CN207183542U - High selectivity frequency-selective surfaces - Google Patents
High selectivity frequency-selective surfaces Download PDFInfo
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- CN207183542U CN207183542U CN201721130925.3U CN201721130925U CN207183542U CN 207183542 U CN207183542 U CN 207183542U CN 201721130925 U CN201721130925 U CN 201721130925U CN 207183542 U CN207183542 U CN 207183542U
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Abstract
The utility model discloses a kind of high selectivity frequency-selective surfaces, belong to the technical field of electromagnetic field and microwave.The metal level of the frequency-selective surfaces includes multiple metal units of periodic arrangement, antenna house, metal mirror etc. can be used as to be used for military and civilian field；The frequency-selective surfaces include upper and lower two layers mutually isostructural frequency-selective surfaces metal level and middle dielectric layer；The frequency-selective surfaces metal unit includes metal Fang Huan and four metal isosceles right triangles, and four angles of metal wire connection side ring with four bendings and triangle base.The utility model realizes frequency band-pass filtering property, respectively introduces a transmission zero in passband both sides using double layer of metal structure, reduces the intermediate zone between passband and stopband, realize the steep drop of band logical both sides, realize the high selectivity of frequency-selective surfaces.
Description
Technical field
The utility model belongs to the technical field of electromagnetic field and microwave, more particularly to a kind of high selectivity frequency selection table
Face.
Background technology
Frequency-selective surfaces (Frequency selective surface, FSS) are according to periodically by identical unit
The single or multiple lift planar structure being arranged to make up, itself can not absorb energy, but have the function that filtering, substantially be a kind of
Spatial filter.Characteristic possessed by frequency-selective surfaces is widely used in antenna system, radome, wireless security screen
The field such as cover.
In recent years, frequency multiplexing technique is all received in commercial communication and military field and greatly paid attention to, and is quickly grown.But
The subsystem of multiple different frequencies is integrated in same system, and the coupling and interference between each subsystem may influence entirely
The performances of system, frequency-selective surfaces are applied in these systems and effectively can be come out the signal isolation of different frequency,
Influence between them is preferably minimized.The application of different frequency also result in the growing tension of frequency spectrum resource, therefore high-performance
Frequency-selective surfaces increasingly become a kind of focus, wherein the bilateral characteristic that drops suddenly is particularly critical.Pair of frequency-selective surfaces
The intermediate zone that can greatly reduce between passband and stopband drops in side suddenly, is allowed to close to preferable filtering performance.Realize frequency
The bilateral steep drop of rate selection surface transmission response, can utilize Multilayer Frequency-Selective Surfaces cascade structure, but this can cause entirety
Frequency-selective surfaces thickness it is very big, often do not agree with practical application；A transmission zero is respectively introduced in passband both sides also may be used
To realize the bilateral steep drop of frequency-selective surfaces transmission response.
For example, document《Design and experimental verification of compact frequency-
selective surface with quasi-elliptic bandpass response》(G.Q.Luo,W.Hong,
Q.H.Lai,K.Wu,and L.L.Sun,“IEEE Trans.Microw.Theory Techn.,vol.55,no.12,
Pp.2481-2487, Dec.2007 ") propose a kind of frequency-selective surfaces based on integrated waveguide, respectively introduced in passband both sides
One transmission zero, passband is realized to the steep drop between stopband.
It can be found that to realize that the bilateral frequency-selective surfaces dropped suddenly can utilize multilayer frequency to select from various documents
The technology such as surface superposition or integrated waveguide, but these technologies are often sufficiently complex so that frequency-selective surfaces processing and fabricating
It is very difficult, it is difficult in actual applications.
Utility model content
The purpose to be realized of the utility model：In order to overcome in present technology, high selectivity frequency selection table is realized
Face, it is necessary to complex technology and the problem of be difficult to realize in actual applications, put forward a kind of new Gao Xuan being easily achieved
Select resistant frequency selection surface.
To achieve these goals, concrete scheme is as follows：
The utility model high selectivity frequency-selective surfaces are made up of the unit of multiple periodic distributions, and each unit is from upper
Include the first metal layer, dielectric layer, second metal layer successively under；The first metal layer is identical with second metal layer structure size,
And it is symmetrical arranged relative to dielectric layer.
The first metal layer, second metal layer are mainly by square ring, and four metal structures being placed in Fang Huan are formed；Metal
Structure includes folding line, triangular structure, and four metal structures are centrosymmetric distribution；
One end of folding line and Fang Huan interior angle connect, and the length of side center of the other end and triangular structure connects.
Further, the Fang Huan of the frequency-selective surfaces unit, folding line, triangular structure are metal.
Further, material is F4B-2 used by the dielectric layer of the frequency-selective surfaces.
Further, when the frequency-selective surfaces working frequency is near 4.8-5.1GHz, thickness of dielectric layers 2mm.
Further, the unit size of the frequency-selective surfaces is 8.8mm × 8.8mm；
Further, metal side's ring size is 8.8mm × 8.8mm, hem width 0.8mm；
Further, a length of 9.3mm of metal folding line, a width of 0.2mm of metal folding line；
Further, triangles of metal is right angled isosceles triangle, a length of 2.4mm of its waist, and the spacing of adjacent triangle is
0.4mm.One end of folding line and Fang Huan interior angle connect, and the base center of the other end and right angled isosceles triangle connects.
Compared with prior art, the beneficial effects of the utility model：
1. frequency-selective surfaces of the present utility model only need one layer of medium and double layer of metal, it is only necessary to which individual layer pcb board adds
Work, realization easy to process.
2. the utility model realizes frequency band-pass filtering property, one is respectively introduced in passband both sides using double layer of metal structure
Transmission zero, reduce the intermediate zone between passband and stopband, realize the bilateral steep drop of band logical both sides, reduce passband and stopband
Between intermediate zone realize the high selectivities of frequency-selective surfaces.
3. transmission response band internal loss is less than 1dB in frequency-selective surfaces of the present utility model, have good flat-top special
Property.
4. frequency-selective surfaces of the present utility model still have good transmission in the case of not same polarization and 45 ° of oblique incidences
Response.
5. the unit size of frequency-selective surfaces of the present utility model is 1/7th wavelength, there is the characteristic of miniaturization.
Brief description of the drawings
Fig. 1 is frequency-selective surfaces metal unit schematic diagram described in the utility model；
Fig. 2 is frequency-selective surfaces structural representation described in the utility model, wherein (2) are the first metal layer, (3) are Jie
Matter layer, (4) are second metal layer；
Fig. 3 is frequency-selective surfaces artificial reflections coefficient described in the utility model and transmission coefficient curve map；
Fig. 4 is transmission curve figure of the frequency-selective surfaces described in the utility model under 45 ° of oblique incidences of electromagnetic wave：Wherein,
Fig. 4 A are the transmission curve of TE ripples；Fig. 4 B are the transmission curve of TM ripples.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, frequency-selective surfaces metal unit structure of the present utility model includes metal Fang Huan (11) and four
Metal isosceles right triangle (13), and with four bending four angles of metal wire (12) connection side's ring and triangle base；
If Fig. 2 is frequency-selective surfaces structural representation described in the utility model, including frequency-selective surfaces the first metal layer (2), it is situated between
Scutum (3), wherein frequency-selective surfaces second metal layer (4), frequency-selective surfaces the first metal layer (2) and frequency-selective surfaces
Second metal layer (4) is identical, and symmetrical on dielectric-slab (3).
The first metal layer (2) and second metal layer (4) of high selectivity frequency-selective surfaces of the present utility model are copper foil,
Dielectric layer (3) thickness is 2mm, dielectric material F4B-2, dielectric constant 2.65, metal unit (1) size be 8.8mm ×
8.8mm, metal Fang Huan (11) hem width are 0.8mm, and four right-angle sides are placed among Fang Huan at a distance of 0.4mm isosceles right angle three
Angular (13), the metal folding line (12) for being 9.3mm with length connect the corner of triangle (13) and square ring (11).
During electromagnetic wave vertical incidence, inductance is equivalent to when direction of an electric field is parallel to metal wire, direction of an electric field is perpendicular to metal
During line, the gap between adjacent wires can be equivalent to electric capacity.In frequency-selective surfaces metal unit of the present utility model, gold
Category folding line (12) is equivalent to inductance, and the gap between adjacent metal triangle (13) is equivalent to electric capacity, series capacitance inductance structure
Transmission zero is produced into series resonance；And gap and metal between metal folding line (12), adjacent metal triangle (13)
Fang Huan (11) forms parallel resonance and produces transmission pole.Therefore single-layer metal unit can produce a transmission zero and a transmission
Limit (fLimit＜ fZero point), double layer of metal unit can produce two transmission zero (f0. 1And f0. 2) and two transmission pole (fLimit 1With
fLimit 2), when dielectric thickness is very big, do not coupled between upper/lower layer metallic, caused transmission zero and limit are fLimit 1＜ fLimit 2
＜ f0. 1＜ f0. 2；When dielectric thickness is gradually reduced, upper/lower layer metallic produces coupling, and transmission pole position is almost unchanged, and one
Individual transmission zero moves to high frequency direction, and a transmission zero can be moved to the left side of transmission pole, f to low frequency direction0. 1＜
fLimit 1＜ fLimit 2＜ f0. 2, obtain a band-pass transmissions response for respectively having a transmission zero in passband both sides.
Being emulated, Fig. 3 is frequency-selective surfaces artificial reflections coefficient described in the utility model and transmission coefficient curve map,
Abscissa is frequency, and ordinate is S parameter.It can be seen that the centre frequency of frequency-selective surfaces passband is 4.85GHz, 3dB bands
Width is about 0.26GHz (4.78GHz-5.04GHz), and relative bandwidth is 5.36%.Maximum insertion is less than 1dB in passband.This
Outside, two transmission zeros can be clearly observed in figure respectively in 4.7GHz and 6.1GHz, the introducing of transmission zero can be with
Steep drop greatly outside enhancing passband, the selectivity of frequency-selective surfaces can be realized well.And the utility model frequency
The unit size for selecting surface is 1/7th resonance wavelengths, has the characteristic of miniaturization, convenient application in practice.
As shown in figure 4, transmission of the utility model high selectivity frequency-selective surfaces in the case of 45 ° of oblique incidences of electromagnetic wave
Curve map, wherein, Fig. 4 A are the transmission coefficient of TE ripples；Fig. 4 B are the transmission coefficient of TM ripples.Under TE ripple incidences, band logical slightly subtracts
Small, the insertion loss in passband has somewhat increased, and centre frequency is almost unchanged；Under TM ripple incidences, passband band logical becomes big, in
Frequency of heart does not also shift.Therefore, the utility model frequency-selective surfaces have good angle stability and polarization steady
It is qualitative.
It is described above, only specific embodiment of the present utility model, in addition with other embodiment, do not departing from this
In the case of utility model principle, to modification of the present utility model and retouching, these modifications and retouching all should be new in this practicality
In the scope of the claims of type.
Claims (9)
1. high selectivity frequency-selective surfaces, it is made up of the unit of multiple periodic distributions, it is characterised in that each unit is from upper
Include the first metal layer, dielectric layer, second metal layer successively under；The first metal layer is identical with second metal layer structure size,
And it is symmetrical arranged relative to dielectric layer；
The first metal layer, second metal layer are mainly by square ring, and four metal structures being placed in Fang Huan are formed；Metal structure
Including folding line, triangular structure, and four metal structures are centrosymmetric distribution.
2. high selectivity frequency-selective surfaces as claimed in claim 1, it is characterised in that the material that the dielectric layer uses for
F4B-2。
3. high selectivity frequency-selective surfaces as claimed in claim 1, it is characterised in that the frequency-selective surfaces working frequency
When near 4.8-5.1GHz, thickness of dielectric layers 2mm.
4. high selectivity frequency-selective surfaces as claimed in claim 1, it is characterised in that the unit size be 8.8mm ×
8.8mm。
5. high selectivity frequency-selective surfaces as claimed in claim 1, it is characterised in that gold side's ring hem width is 0.8mm.
6. high selectivity frequency-selective surfaces as claimed in claim 1, it is characterised in that a length of 9.3mm of metal folding line, line
A width of 0.2mm.
7. high selectivity frequency-selective surfaces as claimed in claim 1, it is characterised in that triangles of metal is right angle isosceles three
It is angular, a length of 2.4mm of its waist.
8. high selectivity frequency-selective surfaces as claimed in claim 1, it is characterised in that the spacing of adjacent triangle is
0.4mm。
9. high selectivity frequency-selective surfaces structure as claimed in claim 1, it is characterised in that unit size is 1/7th
Wavelength.
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| CN201721130925.3U CN207183542U (en) | 2017-09-05 | 2017-09-05 | High selectivity frequency-selective surfaces |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638469A (en) * | 2018-12-14 | 2019-04-16 | 北京无线电测量研究所 | A kind of reflector element and reflectarray antenna of internal load phase minor matters |
| CN110783712A (en) * | 2019-10-27 | 2020-02-11 | 山西大学 | Ultra-wideband strong electromagnetic field protection device |
| CN112216970A (en) * | 2020-09-25 | 2021-01-12 | 杭州泛利科技有限公司 | Miniaturized high-gain flexible unmanned aerial vehicle antenna |
| CN112350066A (en) * | 2020-10-28 | 2021-02-09 | 北京环境特性研究所 | Filtering structure and radome |
| CN114284709A (en) * | 2021-12-20 | 2022-04-05 | 华南理工大学 | Radiation unit, antenna and base station |
-
2017
- 2017-09-05 CN CN201721130925.3U patent/CN207183542U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638469A (en) * | 2018-12-14 | 2019-04-16 | 北京无线电测量研究所 | A kind of reflector element and reflectarray antenna of internal load phase minor matters |
| CN109638469B (en) * | 2018-12-14 | 2020-10-30 | 北京无线电测量研究所 | Reflection unit internally loaded with phase branches and reflection array antenna |
| CN110783712A (en) * | 2019-10-27 | 2020-02-11 | 山西大学 | Ultra-wideband strong electromagnetic field protection device |
| CN110783712B (en) * | 2019-10-27 | 2020-11-06 | 山西大学 | Ultra-wideband strong electromagnetic field protection device |
| CN112216970A (en) * | 2020-09-25 | 2021-01-12 | 杭州泛利科技有限公司 | Miniaturized high-gain flexible unmanned aerial vehicle antenna |
| CN112216970B (en) * | 2020-09-25 | 2023-02-24 | 杭州泛利科技有限公司 | Miniaturized high-gain flexible unmanned aerial vehicle antenna |
| CN112350066A (en) * | 2020-10-28 | 2021-02-09 | 北京环境特性研究所 | Filtering structure and radome |
| CN112350066B (en) * | 2020-10-28 | 2023-05-16 | 北京环境特性研究所 | Filtering structure and radar antenna housing |
| CN114284709A (en) * | 2021-12-20 | 2022-04-05 | 华南理工大学 | Radiation unit, antenna and base station |
| CN114284709B (en) * | 2021-12-20 | 2023-08-18 | 华南理工大学 | Radiating element, antenna and base station |
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