CN107425290B - Bilateral abrupt-drop bandwidth adjustable frequency selection surface - Google Patents
Bilateral abrupt-drop bandwidth adjustable frequency selection surface Download PDFInfo
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- CN107425290B CN107425290B CN201710792398.0A CN201710792398A CN107425290B CN 107425290 B CN107425290 B CN 107425290B CN 201710792398 A CN201710792398 A CN 201710792398A CN 107425290 B CN107425290 B CN 107425290B
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- 230000002146 bilateral effect Effects 0.000 title claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 51
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000005452 bending Methods 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 2
- 238000001914 filtration Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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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- 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
- H01Q15/0026—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 said selective devices having a stacked geometry or having multiple layers
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- Aerials With Secondary Devices (AREA)
Abstract
The invention discloses a double-sided steep-drop band-stop type frequency selection surface, and belongs to the technical field of spatial filtering. The frequency selective surface comprises a five-layer structure, and sequentially comprises a first frequency selective surface metal layer, a first medium layer, a square ring metal layer, a second medium layer and a second frequency selective surface metal layer from top to bottom, wherein the two frequency selective surface metal layers are the same as the medium layer and are symmetrical relative to the middle square ring metal layer; the frequency selective surface metal structure is connected with four corners of the square ring and the bottom edge of the triangle through four bent metal wires. The invention realizes the bandpass response with frequency response of bilateral abrupt drop by introducing transmission zero points; the frequency selective surface can change the position of the transmission zero point and the bandwidth of the passband by adjusting the caliber of the middle square ring metal layer.
Description
Technical Field
The invention belongs to the technical field of microwave filtering, and particularly relates to a frequency selective surface with adjustable bilateral steep-drop bandwidth.
Background
The frequency selective surface (Frequency selective surface, FSS) is formed by a large number of regularly arranged metal patch units or periodically arranged open-pore slit units on a metal screen, and its unit shape, arrangement of units, electrical properties of the medium, etc. affect its frequency selective properties. The frequency selective surface will exhibit reflective or transmissive properties around the unit resonant frequency, which is essentially a spatial filter, but will not absorb energy.
One of the most main applications of the frequency selective surface is to develop an aircraft stealth radome by utilizing the band-pass type frequency selective surface, and the main principle is to design a radar frequency band of a host side on a passband of the frequency selective surface and design a radar detection frequency band of an enemy side on a stopband of the frequency selective surface, so that the host side guided antenna can transmit and receive freely, and the enemy detection radar can scatter to the surrounding space by utilizing the shape of the radar cross section area of the radome with low radar scattering, so that echo of the detection direction is greatly weakened, and thus the stealth, anti-interference and anti-burst performances of the aircraft are improved. Based on the principle, the ideal frequency selection surface has lower loss in the passband, rolls off rapidly outside the passband and enters the stopband, and the lower the stopband transmittance is, the better. To achieve the above performance, the theoretical optimal design approach employs a multi-screen frequency selective surface cascade structure. However, the multi-screen frequency selective surface structure is often not adaptable to a limited space due to the need to fill the dielectric layer used as an impedance transformer and the thickness of the dielectric layer is about a quarter of the center wavelength, which results in a very large thickness of the entire frequency selective surface structure. Meanwhile, the loss of the multi-layer dielectric with a certain thickness can deteriorate the passband performance, and the complex structure and process limit the application of the multi-layer dielectric.
Disclosure of Invention
The invention aims to provide a bilateral abrupt drop frequency selection surface, which realizes the rapid rolling outside a passband into a stop band to achieve bilateral abrupt drop of bandpass transmission response by introducing transmission zero points at two sides of the passband; bandwidth control is achieved through position adjustment of the transmission poles.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the bilateral abrupt-drop frequency selective surface structure is composed of a plurality of periodically distributed units, each unit sequentially comprises a first frequency selective surface metal layer (1), a first dielectric layer (2), a square ring metal layer (3), a second dielectric layer (4) and a second frequency selective surface metal layer (5) from top to bottom, wherein the two frequency selective surface metal layers (1) (5) have the same structure and are symmetrically arranged relative to the middle square ring metal layer (3); the dielectric layers (2) and (4) have the same structure and are symmetrically arranged relative to the middle square ring metal layer (3); the first frequency selective surface metal layer (1) and the second frequency selective surface metal layer (5) are mainly composed of square rings (11) and four metal unit structures arranged in the square rings, wherein the metal unit structures comprise bending lines (12) and triangular structures (13), and the four metal unit structures are distributed in a central symmetry manner;
furthermore, the caliber of the frequency selective surface square ring metal layer (3) is variable according to actual requirements.
Further, the bending line (12) is composed of first to fifth longitudinal bending lines and first to fourth transverse bending lines, and adjacent longitudinal bending lines are perpendicular to the transverse bending lines; the first longitudinal bending line is perpendicular to the bottom edge of the triangular structure (13), and one end of the first bending line is connected with the center of the bottom edge of the triangular structure (13); the fifth longitudinal bending line is connected with the inner angle of the square ring (11).
Further, the first dielectric layer (2) and the second dielectric layer (4) of the frequency selective surface are made of F4B-2.
Further, when the working frequency of the frequency selective surface is near 5GHz, the material thickness of the first dielectric layer (2) and the second dielectric layer (4) is 1.2mm.
Further, when the working frequency of the frequency selective surface is near 5GHz, the unit structure parameters are as follows: d=8.8 mm, a 1 ＝0.8mm，a 2 ＝0.4mm，a 3 ＝1.15mm，b 1 ＝0.48mm，b 2 ＝0.8mm，c 1 ＝1.6mm，c 2 ＝2.6mm，c 3 ＝1.4mm，w＝0.2mm。
D represents the side length of the unit structure, a 1 Represents the edge width, a, of the square ring (11) 2 Represents the distance, a, between adjacent triangular structures (13) 3 Representing the nearest distance between the triangle structure (13) and the inner edge of the square ring (11); b 1 Representing the length of the first longitudinal bend line, b 2 Representing the length of the third longitudinal bend line, c 1 Representing the length of the first transverse bend line, c 2 Representing the length of the second transverse bend line, c 3 Represents the third transverse bend line length and w represents the bend line width.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, transmission zero points are added at two sides of a passband in the frequency selective surface transmission response, so that bilateral abrupt drop at two sides of the passband is realized, the transition band between the passband and the stopband is reduced, the stopband transmittance at two sides is greatly inhibited, and the stopband transmittance near the passband is lower; the transmission response in-band loss is less than 1dB, and the transmission response in-band loss has good flat top characteristic; the aperture of the middle layer square ring can be adjusted according to actual requirements to realize the selection of the passband bandwidth and the position of the transmission zero point; the unit size of the frequency selective surface is about one seventh wavelength, and has the characteristic of miniaturization; still has good transmission response under different polarizations and oblique incidence conditions.
Drawings
FIG. 1 is a schematic three-dimensional view of a frequency selective surface unit according to the present invention;
FIG. 2 is a schematic diagram of a frequency selective surface metal layer unit according to the present invention;
FIG. 3 is a schematic diagram of a frequency selective surface square ring metal layer according to the present invention;
FIG. 4 is a graph of transmission coefficients of a frequency selective surface according to the present invention at different square ring caliber sizes;
fig. 5 is a graph showing the transmission curve of the frequency selective surface according to the present invention under 45 ° oblique incidence of electromagnetic waves: wherein, FIG. 5A is a transmission curve of TE waves; FIG. 5B is a transmission curve of a TM wave;
in the figure: (1) is a first frequency selective surface metal layer, (2) is a dielectric layer, (3) is a square ring metal layer, (4) is a dielectric layer, and (5) is a second frequency selective surface metal layer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the frequency selective surface metal unit structure of the invention sequentially comprises a first frequency selective surface metal layer (1), a first dielectric layer (2), a square ring metal layer (3), a second dielectric layer (4) and a second frequency selective surface metal layer (5) from top to bottom, wherein the two frequency selective surface metal layers (1) (5) and the dielectric layers (2) (4) are the same and symmetrical with respect to the middle square ring metal layer (3); the first metal layer and the second metal layers (1) (5) mainly comprise square rings (11) and four metal unit structures arranged in the square rings; the metal unit structures comprise bending lines (12) and triangular structures (13), and the four metal unit structures are distributed in a central symmetry manner;
the bilateral steep drop frequency selective surface with the band-stop resonant frequency at 5GHz designed according to the figure 1 has the thickness of a dielectric layer (2) and a dielectric layer (4) of 1.2mm, the dielectric material is F4B-2, the dielectric constant is 2.65, and the unit structural parameters of a metal layer (figure 2) of the frequency selective surface are as follows: d=8.8 mm, a1=0.8 mm, a2=0.4 mm, a3=1.15 mm, b1=0.48 mm, b2=0.8 mm, c1=1.6 mm, c2=2.6 mm, c3=1.4 mm, w=0.2 mm.
Simulation is carried out, and fig. 4 is a graph of transmission coefficients of the frequency selective surface according to the present invention under different square ring caliber sizes, wherein the abscissa is frequency, and the ordinate is S parameter. In the figure, two transmission zero points can be clearly observed, the introduction of the transmission zero points can greatly enhance the rejection degree of the stop band, and the selectivity of the frequency selective surface can be well realized. When the caliber of the middle layer metal square ring is changed, the bandwidth of the pass band of the frequency selective surface is changed, and the opening size of the caliber of the middle layer square ring can be determined according to the bandwidth actually required. In addition, the frequency selective surface has a certain miniaturization characteristic, and is convenient for practical application.
Fig. 5A and 5B are graphs of transmission coefficients of TE wave and TM wave incident angles incident from 45 degrees when the opening aperture r of the intermediate square ring is 3.8mm, respectively. The transmission response of the bandpass of the frequency selective surface is almost unchanged under oblique incidence condition, regardless of TE wave or TM wave, so the frequency selective surface has good angle stability and polarization stability.
The above detailed description is only for the purpose of helping to understand the core idea of the present invention, and other embodiments are also possible, and modifications and adaptations of the present invention should and are intended to be within the scope of the claims of the present invention without departing from the principle of the present invention.
Claims (4)
1. The bilateral abrupt-drop frequency selective surface structure consists of a plurality of units which are periodically distributed, and is characterized in that each unit sequentially comprises a first frequency selective surface metal layer (1), a first dielectric layer (2), a square ring metal layer (3), a second dielectric layer (4) and a second frequency selective surface metal layer (5) from top to bottom, wherein the two frequency selective surface metal layers (1) (5) have the same structure and are symmetrically arranged relative to the middle square ring metal layer (3); the dielectric layers (2) and (4) have the same structure and are symmetrically arranged relative to the middle square ring metal layer (3); the first frequency selective surface metal layer (1) and the second frequency selective surface metal layer (5) are composed of square rings (11) and four metal unit structures arranged in the square rings; the metal unit structures comprise bending lines (12) and triangular structures (13), and the four metal unit structures are distributed in a central symmetry manner; the bending lines (12) are composed of first to fifth longitudinal bending lines and first to fourth transverse bending lines, and adjacent longitudinal bending lines are perpendicular to the transverse bending lines; the first longitudinal bending line is perpendicular to the bottom edge of the triangular structure (13), and one end of the first bending line is connected with the center of the bottom edge of the triangular structure (13); the fifth longitudinal bending line is connected with the inner angle of the square ring (11); the caliber of the square ring (11) is adjusted to realize the selection of the passband bandwidth and the position of the transmission zero point; by introducing transmission zero points at two sides of the passband, the passband can rapidly roll off to enter the stopband to achieve bilateral abrupt drop of bandpass transmission response.
2. The dual steep drop frequency selective surface structure according to claim 1, wherein the dielectric layer material is F4B-2.
3. The double-sided steep drop frequency selective surface structure according to claim 1, wherein the dielectric layer material thickness is 1.2mm at an operating frequency near 5GHz, the cell parameters are d=8.8 mm, a1=0.8 mm, a2=0.4 mm, a3=1.15 mm, b1=0.48 mm, b2=0.8 mm, c1=1.6 mm, c2=2.6 mm, c3=1.4 mm, w=0.2 mm; wherein D represents the side length of the unit structure, a1 represents the side width of the square ring (11), a2 represents the distance between adjacent triangular structures (13), and a3 represents the nearest distance between the triangular structures (13) and the inner side of the square ring (11); b1 denotes a first longitudinal bend line length, b2 denotes a third longitudinal bend line length, c1 denotes a first transverse bend line length, c2 denotes a second transverse bend line length, c3 denotes a third transverse bend line length, and w denotes a bend line width.
4. The dual steep drop frequency selective surface structure according to claim 1, wherein the cell size of the frequency selective surface is one seventh wavelength.
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| CN201710792398.0A CN107425290B (en) | 2017-09-05 | 2017-09-05 | Bilateral abrupt-drop bandwidth adjustable frequency selection surface |
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| CN201710792398.0A CN107425290B (en) | 2017-09-05 | 2017-09-05 | Bilateral abrupt-drop bandwidth adjustable frequency selection surface |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034408A (en) * | 2019-04-24 | 2019-07-19 | 西安电子科技大学 | A kind of broad passband 3D frequency-selective surfaces |
| CN110676592B (en) * | 2019-11-04 | 2021-06-29 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| WO2021171499A1 (en) * | 2020-02-27 | 2021-09-02 | 三菱電機株式会社 | Frequency-selective surface unit element, frequency-selective surface, and radio wave absorber |
| CN111613892B (en) * | 2020-06-29 | 2022-02-18 | 中国舰船研究设计中心 | Double-side steep out-of-band rejection frequency selection radome composite material interlayer structure |
| CN112751205B (en) * | 2020-12-25 | 2021-11-05 | 南京航空航天大学 | Double-layer medium 2.5-dimensional band-stop frequency selection surface |
| CN116207507B (en) * | 2023-03-27 | 2024-07-23 | 中国舰船研究设计中心 | Steep cut-off three passband frequency selective material structure |
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