CN111355034B

CN111355034B - Dual-passband wave-transmitting structure with wave absorbing function

Info

Publication number: CN111355034B
Application number: CN202010195231.8A
Authority: CN
Inventors: 车永星; 卢澜; 李浩彤; 袁晓峰
Original assignee: Beijing Institute of Environmental Features
Current assignee: Beijing Institute of Environmental Features
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2022-05-24
Anticipated expiration: 2040-03-19
Also published as: CN111355034A

Abstract

The invention relates to a dual-passband wave-transmitting structure with a wave-absorbing function, which comprises a skin layer, a foam layer, a loss layer and an FSS layer, wherein the skin layer, the loss layer, the skin layer, the foam layer, the skin layer, a frequency selection surface layer and the skin layer are sequentially arranged from top to bottom, and are bonded together.

Description

Dual-passband wave-transmitting structure with wave absorbing function

Technical Field

The invention relates to the technical field of radar wave transmission, in particular to a dual-passband wave transmission structure with a wave absorbing function.

Background

On various weaponry equipped with radar sensor, all improve radar system's low detectability through the antenna house that constitutes by special radar wave-transparent structure. Traditional radar wave-transparent structure does not possess low detectability, and traditional radar wave-absorbing structure is though having obvious effect to the low detectability improvement of radar, but traditional radar wave-absorbing structure is unsuitable to be applied to the antenna house.

The traditional radar wave-absorbing structure mainly comprises impedance layers and metal substrates which are arranged at intervals of dielectric layers, and the Salisbury screen mainly comprises a single-layer impedance layer at present, so that the wave-absorbing characteristic can be realized only at a single resonance frequency point; the Jaumann wave-absorbing structure formed by the multiple impedance layers can realize the wave-absorbing characteristics of multiple resonance frequency points through the superposition of the impedance layers, and the wave-absorbing bandwidth is expanded; the wave-absorbing structure formed by the impedance film etched with the units or the circuit layer loaded with the lumped elements can have broadband radar wave-absorbing characteristics in a thinner structure thickness. However, the substrate of the radar wave-absorbing structure is completely covered by the metal layer, and due to the existence of the metal layer, the wave-absorbing structure is not suitable for being used as a structure of an antenna housing.

The current Ku and Ka dual-passband wave-transmitting structure is realized by applying a Frequency Selective Surface (FSS) technology, namely the structure is formed by metal unit array films with spaced dielectric layers, the characteristics of transmitting waves at the radar working waveband and reflecting electromagnetic waves of other wavebands can be obtained, the out-of-band low detectable characteristic is obtained by shape design, and the structure forming the antenna housing does not have the wave absorption characteristic. The low detectivity of such radomes is insufficient due to factors such as aerodynamic shape.

Therefore, in order to overcome the above disadvantages, a dual-passband wave-transmitting structure with a wave-absorbing function is required.

Disclosure of Invention

Technical problem to be solved

The invention aims to solve the technical problem that the existing radar wave-absorbing structure is not suitable for an antenna housing and an FSS antenna housing with Ku and Ka frequency band wave-transmitting performance and has poor low detectability.

(II) technical scheme

In order to solve the technical problem, the invention provides a dual-passband wave-transmitting structure with a wave-absorbing function, which comprises a skin layer, a foam layer, a loss layer and an FSS layer, wherein the skin layer, the loss layer, the skin layer, the foam layer, the skin layer, a frequency selection surface layer and the skin layer are sequentially arranged from top to bottom, and the layers are bonded together.

As a further description of the present invention, it is preferable that the lossy layer is formed of a plurality of lossy layer basic units arranged in a two-dimensional plane in a repeating manner with a cross period, and a strong absorption property to out-of-band electromagnetic waves is realized by a close arrangement of the lossy layer units.

As a further description of the present invention, preferably, the loss layer basic unit is a three-pole metal patch welded with a resistor, a line width of each dipole in the three-pole metal patch is W1, a side length is W2, an included angle between the dipole and the three-pole metal patch is 120 °, a resistance value of the resistor is r, a value range of W1 is 0.1-0.2 mm, a value range of W2 is 5-10 mm, and a value range of r is 200-300 Ω, so that miniaturization of the structure is achieved, and a wave absorbing function is achieved in a low frequency band.

As a further description of the present invention, preferably, two loss layer basic units are spliced together to form a loss layer array unit with R1 as a center distance, wherein the value range of R1 is 5-10 mm.

As a further description of the present invention, it is preferable that the lossy layer array unit has a vertical arrangement period of D1 and a horizontal arrangement period of D2 to form a lossy layer array, where D1 has a value range of 10-15 mm, and D2 has a value range of 15-20 mm.

As a further description of the present invention, it is preferable that the FSS layer is formed of basic units of FSS layers arranged in a two-dimensional plane with a repeating cross period, and that the interaction of electromagnetic waves exhibits the properties of transmitting waves in Ku and Ka bands and reflecting electromagnetic waves in low frequency bands.

As a further description of the invention, preferably, two FSS layer basic units are spliced together to form an FSS layer array unit by taking R2 as a center distance, wherein the value range of R2 is 5-10 mm.

As a further description of the present invention, it is preferable that the FSS layer array unit forms the FSS layer array with a vertical arrangement period of D3 and a horizontal arrangement period of D4, wherein a value range of D3 is 5-10 mm, and a value range of D4 is 10-15 mm.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

according to the invention, the wave-transmitting FSS layer in Ku and Ka frequency bands and the FSS layer reflected in other frequency bands are organically combined with the loss layer with wave-absorbing characteristics in other frequency bands in a frequency domain, so that the dual functions of low-frequency band wave-absorbing and Ku and Ka frequency band wave-transmitting can be realized simultaneously, out-of-band wave-absorbing is realized on the Ku and Ka band wave-transmitting structure, the normal work of a Ku and Ka band radar system is ensured, the out-of-band radar scattering cross section is reduced, and out-of-band scattering is inhibited. Meanwhile, the wave-transmitting structure comprises multiple layers of glass fiber reinforced plastic material layers, and is suitable for high-strength working environments.

Drawings

FIG. 1 is a cross-sectional structure diagram of a dual-passband wave-transmitting structure of the present invention;

FIG. 2 is a diagram of the basic cell structure of the lossy layer of the present invention;

FIG. 3 is a block diagram of a lossy layer array element of the invention;

FIG. 4 is a diagram of a lossy layer array structure of the present invention;

FIG. 5 is a diagram of the basic unit structure of the FSS layer of the present invention;

FIG. 6 is a diagram of an FSS layer array element structure of the present invention;

FIG. 7 is a diagram of an FSS layer array architecture of the present invention;

fig. 8 is a schematic diagram of the wave-transmitting/reflecting performance of the dual-passband wave-transmitting structure of the present invention.

In the figure: 1. a skin layer; 2. a foam layer; 3. a lossy layer; 31. a lossy layer basic cell; 32. a lossy layer array unit; 33. an array of lossy layers; 4. an FSS layer; 41. an FSS layer basic unit; 42. an FSS layer array unit; 43. an FSS layer array; 5. a metal unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The utility model provides a bi-pass band wave-transparent structure with inhale ripples function, as shown in figure 1, including skin layer 1, foam blanket 2, loss layer 3 and frequency selection superficial layer 4, radar wave-absorbing structure is multilayer structure, down is skin layer 1, loss layer 3, skin layer 1, foam blanket 2, skin layer 1, frequency selection superficial layer 4 and skin layer 1 from the last in proper order, bonds between each layer and is in the same place.

With reference to fig. 1 to 4, the skin layer 1 is made of glass fiber material. The foam layer 2 is made of foam plate materials, the loss layer 3 is made of loss layer basic units 31 which are arranged in a two-dimensional plane in a crossed periodic repeated mode, the two loss layer basic units 31 are spliced together by taking R1 as a center distance to form a loss layer array unit 32, and the value range of R1 is 5-10 mm; the lossy layer array unit 32 forms a lossy layer array 33 with a vertical arrangement period of D1 and a horizontal arrangement period of D2, wherein the value range of D1 is 10-15 mm, and the value range of D2 is 15-20 mm. The loss layer basic unit 31 is a three-pole metal patch welded with the resistor device 5, the line width of each dipole in the three-pole metal patch is W1, the side length is W2, the mutual included angle is 120 degrees, the resistance value of the resistor device 5 is r, the value range of W1 is 0.1-0.2 mm, the value range of W2 is 5-10 mm, and the value range of r is 200-300 omega, and through the size setting, the miniaturization of the structure can be realized, and the wave absorbing function is realized in a specific frequency band; through the arrangement, the loss layer 3 becomes a resistance type frequency selection surface, and the parameters of the loading resistor of the layer are changed, so that the wave absorbing characteristic of a specific frequency band can be influenced.

With reference to fig. 5 to 7, the frequency selective surface layer 4 is formed by FSS layer basic units 41 which are arranged in a two-dimensional plane in a crossed periodic and repeated manner, and two FSS layer basic units 41 are spliced together to form an FSS layer array unit 42 by taking R2 as a central distance, wherein the value range of R2 is 5-10 mm; the FSS layer array units 42 form an FSS layer array 43 with the arrangement period in the vertical direction being D3 and the arrangement period in the horizontal direction being D4, wherein the value range of D3 is 5-10 mm, and the value range of D4 is 10-15 mm; the FSS basic unit 41 is an internal and external nested regular hexagon, the side length of the external hexagon is L1, the side length of the internal hexagon is L2, the value range of L1 is 2-3 mm, and the value range of L2 is 1-2 mm; small fractal hexagons are arranged at the hexagonal ends of the FSS basic unit 41, the side length of each small fractal hexagon is L3, and the value range of L3 is 0.3-0.6 mm; hexagonal annular slits are formed in the outer hexagon, the inner hexagon and the small fractal hexagon of the FSS basic unit 41, the widths of the gaps of the outer hexagon and the small fractal hexagonal ring are W3, the width of the gap of the inner hexagonal ring is W4, and the value ranges of W3 and W4 are 0.1-0.3 mm.

With reference to fig. 1 and 8, when the wave-transparent structure of the present invention is used, electromagnetic wave signals with various frequencies enter from the outer side of the uppermost skin layer 1, sequentially pass through the wave-absorbing structure formed by combining the skin layer 1 and the loss layer 3, the skin layer 1, the foam layer 2, and the frequency-filtering structure formed by combining the skin layer 1 and the frequency-selective surface layer 4. The wave absorbing structure formed by combining the skin layer 1 and the loss layer 3 absorbs electromagnetic wave signals reflected by the frequency selective surface, the frequency selective structure performs frequency selective filtering on the incident electromagnetic wave signals, reflects the electromagnetic wave signals outside Ku and Ka frequency bands, selects the electromagnetic waves of the Ku and Ka frequency bands to pass through, and finally realizes that only the electromagnetic wave signals of the Ku and Ka frequency bands are output by the lowest skin layer 1 through creative structural design and hundreds of experimental corrections.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a bi-pass band wave-transparent structure with inhale wave function which characterized in that: the self-adhesive energy-saving foam concrete comprises a skin layer (1), a foam layer (2), a loss layer (3) and an FSS layer (4), wherein the skin layer (1), the loss layer (3), the skin layer (1), the foam layer (2), the skin layer (1), the FSS layer (4) and the skin layer (1) are sequentially arranged from top to bottom, and all the layers are bonded together; the three-pole metal patch is characterized in that the loss layer (3) is composed of loss layer basic units (31) which are arranged in a two-dimensional plane in a crossed periodic and repeated mode, the loss layer basic units (31) are three-pole metal patches welded with resistor devices (5), three dipoles of the three-pole metal patches converge at one point, the three resistor devices (5) are respectively welded on each dipole of the three-pole metal patches, the line width of each dipole in each three-pole metal patch is W1, the side length is W2, the mutual included angle is 120 degrees, the resistance value of the resistor device (5) is r, the value range of W1 is 0.1-0.2 mm, the value range of W2 is 5-10 mm, and the value range of r is 200-300 omega; the FSS layer (4) is formed by FSS layer basic units (41) which are arranged in a two-dimensional plane in a crossed periodic and repeated mode, the FSS layer basic units (41) are regular hexagonal grooves which are nested inside and outside, and small fractal hexagonal grooves are formed in hexagonal ends of the FSS layer basic units (41).

2. The dual-passband wave-transmitting structure with the wave absorbing function of claim 1, which is characterized in that: the two loss layer basic units (31) are spliced together to form a loss layer array unit (32) by taking R1 as the center distance, wherein the value range of R1 is 5-10 mm.

3. The dual-passband wave-transmitting structure with the wave absorbing function of claim 2, which is characterized in that: the loss layer array unit (32) forms a loss layer array (33) with a vertical arrangement period of D1 and a horizontal arrangement period of D2, wherein the value range of D1 is 10-15 mm, and the value range of D2 is 15-20 mm.

4. The dual-passband wave-transmitting structure with the wave absorbing function of claim 1, which is characterized in that: the two FSS layer basic units (41) are spliced together by taking R2 as a center distance to form an FSS layer array unit (42), wherein the value range of R2 is 5-10 mm.

5. The dual passband wave-transmitting structure with the wave absorbing function of claim 4, wherein: the FSS layer array unit (42) forms an FSS layer array (43) with the arrangement period in the vertical direction being D3 and the arrangement period in the horizontal direction being D4, wherein the value range of D3 is 5-10 mm, and the value range of D4 is 10-15 mm.