CN103746190A - Dual-frequency band back cross-coupling periodic array left-handed material and preparation method thereof - Google Patents
Dual-frequency band back cross-coupling periodic array left-handed material and preparation method thereof Download PDFInfo
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- CN103746190A CN103746190A CN201410045559.6A CN201410045559A CN103746190A CN 103746190 A CN103746190 A CN 103746190A CN 201410045559 A CN201410045559 A CN 201410045559A CN 103746190 A CN103746190 A CN 103746190A
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Abstract
The invention discloses a dual-frequency band back cross-coupling periodic array left-handed material and a preparation method thereof, and relates to a left-handed material. The left-handed material is provided with at least three rows of microwave dielectric material substrates, wherein at least three three-fork structural metal wire units are carved on one side of each microwave dielectric material substrate, and each three-fork structural metal wire unit consists of metal wire materials which is shaped like the letter E; at least three back three-fork structural metal wire units which are symmetrical to the three-fork structural metal wire units are carved on the other side of each microwave dielectric material substrate, the symmetrical back three-fork structural metal wire units and the three-fork structural metal wire units are the same in number; the centers of the three-fork structural metal wire units and the centers of the back three-fork structural metal wire units are on the same level height; the distances between every two three-fork structural metal wire units are the same; the distances between every two back three-fork structural metal wire units are the same. A negative reflection index, a negative dielectric constant and negative magnetic conductivity can be generated on two different frequency bands close to 12 GHz and 17 GHz at the same time.
Description
Technical field
The present invention relates to a kind of left-handed materials, especially relate to a kind of two-band cross-couplings periodic array left-handed materials and preparation method thereof dorsad.
Background technology
Left-handed materials (left-handed metamaterials) is a kind of artificial composite material also not finding at occurring in nature till now, by the physicist Mandelshtam of the former Soviet Union initial proposition in 1940, it is the difform metallic pattern that etches certain size on traditional circuit medium substrate, at X, at least three graphic element composition periodic structures in Y and Z direction, by these different metal pattern configuration, cause the resonance of Electric and magnetic fields within the scope of certain frequency, when electromagnetic wave passes the medium of this material formation, will show and the diverse character of traditional sucrose.Its principal character be exactly two macroscopical electromagnetic constants of medium be dielectric constant and magnetic permeability simultaneously for negative, but still observe Maxwell equation group, and the dielectric constant of traditional sucrose and magnetic permeability are all positive.Because the electromagnetic feature at Propagation is determined jointly by dielectric constant and magnetic permeability, so different from conventional media, the electromagnetic phase velocity of propagating in material leftward and group velocity opposite direction, electromagnetic direction of propagation of energy and phase velocity opposite direction
with
between meet left hand helix relation rather than right-handed helix relation, left-handed materials hence obtains one's name.Nineteen sixty-eight, the scientist Veselago of the former Soviet Union was studied in theory to left-handed materials at first, knew that left-handed materials can present the characteristic of many novelties, as unusual Doppler effect, unusual Cherenkov effect, negative refraction etc.But over ensuing more than 30 years, because be that the material with above characteristic is not all found in engineering and laboratory, so the research of left-handed materials is stayed cool always.Until the imperial academician J.B.Pendry of the academy of sciences of Britain in 1996 is subject to the inspiration of plasma, evenly distributed wire (Rods), electromagnetic wave is injected wire array, when wavelength and E field polarization direction meet certain condition, this metal array just can be equivalent to plasma, obtains negative dielectric constant; After 3 years, he utilizes again the metal resonant ring (SRR, Split ring resonator) of opening, has obtained negative magnetic permeability under the condition of specific incident wave.2000, the scientist D.R.Smith research group of the U.S. is on the basis of people's researchs such as Pendry, SRR and Rods are reasonably combined, obtained first thering is negative dielectric constant and the material of magnetic permeability simultaneously, hereafter, increasing people joins in the research boom of left-handed materials, and left-handed materials is chosen as one of 2003 year ten large technological breakthroughs by " Science " magazine.Under study for action, find that gradually there is important using value in the fields such as left-handed materials is stealthy at optics, electromagnetism, acoustics, electromagnetism, communication, diagnosis imaging.At present, researcher designed left-handed materials in various countries' can realize left hand characteristic in certain frequency or frequency range, and various cellular constructions have been designed, comprising spiral ring type structure (Pendry J B.A chiral route to negative refraction[J] .Science, 2004, 306 (5700): 1353-1355), dendritic structure (Zhang B S L C R, Xiao-Peng Y P Z.Broadband metamaterial absorber based on dendritic structure[J] .ActaPhysicaSinica, 2010, 5:042), mushroom-shaped structure, two S type structures, Z-type structure etc.
Summary of the invention
The object of this invention is to provide a kind of two-band cross-couplings periodic array left-handed materials and preparation method thereof dorsad.
Described two-band dorsad cross-couplings periodic array left-handed materials is provided with at least 3 row's microwave dielectric material substrates, one at least 3 trifid structure metal wire unit of side engraving of described microwave dielectric material substrate, described trifid structure metal wire unit is comprised of as the wire-like material of letter e shape; At least 3 of the opposite side engravings of microwave dielectric material substrate and the metal wire of the trifid structure dorsad unit of trifid structure metal wire unit symmetry, the metal wire of the trifid structure dorsad unit of described symmetry is identical with the number of trifid structure metal wire unit, the center of the center of trifid structure metal wire unit and dorsad trifid structure metal wire unit is at same level height, distance between trifid structure metal wire unit is identical, and the distance between trifid structure metal wire unit is identical dorsad.
The dielectric constant of described microwave dielectric material substrate can be 2.2～16, and representative value is 4.4 ± 5%; Thickness can be 0.2～3mm, and representative value is 0.4 ± 5%mm.
Described trifid structure metal wire and dorsad the outside length of side a of trifid structure metal wire unit can be 2.0～3.0mm, the length b of outer bottom edge can be 1.0～2.5mm, center bar length of side c can be 0.8～2.0mm, the width w on the each limit of metal wire can be 0.05～0.25mm, and metal thickness can be 0.01～0.03mm; Its representative value is a=3.0 ± 0.02mm, w=0.2 ± 0.02mm, b=2.2 ± 0.02mm, c=1.6 ± 0.02mm, metal thickness=0.018mm ± 5%.
After optimum organization, can obtain the different electromagnetic parameters of left-handed materials (effective dielectric constant ε and equivalent permeability μ), within the scope of 8～20GHz on certain two different frequent points effective dielectric constant and equivalent permeability simultaneously for negative.
Described two-band is the preparation method of cross-couplings periodic array left-handed materials dorsad, comprises the following steps:
(1) adopt circuit board lithographic technique, carve forward and trifid structure metal wire cell array dorsad respectively in the dielectric material microwave base plate both side surface of the two-sided deposited good conductor of designed gauge, construction unit center distance can be chosen 3～10mm according to design frequency range, and representative value is 6.5 ± 0.5mm;
(2) geometry parameter changing in basic cell structure makes various different big or small construction units;
(3) the prepared cross-coupling unit array dielectric-slab that is distributed with periodically is dorsad cut into multiple unit and becomes the list structure of row, then place side by side and form two-dimentional two-band cross-couplings periodic array left-handed materials dorsad.
Structure of the present invention is comprised of the monosymmetric cross-couplings metal wire of substrate.One side of high-performance dielectric material microwave base plate is carved the trifid structure metal wire of one group at least three opening homonymies; The opposite side of microwave base plate is carved the metal wire of trifid structure dorsad that same number of opening is contrary, and the metal wire structure of substrate both sides on same level height and space periodic size identical.Have the microwave board of above structure along axially-aligned at least three row, form the periodic structure on both direction, such periodic array structural entity can be regarded a kind of novel microwave left-hand material as.The two-band preparing so dorsad cross-couplings periodic array left-handed materials can produce negative index, negative permittivity and negative magnetoconductivity in two different frequency ranges simultaneously.The regulatable geometry parameter of this material has the length on each limit in each trifid structure metal wire, the live width on each limit, the position of center bar, and these parameters are all also the key factors that can affect left-handed materials equivalent electric magnetic parameter simultaneously.Therefore as long as each geometry parameter in cross-coupling unit structure is dorsad regulated, just can obtain the Novel left-hand material with different equivalent electromagnetic parameter according to the needs in different practical applications, comprising effective dielectric constant, equivalent permeability and equivalent refractive index.Two-band of the present invention dorsad cross-couplings periodic array material is a kind of novel left-handed materials, has the advantages that on two different frequency ranges, to realize left-handedness effect.
The left-handed materials of different structure has the characteristic of oneself, a kind of two-band provided by the invention dorsad cross-couplings periodic array left-handed materials can realize left hand characteristic in two wider frequency ranges, and this is because the induced current that the metal wire of cross coupling structure produces under the effect of incident electromagnetic wave dorsad can produce electromagnetic resonance in two different frequencies; And by the structural parameters that change resonant ring, just can change resonance frequency and the resonance intensity of electric current, thereby further change the left hand characteristic of material.Because the special cellular construction of cross-couplings periodic array has dorsad formed two different resonant tanks, the resonance on loop of the induced current on metal wire, realizes left-handedness effect thereby can realize within the scope of two different frequencies; Thereby and can be by size and the intensity of the live width of change structure and the position of center bar change resonance loop and resonance frequency.
Compared with common left-handed materials structure, construction unit special design of the present invention cross-couplings periodic array left-handed materials dorsad; The left-handed materials of this structure can realize and near two different frequency ranges 12GHz and 17GHz, produce negative index, negative permittivity and negative magnetoconductivity (being left-handedness effect) simultaneously; By adjusting resonance frequency and the resonance intensity that the parameter such as live width, center bar position of metal wire can tuning control structure unit, thereby change the frequency range that produces left-handedness effect to reach the needs of practical application.
Accompanying drawing explanation
Fig. 1 is the two-band of the present invention structure composition schematic diagram of cross-couplings periodic array left-handed materials embodiment dorsad.
Fig. 2 is the two-band of the present invention structure composition schematic diagram of the front metal line unit of cross-couplings periodic array left-handed materials embodiment dorsad.
Fig. 3 is the two-band of the present invention structure composition schematic diagram of the back metal line unit of cross-couplings periodic array left-handed materials embodiment dorsad.
Fig. 4 is waveguide port transmission coefficient and reflection coefficient changes in amplitude schematic diagram in the embodiment of the present invention.In Fig. 4, abscissa is frequency/GHz, and ordinate is the amplitude of S parameter; Curve a is the changes in amplitude schematic diagram of parameter S 11, and curve b is the changes in amplitude schematic diagram of parameter S 12.
Fig. 5 is waveguide port transmission coefficient and reflection coefficient phase variation schematic diagram in the embodiment of the present invention.In Fig. 5, abscissa is frequency/GHz, and ordinate is the phase place/rad of the radian of S parameter; Curve a is that the phase place of parameter S 11 changes schematic diagram, and curve b is that the phase place of parameter S 12 changes schematic diagram.
Fig. 6 is that in the embodiment of the present invention 1, left-handed materials array effective dielectric constant changes schematic diagram.In Fig. 6, abscissa is frequency/GHz, the value that ordinate is dielectric constant; Curve a is the real part of complex dielectric permittivity, the imaginary part that curve b is complex dielectric permittivity.
Fig. 7 is that in the embodiment of the present invention 1, left-handed materials array equivalent permeability changes schematic diagram.In Fig. 7, abscissa is frequency/GHz, the value that ordinate is magnetic permeability; Curve a is the real part of complex dielectric permittivity, the imaginary part that curve b is complex dielectric permittivity.
Embodiment
The present invention is further illustrated in connection with accompanying drawing for following examples.
Referring to Fig. 1～3, two-band of the present invention dorsad cross-couplings periodic array left-handed materials embodiment is provided with at least 3 row's microwave dielectric material substrates 1, one side 11 of described microwave dielectric material substrate 1 is carved at least 3 trifid structure metal wire unit, and described trifid structure metal wire unit is comprised of as the wire-like material 12 of letter e shape; The opposite side 21 of microwave dielectric material substrate 1 carve at least 3 with the metal wire of the trifid structure dorsad unit 22 of trifid structure metal wire unit 12 symmetries, the metal wire of the trifid structure dorsad unit 22 of described symmetry is identical with the number of trifid structure metal wire unit 12,12 center, trifid structure metal wire unit and dorsad 22 center, trifid structure metal wire unit are at same level height, distance between trifid structure metal wire unit 11 is identical, and the distance between trifid structure metal wire unit 22 is identical dorsad.
The dielectric constant of described dielectric material microwave base plate can be 2.2～16, is preferably 4.4 ± 5%; Thickness can be 0.2～3mm, is preferably 0.4 ± 5%mm.
In described symmetrical three prong like, three forked outside length of side a=2.0～3.0mm, width w=0.05～the 0.25mm on each limit, length b=1.0～the 2.5mm of outer bottom edge, its representative value of center bar length of side c=0.8～2.0mm. is a=3.0 ± 0.02mm, w=0.2 ± 0.02mm, b=2.2 ± 0.02mm, c=1.6 ± 0.02mm.
After optimum organization, can obtain the different electromagnetic parameters of left-handed materials (effective dielectric constant ε and equivalent permeability μ), near 12GHz and 17GHz, in frequency range, can realize respectively effective dielectric constant and equivalent permeability simultaneously for negative.
Adopt circuit board engraving technology, thickness is that the ptfe substrate of 0.4mm ± 5% or certain one side of epoxy glass substrate etch at least three identical shapes as the metal wire cellular construction formation periodic array of letter e, the metal wire structure that cycle repeats must be distributed on a parallel axis of three horizontal sides, center distance is 3.0 ± 0.01, the thickness of metallic copper is 0.018mm ± 5%, length of side a=3.0 ± 0.01mm outside trifid structure metal wire structure, width w=0.20 ± the 0.01mm on each limit, length b=2.2 ± the 0.01mm of metal wire structure outer bottom edge, center bar length of side c=1.6 ± 0.4mm, on microwave-medium substrate opposite side same level height, etch symmetrical metal wire structure dorsad, repetition period two sides is identical.By the same at least three row's formations periodic array as shown in Figure 1 of arranging on microwave base plate axis direction of cycle array structure in a direction of making, (in Fig. 1, the axial-periodic distance between adjacent substrate is 1.25mm).According to the periodic array structure being made like this, the geometry parameters such as the length width to each limit in metal wire structure dorsad in cellular construction carry out complex optimum combination, get different values, just can make the two-band cross-couplings periodic array left-handed materials dorsad that can work in special frequency channel, and there is different effective dielectric constants, equivalent permeability and equivalent refractive index.
The performance of implementation procedure of the present invention, test process and material is illustrated by following examples and accompanying drawing.
Adopt circuit board lithographic technique, thickness be 0.4mm ± 5% cover copper thickness be a side of the ptfe substrate of 0.018mm ± 5% etch 7 identical metallic coppers dorsad cross-coupling unit structure form periodic array, the trifid structure metal wire periodically repeating must be distributed on a parallel axis of three horizontal sides of metal wire structure, its center distance is 3.0 ± 0.01mm, outside length of side a=3.0 ± 0.01mm, width w=0.20 ± the 0.01mm on each limit, the outer bottom edge length b=2.2 ± 0.01mm of trifid structure metal wire, center bar length c=1.6 ± 0.01mm, on the position at the corresponding metal wire structure of medium substrate opposite side center, etch symmetrically same periodicity metal wire structure array dorsad.Become the periodicity left-handed materials of 7 cellular constructions equidistantly arranged side by side three to drain into waveguide cavity inside the microwave incident direction being prepared into like this, record the waveguide port transmission coefficient S12 that left-handed materials is housed inside and reflection coefficient S11 changes in amplitude situation as shown in Figure 4, waveguide port transmission coefficient S12 and reflection coefficient S11 phase place situation of change are as shown in Figure 5, and the effective dielectric constant being gone out by S calculation of parameter as shown in Figure 6, equivalent permeability as shown in Figure 7.
Claims (7)
1. two-band cross-couplings periodic array left-handed materials dorsad, it is characterized in that being provided with at least 3 row's microwave dielectric material substrates, one at least 3 trifid structure metal wire unit of side engraving of described microwave dielectric material substrate, described trifid structure metal wire unit is comprised of as the wire-like material of letter e shape; At least 3 of the opposite side engravings of microwave dielectric material substrate and the metal wire of the trifid structure dorsad unit of trifid structure metal wire unit symmetry, the metal wire of the trifid structure dorsad unit of described symmetry is identical with the number of trifid structure metal wire unit, the center of the center of trifid structure metal wire unit and dorsad trifid structure metal wire unit is at same level height, distance between trifid structure metal wire unit is identical, and the distance between trifid structure metal wire unit is identical dorsad.
2. a kind of two-band cross-couplings periodic array left-handed materials dorsad as claimed in claim 1, the dielectric constant that it is characterized in that described microwave dielectric material substrate is 2.2～16; Thickness is 0.2～3mm.
3. a kind of two-band cross-couplings periodic array left-handed materials dorsad as claimed in claim 2, the dielectric constant that it is characterized in that described microwave dielectric material substrate is 4.4 ± 5%; Thickness is 0.4 ± 5%mm.
4. a kind of two-band cross-couplings periodic array left-handed materials dorsad as claimed in claim 1, it is characterized in that described trifid structure metal wire and the outside length of side a of trifid structure metal wire unit are dorsad 2.0～3.0mm, the length b of outer bottom edge is 1.0～2.5mm, center bar length of side c is 0.8～2.0mm, the width w on the each limit of metal wire is 0.05～0.25mm, and metal thickness is 0.01～0.03mm.
5. a kind of two-band cross-couplings periodic array left-handed materials dorsad as claimed in claim 4, it is characterized in that described trifid structure metal wire and the outside length of side a=3.0 ± 0.02mm of trifid structure metal wire unit dorsad, length=2.2 ± the 0.02mm of b outer bottom edge, center bar length of side c=1.6 ± 0.02mm, width w=0.2 ± the 0.02mm on the each limit of metal wire, metal thickness=0.018mm ± 5%.
6. the two-band preparation method of cross-couplings periodic array left-handed materials dorsad as described in as arbitrary in claim 1～5, is characterized in that comprising the following steps:
(1) adopt circuit board lithographic technique, carve forward and trifid structure metal wire cell array dorsad respectively in the dielectric material microwave base plate both side surface of the two-sided deposited good conductor of designed gauge, construction unit center distance is chosen 3～10mm according to design frequency range;
(2) geometry parameter changing in basic cell structure makes various different big or small construction units;
(3) the prepared cross-coupling unit array dielectric-slab that is distributed with periodically is dorsad cut into multiple unit and becomes the list structure of row, then place side by side and form two-dimentional two-band cross-couplings periodic array left-handed materials dorsad.
7. the two-band preparation method of cross-couplings periodic array left-handed materials dorsad as claimed in claim 6, is characterized in that in step (1), and described construction unit center distance is chosen 6.5 ± 0.5mm according to design frequency range.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299716A (en) * | 2016-10-14 | 2017-01-04 | 厦门大学 | The taper interdigital DNA double bionical LHM of spiral |
| CN107508017A (en) * | 2017-08-10 | 2017-12-22 | 杭州电子科技大学 | A kind of band inhales molded breadth band frequency selecting structures and its application |
| CN112467392A (en) * | 2020-11-17 | 2021-03-09 | 厦门大学 | Centrosymmetric pi-shaped single-edge multi-frequency left-handed material |
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| US20100141358A1 (en) * | 2005-01-18 | 2010-06-10 | University Of Massachusetts Lowell | Chiral Metamaterials |
| CN102983409A (en) * | 2012-12-11 | 2013-03-20 | 电子科技大学 | High-transmissivity flat left-handed material |
| CN103346407A (en) * | 2013-06-15 | 2013-10-09 | 厦门大学 | Left-handed material formed by E-shaped mutually embedded structures and provided with double-rod-shaped tuning structure |
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2014
- 2014-02-08 CN CN201410045559.6A patent/CN103746190A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100141358A1 (en) * | 2005-01-18 | 2010-06-10 | University Of Massachusetts Lowell | Chiral Metamaterials |
| CN102983409A (en) * | 2012-12-11 | 2013-03-20 | 电子科技大学 | High-transmissivity flat left-handed material |
| CN103346407A (en) * | 2013-06-15 | 2013-10-09 | 厦门大学 | Left-handed material formed by E-shaped mutually embedded structures and provided with double-rod-shaped tuning structure |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106299716A (en) * | 2016-10-14 | 2017-01-04 | 厦门大学 | The taper interdigital DNA double bionical LHM of spiral |
| CN106299716B (en) * | 2016-10-14 | 2019-05-28 | 厦门大学 | The interdigital bionical left-handed material of DNA double spiral of cone cell |
| CN107508017A (en) * | 2017-08-10 | 2017-12-22 | 杭州电子科技大学 | A kind of band inhales molded breadth band frequency selecting structures and its application |
| CN112467392A (en) * | 2020-11-17 | 2021-03-09 | 厦门大学 | Centrosymmetric pi-shaped single-edge multi-frequency left-handed material |
| CN112467392B (en) * | 2020-11-17 | 2021-09-07 | 厦门大学 | Centrosymmetric pi-shaped single-edge multi-frequency left-handed material |
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Application publication date: 20140423 |