A passive conformal antenna

Abstract

The application relates to a passive conformal antenna and belongs to the technical field of passive antennas, and solves the problem of imbalance of a projectile body caused by deep embedding in the prior art. The passive conformal antenna comprises a reflecting cavity, a heat-insulating medium block and a connector, the heat-insulating medium block is arranged in the reflecting cavity, and the connector is arranged on the lower surface of the reflecting cavity. The antenna can be conformal to the surface of the projectile body, and imbalance of the projectile body caused by deep embedding is avoided.

Description

TECHNICAL FIELD

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

[0002] The conventional single system anti-radiation seeker passive antenna is located at the front end of the missile body, and the antenna is protected by a dielectric antenna cover. Since the missile flight speed is not high and the cover protects against heat, the highest temperature of the passive antenna is only about 275 DEG C. The engineering plastics, metal materials and high-temperature solder of the passive antenna structure 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 hypersonic missiles have become an important direction of subsequent missile development.

[0004] The current hypersonic type under research and pre-research generally adopts a main and passive composite guidance system. In order to cope with the aerodynamic heating caused by hypersonic flight, the passive antenna adopts a conformal antenna form, and 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 in-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-temperature hypersonic platform. SUMMARY

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

[0007] The present application provides a passive conformal antenna, comprising a reflecting cavity, a thermal insulation medium block and a connector, the thermal insulation medium block is arranged in the reflecting cavity, and the connector is arranged on the lower surface of the reflecting cavity.

[0008] Further, the thermal insulation medium block is conformal to the reflecting cavity.

[0009] Further, the thermal insulation medium block is of a stepped type and is made of thermal insulation tiles.

[0010] Further, it further comprises a radiation circuit plating layer, and the radiation circuit plating layer is arranged on the upper surface of the reflecting cavity.

[0011] Further, the connector is electrically connected with the matching circuit of the radiation circuit plating layer.

[0012] Further, a radiation cover plate is arranged on the upper side of the radiation circuit plating layer, and the radiation cover plate and the reflection cavity are both provided with through holes.

[0013] Further, a first pressing strip is arranged on the upper side of the radiation cover plate, and one side of the first pressing strip is provided with two fixing lugs.

[0014] Further, the connector is connected by sequentially penetrating the through holes of the reflection cavity and the radiation cover plate and being fixed with the first pressing strip.

[0015] Further, the end surface of the connector is provided with a cutting surface, and the cutting surface is located on one side of the radiation circuit plating layer and the matching circuit of the connector.

[0016] Further, a second pressing strip is arranged on the lower side of the reflection cavity.

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

[0018] (1) The present application adopts electrical-structural-heat-resistant integrated design, effectively solves the problem of conformal antenna heat resistance, and the antenna can be conformal to the surface of the projectile, solving the problem of imbalance of projectile matching introduced by "deep burial".

[0019] (2) The present application can be applied to a surface conformal antenna of a hypersonic vehicle platform with high surface temperature, enhances the passive direction finding distance and effectiveness, and provides a radar with a large distance target detection capability.

[0020] (3) 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.

[0021] (4) The design of the passive conformal antenna used in the present application can meet the design needs of different temperatures and costs by changing the types of high-temperature metal plating, high-temperature alloy, high-temperature connector and other metal materials.

[0022] In the present application, the above technical solutions can also 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 application. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0024] Figure 1Exploded view of a passive conformal antenna according to a specific embodiment;

[0025] Figure 2 Front isometric view of a passive conformal antenna according to a specific embodiment;

[0026] Figure 3 Side view of a passive conformal antenna according to a specific embodiment;

[0027] Figure 4 Bottom view of a passive conformal antenna according to a specific embodiment;

[0028] Figure 5 Top view of a passive conformal antenna according to a specific embodiment.

[0029] Reference numerals:

[0030] 1 - Radiating cover plate; 2 - Radiating circuitry 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 herein below with reference to the accompanying 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 interpreted broadly, 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 passive conformal antenna, comprising a radiating cover plate 1, a radiating circuitry 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 passive conformal antenna works in a frequency range of 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 and conforms to the carrier platform.

[0041] 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.

[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 heat insulation tiles, 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 heat insulation tiles, the inner cavity surface of the reflection cavity 3 is a metal surface, and the high-temperature alloy metal coating process is used to realize the reflection cavity 3.

[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 in 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, so as to form a conformal antenna.

[0062] The first pressure strip 6 is located on one side of the connector 5 and has two fixing ears for mounting the connector 5. The connector 5 passes through the pre-reserved through hole at the front end of the reflective cavity 3 and the radiation cover plate 1 from below and is fixed to the fixing ears of the first pressure strip 6 by screws. At the same time, the inner core of the connector 5 is electrically connected to the front end matching circuit of the radiation circuit plating layer 2.

[0063] In this embodiment, both the first pressure strip 6 and the second pressure strip 7 are made of high-temperature alloy and are curved conformal design pressure strips used for structural assembly and fixation between various antenna structural components.

[0064] As another possibility in this embodiment, the first pressure strip 6 and the second pressure strip 7 are both segmented structures, which can reduce the overall weight of the antenna and save materials, and balance the stress, avoiding the mutual influence of stress when the first pressure strip 6 and the second pressure strip 7 are integral parts.

[0065] Example 2

[0066] Another specific embodiment of the present invention, such as Figures 1-5 As shown, a passive conformal antenna is disclosed, including a radiating cover plate 1, a radiating circuit coating layer 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.

[0067] The passive conformal antenna operates in the frequency range of 2–18 GHz.

[0068] The passive conformal antenna has external dimensions of 130mm*210mm*27mm.

[0069] The heat insulation medium block 4 is disposed inside the reflective cavity 3, the first pressure strip 6 is disposed above the radiation cover plate 1, the radiation cover plate 1 is disposed above the radiation circuit plating layer 2, the radiation circuit plating layer 2 is disposed above the reflective cavity 3, the second pressure strip 7 is disposed below the reflective cavity 3, and the connector 5 is disposed below the reflective cavity 3 and located in the inner region of the second pressure strip 7.

[0070] The radiation cover plate 1 is made of high-temperature resistant quartz fiber and has an external dimension of 130mm*10mm*2mm, conforming to the carrier platform.

[0071] The radiant cover plate 1 cooperates with the first pressure strip 6. The outer edge of the radiant cover plate 1 is provided with a step. The height of the step is the same as the thickness of the first pressure strip 6. Preferably, the height of the step is 1.5mm.

[0072] To ensure the thickness of the radiation cover plate 1 and facilitate the manufacturing process, the inner edge of the radiation cover plate 1 is provided with a step of the same height.

[0073] In this 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.

[0074] The radiation circuit plating layer 2 is made of silver-palladium alloy with high temperature resistance, and the outer dimension is 114mm*185*0.1mm.

[0075] In this 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.

[0076] The radiation circuit plating layer 2 is conformal with the radiation cover plate 1 and is arranged in the middle region of the inner side of the radiation cover plate 1.

[0077] The reflection cavity 3 is made of heat insulation tiles, and the outer dimension is 130mm*210mm*25mm.

[0078] The inner cavity surface of the reflection cavity 3 is a metal surface, and is realized by high-temperature alloy metal coating process.

[0079] In this embodiment, the inner cavity size is related to the antenna operating frequency band, and is of a stepped type.

[0080] In order to cooperate with the second pressing strip 7, the inner edge of the reflection cavity 3 is provided with a step with the same thickness as the second pressing strip 7,

[0081] Preferably, the step height is 1.5mm.

[0082] In this embodiment, the reflection cavity 3 is an arc-shaped plate, and the edge of the arc-shaped plate is provided with a mounting hole for connecting with the first pressing strip 6 and the second pressing strip 7.

[0083] The heat insulation medium block 4 is made of heat insulation tiles and is conformal with the inner cavity of the reflection cavity 3.

[0084] The outer dimension of the heat insulation medium block 4 is 101mm*161mm*21mm, and the heat insulation medium block 4 is arranged in the inner cavity of the reflection cavity 3.

[0085] 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.

[0086] The connector 5 is designed with high temperature resistance, the metal part is high-temperature alloy, and the medium is quartz material with high temperature resistance.

[0087] The end surface of the connector 5 is designed with elastic contact, wherein the inner core elastic allowance is 0.6mm, and the outer diameter elastic design allowance is 0.3mm.

[0088] The end surface of the connector 5 is designed with a 1mm*45° cut surface on the side of the radiation circuit plating 2 matched with the circuit, so as to improve the electrical performance of the circuit connection.

[0089] The first pressing strip 6 is installed on the outer four sides of the radiation cover plate 1, and the second pressing strip 7 is installed on the inner four sides of the reflection cavity 3 and conforms to the curved surface.

[0090] The first pressing strip 6, the radiation cover plate 1, the radiation circuit plating 2, the reflection cavity 3 and the second pressing strip 7 are fixed by screws on the four sides, so as to form a conformal antenna.

[0091] The first pressing strip 6 is provided with two fixing ears on one side of the connector 5, the connector 5 passes through the through hole reserved in the front end of the reflection cavity 3 and the radiation cover plate 1, and is fixed by screws through the fixing ears of the first pressing strip 6, and meanwhile, the inner core of the connector 5 is electrically connected with the front end matching circuit of the radiation circuit plating 2.

[0092] In the embodiment, the first pressing strip 6 and the second pressing strip 7 are 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 shape sizes are 130mm*14mm*1.5mm, 130mm*194mm*1.5mm and 130mm*210mm*2mm respectively, which are used for structural assembly and fixation between various structural parts of the antenna.

[0093] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0094] (1) The present application adopts electrical-structural-heat-resistant integrated design, effectively solves the problem of conformal antenna heat resistance, and the antenna can conform to the surface of the projectile, solving the problem of imbalance of the projectile matching caused by "deep burying".

[0095] (2) The present application can be applied to the surface conformal antenna of a hypersonic vehicle platform with high surface temperature, enhances the passive direction finding distance and effectiveness, and provides a radar with a large distance target detection capability.

[0096] (3) 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.

[0097] (4) The design of the 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 and high-temperature connector and other metal materials.

[0098] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A passive conformal antenna, characterized in that, The device includes a radiating cover plate (1), a radiating circuit coating (2), a reflective cavity (3), a heat-insulating medium block (4), and a connector (5). The heat-insulating medium block (4) is disposed inside the reflective cavity (3), and the connector (5) is disposed on the lower surface of the reflective cavity (3). The heat-insulating medium block (4) is conformal to the reflective cavity (3). The radiating circuit coating (2) is disposed on the upper surface of the reflective cavity (3) and attached to the inner side of the radiating cover plate (1). The slot circuit is an ultra-wideband radiating circuit. The inner cavity of the reflective cavity (3) is stepped. The heat-insulating 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 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). The thickness of the bottom of the heat insulation medium block (4) is greater than that of the top. The connector (5) has a cut surface on its end face, and the cut surface is located on one side of the radiating circuit plating layer (2) and the matching circuit of the connector (5).

2. The passive conformal antenna according to claim 1, characterized in that, The heat insulation medium block (4) is made of heat insulation tiles.

3. The passive conformal antenna according to claim 1, characterized in that, The connector (5) is electrically connected to the matching circuit of the radiating circuit coating (2).

4. The passive conformal antenna according to claim 1, characterized in that, The radiation cover plate (1) is located on the upper side of the radiation circuit coating (2), and both the radiation cover plate (1) and the reflective cavity (3) are provided with through holes.

5. The passive conformal antenna according to claim 4, characterized in that, It also includes a first pressure strip (6), which is located on the upper side of the radiation cover plate (1), and has two fixing ears on one side.

6. The passive conformal antenna according to claim 5, characterized in that, The connector (5) is connected to the first pressure strip (6) by passing through the through hole of the reflective cavity (3) and the radiation cover plate (1) in sequence.

7. The passive conformal antenna according to any one of claims 1-6, characterized in that, It also includes a second pressure strip (7), which is located on the lower side of the reflective cavity (3).

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