CN103682532A - Electromagnetic wave multi-band filter with side micro-cavities and metal-medium-metal waveguide coupled - Google Patents
Electromagnetic wave multi-band filter with side micro-cavities and metal-medium-metal waveguide coupled Download PDFInfo
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Abstract
The invention relates to an electromagnetic wave multi-band filter with side micro-cavities and a metal-medium-metal waveguide coupled, and belongs to the technical field of filter design. According to the electromagnetic wave multi-band filter, the metal-medium-metal structure is used, the middle medium part is an insulating transparent layer and the waveguide is formed; multiple sets of side micro-cavities are manufactured in the metal parts and each set of side micro-cavities corresponds to a rectangular transmission stop band. Particularly, due to the fact that gold is very few in loss in the terahertz wave band, gold can be seen as an ideal electric conductor; the bandwidth of the filter can be adjusted by adjusting the width of the micro-cavities; multi-band filtering of the terahertz wave band can be realized. The electromagnetic wave multi-band filter has the advantages that the bandwidth and the number of the stop bands are adjustable; minimization and integration can be achieved conveniently; the electromagnetic wave multi-band filter can also be applied to other electromagnetic frequency bands such as the optical fiber communication frequency band and the microwave frequency band, and the requirements of different frequency bands can be met.
Description
Technical field
The electromagnetic wave multi-band filter that the present invention relates to a kind of side microcavity and metal-dielectric-metal waveguide coupling, belongs to design of filter technical field.
Background technology
Terahertz emission be frequency in the electromagnetic radiation of 0.1～10THz, there is penetration capacity strong, the advantage such as photon energy is low, and frequency spectrum is wide, makes it in fields such as the nondestructive inspection of safety inspection, material and structure, radio communications, have potential application.The transmission of THz wave is an important component part in THz wave communication systems, and in communication system, filter is pith.At present, the terahertz filter structure of research mainly contains following several both at home and abroad: (1) terahertz filter based on super material; (2) terahertz filter based on 1-D photon crystal structure; (3) terahertz filter based on two-dimensional medium photonic crystal.Due to these terahertz filter complex structures, be difficult to extensive use.Therefore it is vital, pursuing a kind of terahertz filter simple in structure, that size is small.In current material, High Resistivity Si, high density polyethylene (HDPE), high conductivity metal (gold, silver, copper) are negligible to the electromagnetic absorption loss of terahertz wave band.Therefore utilizing these design of materials to go out terahertz filter is in Terahertz application system, to be badly in need of the key technical problem of solution.
In addition,, along with the development of Fibre Optical Communication Technology, optical filter product is applied on a large scale.It can be selected for wavelength, the noise filtering of image intensifer, gain balance, recovery with and demultiplexing etc.Common communication band filter has following two classes: (1) filter based on principle of interference, as Fabry-Perot filter, multilayer thin-film-filter, Mach-Zehnder interference filter; (2) filter based on grating principle, as grating filter, array waveguide grating filter, acousto-optic tunable filter.Therefore, if can realize same device architecture, at different frequency range, all can realize filter function, will be a significant benefit to the processing of device and integrated etc.
Summary of the invention
The object of the invention is, for solving multiband electromagnetic wave filtering problem, and the electromagnetic wave multi-band filter of a kind of side microcavity providing and metal-dielectric-metal waveguide coupling.
Described multi-band filter is metal-dielectric-metal structure, and intermediate medium is partly insulation transparent layer, forms waveguide; Both sides metal is partly made many group side microcavitys, every group of corresponding rectangular transmission stopband of side microcavity.Phase difference in two adjacent groups side microcavity between two side microcavitys of arest neighbors is π.
Every group of side microcavity comprises three parallel contour wide microcavitys, and three microcavitys are arranged in homonymy metal.Microcavity height determines microcavity eigenfrequency, and between adjacent microcavity, to make phase difference between adjacent microcavity be pi/2 to distance.The width of three microcavitys determines resistance band corresponding to this group side microcavity, and it highly determines the transmission stopband center position of this group side microcavity and the interval of two adjacent rectangle transmission stopbands.In every group of side microcavity, the eigenfrequency of each side microcavity is identical, and each eigenfrequency of organizing side microcavity is different.
If terahertz wave band, is communicated with between side microcavity and waveguide; If communication band, is not communicated with between side microcavity and waveguide, by Metal Phase every.
The bandwidth of filter depends on the stiffness of coupling between microcavity and waveguide, and stiffness of coupling changes by adjusting the width of microcavity or the distance between microcavity and waveguide.Design thus the electromagnetic multi-band filter of the multiple frequency range of the tunable adaptation of bandwidth.
Beneficial effect
The present invention utilizes metal-dielectric-metal structure as terahertz waveguide, because gold is very little in the loss of terahertz wave band, can be considered desired electrical conductor; Can adjust by adjusting the width of microcavity the bandwidth of filter; Can realize the multi-band filtering of terahertz wave band.There is bandwidth, stopband number is adjustable; Be convenient to miniaturization and integrated; Also can be applied to other electromagnetic wave frequency range, such as optical-fibre communications frequency range, microwave band etc., meet different-waveband demand.
Accompanying drawing explanation
Fig. 1 is the Terahertz dual-attenuation filter construction schematic diagram based on side microcavity and the coupling of metal-dielectric-metal waveguide in specific embodiment;
Fig. 2 is the transmission spectrum of Terahertz dual-attenuation filter in specific embodiment;
Fig. 3 is the distribution map of the electric field of Terahertz dual-attenuation filter when incident wave wavelength is 0.6mm in specific embodiment, shows that the electromagnetic wave of 0.6mm wavelength cannot see through this structure;
Fig. 4 is the distribution map of the electric field of Terahertz dual-attenuation filter when incident wave wavelength is 0.8mm in specific embodiment, shows that the electromagnetic wave of 0.8mm wavelength also cannot see through this structure;
Fig. 5 is the communication band three stop-band filter structural representations based on side microcavity and the coupling of metal-dielectric-metal waveguide in specific embodiment;
Fig. 6 is the transmission spectrum of communication band three stop-band filters in specific embodiment;
Fig. 7 is the distribution map of the electric field of communication band three stop-band filters when incident wave wavelength is 1.49 μ m, and its electromagnetic wave that shows 1.49 mum wavelengths cannot see through this structure;
Fig. 8 is the distribution map of the electric field of communication band three stop-band filters when incident wave wavelength is 1.55 μ m, and its electromagnetic wave that shows 1.55 mum wavelengths cannot see through this structure;
Fig. 9 is the distribution map of the electric field of communication band three stop-band filters when incident wave wavelength is 1.61 μ m, and its electromagnetic wave that shows 1.61 mum wavelengths cannot see through this structure.
Embodiment
In order better to illustrate, be described further objects and advantages of the present invention below in conjunction with drawings and Examples.
In conjunction with Fig. 1 explanation, the from left to right incident of Terahertz wave source, metal material adopts the gold of high conductivity, and waveguide medium is air; In figure, grey color part represents metal (gold), and blank space represents medium (air), and all side microcavitys are atrium, are directly connected with waveguide.System structure parameter is set to: duct width t
w=100 μ m, the width of first group of side microcavity (in Fig. 1, the left side is three) is t
1=15 μ m are highly h
1=138 μ m, between adjacent microcavity, distance is l
1=150 μ m; The width of second group of coupled micro-cavity (in Fig. 1, the right is three) is t
1=10 μ m are highly h
2=191 μ m, the distance between microcavity that is connected is l
2=200 μ m; Between two groups of microcavitys, distance is d=500 μ m.
According to the device of Fig. 1 example design at the transmission spectrum of terahertz wave band as shown in Figure 2,, two stopband center are set at respectively 0.6mm and 0.8mm place.
Terahertz dual-attenuation filter, when incident electromagnetic wave wavelength is λ=0.6mm, is stopped by first group of side microcavity from the electromagnetic wave of left side incident, as shown in Figure 3.When the wavelength of incident electromagnetic wave is λ=0.8mm, electromagnetic wave stopped by second group of side microcavity, as shown in Figure 4.Two kinds of situations all show, corresponding wavelength electromagnetic wave cannot see through this structure, thereby form transmission stopband, realize the filtering of many stopbands.
In conjunction with Fig. 5 explanation, the from left to right incident of communication wave-wave source, waveguide medium is air.In figure, grey color part represents metal (gold), and blank space represents medium (air), and all side microcavitys are the chamber of remaining silent, and has certain distance with waveguide.System structure parameter is set to: duct width is t
w=0.2 μ m, is not communicated with between all microcavitys and waveguide, and its standoff distance is 0.015 μ m; The width of first group of microcavity (in Fig. 3, the left side is three) is t
1=0.2 μ m is highly h
1=0.628 μ m, between adjacent microcavity, distance is l
1=0.339 μ m; The width of second group of microcavity (middle three of Fig. 3) is t
2=0.2 μ m is highly h
2=0.65 μ m, between adjacent microcavity, distance is l
2=0.351 μ m; The width of the 3rd group of microcavity (in Fig. 3, the right is three) is t
3=0.2 μ m is highly h
3=0.672 μ m, between adjacent microcavity, distance is l
3=0.363 μ m; Between first group and second group of microcavity, distance is d
1=0.69 μ m, between second group and the 3rd group of microcavity, distance is d
3=0.714 μ m.
According to the device of Fig. 5 example design at the transmission spectrum of communication band as shown in Figure 6, three stopband center are set at respectively wavelength 1.49 μ m, 1.55 μ m and 1.61 μ m places.
Communication band three stop-band filters are when incident electromagnetic wave wavelength is λ=1.49 μ m, and incident electromagnetic wave stopped by one group of side microcavity, as shown in Figure 7.When incident electromagnetic wave wavelength is λ=1.55 μ m, incident electromagnetic wave stopped by second group of side microcavity, as shown in Figure 8.When incident electromagnetic wave wavelength is λ=1.61 μ m, incident electromagnetic wave stopped by the 3rd group of side microcavity, as shown in Figure 9.Three kinds of situations all show, the electromagnetic wave of corresponding wavelength cannot see through this structure, thereby form transmission stopband, realize the filtering of many stopbands.
Claims (3)
1. the electromagnetic wave multi-band filter of side microcavity and metal-dielectric-metal waveguide coupling, is characterized in that: be metal-dielectric-metal structure, intermediate medium is partly insulation transparent layer, forms waveguide; Both sides metal is partly made many group side microcavitys, every group of corresponding rectangular transmission stopband of side microcavity; Phase difference in two adjacent groups side microcavity between two side microcavitys of arest neighbors is π;
Every group of side microcavity comprises three parallel contour wide microcavitys, and three microcavitys are arranged in homonymy metal; In every group between adjacent microcavity distance to make phase difference between adjacent microcavity be pi/2; The width of three microcavitys determines resistance band corresponding to this group side microcavity, and it highly determines the interval of eigenfrequency, transmission stopband center position and two adjacent rectangle transmission stopbands of this group side microcavity;
The bandwidth of filter depends on the stiffness of coupling between microcavity and waveguide, and stiffness of coupling changes by adjusting the width of microcavity or the distance between microcavity and waveguide; Design thus the electromagnetic multi-band filter of the multiple frequency range of the tunable adaptation of bandwidth.
2. the electromagnetic wave multi-band filter of side microcavity according to claim 1 and metal-dielectric-metal waveguide coupling, is characterized in that: if terahertz wave band is communicated with between side microcavity and waveguide; If communication band, is not communicated with between side microcavity and waveguide, by Metal Phase every.
3. the electromagnetic wave multi-band filter of side microcavity according to claim 1 and metal-dielectric-metal waveguide coupling, is characterized in that: in every group of side microcavity, the eigenfrequency of each side microcavity is identical, and each eigenfrequency of organizing side microcavity is different.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985925A (en) * | 2014-05-04 | 2014-08-13 | 上海理工大学 | Terahertz wave band elimination filter filtering passageway number control method |
| CN104241746A (en) * | 2014-09-09 | 2014-12-24 | 江苏贝孚德通讯科技股份有限公司 | Waveguide high-frequency low-pass filter |
| CN104834058A (en) * | 2015-04-30 | 2015-08-12 | 深圳大学 | Low-loss small mode field terahertz waveguide |
| CN106299564A (en) * | 2016-10-27 | 2017-01-04 | 桂林电子科技大学 | Plasma curved waveguide wave filter based on microcavity coupled structure |
| CN107064052A (en) * | 2017-04-26 | 2017-08-18 | 中国计量大学 | A kind of Terahertz fingerprint detection sensitivity Enhancement Method based on microcavity mode of resonance |
| CN110311290A (en) * | 2019-07-17 | 2019-10-08 | 重庆邮电大学 | A kind of Terahertz multifrequency linear frequency converter based on photosensitive silicon |
| CN114497933A (en) * | 2022-01-07 | 2022-05-13 | 哈尔滨工业大学 | Adjustable band-stop filter with plasma-coated double-tooth-shaped structure |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103985925A (en) * | 2014-05-04 | 2014-08-13 | 上海理工大学 | Terahertz wave band elimination filter filtering passageway number control method |
| CN104241746A (en) * | 2014-09-09 | 2014-12-24 | 江苏贝孚德通讯科技股份有限公司 | Waveguide high-frequency low-pass filter |
| CN104834058A (en) * | 2015-04-30 | 2015-08-12 | 深圳大学 | Low-loss small mode field terahertz waveguide |
| CN104834058B (en) * | 2015-04-30 | 2018-07-10 | 深圳大学 | A kind of low-loss, small mould field terahertz waveguide |
| CN106299564A (en) * | 2016-10-27 | 2017-01-04 | 桂林电子科技大学 | Plasma curved waveguide wave filter based on microcavity coupled structure |
| CN106299564B (en) * | 2016-10-27 | 2018-10-19 | 桂林电子科技大学 | Plasma curved waveguide filter based on microcavity coupled structure |
| CN107064052A (en) * | 2017-04-26 | 2017-08-18 | 中国计量大学 | A kind of Terahertz fingerprint detection sensitivity Enhancement Method based on microcavity mode of resonance |
| CN110311290A (en) * | 2019-07-17 | 2019-10-08 | 重庆邮电大学 | A kind of Terahertz multifrequency linear frequency converter based on photosensitive silicon |
| CN114497933A (en) * | 2022-01-07 | 2022-05-13 | 哈尔滨工业大学 | Adjustable band-stop filter with plasma-coated double-tooth-shaped structure |
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