specific embodiment, the first portion 11 extends along the long axis of the dielectric substrate 2 from one end of the dielectric substrate 2 to the middle position of the dielectric substrate 2, and the shape of the first portion 11 matches the shape of the dielectric substrate 2; the second portion 12 extends along the long axis of the dielectric substrate 2 from the middle position of the dielectric substrate 2 to the other end of the dielectric substrate 2.

[0051] It is understandable that when two identical circular substrates intersect and overlap, a portion of the intersecting and overlapping structure is taken along the long axis of the intersecting and overlapping structure to form the first part 11. For example, when the first part 11 extends to the middle position of the dielectric substrate 2, half of the intersecting and overlapping structure is taken along the long axis of the intersecting and overlapping structure to form the first part 11, that is, the first part 11 is half of the dielectric substrate 2 along the long axis.

[0052] Two identical circular substrates intersect and overlap. A portion of the intersecting and overlapping structure is taken along the long axis of the structure to form a second portion 12, and the radius of the circular substrate forming the second portion 12 is smaller than the radius of the circular substrate forming the first portion 11. When the second portion 12 extends from the middle position of the dielectric substrate 2, the second portion 12 is located within the other half of the surface of the dielectric substrate 2, and the length and width of the second portion 12 are both smaller than the length and width of the other half of the dielectric substrate 2, that is, the length and width of the second portion 12 are both smaller than the length and width of the first portion 11.

[0053] It is understandable that the shape of the metal patch 1 is similar to that of the dielectric substrate 2, with one half of the shape being the shape of the dielectric substrate 2 and the other half being an arc formed by the intersection and overlap of two circles.

[0054] In one specific embodiment, the length and width of the first part 11 are 31.4 mm and 52 mm respectively; the length and width of the second part 12 are 27.6 mm and 35.4 mm respectively.

[0055] The metal iron sheet of the embodiment regulates the scattering current, and realizes reduction of the single-station radar cross section.

[0056] As shown in Figure 5 , the metal floor 3 is printed on the lower surface of the dielectric substrate 2, and has the same shape as the dielectric substrate 2, and the length and width are also the same as the length and width of the dielectric substrate 2.

[0057] In one specific embodiment, the length, width and thickness of the metal floor 3 are 62.8 mm, 52 mm and 0.5 mm, respectively.

[0058] Please refer again to Figure 4 , the SIW structure 21 and the tuning via structure 22 are punched in the dielectric substrate 2, the SIW structure 21 is horn-shaped and arranged along the long axis of the dielectric substrate 2, the tuning via structure 22 is arranged at the opening end of the SIW structure 21, and the metal patch 1 covers the SIW structure 21 and the tuning via structure 22.

[0059] Specifically, the SIW structure 21 is symmetrical along the long axis of the dielectric substrate 2, one end is closed, and the other end is open and the width of the opening gradually increases, thereby forming a horn shape. The tuning via structure 22 is arranged at the position close to the via at the opening end of the SIW structure 21.

[0060] In one specific embodiment, the SIW structure 21 includes a circular arc portion 211, a translation portion 212 and an offset portion 213. The circular arc portion 211 is formed by rotating a plurality of vias around a coaxial center; the translation portion 212 is obtained by translating a plurality of vias from the vias at the opening of the circular arc portion 211 along the long axis of the dielectric substrate 2; the offset portion 213 is obtained by offsetting a plurality of vias from the vias at the end of the translation portion 212 along the long axis of the dielectric substrate 2 by a target angle; and the tuning via structure 22 is located at the opening formed by the offset portion 213.

[0061] In one specific embodiment, the dielectric substrate 2 is provided with 42 metalized vias for the SIW structure 21 and two metalized vias for the tuning via structure 22.

[0062] Specifically, the 42 vias for the SIW structure 21, i.e. the radius of each via in the circular arc portion 211, the translation portion 212 and the offset portion 213, is 0.5 mm.

[0063] The circular arc part 211 includes 12 through holes, and the rotation angle of the through holes is 10°, and the interval between adjacent two through holes is 1.7 mm, that is, 12 holes are punched at an interval of 1.7 mm every 10° around the coaxial center, to form the circular arc part 211. The translation part 212 includes 4 through holes, which are evenly and symmetrically distributed on both sides of the long axis of the dielectric substrate 2, that is, 2 through holes are translated on both sides along the long axis of the dielectric substrate 2 from the through hole at the opening of the circular arc part 211, to obtain the translation part 212. The offset part 213 includes 26 through holes, which are evenly and symmetrically distributed on both sides of the long axis of the dielectric substrate 2, and the interval between adjacent two through holes is 1.7 mm, and the target offset angle is 45°, that is, the long axis of the dielectric substrate 2 is taken as the symmetry axis, and 13 holes are punched at an interval of 1.7 mm up and down with an offset angle of 45°.

[0064] The tuning through hole structure 22 includes 2 through holes, which are evenly and symmetrically distributed on both sides of the long axis of the dielectric substrate 2, and the radius of the 2 through holes is twice the aperture of the SIW structure, specifically, the radius of the 2 through holes is 1 mm. Further, 1 metalized via hole is punched near the end through hole of the offset part 213 on both sides of the long axis of the dielectric substrate 2 to form the tuning through hole structure 22. Further, the distance between the tuning through hole structure 22 and the end through hole of the SIW structure 21 is determined according to the frequency of the end-fire antenna.

[0065] Please refer to Figure 3 and Figure 4 The third-order ridge structure 23 is slot-printed on the upper surface of the dielectric substrate 2 and arranged along the long axis of the dielectric substrate 2, and the surface of the metal patch 1 is provided with an opening corresponding to the third-order ridge structure 23, and the third-order ridge structure 23 is located inside the SIW structure 21.

[0066] Specifically, the third-order ridge structure 23 is made by slotting and copper plating on the dielectric substrate 2. The overall structure of the third-order ridge structure 23 includes a first-order ridge structure 231, a second-order ridge structure 232 and a third-order ridge structure 233. The first-order ridge structure 231, the second-order ridge structure 232 and the third-order ridge structure 233 are connected in sequence, and along the long axis of the dielectric substrate 2, the length, the width and the thickness of the first-order ridge structure 231, the second-order ridge structure 232 and the third-order ridge structure 233 decrease in sequence.

[0067] In one specific embodiment, the length, the width and the thickness of the first-order ridge structure 231 are 16.5 mm, 4.5 mm and 2.3 mm in sequence, the length, the width and the thickness of the second-order ridge structure 232 are 4.8 mm, 3.8 mm and 1.9 mm in sequence, and the length, the width and the thickness of the third-order ridge structure 233 are 4.2 mm, 2 mm and 1.4 mm in sequence.

[0068] Please refer to Figure 4and Figure 5 The circular truncated cone feed structure 24 is arranged on the lower surface of the dielectric substrate 2 and connected with the bottom of the third-order ridge structure 23; the coaxial line 25 is connected with the circular truncated cone feed structure 24, and a through hole is arranged on the metal ground plate 3 to lead out the coaxial line 25.

[0069] Specifically, the third-order ridge structure is welded with the circular truncated cone feed structure 24. The upper bottom surface of the circular truncated cone feed structure 24 is in contact with the bottom of the first-order ridge structure 231, and the contact area between the circular truncated cone feed structure 24 and the bottom of the first-order ridge structure 231 is determined according to the working frequency of the device.

[0070] In one specific embodiment, the radius of the upper bottom surface of the circular truncated cone feed structure 24 is greater than the radius of the lower bottom surface. Specifically, the radius of the upper bottom surface of the circular truncated cone feed structure 24 is 1.5 mm, the radius of the lower bottom surface is 0.5 mm, and the height is 0.875 mm.

[0071] Further, the circular truncated cone feed structure 24 is welded with the coaxial line 25, and the coaxial line 25 feeds the circular truncated cone feed structure 24.

[0072] The antenna of the embodiment is formed by the intersection and overlapping of two identical first circular substrates, the shape of the radiation matches the shape of the dielectric substrate, and by shaping the dielectric substrate and the metal patch, the resonant frequency and the radiation pattern of the metal patch can be realized without changing, and the good radiation performance of the antenna is ensured; when the electromagnetic wave is incident at a grazing angle, the scattering current direction and the scattering current amplitude will be changed due to the shaping technology, so that the radar cross section of the antenna is reduced; the antenna overcomes the problem of single-station reduction of the end-fire direction of the end-fire antenna, and combines the actual application situation, so that the low-RCS horn antenna realizes the reduction of the radar cross section of the end-fire antenna while meeting the radiation requirements.

[0073] In summary, the embodiment is a low-RCS end-fire antenna design applied to a carrier platform, which controls the scattering characteristics under the condition of meeting the radiation performance, controls the scattering current and radiation current through the shaping technology, reduces the single-station radar cross section under the condition of end-fire direction and grazing incidence wave incidence, and realizes the design of low-RCS end-fire antenna.

[0074] The technical effects of the antenna of the embodiment can be further illustrated by simulation experiments:

[0075] 1. Simulation content:

[0076] 1.1 The commercial simulation software HFSS_20.0 is used to simulate and calculate the radiation patterns of the above-mentioned embodiment at 14 GHz and 17 GHz, and the results are shown in Figures 6a-6d , Figures 6a-6d the radiation patterns of different planes provided by the embodiment of the application.Figure 6a , Figure 6b are the E-plane and H-plane radiation patterns of the antenna of the embodiment at 14GHz, Figure 6c , Figure 6d are the E-plane and H-plane radiation patterns of the antenna of the embodiment at 17GHz. It can be seen from Figures 6a-6d that the antenna of the embodiment has good end-fire performance and radiation gain.

[0077] 1.2 The monostatic radar cross section of the above embodiment is simulated and calculated by using commercial simulation software HFSS_20.0, and the result is shown in Figures 7a-7b , Figures 7a-7b is a monostatic radar cross section diagram provided by the embodiment of the application, wherein, Figure 7a is a monostatic radar cross section diagram of the antenna of the embodiment under the incidence of horizontal polarized wave theta=60° within 6-18GHz, Figure 7b is a monostatic radar cross section diagram of the antenna of the embodiment under the incidence of horizontal polarized wave theta=90° within 6-18GHz. It can be seen from Figures 7a-7b that the maximum reduction value of the radar cross section of the antenna of the embodiment reaches 25.9dB at 11.4GHz, and the maximum reduction value of the monostatic radar cross section under the incidence of horizontal polarized wave theta=90° reaches 40.4dB at 13.2GHz.

[0078] The above simulation results show that the antenna of the embodiment has good radiation characteristics, and greatly reduces the in-band radar cross section of the antenna, i.e., improves the scattering characteristics.

[0079] The above is a further detailed description of the application in combination with specific preferred embodiments, and the specific implementation of the application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the application belongs, some simple deductions or substitutions can be made without departing from the concept of the application, and all of them should be regarded as falling within the protection scope of the application.

Claims

1. A low RCS end-fire antenna for application to a carrier platform, characterized by, The antenna comprises a metal patch (1), a dielectric substrate (2) and a metal ground plate (3), wherein, the dielectric substrate (2) is formed by the intersecting and overlapping parts of two identical first circular substrates, or the dielectric substrate (2) is in an elliptical shape; the metal patch (1) is printed on the upper surface of the dielectric substrate (2) and has a shape matching that of the dielectric substrate (2); the metal patch (1) comprises a first part (11) and a second part (12), both of which are in an arc shape, and along the long axis of the dielectric substrate (2), the width of the first part (11) gradually increases, the width of the second part (12) gradually decreases, and the length of the second part (12) is smaller than that of the first part (11); the second part (12) is combined with the first part (11), the first part (11) extends along the long axis of the dielectric substrate (2) from one end of the dielectric substrate (2) to the combination, and at the combination, the width of the second part (12) is smaller than that of the first part (11); the shape of the first part (11) matches that of the dielectric substrate (2); the second part (12) extends along the long axis of the dielectric substrate (2) from the combination to the other end of the dielectric substrate (2); the metal ground plate (3) is printed on the lower surface of the dielectric substrate (2) and has the same shape as that of the dielectric substrate (2), and the length and width of the metal ground plate (3) are the same as those of the dielectric substrate (2); the metal ground plate (3) is a complete and integral structure; the dielectric substrate (2) is provided with a SIW structure (21), a tuning via structure (22), a three-order ridge structure (23) and a circular truncated cone feeding structure (24); the SIW structure (21) and the tuning via structure (22) are punched and made in the dielectric substrate (2), the SIW structure (21) is in a trumpet shape and is arranged along the long axis of the dielectric substrate (2), the tuning via structure (22) is arranged at the position close to the via at the opening end of the SIW structure (21), and the metal patch (1) covers the SIW structure (21) and the tuning via structure (22); the three-order ridge structure (23) is slot-printed on the upper surface of the dielectric substrate (2) and is arranged along the long axis of the dielectric substrate (2), and the surface of the metal patch (1) is provided with an opening corresponding to the three-order ridge structure (23), and the three-order ridge structure (23) is located inside the SIW structure (21); the circular truncated cone feeding structure (24) is arranged on the lower surface of the dielectric substrate (2) and is connected with the bottom of the three-order ridge structure (23); the circular truncated cone feeding structure (24) is connected with a coaxial line (25), and a via is formed in the metal ground plate (3) to lead out the coaxial line (25); the three-order ridge structure (23) comprises a first-order ridge structure (231), a second-order ridge structure (232) and a third-order ridge structure (233), wherein, The first ridge structure (231), the second ridge structure (232) and the third ridge structure (233) are sequentially connected, and the length, the width and the thickness of the first ridge structure (231), the second ridge structure (232) and the third ridge structure (233) decrease sequentially along the long axis direction of the dielectric substrate (2); The circular truncated cone feeding structure (24) is in contact with the bottom part of the first ridge structure (231); The upper base radius of the circular truncated cone feeding structure (24) is greater than the lower base radius.

2. The low RCS end-fire antenna for use on a carrier platform of claim 1, wherein, The length, the width and the thickness of the dielectric substrate (2) are 62.8mm, 52mm and 3.175mm respectively, and the relative dielectric constant is 2.2; The length, the width and the thickness of the metal ground plate (3) are 62.8mm, 52mm and 0.5mm respectively.

3. The low RCS end-fire antenna for use on a carrier platform of claim 1, wherein, The first part (11) extends from one end of the dielectric substrate (2) to the middle position of the dielectric substrate (2) along the long axis of the dielectric substrate (2); and the second part (12) extends from the middle position of the dielectric substrate (2) to the other end of the dielectric substrate (2) along the long axis of the dielectric substrate (2).

4. The low RCS end-fire antenna for use on a carrier platform of claim 1, wherein, The length and the width of the first part (11) are 31.4mm and 52mm respectively; and the length and the width of the second part (12) are 27.6mm and 35.4mm respectively.

5. The low RCS end-fire antenna for use on a carrier platform of claim 1, wherein, The SIW structure (21) comprises a circular arc part (211), a translation part (212) and a deviation part (213), wherein, The circular arc part (211) is formed by rotating a plurality of through holes around the same coaxial center; The translation part (212) is obtained by translating a plurality of through holes from the through holes at the opening of the circular arc part (211) along the long axis of the dielectric substrate (2); The deviation part (213) is obtained by deviating a plurality of through holes from the through holes at the end of the translation part (212) along the long axis of the dielectric substrate (2) by a target deviation angle; The tuning through hole structure (22) is located at the opening formed by the deviation part (213).

6. The low RCS end-fire antenna for use on a carrier platform of claim 5, wherein, The circular arc part (211) comprises 12 through holes, and the rotation angle of the through holes is 10°, and the interval between adjacent two through holes is 1.7mm; The translation part (212) comprises 4 through holes, and the 4 through holes are evenly and symmetrically distributed on both sides of the long axis of the dielectric substrate (2); The deviation part (213) comprises 26 through holes, and the 26 through holes are evenly and symmetrically distributed on both sides of the long axis of the dielectric substrate (2), the interval between adjacent two through holes is 1.7mm, and the target deviation angle is 45°; The radius of each through hole in the circular arc part (211), the translation part (212) and the deviation part (213) is 0.5mm; The tuning through hole structure (22) comprises 2 through holes, and the 2 through holes are evenly and symmetrically distributed on both sides of the long axis of the dielectric substrate (2), and the radius of the 2 through holes is 1mm.

7. The low RCS end-fire antenna for use on a carrier platform of claim 1, wherein, The length, width and thickness of the first ridge structure (231) are 16.5 mm, 4.5 mm and 2.3 mm respectively, the length, width and thickness of the second ridge structure (232) are 4.8 mm, 3.8 mm and 1.9 mm respectively, and the length, width and thickness of the third ridge structure (233) are 4.2 mm, 2 mm and 1.4 mm respectively.

8. The low RCS end-fire antenna for use on a carrier platform of claim 1, wherein, The upper base radius of the circular truncated cone feed structure (24) is 1.5 mm, the lower base radius is 0.5 mm, and the height is 0.875 mm.

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