CN107768835B - Asymmetric double frequency range treble clef shape microwave frequency band left-handed material - Google Patents
Asymmetric double frequency range treble clef shape microwave frequency band left-handed material Download PDFInfo
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- CN107768835B CN107768835B CN201711003494.9A CN201711003494A CN107768835B CN 107768835 B CN107768835 B CN 107768835B CN 201711003494 A CN201711003494 A CN 201711003494A CN 107768835 B CN107768835 B CN 107768835B
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- frequency range
- treble clef
- handed material
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- frequency band
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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
Asymmetric double frequency range treble clef shape microwave frequency band left-handed material, is related to electromagnetism Meta Materials.Equipped with medium substrate, it is covered with good conductor layer in the upper surface of medium substrate, the good conductor layer is treble clef shape, and 4 band notch semicircular ring of the good conductor layer by centrally located trunk framework metal band with trunk framework metal with two sides form；4 annular indentations are located at transversal symmetrical center positions；Trunk framework metal is equipped with one section of clubfoot extended to the left with bottom and forms treble clef pattern.Have many advantages, such as that structure is simple, easy to process, can realize DNG feature in wider frequency range.
Description
Technical field
The present invention relates to electromagnetism Meta Materials, more particularly, to a kind of double frequency based on asymmetric treble clef shape cellular construction
Left-handed material.
Background technique
Electromagnetism Meta Materials refer to that some natures do not have the artificial composite material [1] of certain electromagnetic properties.It is often
Monomer material periodic arrangement obtains.The Meta Materials of narrow sense are often referred to left-handed material (LHMs), refer to it is a kind of certain frequency range similarly hereinafter
The electromagnetic material of Shi Shixian negative dielectric constant and negative magnetic conductivity, wherein the wave vector and Poynting vector of the electromagnetic wave propagated
Just on the contrary, therefore left-handed material compared to nature, other common materials possess some peculiar electromagnetic properties, such as: inverse Doppler
Effect, evanescent wave enlarge-effect, inverse Cerenkov radiation effect (Cerenkov), backward wave effect, " perfect lens " effect with
And negative index etc., stealthy cape may be implemented[2]Or super lens etc..
Currently, the left-handed material being widely studied is in the majority in microwave frequency band, the classical left-handed material of microwave frequency band is realized
The Ω type structure that structure has J.T.Huangfu to design[3], the S-shaped resonance structure that proposes of H.S.Chen et al.[4], dendritic structure, point
Type fishing net structure, right-angled intersection circular ring structure, random structure, petal-shaped structure[5]With DNA helical structure[6]Etc..These knots
Structure has many advantages, such as that performance is more stable, structure snd size are easier to calculate, but because substantially symmetrically structure and
Some or double-layer structure, so having the shortcomings that the bandwidth for generating left hand characteristic is narrow, adjustable parameter is few, processing is complicated.
For example, the JiaFu Wang et al. of air force engineering university in 2015[7]The left hand designed using the double-deck split ring resonator
Material is implemented around magnetic conductivity and dielectric constant in 12GHz and is negative, and only designed structure is double-deck, practical application
It is middle to there is the disadvantages of processing is complicated.Abdulrahman Shueai Mohsen Alqadami in 2017 et al.[8]Utilize symmetrical spiral shell
It revolves resonator structure and realizes left hand characteristic, and the left-handed configuration is applied in 5GHz mimo antenna, realize miniaturization and increase
The radiation characteristic of strong antenna.
These structures described above are to realize negative magnetic conductance in special frequency channel using the magnetic resonance and electric resonance of metal structure
Rate and negative permittivity and realize left hand characteristic, but designed structure faces that bandwidth is narrow, conduction loss is bigger
And the main problems such as manufacturing process is more complicated.With the continuation of left-handed material research work, new left-handed configuration unit is continuous
It is devised, left-handed material is made to increase to single side, bandwidth from two-sided and smaller direction is lost and develop.
Bibliography:
[1]Engheta,Nader；Richard W.Ziolkowski.Metamaterials:Physics and
Engineering Explorations[M].John Wiley&Sons.2006:3–30,37,143–150,215–234,240–
256.
[2]Schurig D,Mock J J,Justice B J,et al.Metamaterial electromagnetic
cloak at microwave frequencies.[J].Science,2006,314(5801):977-80.
[3]Huangfu J,Ran L,Chen H,et al.Experimental confirmation of negative
refractive index of a metamaterial composed ofΩ-like metallic patterns[J]
.Applied Physics Letters,2004,84(9):1537-1539.
[4]Chen H,Ran L,Huangfu J,et al.Left-handed materials composed of
only-shaped resonators[J].Physical Review E Statistical Nonlinear&Soft Matter
Physics,2004,70(2).
[5] New Microstrip Antenna research [D] Xiamen University of the Jin Wanqing based on composite right/left-handed transmission line, 2015.
[6] left-handed material unit and its Antenna Design [D] Xiamen University of the Li Jian based on irregular/unsymmetric structure,
2016.
[7]Wang J F,Qu S B,Ma H,et al.Tunable planar left-handed
metamaterials based on split-ring resonator pairs[C].IEEE Mtt-S International
Microwave Workshop Series on Advanced Materials and Processes for Rf and Thz
Applications.IEEE,2015:1-3.
[8]Alqadami A S M,Jamlos M F,Soh P J,et al.Left-handed compact MIMO
antenna array based on wire spiral resonator for 5-GHz wireless applications
[J].Applied Physics A,2017,123(1):64.
Summary of the invention
The purpose of the present invention is to provide a kind of double frequency left-handed material based on asymmetric treble clef shape cellular construction.
The present invention is equipped with medium substrate, is covered with good conductor layer in the upper surface of medium substrate, the good conductor layer is high pitch
Clef shape, 4 band notch half of the good conductor layer by centrally located trunk framework metal band and trunk framework metal with two sides
Annulus composition；4 annular indentations are located at transversal symmetrical center positions；Trunk framework metal extends with bottom equipped with one section to the left
Clubfoot simultaneously forms treble clef pattern.
Rectangle high performance dielectric substrate can be used in the medium substrate, and the thickness of medium substrate can be 2~3mm, and length can
For 10~20mm, width can be 9~20mm, and relative dielectric constant can be 2~9, and loss angle tangent is better than 0.025.
The good conductor layer can be selected from the metal materials such as copper, silver.
4 bands notch semicircular ring can be mal-distribution.
2 sense formula resonance band notch semicircular rings side by side are located at trunk skeleton gold on the right side of the trunk framework metal band
Belong to band top and middle part, the distance at the top of the distance of center circle trunk framework metal band with notch semicircular ring is respectively 1.2~2.4mm, 5.0
~10.0mm, the mutual inductance on the right side of arrangement control unit up and down, respective outer radius can be 1.2~2.4mm, 1.8~3.6mm, semicircle
Ring width is 0.5~1.0mm, and size variation influences its inductance parameter；2 prepared on the left of trunk framework metal band are with one heart
Semicircular ring be located in the middle part of metal tape, distance of center circle distance from top is 4.8~9.6mm, and respective outer radius is 2.2~4.4mm, 1.2
~2.4mm, semicircle ring width are 0.5~1.0mm, and the mechanism of action is to influence its inductance parameter and control left side mutual inductance.Four
Notch in the middle part of semicircular ring is respectively positioned on the transversal symmetrical center positions of circular arc, and width is 0.2~1.0mm, and notch introduces local electricity
Hold.
The length of the trunk framework metal band can be 8~16mm, and width can be 0.6~1.2mm, influence total magnetic
Resonance frequency, and be responsible for generating the negative dielectric constant of entire circuit.The clubfoot length that metal tape bottom extends to the left be 1.6~
3.2mm, width are 0.6~1.2mm, and metal tape terminal end shape uses half round lead angle, exist between sense formula resonance circular arc and couple
Capacitor, it is negligible when low frequency.
Compared with existing left-handed material, asymmetric treble clef shape two-band left-handed material tool provided by the present invention
Have the advantages that structure is simple, easy to process, can realize DNG feature in wider frequency range.Wherein, double negative frequency ranges are jumped
Negative index can reach -6 at height, the scope of design higher than in general literature -1~-4.The shape on loop in electromagnetic wave incident
At inductance, the aperture slots on loop form capacitor, and there are interannular capacitors between ring 2 and ring 4, and there are couplings between clubfoot and big ring
Capacitor is closed, the negative dielectric constant of entire circuit is mainly generated by intermediate trunk framework metal band, so that it is determined that magnetic resonance frequencies.When
For magnetic resonance in negative dielectric constant frequency range, which nearby just produces left hand characteristic.Primarily determine asymmetric treble clef
After the substantially value range of shape left-handed material parameters, software is recycled to carry out simulation optimization to determine final structure.
Detailed description of the invention
Fig. 1 is the left-handed material cellular construction figure of the asymmetric treble clef shape of the present invention.
Fig. 2 is the relative equivalent change in dielectric constant schematic diagram that the present invention is implemented.In Fig. 2, abscissa is frequency/GHz,
Ordinate is the value of relative equivalent dielectric constant；Solid line is the real part of effective dielectric constant, and dotted line is effective dielectric constant
Imaginary part.
Fig. 3 is that the relative equivalent magnetic conductivity that the present invention is implemented changes schematic diagram.In Fig. 3, abscissa is frequency/GHz, is indulged
Coordinate is the value of relative equivalent magnetic conductivity；Solid line is the real part of equivalent permeability, and dotted line is the imaginary part of equivalent permeability.
Fig. 4 is the variations in refractive index schematic diagram that the present invention is implemented.In Fig. 4, abscissa be frequency/GHz, ordinate be etc.
Imitate the value of refractive index；Solid line is the real part of equivalent refractive index, and dotted line is the imaginary part of equivalent refractive index.
Specific embodiment
Overall structure figure such as Fig. 1 institute of asymmetric treble clef shape two-band left-handed material provided in an embodiment of the present invention
Show, the asymmetric treble clef shape two-band left-handed material is equipped with high performance dielectric substrate, and the upper surface of medium substrate is covered with
Layers of copper.Thickness h=2.6mm on FR4 medium substrate, shape are rectangle, side length A=13mm and B=13mm, relative dielectric constant
εr=4.4.Layers of copper etching is asymmetric treble clef shape, the trunk framework metal strip length A of structure centre0=12mm, width
t1=1mm, the clubfoot length l that metal tape bottom extends to the left1=2.5mm, width t3=1mm, metal tape terminal end shape is using half
Round lead angle.Trunk framework metal band two sides prepare 4 asymmetrically distributed band notch sense formula resonance semicircle ring structures, trunk skeleton
2 semicircular rings prepared side by side are located at the top of metal tape on the right side of metal tape and middle part, distance of center circle distance from top are respectively d1=
1.7mm and d3=7.2mm, respective outer radius are r1=1.7mm and r3=2.8mm, semicircle ring width t2=0.6mm, semicircular ring 1
The notch at middle part is located at transversal symmetrical center positions, and the notch of width g=0.6mm, 3 middle part of semicircular ring are located at transversal symmetrical centre
Position, width g=0.6mm；2 concentric semicircular rings are located in the middle part of metal tape on the left of trunk framework metal band, at the top of distance of center circle
Distance d2=6.8mm, respective outer radius are r2=3.3mm and r4=2.1mm, semicircle ring width t2=0.6mm, 2 middle part of semi arch
Notch be located at transversal symmetrical center positions, the notch of width g=0.6mm, 4 middle part of semi arch are respectively positioned on transversal symmetrical centre position
It sets, width g=0.6mm.
Referring to fig. 2 with 3, the design is in 8.2~8.7GHz frequency range and 9.4 to producing negative Jie in 9.9GHz band limits
Electric constant；The design produces negative magnetoconductivity in 8.2~8.7GHz frequency range and 9.4~11GHz band limits；So knowing
The frequency range for generating DNG feature is the two intersection, i.e. 8.2~8.7GHz frequency range and 9.4~9.9GHz, and designed is asymmetric
Treble clef shape two-band left-handed material has left hand characteristic in this frequency range.
Referring to fig. 4, start to generate negative refractive index n at double negative trip points, nearby negative index is up to -6 to the point, is higher than
The left-handed material of refractive index between designed -1~-4 in general literature.
It can be concluded that, realize the frequency range of left hand characteristic with respect to its left-handed configuration by non-uniformity structure from analysis above
Resonance frequency point deviated, and symmetrically structure realize left hand characteristic frequency range and the resonance frequency point phase of its left-handed configuration
It is corresponding.
Claims (10)
1. asymmetric double frequency range treble clef shape microwave frequency band left-handed material, it is characterised in that medium substrate is equipped with, in medium base
The upper surface of plate is covered with good conductor layer, and the good conductor layer main body is based on a class treble clef shape, by centrally located one
Four semicircular rings of trunk framework metal band of the root bottom part with right angle clubfoot and its two sides are constituted, wherein by two below left side
The semicircular ring of different radii is symmetrically nested with circle center, and it is different with lower right side to be respectively equipped with two radiuses in right hand top
Semicircular ring, wherein the radius of right hand top semicircular ring is less than the radius of lower right side semicircular ring, lower right side semicircular ring both ends point
It is not connected with two semicircular rings in left side, the middle part in four semicircular rings has notch, and 4 annular indentations are located at transversal
Symmetrical center positions.
2. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that given an account of
Matter substrate uses Rectangular Enclosure with Participating Media substrate, medium substrate with a thickness of 2~3mm, length is 10~20mm, and width is 9~20mm, phase
It is 2~9 to dielectric constant, loss angle tangent is better than 0.025.
3. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that described good
Conductor layer is selected from copper, silver metal material.
4. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that described 4
Band notch semicircular ring is mal-distribution.
5. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that the master
2 sense formula resonance band notch semicircular rings side by side are located at the top of trunk framework metal band on the right side of dry framework metal band
Portion, the distance at the top of the distance of center circle trunk framework metal band with notch semicircular ring are respectively 1.2~2.4mm, 5.0~10.0mm, on
Mutual inductance on the right side of lower arrangement control unit, respective outer radius are 1.2~2.4mm, 1.8~3.6mm, and semicircle ring width is 0.5
~1.0mm.
6. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that the master
The 2 concentric semicircular rings prepared on the left of dry framework metal band are located in the middle part of metal tape, distance of center circle distance from top for 4.8~
9.6mm, respective outer radius are 2.2~4.4mm, 1.2~2.4mm, and semicircle ring width is 0.5~1.0mm.
7. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that described 4
Notch in the middle part of semicircular ring is respectively positioned on the transversal symmetrical center positions of circular arc, and width is 0.2~1.0mm.
8. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that the master
The length of dry framework metal band is 8~16mm, and width is 0.6~1.2mm.
9. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that metal tape
The clubfoot length that bottom extends to the left is 1.6~3.2mm, and width is 0.6~1.2mm.
10. asymmetric double frequency range treble clef shape microwave frequency band left-handed material as described in claim 1, it is characterised in that the gold
Belong to end of tape shape and uses half round lead angle.
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