CN109216931A - Miniaturization low section frequency-selective surfaces based on nested curved structure - Google Patents
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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
- H01Q15/0053—Selective devices used as spatial filter or angular sidelobe filter
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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
- H01Q15/0093—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices having a fractal shape
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Abstract
本发明公开了一种基于嵌套曲折结构的小型化低剖面的频率选择表面，主要解决现有频率选择表面小型化程度低的问题。其包括M×N个周期排列的频率选择表面单元，每个频率选择表面单元包含介质板(2)、印制在介质板(2)上表面的金属贴片(1)和下表面的金属贴片(3)，其中上金属贴片(1)由两条上弯折金属条带(111)和(112)嵌套铺设在介质板(2)的上表面组成，下金属贴片(3)由两条下弯折金属条带(311)和(312)嵌套铺设在介质板(2)的下表面组成；上、下金属贴片在空间排布上相差90度。本发明充分利用了频率选择表面的平面空间，增大了单元等效电容与等效电感，提高了小型化程度，可用于通讯系统与雷达天线罩。
The invention discloses a miniaturized low-profile frequency selective surface based on a nested zigzag structure, which mainly solves the problem of low miniaturization degree of the existing frequency selective surface. It comprises M×N frequency selective surface units arranged periodically, each frequency selective surface unit comprising a dielectric plate (2), a metal patch (1) printed on the upper surface of the dielectric plate (2) and a metal patch on the lower surface. Sheet (3), wherein the upper metal patch (1) is composed of two upper bent metal strips (111) and (112) nested on the upper surface of the dielectric plate (2), and the lower metal patch (3) It consists of two lower bent metal strips (311) and (312) nested and laid on the lower surface of the dielectric plate (2); the upper and lower metal patches differ by 90 degrees in spatial arrangement. The invention makes full use of the plane space of the frequency selection surface, increases the equivalent capacitance and equivalent inductance of the unit, improves the degree of miniaturization, and can be used for communication systems and radar radomes.
Description
Technical field
The invention belongs to Electromagnetic Fields and Microwave Technology fields, and in particular to a kind of frequency-selective surfaces, can be used for communicate with
In terms of radar.
Background technique
With the fast development of science and technology, using electromagnetic wave as medium, the product communicated using electromagnetic wave is increasingly
More, following problem is exactly that influence of the electromagnetic wave to environment and the mankind is increasing.For example it taking off, navigating by water and is dropping
During the entire process of falling, requires that mobile communication equipment whole process is closed, prevent radio wave to aircraft and airport communication link with this
The interference in border；In the course of work of various precise electronic medical instruments, electromagnetic wave that individual mobile terminal equipment is emitted
Interference may be generated to medical instrument, influence the precision of instrument；For multiple aperture base station, each antenna pole of itself
It is easy to produce mutual coupling, influences mutual antenna performance；The mobile terminals such as computer can also launch the information of carrying while it is working
Electromagnetic wave, the electromagnetic wave of leakage receives and cracked by enemy's electronic equipment, causes national defence, politics, military affairs, science and technology etc.
The leakage of aspect information.In addition, electromagnetic radiation can also cause injury directly or indirectly to human body.Therefore, it is right to find a kind of energy
The technology that electromagnetic energy is selected and shielded is for administering electromagnetic pollution, eliminating Electromagnetic Interference, raising electromagnetic compatibility very
Necessity, the appearance of frequency-selective surfaces is so that the above problem is preferably solved.
Frequency-selective surfaces FSS is a kind of special spatial filter, the periodical battle array being made of passive resonance unit
Array structure has selecting frequency characteristic to incident electromagnetic wave.The topological structure of passive resonance unit determines frequency-selective surfaces pair
The response of incident electromagnetic wave makes frequency-selective surfaces show the spy of total reflection or total transmissivity to the electromagnetic wave at resonance frequency
Property.Frequency-selective surfaces can be divided into patch-type and shaped grooved according to cellular construction, can be divided into bandpass-type and band according to working effect
Resistance type, patch-type frequency-selective surfaces show as band resistance type more, and shaped grooved frequency-selective surfaces show as bandpass-type more.
Traditional frequency-selective surfaces are since passive resonance unit electric size is larger, the passive resonance in finite size
Element number is less, and frequency-selective surfaces edge will generate biggish surface current reflection effect at work, when making work
Resonance frequency point and resonance frequency point when design generate biggish error.In addition, biggish passive resonance unit electric size causes
It is poor that electromagnetic wave can generate in oblique incidence biggish reflected phase between unit, to increase frequency-selective surfaces in electromagnetism
The error of resonance frequency point and the resonance frequency point when design when wave oblique incidence.
In order to eliminate counter productive caused by the biggish passive resonance unit of electric size, researcher passes through miniaturization method
It is poor to reduce edge surface current reflection effect and reflected phase.Such as 2017, Zhao Zhenzhen, Zhang Anxue et al. was in IEEE
A name is delivered on 553-556 pages of phase in the 16th of Antennas and Wireless Propagation Letters periodical
For " Stopband Frequency Selective Surface With Ultra-Large Angle ofIncidence "
Paper discloses a kind of frequency-selective surfaces that angle stability is high, by printing " Swastika in the upper surface of dielectric-slab " shape gold
" H " shape minor matters are respectively printed at four endpoints of category band, " Swastika " shape band, and at four ends of each " H " shape minor matters
The small minor matters of " H " type are respectively printed at point again, form the passive resonance cellular construction of 0.114 resonance wavelength, it is good to realize
Good miniaturization effect, reduces phase difference of the electromagnetic wave of oblique incidence between passive resonance unit, so that it is steady to improve angle
It is qualitative.But due to this structure " Swastika " shape metal band can not it is most effective increase resonant element equivalent capacity and electricity
Sense, so that degree of miniaturization is still lower.
Summary of the invention
It is a kind of based on the small of nested curved structure it is an object of the invention in view of the deficiency of the prior art, propose
Type low section frequency-selective surfaces, to further increase frequency-selective surfaces in the degree of miniaturization of low-frequency range.
To achieve the goals above, the miniaturization low section frequency-selective surfaces of the invention based on nested curved structure,
It include: M × N number of periodic arrangement frequency-selective surfaces unit, M >=5, N >=5, each frequency-selective surfaces unit includes medium
The metal patch of plate, the metal patch for being printed on dielectric-slab upper surface and lower surface, it is characterised in that:
Upper metal patch is made of the upper surface that two upper bending metal band nestings are laid on dielectric-slab, lower metal patch
The lower surface that dielectric-slab is laid on by bending metal band nesting under two forms；
Upper metal patch and lower metal patch differ 90 degree on spatial arrangement.
Further, the dielectric-slab uses side length for P, with a thickness of the square structure of the low section of h, wherein 4mm≤P≤
12mm, 0.127mm≤h≤8mm.
Further, first metal band and Article 2 metal band are centrosymmetric point on the lower metal patch
Cloth；First metal band distribution that is centrosymmetric same as Article 2 metal band on upper metal patch.
Further, the upper metal patch and lower metal patch, outmost turns final stage bending part line width are w1, remaining
The line widths of all metal bands be w2, wherein 0.1mm≤w1≤2mm, 0.1mm≤w2≤4mm.
Further, under the formation two bending metal bands of metal patch in the mutually nested paving in the lower surface of dielectric-slab
If first following surface left upper apex is origin, XOY areal coordinate system is established；Again with (x, y) for starting point, x≤10mm, y≤10mm,
Then to the bending sequence of a metal band are as follows:
First extend L16 to negative x-axis, then extend L15 to negative y-axis, then extend L14 to positive x-axis, then extend L13 to positive y-axis,
Extend L12 to positive x-axis again, then extends L11 to negative y-axis, then extend L10 to negative x-axis, then extend L9 to positive y-axis, then to positive x-axis
Extend L8, then extends L7 to negative y-axis, then extend L6 to negative x-axis, then extend L5 to negative y-axis, then extend L4 to positive x-axis, then to just
Y-axis extends L3, then extends L2 to negative x-axis, then extend L1 to negative y-axis, so far constitutes the first metal band, in which:
The line width of L2~L16 is w2, and the line width of L1 is w1；
The length parameter of each line segment is as follows:
0.2mm≤L16≤1.2mm, 0.7mm≤L15≤2.8mm, 0.7mm≤L14≤2.8mm,
0.8mm≤L13≤3.2mm, 0.3mm≤L12≤1.2mm, 1.1mm≤L11≤4.4mm,
1.5mm≤L10≤6mm, 1.5mm≤L9≤6mm, 1.9mm≤L8≤7.6mm,
1.9mm≤L7≤7.6mm, 2mm≤L6≤8mm, 0.3mm≤L5≤1.2mm, 2.3mm≤L4≤9.2mm,
2.7mm≤L3≤10.8mm, 2.75mm≤L2≤11mm, 2.9mm≤L1≤11.6mm；
Again by first metal band around resonant element center x=0mm, y=0mm rotation 180 degree obtains the second metal strip
Band.
Further, the upper metal patch is obtained by the rotation to lower metal patch, i.e., by lower metal patch around humorous
Shake unit center x=0mm, and y=0mm is rotated by 90 °, and constitutes the upper metal being made of the first metal band and the second metal band
Patch.
Compared with the prior art, the invention has the following advantages:
1, the present invention is due to the metal band composition resonant element using mutually nested bending, thus is increasing frequency selection
While surface cell equivalent inductance, the equivalent capacity of unit is also increased；Simultaneously because same metal band is sandwiched between
Adjacent metal tape line, reduced while increasing unit equivalent capacity metal band because back and forth bending brought by itself
Coupling, this structure make resonant element possess the degree of miniaturization of 0.02 resonance wavelength, and can 0 to 60 degree angular domain it
Between keep angle stability, maximum frequency deviation 0.02GHz.
2, the present invention controls a polarization direction using by upper metal patch, and lower metal patch controls another polarization direction
Research Thinking, the layer capacitance between double layer of metal patch generated due to the ultralow section of frequency-selective surfaces further mentioned
The high degree of miniaturization of resonant element.
3, all usable areas in single layer are maximumlly utilized using the graphic structure of mutually nested bending in the present invention,
And strip-type metal broken line does not waste any plane space, improves the degree of miniaturization of resonant element.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the resonant element structural schematic diagram in the present invention；
Fig. 3 is the structural schematic diagram of lower metal patch in the present invention；
Fig. 4 is the first metal band structural schematic diagram of lower metal patch in the present invention；
Fig. 5 is S21 simulation result diagram of the embodiment of the present invention 1 under TE polarization incidence wave irradiation；
Fig. 6 is S21 simulation result diagram of the embodiment of the present invention 2 under TE polarization incidence wave irradiation.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the invention will be further described:
Embodiment 1
Referring to Fig.1, the frequency-selective surfaces of the higher miniaturization low section based on nested curved structure, including M × N number of week
The frequency-selective surfaces unit of phase arrangement, M=20, N=20.Passive resonance unit is square unit, the frequency selection of composition
Surface is square structure.
Referring to Fig. 2, frequency-selective surfaces unit include cross-sectional shape be square dielectric-slab 2, be printed on dielectric-slab 2
First metal patch 1 of upper surface and the second metal patch 3 of lower surface, in which:
The dielectric-slab 2, its side length is P=6mm, with a thickness of h=0.5mm, relative dielectric constant 2.2；
And upper metal patch (1) and lower metal patch (3) differ 90 degree on spatial arrangement.
Referring to Fig. 3, by bending under two, metal band 311 and 312 is nested to be laid on dielectric-slab 2 to the lower metal patch 3
Lower surface composition, first metal band (311) and Article 2 metal band (312) are centrosymmetric distribution.
Referring to Fig. 4, two bending metal bands 311 and 312 of the lower metal patch 3 are embedding in the lower surface of dielectric-slab 2
Set is laid with, and first following surface left upper apex is origin, establishes XOY areal coordinate system；Again with (x, y) for starting point, x=3.8mm, y=
4.1mm carries out bending arrangement to metal band, puts in order as follows:
First extend to negative x-axis, the length is L16=0.6mm；Extend again to negative y-axis, the length is L15=1.4mm；Again
Extend to positive x-axis, the length is L14=1.4mm；Extend again to positive y-axis, the length is L13=1.6mm；Prolong again to positive x-axis
It stretches, the length is L12=0.6mm；Extend again to negative y-axis, the length is L11=2.2mm；Extend again to negative x-axis, the length is
L10=3mm；Extend again to positive y-axis, the length is L9=3mm；Extend again to positive x-axis, the length is L8=3.8mm；Again to negative
Y-axis extends, and the length is L7=3.8mm；Extend again to negative x-axis, the length is L6=4mm；Extend again to negative y-axis, length
For L5=0.6mm；Extend again to positive x-axis, the length is L4=4.6mm；Extend again to positive y-axis, the length is L3=5.7mm；
Extend again to negative x-axis, the length is L2=5.5mm；Extend again to negative y-axis, the length is L1=5.8mm；So far first is constituted
Metal band 311.
Again by first metal band 311 around resonant element center x=0mm, y=0mm rotation 180 degree obtains the second metal
Band 312.
The lower metal patch 3 is rotated by 90 ° around resonant element center x=0mm, y=0mm, is constituted by the first metal
The upper metal patch 1 of band 111 and the second metal band 112 composition.It is small-sized to finally obtain the height based on nested curved structure
Change the frequency-selective surfaces of low section.
Embodiment 2
This example is identical as the structure of embodiment 1, and M × N number of periodic arrangement frequency-selective surfaces unit number and line width
It is identical as the parameter of embodiment 1, only following parameter is made an adjustment:
2 side length of dielectric-slab is P=7.4mm, thickness h=1.2mm, relative dielectric constant 4.4；First metal band 311
Each line segment length parameter are as follows:
L16=0.5mm, L15=1.5mm, L14=1.5mm, L13=1.8mm, L12=0.7mm, L11=2.5mm, L10
=3.5mm, L9=3.5mm, L8=4.5mm, L7=4.5mm, L6=4.8mm, L5=0.7mm, L4=5.5mm, L3=
6.5mm L2=6.7mm, L1=7mm, x=3.7mm, y=3.7mm.
Effect of the present invention can be further illustrated by following l-G simulation test:
Emulation 1: using business simulation software HFSS_13.0 to above-described embodiment 1 different angle incidence wave irradiation under
S21 parameter carries out simulation calculation, as a result as shown in Figure 5:
From figure 5 it can be seen that the resonance frequency point in the case where 0 ° of incidence angle is irradiated of the frequency-selective surfaces in embodiment 1 is 1.44GHz,
Under TE polarization, at 1.44GHz, error is no more than resonance frequency point when electromagnetic wave incident angle is respectively 15 °, 30 °, 45 ° and 60 °
0.02GHz has good angle stability；From in Fig. 5 it can also be seen that the present invention in frequency-selective surfaces unit be situated between
When the relative dielectric constant of matter is 2.2, electric size only has 0.03 resonance wavelength, shows that the present invention has good miniaturization
Effect.
Emulation 2: using business simulation software HFSS_13.0 to above-described embodiment 2 different angle incidence wave irradiation under
S21 parameter carries out simulation calculation, as a result as shown in Figure 6:
As seen from Figure 6, the resonance frequency point in the case where 0 ° of incidence angle is irradiated of the frequency-selective surfaces in embodiment 2 is 0.95GHz,
Under TE polarization, when electromagnetic wave incident angle is respectively 15 °, 30 °, 45 ° and 60 °, resonance frequency point is at 0.95GHz, and error is not
More than 0.02GHz, the electric size when the relative dielectric constant of medium is 4.4 only has 0.02 resonance wavelength, shows the present invention
With good miniaturization effect, angle stability is also guaranteed.
To sum up, the present invention can be while keep frequency selects surface angle stability, the raising frequency of high degree
It selects the degree of miniaturization on surface and reduces the thickness of dielectric layers of frequency-selective surfaces unit.
Above description is only two embodiments of the invention, does not constitute any limitation of the invention, it is clear that for ability
It, all may be in the feelings without departing substantially from the principle of the invention, structure after having understood the content of present invention and principle for the professional in domain
Under condition, various modifications and variations in form and details are carried out, but these modifications and variations based on inventive concept still exist
Within scope of protection of the claims of the invention.
Claims (6)
1. a kind of miniaturization low section frequency-selective surfaces based on nested curved structure, comprising: M × N number of periodic arrangement frequency
Rate selection surface cell, M >=5, N >=5, each frequency-selective surfaces unit include dielectric-slab (2), are printed on dielectric-slab (2)
The metal patch (1) on surface and the metal patch (3) of lower surface, it is characterised in that:
Upper metal patch (1) is by two upper bending metal band (111) upper surfaces for being laid on dielectric-slab (2) nested with (112)
Composition, lower metal patch (3) is by bending metal band (311) lower surface for being laid on dielectric-slab (2) nested with (312) under two
Composition；
Upper metal patch (1) and lower metal patch (3) differ 90 degree on spatial arrangement.
2. the miniaturization low section frequency-selective surfaces based on nested curved structure according to claim 1, feature
Be: dielectric-slab (2) uses side length for P, with a thickness of the square structure of the low section of h, wherein 4mm≤P≤12mm,
0.127mm≤h≤8mm。
3. the miniaturization low section frequency-selective surfaces according to claim 1 based on nested curved structure, feature exist
It is centrosymmetric distribution in first metal band (311) of: lower metal patch (3) and Article 2 metal band (312)；Upper gold
Belong to patch (1) upper first metal band (111) and Article 2 metal band (112) to be centrosymmetric distribution.
4. the miniaturization low section frequency-selective surfaces according to claim 1 based on nested curved structure, feature exist
In: upper metal patch (1) and lower metal patch (3), outmost turns final stage bending part line width are w1, remaining all metal
The line width of band is w2, wherein 0.1mm≤w1≤2mm, 0.1mm≤w2≤4mm.
5. the miniaturization low section frequency-selective surfaces according to claim 1 based on nested curved structure, feature exist
In: two bendings metal band (311) for forming lower metal patch (3) are mutually nested in the lower surface of dielectric-slab (2) with (312)
It is laid with, first following surface left upper apex is origin, establishes XOY areal coordinate system；Again with (x, y) for starting point, x≤10mm, y≤
10mm, then to the bending sequence of a metal band are as follows:
First extend L16 to negative x-axis, then extends L15 to negative y-axis, then extend L14 to positive x-axis, then to positive y-axis extension L13, then to
Positive x-axis extends L12, then extends L11 to negative y-axis, then extend L10 to negative x-axis, then extend L9 to positive y-axis, then extend to positive x-axis
L8, then extend L7 to negative y-axis, then extend L6 to negative x-axis, then extend L5 to negative y-axis, then extend L4 to positive x-axis, then to positive y-axis
Extend L3, then extend L2 to negative x-axis, then extend L1 to negative y-axis, so far constitutes the first metal band (311), in which:
The line width of L2~L16 is w2, and the line width of L1 is w1；
The length parameter of each line segment is as follows:
0.2mm≤L16≤1.2mm, 0.7mm≤L15≤2.8mm, 0.7mm≤L14≤2.8mm,
0.8mm≤L13≤3.2mm, 0.3mm≤L12≤1.2mm, 1.1mm≤L11≤4.4mm,
1.5mm≤L10≤6mm, 1.5mm≤L9≤6mm, 1.9mm≤L8≤7.6mm,
1.9mm≤L7≤7.6mm, 2mm≤L6≤8mm, 0.3mm≤L5≤1.2mm,
2.3mm≤L4≤9.2mm, 2.7mm≤L3≤10.8mm, 2.75mm≤L2≤11mm,
2.9mm≤L1≤11.6mm；
Again by first metal band (311) around resonant element center x=0mm, y=0mm rotation 180 degree obtains the second metal strip
Band (312).
6. the miniaturization low section frequency-selective surfaces according to claim 1 based on nested curved structure, feature exist
In: upper metal patch (1) is obtained by the rotation to lower metal patch, i.e., by lower metal patch (3) around resonant element center x
=0mm, y=0mm are rotated by 90 °, and are pasted in composition by the metal that the first metal band (111) and the second metal band (112) form
Piece (1).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112186362A (en) * | 2020-09-15 | 2021-01-05 | 重庆邮电大学 | Dual-frequency miniaturized frequency selective surface with complementary structure |
| CN112201959A (en) * | 2020-09-29 | 2021-01-08 | 中国船舶重工集团公司第七二四研究所 | Large-angle stable miniaturized frequency selection surface |
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