CN107404009A - Passband embedded type frequency selective wave absorber - Google Patents
Passband embedded type frequency selective wave absorber Download PDFInfo
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- CN107404009A CN107404009A CN201710771007.7A CN201710771007A CN107404009A CN 107404009 A CN107404009 A CN 107404009A CN 201710771007 A CN201710771007 A CN 201710771007A CN 107404009 A CN107404009 A CN 107404009A
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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
- H01Q17/008—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems with a particular shape
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Abstract
The invention provides a passband embedded type frequency selective wave absorber, which realizes remarkable wave absorption in both a high frequency band and a low frequency band outside a passband by embedding the passband between wave absorbing bands.
Description
Technical field
The present invention relates to electromagnetic protection technical field, is specifically related to a kind of passband embedded type frequency selection wave-absorber.
Background technology
Frequency selection wave-absorber (Frequency Selective Rasorber, FSR) has passband low-loss wave transparent, hinders
Band significantly inhales the spa-tial filter properties of ripple, can effectively reduce its radar while ensureing by safeguard global communication performance
Scattering resonance state (RCS), reaches stealthy purpose.
Earliest FSR occurs in the form of inhaling ripple wave transparent cover (absorptive/transmissive radome), the knot
Structure is the composite layered structure for the suction wave surface for including one layer of band logical FSS and one layer of resistive.Existing FSR structures will be by that will inhale ripple
The passband of body and inhale wavestrip frequency range and be provided separately, make the passbands of FSR structures positioned at inhaling below wavestrip or inhale wavestrip with super band, from
And reduce the ELECTROMAGNETIC REFLECTION inhaled in wavestrip frequency range.But the structure can form wider frequency gap between passband and suction wavestrip,
And with still having forceful electric power magnetoreflection in the frequency range of the symmetrical opposite side of passband centered on inhaling wavestrip.
The existing FSR structures with embedded type pass-band performance include passband layer, support foam and stopband layer.According to required filter
Wave property build equivalent circuit so as to obtain circuit parameter, afterwards on stopband layer load relevant parameter lump inductive reactive element and
Lumped impedance element is fitted equivalent circuit, so as to introduce bulky capacitor value and big inductance value into structure, to be filtered accordingly
Wave property.It is but higher by loading lump inductive reactive element cost.Induction reactance component in FSR application generally have not it is contemplated that
Encapsulation effect, easily influence FSR structures overall performance.
The content of the invention
It is an object of the invention to provide a kind of passband embedded type frequency to select wave-absorber, and the invention solves prior art
In harmful effect of the encapsulation effect of induction reactance component to wave-absorber overall performance is set up in FSR structures；Existing wave-absorber knot
The technical problem of strong electromagnetic reflection in the frequency range of structure passband side be present.
The present invention provides a kind of passband embedded type frequency selection wave-absorber, including：Sequentially the first stacked stopband layer, first
Dielectric layer, the second stopband layer, second dielectric layer, the 3rd dielectric layer and passband layer, passband layer are arranged at the bottom surface of the 3rd dielectric layer
On, passband layer includes the cross that central area is set and the housing being arranged at outside cross, and housing is that the length of side is 21.4mm's
Square；Cross includes cross body and the first kink being arranged in each freely extending end of cross body, second
Kink, the 3rd kink and the 4th kink, the first kink, the second kink, the 3rd kink and the 4th kink are
Open rectangular, protrudes from the arrangement of cross body in the counterclockwise direction, the first kink and the 3rd kink, the second kink and
Between the distance between the 4th kink it is equal, be 7.2mm, the first kink, the second kink, the 3rd kink and the 4th
Kink size is identical, width 2.8mm, length 3.8mm；The width of cross body any side is 1mm；First medium layer
Top surface on the first stopband layer is set, the second stopband layer is set on bottom surface, first, second stopband layer is the square that the length of side is p,
The pattern of the inner ring of the outer shroud for including closure and open circuit is set on the first stopband layer, and outer shroud includes square body and is arranged at just
Closed recess on four angles of square body, closed recess extension along the outside ring of this square body sidewall are formed, closed recess
In the counterclockwise direction in uniform outer shroud；Inner ring includes square body and the groove being opened on square four angles of body, leads to
Groove stretches arrangement to inner ring extension in the counterclockwise direction, and groove connects square body interior and outside；Second stopband layer is included just
Square stopband；The R that resistance is 90ohm is set in inner ring1, the R that resistance is 20ohm is set on outer shroud2。
Further, one end of groove is connected with the square body of inner ring, and another elongated end is opening, and groove is from interior
After the vertical inner ring square body of side wall of ring square body stretches out, the inner ring that parallel channels are close after bending is square
Body on one side, and stretches out and formed.
Further, the sideline width of outer shroud is 0.4mm, and the depth that closed recess is stretched into outer shroud is 5mm.
Further, the second stopband layer size：P is 25mm, b2For 4.6mm, w2For 0.8mm.
Further, the first stopband layer and the second stopband layer are square, length of side 25mm.
Further, the length of side of the first stopband layer inner ring square is 4.6mm, and the sideline width of inner ring is 0.8mm, groove
Interior groove width 0.2mm, a width of 0.3mm in sideline of groove, the square body of the inner ring of groove outer edge to the face groove
The distance in sideline is 8.5mm, and the length of groove is 4mm, and the length of side of outer shroud is 16mm, and the sideline width of outer shroud is 0.4mm, inner ring
Sideline width be 0.8mm, the depth of the closed recess of outer shroud is 5mm.
Further, passband layer size：a2For 21.4mm, l3For 7.2mm, l4For 2.8mm, l5For 3.8mm, w4For 1mm, w5
For 0.4mm.
The technique effect of the present invention：
Passband embedded type frequency provided by the invention selects wave-absorber, between passband is embedded in into suction wavestrip, so as to
Realized in the high band beyond passband and low-frequency range and significantly inhale ripple.
Passband embedded type frequency provided by the invention selects wave-absorber, is divided by loading resistor so as to be additionally arranged two frequency ranges
From it is independent inhale wavestrip, realize increase realize needed for filtering characteristic, the suction wavestrip of wave-absorber, passband set more flexible.Need not
Increase lump induction reactance device, save cost.
It specifically refer to the as follows of the various embodiments of the passband embedded type frequency selection wave-absorber proposition according to the present invention
Description, will be apparent in terms of the above and other for causing the present invention.
Brief description of the drawings
Fig. 1 is FSR stopband layer two-dimensional structure models (a) the first stopband layer of the present invention；B) the second stopband layer；
Fig. 2 is the FSR passband layer two-dimensional structure model schematics of the present invention；
Fig. 3 is the FSR 3-D solid structure model schematics of the present invention；
Fig. 4 is transmission coverage diagram (a) TE polarization (b) TM poles under not same polarization in the preferred embodiment of the present invention
Change；
Fig. 5 is the transmission coverage diagram schematic diagram under incidence angles degree in the preferred embodiment of the present invention.
Marginal data：
100th, the first stopband layer；110th, outer shroud；111st, closed recess；120th, inner ring；121st, groove；200th, first medium
Layer；300th, the second stopband layer；400th, second dielectric layer；500th, the 3rd dielectric layer；600th, passband layer；610th, housing；620th, cross
Frame body；631st, the first kink；632nd, the second kink；633rd, the 3rd kink；634th, the 4th kink.
Embodiment
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.
Referring to Fig. 3, passband embedded type frequency provided by the invention selects wave-absorber, including the first sequentially stacked stopband layer
100th, first medium layer 200, the second stopband layer 300, second dielectric layer 400, the 3rd dielectric layer 500 and passband layer 600.Passband layer
600 are arranged on the bottom surface of the 3rd dielectric layer 500.Include central area referring to Fig. 2 passbands layer 600 to set cross and be arranged at
Housing 610 outside cross.Housing 610 is square, length of side a2Less than the length of side p of the 3rd dielectric layer 500.The side of housing 610
Line width is w5.Cross includes the first elongated end on cross body 620 and cross body 620, the second elongated end, the
Three elongated ends and the 4th elongated end.Outwards horizontal-extending rear vertical-horizontal extension extends first elongated end side wall to outside cross
After form vertical stretch, continue to forming the first kink 631 (on cross elongated end away from vertical stretch is horizontal-extending
The kink structure of setting is identical, not tired herein to state).First kink 631 is open rectangular, and open rectangular herein refers to not
The rectangle of closing, not necessarily to form rectangular configuration.
Second kink 632 is set in second elongated end side wall.3rd kink 633 is set in the 3rd elongated end side wall.
4th kink 634 is set in the 4th elongated end side wall.First kink 631, the second kink 632, the and of the 3rd kink 633
4th kink 634 protrudes from cross body 620 and arranged in the counterclockwise direction.The size phase of first~the 4th kink 634
Together, illustrated herein by taking the first kink 631 as an example：The distance between first kink 631 and the 3rd kink 633 are
l3.The width of first kink 631 is l4.The length of first kink 631 is l5.The width of any side of cross body 620 is
w4。
The dielectric layer 500 of first medium layer 200 and the 3rd respectively Supporting Media of FSR stopbands layer and passband layer 600, material
Glass-epoxy (FR4) is selected, relative dielectric constant 2.2, thickness is 0.5mm.Second dielectric layer 400 is poly- first
Base acrylimide (PMI) foam, its relative dielectric constant is about 1.1, thickness 8.5mm.The thickness of second dielectric layer 400 is
According to the frequency range design compromise of two suction wavestrips of low frequency and high frequency, also as passband central frequency conducts a quarter of wavelength.
It can be seen in figure 3 that the at all levels of FSR structures is satisfied by rotational symmetry, the rotational symmetry of structure can ensure whole
The polarizer stability of body structure.
Passband layer 600 uses dual-attenuation structure, and outer shroud 110 and internal cross structure form two stopbands respectively, two
It is designed passband frequency range between stopband.The serpentine design of cross structure is position and stopband layer in order that two stopbands
The suction wavestrip position of design overlaps.Dimensional parameters in Fig. 2 are as shown in table 1.When the dimensional parameters difference of stopband layer design, lead to
The dimensional parameters of belt 600 need to adjust accordingly.
The dimensional parameters of table 1FSR passbands layer 600
| Dimensional parameters | a2 | l3 | l4 | l5 | w4 | w5 |
| It is worth (mm) | 21.4 | 7.2 | 2.8 | 3.8 | 1 | 0.4 |
Referring to Fig. 3, second dielectric layer 400 is set on the top surface of the 3rd dielectric layer 500, first is set in second dielectric layer 400
Dielectric layer 200.First stopband layer 100 is set on the top surface of first medium layer 200, the second stopband layer 300 is set on bottom surface.Referring to
Fig. 1 b) shown in, first, second stopband layer 300 is square, length of side p.The central area of second stopband layer 300 sets square
Shape stopband.The stopband length of side is b2.The width on each side is w2。
Referring to Fig. 1 a) the first stopband layer 100 central area set labyrinthine pattern stopband.Stopband pattern includes the outer of closure
Ring 110 and the inner ring 120 for being symmetricly set in open circuit in outer shroud 110.Resistance is respectively provided with the inner and outer rings 110 of stopband.Outer shroud 110
For square-shaped image, it is turned into a1, the closed recess extended into outer shroud 110 is respectively provided with the side wall at four angles of outer shroud 110
111.Closed recess 111 is distributed in outer shroud 110 in the counterclockwise direction, and sideline width is w1.Closed recess 111 stretches into outer shroud
Depth in 110 is l1。
The center of inner ring 120 is square body, and groove 121, square body are opened up on four angles of square body
Groove 121 on four angles extends arrangement to outside inner ring 120 in the counterclockwise direction.The structure of groove 121 is identical, below with any logical
Illustrated exemplified by groove 121.One end of groove 121 is connected with 120 square body of inner ring, and other end elongated end is opening.
After the vertical 120 square body of inner ring of side wall of groove 121 from 120 square body of inner ring stretches out, bend to parallel logical
The close 120 square body of inner ring of groove 121 on one side, and stretches out and formed.The length of side of 120 square body of inner ring is
b2, the width in each sideline is w2.Groove width s in groove 121, sideline width are w3.The outer edge of groove 121 is to the face groove 121
The distance in the square body sideline of inner ring 120 be b1.The length of groove 121 is l2。
Load on the resistance R in inner ring 1202Resistance is 20ohm, loads on the resistance R on outer shroud 1101Resistance is 90ohm.
Inside and outside, annular is two independent and misaligned suction wavestrips, and the suction wavestrip of outer shroud 110 is in compared with low-frequency range, inner ring
120 suction wavestrip is in higher frequency band.Outer shroud 110 is serpentine design, can make the reduction of its resonant frequency, makes the suction wavestrip of low-frequency range
Moved as far as possible to low frequency, the suction wavestrip separation between inner and outer rings 110.Inner ring 120 is double-decker, by setting upper first resistance
The stopband layer 300 of belt 100 and second, form interlayer becket and be coupled as electric capacity, while set on 120 4 angles of inner ring logical
Groove 121 can be equivalent to electric capacity, so as to adjust the band position that high frequency inhales wavestrip.
Preferably, the dimensional parameters in Fig. 1 are shown in Table 2, by the size in table 2, two on stopband layer can be made to inhale wavestrip and existed
Separation is optimal on frequency spectrum.
Table 2FSR stopband layer dimensional parameters
| Dimensional parameters | p | a1 | w1 | w2 | w3 |
| It is worth (mm) | 25 | 16 | 0.4 | 0.8 | 0.3 |
| Dimensional parameters | s | b1 | b2 | l1 | l2 |
| It is worth (mm) | 0.2 | 8.5 | 4.6 | 5 | 4 |
Below in conjunction with instantiation, method provided by the invention is described in detail.
Emulation is modeled to wave-absorber structure as shown in Figure 3 in simulation software CST, emulation uses periodic unit mould
Plate.Strip method device is selected, acquired results are analyzed as follows：
As can be seen from Figure 4 2.86GHz to 3.52GHz and 6.5GHz to 7.9GHz frequency range reflection coefficient and transmission
Coefficient is below -10dB, illustrates that the electromagnetic energy of incidence is largely lost in the frequency range, wave-absorber as provided by the invention
Possessed suction wavestrip, it is respectively 660MHz and 1.4GHz to inhale wavestrip bandwidth.The transmission in frequency range from 4.75GHz to 5.7GHz
Coefficient is more than -1dB, and reflectance factor is less than -10dB, passband possessed by wave-absorber as provided by the invention, and pass band width is
950MHz.Passband is between two inhale wavestrip, and the centre frequency of passband is located at 5.2GHz, and the insertion loss at this is less than
0.75dB.FSR provided by the invention passband is wider, and the Insertion Loss in passband rises and falls and is less than 0.25dB, very flat in passband.
Comparison diagram 4 (a) and the incident electromagnetic wave of the visible different polarised directions of Fig. 4 (b) have not significant impact to the characteristic curve of wave-absorber,
Illustrate that FSR provided by the invention possesses preferable polarizer stability.
As seen from Figure 5, when electromagnetic wave incident angle is less than 30 °, the passband of wave-absorber, the frequency range for inhaling wavestrip
Keep constant with bandwidth, FSR provided by the invention can keep ideal service behaviour, have preferable angle stabilization
Property.
Those skilled in the art will be clear that the scope of the present invention is not restricted to example discussed above, it is possible to which it is carried out
Some changes and modification, the scope of the present invention limited without departing from appended claims.Although oneself is through in accompanying drawing and explanation
Illustrate and describe the present invention in book in detail, but such explanation and description are only explanations or schematical, and it is nonrestrictive.
The present invention is not limited to the disclosed embodiments.
By to accompanying drawing, the research of specification and claims, when implementing of the invention, those skilled in the art can be with
Understand and realize the deformation of the disclosed embodiments.In detail in the claims, term " comprising " is not excluded for other steps or element,
And indefinite article "one" or " one kind " be not excluded for it is multiple.The some measures quoted in mutually different dependent claims
The fact does not mean that the combination of these measures can not be advantageously used.Any reference marker in claims is not formed pair
The limitation of the scope of the present invention.
Claims (7)
1. a kind of passband embedded type frequency selects wave-absorber, it is characterised in that including：Sequentially the first stacked stopband layer, first
Dielectric layer, the second stopband layer, second dielectric layer, the 3rd dielectric layer and passband layer, the passband layer are arranged at the 3rd medium
On the bottom surface of layer, the passband layer includes the cross that central area is set and the housing being arranged at outside the cross, described
Housing is the square that the length of side is 21.4mm；
The cross include cross body and be arranged in each freely extending end of cross body the first kink,
Second kink, the 3rd kink and the 4th kink, first kink, second kink, the 3rd bending
Portion and the 4th kink are open rectangular, protrude from the cross body arrangement in the counterclockwise direction, described first is curved
Folding part and the 3rd kink, second kink and between the distance between the 4th kink it is equal, be
7.2mm, first kink, second kink, the 3rd kink are identical with the 4th kink size, wide
Spend for 2.8mm, length 3.8mm；
The width of the cross body any side is 1mm；
The first stopband layer is set on the top surface of the first medium layer, the second stopband layer is set on bottom surface, described
First, the second stopband layer is the square that the length of side is p, and the inner ring of the outer shroud for including closure and open circuit is set on the first stopband layer
Pattern, the outer shroud includes square body and the closed recess that is arranged on described four angles of square body, described to close
Close groove and extend formation into the outer shroud along this described square body sidewall, the closed recess uniform institute in the counterclockwise direction
State in outer shroud；
The inner ring includes square body and the groove that is opened on described four angles of square body, and the groove is along the inverse time
Pin direction extends arrangement to outside the inner ring, and the groove connects the square body interior and outside；
The second stopband layer includes square stopband；
The R that resistance is 90ohm is set in the inner ring1, the R that resistance is 20ohm is set on the outer shroud2。
2. passband embedded type frequency according to claim 1 selects wave-absorber, it is characterised in that one end of the groove with
The square body of the inner ring is connected, and another elongated end is opening, and the groove is from the side of the inner ring square body
Wall is after vertically the inner ring square body stretches out, the close inner ring square body of the parallel groove after bending
On one side, and stretch out to be formed.
3. passband embedded type frequency according to claim 1 or 2 selects wave-absorber, it is characterised in that the side of the outer shroud
Line width is 0.4mm, and the depth that the closed recess is stretched into the outer shroud is 5mm.
4. passband embedded type frequency according to claim 1 or 2 selects wave-absorber, it is characterised in that second stopband
Layer size：P is 25mm, b2For 4.6mm, w2For 0.8mm.
5. passband embedded type frequency according to claim 1 or 2 selects wave-absorber, it is characterised in that first stopband
Layer and the second stopband layer are square, length of side 25mm.
6. passband embedded type frequency according to claim 1 or 2 selects wave-absorber, it is characterised in that first stopband
The length of side of layer inner ring square is 4.6mm, and the sideline width of the inner ring is 0.8mm, the groove width in the groove
0.2mm, a width of 0.3mm in sideline of the groove, the square of the inner ring of the groove outer edge to the face groove this
The distance in the sideline of body is 8.5mm, and the length of the groove is 4mm, and the length of side of the outer shroud is 16mm, the sideline of the inner ring
Width is 0.8mm.
7. passband embedded type frequency according to claim 1 or 2 selects wave-absorber, it is characterised in that the passband layer chi
It is very little：a2For 21.4mm, l3For 7.2mm, l4For 2.8mm, l5For 3.8mm, w4For 1mm, w5For 0.4mm.
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Cited By (7)
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| CN108270085A (en) * | 2018-03-05 | 2018-07-10 | 南京航空航天大学 | Inhale integrated frequency-selective surfaces structure thoroughly |
| CN111293441A (en) * | 2020-02-17 | 2020-06-16 | 南京航空航天大学 | Wave absorbing and transmitting integrated wave absorber |
| CN112467393A (en) * | 2020-12-08 | 2021-03-09 | 西安电子科技大学 | Dual-band RCS reduction super surface based on FSS and polarization rotation super surface |
| CN113300112A (en) * | 2021-05-17 | 2021-08-24 | 广东福顺天际通信有限公司 | Reflecting plate and reflector with switchable working states |
| CN113346250A (en) * | 2021-06-22 | 2021-09-03 | 重庆邮电大学 | Millimeter wave three-frequency selection surface based on multilayer coupling structure |
| CN114498047A (en) * | 2022-01-10 | 2022-05-13 | 西安电子科技大学 | Broadband low-RCS (radar cross section) super-surface structure based on scattering and absorption synergistic effect |
| CN114843725A (en) * | 2022-05-16 | 2022-08-02 | 江苏电子信息职业学院 | Ultra-wideband large-angle band-stop type frequency selection surface |
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Cited By (11)
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| CN108270085A (en) * | 2018-03-05 | 2018-07-10 | 南京航空航天大学 | Inhale integrated frequency-selective surfaces structure thoroughly |
| CN108270085B (en) * | 2018-03-05 | 2023-12-01 | 南京航空航天大学 | Suction-through integrated frequency selective surface structure |
| CN111293441A (en) * | 2020-02-17 | 2020-06-16 | 南京航空航天大学 | Wave absorbing and transmitting integrated wave absorber |
| CN111293441B (en) * | 2020-02-17 | 2021-05-25 | 南京航空航天大学 | Wave absorbing and transmitting integrated wave absorber |
| CN112467393A (en) * | 2020-12-08 | 2021-03-09 | 西安电子科技大学 | Dual-band RCS reduction super surface based on FSS and polarization rotation super surface |
| CN112467393B (en) * | 2020-12-08 | 2022-04-19 | 西安电子科技大学 | Dual-band RCS reduction super surface based on FSS and polarization rotation super surface |
| CN113300112A (en) * | 2021-05-17 | 2021-08-24 | 广东福顺天际通信有限公司 | Reflecting plate and reflector with switchable working states |
| CN113346250A (en) * | 2021-06-22 | 2021-09-03 | 重庆邮电大学 | Millimeter wave three-frequency selection surface based on multilayer coupling structure |
| CN114498047A (en) * | 2022-01-10 | 2022-05-13 | 西安电子科技大学 | Broadband low-RCS (radar cross section) super-surface structure based on scattering and absorption synergistic effect |
| CN114843725A (en) * | 2022-05-16 | 2022-08-02 | 江苏电子信息职业学院 | Ultra-wideband large-angle band-stop type frequency selection surface |
| CN114843725B (en) * | 2022-05-16 | 2023-11-03 | 江苏电子信息职业学院 | Ultra-wideband wide-angle band-stop type frequency selective surface |
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