High temperature resistant passive conformal antenna

Abstract

The application relates to a high-temperature-resistant passive conformal antenna, and belongs to the technical field of passive antennas, which solves the problem of elastic body matching imbalance caused by deep burying in the prior art. The high-temperature-resistant passive conformal antenna comprises a radiation cover plate, a radiation circuit plating layer, a reflection cavity, a first pressing strip and a second pressing strip, wherein the first pressing strip, the radiation cover plate, the radiation circuit plating layer, the reflection cavity and the second pressing strip are sequentially arranged from top to bottom. The passive conformal antenna can resist high temperature, and the elastic body matching imbalance caused by deep burying is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of passive antenna, in particular to a high-temperature-resistant passive conformal antenna. BACKGROUND

[0002] The conventional single-system passive antenna of anti-radiation seeker is located at the front end of the missile body, and is protected by a dielectric antenna cover outside the antenna. Since the missile flight speed is not high and is protected by the cover, the highest temperature of the passive antenna is only about 275 DEG C. The engineering plastics, metal materials and high-temperature solder constituting the passive antenna can meet the use requirements at this temperature.

[0003] With the development of anti-missile countermeasure technology, it is more and more difficult for low-supersonic missiles to achieve penetration, and the high-supersonic missile has become one of the important directions of subsequent missile development.

[0004] The current high-supersonic type under research and pre-research generally adopts a main-passive compound guidance system, in which the passive antenna adopts a conformal antenna form. In order to cope with the aerodynamic heating caused by high-speed flight, an external thermal insulation layout is generally adopted. However, the problem that follows is that the outer thermal insulation layer of the missile body is relatively thick (10-30 mm). The temperature outside the thermal insulation layer reaches 1000 DEG C. The conventional passive antenna will introduce electromagnetic wave penetration due to the "deeply buried" thermal insulation material, thereby introducing serious multipath effect and causing serious frequency band mismatch.

[0005] In summary, the existing passive antenna scheme has two forms of non-conformal and low-temperature (450 DEG C) conformal. There is less research on the antenna conformal to the surface of the high-supersonic platform with a relatively high surface temperature. SUMMARY

[0006] In view of the above analysis, the embodiments of the present application aim to provide a high-temperature-resistant passive conformal antenna to solve the problem of imbalance of missile body matching introduced by the "deeply buried".

[0007] The present application provides a high-temperature-resistant passive conformal antenna, which comprises a radiation cover plate, a radiation circuit plating layer, a reflection cavity, a first pressing strip and a second pressing strip, wherein the first pressing strip, the radiation cover plate, the radiation circuit plating layer, the reflection cavity and the second pressing strip are sequentially arranged from top to bottom.

[0008] Further, the radiation cover plate is woven by quartz fiber.

[0009] Further, the radiation circuit plating layer is made of high-temperature metal and is attached to the inner side of the radiation cover plate.

[0010] Further, the reflection cavity is made of a thermal insulation tile, and an inner cavity is arranged on the upper surface of the reflection cavity.

[0011] Further, the inner cavity is of a stepped type, and the surface thereof is coated with a high-temperature alloy metal.

[0012] Further, the first and second pressing strips are made of high-temperature alloy, and the first and second pressing strips fix the four peripheries of the radiation cover plate, the radiation circuit plating layer and the reflecting cavity.

[0013] Further, the first and second pressing strips conform to the curved surface where the radiation cover plate, the radiation circuit plating layer and the reflecting cavity are located.

[0014] Further, the radiation circuit plating layer is made of silver-palladium alloy.

[0015] Further, the gap circuit of the radiation circuit plating layer is an ultra-wideband radiation circuit.

[0016] Further, the frequency range of the high-temperature-resistant passive conformal antenna is 2-18 GHz.

[0017] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0018] (1) The present application can be applied to a hypersonic vehicle platform surface conformal antenna with a relatively high surface temperature, and can enhance the passive direction-finding distance and effectiveness, and provide a radar with a target detection capability at a relatively large distance.

[0019] (2) The present application adopts an electrical-structural-heat-insulation integrated design, effectively solves the conformal antenna temperature resistance problem, and the antenna can conform to the surface of the projectile, and solves the problem of imbalance of the projectile matching introduced by "deep burying".

[0020] (3) The design of the high-temperature-resistant passive conformal antenna used in the present application can meet the design requirements of different temperatures and costs by changing the types of high-temperature metal plating, high-temperature alloy, high-temperature connector and other metal materials.

[0021] (4) The present application adopts an ultra-wideband slot antenna form, and the antenna gain is greatly improved, and the problem of backward radiation of the antenna is improved.

[0022] In the present application, the above technical solutions can be combined with each other to realize more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. The purpose and other advantages of the present application can be achieved and obtained from the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the application, and are incorporated herein and constitute a part of the detailed description. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application. In the drawings:

[0024] Figure 1A front isometric view of a high temperature resistant passive conformal antenna according to a specific embodiment;

[0025] Figure 2 An exploded schematic view of a high temperature resistant passive conformal antenna according to a specific embodiment;

[0026] Figure 3 A side schematic view of a high temperature resistant passive conformal antenna according to a specific embodiment;

[0027] Figure 4 A bottom view of a high temperature resistant passive conformal antenna according to a specific embodiment;

[0028] Figure 5 A top view of a high temperature resistant passive conformal antenna according to a specific embodiment.

[0029] Reference signs:

[0030] 1 - Radiating cover plate; 2 - Radiating circuit plating; 3 - Reflective cavity; 4 - Thermal insulation medium block; 5 - Connector; 6 - First compression strip; 7 - Second compression strip. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in detail with reference to the drawings, in which:

[0032] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected, it can be mechanically connected, or electrically connected, it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0033] The terms "top", "bottom", "above", "under" and "on" used throughout the description are relative positions of the components of the device, for example, the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional, regardless of their orientation in space.

[0034] Example 1

[0035] A specific embodiment of the present application, as shown in Figures 1-5 discloses a high temperature resistant passive conformal antenna, comprising a radiating cover plate 1, a radiating circuit plating 2, a reflective cavity 3, a thermal insulation medium block 4, a connector 5, a first compression strip 6 and a second compression strip 7.

[0036] The frequency range of the high temperature resistant passive conformal antenna is 2-18 GHz.

[0037] The first pressing strip 6, the radiation cover plate 1, the radiation circuit coating 2, the reflection cavity 3 and the second pressing strip 7 are sequentially connected from top to bottom.

[0038] Specifically, the first pressing strip 6 is arranged above the radiation cover plate 1, the radiation cover plate 1 is arranged above the radiation circuit coating 2, the radiation circuit coating 2 is arranged above the reflection cavity 3, and the second pressing strip 7 is arranged below the reflection cavity 3.

[0039] Further, the heat insulation medium block 4 is arranged in the reflection cavity 3, and the connector 5 is arranged below the reflection cavity 3 and located in the inner side region of the second pressing strip 7.

[0040] The radiation cover plate 1 is made of quartz fiber with high temperature resistance and conforms to the carrier platform.

[0041] The radiation cover plate 1 cooperates with the first pressing strip 6, the outer side edge of the radiation cover plate 1 is provided with a step, and the height of the step is the same as the thickness of the first pressing strip 6.

[0042] In order to ensure the thickness of the radiation cover plate 1 and facilitate process implementation, the inner side edge of the radiation cover plate 1 is provided with a step with the same height.

[0043] In the embodiment, the radiation cover plate 1 is an arc-shaped plate, and the edge of the arc-shaped plate is provided with a mounting hole.

[0044] The radiation circuit coating 2 is made of high-temperature metal and is attached to the inner side of the radiation cover plate 1 and is designed with a circuit matched with the connector 5.

[0045] Specifically, the radiation circuit coating 2 is made of silver-palladium alloy with high temperature resistance.

[0046] In the embodiment, the antenna radiation circuit formed by the high-temperature metal liquid slurry through the coating-laser etching process is attached to the inner side of the radiation cover plate 1, wherein the gap circuit is designed as an ultra-wideband radiation circuit, and the front end is designed with a circuit matched with the connector 5.

[0047] The radiation circuit coating 2 conforms to the radiation cover plate 1 and is arranged in the middle region of the inner side of the radiation cover plate 1.

[0048] The reflection cavity 3 is made of a heat insulation tile, the inner cavity surface is coated with high-temperature alloy metal, the inner cavity size is related to the working frequency band of the antenna, and is of a stepped type.

[0049] Specifically, the reflection cavity 3 is made of a heat insulation tile, the inner cavity surface of the reflection cavity 3 is a metal surface, and the high-temperature alloy metal coating process is adopted.

[0050] In this embodiment, the inner cavity size is related to the antenna operating frequency band, and is a stepped type.

[0051] To cooperate with the second pressing strip 7, the inner side edge of the reflection cavity 3 is provided with a step with the same thickness as the second pressing strip 7,

[0052] In this embodiment, the reflection cavity 3 is an arc-shaped plate, and the edge thereof is provided with a mounting hole for connecting with the first pressing strip 6 and the second pressing strip 7.

[0053] The heat insulation medium block 4 is made of heat insulation tiles, and is conformal to the inner cavity of the reflection cavity 3 and is installed in the inner cavity of the reflection cavity 3.

[0054] The heat insulation medium block 4 is used for heat insulation of the antenna and support of the radiation cover plate 1, and increases the reliability of the antenna structure.

[0055] It is worth noting that the heat insulation medium block 4 is a stepped structure, similar to a “tower”, and the thickness of the bottom of the heat insulation medium block 4 is greater than the thickness of the top. The shape of the heat insulation medium 4 corresponds to the operating frequency band of the antenna, and different widths and depths are designed according to the operating frequency.

[0056] Further, the heat insulation medium block 4 is divided into multiple layers to adapt to the heat insulation needs in different environments, and in this embodiment, the thickness of each layer is the same.

[0057] The connector 5 adopts a high-temperature-resistant design, the connector 5 passes through the through hole reserved by the reflection cavity 3 and the radiation cover plate 1, is fixed with the first pressing strip 6, and meanwhile the inner core of the connector 5 is electrically connected with the matching circuit of the radiation circuit plating layer 2.

[0058] Specifically, the connector 5 adopts a high-temperature-resistant design, the metal part is a high-temperature alloy, and the medium is a high-temperature-resistant quartz material.

[0059] The end surface of the connector 5 is designed with a cutting surface on one side of the matching circuit of the radiation circuit plating layer 2, so as to improve the electrical performance of the circuit connection.

[0060] The first pressing strip 6 is installed on the outer side four circumferential edges of the radiation cover plate 1, and the second pressing strip 7 is installed on the inner side four circumferential edges of the reflection cavity 3 and is conformal to the curved surface.

[0061] The first pressing strip 6, the radiation cover plate 1, the radiation circuit plating layer 2, the reflection cavity 3, and the second pressing strip 7 are fixed by screws on the four circumferential edges, so as to form a conformal antenna.

[0062] The first pressing strip 6 is located at one side of the connector 5, two fixing ears for mounting the connector 5 are arranged, the connector 5 passes through the through hole reserved in the front end of the radiation cover plate 1 and the reflection cavity 3, and is fixed with the fixing ear of the first pressing strip 6 through a screw, and meanwhile, the inner core of the connector 5 is electrically connected with the front end matching circuit of the radiation circuit plating layer 2.

[0063] In the embodiment, the first pressing strip 6 and the second pressing strip 7 are both made of high-temperature alloy, and are designed as curved surface conformal pressing strips, which are used for structural assembly and fixation between various structural members of the antenna.

[0064] As another possibility of the embodiment, the first pressing strip 6 and the second pressing strip 7 are both segmented structures, which can not only reduce the overall weight of the antenna and save materials, but also balance the stress and avoid the mutual influence of the stress of the first pressing strip 6 and the second pressing strip 7 as a whole.

[0065] The assembly sequence of the antenna of the embodiment is as follows: the heat insulation medium block 4 is placed into the reflection cavity 3; the radiation cover plate 1 is mounted on the reflection cavity 3, the first pressing strip 6 and the second pressing strip 7 are mounted, the screw is passed through the first pressing strip 6, the radiation cover plate 1, the reflection cavity 3 and then is mounted on the second pressing strip 7, and a circle of screws is fastened, the connector 5 is mounted, the connector 5 is fixed on the first pressing strip 6 by two M3 high-temperature screws, and the antenna is assembled.

[0066] In the embodiment, the processing technology of the radiation cover plate 1 is as follows: mold forming → milling machine processing of the outer shape and punching → back metal layer construction; the processing technology of the reflection cavity 3 is as follows: numerical control processing and punching → inner cavity metal coating construction; the processing technology of the heat insulation medium block 4 is numerical control processing forming; and the processing technology of the first pressing strip 6 and the second pressing strip 7 is numerical control processing and punching.

[0067] Embodiment 2

[0068] Another specific embodiment of the application is shown in the accompanying drawings, which discloses a high-temperature-resistant passive conformal antenna. Figures 1-5 The high-temperature-resistant passive conformal antenna comprises a radiation cover plate 1, a radiation circuit plating layer 2, a reflection cavity 3, a heat insulation medium block 4, a connector 5, a first pressing strip 6 and a second pressing strip 7.

[0069] The high-temperature-resistant passive conformal antenna works at a frequency of 2-18 GHz.

[0070] The high-temperature-resistant passive conformal antenna has an outer dimension of 130mm*210mm*27mm.

[0071] The heat insulation medium block 4 is arranged in the reflection cavity 3, the first pressing strip 6 is arranged above the radiation cover plate 1, the radiation cover plate 1 is arranged above the radiation circuit coating 2, the radiation circuit coating 2 is arranged above the reflection cavity 3, the second pressing strip 7 is arranged below the reflection cavity 3, and the connector 5 is arranged below the reflection cavity 3 and located in the inner side region of the second pressing strip 7.

[0072] The radiation cover plate 1 is made of high-temperature-resistant quartz fiber and has a size of 130mm*10mm*2mm and is conformal to the carrier platform.

[0073] The radiation cover plate 1 cooperates with the first pressing strip 6, the outer side edge of the radiation cover plate 1 is provided with a step, the height of the step is the same as the thickness of the first pressing strip 6, and preferably, the height of the step is 1.5mm.

[0074] In order to ensure the thickness of the radiation cover plate 1 and facilitate process implementation, the inner side edge of the radiation cover plate 1 is provided with a step with the same height.

[0075] In the embodiment, the radiation cover plate 1 is an arc-shaped plate, and the edge of the arc-shaped plate is provided with a mounting hole.

[0076] The radiation circuit coating 2 is made of high-temperature-resistant silver-palladium alloy and has a size of 114mm*185*0.1mm.

[0077] In the embodiment, the antenna radiation circuit formed by the high-temperature metal liquid slurry through the coating-laser etching process is attached to the inner side of the radiation cover plate 1, and the gap circuit is designed as an ultra-wideband radiation circuit, and the front end is designed with a circuit matched with the connector 5.

[0078] The radiation circuit coating 2 is conformal to the radiation cover plate 1 and is arranged in the inner side middle region of the radiation cover plate 1.

[0079] The reflection cavity 3 is made of heat insulation tiles and has a size of 130mm*210mm*25mm.

[0080] The inner cavity surface of the reflection cavity 3 is a metal surface and is realized by a high-temperature alloy metal coating process.

[0081] In the embodiment, the inner cavity size is related to the antenna operating frequency band and is of a stepped type.

[0082] In order to cooperate with the second pressing strip 7, the inner side edge of the reflection cavity 3 is provided with a step with the same thickness as the second pressing strip 7,

[0083] Preferably, the height of the step is 1.5mm.

[0084] In this embodiment, the reflecting cavity 3 is an arc-shaped plate, and the edge of the plate is provided with a mounting hole for connecting with the first pressing strip 6 and the second pressing strip 7.

[0085] The heat insulation medium block 4 is made of heat insulation tile, and is conformal with the inner cavity of the reflecting cavity 3.

[0086] The heat insulation medium block 4 has an outer dimension of 101mm*161mm*21mm, and is mounted in the inner cavity of the reflecting cavity 3.

[0087] The heat insulation medium block 4 is used for heat insulation of the antenna and support of the radiation cover plate 1, and increases the reliability of the antenna structure.

[0088] The connector 5 is designed to be high-temperature resistant, the metal part is high-temperature alloy, and the medium is high-temperature resistant quartz material.

[0089] The end surface of the connector 5 is designed to be elastic contact, the inner elastic allowance is 0.6mm, and the outer diameter elastic design allowance is 0.3mm.

[0090] The end surface of the connector 5 is designed with a 1mm*45° cut surface on the side of the radiation circuit plating layer 2 and the matching circuit, so as to improve the electrical performance of the circuit connection.

[0091] The first pressing strip 6 is mounted on the outer four sides of the radiation cover plate 1, and the second pressing strip 7 is mounted on the inner four sides of the reflecting cavity 3 and is conformal with the curved surface.

[0092] The first pressing strip 6, the radiation cover plate 1, the radiation circuit plating layer 2, the reflecting cavity 3 and the second pressing strip 7 are fixed by screws, so as to form a conformal antenna.

[0093] The first pressing strip 6 is provided with two fixing ears for mounting the connector 5 on one side of the connector 5, the connector 5 passes through the through hole reserved in the front end of the reflecting cavity 3 and the radiation cover plate 1, is fixed with the fixing ear of the first pressing strip 6 by a screw, and meanwhile, the inner core of the connector 5 is electrically connected with the front end matching circuit of the radiation circuit plating layer 2.

[0094] In this embodiment, the first pressing strip 6 and the second pressing strip 7 are both made of high-temperature alloy, and are designed as curved conformal pressing strips, and there are three kinds of outer shape designs, and the outer dimensions are respectively 130mm*14mm*1.5mm, 130mm*194mm*1.5mm and 130mm*210mm*2mm, which are used for structural assembly and fixation between various structural parts of the antenna.

[0095] Compared with the prior art, the present application can at least realize one of the following beneficial effects:

[0096] (1) The present application can be applied to the surface conformal antenna of a high supersonic carrier platform with high surface temperature, enhances passive direction finding distance and effectiveness, and provides a radar with a large distance target detection capability.

[0097] (2) The present application adopts an electrical-structural-heat insulation integrated design, effectively solves the heat resistance problem of the conformal antenna, the antenna can be conformal to the surface of a missile body, and solves the problem of imbalance of the missile body matching caused by deep embedding.

[0098] (3) The design of the high-temperature resistant passive conformal antenna used in the present application can meet the design requirements of different temperatures and costs by changing the types of high-temperature metal plating, high-temperature alloy, high-temperature connector and other metal materials.

[0099] (4) The present application adopts an ultra-wideband slot antenna form, greatly improves the antenna gain, and improves the problem of backward radiation of the antenna.

[0100] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, 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 in the protection scope of the present application.

Claims

1. A high-temperature resistant passive conformal antenna, characterized in that, It includes a radiation cover plate (1), a radiation circuit coating (2), a reflective cavity (3), a heat insulation medium block (4), a connector (5), a first pressure strip (6) and a second pressure strip (7), which are arranged sequentially from top to bottom. The upper surface of the reflective cavity (3) is provided with a stepped inner cavity. The heat insulation medium block (4) is disposed in the inner cavity and is used for heat insulation of the antenna and support of the radiating cover plate (1). The heat insulation medium block (4) is conformal to the inner cavity. The heat insulation medium block (4) is stepped, similar to a "tower". The top of the heat insulation medium block (4) is the tip of the "tower" structure, and the bottom of the heat insulation medium block (4) is the bottom of the "tower" structure. The thickness of the heat insulation medium block (4) is in the direction of its depth in the reflective cavity (3). (4) The bottom thickness is greater than the top thickness; the end face of the connector (5) is provided with a cut surface, which is located on one side of the matching circuit between the radiation circuit plating (2) and the connector (5); the first pressure strip (6) and the second pressure strip (7) fix the four peripheries of the radiation cover plate (1), the radiation circuit plating (2) and the reflective cavity (3), the first pressure strip (6) and the second pressure strip (7) are conformal with the curved surface where the radiation cover plate (1), the radiation circuit plating (2) and the reflective cavity (3) are located, and the first pressure strip (6) and the second pressure strip (7) are both segmented structures.

2. The high-temperature resistant passive conformal antenna according to claim 1, characterized in that, The radiant cover (1) is made of quartz fiber.

3. The high-temperature resistant passive conformal antenna according to claim 1, characterized in that, The radiating circuit coating (2) is made of high-temperature metal and is attached to the inner side of the radiating cover plate (1).

4. The high-temperature resistant passive conformal antenna according to any one of claims 1-3, characterized in that, The reflective cavity (3) is made of heat-insulating tiles.

5. The high-temperature resistant passive conformal antenna according to claim 4, characterized in that, The surface of the inner cavity is coated with a high-temperature alloy metal.

6. The high-temperature resistant passive conformal antenna according to claim 1, characterized in that, The radiating circuit coating (2) is made of silver-palladium alloy.

7. The high-temperature resistant passive conformal antenna according to claim 1, characterized in that, The slit circuit of the radiation circuit coating (2) is an ultra-wideband radiation circuit.

8. The high-temperature resistant passive conformal antenna according to any one of claims 1-3 and 5-7, characterized in that, The high-temperature resistant passive conformal antenna operates in the frequency range of 2~18GHz.

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