CN104409818A - Ferrite-based metamaterial for adjustable band-stop filter and application of ferrite-based metamaterial - Google Patents
Ferrite-based metamaterial for adjustable band-stop filter and application of ferrite-based metamaterial Download PDFInfo
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- CN104409818A CN104409818A CN201410718264.0A CN201410718264A CN104409818A CN 104409818 A CN104409818 A CN 104409818A CN 201410718264 A CN201410718264 A CN 201410718264A CN 104409818 A CN104409818 A CN 104409818A
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Abstract
The invention discloses a ferrite-based metamaterial for an adjustable band-stop filter and application of the ferrite-based metamaterial. The ferrite-based metamaterial is formed by periodically arraying structural units consisting of single ferrite sticks, and a distance between every two adjacent structural units is the same and is smaller than a wavelength of an electromagnetic wave; the magnetization directions of the single ferrite sticks are parallel to the length directions of the sticks; the length directions of the ferrite sticks are perpendicular to the transmission direction of the electromagnetic wave and are parallel to an electric field component of the electromagnetic wave; the periodic arraying is specifically matrix type arraying. The negative effective magnetic conductivity frequency domain of the ferrite-based metamaterial can be adjusted by changing parameters such as an external bias magnetic field, a magnetocrystalline anisotropy field of ferrite, a shape demagnetizing field and saturation magnetization intensity, so that the frequency domain appearing in a forbidden band is controlled; the ferrite-based metamaterial can be applied to the aspects such as the adjustable band-stop filter.
Description
Technical field
The invention belongs to optical communication, photoelectron technical field, particularly a kind of ferrite base Meta Materials for tunable band-stop filter and application thereof.
Background technology
Along with the development of Modern information science and technology, microwave telecommunication system and device are developed rapidly.As a kind of microwave device of He Ne laser function, microwave filter plays vital effect in various communication system.Along with progressively going deep into of microwave technique application, the microwave device of various frequency range occurs in succession, and frequency band distribution is day by day intensive.Microwave spectrum is as the resource of a kind of " non-renewable ", and taken by various communication system, the interval between the frequency band that each communication system is used is more and more less.Therefore, not overlapping in order to ensure signal band between each communication system, do not disturb, system designer is sought to widen frequency on the one hand, on the other hand to frequency selector--the performance of microwave filter is had higher requirement, namely except meeting good frequency selective characteristic, also require that filter has other good characteristics, as little in filter with low insertion loss, volume, low cost, working stability, the characteristic such as outfield is adjustable.Various microwave filter can be divided into multiple type by different standards, and one of them is exactly band stop filter.The same with the filter of other kinds, band stop filter plays very important effect equally in various microwave telecommunication system, and its filtering performance directly has influence on the performance of system.
Along with the propelling of IT application process, electromagnetic environment is more and more complicated, and microwave system is subject to extraneous signal and disturbs oneself not rarely seen.When having stronger interference at certain or certain several frequency place of signal, certain means of employing suppress these interference by researcher.In this case, with the band pass filter with wider rejection band, interference signal is suppressed, while filtering interfering, also the useful signal within the scope of certain frequency may be curbed, therefore, if adopt one or more band stop filter, make its stopband just be positioned at interference signal frequency place, suppress interference signal can more flexibly effectively by this way.Therefore, further investigation is carried out to band stop filter structure and method for designing necessary, and significant.Conventional method is fixed band stop filter in receive path front end, but day by day severe and complicated along with electromagnetic environment, as the disturbance signal from different target may occur at any time, it comprises the interference signal of different frequency point, different bandwidth, at this moment adopts fixed filters just to seem unable to do what one wishes.Along with increasing of potential interfering frequency point, required fixing band stop filter is also just more, thus cause the volume of device to increase and loss increase, and it also requires that interference signal must be the signal of system known exact parameters when dispatching from the factory, and in reality fight, interference signal occurs at random in full frequency band range, and this all will cause system possibly cannot normally work.The quality of performance of filter is determined by the resonance the subject of knowledge and the object of knowledge of dielectric resonance to a great extent.Therefore, designing and prepare a kind of resonant material for tunable band-stop filter, being of great immediate significance for eliminating random interfering signal in modern microwave communication field.
Summary of the invention
The object of this invention is to provide a kind of ferrite base Meta Materials for tunable band-stop filter and application thereof.
Ferrite base Meta Materials provided by the invention, the construction unit periodic arrangement be made up of single ferrite bar forms; And spacing between adjacent two construction units is identical, and be all less than electromagnetic wavelength.
In above-mentioned ferrite base Meta Materials, the material forming described ferrite bar is soft magnetic ferrite, is specifically selected from least one in yttrium iron garnet (YIG) ferrite, MnZn (MnZn) ferrite and nickel zinc (NiZn) ferrite.
Spacing between described adjacent two construction units is less than 1/2 of electromagnetic wavelength;
Described periodic arrangement is matrix arrangement;
Described ferrite base Meta Materials also comprises several for supporting the supporting bracket of described single ferrite bar, and each supporting bracket is placed several single ferrite bars; Spacing between adjacent shore plates is identical, and identical with the spacing of adjacent two construction units;
Because the spacing of two adjacent structural units of described ferrite base Meta Materials is much smaller than electromagnetic wavelength, effectively " evenly " medium can be regarded as according to effective media theory.
The material forming described supporting bracket is polytetrafluoroethylene.
Above-mentioned ferrite base Meta Materials can obtain according to the method comprised the steps:
1) ferrite block is cut into rod-like samples;
2) polytetrafluoroethylene block cutting is become tabular;
3) ferrite bar is evenly attached on polyfluortetraethylene plate at a certain distance; Distance on polyfluortetraethylene plate between adjacent ferrite bar is less than electromagnetic wavelength, the polyfluortetraethylene plate of ferrite bar there is to line up sticking of some again, distance between adjacent panels is equal with the distance between adjacent ferrite bar, obtains above-mentioned ferrite base Meta Materials.
Wherein, the number of polyfluortetraethylene plate can be determined as the dimensional requirement of filter according to tunable microwave device.
In addition, the tunable microwave device containing above-mentioned ferrite base Meta Materials, also belongs to protection scope of the present invention, and wherein, described tunable microwave device is band stop filter, is specially tunable band-stop filter.
The ferrite base Meta Materials that the invention described above provides or the application of tunable microwave device in microwave modulation, also belong to protection scope of the present invention.
Wherein, described microwave modulation comprises the steps: described ferrite base Meta Materials or described tunable microwave device to be placed in magnetic field and electromagnetic wave, and makes the length direction of described ferrite bar perpendicular to electromagnetic wave propagation direction and be parallel to electromagnetic electric field component;
The direction of magnetization of described ferrite bar is the length direction being parallel to described ferrite bar.
Ferrite base Meta Materials for tunable band-stop filter of the present invention is formed by ferrite bar periodic arrangement.Under applied bias magnetic field and electromagnetic effect, can there is ferromagnetic resonance phenomenon in ferrite.Higher than within the scope of the certain frequency of ferromagnetic resonance frequency, the effective permeability of ferrite base Meta Materials is negative value.Effective dielectric constant due to ferrite base Meta Materials be on the occasion of, now, electromagnetic wave cannot be propagated in ferrite base Meta Materials, occurs forbidden band.In addition, ferritic ferromagnetic resonance frequency and applied bias magnetic field, ferritic magnetocrystalline anisotropy field, shape demagnetizing field are relevant with saturation magnetization.By changing the control that these parameters can realize ferromagnetic resonance, thus regulating the negative effective permeability frequency domain of ferrite base Meta Materials, realizing the frequency domain regulating forbidden band to occur.The invention provides many adjustable ferrite base Meta Materials, can be applicable to the aspects such as tunable band-stop filter.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention for the ferrite base Meta Materials of tunable band-stop filter;
The scattering parameter S of Fig. 2 to be the saturation magnetization of different external magnetic field size in the embodiment of the present invention 1 be ferrite base Meta Materials of 1800Oe
21amplitude curve;
The scattering parameter S of Fig. 3 to be the saturation magnetization of different external magnetic field size in the embodiment of the present invention 2 be ferrite base Meta Materials of 2000Oe
21amplitude curve;
Embodiment
Below in conjunction with specific embodiment, the present invention is further elaborated, but the present invention is not limited to following examples.Described method is conventional method if no special instructions.Described raw material all can obtain from open commercial sources if no special instructions.
Embodiment 1
First, 1 × 1 × 10mm will be of a size of
3, saturation magnetization is that 1800Oe is attached on the one side of polyfluortetraethylene plate by the ferrite bar formed from yttrium iron garnet ferrite, interrod spacing is 5mm, then, the polyfluortetraethylene plate of ferrite bar is had to be that intervals arranges with 5mm by sticking, obtain ferrite base Meta Materials, its structure as shown in Figure 1.
Ferrite base Meta Materials is placed in WR90 type rectangular waveguide, the length direction of ferrite bar is perpendicular to electromagnetic wave propagation direction and be parallel to electromagnetic electric field component, the direction of magnetization of ferrite bar is the length direction being parallel to ferrite bar, utilizes vector network analyzer to carry out electromagnetic scattering parameter testing to it.
Figure 2 shows that the saturation magnetization of different external magnetic field size is the scattering parameter S of the ferrite base Meta Materials of 1800Oe
21amplitude curve.When without externally-applied magnetic field, the scattering parameter S of ferrite base Meta Materials
21not there is forbidden band in amplitude curve, this is because without external magnetic field time, not there is ferromagnetic resonance in ferrite, the dielectric constant of ferrite base Meta Materials and magnetic permeability be all on the occasion of, electromagnetic wave can pass through.When there being applied bias magnetic field, the scattering parameter S of ferrite base Meta Materials
21there is an obvious forbidden band in amplitude curve, this is because ferrite there occurs ferromagnetic resonance, the dielectric constant of ferrite base Meta Materials on the occasion of and magnetic permeability is negative value, electromagnetic wave cannot pass through.In addition, as can be seen from the figure, along with the increase in applied bias magnetic field, forbidden band frequency domain, gradually to high-frequency mobile, shows good magnetic field tunable performance, proves that this ferrite base Meta Materials can be used for tunable band-stop filter.
Embodiment 2
First, 1 × 1 × 10mm will be of a size of
3, saturation magnetization be 2000Oe by the ferrite bar formed from yttrium iron garnet ferrite to be attached on the one side of polyfluortetraethylene plate, interrod spacing is 5mm, then, the polyfluortetraethylene plate of ferrite bar is had to be that intervals arranges with 5mm by sticking, obtain ferrite base Meta Materials, its structure as shown in Figure 1.
Ferrite base Meta Materials is placed in WR90 type rectangular waveguide, the length direction of ferrite bar is perpendicular to electromagnetic wave propagation direction and be parallel to electromagnetic electric field component, the direction of magnetization of ferrite bar is the length direction being parallel to ferrite bar, utilizes vector network analyzer to carry out electromagnetic scattering parameter testing to it.
Figure 3 shows that the saturation magnetization of different external magnetic field size is the scattering parameter S of the ferrite base Meta Materials of 2000Oe
21amplitude curve.When without externally-applied magnetic field, the scattering parameter S of ferrite base Meta Materials
21not there is forbidden band in amplitude curve, this is because without external magnetic field time, not there is ferromagnetic resonance in ferrite, the dielectric constant of ferrite base Meta Materials and magnetic permeability be all on the occasion of, electromagnetic wave can pass through.When there being applied bias magnetic field, the scattering parameter S of ferrite base Meta Materials
21there is an obvious forbidden band in amplitude curve, this is because ferrite there occurs ferromagnetic resonance, the dielectric constant of ferrite base Meta Materials on the occasion of and magnetic permeability is negative value, electromagnetic wave cannot pass through.In addition, as can be seen from the figure, along with the increase in applied bias magnetic field, forbidden band frequency domain, gradually to high-frequency mobile, shows good magnetic field tunable performance, proves that this ferrite base Meta Materials can be used for tunable band-stop filter.
Claims (7)
1. a ferrite base Meta Materials, the construction unit periodic arrangement be made up of single ferrite bar forms; And spacing between adjacent two construction units is identical, and be all less than electromagnetic wavelength.
2. ferrite base Meta Materials according to claim 1, is characterized in that: the material forming described ferrite bar is soft magnetic ferrite, is specifically selected from least one in yttrium iron garnet ferrite, manganese-zinc ferrite and nickel-zinc ferrite;
Spacing between described adjacent two construction units is less than 1/2 of electromagnetic wavelength;
Described periodic arrangement is matrix arrangement.
3. ferrite base Meta Materials according to claim 1 and 2, is characterized in that: described ferrite base Meta Materials also comprises several for supporting the supporting bracket of described single ferrite bar; Spacing between adjacent shore plates is identical, and identical with the spacing of adjacent two construction units;
The material forming described supporting bracket is polytetrafluoroethylene.
4. the tunable microwave device containing the arbitrary described ferrite base Meta Materials of claim 1-3.
5. tunable microwave device according to claim 4, is characterized in that: described tunable microwave device is band stop filter, is specially tunable band-stop filter.
6. the application of tunable microwave device described in the arbitrary described ferrite base Meta Materials of claim 1-3 or claim 4 or 5 in microwave modulation.
7. application according to claim 6, it is characterized in that: described microwave modulation comprises the steps: tunable microwave device described in arbitrary for claim 1-3 described ferrite base Meta Materials or claim 4 or 5 to be placed in magnetic field and electromagnetic wave, and makes the length direction of described ferrite bar perpendicular to electromagnetic wave propagation direction and be parallel to electromagnetic electric field component;
The direction of magnetization of described ferrite bar is the length direction being parallel to described ferrite bar.
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| CN101242021A (en) * | 2008-01-25 | 2008-08-13 | 清华大学 | Electromagnetic response behavior adjustment and control method for magnetic field negative conductivity material based on magnetic material |
| US20120194291A1 (en) * | 2011-02-01 | 2012-08-02 | Cisco Technology, Inc. | COMMON-MODE SUPPRESSION FILTER FOR MICROSTRIP 10-Gb/s DIFFERENTIAL LINES |
| US20130088090A1 (en) * | 2011-10-07 | 2013-04-11 | Utah State University Research Foundation | Wireless power transfer magnetic couplers |
| CN103219572A (en) * | 2013-04-18 | 2013-07-24 | 南京大学 | Microwave band-pass filter |
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- 2014-12-01 CN CN201410718264.0A patent/CN104409818A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242021A (en) * | 2008-01-25 | 2008-08-13 | 清华大学 | Electromagnetic response behavior adjustment and control method for magnetic field negative conductivity material based on magnetic material |
| US20120194291A1 (en) * | 2011-02-01 | 2012-08-02 | Cisco Technology, Inc. | COMMON-MODE SUPPRESSION FILTER FOR MICROSTRIP 10-Gb/s DIFFERENTIAL LINES |
| US20130088090A1 (en) * | 2011-10-07 | 2013-04-11 | Utah State University Research Foundation | Wireless power transfer magnetic couplers |
| CN103219572A (en) * | 2013-04-18 | 2013-07-24 | 南京大学 | Microwave band-pass filter |
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| Title |
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| KE BI: "Tunable dual-band negative refractive index in ferrite-based metamaterials", 《OPTICS EXPRESS》 * |
| 毕科: "基于铁磁共振的超材料研究进展", 《中国科学》 * |
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