CN110098488A - A kind of mode method for transformation on the super surface low RCS based on the feature theory of modules - Google Patents
A kind of mode method for transformation on the super surface low RCS based on the feature theory of modules Download PDFInfo
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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
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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Abstract
The invention belongs to electromagnetic technology fields, it is related to a kind of low radar scattering cross section, more particularly to a kind of mode method for transformation on super surface low RCS based on the feature theory of modules, it is characterized in that: at least including the following steps: step 1: according to feature modular curve of one piece of the character modules theoretical calculation super surface subelement (3) under the conditions of Motionless electromagnetic wave is incident；Step 2: the super surface subelement (3) according to obtained in step 1 carries out 4 × 4 array arrangement；Step 3, the super surface subarray (4) step 2 obtained rotates the symmetry arrangement that subarray carries out 2 × 2, forms the super surface array (5) with RCS Reduce shrinkage effect.It proposes a kind of experience without relying on designer, the design of the super surface array of low RCS can be realized according to design cycle, to greatly accelerate design process, the mode method for transformation on the super surface low RCS based on the feature theory of modules of design cycle is shortened, it can super surface texture that is more intuitive, succinct, efficiently designing low RCS.
Description
Technical field
The invention belongs to electromagnetic technology fields, are related to a kind of low radar scattering cross section, and in particular to one kind is based on character modules
The mode method for transformation on the theoretical super surface low RCS.
Background technique
Radar cross section (RCS) is to measure the important physical amount of scatterer scattering power, it being capable of quantitatively characterizing target
Object, to the ability of some fixed-direction scattering electromagnetic wave energy, is to measure target scattering intensity in electromagnetic wave incident
Important parameter, radar cross section is smaller, and the concealment of target is better.The technology of target radar scattering cross-section is reduced at present
Generally include three kinds: i.e. load radar absorbing technology, profile optimization technology and active or passive cancellation techniques.Radar
Absorbing material can convert electromagnetic energy to the energy of other forms, and the RCS decrement of target is realized with this.Profile optimization skill
Its radar signal is deviateed the echo-signal for threatening direction or reducing radar by the shape of optimization aim by art.It is passive to offset
Technology is to generate the echo interferenceed with incoming wave using the passive stealth technology means such as distinctive appearance or material, with realize incoming wave and
Mutually offseting between echo；And active cancellation techniques be using equipped in target it is active offset electronic equipment, with generate be suitble to
The electromagnetic wave offseted weakens by destructive interference or eliminates back wave.
The super surface of artificial electromagnetic refers to that a kind of thickness is less than the artificial stratified material of wavelength.Usually, it is at one layer
The array with certain arrangement mode is formed using modes such as etching, printings on dielectric substrate.It may be implemented to shake to electromagnetic wave
The flexible Effective Regulation of the characteristics such as width, phase, polarization, communication mode.The method for being directed to the low super surface RCS at present is all based on
What the method for scattering cancellation was realized, belong to passive cancellation techniques.2007, M.Paquay et al. proposed a kind of by artificial magnetic conductance
Body structure and perfact conductor structure carry out the super surface texture of artificial electromagnetic of checkerboard type arrangement, by utilizing Artificial magnetic conductor structure
With perfact conductor structure phase phase difference 180o, with realize target RCS decrement.But the reflection of the same phase of Artificial magnetic conductor structure
Smaller bandwidth, so that RCS reduces Bandwidth-Constrained.In order to broaden RCS decrement bandwidth, A.Y.Modi in 2016 et al. proposes to be based on two
The chessboard type structure of kind artificial magnetic conductor.By protecting the reflected phase difference of two kinds of Artificial magnetic conductor structures in wider frequency band
180 ° ± 37 ° are held, to realize the super surface design of wide band low RCS.But this method the problem is that, in super table
It is difficult intuitively to connect reflected phase and super surface texture in the design process of face unit, can not clearly reflects
The working mechanism of super surface texture, therefore design process more depends on the experience of designer, needs by being constantly trying to
Satisfactory super surface subelement can be designed, to cause being significantly increased for entire design process time cost.
Summary of the invention
It is an object of the invention in view of the above shortcomings of the prior art, propose a kind of warp without relying on designer
It tests, is shortened according to the design that the super surface array of low RCS can be realized in design cycle to greatly accelerate design process
The mode method for transformation on the super surface low RCS based on the feature theory of modules of design cycle, it can be more intuitive, succinct, efficient
Design the super surface texture of low RCS.
To achieve the above object, the technical scheme is that a kind of super surface low RCS based on the feature theory of modules
Mode method for transformation, it is characterized in that: at least including the following steps:
Step 1: according to feature of one piece of the character modules theoretical calculation super surface subelement 3 under the conditions of Motionless electromagnetic wave is incident
Modular curve makes the size of super surface subelement 3, shape can be realized mode conversion in working band；
Step 2: the super surface subelement 3 according to obtained in step 1 carries out 4 × 4 array arrangement, forms super surface submatrix
Column 4；Feature modular curve of the foundation super surface subarray 4 of character modules theoretical calculation under the conditions of Motionless electromagnetic wave is incident, and foundation
Feature mode analysis result in working frequency range optimizes the structure size of super surface subarray 4, real in working frequency range
Existing mode conversion；
Step 3, the super surface subarray 4 step 2 obtained rotates the symmetry arrangement that subarray carries out 2 × 2, shape
At the super surface array 5 with RCS Reduce shrinkage effect.
The step 1 comprises the following specific steps that:
Feature modular curve of one piece of super surface subelement 3 under the conditions of Motionless electromagnetic wave is incident 1a) is calculated, according to mode exhibition
The amplitude curve of open system number determines the main incentive mode of super surface subelement 3；
The characteristic current for 2a) extracting above-mentioned super surface subelement 3, generates characteristic current vector distribution map；
3a) obtained in conjunction with the phase curve of the characteristic current vector distribution map of main incentive mode and its mode expansion coefficient
Synthesis model current phasor to main incentive mode is distributed, and the structure size for adjusting super surface subelement 3 makes it in work frequency
Implementation pattern conversion in section.
The Motionless electromagnetic wave incidence condition refers to the electromagnetic field vertical incidence known to intensity, polarization etc..
The main incentive mode is that the size of foundation mode expansion coefficient is determined, if in same working frequency points
There is the corresponding mode expansion coefficient of a mode much larger than mode expansion coefficient corresponding to other modes, then the mode is main
Incentive mode.
The synthesis model current phasor distribution is by the mode current distribution of main incentive mode and corresponding mode
Expansion coefficient phase determines, when the mode expansion coefficient phase of main incentive mode is at -90o~section 90o, corresponding mould
Formula current distribution remains unchanged, and when main incentive mode mode expansion coefficient phase 90 °~180 ° or -180 °~-
When 90 ° of sections, corresponding mode current direction is reversed, and the main incentive mode after all consideration phases is superimposed synthesis, thus
Obtain the distribution of synthesis model current phasor.
The described mode conversion refer to the polarization direction of the scattered field that the synthesis model electric current of main incentive mode generates with
The polarization direction of incident electromagnetic field is orthogonal namely backscatter mode is with incident mode realizes mode rotation.
The step 2 includes:
2a) the super surface subelement 3 obtained according to step 1 carries out array arrangement to it and forms super surface subarray 4, and right
Super surface subarray 4 carries out feature mode analysis；
2b) according to 2a) in after feature mode analysis obtained mode expansion coefficient amplitude curve judge in working frequency range
Main incentive mode；
The corresponding characteristic current of main incentive mode 2c) is extracted, characteristic current vector distribution map is generated；
2d) obtained in conjunction with the phase curve of the characteristic current vector distribution map of main incentive mode and its mode expansion coefficient
To the synthesis model current distribution of main incentive mode, the structure size for optimizing super surface subelement 3 forms super surface subarray
4, so that super surface subarray 4 is can be realized mode conversion in working frequency range.
The step 3 includes: with its center by super surface subarray 4 according to 90 °, 180 °, and 270 ° of angle carries out suitable
Hour hands rotation, acquired postrotational 3 super surface subarrays are arranged into a manner of central symmetry together with super surface subarray 4
2 × 2 array obtains the super surface array 5 with RCS Reduce shrinkage effect, and the super surface array 5 with RCS Reduce shrinkage effect can
Low RCS characteristic is realized in above-mentioned mode conversion frequency range.
The invention has the following advantages:
1. the present invention is to realize the design method of the super surface array of low RCS based on the feature theory of modules, pass through feature mode
Analysis, can be to the synthesis model current distribution of incentive mode main on excess of export surface texture, thus set by clearly disclosing
Count the operating mode and mechanism of super surface array.
2. compared with prior art, The present invention gives the design cycle of the super surface array of a general low RCS,
Without relying on the experience of designer, the design of the super surface array of low RCS can be realized according to design cycle, thus significantly
Design process is accelerated, the design cycle is shortened.
Detailed description of the invention
Fig. 1 is flow chart of the embodiment of the present invention；
Fig. 2 is the mode expansion coefficient amplitude curve of super surface subelement 3 in the present invention；
Fig. 3 is the mode expansion coefficient phase curve of super surface subelement 3 in the present invention；
Fig. 4 (a) is the mode current distribution situation of super surface subelement 3 mode 1 at 9GHz；
Fig. 4 (b) is the mode current distribution situation of super surface subelement 3 mode 2 at 9GHz；
Fig. 5 (a) is the mode current distribution situation of super surface subelement 3 mode 1 at 11GHz；
Fig. 5 (b) is the mode current distribution situation of super surface subelement 3 mode 2 at 11GHz；
Fig. 6 (a) is the mode current distribution situation of super surface subelement 3 mode 1 at 17GHz；
Fig. 6 (b) is the mode current distribution situation of super surface subelement 3 mode 2 at 17GHz；
Fig. 7 (a) is the mode current distribution situation of super surface subelement 3 mode 1 at 21GHz；
Fig. 7 (b) is the mode current distribution situation of super surface subelement 3 mode 2 at 21GHz；
Fig. 8 (a) is the mode current distribution situation of super surface subelement 3 mode 1 at 23GHz；
Fig. 8 (b) is the mode current distribution situation of super surface subelement 3 mode 2 at 23GHz；
Fig. 9 is the mode expansion coefficient amplitude curve of super surface subarray 4 in the present invention；
Figure 10 is the mode expansion coefficient phase curve of super surface subarray 4 in the present invention；
Figure 11 (a) is the mode current distribution situation of super surface subarray 4 mode 2 at 7GHz；
Figure 11 (b) is the mode current distribution situation of super surface subarray 4 mode 6 at 7GHz；
Figure 12 (a) is the mode current distribution situation of super surface subarray 4 mode 2 at 9GHz；
Figure 12 (b) is the mode current distribution situation of super surface subarray 4 mode 6 at 9GHz；
Figure 13 (a) is the mode current distribution situation of super surface subarray 4 mode 2 at 13GHz；
Figure 13 (b) is the mode current distribution situation of super surface subarray 4 mode 6 at 13GHz；
Figure 14 (a) is the mode current distribution situation of super surface subarray 4 mode 2 at 21GHz；
Figure 14 (b) is the mode current distribution situation of super surface subarray 4 mode 6 at 21GHz；
Figure 15 (a) is the mode current distribution situation of super surface subarray 4 mode 2 at 23GHz；
Figure 15 (b) is the mode current distribution situation of super surface subarray 4 mode 6 at 23GHz；
Figure 16 (a) is super 3 layout structure schematic diagram top view of surface subelement；
Figure 16 (b) is super 3 layout structure schematic diagram side view of surface subelement；
Figure 17 (a) is super 4 layout structure figure top view of surface subarray；
Figure 17 (b) is super 4 layout structure figure side view of surface subarray；
Figure 18 (a) is the layout structure top view that mode converts super surface array 5；
Figure 18 (b) is the layout structure side view that mode converts super surface array 5；
Figure 19 is the structural schematic diagram with reference to metal floor 7；
Figure 20 is that the super surface array 5 and the mono- static RCS with reference to metal floor 7 with RCS Reduce shrinkage effect change with frequency
Contrast curve chart.
In figure, 1. metal patch units；2.Rogers5880 medium substrate；3. surpass surface subelement；4. surpass surface submatrix
Column；5. the super surface array with RCS Reduce shrinkage effect；6. metal floor；7. referring to metal floor.
Specific embodiment
In order to clarify the objects, technical solutions and advantages of the present invention, below in conjunction with the drawings and specific embodiments
The present invention is described in further detail:
In order to absolutely prove inventive concept, need to illustrate: the feature theory of modules in the present invention, which is shown in, refers to Ha Lindeng in 1971
Year is introduced in document ' Theory of Characteristic Modes for Conducting Bodies '.
As shown in Figure 1, a kind of mode method for transformation on the super surface low RCS based on the feature theory of modules, includes at least following
Step:
Step 1: according to feature of one piece of character modules theoretical calculation super surface subelement under the conditions of Motionless electromagnetic wave is incident
Modular curve makes the size of super surface subelement, shape can be realized mode conversion in working band；
The step 1 includes:
Feature modular curve of one piece of super surface subelement 3 under the conditions of Motionless electromagnetic wave is incident 1a) is calculated, according to mode exhibition
The amplitude curve of open system number determines the main incentive mode of super surface subelement 3；
The characteristic current for 2a) extracting above-mentioned super surface subelement 3, generates characteristic current vector distribution map；
3a) obtained in conjunction with the phase curve of the characteristic current vector distribution map of main incentive mode and its mode expansion coefficient
Synthesis model current phasor to main incentive mode is distributed, and the structure size for adjusting super surface subelement 3 makes it in work frequency
Implementation pattern conversion in section.
The final structure size for determining super surface subelement, as shown in figure 16, the long axis from the horizontal by 45 ° of angles is
5.2mm, short axle are that the oval metal chip unit 1 of 1.4mm is printed on 10mm × 10mm × 3.2mm size
On Rogers5880 medium substrate 2, the lower section of Rogers5880 medium substrate 2 is metal floor 6.
By feature modular curve of the super surface subelement of character modules theoretical calculation under the conditions of x polarized electromagnetic wave is incident, according to
The main incentive mode in working frequency range is judged according to the amplitude curve of mode expansion coefficient.The mode expansion of super surface subelement 3
For coefficient amplitude curve as shown in Fig. 2, in the working frequency range of 7-23GHz, mode 1 is remote with the mode expansion coefficient amplitude of mode 2
Greater than other modes, thus mode 1 and mode 2 are main excitation of super surface subelement under the conditions of x polarized electromagnetic wave is incident
Mode.Extract the characteristic current of mode 1 and mode 2 such as figure at five frequency points of 9GHz, 11GHz, 17GHz, 21GHz and 23GHz
Shown in 4- Fig. 8, (the mode current distribution situation of the super surface subelement 3 of Fig. 4 (a) mode 1 at 9GHz；Super surface of Fig. 4 (b)
The mode current distribution situation of the mode 2 at 9GHz of unit 3；Fig. 5 (a) is the mould of the super mode 1 at 11GHz of surface subelement 3
Formula current distributions；Fig. 5 (b) is the mode current distribution situation of super surface subelement 3 mode 2 at 11GHz；Fig. 6 (a) is
The mode current distribution situation of super surface subelement 3 mode 1 at 17GHz；Fig. 6 (b) is super surface subelement 3 at 17GHz
The mode current distribution situation of mode 2；Fig. 7 (a) is the mode current distribution feelings of the super mode 1 at 21GHz of surface subelement 3
Condition；Fig. 7 (b) is the mode current distribution situation of super surface subelement 3 mode 2 at 21GHz；Fig. 8 (a) is super surface subelement
3 at 23GHz mode 1 mode current distribution situation；Fig. 8 (b) is the mode electricity of the super mode 2 at 23GHz of surface subelement 3
Flow distribution situation.) and binding pattern expansion coefficient phase curve such as Fig. 3, obtain the synthesis model electric current at this five frequency points
Distribution.As can be seen that the mode expansion coefficient phase of mode 1 is in -180 °~-90 ° sections, corresponding mould at 9GHz frequency point
Formula current direction is reversed.For the mode expansion coefficient phase of mode 2 in -90 °~90 ° sections, corresponding mode current direction is constant.
Will consider phase after mode 1 and mode 2 be superimposed after obtain synthesis model current phasor distribution, current direction in the x-direction, with
Incidence wave polarization direction is consistent, non-emergence pattern conversion at the frequency point.At 11GHz frequency point, the mode expansion coefficient phase of mode 1
In 90 °~180 ° sections, corresponding mode current direction is reversed for position.The mode expansion coefficient phase of mode 2 is in -90 °~90 ° areas
Between, corresponding mode current direction is constant.Synthesis model electric current arrow will be obtained after mode 1 and the superposition of mode 2 after consideration phase
Amount distribution, current direction is in the y-direction, orthogonal with incidence wave polarization direction, and emergence pattern converts at the frequency point.In 17GHz frequency
At point, for the mode expansion coefficient phase of mode 1 in 90 °~180 ° sections, corresponding mode current direction is reversed, the mould of mode 2
For formula expansion coefficient phase in -90 °~90 ° sections, corresponding mode current direction is constant, it will be considered that mode 1 and mould after phase
Formula 2 obtains the distribution of synthesis model current phasor after being superimposed, current direction is in the y-direction, orthogonal with incidence wave polarization direction, should
Emergence pattern converts at frequency point.At 21GHz frequency point, the mode expansion coefficient phase of mode 1 corresponds in 90 °~180 ° sections
Mode current direction it is reversed, the mode expansion coefficient phase of mode 2 is in -180 °~-90 ° sections, corresponding mode current side
To reversed, it will be considered that mode 1 and mode 2 after phase obtain the distribution of synthesis model current phasor after being superimposed, current direction is along y
Direction, orthogonal with incidence wave polarization direction, emergence pattern converts at the frequency point.At 23GHz frequency point, the mode expansion of mode 1
For coefficient phase in 90 °~180 ° sections, corresponding mode current direction is reversed, and the mode expansion coefficient phase of mode 2 is at -90 °
~90 ° of sections, corresponding mode current direction are constant, it will be considered that mode 1 and mode 2 after phase obtain synthesis model after being superimposed
Current phasor distribution, current direction is in the x-direction, consistent with incidence wave polarization direction, non-emergence pattern conversion at the frequency point.Always
For, at 9GHz and 23GHz frequency point, synthesis model current direction is consistent with incidence wave, non-emergence pattern conversion；?
At the frequency point of 11GHz, 17GHz and 21GHz, synthesis model current direction is orthogonal with incidence wave, emergence pattern conversion.It may determine that
The frequency range of excess of export surface subelement mode conversion is 11GHz-21GHz.
Step 2: the array arrangement that super surface subelement 3 carries out 4 × 4 according to obtained in step 1 forms super surface submatrix
Column 4, feature modular curve of the foundation super surface subarray 4 of character modules theoretical calculation under the conditions of Motionless electromagnetic wave is incident, and foundation
Character modules analysis result in working frequency range optimizes the structure size of super surface subarray 4, and obtaining can be in work frequency
The super surface subarray of implementation pattern conversion in section.
Specifically comprise the following steps:
Super surface subarray 2a) is formed to its array arrangement for carrying out 4 × 4 according to the super surface subelement 3 that step 1 obtains
4, and feature mode analysis is carried out to surface subarray 4 the is surpassed；
2b) according to 2a) in after feature mode analysis obtained mode expansion coefficient amplitude curve judge in working frequency range
Main incentive mode；
The corresponding characteristic current of main incentive mode 2c) is extracted, characteristic current vector distribution map is generated；
2d) obtained in conjunction with the phase curve of the characteristic current vector distribution map of main incentive mode and its mode expansion coefficient
To the synthesis model current distribution of main incentive mode, optimizes the structure size of super surface subarray 4, make super surface subarray 4
It can be realized mode conversion in working frequency range.
The array arrangement that super surface subelement 3 carries out 4 × 4 is obtained into super surface subarray 4, optimizes exceeded face array 4
Structure size, make super surface subarray 4 can be realized in working frequency range mode conversion.Finally determine super surface subarray 4
Optimization structure it is as shown in figure 17, the long axis from the horizontal by 45 ° of angles is 5.2mm, short axle be 1.2mm ellipse gold
Belong to chip unit 1 to be printed on 40mm × 40mm × 3.2mm size Rogers5880 medium substrate 2.
The mode expansion coefficient amplitude curve of super surface subarray 4 is as shown in figure 9, in the working frequency range of 7-23GHz, mould
The mode expansion coefficient amplitude of formula 2 and mode 6 is much larger than other modes, is super surface subarray 4 in x polarized electromagnetic wave incidence item
Main incentive mode under part.Later, 2 and of mode at five frequency points of 7GHz, 9GHz, 13GHz, 21GHz and 23GHz is extracted
The characteristic current of mode 6 obtains the distribution of characteristic current vector, and (Figure 11 (a) is that super surface subarray 4 exists as shown in figs. 11 and 15
The mode current distribution situation of mode 2 at 7GHz；Figure 11 (b) is the mode current of the super mode 6 at 7GHz of surface subarray 4
Distribution situation；Figure 12 (a) is the mode current distribution situation of super surface subarray 4 mode 2 at 9GHz；Figure 12 (b) is super table
The mode current distribution situation of the mode 6 at 9GHz of face array 4；Figure 13 (a) is the super mode at 13GHz of surface subarray 4
2 mode current distribution situation；Figure 13 (b) is the mode current distribution situation of super surface subarray 4 mode 6 at 13GHz；Figure
14 (a) be the mode current distribution situation of super surface subarray 4 mode 2 at 21GHz；Figure 14 (b) is that super surface subarray 4 exists
The mode current distribution situation of mode 6 at 21GHz；Figure 15 (a) is the mode current of the super mode 2 at 23GHz of surface subarray 4
Distribution situation；Figure 15 (b) is the mode current distribution situation of super surface subarray 4 mode 2 at 23GHz)；And binding pattern exhibition
The phase curve of open system number is as shown in Figure 10, obtains synthesis model current distribution.As can be seen that at 7GHz frequency point, mode 2
For mode expansion coefficient phase in 90 °~180 ° sections, corresponding mode current direction is reversed, the mode expansion coefficient phase of mode 6
In 90 °~180 ° sections, corresponding mode current direction is reversed for position, it will be considered that mode 2 and mode 6 after phase obtain after being superimposed
The distribution of synthesis model current phasor, current direction is in the x-direction, consistent with incidence wave polarization direction, and mould does not occur at the frequency point
Formula conversion.At 9GHz frequency point, the mode expansion coefficient phase of mode 2 is in 90 °~180 ° sections, corresponding mode current side
To reversed, for the mode expansion coefficient phase of mode 6 in -90 °~90 ° sections, corresponding mode current direction is constant, it will be considered that
Mode 2 after phase and mode 6 obtain the distribution of synthesis model current phasor after being superimposed, current direction in the y-direction, with incidence
Wave polarization direction is orthogonal, and emergence pattern converts at the frequency point.At 13GHz frequency point, the mode expansion coefficient phase of mode 2-
90 °~90 ° sections, corresponding mode current direction is constant, and the mode expansion coefficient phase of mode 6 is right in -90 °~90 ° sections
The mode current direction answered is constant, it will be considered that mode 2 and mode 6 after phase obtain synthesis model current phasor point after being superimposed
Cloth, current direction is in the y-direction, orthogonal with incidence wave polarization direction, and emergence pattern converts at the frequency point.At 21GHz frequency point,
For the mode expansion coefficient phase of mode 2 in 90 °~180 ° sections, corresponding mode current direction is reversed, the mode exhibition of mode 6
Coefficient phase is opened in -180 °~-90 ° sections, corresponding mode current direction is reversed, it will be considered that mode 2 and mode 6 after phase
The distribution of synthesis model current phasor is obtained after superposition, current direction is in the y-direction, orthogonal with incidence wave polarization direction, the frequency point
Locate emergence pattern conversion.At 23GHz frequency point, the mode expansion coefficient phase of mode 2 is in -90 °~90 ° sections, corresponding mould
Formula current direction is constant, and for the mode expansion coefficient phase of mode 6 in -90 °~90 ° sections, corresponding mode current direction is constant,
Will consider phase after mode 2 and mode 6 be superimposed after obtain synthesis model current phasor distribution, current direction in the x-direction, with
Incidence wave polarization direction is consistent, non-emergence pattern conversion at the frequency point.Generally speaking, at 7GHz and 23GHz frequency point, mould is synthesized
Formula current direction is consistent with incidence wave, non-emergence pattern conversion；At the frequency point of 9GHz, 13GHz and 21GHz, synthesis model electricity
It is orthogonal with incidence wave to flow direction, emergence pattern conversion.So, it can be determined that the frequency of 4 implementation pattern of excess of export surface subarray conversion
Rate range is 9GHz-21GHz.
Step 3, the super surface subarray 4 step 2 obtained rotates the symmetry arrangement that subarray carries out 2 × 2, is formed
Super surface array 5 with RCS Reduce shrinkage effect.
By super surface subarray 4 with its center according to 90 °, 180 °, 270 ° of angle is rotated clockwise, acquired rotation
3 super surface subarrays after turning are arranged into 2 × 2 array with super surface subarray 4 in a manner of central symmetry together, are had
There is the super surface array 5 of RCS Reduce shrinkage effect, such as Figure 18.With reference to gold shown in comparison designed super surface subarray 5 and Figure 19
The RCS curve of possession plate 7, as shown in figure 20, it can be seen that (mode conversion frequency range), which realizes, in 7-21GHz frequency range is more than
The RCS Reduce shrinkage effect of 10dB.
Claims (8)
1. a kind of mode method for transformation on the super surface low RCS based on the feature theory of modules, it is characterized in that: including at least following step
It is rapid:
Step 1: according to character modules of one piece of the character modules theoretical calculation super surface subelement (3) under the conditions of Motionless electromagnetic wave is incident
Curve makes size, the shape of super surface subelement (3) can be realized mode conversion in working band；
Step 2: the super surface subelement (3) according to obtained in step 1 carries out 4 × 4 array arrangement, forms super surface subarray
(4)；According to feature modular curve of the super surface subarray (4) of character modules theoretical calculation under the conditions of Motionless electromagnetic wave is incident, and according to
The structure size of super surface subarray (4) is optimized according to the feature mode analysis result in working frequency range, in working frequency range
Interior implementation pattern conversion；
Step 3, the super surface subarray (4) step 2 obtained rotates the symmetry arrangement that subarray carries out 2 × 2, forms tool
There is the super surface array (5) of RCS Reduce shrinkage effect.
2. a kind of mode method for transformation on super surface low RCS based on the feature theory of modules according to claim 1, feature
Be: the step 1 comprises the following specific steps that:
Feature modular curve of one piece of super surface subelement (3) under the conditions of Motionless electromagnetic wave is incident 1a) is calculated, according to mode expansion
The amplitude curve of coefficient determines the main incentive mode of super surface subelement (3)；
The characteristic current for 2a) extracting above-mentioned super surface subelement (3), generates characteristic current vector distribution map；
3a) led in conjunction with the phase curve of the characteristic current vector distribution map of main incentive mode and its mode expansion coefficient
The synthesis model current phasor of incentive mode is wanted to be distributed, the structure size for adjusting super surface subelement (3) makes it in working frequency range
Interior implementation pattern conversion.
3. a kind of mode method for transformation on super surface low RCS based on the feature theory of modules according to claim 1, feature
Be: the Motionless electromagnetic wave incidence condition refers to the electromagnetic field vertical incidence known to intensity, polarization etc..
4. a kind of mode method for transformation on super surface low RCS based on the feature theory of modules according to claim 2, feature
Be: the main incentive mode is that the size of foundation mode expansion coefficient is determined, if having one in same working frequency points
The corresponding mode expansion coefficient of a mode is much larger than mode expansion coefficient corresponding to other modes, then the mode is main excitation
Mode.
5. a kind of mode method for transformation on super surface low RCS based on the feature theory of modules according to claim 2, feature
Be: the synthesis model current phasor distribution is by the mode current distribution of main incentive mode and corresponding mode expansion system
Number phase determines that, when the mode expansion coefficient phase of main incentive mode is at -90 °~90 ° of sections, corresponding mode current is divided
Cloth remains unchanged, and when the mode expansion coefficient phase of main incentive mode is in 90 °~180 ° or -180 °~-90 ° sections
When, corresponding mode current direction is reversed, the main incentive mode after all consideration phases is superimposed synthesis, to be synthesized
The distribution of mode current vector.
6. a kind of mode method for transformation on super surface low RCS based on the feature theory of modules according to claim 1, feature
Be: the mode conversion refers to the polarization direction for the scattered field that the synthesis model electric current of main incentive mode generates and enters radio
The polarization direction in magnetic field is orthogonal namely backscatter mode is with incident mode realizes mode rotation.
7. a kind of mode method for transformation on super surface low RCS based on the feature theory of modules according to claim 1, feature
Be: the step 2 includes:
Array arrangement 2a) is carried out to it according to the super surface subelement (3) that step 1 obtains and forms super surface subarray (4), and is right
Super surface subarray (4) carries out feature mode analysis；
2b) according to 2a) in after feature mode analysis obtained mode expansion coefficient amplitude curve judge it is main in working frequency range
Incentive mode；
The corresponding characteristic current of main incentive mode 2c) is extracted, characteristic current vector distribution map is generated；
2d) led in conjunction with the phase curve of the characteristic current vector distribution map of main incentive mode and its mode expansion coefficient
The synthesis model current distribution of incentive mode is wanted, the structure size for optimizing super surface subelement (3) forms super surface subarray
(4), super surface subarray (4) is made to can be realized mode conversion in working frequency range.
8. a kind of mode method for transformation on super surface low RCS based on the feature theory of modules according to claim 1, feature
Be: the step 3 includes: with its center by super surface subarray (4) according to 90 °, 180 °, and 270 ° of angle carries out clockwise
Rotation, acquired postrotational 3 super surface subarrays and super surface subarray (4) are arranged into 2 in a manner of central symmetry together
× 2 array obtains the super surface array (5) with RCS Reduce shrinkage effect, super surface array (5) energy with RCS Reduce shrinkage effect
It is enough to realize low RCS characteristic in above-mentioned mode conversion frequency range.
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