CN110414111A - A kind of non-equal periods frequency-selective surfaces design method of double screen - Google Patents
A kind of non-equal periods frequency-selective surfaces design method of double screen Download PDFInfo
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- CN110414111A CN110414111A CN201910657731.6A CN201910657731A CN110414111A CN 110414111 A CN110414111 A CN 110414111A CN 201910657731 A CN201910657731 A CN 201910657731A CN 110414111 A CN110414111 A CN 110414111A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a kind of non-equal periods frequency-selective surfaces design methods of double screen, belong to Electromagnetic Field and Microwave Technology field, are mainly used for the stealthing design of electronic equipment.It is that periodic boundary condition adds Floquet mode excitation technology for the design method that current FSS is widely used, though this method computational efficiency is high and calculated result is accurate, but there is certain limitation to the design of double screen FSS, require the FSS periodic unit of different layers that there is the period of same size, design freedom is caused to decline, it is difficult to reach the optimum performance of double screen FSS.The present invention relieves the limitation for requiring double screen FSS surface layers periodic unit that must have the same size period in traditional design method, increases design freedom, and design is made to be easier to reach specified performance.
Description
Technical field
The invention belongs to Electromagnetic Field and Microwave Technology fields.
Background technique
Frequency-selective surfaces (Frequency Selective Surface, FSS) technology is in the hidden of electronic information equipment
Body, dichroism major-minor reflecting surface, Circuit analogous absorber and polarizer design scheme in be widely used.FSS is that one kind exists
The structure formed on one-dimensional or two-dimensional surface by same unit periodic arrangement, thus at present the emulation design method that generally uses for
Periodic boundary condition adds Floquet mode excitation technology.This method computational efficiency is high and calculated result is accurate, but to double screen FSS
Design have certain limitation.This method requires the FSS periodic unit of different layers to have the period of same size, leads to design certainly
Declined by degree, it is difficult to reach the optimum performance of double screen FSS.It is current that document or patent of invention there is no to be related to setting for non-equal periods FSS
Meter method.The invention discloses the design methods of the non-equal periods FSS of double screen a kind of, overcome lacking for above-mentioned traditional design method
Point, so that the performance of double screen FSS is more excellent.
Summary of the invention
The invention discloses a kind of non-equal periods frequency-selective surfaces design methods of double screen, relieve in traditional design method
It is required that double screen FSS surface layers periodic unit there must be the limitation in same size period, design freedom is increased, makes design more
Easily reach specified performance.Specific design procedure is as follows:
Step 1: single layer FSS element characteristics is determined
It is required according to design objective, the frequency-selective surfaces periodic unit U for selecting two types suitable1,U2, particularly, two
Kind cell type can be identical, analyzes the relationship of its physical parameter and electrical property, selects the preferable physics ginseng of one group of Frequency Response
Number.Thereby determine that relativeness of each physical parameter relative to period size T in model.
Step 2: the corresponding relationship of cycle T Yu resonance frequency point is obtained by parameter scanning
Parameter scanning is carried out to cycle T, other physical parameters are determined by step 1 result in model.Pass through parameter scanning
Mode obtains the corresponding relationship of single layer FSS unit cycle T and resonance frequency point.
Step 3: two layers of FSS unit period sizes values T of selection1,T2
The corresponding bandwidth of different cycles size and resonance frequency point position are analyzed, two period sizes values T are selected1,T2, so that
Two kinds of models, that is, unit U1, cycle T1With unit U2, cycle T2Response curve superposition after substantially cover index request.
Step 4: T is determined1,T2And its proportionate relationship
The T selected according to step 31,T2Ratio cc=T1/T2Irreducible fraction m/n is found, so that m/n ≈ α, wherein m, n
For positive integer, the principle of selection is that m and n are as small as possible.Such as α=1.536, then m=3, n=2 may be selected.Then to T1,T2Two
Either one or two of parameter is modified, and T is still used after amendment1,T2It indicates, so that relationship nT1=mT2It is stringent to set up.
Step 5: double screen FSS periodic unit model is established
Establish double screen FSS model of element U3, wherein one layer is unit U1By cycle T1Make n × n arrangement, in addition one layer is single
First U2By cycle T2Make m × m arrangement.Unit U3Cycle T=nT1=mT2。
Step 6: fine-adjusting unit U3Physical parameter, complete design
The double screen FSS performance that step 1 to step 6 constructs substantially meets design objective requirement, further analytical unit U3
In each physical parameter (including T1,T2, but must satisfy nT1=mT2) with the relationship of electrical property, complete finally to meet index request
Design.
The present invention compared with art methods, the beneficial effect is that:
(i) allow in double screen FSS design, the size of two kinds of periodic units can be different, increase double screen frequency-selective surfaces
One degree of freedom in design finally makes programmable performance boundary higher.
(ii) allow the periodic unit of each layer frequency-selective surfaces to arrange closer, occur so as to cause graing lobe
More posteriorly, big incidence angle performance is more stable for frequency.
Detailed description of the invention
Fig. 1: frequency-selective surfaces square ring type periodic unit illustraton of model.
Unit Fig. 2: FSS presses cycle T2Make 3 × 3 arrangements.
Unit Fig. 3: FSS presses cycle T1Make 2 × 2 arrangements.
Fig. 4: non-equal periods double screen FSS model of element, P1、P2It is Floquet excitation port, PBC is periodic boundary condition.
Fig. 5: the frequency response characteristic that frequency-selective surfaces change with cycle T.
Fig. 6: period size T is determined by resonance frequency point position and bandwidth1And T2。
Fig. 7: non-equal periods double screen frequency-selective surfaces normal direction and wide-angle frequency response curve.
Specific embodiment
The present invention is further elaborated with technical solution with reference to the accompanying drawing, specific implementation process is as follows:
Design a kind of frequency-selective surfaces for hindering in X, Ku wave band band and working with time width angle.
Step 1: single layer FSS element characteristics is determined
Since the requirement of bandwidth is typically designed as double screen, selectable periodic unit is more, such as three leg loading units, six sides
Shape ring element, the unit of square ring element and various combining forms.It is U by taking square ring element as an example1=U2=side ring element, such as Fig. 1
It is shown, it analyzes the relationship of its physical parameter and electrical property first, selects one group of preferable physical parameter of Frequency Response, it is each in unit
Physical parameter is as follows relative to the relativeness of period size T: b=0.8T, w=0.06T, and such periodic unit only has an object
Manage parameter T.
Step 2: the corresponding relationship of periodic unit size Yu resonance frequency point is obtained by parameter scanning
The corresponding relationship of single layer FSS unit period size T and resonance frequency point, such as Fig. 5 are obtained by way of parameter scanning
It is shown.
Step 3: selection FSS unit period sizes values T1,T2
The corresponding bandwidth of different cycles size and resonance frequency point position are analyzed, two period sizes values T are selected1=
10.5mm,T2=7.5mm, so that the sound of the square ring element of the square ring element of two kinds of models, that is, period 10.5mm and period 7.5mm
Curve combining is answered substantially to cover index request later, as shown in Figure 6.
Step 4: T is determined1,T2And its proportionate relationship
According to the T of step 3 primary election1,T2Ratio T1/T2=1.4 find irreducible fraction m/n, can be with so that m/n ≈ 1.4
Select m=7, n=5.But in order to which m and n are as small as possible, m=3, n=2 can be enabled.Then relational expression nT is utilized1=mT2To T2Into
Row amendment, T2=nT1/ m=2*10.5mm/3=7mm.Above-mentioned relation formula and T can certainly be utilized2To T1It is modified, i.e. T1
=mT2/ n=3*7.5mm/2=11.25mm.Two kinds of situations are compared, T is corrected2It is more appropriate, because the value after amendment is compared with step
The initial value change of three selections is smaller.
Step 5: double screen FSS periodic unit model is established
Establish double screen FSS model of element U3, such as Fig. 4, wherein one layer is unit U1By cycle T1Make n × n arrangement (this example n=
2, as shown in Figure 3), in addition one layer is unit U2By cycle T2Make m × m arrangement (this example m=3, as shown in Figure 2).Unit U3Week
Phase is nT1=mT2。
Step 6: adjustment unit U3Each physical parameter, complete design
By periodic unit U in step 11,U2In each physical parameter replaced with its corresponding period sizes values, can be before design
Phase reduces design difficulty and guarantees the performance of unit to a certain extent.In T1,T2It, can further adjustment unit U after determination3
In each physical parameter, finally met the design of index request, as shown in Figure 7.
Claims (2)
1. a kind of non-equal periods frequency-selective surfaces design method of double screen, it is characterised in that:
Step 1: single layer FSS element characteristics is determined；It is required according to design objective, the frequency for selecting two types suitable selects table
Face periodic unit U1,U2, analyze its physical parameter, analyze the relationship of its physical parameter and electrical property, select one group of Frequency Response compared with
Good physical parameter thereby determines that relativeness of each physical parameter relative to period size T in model；
Step 2: the corresponding relationship of periodic unit size Yu resonance frequency point is obtained by parameter scanning；Parameter is carried out to cycle T to sweep
It retouches, other physical parameters are determined by step 1 result in model；Single layer FSS unit cycle T is obtained by way of parameter scanning
With the corresponding relationship of resonance frequency point；
Step 3: the periodic quantity T of two layers of FSS unit of selection1,T2；Analyze the corresponding bandwidth of different cycles size and resonance frequency point position
It sets, selects two period sizes values T1,T2, so that two kinds of models, that is, unit U1, cycle T1With unit U2, cycle T2Response curve
Index request is substantially covered after superposition；
Step 4: T is determined1,T2And its proportionate relationship；The T selected according to step 31,T2Ratio cc=T1/T2Searching can not reduce
Number m/n, so that m/n ≈ α, wherein m, n are positive integer；Then to T1,T2Either one or two of two parameters are modified, and are repaired
T is still used after just1,T2It indicates, so that relationship nT1=mT2It is stringent to set up；
Step 5: double screen FSS periodic unit model is established；Establish double screen FSS model of element U3, wherein one layer is unit U1By week
Phase T1Make n × n arrangement, in addition one layer is unit U2By cycle T2Make m × m arrangement；Unit U3Period be nT1, nT1=mT2；
Step 6: fine-adjusting unit U3Physical parameter, complete design；The double screen FSS performance that step 1 to step 6 constructs is substantially met
Design objective requirement, further analytical unit U3In each physical parameter and electrical property relationship, physical parameter includes T1,T2, it is necessary to
Meet nT1=mT2, complete the design for finally meeting index request.
2. the non-equal periods frequency-selective surfaces design method of double screen according to claim 1, it is characterised in that: the step
Frequency selects surface period unit U in one1,U2Type can be identical.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090058746A1 (en) * | 2007-08-31 | 2009-03-05 | Harris Corporation | Evanescent wave-coupled frequency selective surface |
| US20090125254A1 (en) * | 2007-11-13 | 2009-05-14 | Battelle Energy Alliance, Llc | Methods, computer readable media, and graphical user interfaces for analysis of frequency selective surfaces |
| CN106295038A (en) * | 2016-08-17 | 2017-01-04 | 大连理工大学 | A kind of active frequencies selects surface method for designing |
| CN108110418A (en) * | 2017-12-08 | 2018-06-01 | 中国船舶重工集团公司第七二四研究所 | A kind of frequency selection antenna house of broadband and wideangle work |
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- 2019-07-20 CN CN201910657731.6A patent/CN110414111B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090058746A1 (en) * | 2007-08-31 | 2009-03-05 | Harris Corporation | Evanescent wave-coupled frequency selective surface |
| US20090125254A1 (en) * | 2007-11-13 | 2009-05-14 | Battelle Energy Alliance, Llc | Methods, computer readable media, and graphical user interfaces for analysis of frequency selective surfaces |
| CN106295038A (en) * | 2016-08-17 | 2017-01-04 | 大连理工大学 | A kind of active frequencies selects surface method for designing |
| CN108110418A (en) * | 2017-12-08 | 2018-06-01 | 中国船舶重工集团公司第七二四研究所 | A kind of frequency selection antenna house of broadband and wideangle work |
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