CN101499550B - Low loss adjustable band-pass filter based on left hand characteristic - Google Patents
Low loss adjustable band-pass filter based on left hand characteristic Download PDFInfo
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- CN101499550B CN101499550B CN 200910079153 CN200910079153A CN101499550B CN 101499550 B CN101499550 B CN 101499550B CN 200910079153 CN200910079153 CN 200910079153 CN 200910079153 A CN200910079153 A CN 200910079153A CN 101499550 B CN101499550 B CN 101499550B
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Abstract
The invention relates to a low-loss adjustable band-pass filter based on characteristics of the left-handed, and belongs to the field of a microwave component. The low-loss adjustable band-pass filter has a sandwich structure of ferrite/dielectric/ferrite; the thickness ratio of the three layers is 1 to (0.01 to 3) to 1; the resonant coupling of the two ferrite layers can realize the microwave transmission band with the left-handed characteristics; an external magnetic field can be used for the real-time regulation and control of the working frequency range of the microwave transmission band; and the structural parameters can be changed to effectively adjust the width and the insertion loss of the transmission band. The adjustable band-pass filter has the advantage of ultra-low loss which can be as low as below 1 dB; the real-time regulation of the working frequency range of the microwave transmission band can be realized; and the width and the insertion loss of the transmission band depend on the structural parameters. The adjustable band-pass filter has the advantages of simple structure, convenient application, easy production and convenient maintenance.
Description
Technical field
The invention belongs to the microwave device field, particularly a kind of low loss adjustable band-pass filter that utilizes left hand characteristic to realize.
Background technology
Nineteen sixty-eight, the scientist Veselago of the former Soviet Union proposes to have simultaneously the material of negative permittivity and negative magnetoconductivity theoretically, have negative refraction coefficient, evanescent wave amplification, reversed Doppler effect etc. totally different in the physical characteristic of traditional electrical magnetizing mediums, because electromagnetic direction of an electric field, magnetic direction and wave vector direction are left-handed coordinate system in this material, therefore this material is known as left-handed materials (Left-Handed Material, LHM).2000, the human metal wires such as the Smith of the U.S. (Metallic wires) and split ring resonator (Split-ring Resonator, SRR) array produces first left-handed materials with negative refractive index, has caused the huge vibrations of international academic community.Utilize the unusual electromagnetic property of left-handed materials can break through the physics limit of traditional sucrose, realize many novel capabilities, when therefore the correlative study of material is still far from perfect leftward, the world communication industry circle (material manufacturer, wireless device manufacturer, and large-size machine manufacturer etc.) just begun to step up to research and develop the novel microwave device that adopts left-handed materials, utilize left-handed materials to realize the microwave devices such as novel high directivity antenna, adjustable antenna cover, microwave filter, trapper, coupler.
At present, utilize left-handed materials to realize that various adjustable microwave devices enjoy communication industry circle to pay close attention to.Shadrivov (Optics Express 2006, v 14, p9345) and the people such as Chen (Applied Physics Letter 2006, v89, p3509) propose respectively in the SRR structure, to add variable capacitance diode and regulate its frequency characteristic; Degiron (OpticsExpress 2007, v15, p1115) imagination is introduced the adjustable semiconductor of conductivity and is realized adjustable left-handed materials in the SRR structure; The people such as Zhao Qian (Applied Physics Letter 2007, v90, p1112) propose the SRR structure is immersed among the liquid crystal, the frequency adjustability of the dielectric constant implementation structure by the extra electric field adjustable liquid crystal display.But add the complexity that adjustable device will increase structure greatly, and liquid crystal has flowability and corrosivity, this all brings great difficulty to the practical application of adjustable left-handed materials.In addition, SRR structure left-handed materials is utilized electric resonance and the overlapping realization left hand characteristic of magnetic resonance, and the high loss that is therefore caused by resonance dispersion is the unavoidable difficult problem of such left-handed materials, and this has had a strong impact on the application performance of left-handed materials.Therefore, exploitation low-loss adjustable microwave device has become the difficult problem that the industry urgent need is captured.
Summary of the invention
The purpose of this invention is to provide a kind of variable band-pass filter simple in structure, low-loss, can be used for filtering special frequency channel microwave signal in addition, guarantee the transmission quality of data-signal in the frequency range, and the working band of filter is adjustable in real time.
A kind of variable band-pass filter of the present invention is characterised in that: variable band-pass filter is made of ferrite and dielectric material, its structure is ferrite/dielectric material/ferritic sandwich structure, wherein dielectric layer is between two identical ferrite layers, and this structure is utilized the resonance coupling between two-layer ferrite to produce left hand characteristic and realized the microwave passband.
The Thickness Ratio of trilaminate material is 1 in the sandwich structure of described filter: (0.01～3): 1, and by changing passband width and the insertion loss of thickness of dielectric layers tunable filter, thickness of dielectric layers is less, and bandwidth is larger, loss is lower; Used ferrite can produce ferromagnetic resonance in this filter under the acting in conjunction that adds permanent magnetic field and microwave field, and ferromagnetic resonance frequency will determine the working frequency range of band pass filter.
Used dielectric material is non magnetic, insulation, dielectric material in the described filter, and its magnetic permeability is 1, and magnetic loss is less than 0.0001, and dielectric constant is 1～20, and dielectric loss is lower than 0.1, and resistivity is higher than 1 * 10
12Ω cm satisfies the macromolecular material of above-mentioned performance requirement or the dielectric layer that ceramic material all can be used as this sandwich structure.
Variable band-pass filter of the present invention is by applying the microwave passband frequency range that externally-applied magnetic field can this filter of real-time monitoring, and externally-applied magnetic field intensity is higher, and the filter working frequency range is higher; This filter can be used for the bandpass filtering of microwave signal, can filter working frequency range microwave signal in addition, guarantee data-signal transmission quality in the working frequency range, and the insertion loss of working band be low, can be low to moderate below the 1dB, can effectively guarantee the signal strength signal intensity of data-signal in the working frequency range.
Beneficial effect of the present invention is: 1) low-loss: only utilize double-deck ferritic magnetic resonance coupling to realize that namely left hand characteristic forms the microwave passband, and do not adopt the traditional approach of electric resonance and the overlapping realization left hand characteristic of magnetic resonance, thereby realized low-loss, the insertion loss of microwave passband can be low to moderate below the 1dB; 2) working band is easy to adjust: the working frequency range that gets final product real-time monitoring microwave passband by the intensity that changes external magnetic field; 3) simple in structure, with low cost: this filter adopts sandwich structure, and integral device is simple in structure, is easy to produce, and be convenient to safeguard, and core component is ferrite and dielectric material, is mature production technology, cheap material.
Description of drawings
Fig. 1 is the structural representation of variable band-pass filter, and wherein 1 is ferrite, the 2nd, and dielectric layer.
Fig. 2 is the microwave transmission spectrum of band pass filter under the different magnetic field condition.
Fig. 3 is that the filter passband centre frequency is with the variation diagram of external magnetic field intensity.
Fig. 4 is that structural parameters change the impact on sample microwave transmission characteristic.
Embodiment
Embodiment 1:
The solid phase ceramic process of employing standard prepares Ba
2Co
2Fe
12O
22Ferrite substrate becomes the ferrite retrofit behind the sintering to be of a size of the sheet sample of 22mm * 10mm * 4mm, inserts the Al of size 22mm * 10mm * 1mm between two ferrites
2O
3As dielectric layer, its magnetic permeability is 1, and magnetic loss is less than 0.0001, and dielectric constant is 6, dielectric loss 0.001, and resistivity is higher than 1 * 10
12Ω cm, two ferrites and Al
2O
3Layer fits tightly and forms the sandwich structure filter.With pack into standard rectangular waveguide test of filter, adopt mode shown in Figure 1 that filter is applied external magnetic field, utilize vector network analyzer to test its microwave filtering characteristic, acquired results is as shown in Figure 2.Gained microwave passband width is 1GHz approximately, and insertion loss can be low to moderate below the 1dB.The working frequency range of microwave passband is with rising on the external magnetic field strength increase, and this filter has excellent frequency band tunable characteristic.
Embodiment 2:
The solid phase ceramic process of employing standard prepares Ba
2Co
2Fe
12O
22Ferrite substrate, ferrite retrofit behind the sintering is become to be of a size of the sheet sample of 22mm * 10mm * 4mm, between two ferrites, insert the Teflon of size 22mm * 10mm * 2mm as dielectric layer, its magnetic permeability is 1, magnetic loss is less than 0.0001, dielectric constant is 2.6, dielectric loss 0.0001, and resistivity is higher than 1 * 10
12Ω cm, two ferrites and Teflon layer fit tightly and form the sandwich structure filter, with the filter standard rectangular waveguide test of packing into, obtain its microwave filtering characteristic, and the microwave passband width is 1GHz approximately, and insertion loss can be low to moderate below the 1dB.The working frequency range of microwave passband is with rising on the external magnetic field strength increase, and passband central frequency illustrates that this filter has excellent frequency band tunable characteristic with the Changing Pattern of external magnetic field as shown in Figure 3.
Embodiment 3:
The solid phase ceramic process of employing standard prepares Ba
2Co
1.6Cu
0.4Fe
12O
22Ferrite substrate becomes the ferrite retrofit behind the sintering to be of a size of the sheet sample of 22mm * 10mm * 4mm, inserts polymethyl methacrylate as dielectric layer between two ferrites, its magnetic permeability is 1, and magnetic loss is less than 0.0001, and dielectric constant is 4, dielectric loss 0.01, resistivity is higher than 1 * 10
12Ω cm, two ferrites and polymethyl methacrylate fit tightly and form the sandwich structure filter.Change the dielectric layer in the sandwich structure, adopt respectively polymethyl methacrylate and the ferrite layer of 22mm * 10mm * 0.1mm, 22mm * 10mm * 1mm, 22mm * 10mm * 2mm, 22mm * 10mm * 4mm compound, obtain the series of experiments sample, test the microwave transmission characteristic of these samples, the result as shown in Figure 4.With the increase of thickness of dielectric layers, the filter passband width reduces, and insertion loss increases.Passband width and the insertion loss of filter can be effectively regulated by the change structure parameter in this demonstration.
Claims (3)
1. low loss adjustable band-pass filter based on left hand characteristic, it is characterized in that, consisted of by ferrite and dielectric material, its structure is ferrite/dielectric material/ferritic sandwich structure, wherein dielectric layer utilizes the resonance coupling between two-layer ferrite to produce left hand characteristic realization microwave passband between two identical ferrite layers;
Described dielectric material is non magnetic, insulation, dielectric material, and its magnetic permeability is 1, and magnetic loss is less than 0.0001, and dielectric constant is 2.6-6, and dielectric loss is 0.0001-0.01, and resistivity is higher than 1 * 10
12Ω cm.
2. the low loss adjustable band-pass filter based on left hand characteristic as claimed in claim 1 is characterized in that, the Thickness Ratio of trilaminate material is 1 in the sandwich structure of described filter: (0.025～1): 1.
3. the low loss adjustable band-pass filter based on left hand characteristic as claimed in claim 1 is characterized in that, dielectric material is selected macromolecular material or the ceramic material that satisfies above-mentioned performance requirement.
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| CN 200910079153 CN101499550B (en) | 2009-03-03 | 2009-03-03 | Low loss adjustable band-pass filter based on left hand characteristic |
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| CN 200910079153 CN101499550B (en) | 2009-03-03 | 2009-03-03 | Low loss adjustable band-pass filter based on left hand characteristic |
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| CN101499550A CN101499550A (en) | 2009-08-05 |
| CN101499550B true CN101499550B (en) | 2013-03-27 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071774A2 (en) * | 2000-03-17 | 2001-09-27 | The Regents Of The University Of California | Left handed composite media |
| CN1787277A (en) * | 2005-11-25 | 2006-06-14 | 中国科学院物理研究所 | Adjustable band-pass filter with iron electric diaphragm |
| CN101017922A (en) * | 2006-12-11 | 2007-08-15 | 电子科技大学 | Static magnetic surface wave band pass filter |
| CN101262084A (en) * | 2008-04-14 | 2008-09-10 | 北京科技大学 | An adjustable microwave left hand material including high-frequency soft magnetic ferrite |
-
2009
- 2009-03-03 CN CN 200910079153 patent/CN101499550B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001071774A2 (en) * | 2000-03-17 | 2001-09-27 | The Regents Of The University Of California | Left handed composite media |
| CN1787277A (en) * | 2005-11-25 | 2006-06-14 | 中国科学院物理研究所 | Adjustable band-pass filter with iron electric diaphragm |
| CN101017922A (en) * | 2006-12-11 | 2007-08-15 | 电子科技大学 | Static magnetic surface wave band pass filter |
| CN101262084A (en) * | 2008-04-14 | 2008-09-10 | 北京科技大学 | An adjustable microwave left hand material including high-frequency soft magnetic ferrite |
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