阅读说明：本技术 一种X、Ku双频段透波的频率选择结构 (Frequency selection structure for X, Ku dual-band transmission ) 是由 车永星 聂文君 卢澜 王登琦 袁晓峰 于 2021-01-04 设计创作，主要内容包括：本发明涉及一种X、Ku双频段透波的频率选择结构,所述频率选择结构包括：蒙皮层(1)和频率选择表面层(2),从上往下依次为蒙皮层(1)、频率选择表面层(2)和蒙皮层(1),频率选择表面层(2)在二维平面内交叉周期重复排列的金属单元(3)构成。本发明解决了以往X、Ku频段透波天线罩在工作频段透波性能随角度和极化敏感的问题,可实现X、Ku双频段的透波功能,提高天线罩的透波性能。(The invention relates to a frequency selective structure of X, Ku dual-band transmission, which comprises: the mask layer (1) and the frequency selective surface layer (2) are sequentially the mask layer (1), the frequency selective surface layer (2) and the mask layer (1) from top to bottom, and the frequency selective surface layer (2) is composed of metal units (3) which are arranged in a two-dimensional plane in a crossed periodic and repeated mode. The invention solves the problem that the wave-transmitting performance of the conventional X, Ku frequency band wave-transmitting radome is sensitive along with angle and polarization in a working frequency band, can realize the wave-transmitting function of X, Ku double frequency bands, and improves the wave-transmitting performance of the radome.)

1. An X, Ku dual-band transmission frequency selective structure, comprising: the structure includes skin layer (1) and frequency selective surface layer (2), skin layer (1) includes last skin layer (11) and lower skin layer (12), frequency selective surface layer (2) are located between last skin layer (11) and lower skin layer (12), bond together between each layer.

2. The frequency selective architecture of claim 1, wherein: the upper skin layer (11) and the lower skin layer (12) are made of glass fiber materials.

3. The frequency selective architecture of claim 1, wherein: the upper skin layer (11) and the lower skin layer (12) independently have a thickness of 0.2mm to 0.5 mm.

4. The frequency selective architecture of claim 1, wherein: the frequency selective surface layer (2) is composed of metal units (3) which are arranged in a two-dimensional plane in a crossed periodic and repeated mode.

5. The frequency selective architecture of claim 1, wherein: the metal unit (3) is composed of a three-level sub-ring gap and a circular ring gap etched on a metal film.

6. The frequency selective architecture of claim 1, wherein: the metal units (3) are repeatedly arranged in a crossing period mode, two adjacent metal units (3) are spliced together to form an array unit (4) by taking R as the center distance of a three-level sub-ring gap, the arrangement period of the array unit (4) in the vertical direction is D1, and the arrangement period in the horizontal direction is D2 to form a frequency selection surface layer array (5).

7. The frequency selective architecture of claim 1, wherein: the value range of R is 2mm-4mm, the value range of D1 is 2mm-4mm, and the value range of D2 is 5mm-7 mm.

8. The frequency selective architecture of claim 1, wherein: in the frequency selection surface layer metal unit (3), the length of the long side of the three-level sub-ring gap is L1, the mutual included angle between two adjacent long sides is 120 degrees, the length of the short side of the three-level sub-ring gap is L2, the gap width is W1, the outer radius of the circular ring gap is R1, and the width of the circular ring gap is W2.

9. The frequency selective architecture of claim 1, wherein: the value range of L1 is 0.8mm-1.5mm, the value range of L2 is 0.4mm-1mm, the value range of W1 is 0.1mm-0.4mm, the value range of R1 is 0.6mm-1.2mm, and the value range of W2 is 0.1mm-0.4 mm.

10. Use of a frequency selective structure according to any one of claims 1 to 9 in a radar system.

Technical Field

The invention relates to the technical field of frequency selective surface structures, in particular to a frequency selective structure of X, Ku dual-band transmission.

Background

The frequency selective surface structure has an obvious effect on the suppression of electromagnetic scattering of the radar antenna. On all kinds of platforms of installing radar sensor, all improve radar system's low detectability through special frequency selective surface structure antenna house, the wave-transparent performance of monosequency section is often only considered to traditional antenna house, and in present novel radar, often install the communication antenna of two frequency channels, therefore its supporting antenna house should guarantee good passband characteristic in these two frequency channels.

Current dual-band radomes are implemented by applying ultra-wideband wave-transparent composite structures or Frequency Selective Surface (FSS) technology. The ultra-wideband wave-transmitting composite structure is made of a dielectric material, has serious deterioration of transmission performance under the condition of large-angle irradiation of electromagnetic waves, and is not suitable for application under the condition of large-angle incidence of the electromagnetic waves. The structure applying the frequency selective surface technology is formed by metal unit array films with medium layers separated, and good electromagnetic wave transmission characteristics are kept on two frequency bands required by an antenna system. The current method for realizing the dual-band wave-transparent frequency selection structure mainly comprises the following steps: multi-layer FSS cascades, mixed arrangements of different frequency cells, concentric ring cells, and the like.

Disclosure of Invention

Technical problem to be solved

The technical problem to be solved by the invention is that the wave-transmitting performance of the existing radome which works at the X, Ku frequency band simultaneously is sensitive along with angle and polarization.

(II) technical scheme

In order to solve the above technical problems, the present invention provides in a first aspect an X, Ku dual-band transmission frequency selective structure, comprising a skin layer 1 and a frequency selective surface layer 2, wherein the skin layer 1 comprises an upper skin layer 11 and a lower skin layer 12, the frequency selective surface layer 2 is located between the upper skin layer 11 and the lower skin layer 12, and the layers are bonded together.

Preferably, the upper skin layer 11 and the lower skin layer 12 are glass fiber materials.

Preferably, the upper skin layer 11 and the lower skin layer 12 independently have a thickness of 0.2mm to 0.5 mm.

Preferably, the frequency selective surface layer 2 is composed of metal units 3 arranged repeatedly with a period intersecting in a two-dimensional plane.

Preferably, the metal unit 3 is formed by etching a third-level sub-ring gap and a circular ring gap on a metal film.

Preferably, the metal units 3 are arranged in a repeated way with a crossing period, two adjacent metal units 3 are spliced together to form an array unit 4 with R as the center distance of the three-level sub-ring gap, the array unit 4 has an arrangement period D1 in the vertical direction and an arrangement period D2 in the horizontal direction to form the frequency selective surface layer 5.

Preferably, the value range of R is 2mm-4mm, the value range of D1 is 2mm-4mm, and the value range of D2 is 5mm-7 mm.

Preferably, in the frequency selective surface layer metal unit 3, the length of the long side of the tertiary sub-ring slit is L1, the mutual included angle between two adjacent long sides is 120 °, the length of the short side of the tertiary sub-ring slit is L2, the slit width is W1, the outer radius of the circular slit is R1, and the slit width of the circular slit is W2.

Preferably, the value range of L1 is 0.8mm-1.5mm, the value range of L2 is 0.4mm-1mm, the value range of W1 is 0.1mm-0.4mm, the value range of R1 is 0.6mm-1.2mm, and the value range of W2 is 0.1mm-0.4 mm.

A second aspect of the invention provides a use of the frequency selective structure of the first aspect of the invention in a radar system.

(III) advantageous effects

The technical scheme of the invention has the following advantages:

(1) when the frequency selection structure of X, Ku dual-band transmission provided by the invention is used, electromagnetic wave signals of various frequencies pass through a frequency filter structure formed by combining the skin layer 1 and the frequency selection surface layer 2 together. The frequency selective structure performs frequency selective filtering on the incident electromagnetic wave signal, reflects the electromagnetic wave signal outside the X, Ku frequency band, selects the X, Ku frequency band electromagnetic wave to pass through, and finally outputs only the X, Ku frequency band electromagnetic wave signal from the lowest skin layer 1.

(2) The X, Ku dual-band wave-transmitting structure provided by the invention can realize dual functions of band-pass of X, Ku frequency band and band-stop of other frequency bands, ensures that a radar system of the radome with the dual-band wave-transmitting structure can normally work on two frequency bands at the same time, has good electromagnetic wave-transmitting characteristic, and can ensure that electronic equipment in the radome can normally work. Meanwhile, the radar system structure with the dual-band wave-transparent structure antenna housing comprises multiple layers of glass fiber reinforced plastic material layers, and is suitable for a high-strength working environment.

(3) The X, Ku dual-band wave-transmitting structure provided by the invention solves the problem that the wave-transmitting performance of the existing antenna cover working at the X, Ku frequency band is sensitive along with angle and polarization, and improves the transmission stability of large-angle incident electromagnetic waves.

Drawings

FIG. 1 is a block diagram of a frequency selective structure of the X, Ku dual band transmission of the present invention;

FIG. 2 is a frequency selective surface layer structure diagram of the frequency selective structure of the X, Ku dual band transmission of the present invention;

FIG. 3 is a schematic diagram of the vertically polarized wave transmission of the frequency selective structure of the X, Ku dual-band transmission of the present invention; wherein a represents an incident angle of 0 °, b represents an incident angle of 30 °, and c represents an incident angle of 60 °;

FIG. 4 is a schematic illustration of the horizontally polarized wave transmission of the frequency selective structure of the X, Ku dual band transmission of the present invention; wherein a represents an incident angle of 0 °, b represents an incident angle of 30 °, and c represents an incident angle of 60 °;

wherein: 1. skin layer, 2, frequency selective surface layer (FSS layer), 3, FSS metal unit, 4, FSS array unit, 5, FSS array.

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 invention provides a frequency selection structure of X, Ku dual-band transmission, which comprises a skin layer 1 and a frequency selection surface layer 2, wherein the skin layer 1 comprises an upper skin layer 11 and a lower skin layer 12, the frequency selection surface layer 2 is positioned between the upper skin layer 11 and the lower skin layer 12, and the layers are bonded together.

According to some preferred embodiments, the upper skin layer 11 and the lower skin layer 12 are fiberglass materials.

According to some preferred embodiments, the upper skin layer 11 and the lower skin layer 12 independently have a thickness of 0.2mm to 0.5 mm.

As shown in fig. 2, the frequency selective surface layer 2 is composed of FSS metal units 3 arranged repeatedly with a period of intersection in a two-dimensional plane.

As shown in fig. 2, the FSS metal unit 3 is formed by etching a three-level sub-ring slit and a circular ring slit on a metal film.

As shown in fig. 2, the FSS metal units 3 are arranged in a repeated crossing period manner, two adjacent FSS metal units 3 are spliced together to form an FSS array unit 4 with R as the center distance of the three-level sub-ring gap, the FSS array unit 4 has an arrangement period D1 in the vertical direction and an arrangement period D2 in the horizontal direction to form an FSS layer array 5.

Wherein the value range of R is 2mm-4mm, the value range of D1 is 2mm-4mm, and the value range of D2 is 5mm-7 mm.

As shown in fig. 2, in the FSS layer metal unit 3, the length of the long side of the tertiary sub-ring slit is L1, the included angle between two adjacent long sides is 120 °, the length of the short side of the tertiary sub-ring slit is L2, the slit width is W1, the outer radius of the circular slit is R1, and the width of the circular slit is W2.

Wherein the value range of L1 is 0.8mm-1.5mm, the value range of L2 is 0.4mm-1mm, the value range of W1 is 0.1mm-0.4mm, the value range of R1 is 0.6mm-1.2mm, and the value range of W2 is 0.1mm-0.4 mm.

In use, with reference to fig. 1 and 3, the frequency selective structure of X, Ku dual-band transmission, electromagnetic wave signals of various frequencies pass through a frequency filter structure formed by the combination of the skin layer 1 and the frequency selective surface layer 2. The frequency selective structure carries out frequency selective filtering on the incident electromagnetic wave signals, reflects the electromagnetic wave signals out of the X, Ku frequency band, selects the X, Ku frequency band electromagnetic wave to pass through, and finally outputs the electromagnetic wave signals with only X, Ku frequency band in the vertical polarization from the lowest layer skin layer 1.

With reference to fig. 1 and 4, the X, Ku dual-band wave-transmitting structure provided by the invention can realize dual functions of band-pass of X, Ku frequency bands and band-stop of other frequency bands, so that a radar system with the antenna housing with the dual-band wave-transmitting structure can normally work on two frequency bands at the same time, has good electromagnetic wave-transmitting characteristics, and can ensure that electronic equipment in the antenna housing normally works.

A second aspect of the invention provides a use of the frequency selective structure of the first aspect of the invention in a radar system.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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.