CN112467393B - Dual-band RCS reduction super surface based on FSS and polarization rotation super surface - Google Patents
Dual-band RCS reduction super surface based on FSS and polarization rotation super surface Download PDFInfo
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- CN112467393B CN112467393B CN202011423075.2A CN202011423075A CN112467393B CN 112467393 B CN112467393 B CN 112467393B CN 202011423075 A CN202011423075 A CN 202011423075A CN 112467393 B CN112467393 B CN 112467393B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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Abstract
The invention belongs to the field of electromagnetic metamaterials, relates to a low-RCS (Radar Cross section) super surface, in particular to a dual-band RCS (Radar Cross section) shrinkage reducing super surface based on FSS (frequency selective surface) and polarization rotating super surface, and is characterized in that: at least comprises the following steps: the low-frequency RCS reduction super surface consists of a low-frequency RCS reduction patch array, a first layer of dielectric substrate and a metal floor, and the low-frequency RCS reduction patch array is printed on the lower surface of the first layer of dielectric substrate; the high-frequency RCS reduction super surface consists of a high-frequency RCS reduction patch array, a second-layer dielectric substrate and an FSS, and the high-frequency RCS reduction patch array is printed on the upper surface of the second-layer dielectric substrate; and two layers of metal patch arrays of the FSS are respectively printed on the lower surface of the second layer of dielectric substrate and the upper surface of the first layer of dielectric substrate. The upper-layer high-frequency RCS reduction super surface and the lower-layer low-frequency RCS reduction super surface can work in high and low frequency bands simultaneously through the FSS, and the dual-band RCS reduction super surface based on the FSS with two frequency bands independently regulated is achieved.
Description
Technical Field
The invention belongs to the field of electromagnetic metamaterials, relates to a low-RCS (Radar Cross section) super surface, and particularly relates to a dual-band RCS (Radar Cross section) reduction super surface based on FSS (frequency selective surface) and polarization rotation super surface, which can be used for an electromagnetic structure with low scattering characteristic requirements.
Background
In modern war, with the development of remote detection technology, the status of traditional weaponry is gradually reduced, and the status of stealth and anti-stealth technology is gradually improved. Radar is the most dominant detection means for long range detection. How to avoid detection by radar becomes an increasingly important issue. The radar cross section is a measure of the return power of a target in a given direction under plane wave illumination, and is a main parameter for describing the stealth characteristics of an object.
The frequency selective surface can generate different transmission and reflection effects according to the frequency of incident electromagnetic waves, and a good bridge is provided for designing the dual-band electromagnetic control metamaterial.
The means for reducing the radar cross section characteristics of the object mainly comprise a radar wave-absorbing material loading technology, a shape technology and an active or passive cancellation technology, wherein the first two are the most effective and the most common. Two Dual-Band EBG structures are proposed in a paper "Dual Wide-Band Checker surface for radio Cross Section Reduction" published by Wengang Chen, Constant A. Balanis, and Craig R. Birtcher on IEEE, wherein one is a rectangular ring and a concentric rectangle, and the other is a circular ring and a concentric circle, and the two EBG structures can realize the RCS Reduction characteristic of the Dual-Band after being combined into an array due to different reflection phases. However, this design, which uses only one RCS reduction array to achieve dual-band RCS reduction, has two bands very close together on one hand and a narrower bandwidth on the other hand.
Disclosure of Invention
The invention provides an FSS-based dual-band RCS reduction super surface which can enable low-frequency incident electromagnetic waves to penetrate through an upper layer structure to irradiate a lower layer low-frequency RCS reduction super surface so as to achieve dual-band RCS reduction, and simultaneously enable the upper layer high-frequency RCS reduction super surface and the lower layer low-frequency RCS reduction super surface to simultaneously work in high and low frequency bands through FSS so as to achieve independent regulation and control of the two frequency bands.
The invention aims to realize the dual-band RCS (radar cross section) reduced super surface based on FSS (frequency selective surface) and polarized rotating super surface, which is characterized in that: at least comprises the following steps: the low-frequency RCS reducing super surface 1 and the high-frequency RCS reducing super surface 2 are arranged in sequence, the low-frequency RCS reducing super surface 1 is composed of a low-frequency RCS reducing patch array 4, a first layer of dielectric substrate 5 and a metal floor 6, and the low-frequency RCS reducing patch array 4 is printed on the lower surface of the first layer of dielectric substrate 5; the high-frequency RCS reduction super surface 2 consists of a high-frequency RCS reduction patch array 7, a second-layer dielectric substrate 8 and an FSS3, wherein the high-frequency RCS reduction patch array 7 is printed on the upper surface of the second-layer dielectric substrate 8; the two metal patch arrays 31 of the FSS3 are respectively printed on the lower surface of the second layer of dielectric substrate 8 and the upper surface of the first layer of dielectric substrate 5.
The low-frequency RCS reduced patch array 4 is composed of 4 low-frequency polarization rotary patch arrays 41, the low-frequency polarization rotary patch array 41 is composed of 36 low-frequency polarization rotary patch units 411, wherein the low-frequency polarization rotary patch units 411 are formed by cutting a pair of right-angled triangles 4111 from a rectangle with the side length of 9.9mm, the side length of the right-angled side of the cut right-angled triangle 4111 is 8.2mm, the period of the low-frequency polarization rotary patch unit 411 is 12mm, the low-frequency polarization rotary patch units 411 are copied and translated to form a 6 x 6 low-frequency polarization rotary patch array 41, and then the low-frequency polarization rotary patch array 41 is sequentially rotated by 90 degrees to form a 2 x 2 low-frequency RCS reduced patch array 4.
The high-frequency RCS reduction patch array 7 is composed of 4 high-frequency polarization rotation patch arrays 71, the high-frequency polarization rotation patch arrays 71 are composed of 144 high-frequency polarization rotation patch units 711, the high-frequency polarization rotation patch units 711 are formed by cutting a pair of right-angled triangles 7111 from a rectangle with the side length of 4.24mm, the side length of the right-angled sides of the cut right-angled triangles 7111 is 3.11mm, the period of the high-frequency polarization rotation patch units 711 is 6mm, the high-frequency polarization rotation patch units 711 are copied and translated to form 12 x 12 high-frequency polarization rotation patch arrays 71, and the high-frequency polarization rotation patch arrays 71 are sequentially rotated by 90 degrees to form 2 x 2 high-frequency RCS reduction patch arrays 7.
The two-layer metal patch array 31 of the FSS3 is composed of 576 metal patch units 311, each metal patch unit 311 is a rectangle with the side length of 4mm and the period of 6mm, the metal patch units are copied and translated to obtain the metal patch array 31 of each layer, and finally the FSS3 is composed of an upper layer metal patch array and a lower layer metal patch array.
The thickness of the first layer of dielectric substrate 5 is 2mm, and the dielectric constant epsilonr =4.4。
The thickness of the second layer of dielectric substrate 8 is 1.7mm, and the dielectric constant epsilonr =2.2。
The distance between the lower surface of the first layer of dielectric substrate 5 and the metal floor 6 is 7 mm.
The distance between the lower surface of the second layer of dielectric substrate 8 and the upper surface of the first layer of dielectric substrate 5 is 3 mm.
The invention has the following beneficial effects: a dual-band RCS (radar cross section) reducing super surface based on FSS (frequency selective surface system) and polarization rotation super surface comprises a low-frequency RCS reducing super surface 1 and a high-frequency RCS reducing super surface 2, wherein the low-frequency RCS reducing super surface 1 consists of a low-frequency RCS reducing patch array 4, a first layer of dielectric substrate 5 and a metal floor 6, and the low-frequency RCS reducing patch array 4 is printed on the lower surface of the first layer of dielectric substrate 5; the high-frequency RCS reduction super surface 2 consists of a high-frequency RCS reduction patch array 7, a second-layer dielectric substrate 8 and an FSS3, wherein the high-frequency RCS reduction patch array 7 is printed on the upper surface of the second-layer dielectric substrate 8; the two metal patch arrays 31 of the FSS3 are respectively printed on the lower surface of the second layer of dielectric substrate 8 and the upper surface of the first layer of dielectric substrate 5.
1. According to the invention, FSS is introduced to replace the metal floor with the upper-layer high-frequency RCS reduction super-surface, so that low-frequency incident electromagnetic waves can irradiate the lower-layer low-frequency RCS reduction super-surface through the upper-layer structure, and thus dual-band RCS reduction is realized.
2. According to the invention, the upper-layer high-frequency RCS reduction super surface and the lower-layer low-frequency RCS reduction super surface can simultaneously work in high and low frequency bands through the FSS, so that the dual-band RCS reduction characteristic of independent regulation of the two frequency bands is realized.
Drawings
FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;
FIG. 2 is a schematic top view of a low frequency RCS reduction array and its polarization rotation subarrays according to an embodiment of the present invention;
FIG. 3 is a schematic top view of a high frequency RCS reduction array and its polarization rotation subarrays according to an embodiment of the present invention;
FIG. 4 is a schematic top view of a frequency selective array according to an embodiment of the present invention;
FIG. 5 is a graph of the reflection coefficient S11 characteristic of a low frequency RCS reducing super-surface in an embodiment of the present invention;
FIG. 6 is a graph of the reflection coefficient S11 characteristic of a high frequency RCS reducing super-surface in an embodiment of the present invention;
FIG. 7 is a graph showing the transmission coefficient S21 and reflection coefficient S11 characteristics of FSS in an embodiment of the present invention;
fig. 8 is a comparison of RCS of an embodiment of the present invention and a reference metal floor.
In the figure, 1, low frequency RCS reduces the super surface; 2. high frequency RCS reducing the super surface; 3. FSS; 31. a metal patch array; 311. a metal patch unit; 4. a low frequency RCS reduction patch array; 41. a low-frequency polarization rotating patch array; 411. a low-frequency polarization rotation patch unit; 4111. a low frequency right triangle; 5. a first dielectric substrate; 6. a metal floor; 7. a high frequency RCS reduction patch array; 71. high-frequency polarization rotating patch array; 711. a high-frequency polarization rotation patch unit; 7111. a high-frequency right-angled triangle; 8. and a second dielectric substrate.
Detailed Description
The embodiments are described in connection with the drawings for the purpose of illustrating the technical content, structural features, and objects and effects of the present invention in detail.
Examples
Referring to fig. 1, a dual band RCS reduced super-surface based on FSS and polarized rotating super-surface comprises at least: the low-frequency RCS reducing super surface 1 and the high-frequency RCS reducing super surface 2 are arranged in sequence, the low-frequency RCS reducing super surface 1 is composed of a low-frequency RCS reducing patch array 4, a first layer of dielectric substrate 5 and a metal floor 6, and the low-frequency RCS reducing patch array 4 is printed on the lower surface of the first layer of dielectric substrate 5; the high-frequency RCS shrinkage-reducing super surface 2 is composed of a high-frequency RCS shrinkage-reducing patch array 7, a second-layer dielectric substrate 8 and an FSS3, wherein the high-frequency RCS shrinkage-reducing patch array 7 is printed on the upper surface of the second-layer dielectric substrate 8, and two metal patch arrays 31 of the FSS3 are respectively printed on the lower surface of the second-layer dielectric substrate 8 and the upper surface of the first-layer dielectric substrate 5.
The thickness of the first layer of dielectric substrate 5 is 2mm, and the dielectric constant epsilonr =4.4。
The thickness of the second layer of dielectric substrate 8 is 1.7mm, and the dielectric constant epsilonr =2.2。
The distance between the lower surface of the first dielectric substrate 5 and the metal floor 6 is 7 mm.
The distance between the lower surface of the second layer of dielectric substrate 8 and the upper surface of the first layer of dielectric substrate 5 is 3 mm.
Referring to fig. 2, the low-frequency RCS reduced patch array 4 is composed of 4 low-frequency polarization rotary patch arrays 41, the low-frequency polarization rotary patch array 41 is composed of 36 low-frequency polarization rotary patch units 411, wherein the low-frequency polarization rotary patch units 411 are formed by cutting a pair of low-frequency right-angled triangles 4111 from a rectangle with a side length of 9.9mm, the side length of the right-angled side of the cut low-frequency right-angled triangle 4111 is 8.2mm, the period of the low-frequency polarization rotary patch unit 411 is 12mm, the low-frequency polarization rotary patch units 411 are copied and translated to form a 6 × 6 low-frequency polarization rotary patch array 41, and then the low-frequency polarization rotary patch array 41 is sequentially rotated by 90 degrees to copy to form a 2 × 2 low-frequency RCS reduced patch array 4.
Referring to fig. 3, the high-frequency RCS reduced patch array 7 is composed of 4 high-frequency polarization rotating patch arrays 71, the high-frequency polarization rotating patch array 71 is composed of 144 high-frequency polarization rotating patch units 711, wherein the high-frequency polarization rotating patch units 711 are formed by cutting a pair of high-frequency right-angled triangles 7111 from a rectangle with a side length of 4.24mm, the side length of the right-angled sides of the cut high-frequency right-angled triangles 7111 is 3.11mm, the period of the high-frequency polarization rotating patch units 711 is 6mm, the high-frequency polarization rotating patch units 711 are copied and translated to form a 12 × 12 high-frequency polarization rotating patch array 71, and then the high-frequency polarization rotating patch array 71 is sequentially rotated by 90 degrees and copied to form a 2 × 2 high-frequency RCS reduced patch array 7.
Referring to fig. 4, the two-layer metal patch array 31 of the FSS3 is composed of 576 metal patch units 311, each metal patch unit 311 is a rectangle with a side length of 4mm and a period of 6mm, and after being copied and translated, the metal patch array 31 of each layer is obtained, and finally, the FSS3 is composed of an upper layer metal patch array and a lower layer metal patch array.
The technical effects of the invention are further explained by combining simulation experiments as follows:
1. simulation conditions and contents:
1.1 the reference object is a metal floor of the same size as the RCS reduced super surface.
1.2 the polarization rotation effect of the polarization rotation super-surface in the embodiment is simulated and calculated by using commercial simulation software CST2020, and the result graphs are shown in FIG. 5 and FIG. 6
1.3 simulation calculation of frequency selection effect of FSS in the example by using commercial simulation software CST2020, the result graph is shown in FIG. 7
1.4 simulation calculations were performed on the RCS of the example and reference metal floor using commercial simulation software CST2020, and the RCS comparison graph of the example and reference metal floor is shown in fig. 8.
2. And (3) simulation results:
referring to fig. 5, the abscissa is frequency, the ordinate is co-polarized reflection coefficient and cross-polarized reflection coefficient, and the low-frequency polarization rotation bandwidth of the present embodiment is 7.2-12GHz based on the criterion that the cross-polarized reflection coefficient is 10dB greater than the co-polarized reflection coefficient.
Referring to fig. 6, the abscissa is frequency, the ordinate is co-polarization reflection coefficient and cross-polarization reflection coefficient, and the high frequency polarization rotation bandwidth of the present embodiment is 27.5-38GHz based on the criterion that the cross-polarization reflection coefficient is 10dB greater than the co-polarization reflection coefficient.
Referring to FIG. 7, the abscissa is frequency, the ordinate is reflection coefficient and transmission coefficient, and the low-pass bandwidth of the FSS in this embodiment is 5-20GHz based on the reflection coefficient being less than-10 dB.
Referring to FIG. 8, the abscissa is frequency, the ordinate is RCS, and the RCS of the dual-band RCS reduced super-surface is 10dB smaller than that of a metal floor with the same size, the reduced bandwidth of the low-frequency RCS of the embodiment is 6.9-12GHz, and the reduced bandwidth of the high-frequency RCS is 28-38 GHz.
The foregoing description is only a specific example of the present invention and should not be construed as limiting the invention in any way, and it will be apparent to those skilled in the art that various modifications and variations in form and detail can be made without departing from the principle and structure of the invention, but these modifications and variations will still fall within the scope of the appended claims.
Claims (7)
1. A dual-band RCS reduction super-surface based on FSS and polarization rotation super-surface is characterized in that: at least comprises the following steps: the low-frequency RCS reduction super surface (1) and the high-frequency RCS reduction super surface (2), wherein the low-frequency RCS reduction super surface (1) consists of a low-frequency RCS reduction patch array (4), a first layer of dielectric substrate (5) and a metal floor (6), the low-frequency RCS reduction patch array (4) is printed on the lower surface of the first layer of dielectric substrate (5), and the metal floor (6) is located below the low-frequency RCS reduction patch array (4); the high-frequency RCS reduction super surface (2) consists of a high-frequency RCS reduction patch array (7), a second-layer dielectric substrate (8) and an FSS (3), wherein the high-frequency RCS reduction patch array (7) is printed on the upper surface of the second-layer dielectric substrate (8); two layers of metal patch arrays (31) of the FSS (3) are respectively printed on the lower surface of the second layer of dielectric substrate (8) and the upper surface of the first layer of dielectric substrate (5); the two layers of metal patch arrays (31) of the FSS (3) are all composed of 576 metal patch units (311), the metal patch units (311) are rectangles with the side length of 4mm and the period of 6mm, the metal patch units are copied and translated to obtain the metal patch array (31) of each layer, and finally the FSS (3) is composed of an upper layer of metal patch array and a lower layer of metal patch array; the second layer of dielectric substrate (8), the upper layer of metal patch array and the upper layer of metal patch array are sequentially arranged from top to bottom.
2. The dual band RCS tapered super-surface of claim 1 based on FSS and polarized rotating super-surface, wherein: the low-frequency RCS reduced patch array (4) is composed of 4 low-frequency polarization rotary patch arrays (41), the low-frequency polarization rotary patch array (41) is composed of 36 low-frequency polarization rotary patch units (411), wherein the low-frequency polarization rotary patch units (411) are formed by cutting a pair of low-frequency right-angled triangles (4111) from a rectangle with the side length of 9.9mm, the side length of the right-angled side of the cut low-frequency right-angled triangle (4111) is 8.2mm, the period of the low-frequency polarization rotary patch unit (411) is 12mm, the low-frequency polarization rotary patch unit (411) is copied and translated to form a 6 x 6 low-frequency polarization rotary patch array (41), and then the low-frequency polarization rotary patch array (41) is sequentially rotated for 90 degrees to form a 2 x 2 low-frequency RCS reduced patch array (4).
3. The dual band RCS tapered super-surface of claim 1 based on FSS and polarized rotating super-surface, wherein: the high-frequency RCS reduction patch array (7) is composed of 4 high-frequency polarization rotation patch arrays (71), each high-frequency polarization rotation patch array (71) is composed of 144 high-frequency polarization rotation patch units (711), each high-frequency polarization rotation patch unit (711) is formed by cutting a pair of right-angled triangles (7111) from a rectangle with the side length of 4.24mm, the side length of the right-angled side of the cut right-angled triangle (7111) is 3.11mm, the period of each high-frequency polarization rotation patch unit (711) is 6mm, the high-frequency polarization rotation patch units (711) are copied and translated to form a 12 x 12 high-frequency polarization rotation patch array (71), and then the high-frequency polarization rotation patch arrays (71) are sequentially rotated by 90 degrees and copied to form a 2 x 2 high-frequency RCS reduction patch array (7).
4. The dual band RCS tapered super-surface of claim 1 based on FSS and polarized rotating super-surface, wherein: the thickness of the first layer dielectric substrate (5) is 2mm, and the dielectric constant epsilon r = 4.4.
5. The dual band RCS tapered super-surface of claim 1 based on FSS and polarized rotating super-surface, wherein: the thickness of the second layer dielectric substrate (8) is 1.7mm, and the dielectric constant epsilon r is 2.2.
6. The dual band RCS tapered super-surface of claim 1 based on FSS and polarized rotating super-surface, wherein: the distance between the lower surface of the first layer of dielectric substrate (5) and the metal floor (6) is 7 mm.
7. The dual band RCS tapered super-surface of claim 1 based on FSS and polarized rotating super-surface, wherein: and the distance between the lower surface of the second layer of dielectric substrate (8) and the upper surface of the first layer of dielectric substrate (5) is 3 mm.
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| CN113809556A (en) * | 2021-08-05 | 2021-12-17 | 华南理工大学 | Common-caliber dual-frequency dual-polarized antenna array and communication equipment |
| CN113922077B (en) * | 2021-10-21 | 2023-03-14 | 西安电子科技大学 | Ultra-wideband RCS (radar cross section) reduction super surface based on mutual superposition of polarization conversion bandwidths |
| CN114300853B (en) * | 2021-12-28 | 2024-05-28 | 西安理工大学 | Wideband high-gain antenna array based on super-structured surface |
| CN114336023B (en) * | 2021-12-28 | 2024-05-28 | 西安理工大学 | Broadband high-gain substrate integrated waveguide resonant cavity antenna |
| CN114498047B (en) * | 2022-01-10 | 2023-03-28 | 西安电子科技大学 | Broadband low-RCS (radar cross section) super-surface structure based on scattering and absorption synergistic effect |
| CN115395241A (en) * | 2022-09-22 | 2022-11-25 | 电子科技大学 | Dual-frequency broadband RCS reduction super surface based on polarization rotation super surface |
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