C-band conformal frequency-selective passive phased-array antenna

Abstract

The utility model belongs to the technical field of antennas, and provides a C-band conformal frequency selection passive phased array antenna, which comprises a passive phased array curved antenna, a frequency selection cover, a structure support piece, a co-curing foam layer and a radio frequency cable assembly, and is characterized in that the frequency selection cover and the passive phased array curved antenna are arranged at an interval and are arranged on the outer side of the passive phased array curved antenna; the structure supporting piece is connected with the passive phased array curved surface antenna; the co-curing foam layer wraps the passive phased array curved antenna, the frequency selection cover and the structure supporting piece; the radio frequency cable assembly is electrically connected with the passive phased array curved antenna and penetrates out of the co-curing foam layer. According to the utility model, the C-band communication is easy to realize, the scattering performance of the antenna is improved, the frequency selection cover and the curved surface antenna are highly integrated in a co-curing manner, the structure is compact, the relatively stable resonance bandwidth can be obtained, and the scattering performance of the antenna is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of antenna, concretely relates to a C waveband co -type frequency selection passive phased array antenna. BACKGROUND

[0002] At present, radar anti-detection technology mainly reduces the RCS by reducing or decreasing the detection echo of the enemy radar, avoids being detected by the enemy radar, and then achieves the goal of stealth. Radar stealth technology is widely used in aircrafts, and the main core point is to reduce the RCS scattering of the head of the target aircraft. The main method is to attach a layer of stealth material to the head of the aircraft. The stealth material is mainly used to absorb the electromagnetic wave of the enemy detection, reduce the reflection wave or scatter the incident wave to other directions in space, so that the enemy radar cannot determine the accurate position of the aircraft, and the effect of stealth is achieved. Based on the current situation of aircraft stealth, the research on stealth radome is carried out.

[0003] Frequency selective cover is an antenna cover with frequency selection ability, which is usually attached with frequency selective surface (FSS) on the surface of antenna cover medium or used as a sandwich layer between different media. FSS can effectively filter out useless frequency band signals and retain useful frequency band signals at both signal transmitting end and signal receiving end because it only resonates with electromagnetic waves at specific frequencies. This not only enhances the adaptability of signal transceiver devices to different application scenarios, but also reduces the risk of being interfered or even damaged by high-power signals.

[0004] Traditional frequency selective cover and antenna are fixed by screwing structure parts, which may reflect, scatter and absorb electromagnetic waves to some extent, possibly changing the electromagnetic field distribution around the antenna, affecting the radiation pattern, gain and other performance indicators of the antenna, leading to the decline of signal transmission quality, signal attenuation, distortion and other problems, and affecting the stability of resonant bandwidth. UTILITY MODEL CONTENTS

[0005] In view of the defects in the prior art, the utility model provides a C waveband co -type frequency selection passive phased array antenna to solve the problem that the traditional frequency selective cover and antenna are fixed by screwing structure parts, resulting in compact structure and affecting the stability of resonant bandwidth.

[0006] The C waveband co -type frequency selection passive phased array antenna provided by the utility model comprises:

[0007] A passive phased array curved surface antenna;

[0008] A frequency selective cover is arranged at the outer side of the passive phased array curved surface antenna.

[0009] a structural support, and the passive phased array curved surface antenna is connected with the structural support;

[0010] a co-cured foam layer, the passive phased array curved surface antenna, the frequency selective cover and the structural support are wrapped in the co-cured foam layer;

[0011] a radio frequency cable assembly, and the passive phased array curved surface antenna is electrically connected with the radio frequency cable assembly and passes out of the co-cured foam layer to the outside.

[0012] According to the technical scheme, the C-band co-molded frequency selective passive phased array antenna provided by the utility model,

[0013] Optionally, the co-cured foam layer comprises:

[0014] a first wave-transparent foam layer, which is arranged on the outside of the frequency selective cover;

[0015] a second wave-transparent foam layer, which wraps the passive phased array curved surface antenna and the structural support in the second wave-transparent foam layer;

[0016] a first wave-absorbing layer, which is arranged on the outer surface of the second wave-transparent foam layer.

[0017] Optionally, the passive phased array curved surface antenna comprises:

[0018] a metal backing plate, wherein a first groove is arranged on the metal backing plate;

[0019] a second wave-absorbing layer, which is filled in the first groove;

[0020] a curved surface antenna, which is arranged on the second wave-absorbing layer;

[0021] an SMA connector, one end of the SMA connector passes through the metal backing plate, the second wave-absorbing layer and the curved surface antenna layer and is electrically connected with the curved surface antenna, and the other end is electrically connected with the radio frequency cable assembly.

[0022] Optionally, the structural support comprises:

[0023] a backing plate connecting portion, which is connected with the metal backing plate;

[0024] a reinforcing portion, which is arranged in the backing plate connecting portion and is spaced apart from the backing plate connecting portion, and a through hole is arranged on the reinforcing portion;

[0025] an external connecting portion, which is arranged in the reinforcing portion and is spaced apart from the reinforcing portion, and a second groove is arranged on the external connecting portion;

[0026] the backing plate connecting portion and the reinforcing portion and the reinforcing portion and the external connecting portion are connected through connecting ribs.

[0027] Optionally, the SMA connector is arranged in two rows in an interlaced manner.

[0028] Optionally, the first wave-transparent foam layer, the second wave-transparent foam layer, the first wave-absorbing layer, and the second wave-absorbing layer are all made of PMI foam material.

[0029] By adopting the above technical solution, this application has the following technical effects:

[0030] Based on the above structure, the passive phased array curved antenna, frequency selective radome, and structural support are located inside the co-cured foam layer and are fixed together as a whole through co-curing. Compared with the traditional method of fixing the frequency selective radome and antenna by screwing the structural components, this not only makes it easier to achieve C-band communication and improve its scattering performance, but also highly integrates the frequency selective radome and curved antenna through co-curing, resulting in a compact structure that can obtain a relatively stable resonant bandwidth and achieve the antenna's scattering performance. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0032] Figure 1 A schematic diagram of a C-band conformal frequency-selective passive phased array antenna provided for an embodiment of this utility model;

[0033] Figure 2 Another schematic diagram of a C-band conformal frequency-selective passive phased array antenna provided in this embodiment of the present invention;

[0034] Figure 3 A schematic diagram of removing the co-cured foam layer in a C-band conformal frequency-selective passive phased array antenna provided for an embodiment of this utility model;

[0035] Figure 4 An exploded view of the passive phased array curved antenna provided in this embodiment of the utility model;

[0036] Figure 5 A schematic diagram of a passive phased array curved antenna provided for an embodiment of this utility model;

[0037] Figure 6 for Figure 5 BB direction sectional view.

[0038] Figure label:

[0039] 1- Passive phased array curved antenna; 11- Metal backing plate; 12- Second absorbing layer; 13- Curved antenna; 14- SMA connector; 2- Frequency selective cover; 3- Structural support; 31- Backing plate connection part; 32- Reinforcing part; 321- Through hole; 33- External connection part; 331- Second groove; 41- First wave-transparent foam layer; 42- Second wave-transparent foam layer; 43- First absorbing layer; 5- Radio frequency cable assembly. Detailed Implementation

[0040] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0041] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] like Figures 1-3As shown, a C-band conformal frequency-selective passive phased array antenna is provided, comprising a passive phased array curved antenna 1, a frequency-selective cover 2, a structural support 3, a co-cured foam layer 4, and an RF cable assembly 5. The frequency-selective cover 2 and the passive phased array curved antenna 1 are spaced apart and disposed on the outside of the passive phased array curved antenna 1; the structural support 3 is connected to the passive phased array curved antenna 1; the co-cured foam layer 4 encloses the passive phased array curved antenna 1, the frequency-selective cover 2, and the structural support 3; the RF cable assembly 5 is electrically connected to the passive phased array curved antenna 1 and extends out from the co-cured foam layer 4 to the outside.

[0046] Based on the above structure, the passive phased array curved antenna 1, the frequency selective radome 2, and the structural support 3 are located inside the co-cured foam layer 4 and are fixed together as a whole through co-curing. Compared with the traditional method of fixing the frequency selective radome and antenna by screwing the structural components, the solution provided in this embodiment not only makes it easier to solve the problem of C-band communication and improves its own scattering performance, but also highly integrates the frequency selective radome and the curved antenna through co-curing, resulting in a compact structure, a relatively stable resonant bandwidth, and improved antenna scattering performance.

[0047] like Figures 1-2 As shown, the co-cured foam layer 4 includes a first wave-transparent foam layer 41, a second wave-transparent foam layer 42, and a first wave-absorbing layer 43. The first wave-transparent foam layer 41 is disposed on the outside of the frequency selective cover; the second wave-transparent foam layer 42 encloses the passive phased array curved antenna 1 and the structural support member 3 inside; and the first wave-absorbing layer 43 is disposed on the outer surface of the second wave-transparent foam layer 42.

[0048] In actual production, the passive phased array curved antenna 1, frequency selective cover 2, structural support and radio frequency cable assembly are wrapped inside the co-cured foam layer 4 by adhesive bonding. Then, the larger gaps inside are filled by polyurethane foaming process to form a whole. The outer surface of the second wave-transparent foam layer 42 is reserved for processing. Finally, after machining into the required shape, the first wave-absorbing layer 43 is co-cured at the corresponding position of the second wave-transparent foam layer 42.

[0049] like Figure 1 As shown, the first wave-transparent foam layer 41 is set according to the included angle A, which is determined according to the radiation angle required in actual use, without any specific limitation.

[0050] like Figures 4-6As shown, the passive phased array curved antenna 1 includes a metal backing plate 11, a second absorbing layer 12, a curved antenna 13, and an SMA connector 14. A first groove is provided on the metal backing plate 11; the second absorbing layer 12 fills the first groove; the curved antenna 13 is disposed on the outside of the second absorbing layer 12 and is welded to the metal backing plate 11 on all sides; one end of the SMA connector 14 passes through the metal backing plate 11, the second absorbing layer 12, and the curved antenna 13, and is electrically connected to the curved antenna 13 and welded and fixed, and the other end is electrically connected to the radio frequency cable assembly 5.

[0051] like Figure 3 As shown, structural support member 3 includes:

[0052] The liner connecting part 31 is connected to the metal liner 11.

[0053] The reinforcing part 32 and the liner connecting part 31 are spaced apart, and the reinforcing part has a through hole 321; the radio frequency cable assembly 5 passes through the through hole 321.

[0054] The outer part 33 and the reinforcing part 32 are spaced apart, and the outer part 33 has a second groove 331.

[0055] The liner connecting part 31 and the reinforcing part 32, and the reinforcing part 32 and the outer connecting part 33 are connected by connecting ribs 34.

[0056] like Figure 3 As shown, the SMA connectors 14 are arranged in two staggered rows. The SMA connectors 14 are specifically fixed to the metal backing plate 11 by screwing.

[0057] Optionally, the RF cable assembly 5 includes an RF coaxial cable and an adapter plate, with one end of the RF coaxial cable extending out of the co-cured foam layer 4 and connecting to the adapter plate disposed on the outside.

[0058] Optionally, the first wave-transparent foam layer 41, the second wave-transparent foam layer 42, the first wave-absorbing layer 43, and the second wave-absorbing layer 12 are all made of PMI foam material.

[0059] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A C-band conformal frequency-selective passive phased-array antenna, characterized in that, The application relates to a passive phased array curved surface antenna. A frequency selective cover is arranged outside the passive phased array curved surface antenna. A structural support is connected to the passive phased array curved surface antenna. A co-cured foam layer is arranged inside the passive phased array curved surface antenna, the frequency selective cover and the structural support. A radio frequency cable assembly is electrically connected to the passive phased array curved surface antenna and extends out of the co-cured foam layer. The co-cured foam layer comprises:

2. The C-band co-type frequency selective passive phased array antenna according to claim 1, wherein, A first wave-transparent foam layer is arranged outside the frequency selective cover. A second wave-transparent foam layer is arranged inside the passive phased array curved surface antenna and the structural support. A first wave-absorbing layer is arranged on the outer surface of the second wave-transparent foam layer. The passive phased array curved surface antenna comprises:

3. The C-band co-type frequency selective passive phased array antenna according to claim 2, wherein, A metal backing plate is provided with a first groove. A second wave-absorbing layer is filled in the first groove. A curved surface antenna is arranged on the second wave-absorbing layer. An SMA connector is electrically connected to the curved surface antenna at one end and to the radio frequency cable assembly at the other end. The structural support comprises:

4. The C-band co-type frequency selective passive phased array antenna according to claim 3, wherein, A backing plate connecting part is connected to the metal backing plate. A reinforcing part is arranged outside the backing plate connecting part and is provided with a through hole. An external connecting part is arranged outside the reinforcing part and is provided with a second groove. The backing plate connecting part and the reinforcing part and the reinforcing part and the external connecting part are connected by connecting ribs. The SMA connectors are arranged in two rows.

5. The C-band co-type frequency selective passive phased array antenna according to claim 3, wherein, The first wave-transparent foam layer, the second wave-transparent foam layer, the first wave-absorbing layer and the second wave-absorbing layer are all made of PMI foam material.

6. The C-band co-type frequency selective passive phased array antenna according to claim 3, wherein, ​

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