CN103219572B - Microwave band-pass filter - Google Patents
Microwave band-pass filter Download PDFInfo
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- CN103219572B CN103219572B CN201310135617.XA CN201310135617A CN103219572B CN 103219572 B CN103219572 B CN 103219572B CN 201310135617 A CN201310135617 A CN 201310135617A CN 103219572 B CN103219572 B CN 103219572B
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- pass filter
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- filter
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- photonic crystal
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Abstract
The invention discloses a kind of microwave band-pass filter, comprise the base material being provided with through hole and the magnetic photonic crystal be made up of multiple permanent-magnet ferrite post, described permanent-magnet ferrite is arranged in through hole.Microwave band-pass filter of the present invention has bandwidth, and Out-of-band rejection is high, smoothly in band waits filtering characteristic, also have that little, the structure of volume is simple simultaneously, handling ease, with low cost, be easy to the advantages such as realization.
Description
Technical field
The present invention relates to a kind of band pass filter, specifically a kind of microwave band-pass filter, more specifically a kind of magnetic photonic crystal band pass filter.
Background technology
In high performance communication system, the filter of low-loss and high power capacity has very important effect.In order to ensure the distortionless transmission of signal waveform, in little squareness factor and band, smooth high performance filter is absolutely necessary one of device.In recent years, along with broadband communications technologies receives increasing attention, the application of broadband filter becomes more and more important.The broadband filter of microwave section can be realized by various structures, and as microstrip line, waveguide etc., but the filter of these structures is not often complex structure, and to involve great expense be exactly that performance is excellent not, can not meet the requirement of practical application to high performance wideband filter.
Summary of the invention
Goal of the invention: for above-mentioned prior art Problems existing and deficiency, the object of this invention is to provide a kind of structure simple, realize high performance microwave band pass filter easily.
Technical scheme: for achieving the above object, the technical solution used in the present invention is a kind of microwave band-pass filter, and comprise the base material being provided with through hole and the magnetic photonic crystal be made up of multiple permanent-magnet ferrite, described permanent-magnet ferrite is arranged in through hole.
Further, the typical material of described permanent-magnet ferrite is strontium ferrite.
Further, the shape of described permanent-magnet ferrite is column, is typically cylinder.
Further, described multiple permanent-magnet ferrite composition rule array, is typically foursquare array.
Further, the typical material of described base material is foam.
Further, the dielectric constant of described base material is between 1.05-1.1.
Further, the upper surface of described base material and lower surface are respectively equipped with cover plate.Further, the material of described cover plate is metal.
Further, the shape of described base material is rectangle.Further, the shape of described base material is square; Described base material is provided with absorbing material in the both sides perpendicular to microwave propagation direction.
The material changing the radius of permanent-magnet ferrite or the lattice constant of magnetic photonic crystal or base material can design the microwave band-pass filter being operated in different frequency range, having different bandwidth.Filtering performance is also relevant with the size of magnetic photonic crystal.
Operation principle: the band structure of photonic crystal uniqueness makes the Out-of-band rejection of photon crystal filter can reach more than 30dB easily, permanent-magnet ferrite material has high refractive index, make magnetic photonic crystal want large with the photonic crystal of the simple dielectric material of the contrast ratio of its background material, thus magnetic photonic crystal filter can have wider bandwidth of operation.The operating frequency of magnetic photonic crystal is away from ferromagnetic resonance frequency simultaneously, and therefore the loss of material is less, also just makes magnetic photonic crystal filter have little insertion loss.Therefore, the band pass filter based on magnetic photonic crystal of the present invention has the series of advantages such as insertion loss is low, Out-of-band rejection is large, squareness factor is little.
Beneficial effect: the present invention proposes a kind of magnetic photonic crystal band pass filter (being called for short " band pass filter " or " filter ") be made up of permanent-magnet ferrite.This band pass filter not only has that squareness factor is little, smooth and in-band insertion loss is low, Out-of-band rejection advantages of higher in bandwidth, band, and also have that volume is little, structure simple, handling ease, with low cost, be easy to the advantages such as realization.The filter of different frequency range different bandwidth can be designed by changing the radius of magnetic cylinder or the lattice constant of magnetic photonic crystal or the material of base material.Owing to have employed permanent-magnet ferrite material, filter does not need applied bias magnetic field, and this is provide application conditions very easily based on the practical application of the microwave device of magnetic photonic crystal.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention, and the housing in figure is the profile of foam substrate.
Fig. 2 is S parameter simulation result figure of the present invention.
Fig. 3 shows the impact of lattice constant a on performance of filter of magnetic photonic crystal.
Fig. 4 shows the impact of radius r on performance of filter of magnetic cylinder.
Fig. 5 shows the impact of size on filtering performance of magnetic photonic crystal.
Fig. 6 is the measurement result figure of S21 parameter of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Fig. 1 shows microwave band-pass filter of the present invention, in the present embodiment, it mainly comprises the base material of a magnetic photonic crystal be made up of 5*5 strontium-permanent-magnet ferrite cylinder (being called for short " magnetic cylinder ") and foam, and strontium-permanent-magnet ferrite cylinder is arranged in the through hole of foam.Magnetic photonic crystal is cubic dot matrix, and a is lattice constant, and r is the radius of strontium-permanent-magnet ferrite cylinder, in the present embodiment, and a=8mm, r=2mm.The dielectric constant of strontium-permanent-magnet ferrite material is 21.5-0.2*i, and wherein i represents imaginary part, and it is essentially a constant in microwave section.
The S parameter simulation result of microwave band-pass filter when the array size that Fig. 2 shows magnetic photonic crystal is 8*8.Simulation result shows, the bandwidth range of filter-3dB, from 10.1GHz to 11.8GHz, has the bandwidth of nearly 1.7GHz, insertion loss is less than 4dB, Out-of-band rejection is greater than 60dB, and squareness factor (ratio of-40dB bandwidth sum-three dB bandwidth) is 1.68, and whole passband has good flatness.
The array size that Fig. 3 shows magnetic photonic crystal is 8*8, when keeping magnetic cylindrical radius r=2mm constant, changes the lattice constant a of magnetic photonic crystal to the impact of performance of filter.When lattice constant a is 6mm, 8mm, 10mm, the centre frequency of passband is respectively 11.2GHz, 10.95GHz, 10.8GHz, bandwidth is respectively 3GHz, 1.7GHz, 1.4GHz, and relative bandwidth is respectively 26.7%, 15.5%, 13.0%, and squareness factor is respectively 1.49,1.68,1.78.Increase lattice constant a, the centre frequency of filter and bandwidth will reduce, and squareness factor will increase, but the amplitude of variation of centre frequency and squareness factor is less.Change lattice constant a, the Out-of-band rejection of filter is also had a certain impact, but filter still has larger Out-of-band rejection and good inband flatness.Therefore, the lattice constant a of magnetic photonic crystal can be changed neatly, to meet the design requirement of the band pass filter of different bandwidth.
The array size that Fig. 4 shows magnetic photonic crystal is 8*8, when keeping the ratio r/a=0.25 of the radius of magnetic cylinder and photonic crystal lattice constant constant, change the radius r of magnetic cylinder to the impact of performance of filter.Can see, along with the reduction of radius r, band-pass filter frequency range will to high-frequency mobile.When radius r is taken as 4mm, 2mm, 1mm respectively, the centre frequency of passband is respectively 5.5GHz, 10.95GHz, 21.85GHz, bandwidth is respectively 1GHz, 1.7GHz, 3GHz, and relative bandwidth is respectively 18.2%, 15.5%, 13.7%, and squareness factor is respectively 1.5,1.68,1.9.Along with radius r geometric ratio reduce, the centre frequency geometric ratio of filter ground increases, and bandwidth is also in increase, but relative bandwidth reduces, and squareness factor increases slightly simultaneously, and the Out-of-band rejection of filter, inband flatness be not substantially by the impact of radius r.Therefore, ratio r/a can be changed neatly, to meet the design requirement of the band pass filter of different frequency bands.
Can be known by the result of calculation of Fig. 3 and Fig. 4, when designing magnetic photonic crystal band pass filter, can first according to the size of the demand determination magnetic cylindrical radius r of filter frequency range, and then according to the requirement of filtering bandwidth, determine the size of lattice constant a, thus just can design the band pass filter of any frequency range.
Fig. 5 shows and keeps magnetic cylindrical radius r=2mm, and when photonic crystal lattice constant a=8mm is constant, the array size of magnetic photonic crystal is on the impact of filtering performance.Along with the reduction of array, centre frequency and the bandwidth of filter remain unchanged, and Out-of-band rejection is in reduction, and squareness factor is in increase, and the flatness simultaneously in passband also decreases.When array size is reduced to 4*4 time, filter Out-of-band rejection is still greater than 30dB, and also still very well, and to be now only a length of side at xy section upper filter be the square of 32mm to inband flatness, is equivalent to the size of 1 yuan of coin.Therefore, adopt magnetic photonic crystal band pass filter while ensureing performance of filter, undersized filter can be built by the size reducing filter, that is, magnetic photonic crystal band pass filter can also have less size while the better performance of maintenance.
Fig. 6 shows the experimental measurements of microwave band-pass filter of the present invention.The array size of magnetic photonic crystal is 8*8.Length of side 64mm*64mm, be embedded in the foamed material of dielectric constant between 1.05-1.1, the upper and lower surface of foamed material is respectively equipped with metal cover board, and the metal cover board in figure is opened.Base material is provided with absorbing material in the both sides perpendicular to microwave propagation direction, and such as, see Fig. 1, microwave is propagated in the x-direction, then base material is provided with absorbing material in the both sides in y direction, and absorbing material can be foam type absorbing material.Measurement result shows, and between 10.1GHz-11.4GHz, filter has an insertion loss to be less than the passband of 5dB, and Out-of-band rejection is greater than 50dB, and squareness factor is 1.34, and the passband of filter has very good inband flatness simultaneously, meets high performance filtering requirements.Simulation and experiment is compared, and except in bandwidth, centre frequency slightly except difference, whole curve and the calculated results very well coincide.
Claims (6)
1. a microwave band-pass filter, it is characterized in that, comprise the base material being provided with through hole and the magnetic photonic crystal be made up of multiple permanent-magnet ferrite post, described permanent-magnet ferrite is arranged in through hole, the material of described base material is foam, upper surface and the lower surface of described base material are respectively equipped with metal cover board, and described base material is provided with absorbing material in the both sides perpendicular to microwave propagation direction.
2. microwave band-pass filter according to claim 1, it is characterized in that, the material of described permanent-magnet ferrite post is strontium ferrite.
3. microwave band-pass filter according to claim 1, it is characterized in that, the shape of described permanent-magnet ferrite post is cylinder.
4. microwave band-pass filter according to claim 1, it is characterized in that, described multiple permanent-magnet ferrite post forms foursquare array.
5. microwave band-pass filter according to claim 1, it is characterized in that, the dielectric constant of described base material is between 1.05-1.1.
6. microwave band-pass filter according to claim 1, it is characterized in that, the shape of described base material is rectangle.
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| CN201310135617.XA CN103219572B (en) | 2013-04-18 | 2013-04-18 | Microwave band-pass filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104409818A (en) * | 2014-12-01 | 2015-03-11 | 清华大学 | Ferrite-based metamaterial for adjustable band-stop filter and application of ferrite-based metamaterial |
| CN104377453B (en) * | 2014-12-09 | 2017-09-19 | 南京大学 | Frequency-adjustable directional radiation antenna |
| CN105846115B (en) * | 2016-04-07 | 2019-01-08 | 南京大学 | Directional diagram reconstructable directional radiation antenna |
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| CN1697248A (en) * | 2005-06-01 | 2005-11-16 | 东南大学 | Wave-guide integrated on substrate-electronic band gap band pass filter |
| CN1784810A (en) * | 2003-03-31 | 2006-06-07 | 哈里公司 | Arrangements of microstrip antennas having dielectric substrates including meta-materials |
| CN1906512A (en) * | 2004-01-22 | 2007-01-31 | 松下电器产业株式会社 | Optical device, and production method for photonic crystal slab |
| CN201741777U (en) * | 2010-02-26 | 2011-02-09 | 电子科技大学 | Metal photonic crystal filter |
| CN102269842A (en) * | 2011-07-18 | 2011-12-07 | 北京邮电大学 | Realization method of photonic crystal micro-cavity with high-quality factor |
| CN102770009A (en) * | 2011-05-04 | 2012-11-07 | 深圳光启高等理工研究院 | Wave-absorbing metamaterial |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6735368B2 (en) * | 1997-05-16 | 2004-05-11 | Mesophotonics Limited | Optical delay device |
| US7006052B2 (en) * | 2003-05-15 | 2006-02-28 | Harris Corporation | Passive magnetic radome |
| US6975279B2 (en) * | 2003-05-30 | 2005-12-13 | Harris Foundation | Efficient radome structures of variable geometry |
| US8149073B2 (en) * | 2007-08-03 | 2012-04-03 | Murata Manufacturing Co., Ltd. | Band-pass filter and method for making photonic crystal for the band-pass filter |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1784810A (en) * | 2003-03-31 | 2006-06-07 | 哈里公司 | Arrangements of microstrip antennas having dielectric substrates including meta-materials |
| CN1906512A (en) * | 2004-01-22 | 2007-01-31 | 松下电器产业株式会社 | Optical device, and production method for photonic crystal slab |
| CN1697248A (en) * | 2005-06-01 | 2005-11-16 | 东南大学 | Wave-guide integrated on substrate-electronic band gap band pass filter |
| CN201741777U (en) * | 2010-02-26 | 2011-02-09 | 电子科技大学 | Metal photonic crystal filter |
| CN102770009A (en) * | 2011-05-04 | 2012-11-07 | 深圳光启高等理工研究院 | Wave-absorbing metamaterial |
| CN102269842A (en) * | 2011-07-18 | 2011-12-07 | 北京邮电大学 | Realization method of photonic crystal micro-cavity with high-quality factor |
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