CN108682963A - It is a kind of with ultra-high frequency than multi-band frequency select construction design method - Google Patents
It is a kind of with ultra-high frequency than multi-band frequency select construction design method Download PDFInfo
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- CN108682963A CN108682963A CN201810418330.0A CN201810418330A CN108682963A CN 108682963 A CN108682963 A CN 108682963A CN 201810418330 A CN201810418330 A CN 201810418330A CN 108682963 A CN108682963 A CN 108682963A
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- array
- frequency
- combination
- band
- multicycle
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0046—Theoretical analysis and design methods of such selective devices
Abstract
The invention discloses it is a kind of with ultra-high frequency than multi-band frequency select construction design method, select the cell array combination of multicycle combination array or different densities combination array, it is constraint with resonance frequency band, determine the cell parameters and corresponding units array parameter of the array element for participating in nested combination, determine the cell parameters and corresponding units array parameter of the array element for participating in nested combination, then each array element parameter for participating in nested combination and array element position are adjusted to meet topological integrity requirement, and the interior performance of band of the multicycle combination array/different densities combination array formed after finally being combined to the array element calculates verification, to solve the resonance frequency band distribution frequency narrow range that current resonant frequency bands type frequency selecting structures face, the interior poor performance problem of band of high-frequency resonant frequency band.
Description
Technical field
The present invention relates to communication and em filtering fields, relate more specifically to a kind of high-frequency ratio and high band internal transmission factor
(reflectivity) and with multiple resonance frequency bands frequency selecting structures design method.
Background technology
Resonant frequency bands type frequency selecting structures are a kind of electromagnetic element with multiple frequency selection windows, Neng Goushi
Total reflection or total transmissivity occur for the signal of existing multiple frequencies, hidden to be widely used in multifrequency antenna, multifrequency radar cover, synthesis
The fields such as body mast, multifrequency em filtering component.
In general, single band logical (resistance) can be obtained using the two-dimensional array structure with simple shape cell array
Frequency (total transmissivity occurs for also referred to as resonance frequency band, band logical, that is, signal, and band resistance is that signal is totally reflected), and it is single by using combination
Member, complex unit and multilayer frequency selecting structures are the methods of compound can then obtain multiple resonance frequency bands, wherein passing through simple shape
The method of shape cell array combination obtains a kind of method that multiband response is most universal, most basic.
It has been generally acknowledged that the cell array of resonance frequency band significant difference is combined, as long as can guarantee each list after combination
The gap (or conduction region) of element array can obtain multiple resonance frequency bands independently of each other, and complicated single based on assembled unit or multifrequency
Member forms array by single period profile or by certain Density Distribution come when obtaining multiple resonance frequency bands, due to by array
The limitation for the graing lobe frequency that period is determined, this mode cannot obtain the resonance frequency of multiple high quality in wider frequency range
Band：And array period corresponds to fixed graing lobe frequency, frequency selecting structures can be by graing lobe to other when being higher than graing lobe frequency
Direction radiates quite a few energy, and so as to cause performance decline in the resonance frequency band of upper frequency, (i.e. bandpass-type frequency selects structure
Passband in electromagnetic wave tansmittivity decline or stopband internal transmission factor with resistance type increases), to influence resonant frequency bands type frequency
Select the performance of structure.
Therefore, resonance frequency band distribution frequency narrow range, the interior poor performance of band of high-frequency resonant frequency band become resonant frequency bands type
The focus technology problem that frequency selecting structures generally face.
Invention content
Present invention aim to address the resonance frequency band distribution frequencies that current resonant frequency bands type frequency selecting structures face
Narrow range, the interior poor performance problem of band of high-frequency resonant frequency band.
To achieve the above object, the technical solution that the present invention applies is as follows.
It is a kind of with ultra-high frequency than multi-band frequency select construction design method, include the following steps：
Step 1, the design feature on applying frequency as needed selection surface, the combination of selecting unit array are that is, logical
Cross the period in multiple proportion cell array be nested to form different cycles cell array combination (multicycle combination array) or
(different densities combination array) is combined by the different densities cell array that is nested to form of the cell array of different densities, if needed
It wants applying frequency that the structure on surface is selected to be readily expanded as plane or carry out Mapping Design using plan frequency selection structure then to adopt
With multicycle combination array, otherwise recommend to use different densities combination array；
Step 2, the mechanical property requirements combination frequency response curve according in design requirement, incidence angle, polarization characteristic requirement, really
Determine medium, coated by dielectric form used by resonant frequency bands type frequency selecting structures and realizes the unit shape used in each frequency band
Formula；Preferential select is easy the high array element form of the tiling such as nested polygon, ring-like space availability ratio and conveniently fills up more
The branching type array element in gap between side shape, ring-like array element；
Step 3, for multicycle combination array, according to resonance frequency band centre frequency, bandwidth, the intermediate zone in design requirement
Width and determine each composition unit size parameter and array period with outer/reflectivity requirements；For different densities combination array,
According in design requirement resonance frequency band centre frequency, bandwidth, intermediate zone width and with outer/reflectivity requirements determine each composition
Unit size parameter and a period of time density；
Step 4, for multicycle combination array, component units array is combined, while adjusting topological structure to protect
The unit formed after card combination has topological integrity；For different densities combination array, according to design density parameter to a period of time
It arranges, each a period of time has topological integrity after ensureing to combine under the premise of meeting density parameter constraint；
Step 5 carries out emulation point to the electrical property for designing obtained multicycle combination array/different densities combination array
Analysis, design result is exported if meeting design requirement, otherwise returns to step 2.
Further, involved cell array has different resonance frequency bands, the difference of centre frequency in the step 3
>5% × centre frequency, and overlapping resonant frequency bands band<50% × smaller bandwidth.
Further, the basis for estimation that each unit array that is formed has topological integrity after being combined in the step 4 is：
The conductive layer gap of bandpass-type cell array or the cavity of 3 D stereo cell array are not connected to after nesting combines or are only stitching
It is connected at 0 point of gap or cavity magnetic current, the electric conductor of the conductive layer with resistance type cell array or 3 D stereo unit is combined in nesting
It is not connected to or is only connected at 0 point of surface current afterwards.
Further, in the step 5 the interior results of performance analysis of band of multicycle combination array with its grid in high frequency
Valve transmission coefficient is foundation；The interior results of performance analysis of band of different densities combination array with the local density of array element be according to
According to.
Compared with prior art, the present invention it has the advantages that：
1, the limit of graing lobe frequency is realized using the frequency selecting structures of multicycle combination array or different densities combination array
The breakthrough of system, can easily design has multiple high-performance (high band internal transmission factor/reflectivity, low in wider frequency range
Graing lobe scattering strength) resonance frequency band multifrequency frequency selecting structures.
2, the characteristics of being applied according to resonant frequency bands type frequency selecting structures proposes multicycle combination array/different densities
Two kinds of selectable structures of combination array are not only suitable for the frequency selecting structures design of two-dimensional surface, apply also for 3 D stereo
Frequency selecting structures design.
3, novel frequency selects structure when higher than its graing lobe frequency, and the energy that graing lobe is taken away is less than conventional combination array,
Electrical property is good in high-frequency resonance frequency band.
Description of the drawings
With reference to specific embodiment and attached drawing, invention is further described in detail.The example of the implementation is in attached drawing
In show, the embodiment described by reference to attached drawing is exemplary, and is only used for explaining technical scheme of the present invention, without should
It is interpreted as limitation of the present invention.
Fig. 1 is the comparison of the unit and the unit of traditional single cycle combination array of multicycle combination array, in figure a be can
Obtain the unit form of the conventional combination array of multiple resonance frequency bands, b is the list of multicycle combination array of the present invention in figure
N-ary form n, the period of small circular unit in two directions is the 1/2 of big circular unit in b.
Fig. 2 is the schematic diagram of multicycle combination array, wherein being two periods by the unit decomposition of multicycle combination array
At the sub-array units of 2 times of relationships.
Fig. 3 is that the identical multicycle combination array of a pair of of design parameter is selected with conventional combination array multi-band frequency
The transmission characteristic result of calculation of structure compares, and a gives the gap of multicycle combination array and traditional single cycle combination array
Unit defines, i.e., a length of 19mm of outer side edges of big square loop, a length of 5mm of outer side edges of small square loop, and slit width is
0.25mm is 20mm in the base cycle both direction of array；B be in a two kinds of periodic arrays in no coated by dielectric, normal incidence
Under the conditions of, the comparison of energy coefficient and transmission versus frequency situation of change that graing lobe is taken away, wherein 3b-1 are multicycle group combined arrays
Row as a result, 3b-2 is the result of traditional single cycle combination array.
It is 2mm, permittivity ε that Fig. 4, which is that two kinds of periodic arrays are embedded in a layer thickness in Fig. 3 a,r=3.8, tangent loss tan δ
When in=0.015 medium, under the conditions of normal incidence, pair of energy coefficient and transmission versus frequency situation of change that graing lobe is taken away
Than wherein 4-1 is multicycle combination array as a result, 4-2 is the result of traditional single cycle combination array.
Fig. 5 is a kind of schematic diagram of different densities combination array, the surface density of medium and small circular unit and big circular unit
The ratio between about 7.1.
Fig. 6 is the flow chart of the design method of resonant frequency bands type frequency selecting structures of the present invention.
Fig. 7 is a kind of double-layer frequency selective surfaces structural profile illustration, is the high-density medium of 1mm by two layers of thickness
The low-density medium composition of one layer of 30mm thickness of folder, periodic array are embedded in high-density medium middle；The dielectric of high-density medium is normal
Number εr=4.0, δ=0.015 tangent loss tan；The permittivity ε of low-density mediumr=1.1, δ=0.002 tangent loss tan.
Fig. 8 is a kind of multicycle combination array cell schematics of rectangle circular unit and cross unit composition；In figure,
Length on the outside of rectangle circular unit and wide respectively L and W, two period directions are orthogonal, and the period is respectively DuAnd Dv；Cross list
The length of member is l, and two periods are respectively Du1And Dv1；Unit interstices width is w.
Fig. 9 is a kind of double resonance frequency band bandpass-type frequency selecting structures in 15 ° of incidence angles, TE polarization plane electromagnetic wave irradiations
Under the conditions of frequency response characteristic, dash area is the frequency band of design requirement in figure.
Specific implementation mode：
With reference to specific embodiment and attached drawing, invention is further described in detail.The examples of the embodiments are attached
It is shown in figure, the embodiment described by reference to attached drawing is exemplary, and is only used for explaining technical scheme of the present invention, without answering
When being interpreted as limitation of the present invention.
Design requirement：A plane electromagnetic window requires 300~1000MHz and 3 ± 0.1GHz two on certain body-concealed mast
A band passband, band internal transmission factor>- 3dB, with outer transmissivity<- 20dB, intermediate zone<30% bandwidth；Working environment is incidence angle
± 30 °, horizontal polarization is subjected to 3g overloads (mechanical property requirements), and design cycle is as shown in Figure 6；Include the following steps：
Step 1 needs frequency-selective surfaces to be applied to be planar structure, therefore uses multicycle combination array.
Step 2, due to be bandpass-type frequency select demand, it may be determined that use slot type array；Due to intermediate zone band
Width is more demanding, low-frequency band bandwidth is larger, and has certain load demand, preferentially uses double-layer sandwich array structure；Into
One step determines coated by dielectric mode such as according to media type and passband central frequency, the structure permission thickness requirements that can select
Shown in Fig. 7, three layers of medium are followed successively by high-density medium (εr=4.0, δ=0.015 tan), low-density medium (εr=1.1, tan δ
=0.002) and high-density medium (εr=4.0, δ=0.015 tan), thickness is respectively 1mm, 30mm and 1mm, two layers of thin period
Array is located at the middle of two layers of high-density medium.
The ratio between step 3, two mid-band frequencies are up to 3.33, it is therefore necessary to be possible to realize using multicycle combination
High center frequency ratio；In view of being operated under relatively narrow ranges of incidence angles, can high frequency band be realized by using branching type unit
Low-frequency band is realized with circular unit to further increase center frequency ratio；The present embodiment selects cross unit and rectangle ring-like
Unit is combined, as shown in Figure 8.
The determination of unit size parameter：It, can be in conjunction with bandwidth requirement according to the approximation relation of resonant frequency and unit size
Determine size L=180mm, W=90mm, the w=2mm of rectangle circular unit, the length l=36mm of cross unit.
According to the requirement of bandwidth, the relative bandwidth of roomy, the high resonance frequency band of opposite band of low resonance frequency band is small, therefore rectangle
The necessary solid matter of circular unit, and cross unit can be appropriate sparse, therefore primarily determine that the period of rectangle circular unit is bigger
In unit size, D is takenu=182mm, Dv=91mm；The period of cross unit takes Du1=Dv1=Dv/2。
Step 4, unit combination and topology adjustment：It is found when being combined to two kinds of cell arrays, is substantially not present interference
Phenomenon, no topological issues.
Step 5 finds that low-frequency resonant frequency band is slightly above design requirement, returns to unit by mould analytic approach simulation calculation
Design parameter is adjusted；
Design result：The size L=178mm, W=88mm, w=2mm, ten of rectangle circular unit are determined after primary modification
The length l=35.6mm of font unit；Array period is adjusted to Du=180mm, Dv=90mm；The period of cross unit takes Du1
=Dv1=Dv/2；It is verified through simulation calculation, frequency response characteristic of the frequency selecting structures in ranges of incidence angles, which meets, to be set
Meter requires, as shown in Figure 9.
Claims (5)
1. it is a kind of with ultra-high frequency than multi-band frequency select construction design method, it is characterised in that：
This approach includes the following steps：
The characteristics of step 1, applying frequency as needed selection surface, select multicycle combination array or different densities group combined array
The cell array combination of row selects the structure on surface to be readily expanded for plane or using plane frequency if necessary to applying frequency
Rate selects structure to carry out Mapping Design and then uses multicycle combination array, otherwise recommends to use different densities combination array；
Step 2, the mechanical property requirements combination frequency response curve according in design requirement, incidence angle, polarization characteristic requirement, determination are more
Medium, coated by dielectric form used by resonance frequency band type frequency selecting structures and the unit form used in each frequency band of realization；It is excellent
First select be easy the high array element form of the tiling such as nested polygon, ring-like space availability ratio and conveniently fill up polygon,
The branching type array element in gap between ring-like array element；
Step 3, for multicycle combination array, according to the resonance frequency band centre frequency in design requirement, bandwidth, intermediate zone width
Each composition unit size parameter and array period are determined with outer/reflectivity requirements；For different densities combination array, according to
Resonance frequency band centre frequency, bandwidth, intermediate zone width in design requirement and determine each component units with outer/reflectivity requirements
Dimensional parameters and a period of time density；
Step 4, for multicycle combination array, component units array is combined, while adjusting topological structure to ensure group
The unit formed after conjunction has topological integrity；For different densities combination array, a period of time is carried out according to design density parameter
Arrangement, each a period of time has topological integrity after ensureing to combine under the premise of meeting density parameter constraint；
The electrical property progress simulation analysis of step 5, multicycle combination array/different densities combination array that design is obtained, such as
Fruit meets design requirement and then exports design result, otherwise returns to step 2.
2. it is according to claim 1 it is a kind of with ultra-high frequency than multi-band frequency select construction design method, it is special
Sign is：The involved array element that affiliated step 2 uses is the polygon for being easy nesting, ring-like or branching type unit.
3. it is according to claim 1 it is a kind of with ultra-high frequency than multi-band frequency select construction design method, it is special
Sign is：The cell array that nested combination is participated in the step 3 has different resonance frequency bands, the difference of centre frequency>5% ×
Centre frequency, and overlapping resonant frequency bands band<50% × smaller bandwidth.
4. it is according to claim 1 it is a kind of with ultra-high frequency than multi-band frequency select construction design method, it is special
Sign is：The basis for estimation that each unit array formed after nested combination in the step 4 has topological integrity is：Bandpass-type
The conductive layer gap of cell array or the cavity of 3 D stereo cell array are not connected to after nesting combines or only in gap or chamber
It is connected at 0 point of body magnetic current, the electric conductor of the conductive layer with resistance type cell array or 3 D stereo unit does not connect after nesting combines
It is logical or be only connected at 0 point of surface current.
5. it is according to claim 1 it is a kind of with ultra-high frequency than multi-band frequency select construction design method, it is special
Sign is：The ratio between the centre frequency of high frequency band and the centre frequency of low-frequency band can be very high, typically larger than>2, no maximum；
Transmissivity (bandpass-type)/reflectivity (band resistance type) in high frequency band may be substantially higher than traditional single cycle combination or with density group
Combined array arranges, situation when performance is close to no graing lobe.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110247194A (en) * | 2019-06-14 | 2019-09-17 | 北京航空航天大学 | The upper transmittance prediction technique and system of the double-deck bandpass-type frequency selecting structures |
| CN111342238A (en) * | 2020-03-09 | 2020-06-26 | 安徽华夏显示技术股份有限公司 | Broadband absorption metamaterial with microwave and terahertz wave bands |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110247194A (en) * | 2019-06-14 | 2019-09-17 | 北京航空航天大学 | The upper transmittance prediction technique and system of the double-deck bandpass-type frequency selecting structures |
| CN111342238A (en) * | 2020-03-09 | 2020-06-26 | 安徽华夏显示技术股份有限公司 | Broadband absorption metamaterial with microwave and terahertz wave bands |
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| CN108682963B (en) | 2021-08-17 |
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