CN103219572A - Microwave band-pass filter - Google Patents
Microwave band-pass filter Download PDFInfo
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- CN103219572A CN103219572A CN201310135617XA CN201310135617A CN103219572A CN 103219572 A CN103219572 A CN 103219572A CN 201310135617X A CN201310135617X A CN 201310135617XA CN 201310135617 A CN201310135617 A CN 201310135617A CN 103219572 A CN103219572 A CN 103219572A
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- pass filter
- microwave band
- band
- filter
- photonic crystal
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- 230000005291 magnetic effect Effects 0.000 claims abstract description 37
- 239000004038 photonic crystal Substances 0.000 claims abstract description 32
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 33
- 239000011358 absorbing material Substances 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910052712 strontium Inorganic materials 0.000 claims description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical group [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 2
- 239000000758 substrate Substances 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000005764 inhibitory process Effects 0.000 description 5
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005350 ferromagnetic resonance Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The invention discloses a microwave band-pass filter which comprises a substrate with through holes and a magnetic photonic crystal which is composed of a plurality of permanent magnetic ferrite columns. The permanent magnetic ferrite columns are arranged in the through holes. The microwave band-pass filter has the filter characteristics of being wide in frequency band, high in out-of-band rejection, and smooth in band, and meanwhile has the advantages of being small in size, simple in structure, easy to process, low in cost, easy to achieve, and the like.
Description
Technical field
The present invention relates to a kind of band pass filter, specifically is a kind of microwave band-pass filter, more specifically is 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 crucial effect.In order to guarantee the distortionless transmission of signal waveform, smooth high performance filter one of device that is absolutely necessary in little squareness factor and the band.In recent years, along with the broadband connections technology has been subjected to increasing attention, the application of broadband filter becomes more and more important.The broadband filter of microwave section can be realized by multiple structure, and as microstrip line, waveguide etc., to involve great expense be exactly that performance is good inadequately but the filter of these structures often is not a complex structure, can not satisfy the requirement of practical application to the high performance wideband filter.
Summary of the invention
Goal of the invention: at the problem and shortage that above-mentioned prior art exists, the purpose of this invention is to provide a kind of simple in structure, 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, comprises base material that is provided with through hole and the magnetic photonic crystal of being made up of a plurality of permanent-magnet ferrites, and described permanent-magnet ferrite is arranged in through hole.
Further, the typical material of described permanent-magnet ferrite is a strontium ferrite.
Further, described permanent-magnet ferrite be shaped as column, be typically cylinder.
Further, described a plurality of permanent-magnet ferrite composition rule arrays are typically foursquare array.
Further, the typical material of described base material is a 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 a metal.
Further, described base material is shaped as rectangle.Further, described base material is shaped as square; Described base material is provided with absorbing material in the both sides perpendicular to the microwave propagation direction.
Change the radius of permanent-magnet ferrite or the lattice constant of magnetic photonic crystal or the material of base material and can design the microwave band-pass filter that is operated in different frequency range, has different bandwidth.Filtering performance is also relevant with the size of magnetic photonic crystal.
Operation principle: the band structure of photonic crystal uniqueness can reach more than the 30dB the outer inhibition of the band of photon crystal filter at an easy rate, permanent-magnet ferrite material has high refractive index, make magnetic photonic crystal want big, thereby the magnetic photonic crystal filter can have the bandwidth of operation of broad with the photonic crystal of the simple dielectric material of the contrast ratio of its background material.The operating frequency of while magnetic photonic crystal is away from ferromagnetic resonance frequency, so the loss of material is less, also just makes the magnetic photonic crystal filter have little insertion loss.Therefore, the band pass filter based on magnetic photonic crystal of the present invention has series of advantages such as the loss of insertion is low, the outer inhibition of band is big, squareness factor is little.
Beneficial effect: the present invention proposes a kind of magnetic photonic crystal band pass filter that is made of permanent-magnet ferrite (being called for short " band pass filter " or " filter ").This band pass filter has not only that squareness factor is little, smooth and in-band insertion loss is low, the outer advantages of higher that suppresses of band in the bandwidth, band, and also have that volume is little, simple in structure, handling ease, with low cost, be easy to advantage such as realization.The material of the radius by changing the magnetic cylinder or the lattice constant of magnetic photonic crystal or base material can be designed the filter of different frequency range different bandwidth.Owing to adopted permanent-magnet ferrite material, filter does not need to add bias magnetic field, and this provides application conditions very easily for the practical application based on the microwave device of magnetic photonic crystal.
Description of drawings
Fig. 1 is a structural representation of the present invention, and the housing among the figure is the profile of foam substrate.
Fig. 2 is S parameters simulation of the present invention figure as a result.
Fig. 3 shows the influence of the lattice constant a of magnetic photonic crystal to performance of filter.
Fig. 4 shows the influence of the radius r of magnetic cylinder to performance of filter.
Fig. 5 shows the influence of the size of magnetic photonic crystal to filtering performance.
Fig. 6 is the measurement result figure of S21 parameter of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used to the present invention is described and is not used in and limit the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims institute restricted portion to the modification of the various equivalent form of values of the present invention.
Fig. 1 shows microwave band-pass filter of the present invention, in the present embodiment, it mainly comprises one by 5*5 strontium-permanent-magnet ferrite cylinder (being called for short " magnetic the cylinder ") magnetic photonic crystal of formation and the base material of foam material, and strontium-permanent-magnet ferrite cylinder is arranged in the through hole of foam material.Magnetic photonic crystal is cubic dot matrix, and a is a 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 the microwave section.
The S parameters simulation result of microwave band-pass filter when the array size that Fig. 2 shows magnetic photonic crystal is 8*8.Simulation result shows that the bandwidth range of filter-3dB has the bandwidth of nearly 1.7GHz from 10.1GHz to 11.8GHz, insert loss less than 4dB, band is outer to be suppressed greater than 60dB, and squareness factor (40dB bandwidth and-ratio of 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 influence of the lattice constant a of magnetic photonic crystal to 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, outer inhibition also has certain influence to the band of filter, and outer inhibition reaches inband flatness preferably but filter still has bigger band.Therefore, can change the lattice constant a of magnetic photonic crystal neatly, with the design requirement of the band pass filter that satisfies different bandwidth.
The array size that Fig. 4 shows magnetic photonic crystal is 8*8,, when the radius of maintenance magnetic cylinder and the ratio r/a=0.25 of photonic crystal lattice constant are constant, change of the influence of the radius r of magnetic cylinder to performance of filter.Can see that along with reducing of radius r, the band-pass filter frequency range will move to high frequency.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 ground reduces, the centre frequency geometric ratio of filter ground increases, and bandwidth is also increasing, but relative bandwidth reduces, and squareness factor increases slightly simultaneously, and the influence that the band of filter suppresses outward, inband flatness is not subjected to radius r substantially.Therefore, can change ratio r/a neatly, with the design requirement of the band pass filter that satisfies different frequency bands.
Result of calculation by Fig. 3 and Fig. 4 can be known, when design magnetic photonic crystal band pass filter, can determine the size of magnetic cylindrical radius r earlier according to the demand of filter frequency range, and then according to the requirement of filtering bandwidth, determine the size of lattice constant a, thereby 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 was constant, the array size of magnetic photonic crystal was to the influence of filtering performance.Along with reducing of array, the centre frequency and the bandwidth of filter remain unchanged, and outer being suppressed at of band reduces, and squareness factor is increasing, and the flatness in the passband also decreases simultaneously.When array size was reduced to 4*4, the outer inhibition of filter band remained unchanged greater than 30dB, and inband flatness is also still fine, and this moment, filter on the xy section only was a square that the length of side is 32mm, was equivalent to the size of 1 yuan of coin.Therefore, adopt the magnetic photonic crystal band pass filter when guaranteeing performance of filter, to make up undersized filter by the size that reduces filter, that is to say that the magnetic photonic crystal band pass filter can also have less size when keeping better performance.
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 is embedded in the foamed material of dielectric constant between 1.05-1.1, and the upper and lower surface of foamed material is respectively equipped with metal cover board, and the metal cover board among the figure is opened.Base material is provided with absorbing material in the both sides perpendicular to the microwave propagation direction, and for example, referring to Fig. 1, microwave is propagated along the x direction, and then base material is provided with absorbing material in the both sides of y direction, and absorbing material can be the foam type absorbing material.Measurement result shows that between 10.1GHz-11.4GHz, filter has a passband that inserts loss less than 5dB, and band is outer to be suppressed 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.Experiment is compared with emulation, and except that on bandwidth, centre frequency slightly the difference, entire curve and Theoretical Calculation result very well coincide.
Claims (10)
1. a microwave band-pass filter is characterized in that, comprises base material that is provided with through hole and the magnetic photonic crystal of being made up of a plurality of permanent-magnet ferrite posts, and described permanent-magnet ferrite is arranged in through hole.
2. according to the described microwave band-pass filter of claim 1, it is characterized in that the material of described permanent-magnet ferrite post is a strontium ferrite.
3. according to the described microwave band-pass filter of claim 1, it is characterized in that, described permanent-magnet ferrite post be shaped as cylinder.
4. according to the described microwave band-pass filter of claim 1, it is characterized in that described a plurality of permanent-magnet ferrite posts constitute foursquare array.
5. according to the described microwave band-pass filter of claim 1, it is characterized in that the dielectric constant of described base material is between 1.05-1.1.
6. according to the described microwave band-pass filter of claim 1, it is characterized in that the material of described base material is a foam.
7. according to the described microwave band-pass filter of claim 1, it is characterized in that the upper surface and the lower surface of described base material are respectively equipped with cover plate.
8. according to the described microwave band-pass filter of claim 7, it is characterized in that the material of described cover plate is a metal.
9. according to the described microwave band-pass filter of claim 1, it is characterized in that, described base material be shaped as rectangle.
10. according to the described microwave band-pass filter of claim 9, it is characterized in that described base material is provided with absorbing material in the both sides perpendicular to the microwave propagation direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310135617.XA CN103219572B (en) | 2013-04-18 | 2013-04-18 | Microwave band-pass filter |
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| CN201310135617.XA CN103219572B (en) | 2013-04-18 | 2013-04-18 | Microwave band-pass filter |
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| CN103219572A true CN103219572A (en) | 2013-07-24 |
| CN103219572B CN103219572B (en) | 2015-10-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377453A (en) * | 2014-12-09 | 2015-02-25 | 南京大学 | Frequency-adjustable directed-radiation antenna |
| 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 |
| CN105846115A (en) * | 2016-04-07 | 2016-08-10 | 南京大学 | Pattern-reconfigurable directional radiation antenna |
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| US20030228096A1 (en) * | 1997-05-16 | 2003-12-11 | Mesophotonics Limited | Optical delay device |
| US20040227687A1 (en) * | 2003-05-15 | 2004-11-18 | Delgado Heriberto Jose | Passive magnetic radome |
| US20040239577A1 (en) * | 2003-05-30 | 2004-12-02 | Delgado Heriberto Jose | Efficient radome structures of variable geometry |
| 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 |
| US20090034900A1 (en) * | 2007-08-03 | 2009-02-05 | Murata Manufacturing Co., Ltd. | Band-pass filter and method for making photonic crystal for the band-pass filter |
| 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 |
-
2013
- 2013-04-18 CN CN201310135617.XA patent/CN103219572B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030228096A1 (en) * | 1997-05-16 | 2003-12-11 | Mesophotonics Limited | Optical delay device |
| CN1784810A (en) * | 2003-03-31 | 2006-06-07 | 哈里公司 | Arrangements of microstrip antennas having dielectric substrates including meta-materials |
| US20040227687A1 (en) * | 2003-05-15 | 2004-11-18 | Delgado Heriberto Jose | Passive magnetic radome |
| US20040239577A1 (en) * | 2003-05-30 | 2004-12-02 | Delgado Heriberto Jose | Efficient radome structures of variable geometry |
| 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 |
| US20090034900A1 (en) * | 2007-08-03 | 2009-02-05 | Murata Manufacturing Co., Ltd. | Band-pass filter and method for making photonic crystal for the 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104377453A (en) * | 2014-12-09 | 2015-02-25 | 南京大学 | Frequency-adjustable directed-radiation antenna |
| CN105846115A (en) * | 2016-04-07 | 2016-08-10 | 南京大学 | Pattern-reconfigurable 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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| CN103219572B (en) | 2015-10-28 |
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