CN112290225B - Large-angle broadband frequency selective surface - Google Patents
Large-angle broadband frequency selective surface Download PDFInfo
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- CN112290225B CN112290225B CN202011156533.0A CN202011156533A CN112290225B CN 112290225 B CN112290225 B CN 112290225B CN 202011156533 A CN202011156533 A CN 202011156533A CN 112290225 B CN112290225 B CN 112290225B
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- array layer
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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Abstract
The invention provides a large-angle broadband frequency selection surface, which belongs to the technical field of electromagnetic wave frequency selection surfaces and comprises a first dielectric substrate, a first metal structure array layer, a second dielectric substrate, a second metal structure array layer, a third dielectric substrate, a third metal structure array layer and a fourth dielectric substrate which are sequentially stacked from bottom to top; the first metal structure array layer, the second metal structure array layer and the third metal structure array layer are formed by periodically arranging discrete metal patches. The invention obtains a broadband low-frequency transmission high-frequency reflection type frequency selective surface by coupling of a plurality of layers of metal arrays; on one hand, the problem that the insertion loss in a band is overlarge when the band is incident at a large angle in the existing frequency selection surface technology is solved; on the other hand, the high-frequency grating lobe is restrained, so that the problem that the normal work of the frequency selection surface is influenced due to the fact that the high-frequency grating lobe is rapidly enhanced and rapidly moves to a low frequency because the incident angle is too large is solved.
Description
Technical Field
The invention belongs to the technical field of electromagnetic wave frequency selection surfaces, and particularly relates to a large-angle broadband frequency selection surface.
Background
The frequency selective surface is a two-dimensional periodic structure formed by periodically arranged patch elements or slot elements, and shows a frequency selective filter characteristic for the propagation of electromagnetic waves, namely, the selection characteristic changes along with the change of frequency, and the electromagnetic waves in some frequency bands can completely pass through the frequency selective surface, and the electromagnetic waves in other frequency bands can completely reflect. Therefore, the frequency selective surface is also called a spatial electromagnetic filter, and is commonly used in the fields of hybrid radome stealth, design of a sub-reflector of a multi-frequency antenna, electromagnetic compatibility and electromagnetic shielding.
The frequency selective surface stealth radome belongs to the category of shape stealth and must be assisted by the geometrical shape of the radar cover so that the electromagnetic waves are reflected in a direction deviating from the incoming waves: on one hand, the reflected electromagnetic waves cannot be received by an enemy detection radar; on the other hand, electromagnetic waves are prevented from entering the radome, so that strong scattering is generated through secondary excitation of the antenna, and out-of-band stealth of the radar is achieved.
However, the conventional bandpass frequency selective surface has a large passband insertion loss for electromagnetic waves incident at a large angle, and the suppression performance is deteriorated due to the occurrence of grating lobes outside the band.
The present application thus proposes a large angle broadband frequency selective surface.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a large-angle broadband frequency selective surface.
In order to achieve the above purpose, the invention provides the following technical scheme:
a large-angle broadband frequency selective surface comprises a first dielectric substrate, a first metal structure array layer, a second dielectric substrate, a second metal structure array layer, a third dielectric substrate, a third metal structure array layer and a fourth dielectric substrate which are sequentially stacked from bottom to top;
the first metal structure array layer, the second metal structure array layer and the third metal structure array layer are formed by periodically arranging discrete metal patches.
Preferably, the first dielectric substrate, the second dielectric substrate, the third dielectric substrate and the fourth dielectric substrate are epoxy resin-based glass fiber cloth (FR4), and the relative dielectric constant of the epoxy resin-based glass fiber cloth is 4.3.
Preferably, the thicknesses of the first dielectric substrate, the second dielectric substrate, the third dielectric substrate and the fourth dielectric substrate are all 0.1-2.0 mm.
Preferably, the thickness of each of the first dielectric substrate and the fourth dielectric substrate is 0.1 mm; the thickness of the second dielectric substrate and the thickness of the third dielectric substrate are both 1.2 mm.
Preferably, the first metal structure array layer, the second metal structure array layer and the third metal structure array layer are made of materialsAll are metallic copper, the conductivity of the metallic copper is 5.8 multiplied by 107S/m。
Preferably, the first metal structure array layer, the second metal structure array layer and the third metal structure array layer are formed by periodically arranging square annular patches, and the size of the square annular patches in each array layer is different.
Preferably, the unit period of the frequency selective surface is 7.5mm, and the arrangement period of the square annular patches in the first metal structure array layer is one third of the unit period of the frequency selective surface; the arrangement period of the square annular patches in the second metal structure array layer is half of the period of the frequency selective surface unit; the arrangement period of the square annular patches in the third metal structure array layer is the same as the period of the frequency selective surface unit.
The wide-angle broadband frequency selective surface provided by the invention has the following beneficial effects:
(1) the invention obtains a broadband low-frequency high-frequency transmission reflection type frequency selection surface by coupling of a plurality of layers of metal arrays, particularly by changing the arrangement period of each layer of metal array unit.
(2) Simulation results show that the structure solves the problem that the insertion loss in a band is too large when the band is incident at a large angle in the existing frequency selection surface technology; on the other hand, the high-frequency grating lobe is restrained, so that the problem that the normal work of the frequency selection surface is influenced due to the fact that the high-frequency grating lobe is rapidly enhanced and rapidly moves to a low frequency because the incident angle is too large is solved.
(3) The processing and preparation process is mature, the used dielectric plate has low cost, and is easy for large-scale application, and the method has great application potential in the engineering field.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some embodiments of the invention and it will be clear to a person skilled in the art that other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic cross-sectional view of a wide-angle broadband frequency selective surface according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a periodic unit of a first metal array layer of a wide-angle broadband frequency selective surface according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second metal array layer periodic unit of a wide-angle broadband frequency selective surface according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a third metal array layer periodic unit of a wide-angle broadband frequency selective surface according to an embodiment of the present invention;
fig. 5 is a graph of S-parameters at high angle incidence for a frequency selective surface provided by an embodiment of the present invention.
Description of reference numerals:
the array substrate comprises a first dielectric substrate 101, a first metal structure array layer 201, a second dielectric substrate 102, a second metal structure array layer 202, a third dielectric substrate 103, a third metal structure array layer 203 and a fourth dielectric substrate 104.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention and can practice the same, the present invention will be described in detail with reference to the accompanying drawings and specific examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. In the description of the present invention, unless otherwise specified, "a plurality" means two or more, and will not be described in detail herein.
Example 1
The invention provides a large-angle broadband frequency selection surface, which specifically comprises a first dielectric substrate 101, a first metal structure array layer 201, a second dielectric substrate 102, a second metal structure array layer 202, a third dielectric substrate 103, a third metal structure array layer 203 and a fourth dielectric substrate 104 which are sequentially stacked from bottom to top as shown in figure 1;
the first metal structure array layer 201, the second metal structure array layer 202 and the third metal structure array layer 203 are all formed by periodically arranging discrete metal patches.
Further, in this embodiment, the first dielectric substrate 101, the second dielectric substrate 102, the third dielectric substrate 103, and the fourth dielectric substrate 104 are all epoxy resin-based glass fiber cloth (FR4), and the relative dielectric constant of the epoxy resin-based glass fiber cloth is 4.3.
Further, in this embodiment, the thicknesses of the first dielectric substrate 101, the second dielectric substrate 102, the third dielectric substrate 103 and the fourth dielectric substrate 104 are all 0.1-2.0 mm. In this embodiment, the thicknesses of the first dielectric substrate 101 and the fourth dielectric substrate 104 are both 0.1 mm; the thickness of the second dielectric substrate 102 and the third dielectric substrate 103 are both 1.2 mm.
In this embodiment, the relative dielectric constant of the microwave board with low dielectric constant of the first dielectric substrate 101, the second dielectric substrate 102, the third dielectric substrate 103 and the fourth dielectric substrate 104 is 2-5.
Further, in the present embodiment, the first metal structure array layer 201, the second metal structure array layer 202, and the third metal structure array layer 203 are made of copper, and the conductivity of the copper is 5.8 × 107S/m。
Further, in this embodiment, the first metal structure array layer 201, the second metal structure array layer 202, and the third metal structure array layer 203 are all formed by periodically arranging square ring patches, and the size of the square ring patches in each array layer is different.
Specifically, in this embodiment, the unit period P of the frequency selective surface is 7.5mm, and the arrangement period of the square annular patches in the first metal structure array layer 201 is one third of the unit period of the frequency selective surface; the arrangement period of the square annular patches in the second metal structure array layer 202 is half of the period of the frequency selective surface unit; the arrangement period of the square annular patches in the third metal structure array layer 203 is the same as the frequency selective surface unit period.
It should be understood that the material of the above structure is only one of the embodiments of the present invention, and the specific choice is determined according to practical situations, and the present invention is not limited thereto.
The first metal structure array layer 201 of the wide-angle broadband frequency selective surface provided by the embodiment of the invention is composed of square ring-shaped copper patches which are periodically arranged, as shown in fig. 2, only 3 × 3 periodic units are shown, the period of the array unit is p 1-2.5 mm, other parameters are a 1-2.35 mm, and b 1-2.2 mm. The unit period of the frequency selective surface is p, and p is 7.5 mm. The array element period p1 is one third of the element period p of the frequency selective surface. The unit period P herein refers to the outer frame size of the first metal structure array layer 201.
The second metal structure array layer 202 of the wide-angle broadband frequency selective surface provided by the embodiment of the present invention is composed of square ring-shaped copper patches arranged periodically, as shown in fig. 3, only 2 × 2 periodic units are shown, the period of the array unit is p 1-3.75 mm, other parameters a 2-3.59 mm, and b 2-3.09 mm. p-7.5 mm is the unit period of the frequency selective surface of the present invention. The array element period p1 is one-half of the element period p of the frequency selective surface.
The third metal structure array layer 203 of the wide-angle broadband frequency selective surface provided by the embodiment of the present invention is composed of square ring-shaped copper patches arranged periodically, as shown in fig. 4, only 1 period unit is shown, the array unit period is the unit period p of the frequency selective surface of the present invention is 7.5mm, other parameters a3 are 6.7mm, and b3 is 4.9 mm.
It should be understood that the above structural dimensions are only one of the embodiments, and are for illustrative purposes, and the specific dimensional changes are determined according to actual conditions, and the invention is not limited thereto.
Fig. 5 is a simulation curve of a wide-angle broadband frequency selective surface provided by an embodiment of the present invention. As can be seen from the figure, the frequency selective surface has insertion loss less than 1dB in the range of 70-85 degrees of large incident angle below 2.0GHz at low frequency, and ensures the high-efficiency transmission of in-band electromagnetic waves. And in the high-frequency band of 8.0GHz-20.0GHz, the transmissivity is lower than-15 dB, namely the electromagnetic wave in the frequency band is reflected efficiently.
In summary, the wide-angle broadband frequency selective surface provided by the embodiment of the invention obtains a low-pass high-reflection frequency selective surface with good angle stability especially when electromagnetic waves are incident at a large angle through setting the periods of different interlayer metal units in multiples. The high-frequency electromagnetic wave is efficiently transmitted and reflected, the problems of large in-band insertion loss and deteriorated out-of-band inhibition under the condition of large-angle incidence in the conventional frequency selection surface technology are solved, and the high-frequency electromagnetic wave has an important application prospect in the field of antenna housing stealth.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (4)
1. A large-angle broadband frequency selective surface is characterized by comprising a first dielectric substrate (101), a first metal structure array layer (201), a second dielectric substrate (102), a second metal structure array layer (202), a third dielectric substrate (103), a third metal structure array layer (203) and a fourth dielectric substrate (104) which are sequentially stacked from bottom to top;
the first metal structure array layer (201), the second metal structure array layer (202) and the third metal structure array layer (203) are formed by periodically arranging discrete metal patches;
the first metal structure array layer (201), the second metal structure array layer (202) and the third metal structure array layer (203) are all made of metal copper, and the conductivity of the metal copper is 5.8 multiplied by 107S/m;
the first metal structure array layer (201), the second metal structure array layer (202) and the third metal structure array layer (203) are all formed by periodically arranging square annular patches, and the sizes of the square annular patches in each array layer are different;
the unit period P of the frequency selective surface is 7.5mm, and the arrangement period of the square annular patches in the first metal structure array layer (201) is one third of the unit period of the frequency selective surface; the arrangement period of the square annular patches in the second metal structure array layer (202) is half of the period of the frequency selective surface unit; the arrangement period of the square annular patches in the third metal structure array layer (203) is the same as the period of the frequency selective surface unit.
2. The high-angle broadband frequency selective surface of claim 1, wherein the first dielectric substrate (101), the second dielectric substrate (102), the third dielectric substrate (103), and the fourth dielectric substrate (104) are all epoxy resin-based fiberglass cloth, and the epoxy resin-based fiberglass cloth has a relative dielectric constant of 4.3.
3. The high angle broadband frequency selective surface of claim 2, characterized in that the thickness of the first dielectric substrate (101), the second dielectric substrate (102), the third dielectric substrate (103) and the fourth dielectric substrate (104) are all 0.1-2.0 mm.
4. A large angle broadband frequency selective surface according to claim 3, wherein the thickness of the first dielectric substrate (101) and the fourth dielectric substrate (104) are both 0.1 mm; the thicknesses of the second dielectric substrate (102) and the third dielectric substrate (103) are both 1.2 mm.
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| CN113612031A (en) * | 2021-07-30 | 2021-11-05 | 苏州大学 | Flexible reflection enhanced surface structure for vehicle-mounted radar test and preparation method thereof |
| SE2100152A1 (en) * | 2021-10-18 | 2023-04-19 | Saab Ab | A product and method for frequency selective camouflage material |
| CN114824818A (en) * | 2022-05-13 | 2022-07-29 | 厦门大学 | Frequency selection surface working frequency band adjusting device and adjusting method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207038715U (en) * | 2017-07-18 | 2018-02-23 | 山东科技大学 | A kind of radome based on novel frequency selection surface |
| CN109411892A (en) * | 2018-09-07 | 2019-03-01 | 西安电子科技大学 | Double frequency-band inhales wave frequency rate selection surface system and design method, aircraft |
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| US6870511B2 (en) * | 2002-05-15 | 2005-03-22 | Hrl Laboratories, Llc | Method and apparatus for multilayer frequency selective surfaces |
| CN204885449U (en) * | 2015-09-01 | 2015-12-16 | 深圳光启高等理工研究院 | Super material of filtering, antenna house and antenna |
| CN105609908A (en) * | 2016-03-07 | 2016-05-25 | 中国矿业大学 | Dual-band band-pass filter insensitive to polarization and wide-angle incidence |
| WO2018064836A1 (en) * | 2016-10-09 | 2018-04-12 | 华为技术有限公司 | Frequency selective surface |
| CN106911007B (en) * | 2017-03-16 | 2019-04-23 | 西安电子科技大学 | Multi-layer metamaterial surface texture for multi-band frequency selection wave transparent angle |
| CN108777359A (en) * | 2018-05-24 | 2018-11-09 | 西安电子科技大学 | Metamaterial antenna cover based on frequency trigger mechanism |
| CN108957603B (en) * | 2018-07-17 | 2020-11-17 | 中国科学院光电技术研究所 | Ultra-wideband electromagnetic absorption material based on exchange principle of propagation waves and super-structured surface waves in multi-layer sub-wavelength structure |
| CN110265780B (en) * | 2019-06-20 | 2020-11-03 | 南京航空航天大学 | Stealth antenna housing with medium-frequency broadband wave-transmitting, high-frequency and low-frequency polarization conversion |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207038715U (en) * | 2017-07-18 | 2018-02-23 | 山东科技大学 | A kind of radome based on novel frequency selection surface |
| CN109411892A (en) * | 2018-09-07 | 2019-03-01 | 西安电子科技大学 | Double frequency-band inhales wave frequency rate selection surface system and design method, aircraft |
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