CN115864007B - Circular sector ultra-wideband radar scattering cross section reducing structure - Google Patents
Circular sector ultra-wideband radar scattering cross section reducing structure Download PDFInfo
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
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Abstract
The invention discloses a circular sector ultra-wideband radar scattering cross section reducing structure, which comprises a polarization conversion ultra-surface unit; the circular fan-shaped structure designed by the asymmetric double-arrow ultra-wideband polarization conversion structure is arranged on the front face of the polarization conversion ultra-surface unit, the ultra-wideband RCS reduction effect of more than 10dB in the bandwidth of 13.7GHz-27.5GHz is achieved, the reduction bandwidth is wider, and the performance is better. The super-surface chessboard structure is skillfully combined with the coding theory, and the fact that electromagnetic wave scattering lobes can be controlled by manually adjusting the arrangement of the super-surface structure is demonstrated, so that the super-surface chessboard structure presents different shape characteristics and direction characteristics, and the structural parameters are simple and easy to adjust and easy to realize during manufacturing.
Description
Technical Field
The invention relates to the field of radar communication, in particular to a circular sector ultra-wideband radar scattering cross section reducing structure.
Background
Radar cross section Reduction (RCS) reduction has important applications in many areas, particularly in military stealth and antenna design. Some existing RCS reduction technologies, such as electromagnetic bandgap and high impedance surfaces, have limited applications due to complex cell structures, narrow RCS bandwidth, large dielectric plate thickness, and inability of the operating band to cover Ku, K bands, etc.
For example: the invention is as follows: the 2bit coded super surface of high-precision low RCS (application number: CN 202210722491.5) is composed of 4 super subunits, each super subunit is composed of 4 identical subunits, but the unit structure is complex, and the processing and manufacturing of the object are difficult.
The invention is as follows: an ultra-thin broadband RCS reduction coding electromagnetic super surface (application number: CN 202210035426.5) is characterized in that a plurality of broadband RCS reduction units are arranged in a checkerboard arrangement mode, so that the RCS reduction effect of more than 5dB in a frequency band of 12-20GHz is achieved, but the design has the defects of narrow reduction bandwidth, insignificant reduction performance and the like.
Disclosure of Invention
The invention aims to provide a circular sector-shaped ultra-wideband radar scattering cross section reducing structure, and the designed circular sector-shaped structure realizes the ultra-wideband RCS reducing effect of more than 10dB in the bandwidth of 13.7GHz-27.5GHz, and has wider reducing bandwidth and better performance. The super-surface chessboard structure is skillfully combined with the coding theory, and the fact that electromagnetic wave scattering lobes can be controlled by manually adjusting the arrangement of the super-surface structure is demonstrated, so that the super-surface chessboard structure presents different shape characteristics and direction characteristics, and the structural parameters are simple and easy to adjust and easy to realize during manufacturing.
A circular sector ultra-wideband radar scattering cross section reducing structure comprises a polarization conversion ultra-surface unit;
The front surface of the polarization conversion super-surface unit is provided with an asymmetric double-arrow ultra-wideband polarization conversion structure;
The length l=2.3 mm of the middle stub of the asymmetric double-arrow ultra-wideband polarization conversion structure, the line width w=0.2 mm, the lengths l1 and l2 of the single side lines of the upper and lower side arrows of the asymmetric double-arrow ultra-wideband polarization conversion structure are 1.5mm, the included angle alpha=56 DEG between the single side line of the upper side arrow and the middle stub, and the included angle beta=80 DEG between the single side line of the lower side arrow and the middle stub;
And rotating the polarization conversion super-surface unit by 90 degrees along the center to obtain a mirror image unit, and arranging the polarization conversion super-surface unit and the mirror image unit into a chessboard structure.
Preferably, the polarization conversion super-surface units and the mirror image units thereof are arranged into a disc-shaped chessboard structure, the disc-shaped structure is divided into eight sector areas by eight straight lines, the adjacent sector areas are composed of the polarization conversion super-surface units and the mirror image units thereof, the polarization conversion super-surface units and the mirror image units thereof are sequentially arranged at intervals along the direction of 8 axes at the center, and finally the polarization conversion super-surface units and the mirror image units thereof are arranged into an integral sector super-surface structure.
Preferably, the front surface of the polarization conversion super-surface unit is square, the side length p=4mm, and the thickness of the polarization conversion super-surface unit is d=1.5mm.
Preferably, the asymmetric double-arrow ultra-wideband polarization conversion structure is made of copper.
Preferably, the polarization conversion super surface unit is composed of two-sided copper sheets and an intermediate substrate, wherein the substrate selects F4B with dielectric constant epsilon=2.2 and loss tangent tan delta=0.001 as a dielectric material.
The invention has the advantages that:
1. The structure provided by the invention has the advantages of simple unit structure, ultra-wide band and thin thickness, and can effectively realize electromagnetic stealth;
2. an asymmetric double-arrow ultra-wideband polarization conversion super-surface (PCM) unit is designed, the polarization conversion bandwidth of more than 10dB is 18.1GHz-32.7GHz, and the polarization conversion rate is close to 100% in the ultra-wideband;
3. The ultra-surface chessboard structure is skillfully combined with the coding theory, which proves that the electromagnetic wave scattering lobe can be controlled by manually adjusting the arrangement of the ultra-surface structure, so that the ultra-surface chessboard structure presents different shape characteristics and direction characteristics;
4. the designed novel PCM circular fan-shaped structure can realize ultra-wideband RCS reduction of more than 10dB in 13.7GHz-27.5 GHz.
Drawings
FIG. 1 is a side view and a front view of a polarization conversion subsurface unit of the present invention;
FIG. 2 is a schematic diagram of a chessboard structure according to the present invention;
FIG. 3 is a schematic view of a circular sector structure in the present invention;
FIG. 4 is a schematic diagram of simulation results of a 17.5GHz far-field scattering mode according to the invention;
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in figures 1 to 4, the ultra-wideband RCS reduction with manually adjustable scattering direction is realized by designing the basic unit structure of the polarization conversion ultra-surface to form a periodic structure unit, then, the periodic arrangement of the unit structure is carried out, and then, the two mechanisms of the chessboard structure of the polarization conversion ultra-surface and 1 bit coding are combined to form the composite ultra-surface, so that the ultra-wideband RCS reduction has wide application prospect in the microwave field. Compared with other super surfaces, the method has the advantages of simple design, small unit size and the like, and the method skillfully combines the concept of sector chessboard structure and coding, can realize broadband RCS reduction, and can also artificially regulate the direction of the reflected wave beam.
Fig. 1 shows a schematic structure of a designed polarization conversion subsurface unit. The specific geometric parameters of the unit are that the unit period side length p=4 mm, the middle stub length l=2.3 mm, the line width w=0.2 mm, the arrow line lengths l1 and l2 are 1.5mm, the thickness d of the medium substrate is=1.5 mm, and the included angle alpha=56 degrees and beta=80 degrees. Both the asymmetric double arrow-head structure and the back metal plate are made of copper. F4b having a dielectric constant epsilon=2.2 and a loss tangent tan δ=0.001 was selected as the dielectric substrate.
The designed polarization conversion super-surface unit structure is rotated by 90 degrees along the center to obtain mirror image units, and the polarization conversion super-surface units and the mirror image units are arranged into a chessboard structure, as shown in figure 2. The checkerboard structure is composed of 10 x 10 PCM cells.
Fig. 3 is a stacked view of the unit. The numerals "0" and "1" denote polarization conversion subsurface units and mirror image units thereof, respectively. The polarization conversion super-surface units and the mirror image units thereof are arranged according to the figure 3, the whole disc is divided into eight sector areas by eight straight lines, the adjacent sector areas are composed of the polarization conversion super-surface units and the mirror image units thereof, the polarization conversion super-surface units and the mirror image units thereof are orderly arranged at intervals along the direction of 8 axes of the center, and finally the whole disc is arranged into an integral sector super-surface structure.
Specific embodiments and principles:
F4b having a dielectric constant of epsilon=2.2 and a loss tangent of tan δ=0.001 was selected as a dielectric substrate, and copper sheets were attached to both sides of the substrate to prepare rectangular blocks having a side length of p=4 mm and a pole thickness of d=1.5 mm as polarization conversion super surface units.
And then attaching an asymmetric double-arrow type ultra-wideband polarization conversion structure on the front surface of the polarization conversion ultra-surface unit, wherein the asymmetric double-arrow type ultra-wideband polarization conversion structure is a thin sheet made of copper.
As shown in fig. 1, the length l=2.3 mm of the middle stub of the asymmetric double-arrow ultra-wideband polarization conversion structure, the line width w=0.2 mm, the lengths l1 and l2 of the single side lines of the upper and lower side arrows of the asymmetric double-arrow ultra-wideband polarization conversion structure are 1.5mm, and the included angle α=56° between the single side line of the upper side arrow and the middle stub, and the included angle β=80° between the single side line of the lower side arrow and the middle stub.
The extremely finished conversion super-surface unit is rotated by 90 degrees along the center to obtain a mirror image unit, and the polarization conversion super-surface unit and the mirror image unit are arranged into a disc-shaped chessboard structure as shown in fig. 3. The disc-shaped structure is divided into eight sector areas by eight straight lines, the adjacent sector areas are composed of polarization conversion super-surface units and mirror image units thereof, the adjacent sector areas are sequentially and alternately arranged along the direction of 8 axes at the center, and finally the whole sector super-surface structure is formed.
A simulation of the 17.5GHz far field scattering pattern is shown in fig. 4. It can be seen that the reflected wave scatters in many directions like petals, which greatly reduces the size of the main petals, effectively reducing back scattering. Thus, the structure combining the checkerboard structure with the coded super surface achieves multidirectional scattering of electromagnetic waves. The structure can control the regularity of electromagnetic wave scattering more artificially than a random encoding structure, and the direction of the randomly scattered electromagnetic wave is disordered.
Based on the above, the circular fan-shaped structure designed by the invention realizes the ultra-wideband RCS reduction effect of more than 10dB within the bandwidth of 13.7GHz-27.5GHz, and has wider reduction bandwidth and better performance. The super-surface chessboard structure is skillfully combined with the coding theory, and the fact that electromagnetic wave scattering lobes can be controlled by manually adjusting the arrangement of the super-surface structure is demonstrated, so that the super-surface chessboard structure presents different shape characteristics and direction characteristics, and the structural parameters are simple and easy to adjust and easy to realize during manufacturing.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Claims (4)
1. A circular sector ultra-wideband radar scattering cross section reducing structure is characterized by comprising a polarization conversion ultra-surface unit;
The front surface of the polarization conversion super-surface unit is provided with an asymmetric double-arrow ultra-wideband polarization conversion structure;
the length l=2.3 mm of the middle stub of the asymmetric double-arrow ultra-wideband polarization conversion structure, the line width w=0.2 mm, the lengths l1 and l2 of the single side lines of the upper and lower side arrows of the asymmetric double-arrow ultra-wideband polarization conversion structure are 1.5mm, the included angle alpha=56 DEG between the single side line of the upper side arrow and the middle stub, and the included angle beta=80 DEG between the single side line of the lower side arrow and the middle stub;
Rotating the polarization conversion super-surface unit by 90 degrees along the center to obtain a mirror image unit thereof, and arranging the polarization conversion super-surface unit and the mirror image unit thereof into a chessboard structure;
The polarization conversion super-surface units and the mirror image units thereof are arranged into a disc-shaped chessboard structure, the disc-shaped structure is divided into eight sector areas by eight straight lines, the adjacent sector areas are composed of the polarization conversion super-surface units and the mirror image units thereof, the polarization conversion super-surface units and the mirror image units thereof are sequentially arranged at intervals along the direction of 8 axes at the center, and finally the polarization conversion super-surface units and the mirror image units thereof are arranged into an integral sector super-surface structure.
2. The circular sector ultra wideband radar cross-section reducing structure of claim 1, wherein: the front surface of the polarization conversion super-surface unit is square, the side length p=4mm, and the thickness of the polarization conversion super-surface unit is d=1.5 mm.
3. The circular sector ultra wideband radar cross-section reducing structure of claim 1, wherein: the asymmetric double-arrow ultra-wideband polarization conversion structure is made of copper.
4. The circular sector ultra wideband radar cross-section reducing structure of claim 1, wherein: the polarization conversion subsurface unit is composed of two-sided copper sheets and an intermediate substrate, wherein the substrate is made of F4B with dielectric constant epsilon=2.2 and loss tangent tan delta=0.001 as a dielectric material.
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| CN202211614570.0A CN115864007B (en) | 2022-12-13 | 2022-12-13 | Circular sector ultra-wideband radar scattering cross section reducing structure |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465000A (en) * | 2017-07-23 | 2017-12-12 | 中国人民解放军空军工程大学 | Broadband, the insensitive spiral coding RCS of polarization reduce super surface and its design method |
| CN110098487A (en) * | 2019-04-25 | 2019-08-06 | 中国传媒大学 | A kind of super surface of ULTRA-WIDEBAND RADAR scattering section reduction |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7006047B2 (en) * | 2003-01-24 | 2006-02-28 | Bae Systems Information And Electronic Systems Integration Inc. | Compact low RCS ultra-wide bandwidth conical monopole antenna |
| US11831073B2 (en) * | 2020-07-17 | 2023-11-28 | Synergy Microwave Corporation | Broadband metamaterial enabled electromagnetic absorbers and polarization converters |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465000A (en) * | 2017-07-23 | 2017-12-12 | 中国人民解放军空军工程大学 | Broadband, the insensitive spiral coding RCS of polarization reduce super surface and its design method |
| CN110098487A (en) * | 2019-04-25 | 2019-08-06 | 中国传媒大学 | A kind of super surface of ULTRA-WIDEBAND RADAR scattering section reduction |
Non-Patent Citations (3)
| Title |
|---|
| Broadband RCS Reduction Using Circular Sector Structure;huijuan dai 等;《International Journal of RF and Microwave Computer-Aided Engineering》;20230626;全文 * |
| Ultra-Wideband RCS Reduction Using Polarization Conversion Metasurfaces;Shokrollah Karimian 等;《2020 28th Iranian Conference on Electrical Engineering (ICEE)》;20201126;全文 * |
| 基于极化转换超表面的宽带低雷达散射截面缝隙天线阵;潘晨清 等;《强激光与粒子束》;20211031;全文 * |
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