CN106058483B - The broadband absorbing material of stable polarization - Google Patents
The broadband absorbing material of stable polarization Download PDFInfo
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- CN106058483B CN106058483B CN201610533699.7A CN201610533699A CN106058483B CN 106058483 B CN106058483 B CN 106058483B CN 201610533699 A CN201610533699 A CN 201610533699A CN 106058483 B CN106058483 B CN 106058483B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
Abstract
The invention proposes a kind of broadband absorbing materials of stable polarization,For solving the difference of polarizer stability existing for existing absorbing material and the technical problem not wide enough in low-frequency range bandwidth,Including absorbent structure (1),Upper dielectric-slab (2),Froth bed (3),Lower dielectric-slab (4) and frequency-selective surfaces (5),Absorbent structure (1) is printed on the upper surface of dielectric-slab (2),Frequency-selective surfaces (5) are printed on the lower surface of lower dielectric-slab (4),Upper dielectric-slab (2),Froth bed (3) and lower dielectric-slab (4) are arranged successively,Form structure stacked on top of one another,Absorbent structure (1) is formed by M × N number of dead square structure metal broken line unit (11) periodic arrangement,Frequency-selective surfaces (5) are formed by M × N number of frequency-selective surfaces unit (51) periodic arrangement,Polarizer stability of the invention is high,Absorption band is wide,Microwave absorbing property is strong,And there is good transmission characteristic in high frequency,It can be used for antenna communication and absorb the fields such as shielding.
Description
Technical field
The invention belongs to the technical fields of absorbing material, are related to absorbing material and frequency-selective surfaces, and in particular to a kind of
The broadband absorbing material of stable polarization, the material polarizer stability is high, and absorption band is wide, and microwave absorbing property is strong, and has in high frequency
There is good transmission characteristic, can be used for antenna communication and absorbs the fields such as shielding.
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, require that mobile communication equipment whole process is closed, radio wave is to Wing Newsletter and airport ring in order to prevent
The interference in border；In the course of work of various precise electronic medical instruments, also require patient that cannot carry communication apparatus；Electricity
Sub- equipment is brought one's own side's electronic equipment of short distance dry in work and the electromagnetic wave that can also radiate carrying information while communication
It disturbs, the information carried also can be received and be cracked by enemy's electronic equipment, cause the side such as national defence, politics, military affairs, science and technology
The leakage of face information.In addition, electromagnetic radiation can also cause injury directly or indirectly to human body.Therefore, find it is a kind of can be to electricity
The material that magnetic energy is weakened and shielded very must for administering electromagnetic pollution, elimination Electromagnetic Interference, improving electromagnetic compatibility
It wants, the appearance of absorbing material is so that the above problem is preferably solved.
Absorbing material is a kind of material for referring to absorb the electromagnetic wave energy for projecting its surface.On engineer application,
In addition to requiring absorbing material that there is high absorptivity to electromagnetic wave in broad frequency band, also require it that there is light weight, heatproof, resistance to
The performances such as wet, anticorrosive.High building stands in great numbers in city, and tall and big building reflection electromagnetic wave will cause ghost image, by absorbing material application
In construction material, this problem can be made to be readily solved.The microwave dark room of absorbing material production can be widely used in radar, lead to
Letter and aerospace field.In addition, absorbing material improves overall performance etc. in the compatibility for improving airborne boat load radar equipment
Aspect also has wide application space.Absorbing material is converted incident electromagnetic wave to by the various different loss mechanisms of material
Thermal energy either other form of energy and achieve the purpose that inhale wave, by technological forming and bearing capacity, absorbing material can be divided into painting
Cover type and structural type.
A kind of common structure of structural absorbing mater ials includes inhaling wave layer, dielectric layer and metallic reflection plate, this suction wave material
Good microwave absorbing property can be achieved in material, but since the total reflection effect of metal plate is without transmission characteristic, application range is smaller.With
Frequency-selective surfaces come substitute absorbing material metallic reflection plate, it can be achieved that special frequency band have transmission characteristic suction wave material
Material.Frequency-selective surfaces typically refer to one kind as resonant element by two-dimensional surface periodic structure made of particular arrangement mode, it is humorous
The shape and structure of vibration unit determines response of the frequency-selective surfaces to spatial electromagnetic wave.Frequency-selective surfaces are in structure type
Patch-type can be divided into, and perhaps slot type can be divided into band resistance type or bandpass-type in transmission characteristic, this is according to resonance list
Reflection characteristic that member is presented or transmissison characteristic determine.
The metallic reflection plate that traditional absorbing material is substituted with band logical frequency-selective surfaces, in the work of band logical frequency-selective surfaces
Make outside frequency band, frequency-selective surfaces have the characteristic of reflection electromagnetic wave, can be used as the floor of absorbent structure；It is selected in band logical frequency
In the working band on surface, absorbent structure does not work, and realizes the good transmission characteristic of electromagnetic wave.So far, it preferably realizes
Wave is inhaled in broad band low frequency, the design of high frequency good transmission characteristic is the ELECTRONICS LETTERS periodical of IET at 2015 6
The moon is delivered《Design of absorptive frequency selective surface with good
transmission at high frequency》, text in propose design a model low-frequency range suction wave frequency band be 2.8~
8.3GHz, relative bandwidth 99%, transmission frequency point are 9.7GHz；The ELECTRONICS LETTERS periodical of IET was at 2016 3
The moon is delivered《Absorptive frequency selective surface using parallel LC resonance》,
Designing a model in the suction wave frequency band of low-frequency range for proposing in text is 3~9GHz, and relative bandwidth 100%, transmitting frequency point is
10GHz, but due to the asymmetry of design structure, can only there are good microwave absorbing property, pole for the incident electromagnetic wave of single polarization
It is poor to change stability, and it is not wide enough to inhale wave frequency band.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art described above, the broadband for proposing a kind of stable polarization is inhaled
Wave material, for solving the difference of polarizer stability existing for existing absorbing material and the technical problem not wide enough in low-frequency range bandwidth.
To achieve the goals above, the technical scheme adopted by the invention is as follows：
A kind of broadband absorbing material of stable polarization, including absorbent structure 1, upper dielectric-slab 2, froth bed 3, lower dielectric-slab
4 and frequency-selective surfaces 5, the absorbent structure 1 be printed on the upper surface of dielectric-slab 2, the frequency-selective surfaces 5 are printed on
The lower surface of lower dielectric-slab 4, the upper dielectric-slab 2, froth bed 3 and lower dielectric-slab 4 are arranged successively, and form structure stacked on top of one another；
The absorbent structure 1 is formed by M × 11 periodic arrangement of N number of metal broken line unit, and each metal broken line unit 11 is by four " bows "
Font metal broken line 111 is alternately connected with four equiarm " L " type metal broken lines 112, forms dead square structure；" bow " word
One notch, indentation, there load are respectively set on the broken line of the opening of type metal broken line 111 inside broken line and two outward openings
There is resistance, for realizing the wide-band and wave-absorbing characteristic of stable polarization, wherein M >=3, N >=3；The frequency-selective surfaces 5 are by M × N
A 51 periodic arrangement of frequency-selective surfaces unit forms, for realizing frequency transfer characteristic.
The broadband absorbing material of above-mentioned stable polarization, the upper dielectric-slab 2 and lower dielectric-slab 4 are all made of opposite Jie
The rectangular plate that electric constant is 2.2~2.65.
The broadband absorbing material of above-mentioned stable polarization, the froth bed 3 are suitable with air using relative dielectric constant
Light-high-strength foamed material.
The broadband absorbing material of above-mentioned stable polarization, the dead square structure, wherein bow " font metal broken line
The notch being arranged on the broken line of 111 openings inside broken line and two outward openings is located at the center of broken line, and opening is inside
Broken line on indentation, there load the first Chip-R 113, the indentation, there on the broken line of two outward openings loads the second patch
Resistance 114.
The broadband absorbing material of above-mentioned stable polarization, the frequency-selective surfaces unit 51, is opened by R × R broken line
511 periodic arrangement of slot unit forms, wherein R >=2, and the broken line slotted unit 511 includes square patch and four arm helicla flutes,
Each arm of the four arms helicla flute is connected to form by a U-typed fluting 5111 and a line-styled fluting 5112, wherein
The bottom edge of each U-typed fluting 5111 of four arm helicla flutes is respectively parallel to the seamed edge of square patch, and each line-styled is opened
Slot 5112 is parallel to the bottom edge of coupled U-typed fluting 5111.
The broadband absorbing material of above-mentioned stable polarization, the M × N number of metal broken line unit 11 and M × N number of frequency choosing
Surface cell 51 is selected, arrangement period is 16.2~17.2mm.
Compared with prior art, the present invention having the following advantages that：
1, of the invention to be formed due to absorbent structure using the metal broken line unit periodic arrangement of multiple dead square structures, it is real
The stable polarization characteristic of absorbent structure is showed；Simultaneously as substituting the metal of traditional absorbing material with band logical frequency-selective surfaces
Reflecting plate, and the form of frequency-selective surfaces unit uses four arm helicla flutes, realizes the stable polarization of electromagnetic wave good transmission
Characteristic can realize the absorption to dual polarization incidence wave under the premise of frequency electromagnetic waves good transmission compared with prior art
Shielding has good polarizer stability.
2, the present invention increases current path, can further decrease unit since absorbent structure is using metal broken line unit
Size, more metal broken line units of arranging in a limited space enhance absorbing material in the wave-absorbing effect of low-frequency range, with
The prior art is compared, and the bandwidth of operation of low-frequency range has effectively been widened.
Simulation result is shown, under the premise of realizing electromagnetic wave good transmission, the suction wavestrip width of absorbing material is 1.9~
7.5GHz, relative bandwidth has reached 119%, and has good polarizer stability.
Detailed description of the invention
Fig. 1 is schematic perspective view of the invention；
Fig. 2 is the structural schematic diagram of metal broken line unit of the present invention；
Fig. 3 is the structural schematic diagram of the frequency-selective surfaces unit of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of broken line slotted unit of the present invention；
Fig. 5 is S11 and S21 simulation result diagram of the embodiment of the present invention 1 under the irradiation of not same polarization incidence wave；
Fig. 6 is the absorbance curves figure that the embodiment of the present invention 1 inhales wave frequency band under the irradiation of not same polarization incidence wave.
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 present invention includes absorbent structure 1, upper dielectric-slab 2, froth bed 3, lower dielectric-slab 4 and frequency-selective surfaces
5；Absorbent structure 1 is printed on the upper surface of dielectric-slab 2, and it is overlapped with the geometric center of the upper surface of upper dielectric-slab 2；Frequency
Selection surface 5 is printed on the lower surface of lower dielectric-slab 4, and it is overlapped with the geometric center of the lower surface of lower dielectric-slab 4；Upper medium
Plate 2, froth bed 3 and lower dielectric-slab 4 are arranged successively, and form structure stacked on top of one another, and upper dielectric-slab 2, froth bed 3 and lower dielectric-slab
4 seamed edge overlaps；Absorbent structure 1 is formed by 11 periodic arrangement of M × N number of dead square structure metal broken line unit, frequency
Rate selection surface 5 is formed by M × 51 periodic arrangement of N number of frequency-selective surfaces unit, wherein M >=3, N >=3, metal broken line unit
11 is geometrically symmetric, realizes the microwave absorbing property of stable polarization, and the metallic reflection of traditional absorbing material is substituted with frequency-selective surfaces 5
Plate realizes the good transmission characteristic of high frequency, and absorbent structure 1 is by 10 × 10 11 periodic arrangements of metal broken line unit in the present embodiment
It forms, arrangement period 17.2mm；Frequency-selective surfaces 5 are formed by 10 × 10 51 periodic arrangements of frequency-selective surfaces unit,
Its arrangement period is identical as the arrangement period of metal broken line unit 11；Upper dielectric-slab 2, froth bed 3 and lower dielectric-slab 4 are all made of side
The square plate of a length of 172mm, wherein the thickness of upper dielectric-slab 2 and lower dielectric-slab 4 is t=0.254mm, opposite dielectric
Constant is 2.2, and froth bed 3 is using relative dielectric constant and the comparable light-high-strength PMI foamed material of air, thickness H=
14mm。
Referring to Fig. 2, each metal broken line unit 11 is by four notched 111, four equiarms of " bow " font metal broken line
112, four the first Chip-Rs 113 of " L " type metal broken line and eight the second Chip-R 114 compositions, wherein four band notches
" bow " font metal broken line 111 replace with four equiarm " L " type metal broken lines 112 be connected, formed dead square structure, band lack
111 outward opening of " bow " font metal broken line of mouth, the geometric center position of notched " bow " the font metal broken line 111,
It is arranged jagged, which is loaded with the first Chip-R 113, and two of notched " bow " font metal broken line 111 are recessed
Groove center position, is each provided with a notch, and each indentation, there is loaded with the second Chip-R 114.Metal broken line unit 11
Metal line width W1=0.4mm；Two arm lengths of equiarm " L " type metal broken line 112 are L1=4.7mm；Notched " bow " word
Two recess widths of type metal broken line 111 are L2=1.6mm, and two depths of groove are L3=1.5mm, and notch length is equal
For L4=0.7mm, gap width is identical as metal line width；Four 113 resistance values of the first Chip-R are 10 ohm, eight second patches
114 resistance value of sheet resistance is 43 ohm.By adjusting the line width and length of metal broken line, the microwave absorbing property of absorbent structure can be optimized.
Referring to Fig. 3, frequency-selective surfaces unit 51 is formed by R × R 511 periodic arrangement of broken line slotted unit, wherein R >=
2, frequency selection surface cell 51 is formed by 4 × 4 511 periodic arrangements of broken line slotted unit in the present embodiment.
Referring to Fig. 4, broken line slotted unit 511 includes square patch and four arm helicla flutes, in the geometry of four arm helicla flutes
The heart is overlapped with the geometric center of square patch, is used to realize the high frequency of good stable polarization in the form of four arm helicla flutes
Transmission characteristic；Each arm of four arm helicla flutes is connected to form by a U-typed fluting 5111 and a line-styled fluting 5112,
Wherein, the bottom edge of each U-typed fluting 5111 of four arm helicla flutes is respectively parallel to the seamed edge of square patch, U-typed fluting
5111 opening direction in the counterclockwise direction, using clockwise direction has no significant effect integrally-built performance；Each " one "
Font fluting 5112 is parallel to the bottom edge of coupled U-typed fluting 5111.Line-styled fluting 5112 and broken line fluting are single
The seamed edge distance S1=0.25mm of member 511；The line of rabbet joint width of U-typed fluting 5111 and line-styled fluting 5112 is W2=
0.2mm, the length L5=1.9mm of line-styled fluting 5112；The galianconism length L8=0.4mm of U-typed fluting 5111, bottom side length
Spend L7=1.2mm, long arm lengths L6=2.2mm.By the adjustable in length high-frequency transmission for changing line-styled fluting 5112
Working frequency points.
The structure of embodiment 2 is identical as the structure of embodiment 1, and following parameter makes an adjustment：
The arrangement period of metal broken line unit 11 and frequency-selective surfaces unit 51 is 17mm；Upper dielectric-slab 2, froth bed
3 and lower dielectric-slab 4 be all made of the square plate that side length is 170mm, wherein the thickness of upper dielectric-slab 2 and lower dielectric-slab 4 is
T=0.2mm, relative dielectric constant 2.25；The metal line width W1=0.5mm of metal broken line unit 11；Equiarm " L " type metal folding
Two arm lengths of line 112 are L1=4.3mm；Two recess widths of notched " bow " font metal broken line 111 are L2
=1.5mm, notch length are L4=1mm；Eight 114 resistance values of the second Chip-R are 40 ohm；Line-styled fluting 5112
With the seamed edge distance S1=0.225mm of broken line slotted unit 511.
The structure of embodiment 3 is identical as the structure of embodiment 1, and following parameter makes an adjustment：
The arrangement period of metal broken line unit 11 and frequency-selective surfaces unit 51 is 16.2mm；Upper dielectric-slab 2, foam
Layer 3 and lower dielectric-slab 4 are all made of the square plate that side length is 162mm, wherein the thickness of upper dielectric-slab 2 and lower dielectric-slab 4 is equal
For t=0.2mm, relative dielectric constant 2.65；3 thickness H=15mm of froth bed；The metal line width W1=of metal broken line unit 11
0.5mm；Two arm lengths of equiarm " L " type metal broken line 112 are L1=4mm；Notched " bow " font metal broken line 111
Two recess widths are L2=1.5mm, and notch length is L4=1mm；Eight 114 resistance values of the second Chip-R are 40 Europe
Nurse；The seamed edge distance S1=0.125mm of line-styled fluting 5112 and broken line slotted unit 511.
Below in conjunction with l-G simulation test, technical effect of the invention is described further：
1, emulation content
1.1 S11 using business simulation software HFSS_13.0 to above-described embodiment 1 under the irradiation of not same polarization incidence wave
Simulation calculation is carried out with S21 parameter, as a result as shown in Figure 5.
1.2 inhale wave frequency under the irradiation of not same polarization incidence wave to above-described embodiment 1 using business simulation software HFSS_13.0
The absorptivity of band carries out simulation calculation, as a result as shown in Figure 6.
2, simulation result
Referring to Fig. 5, Fig. 5 (a) and Fig. 5 (b) respectively indicate material TE polarization and TM polarization incidence wave irradiation under S11 with
S21 curve graph.With S11≤ -10dB is standard, under not like-polarized incidence wave irradiation, the wideband of stable polarization in embodiment 1
Suction wavestrip width with absorbing material is 1.9~7.5GHz, and being computed relative bandwidth is 119%, and the suction wave frequency band of low-frequency range is obvious
Broadening, and polarizer stability is high.At high frequency 11GHz, designing material has good transmission characteristic, is applied on antenna communication
The radiance of antenna is influenced little.
It respectively indicates material referring to Fig. 6, Fig. 6 (a) and Fig. 6 (b) and polarizes under incidence wave irradiates in TE polarization and TM and inhale wave frequency
The absorbance curves figure of band.It can be seen from the figure that under not like-polarized incidence wave irradiation, stable polarization in embodiment 1
Broadband absorbing material is in the absorptivity for inhaling wave frequency band (1.9~7.5GHz) all 90% or more, and absorption band is wide, microwave absorbing property
By force, and there is polarizer stability.
The above simulation result explanation, the present invention have widened absorbing material under the premise of high frequency has good transmission characteristic
In the Absorber Bandwidth of low-frequency range, polarizer stability is high.
Above description is only three 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 broadband absorbing material of stable polarization, including absorbent structure (1), upper dielectric-slab (2), froth bed (3), lower Jie
Scutum (4) and frequency-selective surfaces (5), the absorbent structure (1) are printed on the upper surface of dielectric-slab (2), the frequency choosing
The lower surface that surface (5) is printed on lower dielectric-slab (4) is selected, the upper dielectric-slab (2), froth bed (3) and lower dielectric-slab (4) are successively
Arrangement, forms structure stacked on top of one another；It is characterized in that, the absorbent structure (1) is by M × N number of metal broken line unit (11) period
It arranges, each metal broken line unit (11) is rolled over by four " bow " font metal broken lines (111) and four equiarm " L " type metals
Line (112) is alternately connected, and forms dead square structure；The inside broken line of opening of " bow " the font metal broken line (111) and
One notch is respectively set on the broken line of two outward openings, and indentation, there is loaded with resistance, for realizing the broadband of stable polarization
Microwave absorbing property, wherein M >=3, N >=3；The frequency-selective surfaces (5) are arranged by M × N number of frequency-selective surfaces unit (51) period
It arranges, for realizing frequency transfer characteristic.
2. the broadband absorbing material of stable polarization according to claim 1, which is characterized in that the upper dielectric-slab (2)
With lower dielectric-slab (4), it is all made of the rectangular plate that relative dielectric constant is 2.2~2.65.
3. the broadband absorbing material of stable polarization according to claim 1, which is characterized in that the froth bed (3) is adopted
With relative dielectric constant and the comparable light-high-strength foamed material of air.
4. the broadband absorbing material of stable polarization according to claim 1, which is characterized in that the dead square knot
The notch being arranged on the broken line of structure, wherein bow " font metal broken line (111) opening inside broken line and two outward openings is located at
The center of broken line, the indentation, there load the first Chip-R (113) being open on inside broken line, the folding of two outward openings
Indentation, there on line loads the second Chip-R (114).
5. the broadband absorbing material of stable polarization according to claim 1, which is characterized in that the frequency-selective surfaces
Unit (51) is formed, wherein R >=2, the broken line slotted unit (511) by R × R broken line slotted unit (511) periodic arrangement
Including square patch and four arm helicla flutes, each arm of the four arms helicla flute is slotted (5111) and one by a U-typed
Line-styled fluting (5112) is connected to form, wherein the bottom edge difference of each U-typed fluting (5111) of four arm helicla flutes is parallel
In the seamed edge of square patch, each line-styled fluting (5112) is parallel to the bottom of coupled U-typed fluting (5111)
Side.
6. the broadband absorbing material of stable polarization according to claim 1, which is characterized in that the M × N number of metal folding
Line unit (11) and M × N number of frequency-selective surfaces unit (51), arrangement period is 16.2~17.2mm.
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