CN104157934B - A kind of ultra broadband artificial surface plasma wave filter - Google Patents
A kind of ultra broadband artificial surface plasma wave filter Download PDFInfo
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- CN104157934B CN104157934B CN201410348649.2A CN201410348649A CN104157934B CN 104157934 B CN104157934 B CN 104157934B CN 201410348649 A CN201410348649 A CN 201410348649A CN 104157934 B CN104157934 B CN 104157934B
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Abstract
The invention provides a kind of ultra broadband artificial surface plasma wave filter, comprise the coaxial waveguide of two ends symmetry, coaxial waveguide is to transition waceguide and the middle column type plasma waveguide of column type plasma waveguide; Wherein, transition waceguide comprises inner wire and outer conductor transition, and the periodicity ring groove array that inner conductor transition is changed by radius and the degree of depth is simultaneously realized, and the electromagnetic horn that outer conductor transition is gradually changed with curve by opening is realized; Column type plasma waveguide is made up of radius and the constant periodicity ring groove array of the degree of depth. The present invention has open symmetrical structure, compact dimensions, broadband, high-performance, simple in structure, especially be applicable to mating use with traditional microwave or Terahertz transmission line, can be used as a kind of novel wide-band plasma wave filter and use, for the design and application of wave filter provides a kind of brand-new thinking and scheme.
Description
Technical field
The present invention relates to a kind of filter construction, relate in particular to a kind of ultra broadband artificial surface plasma filter construction.
Background technology
Surface plasmons (SurfacePlasmonPolaritons is called for short SPPs) is in light and metal surfaceCaused a kind of mode of electromagnetic wave under free electron interacts. In this interaction, free electron with its resonanceUnder the irradiation of the light wave that frequency is identical, collective oscillation occurs, it is confined near metal and medium interface, propagates along surface. Due toThe plasma frequency of metal is generally all at ultraviolet band, and in microwave section, electromagnetic wave is difficult to infiltration, and metal is approximate to be shown as ideal and leadBody (PEC). In these cases, although metal surface can be propagated SPPs in principle, the pact of its field in mediumRestraint very poor. In recent years, someone proposes to increase electromagnetic field at intrametallic osmotic energy in the method for metal surface borehole or cuttingPower, thus can carry out engineering design to SPPs at lower frequency. This plasma frequency is subject to surface geometry controlSurface plasma is called as artificial surface plasma, and (SpoofSurfacePlasmonPolaritons is called for shortSSPPs), first it proposed in 2004 by people such as Pendry, and be applied at lower frequency SPPs is carried out to engineering design. ItsBasic thought is the hole that digs period profile in metal surface, and the size of hole and interval are all less than wavelength, to strengthen electromagnetic waveOsmosis, thereby reduced the plasma frequency of metal surface by the means of effective medium. 2005, Hibbins etc.People has confirmed SSPPs phenomenon in microwave section, and SSPPs has caused researcher's very big interest since then.
In general, metal is approximately perfact conductor in low-frequency range (microwave section), therefore be to propagate SPPs on its surface, but had after the hole of period profile, SPPs not only can be propagated in surface, can also realize the sub-wavelength constraint of field, andPeriodically the plasma frequency of sub-wavelength structure can change flexibly by the physical dimension that changes sub-wavelength structure. Light at presentSliding metal wire is considered to one of best terahertz waveguide, and its guided wave is based on normal SPPs mechanism. This guided wave toolThere is the advantage of low-loss and low dispersion, but retrain poor. Therefore, 2006, the people such as Maier were generalized to the concept of SSPPsHow much position shapes of metal wire upper, proved in theory to carve along its length the ring-like recessed of periodic distribution on ideal wireGroove, can transmit SSPPs and realize the sub-wavelength constraint of field. Compare smooth metal line, above-mentioned metal wire structure can realize micro-Ripple or THz wave highly constrained.
All the time, spatial ripple is extensively studied to the conversion of SPPs, as passed through prism-coupled or diffraction grating.But study very few to the conversion of SSPPs for guided wave. 2013, Southeast China University proposed one and has realized guided wave at microwave frequency bandArrive the structure of the efficient conversion of SSPPs, it is by traditional co-planar waveguide (coplanarwaveguide is called for short CPW) and " toothType " plasma waveguide forms, and designed the matching transition band of gash depth gradual change between the two. Matching transition part has realizedThe wave vector coupling of CPW and plasma waveguide and impedance matching, this structure has realized from guided wave to SpoofSPPs in microwave sectionHigh efficiency and wide-band conversion are the integrated application prospect of having started of the height of plasma function element in microwave circuit. But,Consider the electromagnetic field form of transmitting in ultra-thin " tooth type " plasma waveguide, for other conventional waveguide, as coaxial waveguide,Such scheme will be no longer applicable.
Summary of the invention
Technical problem: technical problem to be solved by this invention is for relating to " tooth type " plasma in background technologyWaveguiding structure can not be realized the defect of the Efficient Conversion function between coaxial waveguide, and a kind of symmetry simple in structure, size are providedCompact, be easy to the Novel coaxial waveguide that traditional microwave transmission line is used in conjunction with, performance is good to the conversion of column type plasma waveguideDevice, filters as a kind of novel wide-band plasma to the basis of the efficient of SSPPs and broadband conversion at implementation space guided waveRipple device uses, and the design and application that can be wave filter provides a kind of brand-new thinking and scheme.
In order to achieve the above object, technical scheme of the present invention is achieved in that
A kind of ultra broadband artificial surface plasma wave filter, is characterized in that: comprise the coaxial waveguide of two ends symmetry and withAxle waveguide is to the transition waceguide of column type plasma waveguide, and middle column type plasma waveguide;
Wherein, transition waceguide comprises inner wire and outer conductor transition, and inner conductor transition is changed by radius and the degree of depth simultaneouslyPeriodically ring groove array is realized, and the electromagnetic horn that outer conductor transition is gradually changed with curve by opening is realized; Column type etc.Ion waveguide is made up of radius and the constant periodicity ring groove array of the degree of depth.
The present invention can regulate transition waceguide and column type plasma waveguide according to the type of coaxial waveguide and sizePhysical dimension, realizes the conversion to SSPPs of microwave section or terahertz wave band space guided wave, and then completes the super wide of plasma waveguideBand filter function, thus microwave or Terahertz frequency range to the design and application of the super material devices of plasma provide a kind of completely newlyThinking and scheme.
The present invention has following beneficial effect:
1. the present invention mainly proposes one based on traditional coaxial waveguide to the thought of the Efficient Conversion of column type plasma waveguidePlant ultra broadband artificial surface plasma wave filter, especially in conjunction with in guided wave in coaxial waveguide and column type plasma waveguideThe transmission form of SSPPs is designed and is realized the novel transition structure of coaxial waveguide to the Efficient Conversion of plasma waveguide, for realizingThe application that guided wave transforms to artificial SPPs has solved a critical difficult problem, has also solved a difficult problem for real experiment test simultaneously, forThe design and application of the super material devices of plasma opens prospect more widely.
2. the present invention has bilateral coaxial waveguide interface surface, supports symmetrical input/output structure design, and this hybridization waveguide existsIn structure, comprise medianly zygomorphic coaxial waveguide, the column type etc. that centre is the etching ring groove that the constant cycle changes fromWavelet is led and is connected the transition structure of coaxial waveguide and column type plasma waveguide. This waveguide is to SSPPs based on guided waveThe design philosophy of Efficient Conversion, proposed to utilize the ring groove structure that radius and the degree of depth change simultaneously to realize coaxial waveguideWith wave number between column type plasma waveguide coupling and outer conductor adopt and realize coaxially with the electromagnetic horn of curve gradual changeImpedance matching between waveguide and column type plasma waveguide. This stereochemical structure can realize the efficient of signal and symmetrical input andThe way of output and there is greater flexibility in the design of High-Power Microwave device and integrated circuit structure.
3. strong innovation, technology is perspective good: this ultra broadband artificial surface plasma filter construction, real at microwave frequency bandShowed electromagnetic strong locality and high efficiency of transmission, strong innovation, has no this type of filter structure both at home and abroad; It can well be withTraditional microwave transmission line is used in conjunction with, and can be applicable to terahertz wave band, has expanded the application of cylindrical plasma transmission lineScope, has good technology perspective.
4. high, the bandwidth of efficiency; The present invention finally can realize the efficient of artificial surface plasma device and ultra broadband filterWave energy. Within the scope of 1～7GHz, S11 all-below 10dB, be all greater than-3dB of S21, in the time of f=5GHz, S21 reaches as high asTo-0.4dB, thus realize the efficient and broadband transmission of signal in the super material of artificial surface plasma, and plasmaThe function of the ultra broadband filtering of super material to signal.
Brief description of the drawings:
Fig. 1 is the front view of embodiment mono-;
Fig. 2 (a) is the structural profile front view of embodiment bis-;
Fig. 2 (b) is the left view of the coaxial waveguide part of embodiment bis-;
Fig. 2 (c) is the inner and outer conductor figure of the transition portion of embodiment bis-;
Fig. 2 (d) is the column type plasma waveguide figure of embodiment bis-;
Fig. 3 is that embodiment bis-depths of groove of transition waceguide ring groove array and the variation of radius are to its dispersion characteristicsInfluence curve figure;
Fig. 4 is the S parameter design sketch of embodiment bis-.
Specific embodiments:
Below in conjunction with accompanying drawing, the enforcement of technical scheme is described in further detail:
Embodiment mono-
As shown in Fig. 2 (a), wave filter by medianly zygomorphic coaxial waveguide and coaxial waveguide to column type plasma waveThe column type plasma waveguide composition of the transition waceguide of leading and middle constant cycle. Transition waceguide comprises inner wire and outer conductorTransition, the periodicity ring groove array that inner conductor transition is changed by radius and the degree of depth is simultaneously realized, and outer conductor transition is by openingThe electromagnetic horn gradually changing with curve is realized; Column type plasma waveguide is by radius and the constant periodicity ring groove of the degree of depthArray composition. The parameters of structural dimension of transition waceguide and column type plasma waveguide is adjusted according to the type of coaxial waveguide and sizeJoint, matches with coaxial waveguide parameter (as waveguide type, waveguide length, waveguide cross-section size etc.).
Embodiment bis-
Taking coaxial waveguide as shown in Fig. 2 (b) as example, region I is medianly zygomorphic coaxial waveguide, single overall length l1＝10 millimeters, waveguide inner conductor outer diameter 2R1=7 millimeters, outer conductor internal diameter 2R2=16 millimeters, wall thickness t=1 millimeter. Converter two endsCoaxial waveguide all can be used as the input/output terminal of guided wave signals, when one of them coaxial waveguide is during as input, anotherOn-axis wave directive/guide is output.
Medianly zygomorphic transition waceguide is connected with the coaxial waveguide of homonymy respectively, plays signal is converted into efficientlyThe effect of SSPPs signal. As shown in Fig. 2 (c), transition waceguide region II comprises inner wire and outer conductor transition. Inner conductor transitionRing groove array adopt at the beginning radius from r1＝R1=3.5 millimeters are incremented to r by constant step number Δ r=0.5 millimeter2＝R3=7.5 millimeters, meanwhile, depth of groove is from h1=0.5 millimeter according to constant step size Δ h1=0.5 millimeter is incremented to h2=4.5 millisRice; Then keep radius r2=7.5 millimeters constant, adopts the degree of depth from h2=4.5 millimeters according to constant step size Δ h2=0.5 millimeterBe incremented to h3=6 millimeters, the remainder of ring groove array keeps the final radius r of gradual change2=7.5 millimeters and degree of depth h3＝6Millimeter; The horizontal cycle distance of adjacent two grooves of ring groove array is d=3 millimeter, and groove width is a=1 millimeter, is used forRealize the wave number coupling between coaxial waveguide and column type plasma waveguide, the variation of the ring groove degree of depth and radius is to its dispersionThe impact of characteristic as shown in Figure 3. In the present embodiment, the electromagnetic horn of outer conductor is according to formulaRealize gradual change, wherein, (x1,y1)＝(l1,R2) and (x2,y2)＝(l1+l2,R2+ Δ H) be respectively the starting point of curve and terminal (byIn two ends, left and right symmetry, herein only taking left end electromagnetic horn as example), Δ H > 0, utilize the optimization of Electromagnetic Simulation software to obtainOne group of Optimal Parameters α=0.04, Δ H=25 millimeter, now wave filter can reach preferably performance, and the wall thickness of electromagnetic horn is t=1 millimeter remains unchanged, and matches with coaxial waveguide wall thickness. The horizontal cycle spacing of adjacent two ring grooves in transition waceguideD=3 millimeter, the total length of monolateral transition waceguide is l2=68 millimeters. Electromagnetic horn is used for realizing coaxial waveguide and column type etc.Impedance matching between ion waveguide, curve equation and the design parameter of electromagnetic horn are not limited to the present embodiment.
The column type plasma waveguide of middle constant cycle is as the carrier of the SSPPs signal transmission of corresponding frequency band. As Fig. 2(d), shown in, the column type plasma waveguide of mid portion region III is r by conductor radius2＝R3=7.5 millimeters, recess widthFor a=1 millimeter, degree of depth h3=6 millimeters, the ring groove array group of the horizontal cycle spacing d=3 millimeter of adjacent two groovesBecome length l3=84 millimeters. This embodiment converter total length is 240 millimeters.
According to embodiment bis-, utilize Electromagnetic Simulation software can obtain efficient performance as shown in Figure 4, in 1～7GHz scopeIn, S11 all-below 10dB, be all greater than-3dB of S21, in the time of f=5GHz, can reach-0.4dB of S21, thus realizedEfficient and the broadband transmission of signal in the super material of artificial surface plasma, and the ultra broadband of the super material of plasma to signalThe function of filtering.
Claims (5)
1. a ultra broadband artificial surface plasma wave filter, is characterized in that: comprise and be positioned at the middle cylinder of described wave filterType plasma waveguide, is positioned at two coaxial waveguides at described wave filter two ends, and described two coaxial waveguides are divided and are clipped to column typeTwo transition waceguides of plasma waveguide, and two coaxial waveguides and two transition waceguides are all two ends pair about described wave filterClaim; Wherein, transition waceguide comprises inner conductor transition and outer conductor transition, and inner conductor transition is by towards column type plasma waveguide directionPeriodicity ring groove array that radius and the degree of depth change is simultaneously realized, and outer conductor transition is by towards column type plasma waveguide directionThe electromagnetic horn that opening gradually changes with curve is realized; Column type plasma waveguide is ring-like by radius and the constant periodicity of the degree of depthGroove array composition; In transition waceguide, inner conductor transition is connected with column type plasma waveguide.
2. a kind of ultra broadband artificial surface plasma wave filter according to claim 1, is characterized in that: transition waceguideIn, the ring groove array of inner conductor transition adopts radius from r at the beginning1Be incremented to r by constant step number △ r2, meanwhile, groove is darkDegree is from h1According to constant step size △ h1Be incremented to h2; Then keep radius r2Constant, adopt the degree of depth from h2According to constant step size △ h2Be incremented to h3, the remainder of ring groove array keeps the final radius r of gradual change2With degree of depth h3; Ring groove array adjacent twoThe horizontal cycle distance of individual groove is d, the single total length l of transition waceguide2, parameter r1、△r、r2、h1、△h1、h2、△h2、h3、d、l2Match with coaxial waveguide parameter size.
3. a kind of ultra broadband artificial surface plasma wave filter according to claim 1 and 2, is characterized in that: transition rippleIn leading, the electromagnetic horn gradual change of outer conductor transition is according to formulaRealize gradual change,Wherein, (x1,y1) and (x2,y2) being respectively starting point and the terminal of curve, the wall thickness of electromagnetic horn is that t remains unchanged, parameter alpha, tMatch with coaxial waveguide parameter size.
4. a kind of ultra broadband artificial surface plasma wave filter according to claim 1 and 2, is characterized in that: column typePlasma waveguide is d by the horizontal cycle distance of adjacent two ring grooves, and recess width is a, and the degree of depth is h3Ring grooveArray composition, total length is l3, parameter d, a, h3、l3Match with coaxial waveguide parameter size.
5. a kind of ultra broadband artificial surface plasma wave filter according to claim 1, is characterized in that: any one endCoaxial waveguide is as the input/output of guided wave signals, and the on-axis wave directive/guide of the other end is output/input.
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| CN104577270B (en) * | 2015-01-21 | 2017-03-22 | 东南大学 | Broadband filter based on frequency selective surface plasmon |
| CN104701590B (en) * | 2015-03-24 | 2017-09-26 | 南京航空航天大学 | A kind of Wideband surface plasma bandpass filter |
| CN104852254B (en) * | 2015-04-13 | 2018-03-20 | 东南大学 | A kind of wideband surface phasmon radiator |
| CN109473757B (en) * | 2015-07-30 | 2020-03-10 | 上海理工大学 | Broadband transmission line chip |
| CN105261841A (en) * | 2015-09-16 | 2016-01-20 | 东南大学 | Quasi-surface plasmon-based leaky-wave antenna |
| CN105489974A (en) * | 2015-12-16 | 2016-04-13 | 中国电子科技集团公司第四十一研究所 | Ultra wide band coaxial coupling probe structure based on high-order elliptic function curve |
| CN105703048B (en) * | 2016-01-13 | 2018-07-13 | 北京大学 | A kind of ultra wide band Terahertz class surface plasma excimer coupler and coupling process |
| CN105789790A (en) * | 2016-04-27 | 2016-07-20 | 六盘水师范学院 | Spoof surface plasmon polaritons (SSPPs) type microwave band-pass filter |
| CN109935972B (en) * | 2019-01-25 | 2021-01-26 | 南通大学 | Broadband antenna based on plasmon |
| CN111106441A (en) * | 2020-01-09 | 2020-05-05 | 西安理工大学 | Miniaturized directional radiation antenna based on artificial surface plasmon polariton |
| CN114280725B (en) * | 2021-12-06 | 2023-07-04 | 电子科技大学长三角研究院(湖州) | Terahertz on-chip dynamic transmission structure based on coupling type surface plasmon imitation |
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| US6501783B1 (en) * | 2000-02-24 | 2002-12-31 | Lucent Technologies Inc. | Distributed feedback surface plasmon laser |
| US8837036B2 (en) * | 2010-07-23 | 2014-09-16 | Pinaki Mazumder | Dynamic terahertz switch using periodic corrugated structures |
| CN102255121A (en) * | 2011-05-11 | 2011-11-23 | 东南大学 | Broadband slow wave system based on cylindrical line waveguide excitation |
| CN202281747U (en) * | 2011-11-07 | 2012-06-20 | 上海工程技术大学 | Plasma resonance sensing device |
| CN102737713B (en) * | 2012-07-09 | 2015-08-12 | 哈尔滨工程大学 | Based on the two-dimentional integrated form optical fiber on-line memory of linear array multi-core fiber |
| CN102768386B (en) * | 2012-07-09 | 2014-08-06 | 哈尔滨工程大学 | Micro-nano fiber downloading filter based on rainbow local effect |
| CN102768837A (en) * | 2012-07-09 | 2012-11-07 | 哈尔滨工程大学 | Optical fibre online storage based on rainbow local effect |
| CN103308985B (en) * | 2013-06-17 | 2015-04-22 | 上海理工大学 | Terahertz dual-wavelength division multiplexing/demultiplexing device |
| CN103531876A (en) * | 2013-10-25 | 2014-01-22 | 东南大学 | Efficient transmission line of surface plasmon |
| CN203553320U (en) * | 2013-10-25 | 2014-04-16 | 东南大学 | Efficient surface plasma element transmission line |
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